[PATCH] ppc64 boot: use memset to clear bss
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>
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2 changed files with 3 additions and 19 deletions
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@ -25,24 +25,5 @@ _start:
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sync
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isync
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## Clear out the BSS as per ANSI C requirements
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lis r7,_end@ha
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addi r7,r7,_end@l # r7 = &_end
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lis r8,__bss_start@ha #
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addi r8,r8,__bss_start@l # r8 = &_bss_start
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## Determine how large an area, in number of words, to clear
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subf r7,r8,r7 # r7 = &_end - &_bss_start + 1
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addi r7,r7,3 # r7 += 3
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srwi. r7,r7,2 # r7 = size in words.
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beq 3f # If the size is zero, don't bother
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addi r8,r8,-4 # r8 -= 4
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mtctr r7 # SPRN_CTR = number of words to clear
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li r0,0 # r0 = 0
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2: stwu r0,4(r8) # Clear out a word
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bdnz 2b # Keep clearing until done
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3:
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b start
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@ -26,6 +26,7 @@ extern void flush_cache(void *, unsigned long);
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#define ONE_MB 0x100000
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extern char _start[];
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extern char __bss_start[];
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extern char _end[];
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extern char _vmlinux_start[];
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extern char _vmlinux_end[];
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@ -138,6 +139,8 @@ void start(unsigned long a1, unsigned long a2, void *promptr)
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Elf64_Ehdr *elf64;
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Elf64_Phdr *elf64ph;
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memset(__bss_start, 0, _end - __bss_start);
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prom = (int (*)(void *)) promptr;
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chosen_handle = finddevice("/chosen");
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if (chosen_handle == (void *) -1)
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