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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2008 by Marcoen Hirschberg
*
* This program 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
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#include "cpu.h"
.section .init.text,"ax",%progbits
.global start
start:
/* Exception vectors */
/*
* reset vector *MUST* use relative-addressing only
* the MMU might not be enabled yet, and the PC might point to
* a memory region not present in the linked binary
*/
b newstart
b undef_instr_handler
b software_int_handler
b prefetch_abort_handler
b data_abort_handler
b reserved_handler
b irq_handler
b fiq_handler
_vectorsend:
.text
newstart:
msr cpsr_c, #0xd3 /* enter supervisor mode, disable IRQ/FIQ */
#if CONFIG_CPU == AS3525 || CONFIG_CPU == AS3525v2
bl memory_init
#endif
#ifdef USE_IRAM
/* Zero out IBSS */
ldr r2, =_iedata
ldr r3, =_iend
mov r4, #0
1:
cmp r3, r2
strhi r4, [r2], #4
bhi 1b
/* Copy the IRAM */
/* must be done before bss is zeroed */
ldr r2, =_iramcopy
ldr r3, =_iramstart
ldr r4, =_iramend
1:
cmp r4, r3
ldrhi r5, [r2], #4
strhi r5, [r3], #4
bhi 1b
#endif
#ifdef HAVE_INIT_ATTR
/* copy init data to codec buffer */
/* must be done before bss is zeroed */
ldr r2, =_initcopy
ldr r3, =_initstart
ldr r4, =_initend
1:
cmp r4, r3
ldrhi r5, [r2], #4
strhi r5, [r3], #4
bhi 1b
mov r2, #0
mcr p15, 0, r2, c7, c5, 0 @ Invalidate ICache
#endif
/* Initialise bss section to zero */
ldr r2, =_edata
ldr r3, =_end
mov r4, #0
1:
cmp r3, r2
strhi r4, [r2], #4
bhi 1b
/* Set up stack for IRQ mode */
msr cpsr_c, #0xd2
ldr sp, =irq_stack
msr cpsr_c, #0xd3
#if CONFIG_CPU == AS3525 || CONFIG_CPU == AS3525v2
/* Let abort and undefined modes use irq stack */
/* svc stack is for interrupt processing */
ldr sp, =svc_stack
#else
/* Let svc, abort and undefined modes use irq stack */
ldr sp, =irq_stack
/* Set up stack for FIQ mode */
msr cpsr_c, #0xd1
ldr sp, =fiq_stack
#endif
msr cpsr_c, #0xd7
ldr sp, =irq_stack
msr cpsr_c, #0xdb
ldr sp, =irq_stack
/* Switch to sys mode */
msr cpsr_c, #0xdf
/* Set up some stack and munge it with 0xdeadbeef */
ldr sp, =stackend
ldr r2, =stackbegin
ldr r3, =0xdeadbeef
1:
cmp sp, r2
strhi r3, [r2], #4
bhi 1b
ldr ip, =main @ make sure we are using the virtual address
bx ip
/* Cache-align interrupt stacks */
.balign 32
/* 256 words of IRQ stack */
.space 256*4
irq_stack:
/* 256 words of FIQ/SVC stack */
.space 256*4
fiq_stack:
svc_stack:
end:
|
