[OpenBSD]

Make boot code use real mode with 64K segments instead of 1M
segments.  Improves stability with some disk controller cards.
Also explicitly state operand size on some moves.

Bump version on boot, cdboot and pxeboot accordingly.

"just get them in" beck@ ok weingart@

5 files changed, 43 insertions, 38 deletions

diff --git a/sys/arch/i386/stand/boot/conf.c b/sys/arch/i386/stand/boot/conf.c
index 8fe3b541c12..83ee99bd8d5 100644
--- a/sys/arch/i386/stand/boot/conf.c
+++ b/sys/arch/i386/stand/boot/conf.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: conf.c,v 1.28 2004/03/19 13:48:19 tom Exp $	*/
+/*	$OpenBSD: conf.c,v 1.29 2005/04/25 23:09:04 tom Exp $	*/
 
 /*
  * Copyright (c) 1996 Michael Shalayeff
@@ -43,7 +43,7 @@
 #include <dev/cons.h>
 #include "debug.h"
 
-const char version[] = "2.06";
+const char version[] = "2.07";
 int	debug = 1;
 
 
diff --git a/sys/arch/i386/stand/cdboot/conf.c b/sys/arch/i386/stand/cdboot/conf.c
index d51dd50e1e9..9e58b036577 100644
--- a/sys/arch/i386/stand/cdboot/conf.c
+++ b/sys/arch/i386/stand/cdboot/conf.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: conf.c,v 1.1 2004/06/23 00:21:49 tom Exp $	*/
+/*	$OpenBSD: conf.c,v 1.2 2005/04/25 23:09:04 tom Exp $	*/
 
 /*
  * Copyright (c) 2004 Tom Cosgrove
@@ -43,7 +43,7 @@
 #include <dev/cons.h>
 #include "debug.h"
 
-const char version[] = "1.00";
+const char version[] = "1.01";
 int	debug = 1;
 
 #undef _TEST
diff --git a/sys/arch/i386/stand/libsa/gidt.S b/sys/arch/i386/stand/libsa/gidt.S
index f4a51db396a..a1621b5d754 100644
--- a/sys/arch/i386/stand/libsa/gidt.S
+++ b/sys/arch/i386/stand/libsa/gidt.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: gidt.S,v 1.28 2004/03/19 13:48:18 tom Exp $	*/
+/*	$OpenBSD: gidt.S,v 1.29 2005/04/25 23:09:04 tom Exp $	*/
 
 /*
  * Copyright (c) 1997 Michael Shalayeff
@@ -69,8 +69,8 @@
 1:								\
 	.code16;						\
 	movw	$S16DATA, %ax;					\
-	mov	%ax, %ds;					\
-	mov	%ax, %es;					\
+	movw	%ax, %ds;					\
+	movw	%ax, %es;					\
 	gidt_debug1;						\
 								\
 	movl	%cr0, %eax;	/* disable pmmm */		\
@@ -80,19 +80,22 @@
 	/* reload real cs:ip */					\
 	data32 ljmp	$(LINKADDR >> 4), $1f - LINKADDR;	\
 1:								\
-	xor	%ax, %ax;	/* setup: %ds, %es, %ss */	\
-	mov	%ax, %ds;					\
-	mov	%ax, %es;					\
-	mov	%ax, %ss;					\
+	movw	%cs, %ax;	/* setup: %ds, %es, %ss = %cs */ \
+	movw	%ax, %ds;					\
+	movw	%ax, %es;					\
+	xorw	%ax, %ax;					\
+	movw	%ax, %ss;					\
 								\
 	gidt_debug2;						\
 								\
-	data32 addr32 lidt Idtr_real;	/* load idtr for real mode */
+	data32 addr32 lidt (Idtr_real - LINKADDR); /* load idtr for real mode */
 
 #define real2prot						\
 	gidt_debug3;						\
 								\
-	data32 addr32 lgdt Gdtr;	/* load the gdtr */	\
+	movw	$LINKADDR >> 4, %ax;				\
+	movw	%ax, %ds;					\
+	data32 addr32 lgdt (Gdtr - LINKADDR); 	/* load the gdtr */	\
 								\
 	movl	%cr0, %eax;	/* enable pmmm */		\
 	orl	$CR0_PE, %eax;					\
@@ -237,14 +240,14 @@ gdt:
 	.word	(LINKADDR & 0xffff)	# lobase
 	.byte	(LINKADDR >> 16) & 0xff	# midbase
 	.byte	SDT_MEMERAC | 0 | 0x80	# RXAC, dpl = 0, present
-	.byte	0xf | 0 | 0 | 0		# hilimit, xx, 16bit, byte granularity
+	.byte	0x0 | 0 | 0 | 0		# hilimit, xx, 16bit, byte granularity
 	.byte	(LINKADDR >> 20) & 0xff	# hibase
 		/* 0x20 : 16 bit data */
 	.word	0xFFFF			# lolimit
 	.word	(LINKADDR & 0xffff)	# lobase
 	.byte	(LINKADDR >> 16) & 0xff	# midbase
 	.byte	SDT_MEMRWA | 0 | 0x80	# RWA, dpl = 0, present
-	.byte	0xf | 0 | 0 | 0		# hilimit, xx, 16bit, byte granularity
+	.byte	0x0 | 0 | 0 | 0		# hilimit, xx, 16bit, byte granularity
 	.byte	(LINKADDR >> 20) & 0xff	# hibase
 
 .globl Gdtr
@@ -335,10 +338,10 @@ EMUh:
 
 	push	%ds
 
-	addr32  mov _C_LABEL(BIOS_regs)+(BIOSR_ES), %eax
-	mov	%ax, %es
-	addr32  mov _C_LABEL(BIOS_regs)+(BIOSR_DS), %eax
-	mov	%ax, %ds
+	addr32  movw (_C_LABEL(BIOS_regs)+(BIOSR_ES) - LINKADDR), %ax
+	movw	%ax, %es
+	addr32  movw (_C_LABEL(BIOS_regs)+(BIOSR_DS) - LINKADDR), %ax
+	movw	%ax, %ds
 
 	# data32 movl $Leax, %eax
 	.byte	0x66, 0xb8
@@ -351,14 +354,14 @@ intno	= . - 1
 
 	pop	%ds
 
-	addr32 mov %ebx, _C_LABEL(BIOS_regs)+(BIOSR_BX)
-	mov	%es, %bx
-	addr32 mov %ebx, _C_LABEL(BIOS_regs)+(BIOSR_ES)
+	addr32 movw %bx, (_C_LABEL(BIOS_regs)+(BIOSR_BX) - LINKADDR)
+	movw	%es, %bx
+	addr32 movw %bx, (_C_LABEL(BIOS_regs)+(BIOSR_ES) - LINKADDR)
 	movb	%ah, %bh
 	lahf
 	xchgb	%ah, %bh
 
-	addr32 mov %eax, 2f
+	addr32 movl %eax, (2f - LINKADDR)
 
 	real2prot
 
@@ -367,9 +370,9 @@ intno	= . - 1
 2:	.long 0x90909090
 
 	/* pass BIOS return values back to caller */
-	mov	%eax, 0xb*4(%esp)
-	mov	%ecx, 0xa*4(%esp)
-	mov	%edx, 0x9*4(%esp)
+	movl	%eax, 0xb*4(%esp)
+	movl	%ecx, 0xa*4(%esp)
+	movl	%edx, 0x9*4(%esp)
 	movb	%bh , 0xe*4(%esp)
 
 	/* clear NT flag in eflags */
@@ -381,12 +384,12 @@ intno	= . - 1
 	popf
 
 	/* save registers into save area */
-	mov	%eax, _C_LABEL(BIOS_regs)+BIOSR_AX
-	mov	%ecx, _C_LABEL(BIOS_regs)+BIOSR_CX
-	mov	%edx, _C_LABEL(BIOS_regs)+BIOSR_DX
-	mov	%ebp, _C_LABEL(BIOS_regs)+BIOSR_BP
-	mov	%esi, _C_LABEL(BIOS_regs)+BIOSR_SI
-	mov	%edi, _C_LABEL(BIOS_regs)+BIOSR_DI
+	movl	%eax, _C_LABEL(BIOS_regs)+BIOSR_AX
+	movl	%ecx, _C_LABEL(BIOS_regs)+BIOSR_CX
+	movl	%edx, _C_LABEL(BIOS_regs)+BIOSR_DX
+	movl	%ebp, _C_LABEL(BIOS_regs)+BIOSR_BP
+	movl	%esi, _C_LABEL(BIOS_regs)+BIOSR_SI
+	movl	%edi, _C_LABEL(BIOS_regs)+BIOSR_DI
 
 	pop	%gs
 	pop	%fs
diff --git a/sys/arch/i386/stand/libsa/pxe_call.S b/sys/arch/i386/stand/libsa/pxe_call.S
index c9fb4ff1450..b7be49e59fa 100644
--- a/sys/arch/i386/stand/libsa/pxe_call.S
+++ b/sys/arch/i386/stand/libsa/pxe_call.S
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pxe_call.S,v 1.2 2005/03/12 21:52:02 tom Exp $ */
+/*	$OpenBSD: pxe_call.S,v 1.3 2005/04/25 23:09:04 tom Exp $ */
 /*	$NetBSD: pxe_call.S,v 1.2 2002/03/27 17:24:22 kanaoka Exp $	*/
 
 /*
@@ -142,11 +142,13 @@ p2r16:
 	data32 ljmp	$(LINKADDR >> 4), $p2r16real - LINKADDR
 p2r16real:
 	xorw	%ax, %ax		/* Reset segment registers: */
-	movw	%ax, %ds		/* %ds: so we can get at Idtr_real */
 	movw	%ax, %ss		/* %ss: for our stack */
 
+	movw	$LINKADDR >> 4, %ax	/* We're linked to LINKADDR/16:0000 */
+	movw	%ax, %ds		/* %ds: so we can get at Idtr_real */
+
 	.extern	Idtr_real
-	data32 addr32 lidt Idtr_real;	/* Set up IDT for real mode */
+	data32 addr32 lidt (Idtr_real - LINKADDR);	/* Set up IDT for real mode */
 
 	movw	%cs, %ax
 	movw	%ax, %ds
@@ -174,7 +176,7 @@ real_to_prot:
 
 	movw	$LINKADDR >> 4, %ax	/* We're linked to LINKADDR/16:0000 */
 	movw	%ax, %ds
-	addr32 lgdt (Gdtr - LINKADDR)	/* Reload the GDT */
+	data32 addr32 lgdt (Gdtr - LINKADDR)	/* Reload the GDT */
 
 	movl	%cr0, %eax		/* Enable protected mode */
 	orl	$CR0_PE, %eax
diff --git a/sys/arch/i386/stand/pxeboot/conf.c b/sys/arch/i386/stand/pxeboot/conf.c
index ebde7d92e27..fe51d014c5b 100644
--- a/sys/arch/i386/stand/pxeboot/conf.c
+++ b/sys/arch/i386/stand/pxeboot/conf.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: conf.c,v 1.3 2005/03/13 22:07:23 tom Exp $	*/
+/*	$OpenBSD: conf.c,v 1.4 2005/04/25 23:09:04 tom Exp $	*/
 
 /*
  * Copyright (c) 2004 Tom Cosgrove
@@ -46,7 +46,7 @@
 #include "pxeboot.h"
 #include "pxe_net.h"
 
-const char version[] = "1.02";
+const char version[] = "1.03";
 int	debug = 1;
 
 #undef _TEST