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Avoid leaving preloaded_undi with invalid PXENV+/!PXE structure

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addresses if the signature checks fail.
This commit is contained in:
Michael Brown 2007-01-09 02:52:28 +00:00
parent 697bcc9d24
commit a2be828a33
1 changed files with 15 additions and 3 deletions
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18
src/arch/i386/prefix/pxeprefix.S
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@ -48,9 +48,9 @@ detect_pxenv:
/* Signature check */
les pxenv_segoff, %di
cmpl $0x4e455850, %es:(%di) /* 'PXEN' signature */
jne 99f
jne no_pxenv
cmpw $0x2b56, %es:4(%di) /* 'V+' signature */
jne 99f
jne no_pxenv
/* Record entry point and UNDI segments */
pushl %es:0x0a(%di) /* Entry point */
popl entry_segoff
@ -67,9 +67,15 @@ detect_pxenv:
call print_segoff
movb $',', %al
call print_character
jmp 99f
.section ".prefix.data"
10: .asciz " PXENV+ at "
.previous
no_pxenv:
xorl %eax, %eax
movl %eax, pxenv_segoff
99:
/*****************************************************************************
@ -80,7 +86,7 @@ detect_ppxe:
/* Signature check */
les ppxe_segoff, %di
cmpl $0x45585021, %es:(%di) /* '!PXE' signature */
jne 99f
jne no_ppxe
/* Record structure address, entry point, and UNDI segments */
pushw %es
popw ppxe_segment
@ -99,9 +105,15 @@ detect_ppxe:
call print_segoff
movb $',', %al
call print_character
jmp 99f
.section ".prefix.data"
10: .asciz " !PXE at "
.previous
no_ppxe:
xorl %eax, %eax
movl %eax, ppxe_segoff
99:
/*****************************************************************************