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/* -*- mode: asm -*-
**
** head.S -- This file contains the initial boot code for the
**           Linux/68k kernel.
**
** Copyright 1993 by Hamish Macdonald
**
** 68040 fixes by Michael Rausch
** 68060 fixes by Roman Hodek
** MMU cleanup by Randy Thelen
** Final MMU cleanup by Roman Zippel
**
** Atari support by Andreas Schwab, using ideas of Robert de Vries
** and Bjoern Brauel
** VME Support by Richard Hirst
**
** 94/11/14 Andreas Schwab: put kernel at PAGESIZE
** 94/11/18 Andreas Schwab: remove identity mapping of STRAM for Atari
** ++ Bjoern & Roman: ATARI-68040 support for the Medusa
** 95/11/18 Richard Hirst: Added MVME166 support
** 96/04/26 Guenther Kelleter: fixed identity mapping for Falcon with
**                            Magnum- and FX-alternate ram
** 98/04/25 Phil Blundell: added HP300 support
** 1998/08/30 David Kilzer: Added support for fbcon_font_desc structures
**            for linux-2.1.115
** 9/02/11  Richard Zidlicky: added Q40 support (initial vesion 99/01/01)
**
** This file is subject to the terms and conditions of the GNU General Public
** License. See the file README.legal in the main directory of this archive
** for more details.
**
*/
 
/*
 * Linux startup code.
 *
 * At this point, the boot loader has:
 * Disabled interrupts
 * Disabled caches
 * Put us in supervisor state.
 *
 * The kernel setup code takes the following steps:
 * .  Raise interrupt level
 * .  Set up initial kernel memory mapping.
 *    .  This sets up a mapping of the 4M of memory the kernel is located in.
 *    .  It also does a mapping of any initial machine specific areas.
 * .  Enable the MMU
 * .  Enable cache memories
 * .  Jump to kernel startup
 *
 * Much of the file restructuring was to accomplish:
 * 1) Remove register dependency through-out the file.
 * 2) Increase use of subroutines to perform functions
 * 3) Increase readability of the code
 *
 * Of course, readability is a subjective issue, so it will never be
 * argued that that goal was accomplished.  It was merely a goal.
 * A key way to help make code more readable is to give good
 * documentation.  So, the first thing you will find is exaustive
 * write-ups on the structure of the file, and the features of the
 * functional subroutines.
 *
 * General Structure:
 * ------------------
 *      Without a doubt the single largest chunk of head.S is spent
 * mapping the kernel and I/O physical space into the logical range
 * for the kernel.
 *      There are new subroutines and data structures to make MMU
 * support cleaner and easier to understand.
 *      First, you will find a routine call "mmu_map" which maps
 * a logical to a physical region for some length given a cache
 * type on behalf of the caller.  This routine makes writing the
 * actual per-machine specific code very simple.
 *      A central part of the code, but not a subroutine in itself,
 * is the mmu_init code which is broken down into mapping the kernel
 * (the same for all machines) and mapping machine-specific I/O
 * regions.
 *      Also, there will be a description of engaging the MMU and
 * caches.
 *      You will notice that there is a chunk of code which
 * can emit the entire MMU mapping of the machine.  This is present
 * only in debug modes and can be very helpful.
 *      Further, there is a new console driver in head.S that is
 * also only engaged in debug mode.  Currently, it's only supported
 * on the Macintosh class of machines.  However, it is hoped that
 * others will plug-in support for specific machines.
 *
 * ######################################################################
 *
 * mmu_map
 * -------
 *      mmu_map was written for two key reasons.  First, it was clear
 * that it was very difficult to read the previous code for mapping
 * regions of memory.  Second, the Macintosh required such extensive
 * memory allocations that it didn't make sense to propogate the
 * existing code any further.
 *      mmu_map requires some parameters:
 *
 *      mmu_map (logical, physical, length, cache_type)
 *
 *      While this essentially describes the function in the abstract, you'll
 * find more indepth description of other parameters at the implementation site.
 *
 * mmu_get_root_table_entry
 * ------------------------
 * mmu_get_ptr_table_entry
 * -----------------------
 * mmu_get_page_table_entry
 * ------------------------
 *
 *      These routines are used by other mmu routines to get a pointer into
 * a table, if necessary a new table is allocated. These routines are working
 * basically like pmd_alloc() and pte_alloc() in . The root
 * table needs of course only to be allocated once in mmu_get_root_table_entry,
 * so that here also some mmu specific initialization is done. The second page
 * at the start of the kernel (the first page is unmapped later) is used for
 * the kernel_pg_dir. It must be at a position known at link time (as it's used
 * to initialize the init task struct) and since it needs special cache
 * settings, it's the easiest to use this page, the rest of the page is used
 * for further pointer tables.
 * mmu_get_page_table_entry allocates always a whole page for page tables, this
 * means 1024 pages and so 4MB of memory can be mapped. It doesn't make sense
 * to manage page tables in smaller pieces as nearly all mappings have that
 * size.
 *
 * ######################################################################
 *
 *
 * ######################################################################
 *
 * mmu_engage
 * ----------
 *      Thanks to a small helping routine enabling the mmu got quite simple
 * and there is only one way left. mmu_engage makes a complete a new mapping
 * that only includes the absolute necessary to be able to jump to the final
 * postion and to restore the original mapping.
 * As this code doesn't need a transparent translation register anymore this
 * means all registers are free to be used by machines that needs them for
 * other purposes.
 *
 * ######################################################################
 *
 * mmu_print
 * ---------
 *      This algorithm will print out the page tables of the system as
 * appropriate for an 030 or an 040.  This is useful for debugging purposes
 * and as such is enclosed in #ifdef MMU_PRINT/#endif clauses.
 *
 * ######################################################################
 *
 * console_init
 * ------------
 *      The console is also able to be turned off.  The console in head.S
 * is specifically for debugging and can be very useful.  It is surrounded by
 * #ifdef CONSOLE/#endif clauses so it doesn't have to ship in known-good
 * kernels.  It's basic algorithm is to determine the size of the screen
 * (in height/width and bit depth) and then use that information for
 * displaying an 8x8 font or an 8x16 (widthxheight).  I prefer the 8x8 for
 * debugging so I can see more good data.  But it was trivial to add support
 * for both fonts, so I included it.
 *      Also, the algorithm for plotting pixels is abstracted so that in
 * theory other platforms could add support for different kinds of frame
 * buffers.  This could be very useful.
 *
 * console_put_penguin
 * -------------------
 *      An important part of any Linux bring up is the penguin and there's
 * nothing like getting the Penguin on the screen!  This algorithm will work
 * on any machine for which there is a console_plot_pixel.
 *
 * console_scroll
 * --------------
 *      My hope is that the scroll algorithm does the right thing on the
 * various platforms, but it wouldn't be hard to add the test conditions
 * and new code if it doesn't.
 *
 * console_putc
 * -------------
 *
 * ######################################################################
 *
 *      Register usage has greatly simplified within head.S. Every subroutine
 * saves and restores all registers that it modifies (except it returns a
 * value in there of course). So the only register that needs to be initialized
 * is the stack pointer.
 * All other init code and data is now placed in the init section, so it will
 * be automatically freed at the end of the kernel initialization.
 *
 * ######################################################################
 *
 * options
 * -------
 *      There are many options available in a build of this file.  I've
 * taken the time to describe them here to save you the time of searching
 * for them and trying to understand what they mean.
 *
 * CONFIG_xxx:  These are the obvious machine configuration defines created
 * during configuration.  These are defined in include/linux/autoconf.h.
 *
 * CONSOLE:     There is support for head.S console in this file.  This
 * console can talk to a Mac frame buffer, but could easily be extrapolated
 * to extend it to support other platforms.
 *
 * TEST_MMU:    This is a test harness for running on any given machine but
 * getting an MMU dump for another class of machine.  The classes of machines
 * that can be tested are any of the makes (Atari, Amiga, Mac, VME, etc.)
 * and any of the models (030, 040, 060, etc.).
 *
 *      NOTE:   TEST_MMU is NOT permanent!  It is scheduled to be removed
 *              When head.S boots on Atari, Amiga, Macintosh, and VME
 *              machines.  At that point the underlying logic will be
 *              believed to be solid enough to be trusted, and TEST_MMU
 *              can be dropped.  Do note that that will clean up the
 *              head.S code significantly as large blocks of #if/#else
 *              clauses can be removed.
 *
 * MMU_NOCACHE_KERNEL:  On the Macintosh platform there was an inquiry into
 * determing why devices don't appear to work.  A test case was to remove
 * the cacheability of the kernel bits.
 *
 * MMU_PRINT:   There is a routine built into head.S that can display the
 * MMU data structures.  It outputs its result through the serial_putc
 * interface.  So where ever that winds up driving data, that's where the
 * mmu struct will appear.  On the Macintosh that's typically the console.
 *
 * SERIAL_DEBUG:        There are a series of putc() macro statements
 * scattered through out the code to give progress of status to the
 * person sitting at the console.  This constant determines whether those
 * are used.
 *
 * DEBUG:       This is the standard DEBUG flag that can be set for building
 *              the kernel.  It has the effect adding additional tests into
 *              the code.
 *
 * FONT_6x11:
 * FONT_8x8:
 * FONT_8x16:
 *              In theory these could be determined at run time or handed
 *              over by the booter.  But, let's be real, it's a fine hard
 *              coded value.  (But, you will notice the code is run-time
 *              flexible!)  A pointer to the font's struct fbcon_font_desc
 *              is kept locally in Lconsole_font.  It is used to determine
 *              font size information dynamically.
 *
 * Atari constants:
 * USE_PRINTER: Use the printer port for serial debug.
 * USE_SCC_B:   Use the SCC port A (Serial2) for serial debug.
 * USE_SCC_A:   Use the SCC port B (Modem2) for serial debug.
 * USE_MFP:     Use the ST-MFP port (Modem1) for serial debug.
 *
 * Macintosh constants:
 * MAC_SERIAL_DEBUG:    Turns on serial debug output for the Macintosh.
 * MAC_USE_SCC_A:       Use the SCC port A (modem) for serial debug.
 * MAC_USE_SCC_B:       Use the SCC port B (printer) for serial debug (default).
 */
 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include "m68k_defs.h"
 
#ifdef CONFIG_MAC
 
#include 
 
/*
 * Macintosh console support
 */
 
#define CONSOLE
 
/*
 * Macintosh serial debug support; outputs boot info to the printer
 *   and/or modem serial ports
 */
#undef MAC_SERIAL_DEBUG
 
/*
 * Macintosh serial debug port selection; define one or both;
 *   requires MAC_SERIAL_DEBUG to be defined
 */
#define MAC_USE_SCC_A           /* Macintosh modem serial port */
#define MAC_USE_SCC_B           /* Macintosh printer serial port */
 
#endif  /* CONFIG_MAC */
 
#undef MMU_PRINT
#undef MMU_NOCACHE_KERNEL
#define SERIAL_DEBUG
#undef DEBUG
 
/*
 * For the head.S console, there are three supported fonts, 6x11, 8x16 and 8x8.
 * The 8x8 font is harder to read but fits more on the screen.
 */
#define FONT_8x8        /* default */
/* #define FONT_8x16 */ /* 2nd choice */
/* #define FONT_6x11 */ /* 3rd choice */
 
.globl SYMBOL_NAME(kernel_pg_dir)
.globl SYMBOL_NAME(availmem)
.globl SYMBOL_NAME(m68k_pgtable_cachemode)
.globl SYMBOL_NAME(m68k_supervisor_cachemode)
#ifdef CONFIG_MVME16x
.globl SYMBOL_NAME(mvme_bdid)
#endif
#ifdef CONFIG_Q40
.globl SYMBOL_NAME(q40_mem_cptr)
#endif
#ifdef CONFIG_HP300
.globl SYMBOL_NAME(hp300_phys_ram_base)
#endif
 
CPUTYPE_040     = 1     /* indicates an 040 */
CPUTYPE_060     = 2     /* indicates an 060 */
CPUTYPE_0460    = 3     /* if either above are set, this is set */
CPUTYPE_020     = 4     /* indicates an 020 */
 
/* Translation control register */
TC_ENABLE = 0x8000
TC_PAGE8K = 0x4000
TC_PAGE4K = 0x0000
 
/* Transparent translation registers */
TTR_ENABLE      = 0x8000        /* enable transparent translation */
TTR_ANYMODE     = 0x4000        /* user and kernel mode access */
TTR_KERNELMODE  = 0x2000        /* only kernel mode access */
TTR_USERMODE    = 0x0000        /* only user mode access */
TTR_CI          = 0x0400        /* inhibit cache */
TTR_RW          = 0x0200        /* read/write mode */
TTR_RWM         = 0x0100        /* read/write mask */
TTR_FCB2        = 0x0040        /* function code base bit 2 */
TTR_FCB1        = 0x0020        /* function code base bit 1 */
TTR_FCB0        = 0x0010        /* function code base bit 0 */
TTR_FCM2        = 0x0004        /* function code mask bit 2 */
TTR_FCM1        = 0x0002        /* function code mask bit 1 */
TTR_FCM0        = 0x0001        /* function code mask bit 0 */
 
/* Cache Control registers */
CC6_ENABLE_D    = 0x80000000    /* enable data cache (680[46]0) */
CC6_FREEZE_D    = 0x40000000    /* freeze data cache (68060) */
CC6_ENABLE_SB   = 0x20000000    /* enable store buffer (68060) */
CC6_PUSH_DPI    = 0x10000000    /* disable CPUSH invalidation (68060) */
CC6_HALF_D      = 0x08000000    /* half-cache mode for data cache (68060) */
CC6_ENABLE_B    = 0x00800000    /* enable branch cache (68060) */
CC6_CLRA_B      = 0x00400000    /* clear all entries in branch cache (68060) */
CC6_CLRU_B      = 0x00200000    /* clear user entries in branch cache (68060) */
CC6_ENABLE_I    = 0x00008000    /* enable instruction cache (680[46]0) */
CC6_FREEZE_I    = 0x00004000    /* freeze instruction cache (68060) */
CC6_HALF_I      = 0x00002000    /* half-cache mode for instruction cache (68060) */
CC3_ALLOC_WRITE = 0x00002000    /* write allocate mode(68030) */
CC3_ENABLE_DB   = 0x00001000    /* enable data burst (68030) */
CC3_CLR_D       = 0x00000800    /* clear data cache (68030) */
CC3_CLRE_D      = 0x00000400    /* clear entry in data cache (68030) */
CC3_FREEZE_D    = 0x00000200    /* freeze data cache (68030) */
CC3_ENABLE_D    = 0x00000100    /* enable data cache (68030) */
CC3_ENABLE_IB   = 0x00000010    /* enable instruction burst (68030) */
CC3_CLR_I       = 0x00000008    /* clear instruction cache (68030) */
CC3_CLRE_I      = 0x00000004    /* clear entry in instruction cache (68030) */
CC3_FREEZE_I    = 0x00000002    /* freeze instruction cache (68030) */
CC3_ENABLE_I    = 0x00000001    /* enable instruction cache (68030) */
 
/* Miscellaneous definitions */
PAGESIZE        = 4096
PAGESHIFT       = 12
 
ROOT_TABLE_SIZE = 128
PTR_TABLE_SIZE  = 128
PAGE_TABLE_SIZE = 64
ROOT_INDEX_SHIFT = 25
PTR_INDEX_SHIFT  = 18
PAGE_INDEX_SHIFT = 12
 
#ifdef DEBUG
/* When debugging use readable names for labels */
#ifdef __STDC__
#define L(name) .head.S.##name
#else
#define L(name) .head.S./**/name
#endif
#else
#ifdef __STDC__
#define L(name) .L##name
#else
#define L(name) .L/**/name
#endif
#endif
 
/* The __INITDATA stuff is a no-op when ftrace or kgdb are turned on */
#ifndef __INITDATA
#define __INITDATA      .data
#define __FINIT         .previous
#endif
 
/* Several macros to make the writing of subroutines easier:
 * - func_start marks the beginning of the routine which setups the frame
 *   register and saves the registers, it also defines another macro
 *   to automatically restore the registers again.
 * - func_return marks the end of the routine and simply calls the prepared
 *   macro to restore registers and jump back to the caller.
 * - func_define generates another macro to automatically put arguments
 *   onto the stack call the subroutine and cleanup the stack again.
 */
 
/* Within subroutines these macros can be used to access the arguments
 * on the stack. With STACK some allocated memory on the stack can be
 * accessed and ARG0 points to the return address (used by mmu_engage).
 */
#define STACK   %a6@(stackstart)
#define ARG0    %a6@(4)
#define ARG1    %a6@(8)
#define ARG2    %a6@(12)
#define ARG3    %a6@(16)
#define ARG4    %a6@(20)
 
.macro  func_start      name,saveregs,stack=0
L(\name):
        linkw   %a6,#-\stack
        moveml  \saveregs,%sp@-
.set    stackstart,-\stack
 
.macro  func_return_\name
        moveml  %sp@+,\saveregs
        unlk    %a6
        rts
.endm
.endm
 
.macro  func_return     name
        func_return_\name
.endm
 
.macro  func_call       name
        jbsr    L(\name)
.endm
 
.macro  move_stack      nr,arg1,arg2,arg3,arg4
.if     \nr
        move_stack      "(\nr-1)",\arg2,\arg3,\arg4
        movel   \arg1,%sp@-
.endif
.endm
 
.macro  func_define     name,nr=0
.macro  \name   arg1,arg2,arg3,arg4
        move_stack      \nr,\arg1,\arg2,\arg3,\arg4
        func_call       \name
.if     \nr
        lea     %sp@(\nr*4),%sp
.endif
.endm
.endm
 
func_define     mmu_map,4
func_define     mmu_map_tt,4
func_define     mmu_fixup_page_mmu_cache,1
func_define     mmu_temp_map,2
func_define     mmu_engage
func_define     mmu_get_root_table_entry,1
func_define     mmu_get_ptr_table_entry,2
func_define     mmu_get_page_table_entry,2
func_define     mmu_print
func_define     get_new_page
#ifdef CONFIG_HP300
func_define     set_leds
#endif
 
.macro  mmu_map_eq      arg1,arg2,arg3
        mmu_map \arg1,\arg1,\arg2,\arg3
.endm
 
.macro  get_bi_record   record
        pea     \record
        func_call       get_bi_record
        addql   #4,%sp
.endm
 
func_define     serial_putc,1
func_define     console_putc,1
 
.macro  putc    ch
#if defined(CONSOLE) || defined(SERIAL_DEBUG)
        pea     \ch
#endif
#ifdef CONSOLE
        func_call       console_putc
#endif
#ifdef SERIAL_DEBUG
        func_call       serial_putc
#endif
#if defined(CONSOLE) || defined(SERIAL_DEBUG)
        addql   #4,%sp
#endif
.endm
 
.macro  dputc   ch
#ifdef DEBUG
        putc    \ch
#endif
.endm
 
func_define     putn,1
 
.macro  dputn   nr
#ifdef DEBUG
        putn    \nr
#endif
.endm
 
.macro  puts            string
#if defined(CONSOLE) || defined(SERIAL_DEBUG)
        __INITDATA
.Lstr\@:
        .string "\string"
        __FINIT
        pea     %pc@(.Lstr\@)
        func_call       puts
        addql   #4,%sp
#endif
.endm
 
.macro  dputs   string
#ifdef DEBUG
        puts    "\string"
#endif
.endm
 
#define is_not_amiga(lab) cmpl &MACH_AMIGA,%pc@(m68k_machtype); jne lab
#define is_not_atari(lab) cmpl &MACH_ATARI,%pc@(m68k_machtype); jne lab
#define is_not_mac(lab) cmpl &MACH_MAC,%pc@(m68k_machtype); jne lab
#define is_not_mvme147(lab) cmpl &MACH_MVME147,%pc@(m68k_machtype); jne lab
#define is_not_mvme16x(lab) cmpl &MACH_MVME16x,%pc@(m68k_machtype); jne lab
#define is_not_bvme6000(lab) cmpl &MACH_BVME6000,%pc@(m68k_machtype); jne lab
#define is_mvme147(lab) cmpl &MACH_MVME147,%pc@(m68k_machtype); jeq lab
#define is_mvme16x(lab) cmpl &MACH_MVME16x,%pc@(m68k_machtype); jeq lab
#define is_bvme6000(lab) cmpl &MACH_BVME6000,%pc@(m68k_machtype); jeq lab
#define is_not_hp300(lab) cmpl &MACH_HP300,%pc@(m68k_machtype); jne lab
#define is_not_apollo(lab) cmpl &MACH_APOLLO,%pc@(m68k_machtype); jne lab
#define is_not_q40(lab) cmpl &MACH_Q40,%pc@(m68k_machtype); jne lab
#define is_not_sun3x(lab) cmpl &MACH_SUN3X,%pc@(m68k_machtype); jne lab
 
#define hasnt_leds(lab) cmpl &MACH_HP300,%pc@(m68k_machtype); \
                        jeq 42f; \
                        cmpl &MACH_APOLLO,%pc@(m68k_machtype); \
                        jne lab ;\
                42:\
 
#define is_040_or_060(lab)      btst &CPUTYPE_0460,%pc@(L(cputype)+3); jne lab
#define is_not_040_or_060(lab)  btst &CPUTYPE_0460,%pc@(L(cputype)+3); jeq lab
#define is_040(lab)             btst &CPUTYPE_040,%pc@(L(cputype)+3); jne lab
#define is_060(lab)             btst &CPUTYPE_060,%pc@(L(cputype)+3); jne lab
#define is_not_060(lab)         btst &CPUTYPE_060,%pc@(L(cputype)+3); jeq lab
#define is_020(lab)             btst &CPUTYPE_020,%pc@(L(cputype)+3); jne lab
#define is_not_020(lab)         btst &CPUTYPE_020,%pc@(L(cputype)+3); jeq lab
 
/* On the HP300 we use the on-board LEDs for debug output before
   the console is running.  Writing a 1 bit turns the corresponding LED
   _off_ - on the 340 bit 7 is towards the back panel of the machine.  */
.macro  leds    mask
#if defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
        hasnt_leds(.Lled\@)
        pea     \mask
        func_call       set_leds
        addql   #4,%sp
.Lled\@:
#endif
.endm
 
.text
ENTRY(_stext)
/*
 * Version numbers of the bootinfo interface
 * The area from _stext to _start will later be used as kernel pointer table
 */
        bras    1f      /* Jump over bootinfo version numbers */
 
        .long   BOOTINFOV_MAGIC
        .long   MACH_AMIGA, AMIGA_BOOTI_VERSION
        .long   MACH_ATARI, ATARI_BOOTI_VERSION
        .long   MACH_MVME147, MVME147_BOOTI_VERSION
        .long   MACH_MVME16x, MVME16x_BOOTI_VERSION
        .long   MACH_BVME6000, BVME6000_BOOTI_VERSION
        .long   MACH_MAC, MAC_BOOTI_VERSION
        .long   MACH_Q40, Q40_BOOTI_VERSION
        .long   0
1:      jra     SYMBOL_NAME(__start)
 
.equ    SYMBOL_NAME(kernel_pg_dir),SYMBOL_NAME(_stext)
 
.equ    .,SYMBOL_NAME(_stext)+PAGESIZE
 
ENTRY(_start)
        jra     SYMBOL_NAME(__start)
__INIT
ENTRY(__start)
 
#ifdef CONFIG_HP300
/* This is a hack.  The HP NetBSD bootloader loads us at an arbitrary
   address (apparently 0xff002000 in practice) which is not good if we need
   to be able to map this to VA 0x1000.  We could do it with pagetables but
   a better solution seems to be to relocate the kernel in physical memory
   before we start.
 
   So, we copy the entire kernel image (code+data+bss) down to the 16MB
   boundary that marks the start of RAM.  This is slightly tricky because
   we must not overwrite the copying code itself. :-)  */
 
/* 15/5/98.  The start address of physical RAM changes depending on how much
   RAM is present.  This is actually a blessing in disguise as it provides
   a way for us to work out the RAM size rather than hardwiring it.  */
 
        lea     %pc@(_start),%a0
        movel   %a0,%d6
        and     #0xffff0000, %d6
        lea     %pc@(SYMBOL_NAME(hp300_phys_ram_base)),%a0
        movel   %d6, %a0@
        movel   %pc@(L(custom)),%a3
        moveb   #0xfe,%d7
        moveb   %d7,%a3@(0x1ffff)
        lea     %pc@(Lcopystart),%a0
        lea     %pc@(Lcopyend),%a1
        movel   %d6,%a2                 /* Start of physical RAM */
1:      moveb   %a0@+,%d0
        moveb   %d0,%a2@+
        cmpl    %a0,%a1
        jbne    1b
        movel   %d6,%a2
        moveb   #0xfd,%d7
        moveb   %d7,%a3@(0x1ffff)
        lea     %pc@(_stext),%a0
        lea     %pc@(_end),%a1
        jmp     %a2@
 
Lcopystart:
        moveb   #0xf7,%d7
        moveb   %d7,%a3@(0x1ffff)
        movel   %d6,%a2 /* Start of kernel */
        add     #0x1000,%a2
1:      moveb   %a0@+,%d0
        moveb   %d0,%a2@+
        cmpl    %a0,%a1
        jbne    1b
        moveb   #0,%d7
        moveb   %d7,%a3@(0x1ffff)
        movel   %d6,%a0
        addl    #Lstart1,%a0
        jmp     %a0@
Lcopyend:
 
Lstart1:
        moveb   #0x3f,%d7
        moveb   %d7,%a3@(0x1ffff)
#endif /* CONFIG_HP300 */
 
/*
 * Setup initial stack pointer
 */
        lea     %pc@(SYMBOL_NAME(_stext)),%sp
 
/*
 * Record the CPU and machine type.
 */
 
#ifndef CONFIG_HP300
        get_bi_record   BI_MACHTYPE
        lea     %pc@(SYMBOL_NAME(m68k_machtype)),%a1
        movel   %a0@,%a1@
 
        get_bi_record   BI_FPUTYPE
        lea     %pc@(SYMBOL_NAME(m68k_fputype)),%a1
        movel   %a0@,%a1@
 
        get_bi_record   BI_MMUTYPE
        lea     %pc@(SYMBOL_NAME(m68k_mmutype)),%a1
        movel   %a0@,%a1@
 
        get_bi_record   BI_CPUTYPE
        lea     %pc@(SYMBOL_NAME(m68k_cputype)),%a1
        movel   %a0@,%a1@
#else /* CONFIG_HP300 */
        /* FIXME HP300 doesn't use bootinfo yet */
        movel   #MACH_HP300,%d4
        lea     %pc@(SYMBOL_NAME(m68k_machtype)),%a0
        movel   %d4,%a0@
        movel   #FPU_68881,%d0
        lea     %pc@(SYMBOL_NAME(m68k_fputype)),%a0
        movel   %d0,%a0@
        movel   #MMU_68030,%d0
        lea     %pc@(SYMBOL_NAME(m68k_mmutype)),%a0
        movel   %d0,%a0@
        movel   #CPU_68030,%d0
        lea     %pc@(SYMBOL_NAME(m68k_cputype)),%a0
        movel   %d0,%a0@
 
        leds(0x1)
#endif /* CONFIG_HP300 */
 
#ifdef CONFIG_MAC
/*
 * For Macintosh, we need to determine the display parameters early (at least
 * while debugging it).
 */
 
        is_not_mac(L(test_notmac))
 
        get_bi_record   BI_MAC_VADDR
        lea     %pc@(L(mac_videobase)),%a1
        movel   %a0@,%a1@
 
        get_bi_record   BI_MAC_VDEPTH
        lea     %pc@(L(mac_videodepth)),%a1
        movel   %a0@,%a1@
 
        get_bi_record   BI_MAC_VDIM
        lea     %pc@(L(mac_dimensions)),%a1
        movel   %a0@,%a1@
 
        get_bi_record   BI_MAC_VROW
        lea     %pc@(L(mac_rowbytes)),%a1
        movel   %a0@,%a1@
 
#ifdef MAC_SERIAL_DEBUG
        get_bi_record   BI_MAC_SCCBASE
        lea     %pc@(L(mac_sccbase)),%a1
        movel   %a0@,%a1@
#endif /* MAC_SERIAL_DEBUG */
 
#if 0
        /*
         * Clear the screen
         */
        lea     %pc@(L(mac_videobase)),%a0
        movel   %a0@,%a1
        lea     %pc@(L(mac_dimensions)),%a0
        movel   %a0@,%d1
        swap    %d1             /* #rows is high bytes */
        andl    #0xFFFF,%d1     /* rows */
        subl    #10,%d1
        lea     %pc@(L(mac_rowbytes)),%a0
loopy2:
        movel   %a0@,%d0
        subql   #1,%d0
loopx2:
        moveb   #0x55, %a1@+
        dbra    %d0,loopx2
        dbra    %d1,loopy2
#endif
 
L(test_notmac):
#endif /* CONFIG_MAC */
 
 
/*
 * There are ultimately two pieces of information we want for all kinds of
 * processors CpuType and CacheBits.  The CPUTYPE was passed in from booter
 * and is converted here from a booter type definition to a separate bit
 * number which allows for the standard is_0x0 macro tests.
 */
        movel   %pc@(SYMBOL_NAME(m68k_cputype)),%d0
        /*
         * Assume it's an 030
         */
        clrl    %d1
 
        /*
         * Test the BootInfo cputype for 060
         */
        btst    #CPUB_68060,%d0
        jeq     1f
        bset    #CPUTYPE_060,%d1
        bset    #CPUTYPE_0460,%d1
        jra     3f
1:
        /*
         * Test the BootInfo cputype for 040
         */
        btst    #CPUB_68040,%d0
        jeq     2f
        bset    #CPUTYPE_040,%d1
        bset    #CPUTYPE_0460,%d1
        jra     3f
2:
        /*
         * Test the BootInfo cputype for 020
         */
        btst    #CPUB_68020,%d0
        jeq     3f
        bset    #CPUTYPE_020,%d1
        jra     3f
3:
        /*
         * Record the cpu type
         */
        lea     %pc@(L(cputype)),%a0
        movel   %d1,%a0@
 
        /*
         * NOTE:
         *
         * Now the macros are valid:
         *      is_040_or_060
         *      is_not_040_or_060
         *      is_040
         *      is_060
         *      is_not_060
         */
 
        /*
         * Determine the cache mode for pages holding MMU tables
         * and for supervisor mode, unused for '020 and '030
         */
        clrl    %d0
        clrl    %d1
 
        is_not_040_or_060(L(save_cachetype))
 
        /*
         * '040 or '060
         * d1 := cacheable write-through
         * NOTE: The 68040 manual strongly recommends non-cached for MMU tables,
         * but we have been using write-through since at least 2.0.29 so I
         * guess it is OK.
         */
#ifdef CONFIG_060_WRITETHROUGH
        /*
         * If this is a 68060 board using drivers with cache coherency
         * problems, then supervisor memory accesses need to be write-through
         * also; otherwise, we want copyback.
         */
 
        is_not_060(1f)
        movel   #_PAGE_CACHE040W,%d0
        jra     L(save_cachetype)
#endif /* CONFIG_060_WRITETHROUGH */
1:
        movew   #_PAGE_CACHE040,%d0
 
        movel   #_PAGE_CACHE040W,%d1
 
L(save_cachetype):
        /* Save cache mode for supervisor mode and page tables
         */
        lea     %pc@(SYMBOL_NAME(m68k_supervisor_cachemode)),%a0
        movel   %d0,%a0@
        lea     %pc@(SYMBOL_NAME(m68k_pgtable_cachemode)),%a0
        movel   %d1,%a0@
 
/*
 * raise interrupt level
 */
        movew   #0x2700,%sr
 
/*
   If running on an Atari, determine the I/O base of the
   serial port and test if we are running on a Medusa or Hades.
   This test is necessary here, because on the Hades the serial
   port is only accessible in the high I/O memory area.
 
   The test whether it is a Medusa is done by writing to the byte at
   phys. 0x0. This should result in a bus error on all other machines.
 
   ...should, but doesn't. The Afterburner040 for the Falcon has the
   same behaviour (0x0..0x7 are no ROM shadow). So we have to do
   another test to distinguish Medusa and AB040. This is a
   read attempt for 0x00ff82fe phys. that should bus error on a Falcon
   (+AB040), but is in the range where the Medusa always asserts DTACK.
 
   The test for the Hades is done by reading address 0xb0000000. This
   should give a bus error on the Medusa.
 */
 
#ifdef CONFIG_ATARI
        is_not_atari(L(notypetest))
 
        /* get special machine type (Medusa/Hades/AB40) */
        moveq   #0,%d3 /* default if tag doesn't exist */
        get_bi_record   BI_ATARI_MCH_TYPE
        tstl    %d0
        jbmi    1f
        movel   %a0@,%d3
        lea     %pc@(SYMBOL_NAME(atari_mch_type)),%a0
        movel   %d3,%a0@
1:
        /* On the Hades, the iobase must be set up before opening the
         * serial port. There are no I/O regs at 0x00ffxxxx at all. */
        moveq   #0,%d0
        cmpl    #ATARI_MACH_HADES,%d3
        jbne    1f
        movel   #0xff000000,%d0         /* Hades I/O base addr: 0xff000000 */
1:      lea     %pc@(L(iobase)),%a0
        movel   %d0,%a0@
 
L(notypetest):
#endif
 
#ifdef CONFIG_VME
        is_mvme147(L(getvmetype))
        is_bvme6000(L(getvmetype))
        is_not_mvme16x(L(gvtdone))
 
        /* See if the loader has specified the BI_VME_TYPE tag.  Recent
         * versions of VMELILO and TFTPLILO do this.  We have to do this
         * early so we know how to handle console output.  If the tag
         * doesn't exist then we use the Bug for output on MVME16x.
         */
L(getvmetype):
        get_bi_record   BI_VME_TYPE
        tstl    %d0
        jbmi    1f
        movel   %a0@,%d3
        lea     %pc@(SYMBOL_NAME(vme_brdtype)),%a0
        movel   %d3,%a0@
1:
#ifdef CONFIG_MVME16x
        is_not_mvme16x(L(gvtdone))
 
        /* Need to get the BRD_ID info to differentiate between 162, 167,
         * etc.  This is available as a BI_VME_BRDINFO tag with later
         * versions of VMELILO and TFTPLILO, otherwise we call the Bug.
         */
        get_bi_record   BI_VME_BRDINFO
        tstl    %d0
        jpl     1f
 
        /* Get pointer to board ID data from Bug */
        movel   %d2,%sp@-
        trap    #15
        .word   0x70            /* trap 0x70 - .BRD_ID */
        movel   %sp@+,%a0
1:
        lea     %pc@(SYMBOL_NAME(mvme_bdid)),%a1
        /* Structure is 32 bytes long */
        movel   %a0@+,%a1@+
        movel   %a0@+,%a1@+
        movel   %a0@+,%a1@+
        movel   %a0@+,%a1@+
        movel   %a0@+,%a1@+
        movel   %a0@+,%a1@+
        movel   %a0@+,%a1@+
        movel   %a0@+,%a1@+
#endif
 
L(gvtdone):
 
#endif
 
/*
 * Initialize serial port
 */
        jbsr    L(serial_init)
 
/*
 * Initialize console
 */
#ifdef CONFIG_MAC
        is_not_mac(L(nocon))
#ifdef CONSOLE
        jbsr    L(console_init)
#ifdef CONSOLE_PENGUIN
        jbsr    L(console_put_penguin)
#endif  /* CONSOLE_PENGUIN */
        jbsr    L(console_put_stats)
#endif  /* CONSOLE */
L(nocon):
#endif  /* CONFIG_MAC */
 
 
        putc    '\n'
        putc    'A'
#ifdef CONFIG_HP300
        leds(0x2)
#endif /* CONFIG_HP300 */
        dputn   %pc@(L(cputype))
        dputn   %pc@(SYMBOL_NAME(m68k_supervisor_cachemode))
        dputn   %pc@(SYMBOL_NAME(m68k_pgtable_cachemode))
        dputc   '\n'
 
/*
 * Save physical start address of kernel
 */
        lea     %pc@(L(phys_kernel_start)),%a0
        lea     %pc@(SYMBOL_NAME(_stext)),%a1
        subl    #SYMBOL_NAME(_stext),%a1
        addl    #PAGE_OFFSET,%a1
        movel   %a1,%a0@
 
        putc    'B'
 
        leds    0x4
 
/*
 *      mmu_init
 *
 *      This block of code does what's necessary to map in the various kinds
 *      of machines for execution of Linux.
 *      First map the first 4 MB of kernel code & data
 */
 
        mmu_map #PAGE_OFFSET,%pc@(L(phys_kernel_start)),#4*1024*1024,\
                %pc@(SYMBOL_NAME(m68k_supervisor_cachemode))
 
        putc    'C'
 
#ifdef CONFIG_AMIGA
 
L(mmu_init_amiga):
 
        is_not_amiga(L(mmu_init_not_amiga))
/*
 * mmu_init_amiga
 */
 
        putc    'D'
 
        is_not_040_or_060(1f)
 
        /*
         * 040: Map the 16Meg range physical 0x0 upto logical 0x8000.0000
         */
        mmu_map         #0x80000000,#0,#0x01000000,#_PAGE_NOCACHE_S
        /*
         * Map the Zorro III I/O space with transparent translation
         * for frame buffer memory etc.
         */
        mmu_map_tt      #1,#0x40000000,#0x20000000,#_PAGE_NOCACHE_S
 
        jbra    L(mmu_init_done)
 
1:
        /*
         * 030: Map the 32Meg range physical 0x0 upto logical 0x8000.0000
         */
        mmu_map         #0x80000000,#0,#0x02000000,#_PAGE_NOCACHE030
        mmu_map_tt      #1,#0x40000000,#0x20000000,#_PAGE_NOCACHE030
 
        jbra    L(mmu_init_done)
 
L(mmu_init_not_amiga):
#endif
 
#ifdef CONFIG_ATARI
 
L(mmu_init_atari):
 
        is_not_atari(L(mmu_init_not_atari))
 
        putc    'E'
 
/* On the Atari, we map the I/O region (phys. 0x00ffxxxx) by mapping
   the last 16 MB of virtual address space to the first 16 MB (i.e.
   0xffxxxxxx -> 0x00xxxxxx). For this, an additional pointer table is
   needed. I/O ranges are marked non-cachable.
 
   For the Medusa it is better to map the I/O region transparently
   (i.e. 0xffxxxxxx -> 0xffxxxxxx), because some I/O registers are
   accessible only in the high area.
 
   On the Hades all I/O registers are only accessible in the high
   area.
*/
 
        /* I/O base addr for non-Medusa, non-Hades: 0x00000000 */
        moveq   #0,%d0
        movel   %pc@(SYMBOL_NAME(atari_mch_type)),%d3
        cmpl    #ATARI_MACH_MEDUSA,%d3
        jbeq    2f
        cmpl    #ATARI_MACH_HADES,%d3
        jbne    1f
2:      movel   #0xff000000,%d0 /* Medusa/Hades base addr: 0xff000000 */
1:      movel   %d0,%d3
 
        is_040_or_060(L(spata68040))
 
        /* Map everything non-cacheable, though not all parts really
         * need to disable caches (crucial only for 0xff8000..0xffffff
         * (standard I/O) and 0xf00000..0xf3ffff (IDE)). The remainder
         * isn't really used, except for sometimes peeking into the
         * ROMs (mirror at phys. 0x0), so caching isn't necessary for
         * this. */
        mmu_map #0xff000000,%d3,#0x01000000,#_PAGE_NOCACHE030
 
        jbra    L(mmu_init_done)
 
L(spata68040):
 
        mmu_map #0xff000000,%d3,#0x01000000,#_PAGE_NOCACHE_S
 
        jbra    L(mmu_init_done)
 
L(mmu_init_not_atari):
#endif
 
#ifdef CONFIG_Q40
        is_not_q40(L(notq40))
        /*
         * add transparent mapping for 0xff00 0000 - 0xffff ffff
         * non-cached serialized etc..
         * this includes master chip, DAC, RTC and ISA ports
         * 0xfe000000-0xfeffffff is for screen and ROM
         */
 
        putc    'Q'
 
        mmu_map_tt      #0,#0xfe000000,#0x01000000,#_PAGE_CACHE040W
        mmu_map_tt      #1,#0xff000000,#0x01000000,#_PAGE_NOCACHE_S
 
        jbra    L(mmu_init_done)
 
L(notq40):
#endif
 
#ifdef CONFIG_HP300
        is_not_hp300(L(nothp300))
 
/* On the HP300, we map the ROM, INTIO and DIO regions (phys. 0x00xxxxxx)
   by mapping 32MB from 0xf0xxxxxx -> 0x00xxxxxx) using an 030 early
   termination page descriptor.  The ROM mapping is needed because the LEDs
   are mapped there too.  */
 
        mmu_map #0xf0000000,#0,#0x02000000,#_PAGE_NOCACHE030
 
L(nothp300):
 
#endif
 
#ifdef CONFIG_MVME147
 
       is_not_mvme147(L(not147))
 
       /*
        * On MVME147 we have already created kernel page tables for
        * 4MB of RAM at address 0, so now need to do a transparent
        * mapping of the top of memory space.  Make it 0.5GByte for now,
        * so we can access on-board i/o areas.
        */
 
       mmu_map_tt      #1,#0xe0000000,#0x20000000,#_PAGE_NOCACHE030
 
       jbra    L(mmu_init_done)
 
L(not147):
#endif /* CONFIG_MVME147 */
 
#ifdef CONFIG_MVME16x
 
        is_not_mvme16x(L(not16x))
 
        /*
         * On MVME16x we have already created kernel page tables for
         * 4MB of RAM at address 0, so now need to do a transparent
         * mapping of the top of memory space.  Make it 0.5GByte for now.
         * Supervisor only access, so transparent mapping doesn't
         * clash with User code virtual address space.
         * this covers IO devices, PROM and SRAM.  The PROM and SRAM
         * mapping is needed to allow 167Bug to run.
         * IO is in the range 0xfff00000 to 0xfffeffff.
         * PROM is 0xff800000->0xffbfffff and SRAM is
         * 0xffe00000->0xffe1ffff.
         */
 
        mmu_map_tt      #1,#0xe0000000,#0x20000000,#_PAGE_NOCACHE_S
 
        jbra    L(mmu_init_done)
 
L(not16x):
#endif  /* CONFIG_MVME162 | CONFIG_MVME167 */
 
#ifdef CONFIG_BVME6000
 
        is_not_bvme6000(L(not6000))
 
        /*
         * On BVME6000 we have already created kernel page tables for
         * 4MB of RAM at address 0, so now need to do a transparent
         * mapping of the top of memory space.  Make it 0.5GByte for now,
         * so we can access on-board i/o areas.
         * Supervisor only access, so transparent mapping doesn't
         * clash with User code virtual address space.
         */
 
        mmu_map_tt      #1,#0xe0000000,#0x20000000,#_PAGE_NOCACHE_S
 
        jbra    L(mmu_init_done)
 
L(not6000):
#endif /* CONFIG_BVME6000 */
 
/*
 * mmu_init_mac
 *
 * The Macintosh mappings are less clear.
 *
 * Even as of this writing, it is unclear how the
 * Macintosh mappings will be done.  However, as
 * the first author of this code I'm proposing the
 * following model:
 *
 * Map the kernel (that's already done),
 * Map the I/O (on most machines that's the
 * 0x5000.0000 ... 0x5300.0000 range,
 * Map the video frame buffer using as few pages
 * as absolutely (this requirement mostly stems from
 * the fact that when the frame buffer is at
 * 0x0000.0000 then we know there is valid RAM just
 * above the screen that we don't want to waste!).
 *
 * By the way, if the frame buffer is at 0x0000.0000
 * then the Macintosh is known as an RBV based Mac.
 *
 * By the way 2, the code currently maps in a bunch of
 * regions.  But I'd like to cut that out.  (And move most
 * of the mappings up into the kernel proper ... or only
 * map what's necessary.)
 */
 
#ifdef CONFIG_MAC
 
L(mmu_init_mac):
 
        is_not_mac(L(mmu_init_not_mac))
 
        putc    'F'
 
        lea     %pc@(L(mac_videobase)),%a0
        lea     %pc@(L(console_video_virtual)),%a1
        movel   %a0@,%a1@
 
        is_not_040_or_060(1f)
 
        moveq   #_PAGE_NOCACHE_S,%d3
        jbra    2f
1:
        moveq   #_PAGE_NOCACHE030,%d3
2:
        /*
         * Mac Note: screen address of logical 0xF000.0000 -> 
         *           we simply map the 4MB that contains the videomem
         */
 
        movel   #VIDEOMEMMASK,%d0
        andl    L(mac_videobase),%d0
 
        mmu_map         #VIDEOMEMBASE,%d0,#VIDEOMEMSIZE,%d3
        /* The ROM starts at 4000 0000                  */
        mmu_map_eq      #0x40000000,#0x02000000,%d3
        /* IO devices                                   */
        mmu_map_eq      #0x50000000,#0x03000000,%d3
        /* NuBus slot space                             */
        mmu_map_tt      #1,#0xf8000000,#0x08000000,%d3
 
        jbra    L(mmu_init_done)
 
L(mmu_init_not_mac):
#endif
 
#ifdef CONFIG_SUN3X
        is_not_sun3x(L(notsun3x))
 
        /* oh, the pain..  We're gonna want the prom code after
         * starting the MMU, so we copy the mappings, translating
         * from 8k -> 4k pages as we go.
         */
 
        /* copy maps from 0xfee00000 to 0xff000000 */
        movel   #0xfee00000, %d0
        moveq   #ROOT_INDEX_SHIFT, %d1
        lsrl    %d1,%d0
        mmu_get_root_table_entry        %d0
 
        movel   #0xfee00000, %d0
        moveq   #PTR_INDEX_SHIFT, %d1
        lsrl    %d1,%d0
        andl    #PTR_TABLE_SIZE-1, %d0
        mmu_get_ptr_table_entry         %a0,%d0
 
        movel   #0xfee00000, %d0
        moveq   #PAGE_INDEX_SHIFT, %d1
        lsrl    %d1,%d0
        andl    #PAGE_TABLE_SIZE-1, %d0
        mmu_get_page_table_entry        %a0,%d0
 
        /* this is where the prom page table lives */
        movel   0xfefe00d4, %a1
        movel   %a1@, %a1
 
        movel   #((0x200000 >> 13)-1), %d1
 
1:
        movel   %a1@+, %d3
        movel   %d3,%a0@+
        addl    #0x1000,%d3
        movel   %d3,%a0@+
 
        dbra    %d1,1b
 
        /* setup tt1 for I/O */
        mmu_map_tt      #1,#0x40000000,#0x40000000,#_PAGE_NOCACHE_S
        jbra    L(mmu_init_done)
 
L(notsun3x):
#endif
 
#ifdef CONFIG_APOLLO
        is_not_apollo(L(notapollo))
 
        putc    'P'
        mmu_map         #0x80000000,#0,#0x02000000,#_PAGE_NOCACHE030
 
L(notapollo):
        jbra    L(mmu_init_done)
#endif
 
L(mmu_init_done):
 
        putc    'G'
        leds    0x8
 
/*
 * mmu_fixup
 *
 * On the 040 class machines, all pages that are used for the
 * mmu have to be fixed up. According to Motorola, pages holding mmu
 * tables should be non-cacheable on a '040 and write-through on a
 * '060. But analysis of the reasons for this, and practical
 * experience, showed that write-through also works on a '040.
 *
 * Allocated memory so far goes from kernel_end to memory_start that
 * is used for all kind of tables, for that the cache attributes
 * are now fixed.
 */
L(mmu_fixup):
 
        is_not_040_or_060(L(mmu_fixup_done))
 
#ifdef MMU_NOCACHE_KERNEL
        jbra    L(mmu_fixup_done)
#endif
 
        /* first fix the page at the start of the kernel, that
         * contains also kernel_pg_dir.
         */
        movel   %pc@(L(phys_kernel_start)),%d0
        subl    #PAGE_OFFSET,%d0
        lea     %pc@(SYMBOL_NAME(_stext)),%a0
        subl    %d0,%a0
        mmu_fixup_page_mmu_cache        %a0
 
        movel   %pc@(L(kernel_end)),%a0
        subl    %d0,%a0
        movel   %pc@(L(memory_start)),%a1
        subl    %d0,%a1
        bra     2f
1:
        mmu_fixup_page_mmu_cache        %a0
        addw    #PAGESIZE,%a0
2:
        cmpl    %a0,%a1
        jgt     1b
 
L(mmu_fixup_done):
 
#ifdef MMU_PRINT
        mmu_print
#endif
 
/*
 * mmu_engage
 *
 * This chunk of code performs the gruesome task of engaging the MMU.
 * The reason its gruesome is because when the MMU becomes engaged it
 * maps logical addresses to physical addresses.  The Program Counter
 * register is then passed through the MMU before the next instruction
 * is fetched (the instruction following the engage MMU instruction).
 * This may mean one of two things:
 * 1. The Program Counter falls within the logical address space of
 *    the kernel of which there are two sub-possibilities:
 *    A. The PC maps to the correct instruction (logical PC == physical
 *       code location), or
 *    B. The PC does not map through and the processor will read some
 *       data (or instruction) which is not the logically next instr.
 *    As you can imagine, A is good and B is bad.
 * Alternatively,
 * 2. The Program Counter does not map through the MMU.  The processor
 *    will take a Bus Error.
 * Clearly, 2 is bad.
 * It doesn't take a wiz kid to figure you want 1.A.
 * This code creates that possibility.
 * There are two possible 1.A. states (we now ignore the other above states):
 * A. The kernel is located at physical memory addressed the same as
 *    the logical memory for the kernel, i.e., 0x01000.
 * B. The kernel is located some where else.  e.g., 0x0400.0000
 *
 *    Under some conditions the Macintosh can look like A or B.
 * [A friend and I once noted that Apple hardware engineers should be
 * wacked twice each day: once when they show up at work (as in, Whack!,
 * "This is for the screwy hardware we know you're going to design today."),
 * and also at the end of the day (as in, Whack! "I don't know what
 * you designed today, but I'm sure it wasn't good."). -- rst]
 *
 * This code works on the following premise:
 * If the kernel start (%d5) is within the first 16 Meg of RAM,
 * then create a mapping for the kernel at logical 0x8000.0000 to
 * the physical location of the pc.  And, create a transparent
 * translation register for the first 16 Meg.  Then, after the MMU
 * is engaged, the PC can be moved up into the 0x8000.0000 range
 * and then the transparent translation can be turned off and then
 * the PC can jump to the correct logical location and it will be
 * home (finally).  This is essentially the code that the Amiga used
 * to use.  Now, it's generalized for all processors.  Which means
 * that a fresh (but temporary) mapping has to be created.  The mapping
 * is made in page 0 (an as of yet unused location -- except for the
 * stack!).  This temporary mapping will only require 1 pointer table
 * and a single page table (it can map 256K).
 *
 * OK, alternatively, imagine that the Program Counter is not within
 * the first 16 Meg.  Then, just use Transparent Translation registers
 * to do the right thing.
 *
 * Last, if _start is already at 0x01000, then there's nothing special
 * to do (in other words, in a degenerate case of the first case above,
 * do nothing).
 *
 * Let's do it.
 *
 *
 */
 
        putc    'H'
 
        mmu_engage
 
/*
 * After this point no new memory is allocated and
 * the start of available memory is stored in availmem.
 * (The bootmem allocator requires now the physicall address.)
 */
 
        movel   L(memory_start),availmem
 
#ifdef CONFIG_AMIGA
        is_not_amiga(1f)
        /* fixup the Amiga custom register location before printing */
        clrl    L(custom)
1:
#endif
 
#ifdef CONFIG_ATARI
        is_not_atari(1f)
        /* fixup the Atari iobase register location before printing */
        movel   #0xff000000,L(iobase)
1:
#endif
 
#ifdef CONFIG_MAC
        is_not_mac(1f)
        movel   #~VIDEOMEMMASK,%d0
        andl    L(mac_videobase),%d0
        addl    #VIDEOMEMBASE,%d0
        movel   %d0,L(mac_videobase)
#ifdef MAC_SERIAL_DEBUG
        orl     #0x50000000,L(mac_sccbase)
#endif
1:
#endif
 
#ifdef CONFIG_HP300
        is_not_hp300(1f)
        /*
         * Fix up the custom register to point to the new location of the LEDs.
         */
        movel   #0xf0000000,L(custom)
 
        /*
         * Energise the FPU and caches.
         */
        movel   #0x60,0xf05f400c
1:
#endif
 
#ifdef CONFIG_SUN3X
        is_not_sun3x(1f)
 
        /* enable copro */
        oriw    #0x4000,0x61000000
1:
#endif
 
#ifdef CONFIG_APOLLO
        is_not_apollo(1f)
 
        /*
         * Fix up the iobase before printing
         */
        movel   #0x80000000,L(iobase)
1:
#endif
 
        putc    'I'
        leds    0x10
 
/*
 * Enable caches
 */
 
        is_not_040_or_060(L(cache_not_680460))
 
L(cache680460):
        .chip   68040
        nop
        cpusha  %bc
        nop
 
        is_060(L(cache68060))
 
        movel   #CC6_ENABLE_D+CC6_ENABLE_I,%d0
        /* MMU stuff works in copyback mode now, so enable the cache */
        movec   %d0,%cacr
        jra     L(cache_done)
 
L(cache68060):
        movel   #CC6_ENABLE_D+CC6_ENABLE_I+CC6_ENABLE_SB+CC6_PUSH_DPI+CC6_ENABLE_B+CC6_CLRA_B,%d0
        /* MMU stuff works in copyback mode now, so enable the cache */
        movec   %d0,%cacr
        /* enable superscalar dispatch in PCR */
        moveq   #1,%d0
        .chip   68060
        movec   %d0,%pcr
 
        jbra    L(cache_done)
L(cache_not_680460):
L(cache68030):
        .chip   68030
        movel   #CC3_ENABLE_DB+CC3_CLR_D+CC3_ENABLE_D+CC3_ENABLE_IB+CC3_CLR_I+CC3_ENABLE_I,%d0
        movec   %d0,%cacr
 
        jra     L(cache_done)
        .chip   68k
L(cache_done):
 
        putc    'J'
 
/*
 * Setup initial stack pointer
 */
        lea     SYMBOL_NAME(init_task_union),%curptr
        lea     0x2000(%curptr),%sp
 
        putc    'K'
 
        subl    %a6,%a6         /* clear a6 for gdb */
 
/*
 * The new 64bit printf support requires an early exception initialization.
 */
        jbsr    SYMBOL_NAME(base_trap_init)
 
/* jump to the kernel start */
 
        putc    '\n'
        leds    0x55
 
        jbsr    SYMBOL_NAME(start_kernel)
 
/*
 * Find a tag record in the bootinfo structure
 * The bootinfo structure is located right after the kernel bss
 * Returns: d0: size (-1 if not found)
 *          a0: data pointer (end-of-records if not found)
 */
func_start      get_bi_record,%d1
 
        movel   ARG1,%d0
        lea     %pc@(SYMBOL_NAME(_end)),%a0
#ifndef CONFIG_HP300
1:      tstw    %a0@(BIR_TAG)
        jeq     3f
        cmpw    %a0@(BIR_TAG),%d0
        jeq     2f
        addw    %a0@(BIR_SIZE),%a0
        jra     1b
2:      moveq   #0,%d0
        movew   %a0@(BIR_SIZE),%d0
        lea     %a0@(BIR_DATA),%a0
        jra     4f
3:      moveq   #-1,%d0
        lea     %a0@(BIR_SIZE),%a0
4:
#endif /* CONFIG_HP300 */
func_return     get_bi_record
 
 
/*
 *      MMU Initialization Begins Here
 *
 *      The structure of the MMU tables on the 68k machines
 *      is thus:
 *      Root Table
 *              Logical addresses are translated through
 *      a hierarchical translation mechanism where the high-order
 *      seven bits of the logical address (LA) are used as an
 *      index into the "root table."  Each entry in the root
 *      table has a bit which specifies if it's a valid pointer to a
 *      pointer table.  Each entry defines a 32KMeg range of memory.
 *      If an entry is invalid then that logical range of 32M is
 *      invalid and references to that range of memory (when the MMU
 *      is enabled) will fault.  If the entry is valid, then it does
 *      one of two things.  On 040/060 class machines, it points to
 *      a pointer table which then describes more finely the memory
 *      within that 32M range.  On 020/030 class machines, a technique
 *      called "early terminating descriptors" are used.  This technique
 *      allows an entire 32Meg to be described by a single entry in the
 *      root table.  Thus, this entry in the root table, contains the
 *      physical address of the memory or I/O at the logical address
 *      which the entry represents and it also contains the necessary
 *      cache bits for this region.
 *
 *      Pointer Tables
 *              Per the Root Table, there will be one or more
 *      pointer tables.  Each pointer table defines a 32M range.
 *      Not all of the 32M range need be defined.  Again, the next
 *      seven bits of the logical address are used an index into
 *      the pointer table to point to page tables (if the pointer
 *      is valid).  There will undoubtedly be more than one
 *      pointer table for the kernel because each pointer table
 *      defines a range of only 32M.  Valid pointer table entries
 *      point to page tables, or are early terminating entries
 *      themselves.
 *
 *      Page Tables
 *              Per the Pointer Tables, each page table entry points
 *      to the physical page in memory that supports the logical
 *      address that translates to the particular index.
 *
 *      In short, the Logical Address gets translated as follows:
 *              bits 31..26 - index into the Root Table
 *              bits 25..18 - index into the Pointer Table
 *              bits 17..12 - index into the Page Table
 *              bits 11..0  - offset into a particular 4K page
 *
 *      The algorithms which follows do one thing: they abstract
 *      the MMU hardware.  For example, there are three kinds of
 *      cache settings that are relevant.  Either, memory is
 *      being mapped in which case it is either Kernel Code (or
 *      the RamDisk) or it is MMU data.  On the 030, the MMU data
 *      option also describes the kernel.  Or, I/O is being mapped
 *      in which case it has its own kind of cache bits.  There
 *      are constants which abstract these notions from the code that
 *      actually makes the call to map some range of memory.
 *
 *
 *
 */
 
#ifdef MMU_PRINT
/*
 *      mmu_print
 *
 *      This algorithm will print out the current MMU mappings.
 *
 *      Input:
 *              %a5 points to the root table.  Everything else is calculated
 *                      from this.
 */
 
#define mmu_next_valid          0
#define mmu_start_logical       4
#define mmu_next_logical        8
#define mmu_start_physical      12
#define mmu_next_physical       16
 
#define MMU_PRINT_INVALID               -1
#define MMU_PRINT_VALID                 1
#define MMU_PRINT_UNINITED              0
 
#define putZc(z,n)              jbne 1f; putc z; jbra 2f; 1: putc n; 2:
 
func_start      mmu_print,%a0-%a6/%d0-%d7
 
        movel   %pc@(L(kernel_pgdir_ptr)),%a5
        lea     %pc@(L(mmu_print_data)),%a0
        movel   #MMU_PRINT_UNINITED,%a0@(mmu_next_valid)
 
        is_not_040_or_060(mmu_030_print)
 
mmu_040_print:
        puts    "\nMMU040\n"
        puts    "rp:"
        putn    %a5
        putc    '\n'
#if 0
        /*
         * The following #if/#endif block is a tight algorithm for dumping the 040
         * MMU Map in gory detail.  It really isn't that practical unless the
         * MMU Map algorithm appears to go awry and you need to debug it at the
         * entry per entry level.
         */
        movel   #ROOT_TABLE_SIZE,%d5
#if 0
        movel   %a5@+,%d7               | Burn an entry to skip the kernel mappings,
        subql   #1,%d5                  | they (might) work
#endif
1:      tstl    %d5
        jbeq    mmu_print_done
        subq    #1,%d5
        movel   %a5@+,%d7
        btst    #1,%d7
        jbeq    1b
 
2:      putn    %d7
        andil   #0xFFFFFE00,%d7
        movel   %d7,%a4
        movel   #PTR_TABLE_SIZE,%d4
        putc    ' '
3:      tstl    %d4
        jbeq    11f
        subq    #1,%d4
        movel   %a4@+,%d7
        btst    #1,%d7
        jbeq    3b
 
4:      putn    %d7
        andil   #0xFFFFFF00,%d7
        movel   %d7,%a3
        movel   #PAGE_TABLE_SIZE,%d3
5:      movel   #8,%d2
6:      tstl    %d3
        jbeq    31f
        subq    #1,%d3
        movel   %a3@+,%d6
        btst    #0,%d6
        jbeq    6b
7:      tstl    %d2
        jbeq    8f
        subq    #1,%d2
        putc    ' '
        jbra    91f
8:      putc    '\n'
        movel   #8+1+8+1+1,%d2
9:      putc    ' '
        dbra    %d2,9b
        movel   #7,%d2
91:     putn    %d6
        jbra    6b
 
31:     putc    '\n'
        movel   #8+1,%d2
32:     putc    ' '
        dbra    %d2,32b
        jbra    3b
 
11:     putc    '\n'
        jbra    1b
#endif /* MMU 040 Dumping code that's gory and detailed */
 
        lea     %pc@(SYMBOL_NAME(kernel_pg_dir)),%a5
        movel   %a5,%a0                 /* a0 has the address of the root table ptr */
        movel   #0x00000000,%a4         /* logical address */
        moveql  #0,%d0
40:
        /* Increment the logical address and preserve in d5 */
        movel   %a4,%d5
        addil   #PAGESIZE<<13,%d5
        movel   %a0@+,%d6
        btst    #1,%d6
        jbne    41f
        jbsr    mmu_print_tuple_invalidate
        jbra    48f
41:
        movel   #0,%d1
        andil   #0xfffffe00,%d6
        movel   %d6,%a1
42:
        movel   %a4,%d5
        addil   #PAGESIZE<<6,%d5
        movel   %a1@+,%d6
        btst    #1,%d6
        jbne    43f
        jbsr    mmu_print_tuple_invalidate
        jbra    47f
43:
        movel   #0,%d2
        andil   #0xffffff00,%d6
        movel   %d6,%a2
44:
        movel   %a4,%d5
        addil   #PAGESIZE,%d5
        movel   %a2@+,%d6
        btst    #0,%d6
        jbne    45f
        jbsr    mmu_print_tuple_invalidate
        jbra    46f
45:
        moveml  %d0-%d1,%sp@-
        movel   %a4,%d0
        movel   %d6,%d1
        andil   #0xfffff4e0,%d1
        lea     %pc@(mmu_040_print_flags),%a6
        jbsr    mmu_print_tuple
        moveml  %sp@+,%d0-%d1
46:
        movel   %d5,%a4
        addq    #1,%d2
        cmpib   #64,%d2
        jbne    44b
47:
        movel   %d5,%a4
        addq    #1,%d1
        cmpib   #128,%d1
        jbne    42b
48:
        movel   %d5,%a4                 /* move to the next logical address */
        addq    #1,%d0
        cmpib   #128,%d0
        jbne    40b
 
        .chip   68040
        movec   %dtt1,%d0
        movel   %d0,%d1
        andiw   #0x8000,%d1             /* is it valid ? */
        jbeq    1f                      /* No, bail out */
 
        movel   %d0,%d1
        andil   #0xff000000,%d1         /* Get the address */
        putn    %d1
        puts    "=="
        putn    %d1
 
        movel   %d0,%d6
        jbsr    mmu_040_print_flags_tt
1:
        movec   %dtt0,%d0
        movel   %d0,%d1
        andiw   #0x8000,%d1             /* is it valid ? */
        jbeq    1f                      /* No, bail out */
 
        movel   %d0,%d1
        andil   #0xff000000,%d1         /* Get the address */
        putn    %d1
        puts    "=="
        putn    %d1
 
        movel   %d0,%d6
        jbsr    mmu_040_print_flags_tt
1:
        .chip   68k
 
        jbra    mmu_print_done
 
mmu_040_print_flags:
        btstl   #10,%d6
        putZc(' ','G')  /* global bit */
        btstl   #7,%d6
        putZc(' ','S')  /* supervisor bit */
mmu_040_print_flags_tt:
        btstl   #6,%d6
        jbne    3f
        putc    'C'
        btstl   #5,%d6
        putZc('w','c')  /* write through or copy-back */
        jbra    4f
3:
        putc    'N'
        btstl   #5,%d6
        putZc('s',' ')  /* serialized non-cacheable, or non-cacheable */
4:
        rts
 
mmu_030_print_flags:
        btstl   #6,%d6
        putZc('C','I')  /* write through or copy-back */
        rts
 
mmu_030_print:
        puts    "\nMMU030\n"
        puts    "\nrp:"
        putn    %a5
        putc    '\n'
        movel   %a5,%d0
        andil   #0xfffffff0,%d0
        movel   %d0,%a0
        movel   #0x00000000,%a4         /* logical address */
        movel   #0,%d0
30:
        movel   %a4,%d5
        addil   #PAGESIZE<<13,%d5
        movel   %a0@+,%d6
        btst    #1,%d6                  /* is it a ptr? */
        jbne    31f                     /* yes */
        btst    #0,%d6                  /* is it early terminating? */
        jbeq    1f                      /* no */
        jbsr    mmu_030_print_helper
        jbra    38f
1:
        jbsr    mmu_print_tuple_invalidate
        jbra    38f
31:
        movel   #0,%d1
        andil   #0xfffffff0,%d6
        movel   %d6,%a1
32:
        movel   %a4,%d5
        addil   #PAGESIZE<<6,%d5
        movel   %a1@+,%d6
        btst    #1,%d6
        jbne    33f
        btst    #0,%d6
        jbeq    1f                      /* no */
        jbsr    mmu_030_print_helper
        jbra    37f
1:
        jbsr    mmu_print_tuple_invalidate
        jbra    37f
33:
        movel   #0,%d2
        andil   #0xfffffff0,%d6
        movel   %d6,%a2
34:
        movel   %a4,%d5
        addil   #PAGESIZE,%d5
        movel   %a2@+,%d6
        btst    #0,%d6
        jbne    35f
        jbsr    mmu_print_tuple_invalidate
        jbra    36f
35:
        jbsr    mmu_030_print_helper
36:
        movel   %d5,%a4
        addq    #1,%d2
        cmpib   #64,%d2
        jbne    34b
37:
        movel   %d5,%a4
        addq    #1,%d1
        cmpib   #128,%d1
        jbne    32b
38:
        movel   %d5,%a4                 /* move to the next logical address */
        addq    #1,%d0
        cmpib   #128,%d0
        jbne    30b
 
mmu_print_done:
        puts    "\n\n"
 
func_return     mmu_print
 
 
mmu_030_print_helper:
        moveml  %d0-%d1,%sp@-
        movel   %a4,%d0
        movel   %d6,%d1
        lea     %pc@(mmu_030_print_flags),%a6
        jbsr    mmu_print_tuple
        moveml  %sp@+,%d0-%d1
        rts
 
mmu_print_tuple_invalidate:
        moveml  %a0/%d7,%sp@-
 
        lea     %pc@(L(mmu_print_data)),%a0
        tstl    %a0@(mmu_next_valid)
        jbmi    mmu_print_tuple_invalidate_exit
 
        movel   #MMU_PRINT_INVALID,%a0@(mmu_next_valid)
 
        putn    %a4
 
        puts    "##\n"
 
mmu_print_tuple_invalidate_exit:
        moveml  %sp@+,%a0/%d7
        rts
 
 
mmu_print_tuple:
        moveml  %d0-%d7/%a0,%sp@-
 
        lea     %pc@(L(mmu_print_data)),%a0
 
        tstl    %a0@(mmu_next_valid)
        jble    mmu_print_tuple_print
 
        cmpl    %a0@(mmu_next_physical),%d1
        jbeq    mmu_print_tuple_increment
 
mmu_print_tuple_print:
        putn    %d0
        puts    "->"
        putn    %d1
 
        movel   %d1,%d6
        jbsr    %a6@
 
mmu_print_tuple_record:
        movel   #MMU_PRINT_VALID,%a0@(mmu_next_valid)
 
        movel   %d1,%a0@(mmu_next_physical)
 
mmu_print_tuple_increment:
        movel   %d5,%d7
        subl    %a4,%d7
        addl    %d7,%a0@(mmu_next_physical)
 
mmu_print_tuple_exit:
        moveml  %sp@+,%d0-%d7/%a0
        rts
 
mmu_print_machine_cpu_types:
        puts    "machine: "
 
        is_not_amiga(1f)
        puts    "amiga"
        jbra    9f
1:
        is_not_atari(2f)
        puts    "atari"
        jbra    9f
2:
        is_not_mac(3f)
        puts    "macintosh"
        jbra    9f
3:      puts    "unknown"
9:      putc    '\n'
 
        puts    "cputype: 0"
        is_not_060(1f)
        putc    '6'
        jbra    9f
1:
        is_not_040_or_060(2f)
        putc    '4'
        jbra    9f
2:      putc    '3'
9:      putc    '0'
        putc    '\n'
 
        rts
#endif /* MMU_PRINT */
 
/*
 * mmu_map_tt
 *
 * This is a specific function which works on all 680x0 machines.
 * On 030, 040 & 060 it will attempt to use Transparent Translation
 * registers (tt1).
 * On 020 it will call the standard mmu_map which will use early
 * terminating descriptors.
 */
func_start      mmu_map_tt,%d0/%d1/%a0,4
 
        dputs   "mmu_map_tt:"
        dputn   ARG1
        dputn   ARG2
        dputn   ARG3
        dputn   ARG4
        dputc   '\n'
 
        is_020(L(do_map))
 
        /* Extract the highest bit set
         */
        bfffo   ARG3{#0,#32},%d1
        cmpw    #8,%d1
        jcc     L(do_map)
 
        /* And get the mask
         */
        moveq   #-1,%d0
        lsrl    %d1,%d0
        lsrl    #1,%d0
 
        /* Mask the address
         */
        movel   %d0,%d1
        notl    %d1
        andl    ARG2,%d1
 
        /* Generate the upper 16bit of the tt register
         */
        lsrl    #8,%d0
        orl     %d0,%d1
        clrw    %d1
 
        is_040_or_060(L(mmu_map_tt_040))
 
        /* set 030 specific bits (read/write access for supervisor mode
         * (highest function code set, lower two bits masked))
         */
        orw     #TTR_ENABLE+TTR_RWM+TTR_FCB2+TTR_FCM1+TTR_FCM0,%d1
        movel   ARG4,%d0
        btst    #6,%d0
        jeq     1f
        orw     #TTR_CI,%d1
 
1:      lea     STACK,%a0
        dputn   %d1
        movel   %d1,%a0@
        .chip   68030
        tstl    ARG1
        jne     1f
        pmove   %a0@,%tt0
        jra     2f
1:      pmove   %a0@,%tt1
2:      .chip   68k
        jra     L(mmu_map_tt_done)
 
        /* set 040 specific bits
         */
L(mmu_map_tt_040):
        orw     #TTR_ENABLE+TTR_KERNELMODE,%d1
        orl     ARG4,%d1
        dputn   %d1
 
        .chip   68040
        tstl    ARG1
        jne     1f
        movec   %d1,%itt0
        movec   %d1,%dtt0
        jra     2f
1:      movec   %d1,%itt1
        movec   %d1,%dtt1
2:      .chip   68k
 
        jra     L(mmu_map_tt_done)
 
L(do_map):
        mmu_map_eq      ARG2,ARG3,ARG4
 
L(mmu_map_tt_done):
 
func_return     mmu_map_tt
 
/*
 *      mmu_map
 *
 *      This routine will map a range of memory using a pointer
 *      table and allocating the pages on the fly from the kernel.
 *      The pointer table does not have to be already linked into
 *      the root table, this routine will do that if necessary.
 *
 *      NOTE
 *      This routine will assert failure and use the serial_putc
 *      routines in the case of a run-time error.  For example,
 *      if the address is already mapped.
 *
 *      NOTE-2
 *      This routine will use early terminating descriptors
 *      where possible for the 68020+68851 and 68030 type
 *      processors.
 */
func_start      mmu_map,%d0-%d4/%a0-%a4
 
        dputs   "\nmmu_map:"
        dputn   ARG1
        dputn   ARG2
        dputn   ARG3
        dputn   ARG4
        dputc   '\n'
 
        /* Get logical address and round it down to 256KB
         */
        movel   ARG1,%d0
        andl    #-(PAGESIZE*PAGE_TABLE_SIZE),%d0
        movel   %d0,%a3
 
        /* Get the end address
         */
        movel   ARG1,%a4
        addl    ARG3,%a4
        subql   #1,%a4
 
        /* Get physical address and round it down to 256KB
         */
        movel   ARG2,%d0
        andl    #-(PAGESIZE*PAGE_TABLE_SIZE),%d0
        movel   %d0,%a2
 
        /* Add page attributes to the physical address
         */
        movel   ARG4,%d0
        orw     #_PAGE_PRESENT+_PAGE_ACCESSED+_PAGE_DIRTY,%d0
        addw    %d0,%a2
 
        dputn   %a2
        dputn   %a3
        dputn   %a4
 
        is_not_040_or_060(L(mmu_map_030))
 
        addw    #_PAGE_GLOBAL040,%a2
/*
 *      MMU 040 & 060 Support
 *
 *      The MMU usage for the 040 and 060 is different enough from
 *      the 030 and 68851 that there is separate code.  This comment
 *      block describes the data structures and algorithms built by
 *      this code.
 *
 *      The 040 does not support early terminating descriptors, as
 *      the 030 does.  Therefore, a third level of table is needed
 *      for the 040, and that would be the page table.  In Linux,
 *      page tables are allocated directly from the memory above the
 *      kernel.
 *
 */
 
L(mmu_map_040):
        /* Calculate the offset into the root table
         */
        movel   %a3,%d0
        moveq   #ROOT_INDEX_SHIFT,%d1
        lsrl    %d1,%d0
        mmu_get_root_table_entry        %d0
 
        /* Calculate the offset into the pointer table
         */
        movel   %a3,%d0
        moveq   #PTR_INDEX_SHIFT,%d1
        lsrl    %d1,%d0
        andl    #PTR_TABLE_SIZE-1,%d0
        mmu_get_ptr_table_entry         %a0,%d0
 
        /* Calculate the offset into the page table
         */
        movel   %a3,%d0
        moveq   #PAGE_INDEX_SHIFT,%d1
        lsrl    %d1,%d0
        andl    #PAGE_TABLE_SIZE-1,%d0
        mmu_get_page_table_entry        %a0,%d0
 
        /* The page table entry must not no be busy
         */
        tstl    %a0@
        jne     L(mmu_map_error)
 
        /* Do the mapping and advance the pointers
         */
        movel   %a2,%a0@
2:
        addw    #PAGESIZE,%a2
        addw    #PAGESIZE,%a3
 
        /* Ready with mapping?
         */
        lea     %a3@(-1),%a0
        cmpl    %a0,%a4
        jhi     L(mmu_map_040)
        jra     L(mmu_map_done)
 
L(mmu_map_030):
        /* Calculate the offset into the root table
         */
        movel   %a3,%d0
        moveq   #ROOT_INDEX_SHIFT,%d1
        lsrl    %d1,%d0
        mmu_get_root_table_entry        %d0
 
        /* Check if logical address 32MB aligned,
         * so we can try to map it once
         */
        movel   %a3,%d0
        andl    #(PTR_TABLE_SIZE*PAGE_TABLE_SIZE*PAGESIZE-1)&(-ROOT_TABLE_SIZE),%d0
        jne     1f
 
        /* Is there enough to map for 32MB at once
         */
        lea     %a3@(PTR_TABLE_SIZE*PAGE_TABLE_SIZE*PAGESIZE-1),%a1
        cmpl    %a1,%a4
        jcs     1f
 
        addql   #1,%a1
 
        /* The root table entry must not no be busy
         */
        tstl    %a0@
        jne     L(mmu_map_error)
 
        /* Do the mapping and advance the pointers
         */
        dputs   "early term1"
        dputn   %a2
        dputn   %a3
        dputn   %a1
        dputc   '\n'
        movel   %a2,%a0@
 
        movel   %a1,%a3
        lea     %a2@(PTR_TABLE_SIZE*PAGE_TABLE_SIZE*PAGESIZE),%a2
        jra     L(mmu_mapnext_030)
1:
        /* Calculate the offset into the pointer table
         */
        movel   %a3,%d0
        moveq   #PTR_INDEX_SHIFT,%d1
        lsrl    %d1,%d0
        andl    #PTR_TABLE_SIZE-1,%d0
        mmu_get_ptr_table_entry         %a0,%d0
 
        /* The pointer table entry must not no be busy
         */
        tstl    %a0@
        jne     L(mmu_map_error)
 
        /* Do the mapping and advance the pointers
         */
        dputs   "early term2"
        dputn   %a2
        dputn   %a3
        dputc   '\n'
        movel   %a2,%a0@
 
        addl    #PAGE_TABLE_SIZE*PAGESIZE,%a2
        addl    #PAGE_TABLE_SIZE*PAGESIZE,%a3
 
L(mmu_mapnext_030):
        /* Ready with mapping?
         */
        lea     %a3@(-1),%a0
        cmpl    %a0,%a4
        jhi     L(mmu_map_030)
        jra     L(mmu_map_done)
 
L(mmu_map_error):
 
        dputs   "mmu_map error:"
        dputn   %a2
        dputn   %a3
        dputc   '\n'
 
L(mmu_map_done):
 
func_return     mmu_map
 
/*
 *      mmu_fixup
 *
 *      On the 040 class machines, all pages that are used for the
 *      mmu have to be fixed up.
 */
 
func_start      mmu_fixup_page_mmu_cache,%d0/%a0
 
        dputs   "mmu_fixup_page_mmu_cache"
        dputn   ARG1
 
        /* Calculate the offset into the root table
         */
        movel   ARG1,%d0
        moveq   #ROOT_INDEX_SHIFT,%d1
        lsrl    %d1,%d0
        mmu_get_root_table_entry        %d0
 
        /* Calculate the offset into the pointer table
         */
        movel   ARG1,%d0
        moveq   #PTR_INDEX_SHIFT,%d1
        lsrl    %d1,%d0
        andl    #PTR_TABLE_SIZE-1,%d0
        mmu_get_ptr_table_entry         %a0,%d0
 
        /* Calculate the offset into the page table
         */
        movel   ARG1,%d0
        moveq   #PAGE_INDEX_SHIFT,%d1
        lsrl    %d1,%d0
        andl    #PAGE_TABLE_SIZE-1,%d0
        mmu_get_page_table_entry        %a0,%d0
 
        movel   %a0@,%d0
        andil   #_CACHEMASK040,%d0
        orl     %pc@(SYMBOL_NAME(m68k_pgtable_cachemode)),%d0
        movel   %d0,%a0@
 
        dputc   '\n'
 
func_return     mmu_fixup_page_mmu_cache
 
/*
 *      mmu_temp_map
 *
 *      create a temporary mapping to enable the mmu,
 *      this we don't need any transparation translation tricks.
 */
 
func_start      mmu_temp_map,%d0/%d1/%a0/%a1
 
        dputs   "mmu_temp_map"
        dputn   ARG1
        dputn   ARG2
        dputc   '\n'
 
        lea     %pc@(L(temp_mmap_mem)),%a1
 
        /* Calculate the offset in the root table
         */
        movel   ARG2,%d0
        moveq   #ROOT_INDEX_SHIFT,%d1
        lsrl    %d1,%d0
        mmu_get_root_table_entry        %d0
 
        /* Check if the table is temporary allocated, so we have to reuse it
         */
        movel   %a0@,%d0
        cmpl    %pc@(L(memory_start)),%d0
        jcc     1f
 
        /* Temporary allocate a ptr table and insert it into the root table
         */
        movel   %a1@,%d0
        addl    #PTR_TABLE_SIZE*4,%a1@
        orw     #_PAGE_TABLE+_PAGE_ACCESSED,%d0
        movel   %d0,%a0@
        dputs   " (new)"
1:
        dputn   %d0
        /* Mask the root table entry for the ptr table
         */
        andw    #-ROOT_TABLE_SIZE,%d0
        movel   %d0,%a0
 
        /* Calculate the offset into the pointer table
         */
        movel   ARG2,%d0
        moveq   #PTR_INDEX_SHIFT,%d1
        lsrl    %d1,%d0
        andl    #PTR_TABLE_SIZE-1,%d0
        lea     %a0@(%d0*4),%a0
        dputn   %a0
 
        /* Check if a temporary page table is already allocated
         */
        movel   %a0@,%d0
        jne     1f
 
        /* Temporary allocate a page table and insert it into the ptr table
         */
        movel   %a1@,%d0
        /* The 512 should be PAGE_TABLE_SIZE*4, but that violates the
           alignment restriction for pointer tables on the '0[46]0.  */
        addl    #512,%a1@
        orw     #_PAGE_TABLE+_PAGE_ACCESSED,%d0
        movel   %d0,%a0@
        dputs   " (new)"
1:
        dputn   %d0
        /* Mask the ptr table entry for the page table
         */
        andw    #-PTR_TABLE_SIZE,%d0
        movel   %d0,%a0
 
        /* Calculate the offset into the page table
         */
        movel   ARG2,%d0
        moveq   #PAGE_INDEX_SHIFT,%d1
        lsrl    %d1,%d0
        andl    #PAGE_TABLE_SIZE-1,%d0
        lea     %a0@(%d0*4),%a0
        dputn   %a0
 
        /* Insert the address into the page table
         */
        movel   ARG1,%d0
        andw    #-PAGESIZE,%d0
        orw     #_PAGE_PRESENT+_PAGE_ACCESSED+_PAGE_DIRTY,%d0
        movel   %d0,%a0@
        dputn   %d0
 
        dputc   '\n'
 
func_return     mmu_temp_map
 
func_start      mmu_engage,%d0-%d2/%a0-%a3
 
        moveq   #ROOT_TABLE_SIZE-1,%d0
        /* Temporarily use a different root table.  */
        lea     %pc@(L(kernel_pgdir_ptr)),%a0
        movel   %a0@,%a2
        movel   %pc@(L(memory_start)),%a1
        movel   %a1,%a0@
        movel   %a2,%a0
1:
        movel   %a0@+,%a1@+
        dbra    %d0,1b
 
        lea     %pc@(L(temp_mmap_mem)),%a0
        movel   %a1,%a0@
 
        movew   #PAGESIZE-1,%d0
1:
        clrl    %a1@+
        dbra    %d0,1b
 
        lea     %pc@(1b),%a0
        movel   #1b,%a1
        /* Skip temp mappings if phys == virt */
        cmpl    %a0,%a1
        jeq     1f
 
        mmu_temp_map    %a0,%a0
        mmu_temp_map    %a0,%a1
 
        addw    #PAGESIZE,%a0
        addw    #PAGESIZE,%a1
        mmu_temp_map    %a0,%a0
        mmu_temp_map    %a0,%a1
1:
        movel   %pc@(L(memory_start)),%a3
        movel   %pc@(L(phys_kernel_start)),%d2
 
        is_not_040_or_060(L(mmu_engage_030))
 
L(mmu_engage_040):
        .chip   68040
        nop
        cinva   %bc
        nop
        pflusha
        nop
        movec   %a3,%srp
        movel   #TC_ENABLE+TC_PAGE4K,%d0
        movec   %d0,%tc         /* enable the MMU */
        jmp     1f:l
1:      nop
        movec   %a2,%srp
        nop
        cinva   %bc
        nop
        pflusha
        .chip   68k
        jra     L(mmu_engage_cleanup)
 
L(mmu_engage_030_temp):
        .space  12
L(mmu_engage_030):
        .chip   68030
        lea     %pc@(L(mmu_engage_030_temp)),%a0
        movel   #0x80000002,%a0@
        movel   %a3,%a0@(4)
        movel   #0x0808,%d0
        movec   %d0,%cacr
        pmove   %a0@,%srp
        pflusha
        /*
         * enable,super root enable,4096 byte pages,7 bit root index,
         * 7 bit pointer index, 6 bit page table index.
         */
        movel   #0x82c07760,%a0@(8)
        pmove   %a0@(8),%tc     /* enable the MMU */
        jmp     1f:l
1:      movel   %a2,%a0@(4)
        movel   #0x0808,%d0
        movec   %d0,%cacr
        pmove   %a0@,%srp
        pflusha
        .chip   68k
 
L(mmu_engage_cleanup):
        subl    #PAGE_OFFSET,%d2
        subl    %d2,%a2
        movel   %a2,L(kernel_pgdir_ptr)
        subl    %d2,%fp
        subl    %d2,%sp
        subl    %d2,ARG0
 
func_return     mmu_engage
 
func_start      mmu_get_root_table_entry,%d0/%a1
 
#if 0
        dputs   "mmu_get_root_table_entry:"
        dputn   ARG1
        dputs   " ="
#endif
 
        movel   %pc@(L(kernel_pgdir_ptr)),%a0
        tstl    %a0
        jne     2f
 
        dputs   "\nmmu_init:"
 
        /* Find the start of free memory, get_bi_record does this for us,
         * as the bootinfo structure is located directly behind the kernel
         * and and we simply search for the last entry.
         */
        get_bi_record   BI_LAST
        addw    #PAGESIZE-1,%a0
        movel   %a0,%d0
        andw    #-PAGESIZE,%d0
 
        dputn   %d0
 
        lea     %pc@(L(memory_start)),%a0
        movel   %d0,%a0@
        lea     %pc@(L(kernel_end)),%a0
        movel   %d0,%a0@
 
        /* we have to return the first page at _stext since the init code
         * in mm/init.c simply expects kernel_pg_dir there, the rest of
         * page is used for further ptr tables in get_ptr_table.
         */
        lea     %pc@(SYMBOL_NAME(_stext)),%a0
        lea     %pc@(L(mmu_cached_pointer_tables)),%a1
        movel   %a0,%a1@
        addl    #ROOT_TABLE_SIZE*4,%a1@
 
        lea     %pc@(L(mmu_num_pointer_tables)),%a1
        addql   #1,%a1@
 
        /* clear the page
         */
        movel   %a0,%a1
        movew   #PAGESIZE/4-1,%d0
1:
        clrl    %a1@+
        dbra    %d0,1b
 
        lea     %pc@(L(kernel_pgdir_ptr)),%a1
        movel   %a0,%a1@
 
        dputn   %a0
        dputc   '\n'
2:
        movel   ARG1,%d0
        lea     %a0@(%d0*4),%a0
 
#if 0
        dputn   %a0
        dputc   '\n'
#endif
 
func_return     mmu_get_root_table_entry
 
 
 
func_start      mmu_get_ptr_table_entry,%d0/%a1
 
#if 0
        dputs   "mmu_get_ptr_table_entry:"
        dputn   ARG1
        dputn   ARG2
        dputs   " ="
#endif
 
        movel   ARG1,%a0
        movel   %a0@,%d0
        jne     2f
 
        /* Keep track of the number of pointer tables we use
         */
        dputs   "\nmmu_get_new_ptr_table:"
        lea     %pc@(L(mmu_num_pointer_tables)),%a0
        movel   %a0@,%d0
        addql   #1,%a0@
 
        /* See if there is a free pointer table in our cache of pointer tables
         */
        lea     %pc@(L(mmu_cached_pointer_tables)),%a1
        andw    #7,%d0
        jne     1f
 
        /* Get a new pointer table page from above the kernel memory
         */
        get_new_page
        movel   %a0,%a1@
1:
        /* There is an unused pointer table in our cache... use it
         */
        movel   %a1@,%d0
        addl    #PTR_TABLE_SIZE*4,%a1@
 
        dputn   %d0
        dputc   '\n'
 
        /* Insert the new pointer table into the root table
         */
        movel   ARG1,%a0
        orw     #_PAGE_TABLE+_PAGE_ACCESSED,%d0
        movel   %d0,%a0@
2:
        /* Extract the pointer table entry
         */
        andw    #-PTR_TABLE_SIZE,%d0
        movel   %d0,%a0
        movel   ARG2,%d0
        lea     %a0@(%d0*4),%a0
 
#if 0
        dputn   %a0
        dputc   '\n'
#endif
 
func_return     mmu_get_ptr_table_entry
 
 
func_start      mmu_get_page_table_entry,%d0/%a1
 
#if 0
        dputs   "mmu_get_page_table_entry:"
        dputn   ARG1
        dputn   ARG2
        dputs   " ="
#endif
 
        movel   ARG1,%a0
        movel   %a0@,%d0
        jne     2f
 
        /* If the page table entry doesn't exist, we allocate a complete new
         * page and use it as one continues big page table which can cover
         * 4MB of memory, nearly almost all mappings have that alignment.
         */
        get_new_page
        addw    #_PAGE_TABLE+_PAGE_ACCESSED,%a0
 
        /* align pointer table entry for a page of page tables
         */
        movel   ARG1,%d0
        andw    #-(PAGESIZE/PAGE_TABLE_SIZE),%d0
        movel   %d0,%a1
 
        /* Insert the page tables into the pointer entries
         */
        moveq   #PAGESIZE/PAGE_TABLE_SIZE/4-1,%d0
1:
        movel   %a0,%a1@+
        lea     %a0@(PAGE_TABLE_SIZE*4),%a0
        dbra    %d0,1b
 
        /* Now we can get the initialized pointer table entry
         */
        movel   ARG1,%a0
        movel   %a0@,%d0
2:
        /* Extract the page table entry
         */
        andw    #-PAGE_TABLE_SIZE,%d0
        movel   %d0,%a0
        movel   ARG2,%d0
        lea     %a0@(%d0*4),%a0
 
#if 0
        dputn   %a0
        dputc   '\n'
#endif
 
func_return     mmu_get_page_table_entry
 
/*
 *      get_new_page
 *
 *      Return a new page from the memory start and clear it.
 */
func_start      get_new_page,%d0/%a1
 
        dputs   "\nget_new_page:"
 
        /* allocate the page and adjust memory_start
         */
        lea     %pc@(L(memory_start)),%a0
        movel   %a0@,%a1
        addl    #PAGESIZE,%a0@
 
        /* clear the new page
         */
        movel   %a1,%a0
        movew   #PAGESIZE/4-1,%d0
1:
        clrl    %a1@+
        dbra    %d0,1b
 
        dputn   %a0
        dputc   '\n'
 
func_return     get_new_page
 
 
 
/*
 * Debug output support
 * Atarians have a choice between the parallel port, the serial port
 * from the MFP or a serial port of the SCC
 */
 
#ifdef CONFIG_MAC
 
L(scc_initable_mac):
        .byte   9,12            /* Reset */
        .byte   4,0x44          /* x16, 1 stopbit, no parity */
        .byte   3,0xc0          /* receiver: 8 bpc */
        .byte   5,0xe2          /* transmitter: 8 bpc, assert dtr/rts */
        .byte   9,0             /* no interrupts */
        .byte   10,0            /* NRZ */
        .byte   11,0x50         /* use baud rate generator */
        .byte   12,10,13,0      /* 9600 baud */
        .byte   14,1            /* Baud rate generator enable */
        .byte   3,0xc1          /* enable receiver */
        .byte   5,0xea          /* enable transmitter */
        .byte   -1
        .even
#endif
 
#ifdef CONFIG_ATARI
/* #define USE_PRINTER */
/* #define USE_SCC_B */
/* #define USE_SCC_A */
#define USE_MFP
 
#if defined(USE_SCC_A) || defined(USE_SCC_B)
#define USE_SCC
/* Initialisation table for SCC */
L(scc_initable):
        .byte   9,12            /* Reset */
        .byte   4,0x44          /* x16, 1 stopbit, no parity */
        .byte   3,0xc0          /* receiver: 8 bpc */
        .byte   5,0xe2          /* transmitter: 8 bpc, assert dtr/rts */
        .byte   9,0             /* no interrupts */
        .byte   10,0            /* NRZ */
        .byte   11,0x50         /* use baud rate generator */
        .byte   12,24,13,0      /* 9600 baud */
        .byte   14,2,14,3       /* use master clock for BRG, enable */
        .byte   3,0xc1          /* enable receiver */
        .byte   5,0xea          /* enable transmitter */
        .byte   -1
        .even
#endif
 
#ifdef USE_PRINTER
 
LPSG_SELECT     = 0xff8800
LPSG_READ       = 0xff8800
LPSG_WRITE      = 0xff8802
LPSG_IO_A       = 14
LPSG_IO_B       = 15
LPSG_CONTROL    = 7
LSTMFP_GPIP     = 0xfffa01
LSTMFP_DDR      = 0xfffa05
LSTMFP_IERB     = 0xfffa09
 
#elif defined(USE_SCC_B)
 
LSCC_CTRL       = 0xff8c85
LSCC_DATA       = 0xff8c87
 
#elif defined(USE_SCC_A)
 
LSCC_CTRL       = 0xff8c81
LSCC_DATA       = 0xff8c83
 
/* Initialisation table for SCC */
L(scc_initable):
        .byte   9,12            /* Reset */
        .byte   4,0x44          /* x16, 1 stopbit, no parity */
        .byte   3,0xc0          /* receiver: 8 bpc */
        .byte   5,0xe2          /* transmitter: 8 bpc, assert dtr/rts */
        .byte   9,0             /* no interrupts */
        .byte   10,0            /* NRZ */
        .byte   11,0x50         /* use baud rate generator */
        .byte   12,24,13,0      /* 9600 baud */
        .byte   14,2,14,3       /* use master clock for BRG, enable */
        .byte   3,0xc1          /* enable receiver */
        .byte   5,0xea          /* enable transmitter */
        .byte   -1
        .even
 
#elif defined(USE_MFP)
 
LMFP_UCR     = 0xfffa29
LMFP_TDCDR   = 0xfffa1d
LMFP_TDDR    = 0xfffa25
LMFP_TSR     = 0xfffa2d
LMFP_UDR     = 0xfffa2f
 
#endif
#endif  /* CONFIG_ATARI */
 
/*
 * Serial port output support.
 */
 
/*
 * Initialize serial port hardware for 9600/8/1
 */
func_start      serial_init,%d0/%d1/%a0/%a1
        /*
         *      Some of the register usage that follows
         *      CONFIG_AMIGA
         *              a0 = pointer to boot info record
         *              d0 = boot info offset
         *      CONFIG_ATARI
         *              a0 = address of SCC
         *              a1 = Liobase address/address of scc_initable
         *              d0 = init data for serial port
         *      CONFIG_MAC
         *              a0 = address of SCC
         *              a1 = address of scc_initable_mac
         *              d0 = init data for serial port
         */
 
#ifdef CONFIG_AMIGA
#define SERIAL_DTR      7
#define SERIAL_CNTRL    CIABBASE+C_PRA
 
        is_not_amiga(1f)
        lea     %pc@(L(custom)),%a0
        movel   #-ZTWOBASE,%a0@
        bclr    #SERIAL_DTR,SERIAL_CNTRL-ZTWOBASE
        get_bi_record   BI_AMIGA_SERPER
        movew   %a0@,CUSTOMBASE+C_SERPER-ZTWOBASE
|       movew   #61,CUSTOMBASE+C_SERPER-ZTWOBASE
1:
#endif
#ifdef CONFIG_ATARI
        is_not_atari(4f)
        movel   %pc@(L(iobase)),%a1
#if defined(USE_PRINTER)
        bclr    #0,%a1@(LSTMFP_IERB)
        bclr    #0,%a1@(LSTMFP_DDR)
        moveb   #LPSG_CONTROL,%a1@(LPSG_SELECT)
        moveb   #0xff,%a1@(LPSG_WRITE)
        moveb   #LPSG_IO_B,%a1@(LPSG_SELECT)
        clrb    %a1@(LPSG_WRITE)
        moveb   #LPSG_IO_A,%a1@(LPSG_SELECT)
        moveb   %a1@(LPSG_READ),%d0
        bset    #5,%d0
        moveb   %d0,%a1@(LPSG_WRITE)
#elif defined(USE_SCC)
        lea     %a1@(LSCC_CTRL),%a0
        lea     %pc@(L(scc_initable)),%a1
2:      moveb   %a1@+,%d0
        jmi     3f
        moveb   %d0,%a0@
        moveb   %a1@+,%a0@
        jra     2b
3:      clrb    %a0@
#elif defined(USE_MFP)
        bclr    #1,%a1@(LMFP_TSR)
        moveb   #0x88,%a1@(LMFP_UCR)
        andb    #0x70,%a1@(LMFP_TDCDR)
        moveb   #2,%a1@(LMFP_TDDR)
        orb     #1,%a1@(LMFP_TDCDR)
        bset    #1,%a1@(LMFP_TSR)
#endif
        jra     L(serial_init_done)
4:
#endif
#ifdef CONFIG_MAC
        is_not_mac(L(serial_init_not_mac))
#ifdef MAC_SERIAL_DEBUG
#if !defined(MAC_USE_SCC_A) && !defined(MAC_USE_SCC_B)
#define MAC_USE_SCC_B
#endif
#define mac_scc_cha_b_ctrl_offset       0x0
#define mac_scc_cha_a_ctrl_offset       0x2
#define mac_scc_cha_b_data_offset       0x4
#define mac_scc_cha_a_data_offset       0x6
 
#ifdef MAC_USE_SCC_A
        /* Initialize channel A */
        movel   %pc@(L(mac_sccbase)),%a0
        lea     %pc@(L(scc_initable_mac)),%a1
5:      moveb   %a1@+,%d0
        jmi     6f
        moveb   %d0,%a0@(mac_scc_cha_a_ctrl_offset)
        moveb   %a1@+,%a0@(mac_scc_cha_a_ctrl_offset)
        jra     5b
6:
#endif  /* MAC_USE_SCC_A */
 
#ifdef MAC_USE_SCC_B
        /* Initialize channel B */
#ifndef MAC_USE_SCC_A   /* Load mac_sccbase only if needed */
        movel   %pc@(L(mac_sccbase)),%a0
#endif  /* MAC_USE_SCC_A */
        lea     %pc@(L(scc_initable_mac)),%a1
7:      moveb   %a1@+,%d0
        jmi     8f
        moveb   %d0,%a0@(mac_scc_cha_b_ctrl_offset)
        moveb   %a1@+,%a0@(mac_scc_cha_b_ctrl_offset)
        jra     7b
8:
#endif  /* MAC_USE_SCC_B */
#endif  /* MAC_SERIAL_DEBUG */
 
        jra     L(serial_init_done)
L(serial_init_not_mac):
#endif  /* CONFIG_MAC */
 
#ifdef CONFIG_Q40
        is_not_q40(2f)
/* debug output goes into SRAM, so we don't do it unless requested
   - check for '%LX$' signature in SRAM   */
        lea     %pc@(SYMBOL_NAME(q40_mem_cptr)),%a1
        move.l  #0xff020010,%a1@  /* must be inited - also used by debug=mem */
        move.l  #0xff020000,%a1
        cmp.b   #'%',%a1@
        bne     2f      /*nodbg*/
        addq.w  #4,%a1
        cmp.b   #'L',%a1@
        bne     2f      /*nodbg*/
        addq.w  #4,%a1
        cmp.b   #'X',%a1@
        bne     2f      /*nodbg*/
        addq.w  #4,%a1
        cmp.b   #'$',%a1@
        bne     2f      /*nodbg*/
        /* signature OK */
        lea     %pc@(L(q40_do_debug)),%a1
        tas     %a1@
/*nodbg: q40_do_debug is 0 by default*/
2:
#endif
 
#ifdef CONFIG_APOLLO
/* We count on the PROM initializing SIO1 */
#endif
 
L(serial_init_done):
func_return     serial_init
 
/*
 * Output character on serial port.
 */
func_start      serial_putc,%d0/%d1/%a0/%a1
 
        movel   ARG1,%d0
        cmpib   #'\n',%d0
        jbne    1f
 
        /* A little safe recursion is good for the soul */
        serial_putc     #'\r'
1:
 
#ifdef CONFIG_AMIGA
        is_not_amiga(2f)
        andw    #0x00ff,%d0
        oriw    #0x0100,%d0
        movel   %pc@(L(custom)),%a0
        movew   %d0,%a0@(CUSTOMBASE+C_SERDAT)
1:      movew   %a0@(CUSTOMBASE+C_SERDATR),%d0
        andw    #0x2000,%d0
        jeq     1b
        jra     L(serial_putc_done)
2:
#endif
 
#ifdef CONFIG_MAC
        is_not_mac(5f)
 
#ifdef MAC_SERIAL_DEBUG
 
#ifdef MAC_USE_SCC_A
        movel   %pc@(L(mac_sccbase)),%a1
3:      btst    #2,%a1@(mac_scc_cha_a_ctrl_offset)
        jeq     3b
        moveb   %d0,%a1@(mac_scc_cha_a_data_offset)
#endif  /* MAC_USE_SCC_A */
 
#ifdef MAC_USE_SCC_B
#ifndef MAC_USE_SCC_A   /* Load mac_sccbase only if needed */
        movel   %pc@(L(mac_sccbase)),%a1
#endif  /* MAC_USE_SCC_A */
4:      btst    #2,%a1@(mac_scc_cha_b_ctrl_offset)
        jeq     4b
        moveb   %d0,%a1@(mac_scc_cha_b_data_offset)
#endif  /* MAC_USE_SCC_B */
 
#endif  /* MAC_SERIAL_DEBUG */
 
        jra     L(serial_putc_done)
5:
#endif  /* CONFIG_MAC */
 
#ifdef CONFIG_ATARI
        is_not_atari(4f)
        movel   %pc@(L(iobase)),%a1
#if defined(USE_PRINTER)
3:      btst    #0,%a1@(LSTMFP_GPIP)
        jne     3b
        moveb   #LPSG_IO_B,%a1@(LPSG_SELECT)
        moveb   %d0,%a1@(LPSG_WRITE)
        moveb   #LPSG_IO_A,%a1@(LPSG_SELECT)
        moveb   %a1@(LPSG_READ),%d0
        bclr    #5,%d0
        moveb   %d0,%a1@(LPSG_WRITE)
        nop
        nop
        bset    #5,%d0
        moveb   %d0,%a1@(LPSG_WRITE)
#elif defined(USE_SCC)
3:      btst    #2,%a1@(LSCC_CTRL)
        jeq     3b
        moveb   %d0,%a1@(LSCC_DATA)
#elif defined(USE_MFP)
3:      btst    #7,%a1@(LMFP_TSR)
        jeq     3b
        moveb   %d0,%a1@(LMFP_UDR)
#endif
        jra     L(serial_putc_done)
4:
#endif  /* CONFIG_ATARI */
 
#ifdef CONFIG_MVME147
        is_not_mvme147(2f)
1:      btst    #2,M147_SCC_CTRL_A
        jeq     1b
        moveb   %d0,M147_SCC_DATA_A
        jbra    L(serial_putc_done)
2:
#endif
 
#ifdef CONFIG_MVME16x
        is_not_mvme16x(2f)
        /*
         * If the loader gave us a board type then we can use that to
         * select an appropriate output routine; otherwise we just use
         * the Bug code.  If we haev to use the Bug that means the Bug
         * workspace has to be valid, which means the Bug has to use
         * the SRAM, which is non-standard.
         */
        moveml  %d0-%d7/%a2-%a6,%sp@-
        movel   SYMBOL_NAME(vme_brdtype),%d1
        jeq     1f                      | No tag - use the Bug
        cmpi    #VME_TYPE_MVME162,%d1
        jeq     6f
        cmpi    #VME_TYPE_MVME172,%d1
        jne     5f
        /* 162/172; it's an SCC */
6:      btst    #2,M162_SCC_CTRL_A
        nop
        nop
        nop
        jeq     6b
        moveb   #8,M162_SCC_CTRL_A
        nop
        nop
        nop
        moveb   %d0,M162_SCC_CTRL_A
        jra     3f
5:
        /* 166/167/177; its a CD2401 */
        moveb   #0,M167_CYCAR
        moveb   M167_CYIER,%d2
        moveb   #0x02,M167_CYIER
7:
        btst    #5,M167_PCSCCTICR
        jeq     7b
        moveb   M167_PCTPIACKR,%d1
        moveb   M167_CYLICR,%d1
        jeq     8f
        moveb   #0x08,M167_CYTEOIR
        jra     7b
8:
        moveb   %d0,M167_CYTDR
        moveb   #0,M167_CYTEOIR
        moveb   %d2,M167_CYIER
        jra     3f
1:
        moveb   %d0,%sp@-
        trap    #15
        .word   0x0020  /* TRAP 0x020 */
3:
        moveml  %sp@+,%d0-%d7/%a2-%a6
        jbra    L(serial_putc_done)
2:
#endif CONFIG_MVME16x
 
#ifdef CONFIG_BVME6000
        is_not_bvme6000(2f)
        /*
         * The BVME6000 machine has a serial port ...
         */
1:      btst    #2,BVME_SCC_CTRL_A
        jeq     1b
        moveb   %d0,BVME_SCC_DATA_A
        jbra    L(serial_putc_done)
2:
#endif
 
#ifdef CONFIG_SUN3X
        is_not_sun3x(2f)
        movel   %d0,-(%sp)
        movel   0xFEFE0018,%a1
        jbsr    (%a1)
        addq    #4,%sp
        jbra    L(serial_putc_done)
2:
#endif
 
#ifdef CONFIG_Q40
        is_not_q40(2f)
        tst.l   %pc@(L(q40_do_debug))   /* only debug if requested */
        beq     2f
        lea     %pc@(SYMBOL_NAME(q40_mem_cptr)),%a1
        move.l  %a1@,%a0
        move.b  %d0,%a0@
        addq.l  #4,%a0
        move.l  %a0,%a1@
        jbra    L(serial_putc_done)
2:
#endif
 
#ifdef CONFIG_APOLLO
        is_not_apollo(2f)
        movl    %pc@(L(iobase)),%a1
        moveb   %d0,%a1@(LTHRB0)
1:      moveb   %a1@(LSRB0),%d0
        andb    #0x4,%d0
        beq     1b
2:
#endif
 
L(serial_putc_done):
func_return     serial_putc
 
/*
 * Output a string.
 */
func_start      puts,%d0/%a0
 
        movel   ARG1,%a0
        jra     2f
1:
#ifdef CONSOLE
        console_putc    %d0
#endif
#ifdef SERIAL_DEBUG
        serial_putc     %d0
#endif
2:      moveb   %a0@+,%d0
        jne     1b
 
func_return     puts
 
/*
 * Output number in hex notation.
 */
 
func_start      putn,%d0-%d2
 
        putc    ' '
 
        movel   ARG1,%d0
        moveq   #7,%d1
1:      roll    #4,%d0
        move    %d0,%d2
        andb    #0x0f,%d2
        addb    #'0',%d2
        cmpb    #'9',%d2
        jls     2f
        addb    #'A'-('9'+1),%d2
2:
#ifdef CONSOLE
        console_putc    %d2
#endif
#ifdef SERIAL_DEBUG
        serial_putc     %d2
#endif
        dbra    %d1,1b
 
func_return     putn
 
#ifdef CONFIG_MAC
/*
 *      mac_serial_print
 *
 *      This routine takes its parameters on the stack.  It then
 *      turns around and calls the internal routine.  This routine
 *      is used until the Linux console driver initializes itself.
 *
 *      The calling parameters are:
 *              void mac_serial_print(const char *str);
 *
 *      This routine does NOT understand variable arguments only
 *      simple strings!
 */
ENTRY(mac_serial_print)
        moveml  %d0/%a0,%sp@-
#if 1
        move    %sr,%sp@-
        ori     #0x0700,%sr
#endif
        movel   %sp@(10),%a0            /* fetch parameter */
        jra     2f
1:      serial_putc     %d0
2:      moveb   %a0@+,%d0
        jne     1b
#if 1
        move    %sp@+,%sr
#endif
        moveml  %sp@+,%d0/%a0
        rts
#endif /* CONFIG_MAC */
 
#if defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
func_start      set_leds,%d0/%a0
        movel   ARG1,%d0
#ifdef CONFIG_HP300
        is_not_hp300(1f)
        movel   %pc@(L(custom)),%a0
        moveb   %d0,%a0@(0x1ffff)
        jra     2f
#endif
1:
#ifdef CONFIG_APOLLO
        movel   %pc@(L(iobase)),%a0
        lsll    #8,%d0
        eorw    #0xff00,%d0
        moveb   %d0,%a0@(LCPUCTRL)
#endif
2:
func_return     set_leds
#endif
 
#ifdef CONSOLE
/*
 *      For continuity, see the data alignment
 *      to which this structure is tied.
 */
#define Lconsole_struct_cur_column      0
#define Lconsole_struct_cur_row         4
#define Lconsole_struct_num_columns     8
#define Lconsole_struct_num_rows        12
#define Lconsole_struct_left_edge       16
#define Lconsole_struct_penguin_putc    20
 
L(console_init):
        /*
         *      Some of the register usage that follows
         *              a0 = pointer to boot_info
         *              a1 = pointer to screen
         *              a2 = pointer to Lconsole_globals
         *              d3 = pixel width of screen
         *              d4 = pixel height of screen
         *              (d3,d4) ~= (x,y) of a point just below
         *                      and to the right of the screen
         *                      NOT on the screen!
         *              d5 = number of bytes per scan line
         *              d6 = number of bytes on the entire screen
         */
        moveml  %a0-%a4/%d0-%d7,%sp@-
 
        lea     %pc@(L(console_globals)),%a2
        lea     %pc@(L(mac_videobase)),%a0
        movel   %a0@,%a1
        lea     %pc@(L(mac_rowbytes)),%a0
        movel   %a0@,%d5
        lea     %pc@(L(mac_dimensions)),%a0
        movel   %a0@,%d3        /* -> low byte */
        movel   %d3,%d4
        swap    %d4             /* -> high byte */
        andl    #0xffff,%d3     /* d3 = screen width in pixels */
        andl    #0xffff,%d4     /* d4 = screen height in pixels */
 
        movel   %d5,%d6
        subl    #20,%d6
        mulul   %d4,%d6         /* scan line bytes x num scan lines */
        divul   #8,%d6          /* we'll clear 8 bytes at a time */
        subq    #1,%d6
 
console_clear_loop:
        movel   #0xffffffff,%a1@+       /* Mac_black */
        movel   #0xffffffff,%a1@+       /* Mac_black */
        dbra    %d6,console_clear_loop
 
        /* Calculate font size */
 
#if   defined(FONT_8x8) && defined(CONFIG_FONT_8x8)
        lea     %pc@(SYMBOL_NAME(font_vga_8x8)), %a0
#elif defined(FONT_8x16) && defined(CONFIG_FONT_8x16)
        lea     %pc@(SYMBOL_NAME(font_vga_8x16)),%a0
#elif defined(FONT_6x11) && defined(CONFIG_FONT_6x11)
        lea     %pc@(SYMBOL_NAME(font_vga_6x11)),%a0
#elif defined(CONFIG_FONT_8x8) /* default *
        lea     %pc@(SYMBOL_NAME(font_vga_8x8)), %a0
#else /* no compiled-in font */
        lea     0,%a0
#endif
 
        /*
         *      At this point we make a shift in register usage
         *      a1 = address of Lconsole_font pointer
         */
        lea     %pc@(L(console_font)),%a1
        movel   %a0,%a1@        /* store pointer to struct fbcon_font_desc in Lconsole_font */
        tstl    %a0
        jeq     1f
 
        /*
         *      Calculate global maxs
         *      Note - we can use either an
         *      8 x 16 or 8 x 8 character font
         *      6 x 11 also supported
         */
                /* ASSERT: a0 = contents of Lconsole_font */
        movel   %d3,%d0                 /* screen width in pixels */
        divul   %a0@(FBCON_FONT_DESC_WIDTH),%d0         /* d0 = max num chars per row */
 
        movel   %d4,%d1                  /* screen height in pixels */
        divul   %a0@(FBCON_FONT_DESC_HEIGHT),%d1         /* d1 = max num rows */
 
        movel   %d0,%a2@(Lconsole_struct_num_columns)
        movel   %d1,%a2@(Lconsole_struct_num_rows)
 
        /*
         *      Clear the current row and column
         */
        clrl    %a2@(Lconsole_struct_cur_column)
        clrl    %a2@(Lconsole_struct_cur_row)
        clrl    %a2@(Lconsole_struct_left_edge)
 
        /*
         * Initialization is complete
         */
1:      moveml  %sp@+,%a0-%a4/%d0-%d7
        rts
 
L(console_put_stats):
        /*
         *      Some of the register usage that follows
         *              a0 = pointer to boot_info
         *              d7 = value of boot_info fields
         */
        moveml  %a0/%d7,%sp@-
 
        puts    "\nMacLinux\n\n"
 
#ifdef SERIAL_DEBUG
        puts    " vidaddr:"
        putn    %pc@(L(mac_videobase))          /* video addr. */
 
        puts    "\n  _stext:"
        lea     %pc@(SYMBOL_NAME(_stext)),%a0
        putn    %a0
 
        puts    "\nbootinfo:"
        lea     %pc@(SYMBOL_NAME(_end)),%a0
        putn    %a0
 
        puts    "\ncpuid:"
        putn    %pc@(L(cputype))
        putc    '\n'
 
#ifdef MAC_SERIAL_DEBUG
        putn    %pc@(L(mac_sccbase))
        putc    '\n'
#endif
#  if defined(MMU_PRINT)
        jbsr    mmu_print_machine_cpu_types
#  endif /* MMU_PRINT */
#endif /* SERIAL_DEBUG */
 
        moveml  %sp@+,%a0/%d7
        rts
 
#ifdef CONSOLE_PENGUIN
L(console_put_penguin):
        /*
         *      Get 'that_penguin' onto the screen in the upper right corner
         *      penguin is 64 x 74 pixels, align against right edge of screen
         */
        moveml  %a0-%a1/%d0-%d7,%sp@-
 
        lea     %pc@(L(mac_dimensions)),%a0
        movel   %a0@,%d0
        andil   #0xffff,%d0
        subil   #64,%d0         /* snug up against the right edge */
        clrl    %d1             /* start at the top */
        movel   #73,%d7
        lea     %pc@(SYMBOL_NAME(that_penguin)),%a1
console_penguin_row:
        movel   #31,%d6
console_penguin_pixel_pair:
        moveb   %a1@,%d2
        lsrb    #4,%d2
        jbsr    console_plot_pixel
        addq    #1,%d0
        moveb   %a1@+,%d2
        jbsr    console_plot_pixel
        addq    #1,%d0
        dbra    %d6,console_penguin_pixel_pair
 
        subil   #64,%d0
        addq    #1,%d1
        dbra    %d7,console_penguin_row
 
        moveml  %sp@+,%a0-%a1/%d0-%d7
        rts
#endif
 
console_scroll:
        moveml  %a0-%a4/%d0-%d7,%sp@-
 
        /*
         * Calculate source and destination addresses
         *      output  a1 = dest
         *              a2 = source
         */
        lea     %pc@(L(mac_videobase)),%a0
        movel   %a0@,%a1
        movel   %a1,%a2
        lea     %pc@(L(mac_rowbytes)),%a0
        movel   %a0@,%d5
        movel   %pc@(L(console_font)),%a0
        tstl    %a0
        jeq     1f
        mulul   %a0@(FBCON_FONT_DESC_HEIGHT),%d5        /* account for # scan lines per character */
        addal   %d5,%a2
 
        /*
         * Get dimensions
         */
        lea     %pc@(L(mac_dimensions)),%a0
        movel   %a0@,%d3
        movel   %d3,%d4
        swap    %d4
        andl    #0xffff,%d3     /* d3 = screen width in pixels */
        andl    #0xffff,%d4     /* d4 = screen height in pixels */
 
        /*
         * Calculate number of bytes to move
         */
        lea     %pc@(L(mac_rowbytes)),%a0
        movel   %a0@,%d6
        movel   %pc@(L(console_font)),%a0
        subl    %a0@(FBCON_FONT_DESC_HEIGHT),%d4        /* we're not scrolling the top row! */
        mulul   %d4,%d6         /* scan line bytes x num scan lines */
        divul   #32,%d6         /* we'll move 8 longs at a time */
        subq    #1,%d6
 
console_scroll_loop:
        movel   %a2@+,%a1@+
        movel   %a2@+,%a1@+
        movel   %a2@+,%a1@+
        movel   %a2@+,%a1@+
        movel   %a2@+,%a1@+
        movel   %a2@+,%a1@+
        movel   %a2@+,%a1@+
        movel   %a2@+,%a1@+
        dbra    %d6,console_scroll_loop
 
        lea     %pc@(L(mac_rowbytes)),%a0
        movel   %a0@,%d6
        movel   %pc@(L(console_font)),%a0
        mulul   %a0@(FBCON_FONT_DESC_HEIGHT),%d6        /* scan line bytes x font height */
        divul   #32,%d6                 /* we'll move 8 words at a time */
        subq    #1,%d6
 
        moveq   #-1,%d0
console_scroll_clear_loop:
        movel   %d0,%a1@+
        movel   %d0,%a1@+
        movel   %d0,%a1@+
        movel   %d0,%a1@+
        movel   %d0,%a1@+
        movel   %d0,%a1@+
        movel   %d0,%a1@+
        movel   %d0,%a1@+
        dbra    %d6,console_scroll_clear_loop
 
1:      moveml  %sp@+,%a0-%a4/%d0-%d7
        rts
 
 
func_start      console_putc,%a0/%a1/%d0-%d7
 
        is_not_mac(console_exit)
        tstl    %pc@(L(console_font))
        jeq     console_exit
 
        /* Output character in d7 on console.
         */
        movel   ARG1,%d7
        cmpib   #'\n',%d7
        jbne    1f
 
        /* A little safe recursion is good for the soul */
        console_putc    #'\r'
1:
        lea     %pc@(L(console_globals)),%a0
 
        cmpib   #10,%d7
        jne     console_not_lf
        movel   %a0@(Lconsole_struct_cur_row),%d0
        addil   #1,%d0
        movel   %d0,%a0@(Lconsole_struct_cur_row)
        movel   %a0@(Lconsole_struct_num_rows),%d1
        cmpl    %d1,%d0
        jcs     1f
        subil   #1,%d0
        movel   %d0,%a0@(Lconsole_struct_cur_row)
        jbsr    console_scroll
1:
        jra     console_exit
 
console_not_lf:
        cmpib   #13,%d7
        jne     console_not_cr
        clrl    %a0@(Lconsole_struct_cur_column)
        jra     console_exit
 
console_not_cr:
        cmpib   #1,%d7
        jne     console_not_home
        clrl    %a0@(Lconsole_struct_cur_row)
        clrl    %a0@(Lconsole_struct_cur_column)
        jra     console_exit
 
/*
 *      At this point we know that the %d7 character is going to be
 *      rendered on the screen.  Register usage is -
 *              a0 = pointer to console globals
 *              a1 = font data
 *              d0 = cursor column
 *              d1 = cursor row to draw the character
 *              d7 = character number
 */
console_not_home:
        movel   %a0@(Lconsole_struct_cur_column),%d0
        addil   #1,%a0@(Lconsole_struct_cur_column)
        movel   %a0@(Lconsole_struct_num_columns),%d1
        cmpl    %d1,%d0
        jcs     1f
        console_putc    #'\n'   /* recursion is OK! */
1:
        movel   %a0@(Lconsole_struct_cur_row),%d1
 
        /*
         *      At this point we make a shift in register usage
         *      a0 = address of pointer to font data (fbcon_font_desc)
         */
        movel   %pc@(L(console_font)),%a0
        movel   %a0@(FBCON_FONT_DESC_DATA),%a1  /* Load fbcon_font_desc.data into a1 */
        andl    #0x000000ff,%d7
                /* ASSERT: a0 = contents of Lconsole_font */
        mulul   %a0@(FBCON_FONT_DESC_HEIGHT),%d7        /* d7 = index into font data */
        addl    %d7,%a1                 /* a1 = points to char image */
 
        /*
         *      At this point we make a shift in register usage
         *      d0 = pixel coordinate, x
         *      d1 = pixel coordinate, y
         *      d2 = (bit 0) 1/0 for white/black (!) pixel on screen
         *      d3 = font scan line data (8 pixels)
         *      d6 = count down for the font's pixel width (8)
         *      d7 = count down for the font's pixel count in height
         */
                /* ASSERT: a0 = contents of Lconsole_font */
        mulul   %a0@(FBCON_FONT_DESC_WIDTH),%d0
        mulul   %a0@(FBCON_FONT_DESC_HEIGHT),%d1
        movel   %a0@(FBCON_FONT_DESC_HEIGHT),%d7        /* Load fbcon_font_desc.height into d7 */
        subq    #1,%d7
console_read_char_scanline:
        moveb   %a1@+,%d3
 
                /* ASSERT: a0 = contents of Lconsole_font */
        movel   %a0@(FBCON_FONT_DESC_WIDTH),%d6 /* Load fbcon_font_desc.width into d6 */
        subql   #1,%d6
 
console_do_font_scanline:
        lslb    #1,%d3
        scsb    %d2             /* convert 1 bit into a byte */
        jbsr    console_plot_pixel
        addq    #1,%d0
        dbra    %d6,console_do_font_scanline
 
                /* ASSERT: a0 = contents of Lconsole_font */
        subl    %a0@(FBCON_FONT_DESC_WIDTH),%d0
        addq    #1,%d1
        dbra    %d7,console_read_char_scanline
 
console_exit:
 
func_return     console_putc
 
console_plot_pixel:
        /*
         *      Input:
         *              d0 = x coordinate
         *              d1 = y coordinate
         *              d2 = (bit 0) 1/0 for white/black (!)
         *      All registers are preserved
         */
        moveml  %a0-%a1/%d0-%d4,%sp@-
 
        lea     %pc@(L(mac_videobase)),%a0
        movel   %a0@,%a1
        lea     %pc@(L(mac_videodepth)),%a0
        movel   %a0@,%d3
        lea     %pc@(L(mac_rowbytes)),%a0
        mulul   %a0@,%d1
 
        /*
         *      Register usage:
         *              d0 = x coord becomes byte offset into frame buffer
         *              d1 = y coord
         *              d2 = black or white (0/1)
         *              d3 = video depth
         *              d4 = temp of x (d0) for many bit depths
         *              d5 = unused
         *              d6 = unused
         *              d7 = unused
         */
test_1bit:
        cmpb    #1,%d3
        jbne    test_2bit
        movel   %d0,%d4         /* we need the low order 3 bits! */
        divul   #8,%d0
        addal   %d0,%a1
        addal   %d1,%a1
        andb    #7,%d4
        eorb    #7,%d4          /* reverse the x-coordinate w/ screen-bit # */
        andb    #1,%d2
        jbne    white_1
        bsetb   %d4,%a1@
        jbra    console_plot_pixel_exit
white_1:
        bclrb   %d4,%a1@
        jbra    console_plot_pixel_exit
 
test_2bit:
        cmpb    #2,%d3
        jbne    test_4bit
        movel   %d0,%d4         /* we need the low order 2 bits! */
        divul   #4,%d0
        addal   %d0,%a1
        addal   %d1,%a1
        andb    #3,%d4
        eorb    #3,%d4          /* reverse the x-coordinate w/ screen-bit # */
        lsll    #1,%d4          /* ! */
        andb    #1,%d2
        jbne    white_2
        bsetb   %d4,%a1@
        addq    #1,%d4
        bsetb   %d4,%a1@
        jbra    console_plot_pixel_exit
white_2:
        bclrb   %d4,%a1@
        addq    #1,%d4
        bclrb   %d4,%a1@
        jbra    console_plot_pixel_exit
 
test_4bit:
        cmpb    #4,%d3
        jbne    test_8bit
        movel   %d0,%d4         /* we need the low order bit! */
        divul   #2,%d0
        addal   %d0,%a1
        addal   %d1,%a1
        andb    #1,%d4
        eorb    #1,%d4
        lsll    #2,%d4          /* ! */
        andb    #1,%d2
        jbne    white_4
        bsetb   %d4,%a1@
        addq    #1,%d4
        bsetb   %d4,%a1@
        addq    #1,%d4
        bsetb   %d4,%a1@
        addq    #1,%d4
        bsetb   %d4,%a1@
        jbra    console_plot_pixel_exit
white_4:
        bclrb   %d4,%a1@
        addq    #1,%d4
        bclrb   %d4,%a1@
        addq    #1,%d4
        bclrb   %d4,%a1@
        addq    #1,%d4
        bclrb   %d4,%a1@
        jbra    console_plot_pixel_exit
 
test_8bit:
        cmpb    #8,%d3
        jbne    test_16bit
        addal   %d0,%a1
        addal   %d1,%a1
        andb    #1,%d2
        jbne    white_8
        moveb   #0xff,%a1@
        jbra    console_plot_pixel_exit
white_8:
        clrb    %a1@
        jbra    console_plot_pixel_exit
 
test_16bit:
        cmpb    #16,%d3
        jbne    console_plot_pixel_exit
        addal   %d0,%a1
        addal   %d0,%a1
        addal   %d1,%a1
        andb    #1,%d2
        jbne    white_16
        clrw    %a1@
        jbra    console_plot_pixel_exit
white_16:
        movew   #0x0fff,%a1@
        jbra    console_plot_pixel_exit
 
console_plot_pixel_exit:
        moveml  %sp@+,%a0-%a1/%d0-%d4
        rts
#endif /* CONSOLE */
 
#if 0
/*
 * This is some old code lying around.  I don't believe
 * it's used or important anymore.  My guess is it contributed
 * to getting to this point, but it's done for now.
 * It was still in the 2.1.77 head.S, so it's still here.
 * (And still not used!)
 */
L(showtest):
        moveml  %a0/%d7,%sp@-
        puts    "A="
        putn    %a1
 
        .long   0xf0119f15              | ptestr        #5,%a1@,#7,%a0
 
        puts    "DA="
        putn    %a0
 
        puts    "D="
        putn    %a0@
 
        puts    "S="
        lea     %pc@(L(mmu)),%a0
        .long   0xf0106200              | pmove         %psr,%a0@
        clrl    %d7
        movew   %a0@,%d7
        putn    %d7
 
        putc    '\n'
        moveml  %sp@+,%a0/%d7
        rts
#endif  /* 0 */
 
__INITDATA
        .align  4
 
#ifdef CONFIG_HP300
SYMBOL_NAME_LABEL(hp300_phys_ram_base)
#endif
 
#if defined(CONFIG_ATARI) || defined(CONFIG_AMIGA) || \
    defined(CONFIG_HP300) || defined(CONFIG_APOLLO)
L(custom):
L(iobase):
        .long 0
#endif
 
#ifdef CONFIG_MAC
L(console_video_virtual):
        .long   0
#endif  /* CONFIG_MAC */
 
#if defined(CONSOLE)
L(console_globals):
        .long   0                /* cursor column */
        .long   0                /* cursor row */
        .long   0                /* max num columns */
        .long   0                /* max num rows */
        .long   0                /* left edge */
        .long   0                /* mac putc */
L(console_font):
        .long   0                /* pointer to console font (struct fbcon_font_desc) */
#endif /* CONSOLE */
 
#if defined(MMU_PRINT)
L(mmu_print_data):
        .long   0                /* valid flag */
        .long   0                /* start logical */
        .long   0                /* next logical */
        .long   0                /* start physical */
        .long   0                /* next physical */
#endif /* MMU_PRINT */
 
L(cputype):
        .long   0
L(mmu_cached_pointer_tables):
        .long   0
L(mmu_num_pointer_tables):
        .long   0
L(phys_kernel_start):
        .long   0
L(kernel_end):
        .long   0
L(memory_start):
        .long   0
L(kernel_pgdir_ptr):
        .long   0
L(temp_mmap_mem):
        .long   0
 
#if defined (CONFIG_MVME147)
M147_SCC_CTRL_A = 0xfffe3002
M147_SCC_DATA_A = 0xfffe3003
#endif
 
#if defined (CONFIG_MVME16x)
M162_SCC_CTRL_A = 0xfff45005
M167_CYCAR = 0xfff450ee
M167_CYIER = 0xfff45011
M167_CYLICR = 0xfff45026
M167_CYTEOIR = 0xfff45085
M167_CYTDR = 0xfff450f8
M167_PCSCCTICR = 0xfff4201e
M167_PCTPIACKR = 0xfff42025
#endif
 
#if defined (CONFIG_BVME6000)
BVME_SCC_CTRL_A = 0xffb0000b
BVME_SCC_DATA_A = 0xffb0000f
#endif
 
#if defined(CONFIG_MAC)
L(mac_booter_data):
        .long   0
L(mac_videobase):
        .long   0
L(mac_videodepth):
        .long   0
L(mac_dimensions):
        .long   0
L(mac_rowbytes):
        .long   0
#ifdef MAC_SERIAL_DEBUG
L(mac_sccbase):
        .long   0
#endif /* MAC_SERIAL_DEBUG */
#endif
 
#if defined (CONFIG_APOLLO)
LSRB0        = 0x10412
LTHRB0       = 0x10416
LCPUCTRL     = 0x10100
#endif
 
__FINIT
        .data
        .align  4
 
SYMBOL_NAME_LABEL(availmem)
        .long   0
SYMBOL_NAME_LABEL(m68k_pgtable_cachemode)
        .long   0
SYMBOL_NAME_LABEL(m68k_supervisor_cachemode)
        .long   0
#if defined(CONFIG_MVME16x)
SYMBOL_NAME_LABEL(mvme_bdid)
        .long   0,0,0,0,0,0,0,0
#endif
#if defined(CONFIG_Q40)
SYMBOL_NAME_LABEL(q40_mem_cptr)
        .long 0
L(q40_do_debug):
        .long 0
#endif
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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [arch/] [m68k/] [kernel/] [head.S] - Blame information for rev 1765

Line No.	Rev	Author	Line
1	1275	phoenix	`/* -- mode: asm --`
2			`**`
3			`** head.S -- This file contains the initial boot code for the`
4			`** Linux/68k kernel.`
5			`**`
6			`** Copyright 1993 by Hamish Macdonald`
7			`**`
8			`** 68040 fixes by Michael Rausch`
9			`** 68060 fixes by Roman Hodek`
10			`** MMU cleanup by Randy Thelen`
11			`** Final MMU cleanup by Roman Zippel`
12			`**`
13			`** Atari support by Andreas Schwab, using ideas of Robert de Vries`
14			`** and Bjoern Brauel`
15			`** VME Support by Richard Hirst`
16			`**`
17			`** 94/11/14 Andreas Schwab: put kernel at PAGESIZE`
18			`** 94/11/18 Andreas Schwab: remove identity mapping of STRAM for Atari`
19			`** ++ Bjoern & Roman: ATARI-68040 support for the Medusa`
20			`** 95/11/18 Richard Hirst: Added MVME166 support`
21			`** 96/04/26 Guenther Kelleter: fixed identity mapping for Falcon with`
22			`** Magnum- and FX-alternate ram`
23			`** 98/04/25 Phil Blundell: added HP300 support`
24			`** 1998/08/30 David Kilzer: Added support for fbcon_font_desc structures`
25			`** for linux-2.1.115`
26			`** 9/02/11 Richard Zidlicky: added Q40 support (initial vesion 99/01/01)`
27			`**`
28			`** This file is subject to the terms and conditions of the GNU General Public`
29			`** License. See the file README.legal in the main directory of this archive`
30			`** for more details.`
31			`**`
32			`*/`
33
34			`/*`
35			`* Linux startup code.`
36			`*`
37			`* At this point, the boot loader has:`
38			`* Disabled interrupts`
39			`* Disabled caches`
40			`* Put us in supervisor state.`