platform.inc

eCos操作系统源码

#ifndef CYGONCE_HAL_PLATFORM_INC
#define CYGONCE_HAL_PLATFORM_INC
##=============================================================================
##
##	platform.inc
##
##	REFIDT334 board assembler header file
##
##=============================================================================
#####ECOSGPLCOPYRIGHTBEGIN####
## -------------------------------------------
## This file is part of eCos, the Embedded Configurable Operating System.
## Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, 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.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307 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.
##
## This exception does not invalidate any other reasons why a work based on
## this file might be covered by the GNU General Public License.
##
## Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
## at http://sources.redhat.com/ecos/ecos-license/
## -------------------------------------------
#####ECOSGPLCOPYRIGHTEND####
##=============================================================================
#######DESCRIPTIONBEGIN####
##
## Author(s): 	 tmichals
## Contributors: nickg
## Date:	 2003-02-13
## Purpose:	 IDT32334 board definitions.
## Description:	 This file contains various definitions and macros that are
##               useful for writing assembly code for the IDT32334 reference
##               board.
## Usage:
##		 #include <cyg/hal/platform.inc>
##		 ...
##		
##
######DESCRIPTIONEND####
##
##=============================================================================

#include <cyg/hal/mips.inc>

#------------------------------------------------------------------------------
# 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
	la	a0,__default_interrupt_vsr
	la	a1,__default_exception_vsr
	la	a3,hal_vsr_table
	sw	a0,0(a3)
	sw	a1,1*4(a3)
	sw	a1,2*4(a3)
	sw	a1,3*4(a3)
	sw	a1,4*4(a3)
	sw	a1,5*4(a3)
	sw	a1,6*4(a3)
	sw	a1,7*4(a3)
	sw	a1,8*4(a3)
	sw	a1,9*4(a3)
	sw	a1,10*4(a3)
	sw	a1,11*4(a3)
	sw	a1,12*4(a3)
	sw	a1,13*4(a3)
	sw	a1,14*4(a3)
	sw	a1,15*4(a3)

	sw	a1,32*4(a3)
	sw	a1,33*4(a3)
	.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
	la	a0,__default_interrupt_vsr
	la	a3,hal_vsr_table
	sw	a0,0(a3)
	.endm

#else

	.macro	hal_mon_init
	.endm

#endif
			

#define CYGPKG_HAL_MIPS_MON_DEFINED

#endif	

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

#if defined(CYGPKG_HAL_MIPS_SIM) ||        \
    ( defined(CYGPKG_HAL_MIPS_TX3904) &&   \
      defined(CYG_HAL_STARTUP_RAM) &&      \
      !defined(CYGSEM_HAL_USE_ROM_MONITOR) \
    )

## VSR table defined in linker script

#else

#define CYG_HAL_MIPS_VSR_TABLE_DEFINED

#endif

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

.macro	hal_memc_init
        .extern hal_memc_setup
        lar     t0,hal_memc_setup
        jalr    t0
        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	t0,0x80000000		# dest addr
	la	t1,0xbfc00000		# source addr
	la	t3,__ram_data_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	t0,t3,1b
	nop

/* set up and move interrupts */

/* setup and move the vector table into ram */
/* This allows execptions to happen in ROM first
** then when running in RAM, they are switched */
        mfc0    v0, status
        nop
        li      v1, ~0x00400000
        and   v0, v0,v1
        mtc0    v0, status
        nop


        la      t0, hal_vsr_table
        la      t1,__default_interrupt_vsr

        sw      t1, 0(t0)

        la      t1,__default_exception_vsr
        li      t2, 62
        li      t3, 0
        addi    t0,t0,4
12:
        sw      t1,0(t0)
        addi    t3,t3,1
        addi    t0,t0,4
        bne     t3,t2, 12b
        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
#endif
#------------------------------------------------------------------------------
#endif // ifndef CYGONCE_HAL_PLATFORM_INC
# end of platform.inc