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x86, boot: zero EFLAGS on 32 bits

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The 64-bit code already clears EFLAGS as soon as it has a stack.  This
seems like a reasonable precaution, so do it on 32 bits as well.

[ Impact: extra paranoia ]

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin
2009-05-06 17:56:51 -07:00
parent 0a13773670
commit 9754191278
1 changed files with 4 additions and 0 deletions
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4
arch/x86/boot/compressed/head_32.S
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@@ -91,6 +91,10 @@ ENTRY(startup_32)
/* Set up the stack */ /* Set up the stack */
leal boot_stack_end(%ebx), %esp leal boot_stack_end(%ebx), %esp
/* Zero EFLAGS */
pushl $0
popfl
/* /*
* Copy the compressed kernel to the end of our buffer * Copy the compressed kernel to the end of our buffer
* where decompression in place becomes safe. * where decompression in place becomes safe.