summaryrefslogtreecommitdiff
path: root/cpu/at32ap/start.S
diff options
context:
space:
mode:
authorPeter Tyser <ptyser@xes-inc.com>2010-04-12 22:28:15 -0500
committerWolfgang Denk <wd@denx.de>2010-04-13 09:13:25 +0200
commit8a15c2d10b0b784f0cfba1240f06a4d933b975fa (patch)
treeef8243267f89fb66a5ff9f3085b80199dfa31599 /cpu/at32ap/start.S
parent1e3827d9cf9442e188604fd1099ac38375135125 (diff)
downloadu-boot-imx-8a15c2d10b0b784f0cfba1240f06a4d933b975fa.zip
u-boot-imx-8a15c2d10b0b784f0cfba1240f06a4d933b975fa.tar.gz
u-boot-imx-8a15c2d10b0b784f0cfba1240f06a4d933b975fa.tar.bz2
avr32: Move cpu/at32ap/* to arch/avr32/cpu/*
Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
Diffstat (limited to 'cpu/at32ap/start.S')
-rw-r--r--cpu/at32ap/start.S275
1 files changed, 0 insertions, 275 deletions
diff --git a/cpu/at32ap/start.S b/cpu/at32ap/start.S
deleted file mode 100644
index d37a46e..0000000
--- a/cpu/at32ap/start.S
+++ /dev/null
@@ -1,275 +0,0 @@
-/*
- * 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 <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))
-#define CPUCR_INIT (SYSREG_BIT(BI) | SYSREG_BIT(BE) \
- | SYSREG_BIT(FE) | SYSREG_BIT(RE) \
- | SYSREG_BIT(IBE) | SYSREG_BIT(IEE))
-
- /*
- * 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
- rjmp unknown_exception /* ITLB Miss */
- .org 0x60
- rjmp unknown_exception /* DTLB Miss (read) */
- .org 0x70
- rjmp unknown_exception /* DTLB Miss (write) */
-
- .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