summaryrefslogtreecommitdiff
path: root/cpu/arm920t/start.S
diff options
context:
space:
mode:
Diffstat (limited to 'cpu/arm920t/start.S')
-rw-r--r--cpu/arm920t/start.S63
1 files changed, 33 insertions, 30 deletions
diff --git a/cpu/arm920t/start.S b/cpu/arm920t/start.S
index 27f38b8..114427a 100644
--- a/cpu/arm920t/start.S
+++ b/cpu/arm920t/start.S
@@ -37,7 +37,7 @@
.globl _start
-_start: b start_code
+_start: b start_code
ldr pc, _undefined_instruction
ldr pc, _software_interrupt
ldr pc, _prefetch_abort
@@ -109,13 +109,13 @@ start_code:
/*
* set the cpu to SVC32 mode
*/
- mrs r0,cpsr
- bic r0,r0,#0x1f
- orr r0,r0,#0xd3
- msr cpsr,r0
+ mrs r0, cpsr
+ bic r0, r0, #0x1f
+ orr r0, r0, #0xd3
+ msr cpsr, r0
- bl coloured_LED_init
- bl red_LED_on
+ bl coloured_LED_init
+ bl red_LED_on
#if defined(CONFIG_AT91RM9200DK) || defined(CONFIG_AT91RM9200EK)
/*
@@ -135,19 +135,19 @@ copyex:
/* turn off the watchdog */
# if defined(CONFIG_S3C2400)
-# define pWTCON 0x15300000
-# define INTMSK 0x14400008 /* Interupt-Controller base addresses */
+# define pWTCON 0x15300000
+# define INTMSK 0x14400008 /* Interupt-Controller base addresses */
# define CLKDIVN 0x14800014 /* clock divisor register */
#else
-# define pWTCON 0x53000000
-# define INTMSK 0x4A000008 /* Interupt-Controller base addresses */
+# define pWTCON 0x53000000
+# define INTMSK 0x4A000008 /* Interupt-Controller base addresses */
# define INTSUBMSK 0x4A00001C
# define CLKDIVN 0x4C000014 /* clock divisor register */
# endif
- ldr r0, =pWTCON
- mov r1, #0x0
- str r1, [r0]
+ ldr r0, =pWTCON
+ mov r1, #0x0
+ str r1, [r0]
/*
* mask all IRQs by setting all bits in the INTMR - default
@@ -180,8 +180,8 @@ copyex:
relocate: /* relocate U-Boot to RAM */
adr r0, _start /* r0 <- current position of code */
ldr r1, _TEXT_BASE /* test if we run from flash or RAM */
- cmp r0, r1 /* don't reloc during debug */
- beq stack_setup
+ cmp r0, r1 /* don't reloc during debug */
+ beq stack_setup
ldr r2, _armboot_start
ldr r3, _bss_start
@@ -198,8 +198,8 @@ copy_loop:
/* Set up the stack */
stack_setup:
ldr r0, _TEXT_BASE /* upper 128 KiB: relocated uboot */
- sub r0, r0, #CONFIG_SYS_MALLOC_LEN /* malloc area */
- sub r0, r0, #CONFIG_SYS_GBL_DATA_SIZE /* bdinfo */
+ sub r0, r0, #CONFIG_SYS_MALLOC_LEN /* malloc area */
+ sub r0, r0, #CONFIG_SYS_GBL_DATA_SIZE /* bdinfo */
#ifdef CONFIG_USE_IRQ
sub r0, r0, #(CONFIG_STACKSIZE_IRQ+CONFIG_STACKSIZE_FIQ)
#endif
@@ -297,8 +297,8 @@ cpu_init_crit:
#define S_R1 4
#define S_R0 0
-#define MODE_SVC 0x13
-#define I_BIT 0x80
+#define MODE_SVC 0x13
+#define I_BIT 0x80
/*
* use bad_save_user_regs for abort/prefetch/undef/swi ...
@@ -311,7 +311,8 @@ cpu_init_crit:
ldr r2, _armboot_start
sub r2, r2, #(CONFIG_STACKSIZE)
sub r2, r2, #(CONFIG_SYS_MALLOC_LEN)
- sub r2, r2, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ set base 2 words into abort stack
+ /* set base 2 words into abort stack */
+ sub r2, r2, #(CONFIG_SYS_GBL_DATA_SIZE+8)
ldmia r2, {r2 - r3} @ get pc, cpsr
add r0, sp, #S_FRAME_SIZE @ restore sp_SVC
@@ -324,12 +325,12 @@ cpu_init_crit:
.macro irq_save_user_regs
sub sp, sp, #S_FRAME_SIZE
stmia sp, {r0 - r12} @ Calling r0-r12
- add r7, sp, #S_PC
- stmdb r7, {sp, lr}^ @ Calling SP, LR
- str lr, [r7, #0] @ Save calling PC
- mrs r6, spsr
- str r6, [r7, #4] @ Save CPSR
- str r0, [r7, #8] @ Save OLD_R0
+ add r7, sp, #S_PC
+ stmdb r7, {sp, lr}^ @ Calling SP, LR
+ str lr, [r7, #0] @ Save calling PC
+ mrs r6, spsr
+ str r6, [r7, #4] @ Save CPSR
+ str r0, [r7, #8] @ Save OLD_R0
mov r0, sp
.endm
@@ -338,18 +339,20 @@ cpu_init_crit:
mov r0, r0
ldr lr, [sp, #S_PC] @ Get PC
add sp, sp, #S_FRAME_SIZE
- subs pc, lr, #4 @ return & move spsr_svc into cpsr
+ /* return & move spsr_svc into cpsr */
+ subs pc, lr, #4
.endm
.macro get_bad_stack
ldr r13, _armboot_start @ setup our mode stack
sub r13, r13, #(CONFIG_STACKSIZE)
sub r13, r13, #(CONFIG_SYS_MALLOC_LEN)
- sub r13, r13, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ reserved a couple spots in abort stack
+ /* reserve a couple spots in abort stack */
+ sub r13, r13, #(CONFIG_SYS_GBL_DATA_SIZE+8)
str lr, [r13] @ save caller lr / spsr
mrs lr, spsr
- str lr, [r13, #4]
+ str lr, [r13, #4]
mov r13, #MODE_SVC @ prepare SVC-Mode
@ msr spsr_c, r13