diff options
Diffstat (limited to 'sys/boot/pc98/boot2/start.S')
| -rw-r--r-- | sys/boot/pc98/boot2/start.S | 475 |
1 files changed, 0 insertions, 475 deletions
diff --git a/sys/boot/pc98/boot2/start.S b/sys/boot/pc98/boot2/start.S deleted file mode 100644 index 2a9bcbb..0000000 --- a/sys/boot/pc98/boot2/start.S +++ /dev/null @@ -1,475 +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 - * $FreeBSD$ - */ - -/* - 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 */ - -NAMEBLOCKMAGIC= 0xfadefeed /* value of magicnumebr for block2 */ - -/* - * This DEBUGMSG(msg) macro may be useful for debugging. Its use is - * restricted to this file since it only works in real mode. - */ -#define DEBUGMSG(msg) \ - data32 ; \ - mov $msg, %esi ; \ - data32 ; \ - call message - - .code16 - .text - .globl start - -start: - jmp main -boot_cyl: - .word 0 - String "IPL1 " - -main: - /* set up %ds */ - xor %ax, %ax - mov %ax, %ds - - /* set up %ss and %esp */ - mov $BOOTSEG, %eax - mov %ax, %ss - /* - * make a little room on the stack for - * us to save the default bootstring we might find.. - * effectively, we push the bootstring. - */ - mov $BOOTSTACK-64, %esp - - /* set up %es, (where we will load boot2 to) */ - mov %ax, %es - - push %es - push %ecx - push %dx - - mov $0xa000, %eax - mov %ax, %es - - /* set up graphic screen */ - movb $0x42, %ah - movb $0xc0, %ch - int $0x18 - movb $0x40, %ah - int $0x18 - - mov $0x0a00, %eax /* 80 x 25 mode */ - - int $0x18 - movb $0x0c, %ah /* text on */ - int $0x18 - - /* cursor home and on */ - xor %dx, %dx - movb $0x13, %ah - int $0x18 - movb $0x11, %ah - int $0x18 - - /* keyboad reset */ - movb $0x03, %ah - int $0x18 - - /* transfer PC-9801 system common area to 0xa1000 */ - mov $0x0000, %esi - mov $0x1000, %edi - mov $0x0630, %ecx - cld - rep - movsb - - /* transfer EPSON machine type to 0xa1200 */ - push %ds - mov $0xfd00, %eax - mov %ax, %ds - mov 0x804, %eax - and $0x00ffffff, %eax - mov %eax, %es: (0x1624) - - pop %ds - pop %dx - pop %ecx - pop %es - - /* bootstrap passes */ - mov %cs, %bx - cmp $0x1fe0, %bx - jz fd - cmp $0x1fc0, %bx - jnz hd - xor %cx, %cx - movb 0x584, %al - andb $0xf0, %al - cmpb $0x30, %al - jz fd - cmpb $0x90, %al - jnz hd -fd: - mov $0x0200, %cx - mov $0x0001, %dx - movb $0xd6, %ah - jmp load -hd: - and %cx, %cx - jnz 1f - .code32 - addr32 - mov %cs: (boot_cyl), %ecx /* actualy %cx in real mode */ - .code16 -1: - xor %dx, %dx - 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: -#ifdef NAMEBLOCK -/* - * Load the second sector and see if it is a boot instruction block. - * If it is then scan the contents for the first valid string and copy it to - * the location of the default boot string.. then zero it out. - * Finally write the block back to disk with the zero'd out entry.. - * I hate writing at this stage but we need this to be persistant. - * If the boot fails, then the next boot will get the next string. - * /etc/rc will regenerate a complete block2 iff the boot succeeds. - * - * Format of block 2 is: - * [NAMEBLOCKMAGIC] <--0xdeafc0de - * [nulls] - * [bootstring]NULL <---e.g. 0:wd(0,a)/kernel.experimental - * [bootstring]NULL <---e.g. 0:wd(0,a)/kernel.old - * .... - * [bootstring]NULL <---e.g. 0:wd(0,f)/kernel - * FF FF FF - */ -where: - /* - * save things we might smash - * (that are not smashed immedatly after us anyway.) - */ - data32 - push %ecx /* preserve 'cyl,sector ' */ - data32 - push %edx -/* - * Load the second sector - * 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 - */ - data32 - movl $0x0201, %eax /function 2 (read) 1 sector */ - xor %ebx, %ebx /* %bx = 0 */ /* buffer address (ES:0) */ - data32 - movl $0x0002, %ecx /* sector 2, cylinder 0 */ - data32 - andl $0x00ff, %edx /* head 0, drive N */ - int $0x13 - data32 - jb read_error - /* - * confirm that it is one for us - */ - data32 - xorl %ebx, %ebx /* magic number at start of buffer */ - data32 - addr32 - movl %es:(%ebx), %eax - data32 - cmpl $NAMEBLOCKMAGIC, %eax - data32 - jne notours /* not ours so return to caller */ - /* - * scan for a bootstring - * Skip the magic number, and scan till we find a non-null, - * or a -1 - */ - incl %ebx /* quicker and smaller */ - incl %ebx - incl %ebx -scan: - incl %ebx - addr32 - movb %es:(%ebx), %al /* load the next byte */ - testb %al, %al /* and if it is null */ - data32 /* keep scanning (past deleted entries) */ - jz scan - incb %al /* now look for -1 */ - data32 - jz notours /* if we reach the 0xFF then we have finished */ - - /* - * save our settings.. we need them twice.. - */ - data32 - push %ebx - /* - * copy it to the default string location - * which is just above the stack for 64 bytes. - */ - data32 - movl $BOOTSTACK-64, %ecx /* 64 bytes at the top of the stack */ -nxtbyte: - addr32 - movb %es:(%ebx), %al /* get the next byte in */ - addr32 - movb %al, %es:(%ecx) /* and transfer it to the name buffer */ - incl %ebx /* get on with the next byte */ - incl %ecx /* get on with the next byte */ - testb %al, %al /* if it was 0 then quit this */ - data32 - jnz nxtbyte /* and looop if more to do */ - - /* - * restore the saved settings and - * zero it out so next time we don't try it again - */ - data32 - pop %ebx /* get back our starting location */ -#ifdef NAMEBLOCK_WRITEBACK -nxtbyte2: - addr32 - movb %es:(%ebx), %al /* get the byte */ - addr32 - movb $0, %es:(%ebx) /* zero it out */ - data32 - incl %ebx /* point to the next byte */ - testb %al, %al /* check if we have finished.. */ - data32 - jne nxtbyte2 -/* - * Write the second sector back - * Load the second sector - * BIOS call "INT 0x13 Function 0x3" to write sectors from memory to disk - * Call with %ah = 0x3 - * %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 - */ - data32 - movl $0x0301, %eax /* write 1 sector */ - xor %ebx, %ebx /* buffer is at offset 0 */ - data32 - movl $0x0002, %ecx /* block 2 */ - data32 - andl $0xff, %edx /* head 0 */ - int $0x13 - data32 - jnb notours - data32 - mov $eread, %esi - jmp err_stop -#endif /* NAMEBLOCK_WRITEBACK */ - /* - * return to the main-line - */ -notours: - data32 - pop %edx - data32 - pop %ecx -#endif - mov $LOADSZ, %ebx - movb 0x584, %al - xor %bp, %bp /* %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". - */ - - .code32 - data32 - ljmp $BOOTSEG, $ EXT(boot2) - .code16 - -/* - * read_error - */ -read_error: - mov $eread, %esi -err_stop: - call message - jmp stop - -/* - * message: write the error message in %ds:%esi to console - */ -message: - - push %eax - push %ebx - push %ds - push %es - mov $0xe000, %dx - mov 0x501, %al - testb $0x08, %al - jnz 1f - mov $0xa000, %dx -1: - mov %dx, %es - mov %cs, %ax - mov %ax, %ds - mov vram, %di - mov $0x00e1, %bx - mov $160, %cx - 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 - movb %bl, %es:0x2000(%di) - stosb - inc %di - jmp move_cursor -lf_code: - add %cx, %di - jmp move_cursor -cr_code: - xor %dx, %dx - mov %di, %ax - div %cx - sub %dx, %di -move_cursor: - mov %di, %dx - movb $0x13, %ah - int $0x18 - jmp nextb -done: - mov %di, vram - pop %es - pop %ds - pop %ebx - pop %eax - ret - -stop: hlt - jmp stop /* halt doesnt actually halt forever */ - -vram: - .word 0 - -/* error messages */ - - -#ifdef DEBUG -one: String "1-\0" -two: String "2-\0" -three: String "3-\0" -four: String "4-\0" -#endif /* DEBUG */ -#ifdef NAMEBLOCK_WRITEBACK -ewrite: String "Write error\r\n\0" -#endif /* NAMEBLOCK_WRITEBACK */ -eread: String "Read error\r\n\0" -enoboot: String "No bootable partition\r\n\0" -endofcode: - - . = EXT(start) + 0x1be - -/* Partition table */ - - .fill 0x30,0x1,0x0 - .byte 0x80, 0x00, 0x01, 0x00 - .byte 0xa5, 0xff, 0xff, 0xff - .byte 0x00, 0x00, 0x00, 0x00 - .byte 0x50, 0xc3, 0x00, 0x00 - -/* the last 2 bytes in the sector 0 contain the signature */ - .value SIGNATURE - -ENTRY(disklabel) - . = EXT(start) + 0x400 |
