diff options
Diffstat (limited to 'sys/i386/boot/biosboot/bios.S')
| -rw-r--r-- | sys/i386/boot/biosboot/bios.S | 478 |
1 files changed, 0 insertions, 478 deletions
diff --git a/sys/i386/boot/biosboot/bios.S b/sys/i386/boot/biosboot/bios.S deleted file mode 100644 index 30fc76432427..000000000000 --- a/sys/i386/boot/biosboot/bios.S +++ /dev/null @@ -1,478 +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 11:34:26 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. -*/ - -/* - * Extensions for El Torito CD-ROM booting: - * - * Copyright © 1997 Pluto Technologies International, Inc. Boulder CO - * Copyright © 1997 interface business GmbH, Dresden. - * All rights reserved. - * - * This code has been written by Jörg Wunsch, Dresden. - * Direct comments to <joerg_wunsch@interface-business.de>. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR - * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED - * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE - * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, - * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES - * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR - * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, - * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING - * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - * - */ - - .file "bios.s" - -#include "asm.h" - .text - -#ifndef CDBOOT - -/* - * biosread(dev, cyl, head, sec, nsec, offset) - * Read "nsec" sectors from disk to offset "offset" in boot segment - * 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 - */ - -ENTRY(biosread) - push %ebp - mov %esp, %ebp - - push %ebx - push %esi - push %edi - - movb 0x10(%ebp), %dh - movw 0x0c(%ebp), %cx - /* cylinder; the highest 2 bits of cyl is in %cl */ - xchgb %ch, %cl - rorb $2, %cl - movb 0x14(%ebp), %al - orb %al, %cl - incb %cl /* sector; sec starts from 1, not 0 */ - movb 0x8(%ebp), %dl /* device */ - movl 0x1c(%ebp), %ebx /* offset */ - - /* prot_to_real will set %es to BOOTSEG */ - call EXT(prot_to_real) /* enter real mode */ - movb $0x2, %ah /* subfunction */ - addr32 - movb 0x18(%ebp), %al /* number of sectors */ - - sti - int $0x13 - cli - - /* save return value (actually movw %ax, %bx) */ - mov %eax, %ebx - - data32 - call EXT(real_to_prot) /* back to protected mode */ - - xor %eax, %eax - movb %bh, %al /* return value in %ax */ - - pop %edi - pop %esi - pop %ebx - pop %ebp - - ret - -#else /* CDBOOT */ - - -/* - * int - * getbootspec(struct specpacket *offset) - * - * Read CD-ROM boot specification packet to "offset". - */ -ENTRY(getbootspec) - push %ebp - mov %esp, %ebp - - push %esi - push %ebx - - movw 0x8(%ebp), %si - mov $0x7f, %edx - - /* prot_to_real will set %es to BOOTSEG */ - call EXT(prot_to_real) /* enter real mode */ - movw $0x4b01, %ax /* (do not) terminate disk emulation */ - movb $0x7f, %dl /* any drive */ - - sti - int $0x13 - cli - - /* save return value (actually movw %ax, %bx) */ - mov %eax, %ebx - - data32 - call EXT(real_to_prot) /* back to protected mode */ - - xor %eax, %eax - movb %bh, %al /* return value in %ax */ - - pop %ebx - pop %esi - pop %ebp - - ret - - -/* - * int - * biosreadlba(struct daddrpacket *daddr) - * Read sectors using the BIOS "read extended" function - * BIOS call "INT 0x13 Function 0x42" to read sectors from disk into memory - * Call with %ah = 0x42 - * %dl = drive (0x0 for floppy disk, or emulated CD) - * %ds:%si = ptr to disk address packet - * Return: - * %ah = 0x0 on success; err code on failure - */ - -ENTRY(biosreadlba) - push %ebp - mov %esp, %ebp - - push %ebx - push %esi - - movw 8(%ebp), %si - movl $0, %edx /* emulated CD is always drive 0 */ - - /* prot_to_real will set %es to BOOTSEG */ - call EXT(prot_to_real) /* enter real mode */ - movw $0x4200, %ax /* subfunction */ - movb $0, %dl - - sti - int $0x13 - cli - - /* save return value (actually movw %ax, %bx) */ - mov %eax, %ebx - - data32 - call EXT(real_to_prot) /* back to protected mode */ - - xor %eax, %eax - movb %bh, %al /* return value in %ax */ - - pop %esi - pop %ebx - pop %ebp - - ret - -#endif /* !CDBOOT */ - -/* - * putc(ch) - * BIOS call "INT 10H Function 0Eh" to write character to console - * Call with %ah = 0x0e - * %al = character - * %bh = page - * %bl = foreground color ( graphics modes) - */ - - -ENTRY(putc) - push %ebp - mov %esp, %ebp - push %ebx - push %esi - push %edi - - movb 0x8(%ebp), %cl - - call EXT(prot_to_real) - - data32 - mov $0x1, %ebx /* %bh=0, %bl=1 (blue) */ - movb $0xe, %ah - movb %cl, %al - sti - int $0x10 /* display a byte */ - cli - - data32 - call EXT(real_to_prot) - - pop %edi - pop %esi - pop %ebx - pop %ebp - ret - - -/* - * getc() - * BIOS call "INT 16H Function 00H" to read character from keyboard - * Call with %ah = 0x0 - * Return: %ah = keyboard scan code - * %al = ASCII character - */ - -ENTRY(getc) - push %ebp - mov %esp, %ebp - push %ebx /* save %ebx */ - push %esi - push %edi - - call EXT(prot_to_real) - - movb $0x0, %ah - sti - int $0x16 - cli - - movb %al, %bl /* real_to_prot uses %eax */ - - data32 - call EXT(real_to_prot) - - xor %eax, %eax - movb %bl, %al - - pop %edi - pop %esi - pop %ebx - pop %ebp - ret -/* - * ischar() - * if there is a character pending, return it; otherwise return 0 - * BIOS call "INT 16H Function 01H" to check whether a character is pending - * Call with %ah = 0x1 - * Return: - * If key waiting to be input: - * %ah = keyboard scan code - * %al = ASCII character - * Zero flag = clear - * else - * Zero flag = set - */ -ENTRY(ischar) - push %ebp - mov %esp, %ebp - push %ebx - push %esi - push %edi - - call EXT(prot_to_real) /* enter real mode */ - - xor %ebx, %ebx - movb $0x1, %ah - sti - int $0x16 - cli - data32 - jz nochar - movb %al, %bl - -nochar: - data32 - call EXT(real_to_prot) - - xor %eax, %eax - movb %bl, %al - - pop %edi - pop %esi - pop %ebx - pop %ebp - ret - -/* - * - * get_diskinfo(): return a word that represents the - * max number of sectors and heads and drives for this device - * - */ - -ENTRY(get_diskinfo) - push %ebp - mov %esp, %ebp - push %ebx - push %esi - push %edi - - movb 0x8(%ebp), %dl /* diskinfo(drive #) */ - call EXT(prot_to_real) /* enter real mode */ - - movb $0x8, %ah /* ask for disk info */ - - sti - int $0x13 - cli - - jnc ok - /* - * Urk. Call failed. It is not supported for floppies by old BIOS's. - * Guess it's a 15-sector floppy. - */ - subb %ah, %ah /* %ax = 0 */ - movb %al, %al - movb %ah, %bh /* %bh = 0 */ - movb $2, %bl /* %bl bits 0-3 = drive type, - bit 2 = 1.2M */ - movb $79, %ch /* max track */ - movb $15, %cl /* max sector */ - movb $1, %dh /* max head */ - movb $1, %dl /* # floppy drives installed */ - /* es:di = parameter table */ - /* carry = 0 */ -ok: - - data32 - call EXT(real_to_prot) /* back to protected mode */ - - /* - * form a longword representing all this gunk: - * 6 bit zero - * 10 bit max cylinder (0 based) - * 8 bit max head (0 based) - * 2 bit zero - * 6 bit max sector (1 based) = # sectors - */ - movb %cl, %al /* Upper two bits of cylinder count */ - andl $192,%eax - leal 0(,%eax,4),%eax /* << 2 */ - movb %ch, %al /* Lower 8 bits */ - sall $16,%eax /* << 16 */ - movb %dh, %ah /* max head */ - andb $0x3f, %cl /* mask of cylinder gunk */ - movb %cl, %al /* max sector (and # sectors) */ - - pop %edi - pop %esi - pop %ebx - pop %ebp - ret - -/* - * - * memsize(i) : return the memory size in KB. i == 0 for conventional memory, - * i == 1 for extended memory - * BIOS call "INT 12H" to get conventional memory size - * BIOS call "INT 15H, AH=88H" to get extended memory size - * Both have the return value in AX. - * - */ - -ENTRY(memsize) - push %ebp - mov %esp, %ebp - push %ebx - push %esi - push %edi - - mov 8(%ebp), %ebx - - call EXT(prot_to_real) /* enter real mode */ - - cmpb $0x1, %bl - data32 - je xext - - sti - int $0x12 - cli - data32 - jmp xdone - -xext: movb $0x88, %ah - sti - int $0x15 - cli - -xdone: - pushl $0 /* actually pushw $0 */ - pushl %eax /* actually pushw %ax */ - - data32 - call EXT(real_to_prot) - - pop %eax - pop %edi - pop %esi - pop %ebx - pop %ebp - ret |