From f2cdccb23f89af493da16adadeaf97cde8c5619f Mon Sep 17 00:00:00 2001
From: bde <bde@FreeBSD.org>
Date: Mon, 11 Nov 1996 14:03:33 +0000
Subject: 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)
---
 sys/i386/boot/biosboot/bios.S | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

(limited to 'sys')

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
-- 
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