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[pcbios] Save/restore %es in INT 15,e820

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Our INT 15,e820 code was setting %es=%ss (as part of the "look ahead
in the memory map" logic), but failing to restore %es afterwards.
This is a serious bug, but wasn't affecting many platforms because
almost all callers seem to set %es=%ss anyway.
This commit is contained in:
Michael Brown 2008-09-29 00:36:11 +01:00
parent e3c5507178
commit 50dc9344b7
1 changed files with 2 additions and 0 deletions
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src/arch/i386/firmware/pcbios/e820mangler.S
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@ -436,6 +436,7 @@ get_mangled_e820:
/* Peek ahead to see if there are any further nonempty regions */
pushal
pushw %es
subw $20, %sp
movl $0xe820, %eax
movl $SMAP, %edx
@ -445,6 +446,7 @@ get_mangled_e820:
movw %sp, %di
call get_nonempty_e820
addr32 leal 20(%esp), %esp /* avoid changing flags */
popw %es
popal
jnc 99f /* There are further nonempty regions */