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[PATCH] ppc64 boot: use memset to clear bss

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Use memset to clear bss, instead of own version.

Signed-off-by: Olaf Hering <olh@suse.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Anton Blanchard <anton@samba.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Olaf Hering 2005-10-28 17:46:45 -07:00 committed by Paul Mackerras
parent 06cf26beff
commit 9b0cbe9756
2 changed files with 3 additions and 19 deletions
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19
arch/ppc64/boot/crt0.S
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@ -25,24 +25,5 @@ _start:
sync
isync
## Clear out the BSS as per ANSI C requirements
lis r7,_end@ha
addi r7,r7,_end@l # r7 = &_end
lis r8,__bss_start@ha #
addi r8,r8,__bss_start@l # r8 = &_bss_start
## Determine how large an area, in number of words, to clear
subf r7,r8,r7 # r7 = &_end - &_bss_start + 1
addi r7,r7,3 # r7 += 3
srwi. r7,r7,2 # r7 = size in words.
beq 3f # If the size is zero, don't bother
addi r8,r8,-4 # r8 -= 4
mtctr r7 # SPRN_CTR = number of words to clear
li r0,0 # r0 = 0
2: stwu r0,4(r8) # Clear out a word
bdnz 2b # Keep clearing until done
3:
b start

3
arch/ppc64/boot/main.c
View file

@ -26,6 +26,7 @@ extern void flush_cache(void *, unsigned long);
#define ONE_MB 0x100000
extern char _start[];
extern char __bss_start[];
extern char _end[];
extern char _vmlinux_start[];
extern char _vmlinux_end[];
@ -138,6 +139,8 @@ void start(unsigned long a1, unsigned long a2, void *promptr)
Elf64_Ehdr *elf64;
Elf64_Phdr *elf64ph;
memset(__bss_start, 0, _end - __bss_start);
prom = (int (*)(void *)) promptr;
chosen_handle = finddevice("/chosen");
if (chosen_handle == (void *) -1)