platform.inc

eCos操作系统源码

#ifndef CYGONCE_HAL_PLATFORM_INC
#define CYGONCE_HAL_PLATFORM_INC
##=============================================================================
##
##	platform.inc
##
##	Atlas 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): 	dmoseley
## Contributors:	dmoseley
## Date:	2000-06-06
## Purpose:	Atlas board definitions.
## Description:	This file contains various definitions and macros that are
##              useful for writing assembly code for the Atlas board.
## Usage:
##		#include <cyg/hal/platform.inc>
##		...
##		
##
######DESCRIPTIONEND####
##
##=============================================================================

#include <cyg/hal/mips.inc>

#include <cyg/hal/hal_arch.h>
#include <cyg/hal/plf_io.h>

#------------------------------------------------------------------------------
# Additional bits for status register.
# We set the IM[0] bit to accept all interrupts.

#define INITIAL_SR_PLF 0x00000400

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

#define CYGPKG_HAL_RESET_VECTOR_FIRST_CODE
	.macro hal_reset_vector_first_code
        # Branch forward past the board ID register.
        b 1f
	nop
	nop
	nop
	nop
	nop
1:
	.endm

#define CYGPKG_HAL_EARLY_INIT
	.macro	hal_early_init
	# Do these initializations early (rather than in hal_memc_init) so
	# we have access to the LEDs on the board for debugging purposes.

        #
        # WARNING: THESE WRITES NEED TO HANDLE BYTE-SWAPPING PROPERLY WHEN DOING BIG-ENDIAN
        #

	#
        # Setup Galileo CPU Interface Register
        #
        # Set the WriteRate bit - ie Accept 'DDD' back-to-back transfers (see CoreLV "Users Manual")
        # All other bits stay the same
	#
 	li	k0, CYGARC_UNCACHED_ADDRESS(HAL_GALILEO_REGISTER_BASE)
	lw	k1, HAL_GALILEO_CPU_INTERFACE_CONFIG_OFFSET(k0)
	li	k0, HAL_GALILEO_CPU_WRITERATE_MASK
	or	k1, k1, k0
	li	k0, CYGARC_UNCACHED_ADDRESS(HAL_GALILEO_REGISTER_BASE)
	sw	k1, HAL_GALILEO_CPU_INTERFACE_CONFIG_OFFSET(k0)

	#
	# Use BootCS chip-select for the entire device bus region
	#
	li	k1, 0
	sw	k1, HAL_GALILEO_CS3_HIGH_DECODE_OFFSET(k0)
	li	k1, 0xf0
	sw	k1, HAL_GALILEO_CSBOOT_LOW_DECODE_OFFSET(k0)
	li	k1, 0xff
	sw	k1, HAL_GALILEO_CSBOOT_HIGH_DECODE_OFFSET(k0)
	.endm

#------------------------------------------------------------------------------
# Interrupt decode macros

# Only INTN[0] is connected on the Atlas board. We need to access the
# interrupt controller to get the actual vector number.

#ifndef CYGPKG_HAL_MIPS_INTC_INIT_DEFINED

	.macro	hal_intc_init
	mfc0	v0,status
	nop
	lui	v1,0xFFFF
	ori	v1,v1,0x04FF
	and	v0,v0,v1	# Clear the IntMask bits except IM[0]
	mtc0	v0,status
	nop
	nop
	nop
	.endm

#define CYGPKG_HAL_MIPS_INTC_INIT_DEFINED

#endif


#ifndef CYGPKG_HAL_MIPS_INTC_DECODE_DEFINED
	.macro	hal_intc_decode vnum

	mfc0	v1,status		# get status register (interrupt mask)
	mfc0	v0,cause		# get cause register
	and	v0,v0,v1		# apply interrupt mask
	andi	v1,v0,0x400		# test FPGA interrupt
	bnez	v1,0f
	 srl	v0,v0,10		# shift interrupt bits down
	andi	v0,v0,0x3f		# isolate 6 interrupt bits
	la	v1,hal_intc_translation_table
	add	v0,v0,v1		# index into table
	b	1f
	 lb	\vnum,0(v0)		# pick up vector number
    0:
	lw	v0,HAL_ATLAS_INTSTATUS	# Get interrupt status reg
	clz	v1,v0			# count leading zeros into v1
	la	v0,31			# v0 = 31
	sub	\vnum,v0,v1		# vnum = 31-v1 == vector number	
    1:
	.endm

#ifndef CYGPKG_HAL_MIPS_INTC_TRANSLATE_DEFINED
#ifdef CYGIMP_HAL_COMMON_INTERRUPTS_CHAIN
	.macro	hal_intc_translate inum,vnum
	move	\vnum,zero			# Just vector zero is supported
	.endm
#else			
	.macro	hal_intc_translate inum,vnum
	move	\vnum,\inum			# Vector == interrupt number
	.endm
#endif
#endif

	.macro	hal_intc_decode_data
hal_intc_translation_table:	
	.byte	20, 20, 20, 20
	.byte	21, 21, 21, 21
	.byte	22, 22, 22, 22
	.byte	22, 22, 22, 22
	.byte	23, 23, 23, 23
	.byte	23, 23, 23, 23
	.byte	23, 23, 23, 23
	.byte	23, 23, 23, 23
	.byte	24, 24, 24, 24
	.byte	24, 24, 24, 24
	.byte	24, 24, 24, 24
	.byte	24, 24, 24, 24
	.byte	24, 24, 24, 24
	.byte	24, 24, 24, 24
	.byte	24, 24, 24, 24
	.byte	24, 24, 24, 24
	.endm

#define CYGPKG_HAL_MIPS_INTC_DECODE_DEFINED
#define CYGPKG_HAL_MIPS_INTC_DEFINED

// We also define our own interrupt tables in platform.S...
#define CYG_HAL_MIPS_ISR_TABLES_DEFINED
			
#endif

#------------------------------------------------------------------------------
# Diagnostic macros

#ifndef CYGPKG_HAL_MIPS_DIAG_DEFINED

	.macro	hal_diag_init
	.endm

	.macro	hal_diag_excpt_start
	.endm

	.macro	hal_diag_intr_start
	.endm

	.macro	hal_diag_restore
	.endm

#define CYGPKG_HAL_MIPS_DIAG_DEFINED

#endif // ifndef CYGPKG_HAL_MIPS_DIAG_DEFINED
	
#------------------------------------------------------------------------------
# MEMC macros.
# 
	
#if defined(CYG_HAL_STARTUP_ROM)

#------------------------------------------------------------------------------
# Make sure the jump to _start in vectors.S is done uncached
#

#define CYGARC_START_FUNC_UNCACHED

	.macro	hal_memc_init
	.extern hal_atlas_init_sdram

	lar	k0,hal_atlas_init_sdram
	CYGARC_ADDRESS_REG_UNCACHED(k0)
	jalr	k0
	nop

	beqz	v0, 2f
	nop

	# Error in sizing memory
 	DEBUG_ASCII_DISPLAY(HAL_DISPLAY_ASCIIPOS0, 'M')
 	DEBUG_ASCII_DISPLAY(HAL_DISPLAY_ASCIIPOS1, 'E')
 	DEBUG_ASCII_DISPLAY(HAL_DISPLAY_ASCIIPOS2, 'M')
 	DEBUG_ASCII_DISPLAY(HAL_DISPLAY_ASCIIPOS3, 'E')
 	DEBUG_ASCII_DISPLAY(HAL_DISPLAY_ASCIIPOS4, 'R')
 	DEBUG_ASCII_DISPLAY(HAL_DISPLAY_ASCIIPOS5, 'R')
 	DEBUG_ASCII_DISPLAY(HAL_DISPLAY_ASCIIPOS6, 'O')
 	DEBUG_ASCII_DISPLAY(HAL_DISPLAY_ASCIIPOS7, 'R')
1:	b	1b
	nop

2:	# No error in sizing memory

	# Store the memory size at the base of RAM for later
	la	k0, 0x80000000
        move	k1, k0
        CYGARC_ADDRESS_REG_UNCACHED(k1)
	sw	v1, 0(k1)
	nop
	nop
	nop
	.endm

#define CYGPKG_HAL_MIPS_MEMC_DEFINED

#elif defined(CYG_HAL_STARTUP_ROMRAM)
#error ROMRAM STARTUP NOT YET IMPLEMENTED
	.macro	hal_memc_init
	.extern	hal_memc_setup

	lar	k0,hal_memc_setup
	jalr	k0
	nop

	# Having got the RAM working, we must now relocate the Entire
	# ROM into it and then continue execution from RAM.

	la	t0,0x88000000		# dest addr
	la	t1,0x80000000		# 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

	la	v0,2f			# RAM address to go to
	jr	v0
	nop
2:	
	# We are now executing out of RAM!

	.endm

#define CYGPKG_HAL_MIPS_MEMC_DEFINED

#endif	

#------------------------------------------------------------------------------
#endif // ifndef CYGONCE_HAL_PLATFORM_INC
# end of platform.inc