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| author | bde <bde@FreeBSD.org> | 1996-11-11 14:03:33 +0000 |
|---|---|---|
| committer | bde <bde@FreeBSD.org> | 1996-11-11 14:03:33 +0000 |
| commit | f2cdccb23f89af493da16adadeaf97cde8c5619f (patch) | |
| tree | 77f6828b97fde7c1817251b9c06749de3d6ac60a /sys | |
| parent | 1a0d3a30c746937f9ad3e0557735fa024ffcea8a (diff) | |
| download | FreeBSD-src-f2cdccb23f89af493da16adadeaf97cde8c5619f.zip FreeBSD-src-f2cdccb23f89af493da16adadeaf97cde8c5619f.tar.gz | |
Preserve %esi and %edi for all BIOS calls. This is probably only necessary
for get_diskinfo(), whose BIOS call sets %es:%edi in some cases, although
most documentation says that it doesn't change %edi in the cases that
happened to matter (for hard disks).
This shall be in 2.1.6 and 2.2.
Submitted by: Tor.Egge@idt.ntnu.no
(except I kept the unnecessary preservation of %edx and %ecx)
Diffstat (limited to 'sys')
| -rw-r--r-- | sys/i386/boot/biosboot/bios.S | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/sys/i386/boot/biosboot/bios.S b/sys/i386/boot/biosboot/bios.S index 3a45e85..a3ff7e2 100644 --- a/sys/i386/boot/biosboot/bios.S +++ b/sys/i386/boot/biosboot/bios.S @@ -24,7 +24,7 @@ * the rights to redistribute these changes. * * from: Mach, Revision 2.2 92/04/04 11:34:26 rpd - * $Id: bios.S,v 1.4 1994/11/18 05:02:12 phk Exp $ + * $Id: bios.S,v 1.5 1995/09/03 05:36:13 julian Exp $ */ /* @@ -75,6 +75,8 @@ ENTRY(biosread) mov %esp, %ebp push %ebx + push %esi + push %edi push %ecx push %edx push %es @@ -112,6 +114,8 @@ ENTRY(biosread) pop %es pop %edx pop %ecx + pop %edi + pop %esi pop %ebx pop %ebp @@ -132,6 +136,8 @@ ENTRY(putc) push %ebp mov %esp, %ebp push %ebx + push %esi + push %edi push %ecx movb 0x8(%ebp), %cl @@ -150,6 +156,8 @@ ENTRY(putc) call EXT(real_to_prot) pop %ecx + pop %edi + pop %esi pop %ebx pop %ebp ret @@ -167,6 +175,8 @@ ENTRY(getc) push %ebp mov %esp, %ebp push %ebx /* save %ebx */ + push %esi + push %edi call EXT(prot_to_real) @@ -183,6 +193,8 @@ ENTRY(getc) xor %eax, %eax movb %bl, %al + pop %edi + pop %esi pop %ebx pop %ebp ret @@ -203,6 +215,8 @@ ENTRY(ischar) push %ebp mov %esp, %ebp push %ebx + push %esi + push %edi call EXT(prot_to_real) /* enter real mode */ @@ -222,6 +236,8 @@ nochar: xor %eax, %eax movb %bl, %al + pop %edi + pop %esi pop %ebx pop %ebp ret @@ -238,6 +254,8 @@ ENTRY(get_diskinfo) mov %esp, %ebp push %es push %ebx + push %esi + push %edi push %ecx push %edx @@ -290,6 +308,8 @@ ok: pop %edx pop %ecx + pop %edi + pop %esi pop %ebx pop %es pop %ebp @@ -309,6 +329,8 @@ ENTRY(memsize) push %ebp mov %esp, %ebp push %ebx + push %esi + push %edi mov 8(%ebp), %ebx @@ -336,6 +358,8 @@ xdone: call EXT(real_to_prot) mov %ebx, %eax + pop %edi + pop %esi pop %ebx pop %ebp ret |
