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Diffstat (limited to 'sys/pc98/boot/biosboot/start.S')
| -rw-r--r-- | sys/pc98/boot/biosboot/start.S | 354 |
1 files changed, 354 insertions, 0 deletions
diff --git a/sys/pc98/boot/biosboot/start.S b/sys/pc98/boot/biosboot/start.S new file mode 100644 index 0000000..ab159d7 --- /dev/null +++ b/sys/pc98/boot/biosboot/start.S @@ -0,0 +1,354 @@ +/* + * 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: start.S,v 1.6 1995/09/16 13:51:20 bde Exp $ + */ + +/* + 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. +*/ +/* + * Ported to PC-9801 by Yoshio Kimura + */ + +#include "asm.h" + + .file "start.S" + +SIGNATURE= 0xaa55 +LOADSZ= 8192 /* size of unix boot */ + + .text + .globl start + +ENTRY(boot1) + jmp start + +boot_cyl: + .word 0 + String "IPL1 " + +start: + /* set up %ds */ + xor %ax, %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 + + push %es + push %cx + push %dx + + data32 + mov $0xa000, %eax + mov %ax, %es + + addr32 + movb 0x501, %al + testb $0x08, %al + jnz hireso +normal: + /* set up graphic screen */ + movb $0x42, %ah + movb $0xc0, %ch + int $0x18 + movb $0x40, %ah + int $0x18 + + data32 + mov $0x0a00, %eax /* 80 x 25 mode */ + jmp 1f +hireso: + movb $0x08, %al /* set up RAM window */ + outb %al, $0x91 + movb $0x0a, %al + outb %al, $0x93 + data32 + mov $0x0a10, %ax /* 80 x 31 mode */ +1: + int $0x18 + movb $0x0c, %ah /* text on */ + int $0x18 + + /* cursor home and on */ + xor %edx, %edx + movb $0x13, %ah + int $0x18 + movb $0x11, %ah + int $0x18 + + /* highreso no supported */ + addr32 + movb 0x501, %al + testb $0x08, %al + jz nothireso + + data32 + mov $ehireso, %esi + data32 + call message + hlt + +nothireso: + /* keyboad reset */ + movb $0x03, %ah + int $0x18 + + /* transfer PC-9801 system common area to 0xa1000 */ + data32 + mov $0x0000, %esi + data32 + mov $0x1000, %edi + data32 + mov $0x0630, %ecx + cld + rep + movsb + + /* transfer EPSON machine type to 0xa1200 */ + push %ds + data32 + mov $0xfd00, %eax + mov %ax, %ds + addr32 + data32 + mov 0x804, %eax + data32 + and $0x00ffffff, %eax + addr32 + data32 + .byte 0x26 + mov %eax, %es: (0x1624) + + pop %ds + pop %dx + pop %cx + pop %es + + /* bootstrap passes */ + mov %cs, %bx + data32 + cmp $0x1fc0, %ebx + jnz hd + data32 + mov %ebp, %ecx + data32 + mov %ebp, %edx + addr32 + movb 0x584, %al + andb $0xf0, %al + cmpb $0x90, %al + jnz hd +fd: + data32 + mov $0x0200, %ecx + data32 + mov $0x0001, %edx + movb $0xd6, %ah + jmp load +hd: + data32 + and %ecx, %ecx + jnz 1f + addr32 + data32 + mov %cs: (boot_cyl), %ecx +1: + movb $0x06, %ah + +/* + * BIOS call "INT 0x1B Function 0xn6" to read sectors from disk into memory + * Call with %ah = 0xd6(for floppy disk) or 0x06(for hard disk) + * %al = DA/UA + * %bx = data length + * %ch = sector size(for floppy) or cylinder(for hard) + * %cl = cylinder + * %dh = head + * %dl = sector + * %es:%bp = segment:offset of buffer + * Return: + * %ah = 0x0 on success; err code on failure + */ + +load: + data32 + mov $LOADSZ, %ebx + addr32 + movb 0x584, %al + xor %ebp, %ebp /* %bp = 0, put it at 0 in the BOOTSEG */ + int $0x1b + jc 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". + */ + + 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: + + data32 + push %eax + data32 + push %ebx + push %ds + push %es + data32 + mov $0xe000, %eax + mov %ax, %es + addr32 + mov 0x501, %al + testb $0x08, %al + jnz 1f + data32 + mov $0xa000, %eax + mov %ax, %es +1: + mov %cs, %ax + mov %ax, %ds + addr32 + data32 + mov vram, %edi + data32 + mov $0x00e1, %ebx + cld + +nextb: + lodsb /* load a byte into %al */ + cmpb $0x0, %al + je done + cmpb $0x0d, %al + je cr_code + cmpb $0x0a, %al + je lf_code + addr32 + movb %al, (%edi) + addr32 + movb %bl, 0x2000(%edi) + data32 + inc %edi + data32 + inc %edi + jmp nextb +cr_code: + data32 + add $80, %edi + jmp nextb +lf_code: + data32 + mov %edi, %eax + data32 + mov $80, %edx + data32 + div %ebx + data32 + sub %ebx, %edi + jmp nextb +done: + addr32 + data32 + mov %edi, vram + pop %es + pop %ds + data32 + pop %ebx + data32 + pop %eax + data32 + ret + +stop: hlt + data32 + jmp stop /* halt doesnt actually halt forever */ + +vram: + .long 0 + +/* 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: +ehireso: String "Highreso not supported\r\n\0" +/* the last 2 bytes in the sector 0 contain the signature */ + . = EXT(boot1) + 0x1fe + .value SIGNATURE +ENTRY(disklabel) + . = EXT(boot1) + 0x400 |
