diff options
Diffstat (limited to 'arch/powerpc/boot/crt0.S')
| -rw-r--r-- | arch/powerpc/boot/crt0.S | 32 |
1 files changed, 29 insertions, 3 deletions
diff --git a/arch/powerpc/boot/crt0.S b/arch/powerpc/boot/crt0.S index 70e65b1..3dc8d8f 100644 --- a/arch/powerpc/boot/crt0.S +++ b/arch/powerpc/boot/crt0.S @@ -16,6 +16,7 @@ _zimage_start_opd: .long _zimage_start, 0, 0, 0 + .weak _zimage_start .globl _zimage_start _zimage_start: /* Work out the offset between the address we were linked at @@ -44,7 +45,7 @@ _zimage_start: addi r9,r9,4 bdnz 2b - /* Do a cache flush for our text, in case OF didn't */ + /* Do a cache flush for our text, in case the loader didn't */ 3: lis r9,_start@ha addi r9,r9,_start@l add r9,r0,r9 @@ -59,6 +60,31 @@ _zimage_start: sync isync - mr r6,r1 - b start + /* Clear the BSS */ + lis r9,__bss_start@ha + addi r9,r9,__bss_start@l + lis r8,_end@ha + addi r8,r8,_end@l + li r0,0 +5: stw r0,0(r9) + addi r9,r9,4 + cmplw cr0,r9,r8 + blt 5b + /* Possibly set up a custom stack */ +.weak _platform_stack_top + lis r8,_platform_stack_top@ha + addi r8,r8,_platform_stack_top@l + cmpwi r8,0 + beq 6f + lwz r1,0(r8) + li r0,0 + stwu r0,-16(r1) /* establish a stack frame */ +6: + + /* Call platform_init() */ + bl platform_init + + /* Call start */ + mr r3,r1 + b start |