diff options
Diffstat (limited to 'sys/arch/i386/stand/biosboot/biosboot.S')
| -rw-r--r-- | sys/arch/i386/stand/biosboot/biosboot.S | 30 |
1 files changed, 11 insertions, 19 deletions
diff --git a/sys/arch/i386/stand/biosboot/biosboot.S b/sys/arch/i386/stand/biosboot/biosboot.S index 1341924b1ef..51f3c0ca4a2 100644 --- a/sys/arch/i386/stand/biosboot/biosboot.S +++ b/sys/arch/i386/stand/biosboot/biosboot.S @@ -1,6 +1,7 @@ -/* $OpenBSD: biosboot.S,v 1.34 2003/06/03 20:22:11 mickey Exp $ */ +/* $OpenBSD: biosboot.S,v 1.35 2003/06/27 18:27:53 weingart Exp $ */ /* + * Copyright (c) 2003 Tobias Weingartner * Copyright (c) 1997 Michael Shalayeff, Tobias Weingartner * All rights reserved. * @@ -31,9 +32,9 @@ #include <machine/asm.h> #include <assym.h> -#define BLKCNT 52 +#define BLKCNT 63 -#define BOOTSEG 0x07c0 /* boot loaded here */ +#define BOOTSEG 0x07c0 /* biosboot loaded here */ #define BOOTSTACK 0xfffc /* stack starts here */ #define LFMAGIC 0x464c /* LFMAGIC (only uses two bytes of \7fELF */ @@ -86,25 +87,22 @@ ebpb: .long 16 /* hidden sectors */ 1: /* Fix up %cs just in case */ - data32 ljmp $BOOTSEG, $1f + ljmp $BOOTSEG, $1f load_msg: .asciz "reading boot" 1: - /* set up stack (%ss:%esp) */ + /* set up stack (%ss:%sp) */ cli /* disable interrupts w/o stack */ xor %ax, %ax mov %ax, %ss - movl $BOOTSTACK, %esp + mov $BOOTSTACK, %sp sti /* we have stack, do ints */ - /* Set up other segment regs */ + /* Set up needed data segment reg */ mov $BOOTSEG, %ax mov %ax, %ds - mov %ax, %es - mov %ax, %fs - mov %ax, %gs #ifdef SERIAL # Initialize the serial port to 9600 baud, 8N1. @@ -126,9 +124,9 @@ load_msg: mov $(LOADADDR >> 4), %ax mov %ax, %es - xorl %ebx, %ebx /* put it at %es:0 */ + xorw %bx, %bx /* put it at %es:0 */ movb block_count, %cl /* how many to read */ - movzbl %cl, %ecx + movzbw %cl, %cx movw $block_table, %si 1: @@ -153,7 +151,7 @@ load_msg: 3: /* read next block */ pop %ax - movzbl %al, %eax + movzbw %al, %ax shl $9, %ax /* 512 bytes sectors */ add %ax, %bx pop %cx @@ -187,17 +185,11 @@ halt: putc('P') #endif -#ifdef BDEBUG - movl $0xb8004, %ebx - movl $0x074f0747, (%ebx) -#endif - movzbl %dl, %eax /* drive number is in the lowest byte */ pushl %eax pushl $BOOTMAGIC /* use some magic */ /* jmp /boot */ - /* data32 */ ljmp $(LINKADDR >> 4), $0 /* not reached */ |