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Diffstat (limited to 'sys/i386/boot/biosboot/start.S')
| -rw-r--r-- | sys/i386/boot/biosboot/start.S | 291 |
1 files changed, 0 insertions, 291 deletions
diff --git a/sys/i386/boot/biosboot/start.S b/sys/i386/boot/biosboot/start.S deleted file mode 100644 index 62b93ac..0000000 --- a/sys/i386/boot/biosboot/start.S +++ /dev/null @@ -1,291 +0,0 @@ -/* - * Mach Operating System - * Copyright (c) 1992, 1991 Carnegie Mellon University - * All Rights Reserved. - * - * Permission to use, copy, modify and distribute this software and its - * documentation is hereby granted, provided that both the copyright - * notice and this permission notice appear in all copies of the - * software, derivative works or modified versions, and any portions - * thereof, and that both notices appear in supporting documentation. - * - * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" - * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR - * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. - * - * Carnegie Mellon requests users of this software to return to - * - * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU - * School of Computer Science - * Carnegie Mellon University - * Pittsburgh PA 15213-3890 - * - * any improvements or extensions that they make and grant Carnegie Mellon - * the rights to redistribute these changes. - * - * from: Mach, Revision 2.2 92/04/04 11:36:29 rpd - * $Id$ - */ - -/* - Copyright 1988, 1989, 1990, 1991, 1992 - by Intel Corporation, Santa Clara, California. - - All Rights Reserved - -Permission to use, copy, modify, and distribute this software and -its documentation for any purpose and without fee is hereby -granted, provided that the above copyright notice appears in all -copies and that both the copyright notice and this permission notice -appear in supporting documentation, and that the name of Intel -not be used in advertising or publicity pertaining to distribution -of the software without specific, written prior permission. - -INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE -INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, -IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR -CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM -LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT, -NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION -WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. -*/ -#include "asm.h" - - .file "start.s" - -BOOTSEG = 0x9000 # boot will be loaded here (below 640K) -BOOTSTACK = 0xe000 # boot stack -SIGNATURE = 0xaa55 -LOADSZ = 15 # size of unix boot -PARTSTART = 0x1be # starting address of partition table -NUMPART = 4 # number of partitions in partition table -PARTSZ = 16 # each partition table entry is 16 bytes -BSDPART = 0xA5 # value of boot_ind, means bootable partition -BOOTABLE = 0x80 # value of boot_ind, means bootable partition - - .text - -ENTRY(boot1) - # start (aka boot1) is loaded at 0x0:0x7c00 but we want 0x7c0:0 - # ljmp to the next instruction to adjust %cs - data32 - ljmp $0x7c0, $start - -start: - # set up %ds - mov %cs, %ax - mov %ax, %ds - - # set up %ss and %esp - data32 - mov $BOOTSEG, %eax - mov %ax, %ss - data32 - mov $BOOTSTACK, %esp - - /*** set up %es, (where we will load boot2 to) ***/ - mov %ax, %es - -#ifdef DEBUG - data32 - mov $one, %esi - data32 - call message -#endif - - # bootstrap passes us drive number in %dl - cmpb $0x80, %dl - data32 - jae hd - -fd: -# reset the disk system -#ifdef DEBUG - data32 - mov $two, %esi - data32 - call message -#endif - movb $0x0, %ah - int $0x13 - data32 - mov $0x0001, %ecx # cyl 0, sector 1 - movb $0, %dh # head -#ifdef DEBUG - data32 - mov $three, %esi - data32 - call message -#endif - data32 - jmp load - -hd: /**** load sector 0 into the BOOTSEG ****/ -#ifdef DEBUG - data32 - mov $four, %esi - data32 - call message -#endif - data32 - mov $0x0201, %eax - xor %ebx, %ebx # %bx = 0 - data32 - mov $0x0001, %ecx -#ifdef DEBUG - data32 - mov $five, %esi - data32 - call message -#endif - data32 - andl $0xff, %edx - /*mov $0x0080, %edx*/ - int $0x13 - data32 - jb read_error - - /***# find the first 386BSD partition *****/ - data32 - mov $PARTSTART, %ebx - data32 - mov $NUMPART, %ecx -again: - addr32 - movb %es:4(%ebx), %al - cmpb $BSDPART, %al - data32 - je found - data32 - add $PARTSZ, %ebx - data32 - loop again - data32 - mov $enoboot, %esi - data32 - jmp err_stop - - -/* -# BIOS call "INT 0x13 Function 0x2" to read sectors from disk into memory -# Call with %ah = 0x2 -# %al = number of sectors -# %ch = cylinder -# %cl = sector -# %dh = head -# %dl = drive (0x80 for hard disk, 0x0 for floppy disk) -# %es:%bx = segment:offset of buffer -# Return: -# %al = 0x0 on success; err code on failure -*/ - -found: - addr32 - movb %es:1(%ebx), %dh /* head */ - addr32 - movl %es:2(%ebx), %ecx /*sect, cyl (+ 2 bytes junk in top word) */ - -load: - movb $0x2, %ah /* function 2 */ - movb $LOADSZ, %al /* number of blocks */ - xor %ebx, %ebx /* %bx = 0, put it at 0 in the BOOTSEG */ - int $0x13 - data32 - jb read_error - - # ljmp to the second stage boot loader (boot2). - # After ljmp, %cs is BOOTSEG and boot1 (512 bytes) will be used - # as an internal buffer "intbuf". - -#ifdef DEBUG - data32 - mov $six, %esi - data32 - call message -#endif - data32 - ljmp $BOOTSEG, $ EXT(boot2) - -# -# read_error -# - -read_error: - data32 - mov $eread, %esi -err_stop: - data32 - call message - data32 - jmp stop - -# -# message: write the error message in %ds:%esi to console -# - -message: -/* - # Use BIOS "int 10H Function 0Eh" to write character in teletype mode - # %ah = 0xe %al = character - # %bh = page %bl = foreground color (graphics modes) -*/ - - data32 - push %eax - data32 - push %ebx - data32 - mov $0x0001, %ebx - cld - -nextb: - lodsb # load a byte into %al - cmpb $0x0, %al - data32 - je done - movb $0xe, %ah - int $0x10 # display a byte - data32 - jmp nextb -done: - data32 - pop %ebx - data32 - pop %eax - data32 - ret - -stop: hlt - data32 - jmp stop # halt doesnt actually halt forever - -/* error messages */ - -#ifdef DEBUG -one: String "1\r\n\0" -two: String "2\r\n\0" -three: String "3\r\n\0" -four: String "4\r\n\0" -five: String "5\r\n\0" -six: String "6\r\n\0" -seven: String "7\r\n\0" -#endif DEBUG -eread: String "Read error\r\n\0" -enoboot: String "No bootable partition\r\n\0" -endofcode: -/* throw in a partition in case we are block0 as well */ -/* flag, head, sec, cyl, typ, ehead, esect, ecyl, start, len */ - . = EXT(boot1) + PARTSTART - .byte 0x0,0,0,0,0,0,0,0 - .long 0,0 - .byte 0x0,0,0,0,0,0,0,0 - .long 0,0 - .byte 0x0,0,0,0,0,0,0,0 - .long 0,0 - .byte BOOTABLE,0,1,0,BSDPART,255,255,255 - .long 0,50000 -/* the last 2 bytes in the sector 0 contain the signature */ - . = EXT(boot1) + 0x1fe - .value SIGNATURE -ENTRY(disklabel) - . = EXT(boot1) + 0x400 |
