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authorwdenk <wdenk>2004-02-08 19:38:38 +0000
committerwdenk <wdenk>2004-02-08 19:38:38 +0000
commitf6e20fc6ca5a45316f94743d8b60dce4d9766bc8 (patch)
treecdea7c7227b937ff231d98e50e64b6fa447bacda /cpu/arm720t
parentf4863a7aec41f1f78fe93eade700b15b287a5ef7 (diff)
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Patch by Anders Larsen, 09 Jan 2004:
ARM memory layout fixes: the abort-stack is now set up in the correct RAM area, and the BSS is zeroed out as it should be. Furthermore, the magic variables 'armboot_end' and 'armboot_end_data' of the linker scripts are replaced by '__bss_start' and '_end', resp., which is a further step to eliminate unnecessary differences between the implementation of the CPU architectures.
Diffstat (limited to 'cpu/arm720t')
-rw-r--r--cpu/arm720t/cpu.c2
-rw-r--r--cpu/arm720t/start.S46
2 files changed, 29 insertions, 19 deletions
diff --git a/cpu/arm720t/cpu.c b/cpu/arm720t/cpu.c
index b6fcef9..5637eb6 100644
--- a/cpu/arm720t/cpu.c
+++ b/cpu/arm720t/cpu.c
@@ -87,7 +87,7 @@ int cpu_init (void)
#ifdef CONFIG_USE_IRQ
DECLARE_GLOBAL_DATA_PTR;
- IRQ_STACK_START = _armboot_start - CFG_MALLOC_LEN - CFG_GBL_DATA_LEN - 4;
+ IRQ_STACK_START = _armboot_start - CFG_MALLOC_LEN - CFG_GBL_DATA_SIZE - 4;
FIQ_STACK_START = IRQ_STACK_START - CONFIG_STACKSIZE_IRQ;
#endif
return 0;
diff --git a/cpu/arm720t/start.S b/cpu/arm720t/start.S
index 8ddb0c9..7fe36c6 100644
--- a/cpu/arm720t/start.S
+++ b/cpu/arm720t/start.S
@@ -63,7 +63,7 @@ _fiq: .word fiq
*
* Startup Code (reset vector)
*
- * do important init only if we don't start from memory!
+ * do important init only if we don't start from RAM!
* relocate armboot to ram
* setup stack
* jump to second stage
@@ -79,16 +79,15 @@ _armboot_start:
.word _start
/*
- * Note: _armboot_end_data and _armboot_end are defined
- * by the (board-dependent) linker script.
- * _armboot_end_data is the first usable FLASH address after armboot
+ * These are defined in the board-specific linker script.
*/
-.globl _armboot_end_data
-_armboot_end_data:
- .word armboot_end_data
-.globl _armboot_end
-_armboot_end:
- .word armboot_end
+.globl _bss_start
+_bss_start:
+ .word __bss_start
+
+.globl _bss_end
+_bss_end:
+ .word _end
#ifdef CONFIG_USE_IRQ
/* IRQ stack memory (calculated at run-time) */
@@ -131,7 +130,7 @@ relocate: /* relocate U-Boot to RAM */
beq stack_setup
ldr r2, _armboot_start
- ldr r3, _armboot_end
+ ldr r3, _bss_start
sub r2, r3, r2 /* r2 <- size of armboot */
add r2, r0, r2 /* r2 <- source end address */
@@ -151,6 +150,17 @@ stack_setup:
#endif
sub sp, r0, #12 /* leave 3 words for abort-stack */
+clear_bss:
+ ldr r0, _bss_start /* find start of bss segment */
+ add r0, r0, #4 /* start at first byte of bss */
+ ldr r1, _bss_end /* stop here */
+ mov r2, #0x00000000 /* clear */
+
+clbss_l:str r2, [r0] /* clear loop... */
+ add r0, r0, #4
+ cmp r0, r1
+ bne clbss_l
+
ldr pc, _start_armboot
_start_armboot: .word start_armboot
@@ -225,7 +235,7 @@ cpu_init_crit:
/*
* before relocating, we have to setup RAM timing
- * because memory timing is board-dependend, you will
+ * because memory timing is board-dependent, you will
* find a memsetup.S in your board directory.
*/
mov ip, lr
@@ -281,9 +291,9 @@ cpu_init_crit:
stmia sp, {r0 - r12} @ Calling r0-r12
add r8, sp, #S_PC
- ldr r2, _armboot_end
- add r2, r2, #CONFIG_STACKSIZE
- sub r2, r2, #8
+ ldr r2, _armboot_start
+ sub r2, r2, #(CONFIG_STACKSIZE+CFG_MALLOC_LEN)
+ sub r2, r2, #(CFG_GBL_DATA_SIZE+8) @ set base 2 words into abort stack
ldmia r2, {r2 - r4} @ get pc, cpsr, old_r0
add r0, sp, #S_FRAME_SIZE @ restore sp_SVC
@@ -314,9 +324,9 @@ cpu_init_crit:
.endm
.macro get_bad_stack
- ldr r13, _armboot_end @ setup our mode stack
- add r13, r13, #CONFIG_STACKSIZE @ resides at top of normal stack
- sub r13, r13, #8
+ ldr r13, _armboot_start @ setup our mode stack
+ sub r13, r13, #(CONFIG_STACKSIZE+CFG_MALLOC_LEN)
+ sub r13, r13, #(CFG_GBL_DATA_SIZE+8) @ reserved a couple spots in abort stack
str lr, [r13] @ save caller lr / spsr
mrs lr, spsr