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#ifndef CYGONCE_HAL_PLATFORM_INC

#define CYGONCE_HAL_PLATFORM_INC

##=============================================================================

##

##      platform.inc

##

##      DDB-VRC4373 board assembler header file

##

##=============================================================================

## ####ECOSGPLCOPYRIGHTBEGIN####

## -------------------------------------------

## This file is part of eCos, the Embedded Configurable Operating System.

## Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.

##

## eCos is free software; you can redistribute it and/or modify it under

## the terms of the GNU General Public License as published by the Free

## Software Foundation; either version 2 or (at your option) any later

## version.

##

## eCos is distributed in the hope that it will be useful, but WITHOUT

## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

## FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

## for more details.

##

## You should have received a copy of the GNU General Public License

## along with eCos; if not, write to the Free Software Foundation, Inc.,

## 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

##

## As a special exception, if other files instantiate templates or use

## macros or inline functions from this file, or you compile this file

## and link it with other works to produce a work based on this file,

## this file does not by itself cause the resulting work to be covered by

## the GNU General Public License. However the source code for this file

## must still be made available in accordance with section (3) of the GNU

## General Public License v2.

##

## This exception does not invalidate any other reasons why a work based

## on this file might be covered by the GNU General Public License.

## -------------------------------------------

## ####ECOSGPLCOPYRIGHTEND####

##=============================================================================

#######DESCRIPTIONBEGIN####

##

## Author(s):   nickg

## Contributors:        nickg

## Date:        1999-04-06

## Purpose:     VRC4373 board definitions.

## Description: This file contains various definitions and macros that are

##              useful for writing assembly code for the VRC4373 board.

## Usage:

##              #include 

##              ...

##

##

######DESCRIPTIONEND####

##

##=============================================================================

#include 

##-----------------------------------------------------------------------------

## VRC4372 registers

#define CYGHWR_HAL_MIPS_VRC4373_BASE            0xbc000000

#define CYGHWR_HAL_MIPS_VRC4373_INTC_POL        (CYGHWR_HAL_MIPS_VRC4373_BASE+0x200)

#define CYGHWR_HAL_MIPS_VRC4373_INTC_TRIG       (CYGHWR_HAL_MIPS_VRC4373_BASE+0x204)

#define CYGHWR_HAL_MIPS_VRC4373_INTC_PINS       (CYGHWR_HAL_MIPS_VRC4373_BASE+0x208)

#define CYGHWR_HAL_MIPS_VRC4373_INTC_MASK0      (CYGHWR_HAL_MIPS_VRC4373_BASE+0x20c)

#define CYGHWR_HAL_MIPS_VRC4373_INTC_STAT0      (CYGHWR_HAL_MIPS_VRC4373_BASE+0x210)

#define CYGHWR_HAL_MIPS_VRC4373_INTC_MASK1      (CYGHWR_HAL_MIPS_VRC4373_BASE+0x214)

#define CYGHWR_HAL_MIPS_VRC4373_INTC_STAT1      (CYGHWR_HAL_MIPS_VRC4373_BASE+0x218)

#define CYGHWR_HAL_MIPS_VRC4373_INTC_MASK2      (CYGHWR_HAL_MIPS_VRC4373_BASE+0x21c)

#define CYGHWR_HAL_MIPS_VRC4373_INTC_STAT2      (CYGHWR_HAL_MIPS_VRC4373_BASE+0x220)

##-----------------------------------------------------------------------------

## configure the architecture HAL to define the right things.

## ISR tables are defined in platform.S

#define CYG_HAL_MIPS_ISR_TABLES_DEFINED

## VSR table is at a fixed RAM address defined by the linker script

#define CYG_HAL_MIPS_VSR_TABLE_DEFINED

##-----------------------------------------------------------------------------

#if defined(CYGSEM_HAL_USE_ROM_MONITOR_PMON)

## Initial SR value for use with PMON:

## CP0 usable

## Vectors to RAM

## All hw ints disabled

#define INITIAL_SR_PLF  0x10000000

#elif defined(CYGSEM_HAL_USE_ROM_MONITOR_GDB_stubs)

## Initial SR value for use with GDB stubs:

## CP0 and CP1 usable

## FP registers are 64 bit

## Vectors to RAM

## All hw ints disabled

#define INITIAL_SR_PLF  0x34000000

#else

## Initial SR value for use standalone:

## CP0 usable

## Vectors to RAM

## All hw ints disabled

#define INITIAL_SR_PLF  0x10000000

#endif

#------------------------------------------------------------------------------

## Load Address and Relocate. This macro is used in code that may be

## linked to execute out of RAM but is actually executed from ROM. The

## code that initializes the memory controller and copies the ROM

## contents to RAM must work in this way, for example. This macro is used

## in place of an "la" macro instruction when loading code and data

## addresses.  There are two versions of the macro here. The first

## assumes that we are executing in the ROM space at 0xbfc00000 and are

## linked to run in the RAM space at 0x80000000.  It simply adds the

## difference between the two to the loaded address.  The second is more

## code, but will execute correctly at either location since it

## calculates the difference at runtime.  The second variant is enabled

## by default.

#ifdef CYG_HAL_STARTUP_ROMRAM

#if 0

        .macro  lar     reg,addr

        .set    noat

        la      \reg,\addr

        la      $at,0x3fc00000

        addu    \reg,\reg,$at

        .set    at

        .endm

#else

        .macro  lar     reg,addr

        .set    noat

        move    $at,ra                  # save ra

        la      \reg,\addr              # get address into register

        la      ra,x\@                  # get linked address of label

        subu    \reg,\reg,ra            # subtract it from value

        bal     x\@                     # branch and link to label

        nop                             #  to get current actual address

x\@:

        addu    \reg,\reg,ra            # add actual address

        move    ra,$at                  # restore ra

        .set    at

        .endm

#endif

#define CYGPKG_HAL_MIPS_LAR_DEFINED

#endif

#------------------------------------------------------------------------------

# MMU macros.

# The MMU must be set up on this board before we can access any external devices,

# including the memory controller, so we have no RAM to work with yet.

# Since the setup code must work only in registers, we do not do a subroutine

# linkage here, instead the setup code knows to jump back here when finished.

#if defined(CYG_HAL_STARTUP_ROM) || defined(CYG_HAL_STARTUP_ROMRAM)

        .macro  hal_mmu_init

        .extern hal_mmu_setup

        lar     k0,hal_mmu_setup

        jr      k0

        nop

        .global hal_mmu_setup_return

hal_mmu_setup_return:

        .endm

#define CYGPKG_HAL_MIPS_MMU_DEFINED

#endif

#------------------------------------------------------------------------------

# MEMC macros.

#

#if defined(CYG_HAL_STARTUP_ROM) || defined(CYG_HAL_STARTUP_ROMRAM)

        .macro  hal_memc_init

        .extern hal_memc_setup

        lar     k0,hal_memc_setup

        jalr    k0

        nop

#if defined(CYG_HAL_STARTUP_ROMRAM)

        # Having got the RAM working, we must now relocate the Entire

        # ROM into it and then continue execution from RAM.

        la      t0,reset_vector         # dest addr

        lar     t1,reset_vector         # source addr

        la      t3,__ram_data_end       # end dest addr

1:

        lw      v0,0(t1)                # get word

        sw      v0,0(t0)                # write word

        addiu   t1,t1,4

        addiu   t0,t0,4

        bne     t0,t3,1b

        nop

        la      v0,2f                   # RAM address to go to

        jr      v0

        nop

2:

        # We are now executing out of RAM!

#endif

        .endm

#define CYGPKG_HAL_MIPS_MEMC_DEFINED

#endif

#------------------------------------------------------------------------------

# Interrupt controller initialization.

        # initialize all interrupts to disabled

        .macro  hal_intc_init

        mfc0    v0,status

        nop

        la      v1,0xFFFF00FF

        and     v0,v0,v1                # clear the IntMask bits

        ori     v0,v0,0x3800            # set 3 IPL bits

        mtc0    v0,status

        nop

        nop

        nop

        # mask them all in the VRC4372 interrupt controller too,

        # and write zeros to the status registers to clear any

        # pending interrupts.

        la      v0,CYGHWR_HAL_MIPS_VRC4373_INTC_MASK0

        sw      zero,0(v0)

        sw      zero,4(v0)

        sw      zero,8(v0)

        sw      zero,12(v0)

        sw      zero,16(v0)

        sw      zero,20(v0)

        .endm

#define CYGPKG_HAL_MIPS_INTC_INIT_DEFINED

#------------------------------------------------------------------------------

# Interrupt Translator.

# This translates an interrupt number into an ISR table offset. Vector 0

# contains a special ISR for dealing with spurious interrupts from the

# Vrc437x, and vectors 1-3 contain springboards, so we chain via vector 4.

# This macro translates interrupt 0 to vector 0 and all others to vector 4.

#ifndef CYGPKG_HAL_MIPS_INTC_TRANSLATE_DEFINED

#ifdef CYGIMP_HAL_COMMON_INTERRUPTS_CHAIN

        .macro  hal_intc_translate inum,vnum

        beqz    \inum,1f        # jump if interrupt is zero

         move   v0,zero         # set v0=0 in delay slot

        addi    v0,v0,4         # non zero vector, inc v0

1:      move    \vnum,v0        # store 0 or 4 in vnum

        .endm

#define CYGPKG_HAL_MIPS_INTC_TRANSLATE_DEFINED

#endif

#endif

#------------------------------------------------------------------------------

# Monitor initialization.

#ifndef CYGPKG_HAL_MIPS_MON_DEFINED

        .macro  hal_mon_init

        hal_mon_copy_trampoline

        hal_mon_init_vsr_table

        .endm

#if defined(CYGSEM_HAL_USE_ROM_MONITOR_PMON)

        # Copy the other_vector trampoline code into the RAM

        # area so we intercept all interrupts.

        .macro  hal_mon_copy_trampoline

        la      a0,other_vector

        la      a1,other_vector_end

        la      t0,0xa0000180

1:

        lw      v0,0(a0)

        sw      v0,0(t0)

        addiu   a0,a0,4

        bne     a0,a1,1b

        addiu   t0,t0,4

        .endm

        # plant a pointer to the breakpoint springboard into the

        # correct vsr table slot.

        .macro  hal_mon_init_vsr_table

        .extern hal_breakpoint_springboard

        la      v1,hal_vsr_table

        # Plant the interrupt VSR

        la      v0,__default_interrupt_vsr

        sw      v0,(0*4)(v1)

        # And the breakpoint VSR

        la      v0,hal_breakpoint_springboard

        sw      v0,(9*4)(v1)

        # Temporarily also plant all the others, so all exceptions

        # go to PMON.

        sw      v0,(4*4)(v1)

        sw      v0,(5*4)(v1)

        sw      v0,(6*4)(v1)

        sw      v0,(7*4)(v1)

        sw      v0,(8*4)(v1)

        sw      v0,(10*4)(v1)

        sw      v0,(11*4)(v1)

        sw      v0,(12*4)(v1)

        sw      v0,(13*4)(v1)

        sw      v0,(14*4)(v1)

        sw      v0,(15*4)(v1)

        .endm

#elif defined(CYGSEM_HAL_USE_ROM_MONITOR_GDB_stubs)

        # The stubs have a trampoline of their own installed which

        # already goes through the VSR table.

        .macro  hal_mon_copy_trampoline

        .endm

        # plant a pointer to the interrupt VSR handler in the

        # correct vsr table slot. Leave the rest for the monitor.

        .macro  hal_mon_init_vsr_table

        la      v0,__default_interrupt_vsr

        la      v1,hal_vsr_table

        sw      v0,(0*4)(v1)

        # plant a pointer to our own bus error handler. See the

        # comments in platform.S.

        .extern hal_bus_error_vsr

        la      v0,hal_bus_error_vsr

        sw      v0,(7*4)(v1)

        .endm

#else

        # The other_vector trampoline is already installed as part of

        # the executable image. However, the TLB exception is, in RAM

        # in the analogous place to the reset vector in ROM. In a

        # ROM or ROMRAM startup we need to copy it into place.

#if defined(CYG_HAL_STARTUP_ROM) || defined(CYG_HAL_STARTUP_ROMRAM)

        .macro  hal_mon_copy_trampoline

        la      a0,utlb_vector

        la      a1,utlb_vector_end

        la      t0,0xa0000000

1:

        lw      v0,0(a0)

        sw      v0,0(t0)

        sw      v0,0x80(t0)

        addiu   a0,a0,4

        bne     a0,a1,1b

        addiu   t0,t0,4

#if defined(CYG_HAL_STARTUP_ROM)

        la      a0,other_vector

        la      a1,other_vector_end

        la      t0,0xa0000180

1:

        lw      v0,0(a0)

        sw      v0,0(t0)

        addiu   a0,a0,4

        bne     a0,a1,1b

        addiu   t0,t0,4

#endif

        .endm

#else

        .macro  hal_mon_copy_trampoline

        .endm

#endif

        # Fill the VSR table with the default VSRs.

        # If we contain the stubs, the default VSR will pass

        # exceptions on to the stubs.

        .macro  hal_mon_init_vsr_table

        la      v0,__default_exception_vsr

        la      v1,hal_vsr_table

        sw      v0,(1*4)(v1)

        sw      v0,(2*4)(v1)

        sw      v0,(3*4)(v1)

        sw      v0,(4*4)(v1)

        sw      v0,(5*4)(v1)

        sw      v0,(6*4)(v1)

#       sw      v0,(7*4)(v1)    # Bus error

        sw      v0,(8*4)(v1)

        sw      v0,(9*4)(v1)

        sw      v0,(10*4)(v1)

        sw      v0,(11*4)(v1)

        sw      v0,(12*4)(v1)

        sw      v0,(13*4)(v1)

        sw      v0,(14*4)(v1)

        sw      v0,(15*4)(v1)

        sw      v0,(23*4)(v1)

        sw      v0,(24*4)(v1)

#       sw      v0,(32*4)(v1)   # debug

        sw      v0,(33*4)(v1)   # utlb

        sw      v0,(34*4)(v1)   # nmi

        la      v0,__default_interrupt_vsr

        sw      v0,(0*4)(v1)

        # plant a pointer to our own bus error handler. See the

        # comments in platform.S.

        .extern hal_bus_error_vsr

        la      v0,hal_bus_error_vsr

        sw      v0,(7*4)(v1)

        .endm

#endif

#define CYGPKG_HAL_MIPS_MON_DEFINED

#endif

#------------------------------------------------------------------------------

# Diagnostic macros

#ifndef CYGPKG_HAL_MIPS_DIAG_DEFINED

#if 0

        # This code generates characters and hex values to a

        # Grammar Engine PromICE AI interface.

#define AILOC   0xbfc70000

        .macro  hal_diag_init

        la      v0,AILOC

1:

        lbu     v1,3(v0)

        nop ; nop ; nop

        subu    v1,0xCC

        beqz    v1,1b

        nop

        lbu     v1,2(v0)

        b       9f

        nop

        .global hal_diag_ai_write_char

hal_diag_ai_write_char:

        .set    noat

        la      v0,AILOC        # v0 = AI location

1:

        lbu     v1,3(v0)        # v1 = status register

        nop ; nop ; nop

        andi    v1,v1,1         # v1 = TDA bit

        bnez    v1,1b           # loop while non-zero

        nop

        sll     a0,a0,1         # a0 = a0<<1

        ori     a0,a0,0x0201    # or in start and stop bits

        li      $at,10          # we have 10 bits to send

2:

        andi    v1,a0,1         # v1 = ls bit of char

        add     v1,v0,v1        # v1 = address of ZERO or ONE register

        lbu     zero,0(v1)      # read it to send bit

        la      v1,100          # delay a bit to let PROMICE deal with it

3:      bnez    v1,3b           # loop while non-zero

        add     v1,v1,-1        # decrement in delay slot

        srl     a0,a0,1         # a0 = a0>>1

        subu    $at,1           # decrement count

        bnez    $at,2b          # loop while non-zero

        nop

        jr      ra              # all done, return

        nop

        .set    at

        .global hal_diag_ai_write_hex1

hal_diag_ai_write_hex1:

        la      v0,9

        andi    a0,a0,0xf

        ble     a0,v0,1f

        nop

        addi    a0,a0,('A'-'9'-1)

1:      addi    a0,a0,'0'

        b       hal_diag_ai_write_char

        nop

        .global hal_diag_ai_write_hex2

hal_diag_ai_write_hex2:

        move    t0,ra           # save ra

        move    t1,a0           # save arg

        srl     a0,a0,4         # ms nibble

        bal     hal_diag_ai_write_hex1

        nop

        move    a0,t1           # retrieve a0

        move    ra,t0           # retrieve ra

        b       hal_diag_ai_write_hex1

        nop

        .global hal_diag_ai_write_hex4

hal_diag_ai_write_hex4:

        move    t2,ra           # save ra

        move    t3,a0           # save arg

        srl     a0,a0,8         # ms byte

        bal     hal_diag_ai_write_hex2

        nop

        move    a0,t3           # retrieve a0

        move    ra,t2           # retrieve ra

        b       hal_diag_ai_write_hex2

        nop

        .global hal_diag_ai_write_hex8

hal_diag_ai_write_hex8:

        move    t4,ra           # save ra

        move    t5,a0           # save arg

        srl     a0,a0,16        # ms short

        bal     hal_diag_ai_write_hex4

        nop

        move    a0,t5           # retrieve a0

        move    ra,t4           # retrieve ra

        b       hal_diag_ai_write_hex4

        nop

9:

        # Output a '!' to check that the interface is working

        li      a0,'!'

        bal     hal_diag_ai_write_char

        nop

        .endm

        # Utility macro to emit a character

        .macro  hal_diag_writec char

        .extern hal_diag_ai_write_char

        la      a0,\char

        lar     v0,hal_diag_ai_write_char

        jalr    v0

#       bal     hal_diag_ai_write_char

        nop

        .endm

#if 0

        # This macro outputs a '+', the exception number as a

        # character offset from 'A' and the exception address

        # in hex.

        .macro  hal_diag_excpt_start

        hal_diag_writec '+'

        srl     k0,k0,2

        addi    a0,k0,'A'

        jal     hal_diag_ai_write_char

        nop

        move    a0,t6                   # we know t6 contains the epc value

        jal     hal_diag_ai_write_hex8

        nop

        .endm

#else

        .macro  hal_diag_excpt_start

        .endm

#endif

#if 0

        # This macro outputs a '=' and the vector number as a

        # character offset from 'A'.

        .macro  hal_diag_intr_start

        .extern hal_diag_ai_write_char

        hal_diag_writec '='

        addi    a0,s2,'A'

        jal     hal_diag_ai_write_char

        nop

        .endm

#else

        .macro  hal_diag_intr_start

        .endm

#endif

#if 0

        .macro  hal_diag_restore

        hal_diag_writec '^'

        lw      a0,mipsreg_pc(sp)

        lar     k0,hal_diag_ai_write_hex8

        jalr    k0

        .endm

#else

        .macro  hal_diag_restore

        .endm

#endif

#define CYGPKG_HAL_MIPS_DIAG_DEFINED

#elif 0

#define DELAY(n) \

        li      $at,n;          \

9:      bnez    $at,9b;         \

        subu    $at,1;          \

 /* Zilog Access Delay */

#define DELZ            DELAY( (200) )

        .macro  hal_diag_init

        la      v0,0xc2000000

        DELZ

        lbu     v1,8(v0)

        andi    v1,v1,0xfc

        DELZ

        sb      v1,8(v0)

        .endm

        .macro  hal_diag_excpt_start

        .endm

        .macro  hal_diag_intr_start

        la      v0,0xc2000000

        DELZ

        lbu     v1,8(v0)

        xori    v1,v1,0x01

        DELZ

        sb      v1,8(v0)

        .endm

        .macro  hal_diag_restore

        la      v0,0xc2000000

        DELZ

        lbu     v1,8(v0)

        xori    v1,v1,0x01

        DELZ

        sb      v1,8(v0)

#       li      a0,0x0310                       # a0 = type = INTR,RAISE

#       lw      a1,mipsreg_sr(sp)               # a1 = sr

#       mfc0    a2,status

#       jal     cyg_instrument                  # call instrument function

#       nop

        .endm

#define CYGPKG_HAL_MIPS_DIAG_DEFINED

#endif

#endif

#------------------------------------------------------------------------------

#endif // ifndef CYGONCE_HAL_PLATFORM_INC

# end of platform.inc