Subversion Repositories openrisc

#ifndef CYGONCE_HAL_PLATFORM_INC

#define CYGONCE_HAL_PLATFORM_INC

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

##

##      platform.inc

##

##      REF4955/TX4955 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,jskov

## Date:        2000-05-15

## Purpose:     REF4955/TX4955 board definitions.

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

##              useful for writing assembly code for the REF4955/TX4955 board.

## Usage:

##              #include 

##              ...

##

##

######DESCRIPTIONEND####

##

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

#include 

#include 

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

# Macro for copying vectors to RAM if necessary.

#if !defined(CYGSEM_HAL_USE_ROM_MONITOR)

        .macro  hal_vectors_init

        # If we don~t play nice with a ROM monitor, copy the required

        # vectors into the proper location.

        la      t0,0x80000000           # dest addr

        la      t1,utlb_vector          # source addr

        la      t3,utlb_vector_end      # end dest addr

1:

        lw      v0,0(t1)                # get word

        addi    t1,t1,4

        sw      v0,0(t0)                # write word

        addi    t0,t0,4

        bne     t1,t3,1b

         nop

        la      t0,0x80000180           # dest addr

        la      t1,other_vector         # source addr

        la      t3,other_vector_end     # end dest addr

1:

        lw      v0,0(t1)                # get word

        addi    t1,t1,4

        sw      v0,0(t0)                # write word

        addi    t0,t0,4

        bne     t1,t3,1b

         nop

        .set mips3                      # Set ISA to MIPS 3 to allow cache insns

        # Now clear the region in the caches

        la      t0,0x80000000           # dest addr

        ori     t1,t0,0x200             # source addr

1:      cache   0x01,0(t0)              # Flush word from data cache

        cache   0x01,1(t0)

        cache   0x01,2(t0)

        cache   0x01,3(t0)

        nop

        cache   0x00,0(t0)              # Invalidate icache for word

        cache   0x00,1(t0)

        cache   0x00,2(t0)

        cache   0x00,3(t0)

        nop

        addi    t0,t0,0x20

        bne     t0,t1,1b

         nop

        .set mips0                      # reset ISA to default

        .endm

#else

        .macro  hal_vectors_init

        .endm

#endif

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

# Monitor initialization.

#ifndef CYGPKG_HAL_MIPS_MON_DEFINED

#if     defined(CYG_HAL_STARTUP_ROM) ||                 \

        (       defined(CYG_HAL_STARTUP_RAM) &&         \

                !defined(CYGSEM_HAL_USE_ROM_MONITOR))

        # If we are starting up from ROM, or we are starting in

        # RAM and NOT using a ROM monitor, initialize the VSR table.

        .macro  hal_mon_init

        hal_vectors_init

        # Set default exception VSR for all vectors

        ori     a0,zero,CYGNUM_HAL_VSR_COUNT

        la      a1,__default_exception_vsr

        la      a2,hal_vsr_table

1:      sw      a1,0(a2)

        addi    a2,a2,4

        addi    a0,a0,-1

        bne     a0,zero,1b

         nop

        # Now set special VSRs

        la      a0,hal_vsr_table

        # Set interrupt VSR

        la      a1,__default_interrupt_vsr

        sw      a1,CYGNUM_HAL_VECTOR_INTERRUPT*4(a0)

        # Add special handler on breakpoint vector to allow GDB and

        # GCC to both use 'break' without conflicts.

        la      a1,__break_vsr_springboard

        sw      a1,CYGNUM_HAL_VECTOR_BREAKPOINT*4(a0)

        # Set exception handler on special vectors

        # FIXME: Should use proper definitions

        la      a1,__default_exception_vsr

        sw      a1,32*4(a0)             # debug

        sw      a1,33*4(a0)             # utlb

        sw      a1,34*4(a0)             # nmi

        .endm

#elif defined(CYG_HAL_STARTUP_RAM) && defined(CYGSEM_HAL_USE_ROM_MONITOR)

        # Initialize the VSR table entries

        # We only take control of the interrupt vector,

        # the rest are left to the ROM for now...

        .macro  hal_mon_init

        hal_vectors_init

        # Set interrupt VSR

        la      a0,hal_vsr_table

        la      a1,__default_interrupt_vsr

        sw      a1,CYGNUM_HAL_VECTOR_INTERRUPT*4(a0)

        .endm

#else

        .macro  hal_mon_init

        hal_vectors_init

        .endm

#endif

#define CYGPKG_HAL_MIPS_MON_DEFINED

#endif

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

#if !defined(CYG_HAL_STARTUP_RAM)

        .macro  hal_memc_init

        // Only initialize the SDRAM controller when running in ROM

        .extern hal_memc_setup

        lar     t0,hal_memc_setup

        jalr    t0

        nop

        .endm

#define CYGPKG_HAL_MIPS_MEMC_DEFINED

#endif

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

# Decide whether the VSR table is defined externally, or is to be defined

# here.

## 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

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

## For chaining, use the calculated cause vector number.

#ifdef CYGIMP_HAL_COMMON_INTERRUPTS_CHAIN

        .macro  hal_intc_translate inum,vnum

        move    \vnum,\inum                     # Vector == interrupt number

        .endm

#define CYGPKG_HAL_MIPS_INTC_TRANSLATE_DEFINED

#endif

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

#ifdef CYG_STARTUP_ROM

## Initial SR value for use in ROM:

## CP0 usable

## Vectors in RAM

## FP registers are 32 bit

## All hw ints disabled

#define INITIAL_SR      0x30000000

#else

## Initial SR value for use standalone:

## CP0 usable

## Vectors to RAM

## FP registers are 32 bit

## All hw ints disabled

#define INITIAL_SR      0x30000000

#endif

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

#endif // ifndef CYGONCE_HAL_PLATFORM_INC

# end of platform.inc