diff options
| author | Tobias Weingartner <weingart@cvs.openbsd.org> | 2003-06-27 18:27:54 +0000 |
|---|---|---|
| committer | Tobias Weingartner <weingart@cvs.openbsd.org> | 2003-06-27 18:27:54 +0000 |
| commit | e6d0bf1dab3affbfbe1aa40245bf175d4cae5feb (patch) | |
| tree | defe740391abe77d3cf12a0dbf9c956abc2b69a8 /sys/arch/i386/stand/biosboot | |
| parent | 06769317e53bf674f5024110eba647703c25721c (diff) | |
Cleanup biosboot to remove uneeded 32-bit opcodes, initializations of
32-bit segment registers, and other things not really necessary. Cleanup
some comments while there as well. Tweak blocktable to max size these
changes allow us. This should help in shrinking the code some, making
future changes easier.
nate@ ok.
Diffstat (limited to 'sys/arch/i386/stand/biosboot')
| -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 */ |