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[int13] Do not zero %edx when jumping to a boot sector

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Commit 73eb3f1 ("[int13] Zero all possible registers when jumping to a
boot sector") introduced a regression preventing the SAN-booting of
boot sectors which rely upon %dl containing the correct drive number
(such as most CD-ROM boot sectors).

Fix by not zeroing %edx.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2012-10-05 15:02:30 +01:00
parent bab0a4c1ce
commit fcdfe81764
1 changed files with 1 additions and 1 deletions
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2
src/arch/i386/image/bootsector.c
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@ -87,7 +87,7 @@ int call_bootsector ( unsigned int segment, unsigned int offset,
"xorl %%eax, %%eax\n\t"
"xorl %%ebx, %%ebx\n\t"
"xorl %%ecx, %%ecx\n\t"
"xorl %%edx, %%edx\n\t"
/* %edx contains drive number */
"xorl %%esi, %%esi\n\t"
"xorl %%edi, %%edi\n\t"
"xorl %%ebp, %%ebp\n\t"