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Diffstat (limited to 'arch/mips/cpu/mips32/start.S')
-rw-r--r--arch/mips/cpu/mips32/start.S119
1 files changed, 55 insertions, 64 deletions
diff --git a/arch/mips/cpu/mips32/start.S b/arch/mips/cpu/mips32/start.S
index 0a9d9d596..5d7467d02 100644
--- a/arch/mips/cpu/mips32/start.S
+++ b/arch/mips/cpu/mips32/start.S
@@ -62,11 +62,11 @@
.globl _start
.text
_start:
- RVECENT(reset,0) /* U-boot entry point */
- RVECENT(reset,1) /* software reboot */
-#if defined(CONFIG_INCA_IP)
- .word INFINEON_EBU_BOOTCFG /* EBU init code, fetched during booting */
- .word 0x00000000 /* phase of the flash */
+ RVECENT(reset,0) # U-boot entry point
+ RVECENT(reset,1) # software reboot
+#ifdef CONFIG_INCA_IP
+ .word INFINEON_EBU_BOOTCFG # EBU init code, fetched during
+ .word 0x00000000 # booting phase of the flash
#else
RVECENT(romReserved,2)
#endif
@@ -131,7 +131,7 @@ _start:
RVECENT(romReserved,61)
RVECENT(romReserved,62)
RVECENT(romReserved,63)
- XVECENT(romExcHandle,0x200) /* bfc00200: R4000 tlbmiss vector */
+ XVECENT(romExcHandle,0x200) # bfc00200: R4000 tlbmiss vector
RVECENT(romReserved,65)
RVECENT(romReserved,66)
RVECENT(romReserved,67)
@@ -147,7 +147,7 @@ _start:
RVECENT(romReserved,77)
RVECENT(romReserved,78)
RVECENT(romReserved,79)
- XVECENT(romExcHandle,0x280) /* bfc00280: R4000 xtlbmiss vector */
+ XVECENT(romExcHandle,0x280) # bfc00280: R4000 xtlbmiss vector
RVECENT(romReserved,81)
RVECENT(romReserved,82)
RVECENT(romReserved,83)
@@ -163,7 +163,7 @@ _start:
RVECENT(romReserved,93)
RVECENT(romReserved,94)
RVECENT(romReserved,95)
- XVECENT(romExcHandle,0x300) /* bfc00300: R4000 cache vector */
+ XVECENT(romExcHandle,0x300) # bfc00300: R4000 cache vector
RVECENT(romReserved,97)
RVECENT(romReserved,98)
RVECENT(romReserved,99)
@@ -179,7 +179,7 @@ _start:
RVECENT(romReserved,109)
RVECENT(romReserved,110)
RVECENT(romReserved,111)
- XVECENT(romExcHandle,0x380) /* bfc00380: R4000 general vector */
+ XVECENT(romExcHandle,0x380) # bfc00380: R4000 general vector
RVECENT(romReserved,113)
RVECENT(romReserved,114)
RVECENT(romReserved,115)
@@ -196,19 +196,19 @@ _start:
RVECENT(romReserved,126)
RVECENT(romReserved,127)
- /* We hope there are no more reserved vectors!
+ /*
+ * We hope there are no more reserved vectors!
* 128 * 8 == 1024 == 0x400
* so this is address R_VEC+0x400 == 0xbfc00400
*/
.align 4
reset:
- /* Clear watch registers.
- */
+ /* Clear watch registers */
mtc0 zero, CP0_WATCHLO
mtc0 zero, CP0_WATCHHI
- /* WP(Watch Pending), SW0/1 should be cleared. */
+ /* WP(Watch Pending), SW0/1 should be cleared */
mtc0 zero, CP0_CAUSE
setup_c0_status_reset
@@ -217,47 +217,42 @@ reset:
mtc0 zero, CP0_COUNT
mtc0 zero, CP0_COMPARE
-#if !defined(CONFIG_SKIP_LOWLEVEL_INIT)
+#ifndef CONFIG_SKIP_LOWLEVEL_INIT
/* CONFIG0 register */
li t0, CONF_CM_UNCACHED
mtc0 t0, CP0_CONFIG
-#endif /* !CONFIG_SKIP_LOWLEVEL_INIT */
+#endif
- /* Initialize $gp.
- */
+ /* Initialize $gp */
bal 1f
- nop
+ nop
.word _gp
1:
lw gp, 0(ra)
-#if !defined(CONFIG_SKIP_LOWLEVEL_INIT)
- /* Initialize any external memory.
- */
+#ifndef CONFIG_SKIP_LOWLEVEL_INIT
+ /* Initialize any external memory */
la t9, lowlevel_init
jalr t9
- nop
+ nop
- /* Initialize caches...
- */
+ /* Initialize caches... */
la t9, mips_cache_reset
jalr t9
- nop
+ nop
- /* ... and enable them.
- */
+ /* ... and enable them */
li t0, CONF_CM_CACHABLE_NONCOHERENT
mtc0 t0, CP0_CONFIG
-#endif /* !CONFIG_SKIP_LOWLEVEL_INIT */
+#endif
- /* Set up temporary stack.
- */
+ /* Set up temporary stack */
li t0, CONFIG_SYS_SDRAM_BASE + CONFIG_SYS_INIT_SP_OFFSET
la sp, 0(t0)
la t9, board_init_f
jr t9
- nop
+ nop
/*
* void relocate_code (addr_sp, gd, addr_moni)
@@ -272,13 +267,13 @@ reset:
.globl relocate_code
.ent relocate_code
relocate_code:
- move sp, a0 /* Set new stack pointer */
+ move sp, a0 # set new stack pointer
li t0, CONFIG_SYS_MONITOR_BASE
la t3, in_ram
- lw t2, -12(t3) /* t2 <-- uboot_end_data */
+ lw t2, -12(t3) # t2 <-- uboot_end_data
move t1, a2
- move s2, a2 /* s2 <-- destination address */
+ move s2, a2 # s2 <-- destination address
/*
* Fix $gp:
@@ -287,8 +282,8 @@ relocate_code:
*/
move t6, gp
sub gp, CONFIG_SYS_MONITOR_BASE
- add gp, a2 /* gp now adjusted */
- sub s1, gp, t6 /* s1 <-- relocation offset */
+ add gp, a2 # gp now adjusted
+ sub s1, gp, t6 # s1 <-- relocation offset
/*
* t0 = source address
@@ -299,30 +294,28 @@ relocate_code:
/*
* Save destination address and size for later usage in flush_cache()
*/
- move s0, a1 /* save gd in s0 */
- move a0, t1 /* a0 <-- destination addr */
- sub a1, t2, t0 /* a1 <-- size */
+ move s0, a1 # save gd in s0
+ move a0, t1 # a0 <-- destination addr
+ sub a1, t2, t0 # a1 <-- size
1:
lw t3, 0(t0)
sw t3, 0(t1)
addu t0, 4
ble t0, t2, 1b
- addu t1, 4 /* delay slot */
+ addu t1, 4
- /* If caches were enabled, we would have to flush them here.
- */
+ /* If caches were enabled, we would have to flush them here. */
/* a0 & a1 are already set up for flush_cache(start, size) */
la t9, flush_cache
jalr t9
- nop
+ nop
- /* Jump to where we've relocated ourselves.
- */
+ /* Jump to where we've relocated ourselves */
addi t0, s2, in_ram - _start
jr t0
- nop
+ nop
.word _gp
.word _GLOBAL_OFFSET_TABLE_
@@ -337,45 +330,43 @@ in_ram:
* GOT[0] is reserved. GOT[1] is also reserved for the dynamic object
* generated by GNU ld. Skip these reserved entries from relocation.
*/
- lw t3, -4(t0) /* t3 <-- num_got_entries */
- lw t4, -16(t0) /* t4 <-- _GLOBAL_OFFSET_TABLE_ */
- lw t5, -20(t0) /* t5 <-- _gp */
- sub t4, t5 /* compute offset*/
- add t4, t4, gp /* t4 now holds relocated _GLOBAL_OFFSET_TABLE_ */
- addi t4, t4, 8 /* Skipping first two entries. */
+ lw t3, -4(t0) # t3 <-- num_got_entries
+ lw t4, -16(t0) # t4 <-- _GLOBAL_OFFSET_TABLE_
+ lw t5, -20(t0) # t5 <-- _gp
+ sub t4, t5 # compute offset
+ add t4, t4, gp # t4 now holds relocated _G_O_T_
+ addi t4, t4, 8 # skipping first two entries
li t2, 2
1:
lw t1, 0(t4)
beqz t1, 2f
- add t1, s1
+ add t1, s1
sw t1, 0(t4)
2:
addi t2, 1
blt t2, t3, 1b
- addi t4, 4 /* delay slot */
+ addi t4, 4
- /* Clear BSS.
- */
- lw t1, -12(t0) /* t1 <-- uboot_end_data */
- lw t2, -8(t0) /* t2 <-- uboot_end */
- add t1, s1 /* adjust pointers */
+ /* Clear BSS */
+ lw t1, -12(t0) # t1 <-- uboot_end_data
+ lw t2, -8(t0) # t2 <-- uboot_end
+ add t1, s1 # adjust pointers
add t2, s1
sub t1, 4
1:
addi t1, 4
bltl t1, t2, 1b
- sw zero, 0(t1) /* delay slot */
+ sw zero, 0(t1)
- move a0, s0 /* a0 <-- gd */
+ move a0, s0 # a0 <-- gd
la t9, board_init_r
jr t9
- move a1, s2 /* delay slot */
+ move a1, s2
.end relocate_code
- /* Exception handlers.
- */
+ /* Exception handlers */
romReserved:
b romReserved
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