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Libpayload needs to clear the bss region.

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Libpayload shouldn't count on coreboot or other payloads to clear memory. This fixes problems with payloads being loaded after or on top of each other.

Change-Id: I30303d47e465e8921f47acab667c7998ba79fca7
Signed-off-by: Marc Jones <marcj303@gmail.com>
Reviewed-on: http://review.coreboot.org/66
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Marc Jones
2011-06-28 14:30:05 -06:00
parent 3e706b63c0
commit 55bf2e49d6
1 changed files with 8 additions and 1 deletions
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9
payloads/libpayload/arch/i386/head.S
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@@ -70,10 +70,17 @@ _init:
movl %esp, %esi movl %esp, %esi
/* Store EAX and EBX */ /* Store EAX and EBX */
movl %eax,loader_eax movl %eax,loader_eax
movl %ebx,loader_ebx movl %ebx,loader_ebx
/* Clear the bss */
cld
movl $.bss, %edi
movl $_end, %ecx
subl %edi, %ecx
xor %ax, %ax
rep stosb
/* Setup new stack. */ /* Setup new stack. */
movl $_stack, %ebx movl $_stack, %ebx