Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

#include <linux/linkage.h>

#include <asm/entry.h>
#include <asm/page.h>
#include <asm/contregs.h>
#include <asm/sun3-head.h>

PSL_HIGHIPL     = 0x2700
NBSG            = 0x20000
ICACHE_ONLY     = 0x00000009
CACHES_OFF      = 0x00000008    | actually a clear and disable --m
#define MAS_STACK INT_STACK
ROOT_TABLE_SIZE = 128
PAGESIZE        = 8192
SUN3_INVALID_PMEG = 255
.globl bootup_user_stack
.globl bootup_kernel_stack
.globl pg0
.globl swapper_pg_dir
.globl kernel_pmd_table
.globl availmem
.global m68k_pgtable_cachemode
.global kpt
| todo: all these should be in bss!
swapper_pg_dir:                .skip 0x2000
pg0:                           .skip 0x2000
kernel_pmd_table:              .skip 0x2000

.globl kernel_pg_dir
.equ    kernel_pg_dir,kernel_pmd_table

        .section .text.head
ENTRY(_stext)
ENTRY(_start)

/* Firstly, disable interrupts and set up function codes. */
        movew   #PSL_HIGHIPL, %sr
        moveq   #FC_CONTROL, %d0
        movec   %d0, %sfc
        movec   %d0, %dfc

/* Make sure we're in context zero. */
        moveq   #0, %d0
        movsb   %d0, AC_CONTEXT

/* map everything the bootloader left us into high memory, clean up the
   excess later */
        lea     (AC_SEGMAP+0),%a0
        lea     (AC_SEGMAP+KERNBASE),%a1
1:
        movsb   %a0@, %d1
        movsb   %d1, %a1@
        cmpib   #SUN3_INVALID_PMEG, %d1
        beq     2f
        addl    #NBSG,%a0
        addl    #NBSG,%a1
        jmp     1b

2:

/* Disable caches and jump to high code. */
        moveq   #ICACHE_ONLY,%d0        | Cache disabled until we're ready to enable it
        movc    %d0, %cacr      |   is this the right value? (yes --m)
        jmp     1f:l

/* Following code executes at high addresses (0xE000xxx). */
1:      lea     init_task,%curptr                       | get initial thread...
        lea     init_thread_union+THREAD_SIZE,%sp       | ...and its stack.

/* Point MSP at an invalid page to trap if it's used. --m */
        movl    #(PAGESIZE),%d0
        movc    %d0,%msp
        moveq   #-1,%d0
        movsb   %d0,(AC_SEGMAP+0x0)

        jbsr    sun3_init

        jbsr    base_trap_init

        jbsr    start_kernel
        trap    #15

        .data
        .even
kpt:
        .long 0
availmem:
        .long 0
| todo: remove next two. --m
is_medusa:
        .long 0
m68k_pgtable_cachemode:
        .long 0