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u-boot-brain/arch/avr32/cpu/start.S
Wolfgang Denk 25ddd1fb0a Replace CONFIG_SYS_GBL_DATA_SIZE by auto-generated value 
CONFIG_SYS_GBL_DATA_SIZE has always been just a bad workarond for not
being able to use "sizeof(struct global_data)" in assembler files.
Recent experience has shown that manual synchronization is not
reliable enough.  This patch renames CONFIG_SYS_GBL_DATA_SIZE into
GENERATED_GBL_DATA_SIZE which gets automatically generated by the
asm-offsets tool.  In the result, all definitions of this value can be
deleted from the board config files.  We have to make sure that all
files that reference such data include the new <asm-offsets.h> file.

No other changes have been done yet, but it is obvious that similar
changes / simplifications can be done for other, related macro
definitions as well.

Signed-off-by: Wolfgang Denk <wd@denx.de>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
2010-10-26 21:05:30 +02:00

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6.7 KiB
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/*
* Copyright (C) 2005-2008 Atmel Corporation
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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 program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <asm-offsets.h>
#include <config.h>
#include <asm/ptrace.h>
#include <asm/sysreg.h>
#define SYSREG_MMUCR_I_OFFSET 2
#define SYSREG_MMUCR_S_OFFSET 4
#define SR_INIT (SYSREG_BIT(GM) | SYSREG_BIT(EM) | SYSREG_BIT(M0))
/* due to errata (unreliable branch folding) clear FE bit explicitly */
#define CPUCR_INIT ((SYSREG_BIT(BI) | SYSREG_BIT(BE) \
| SYSREG_BIT(RE) | SYSREG_BIT(IBE) \
| SYSREG_BIT(IEE)) & ~SYSREG_BIT(FE))
/*
* To save some space, we use the same entry point for
* exceptions and reset. This avoids lots of alignment padding
* since the reset vector is always suitably aligned.
*/
.section .exception.text, "ax", @progbits
.global _start
.global _evba
.type _start, @function
.type _evba, @function
_start:
.size _start, 0
_evba:
.org 0x00
rjmp unknown_exception /* Unrecoverable exception */
.org 0x04
rjmp unknown_exception /* TLB multiple hit */
.org 0x08
rjmp unknown_exception /* Bus error data fetch */
.org 0x0c
rjmp unknown_exception /* Bus error instruction fetch */
.org 0x10
rjmp unknown_exception /* NMI */
.org 0x14
rjmp unknown_exception /* Instruction address */
.org 0x18
rjmp unknown_exception /* ITLB protection */
.org 0x1c
rjmp unknown_exception /* Breakpoint */
.org 0x20
rjmp unknown_exception /* Illegal opcode */
.org 0x24
rjmp unknown_exception /* Unimplemented instruction */
.org 0x28
rjmp unknown_exception /* Privilege violation */
.org 0x2c
rjmp unknown_exception /* Floating-point */
.org 0x30
rjmp unknown_exception /* Coprocessor absent */
.org 0x34
rjmp unknown_exception /* Data Address (read) */
.org 0x38
rjmp unknown_exception /* Data Address (write) */
.org 0x3c
rjmp unknown_exception /* DTLB Protection (read) */
.org 0x40
rjmp unknown_exception /* DTLB Protection (write) */
.org 0x44
rjmp unknown_exception /* DTLB Modified */
.org 0x50 /* ITLB Miss */
pushm r8-r12,lr
rjmp 1f
.org 0x60 /* DTLB Miss (read) */
pushm r8-r12,lr
rjmp 1f
.org 0x70 /* DTLB Miss (write) */
pushm r8-r12,lr
1: mov r12, sp
rcall mmu_handle_tlb_miss
popm r8-r12,lr
brne unknown_exception
rete
.size _evba, . - _evba
.align 2
.type unknown_exception, @function
unknown_exception:
/* Figure out whether we're handling an exception (Exception
* mode) or just booting (Supervisor mode). */
csrfcz SYSREG_M1_OFFSET
brcc at32ap_cpu_bootstrap
/* This is an exception. Complain. */
pushm r0-r12
sub r8, sp, REG_R12 - REG_R0 - 4
mov r9, lr
mfsr r10, SYSREG_RAR_EX
mfsr r11, SYSREG_RSR_EX
pushm r8-r11
mfsr r12, SYSREG_ECR
mov r11, sp
rcall do_unknown_exception
1: rjmp 1b
/* The COUNT/COMPARE timer interrupt handler */
.global timer_interrupt_handler
.type timer_interrupt_handler,@function
.align 2
timer_interrupt_handler:
/*
* Increment timer_overflow and re-write COMPARE with 0xffffffff.
*
* We're running at interrupt level 3, so we don't need to save
* r8-r12 or lr to the stack.
*/
lda.w r8, timer_overflow
ld.w r9, r8[0]
mov r10, -1
mtsr SYSREG_COMPARE, r10
sub r9, -1
st.w r8[0], r9
rete
/*
* CPU bootstrap after reset is handled here. SoC code may
* override this in case they need to initialize oscillators,
* etc.
*/
.section .text.at32ap_cpu_bootstrap, "ax", @progbits
.global at32ap_cpu_bootstrap
.weak at32ap_cpu_bootstrap
.type at32ap_cpu_bootstrap, @function
.align 2
at32ap_cpu_bootstrap:
/* Reset the Status Register */
mov r0, lo(SR_INIT)
orh r0, hi(SR_INIT)
mtsr SYSREG_SR, r0
/* Reset CPUCR and invalidate the BTB */
mov r2, CPUCR_INIT
mtsr SYSREG_CPUCR, r2
/* Flush the caches */
mov r1, 0
cache r1[4], 8
cache r1[0], 0
sync 0
/* Reset the MMU to default settings */
mov r0, SYSREG_BIT(MMUCR_S) | SYSREG_BIT(MMUCR_I)
mtsr SYSREG_MMUCR, r0
/* Internal RAM should not need any initialization. We might
have to initialize external RAM here if the part doesn't
have internal RAM (or we may use the data cache) */
/* Jump to cacheable segment */
lddpc pc, 1f
.align 2
1: .long at32ap_low_level_init
.size _start, . - _start
/* Common CPU bootstrap code after oscillator/cache/etc. init */
.section .text.avr32ap_low_level_init, "ax", @progbits
.global at32ap_low_level_init
.type at32ap_low_level_init, @function
.align 2
at32ap_low_level_init:
lddpc sp, sp_init
/* Initialize the GOT pointer */
lddpc r6, got_init
3: rsub r6, pc
/* Let's go */
rjmp board_init_f
.align 2
.type sp_init,@object
sp_init:
.long CONFIG_SYS_INIT_SP_ADDR
got_init:
.long 3b - _GLOBAL_OFFSET_TABLE_
/*
* void relocate_code(new_sp, new_gd, monitor_addr)
*
* Relocate the u-boot image into RAM and continue from there.
* Does not return.
*/
.section .text.relocate_code,"ax",@progbits
.global relocate_code
.type relocate_code,@function
relocate_code:
mov sp, r12 /* use new stack */
mov r12, r11 /* save new_gd */
mov r11, r10 /* save destination address */
/* copy .text section and flush the cache along the way */
lda.w r8, _text
lda.w r9, _etext
sub lr, r10, r8 /* relocation offset */
1: ldm r8++, r0-r3
stm r10, r0-r3
sub r10, -16
ldm r8++, r0-r3
stm r10, r0-r3
sub r10, -16
cp.w r8, r9
cache r10[-4], 0x0d /* dcache clean/invalidate */
cache r10[-4], 0x01 /* icache invalidate */
brlt 1b
/* flush write buffer */
sync 0
/* copy data sections */
lda.w r9, _edata
1: ld.d r0, r8++
st.d r10++, r0
cp.w r8, r9
brlt 1b
/* zero out .bss */
mov r0, 0
mov r1, 0
lda.w r9, _end
sub r9, r8
1: st.d r10++, r0
sub r9, 8
brgt 1b
/* jump to RAM */
sub r0, pc, . - in_ram
add pc, r0, lr
.align 2
in_ram:
/* find the new GOT and relocate it */
lddpc r6, got_init_reloc
3: rsub r6, pc
mov r8, r6
lda.w r9, _egot
lda.w r10, _got
sub r9, r10
1: ld.w r0, r8[0]
add r0, lr
st.w r8++, r0
sub r9, 4
brgt 1b
/* Move the exception handlers */
mfsr r2, SYSREG_EVBA
add r2, lr
mtsr SYSREG_EVBA, r2
/* Do the rest of the initialization sequence */
call board_init_r
.align 2
got_init_reloc:
.long 3b - _GLOBAL_OFFSET_TABLE_
.size relocate_code, . - relocate_code
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