/*
- * Copyright (C) 2005-2006 Atmel Corporation
+ * Copyright (C) 2005-2008 Atmel Corporation
*
* See file CREDITS for list of people who contributed to this
* project.
* MA 02111-1307 USA
*/
#include <config.h>
+#include <asm/ptrace.h>
#include <asm/sysreg.h>
-#ifndef PART_SPECIFIC_BOOTSTRAP
-# define PART_SPECIFIC_BOOTSTRAP
-#endif
-
#define SYSREG_MMUCR_I_OFFSET 2
#define SYSREG_MMUCR_S_OFFSET 4
| SYSREG_BIT(FE) | SYSREG_BIT(RE) \
| SYSREG_BIT(IBE) | SYSREG_BIT(IEE))
- .text
+ /*
+ * 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:
- PART_SPECIFIC_BOOTSTRAP
+ .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)
lddpc pc, 1f
.align 2
-1: .long 2f
+1: .long at32ap_low_level_init
+ .size _start, . - _start
-2: lddpc sp, sp_init
-
- /*
- * Relocate the data section and initialize .bss. Everything
- * is guaranteed to be at least doubleword aligned by the
- * linker script.
- */
- lddpc r12, .Ldata_vma
- lddpc r11, .Ldata_lma
- lddpc r10, .Ldata_end
- sub r10, r12
-4: ld.d r8, r11++
- sub r10, 8
- st.d r12++, r8
- brne 4b
-
- mov r8, 0
- mov r9, 0
- lddpc r10, .Lbss_end
- sub r10, r12
-4: sub r10, 8
- st.d r12++, r8
- brne 4b
+ /* 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
- ld.w pc, r6[board_init_f@got]
+
+ /* Let's go */
+ rjmp board_init_f
.align 2
.type sp_init,@object
sp_init:
- .long CFG_INIT_SP_ADDR
+ .long CONFIG_SYS_INIT_SP_ADDR
got_init:
.long 3b - _GLOBAL_OFFSET_TABLE_
-.Ldata_lma:
- .long __data_lma
-.Ldata_vma:
- .long _data
-.Ldata_end:
- .long _edata
-.Lbss_end:
- .long _end
+
+ /*
+ * 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
projects / platform / kernel / u-boot.git / blobdiff