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[romprefix] Fix incorrect pointer offset in undiloader.S

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Commit 2422647 ("[prefix] Allow prefix to specify an arbitrary maximum
address for relocation") introduced a regression into the UNDI ROM
loader by preserving an extra register on the stack without modifying
the %sp-relative addresses used in the routine.

Fix by correcting the %sp-relative addresses to allow for the extra
preserved variable.

Signed-off-by: Frediano Ziglio <frediano.ziglio@citrix.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Frediano Ziglio 2013-05-14 14:06:25 +01:00 committed by Michael Brown
parent 05d11b7337
commit 9df238a8aa
1 changed files with 2 additions and 2 deletions
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4
src/arch/i386/prefix/undiloader.S
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@ -23,8 +23,8 @@ undiloader:
popw %ds
/* UNDI loader parameter structure address into %es:%di */
movw %sp, %bx
movw %ss:18(%bx), %di
movw %ss:20(%bx), %es
movw %ss:22(%bx), %di
movw %ss:24(%bx), %es
/* Install to specified real-mode addresses */
pushw %di
movw %es:12(%di), %bx