-/* $OpenBSD: biosdisk.S,v 1.6 1997/04/18 06:54:43 weingart Exp $ */
+/* $OpenBSD: biosdisk.S,v 1.7 1997/04/18 17:48:23 mickey Exp $ */
/*
- * Ported to boot 386BSD by Julian Elischer (julian@tfs.com) Sept 1992
+ * Copyright (c) 1997 Michael Shalayeff
+ * All rights reserved.
+ *
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by Michael Shalayeff.
+ * 4. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 REGENTS OR CONTRIBUTORS 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.
*
- * 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.
*/
-/*
- 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 <machine/asm.h>
#define _LOCORE
#include "debug_md.h"
#undef _LOCORE
/*
-# 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
-*/
+ * int biosread(dev,cyl,head,sect,nsect,buf)
+ * read number of sectors from disk
+ */
ENTRY(biosread)
pushl %ebp
movl %esp, %ebp
movb $0x2, %ah # subfunction
movb 24(%ebp), %al # number of sectors
movl 28(%ebp), %ebx # offset
- movl %ebx, %edi # spilt off for seg:off pair
+ movl %ebx, %edi # split off for seg:off pair
andl $0xf, %ebx # atomic read for up to 64k
shrl $4, %edi
ret
ENTRY(bioswrite)
-
movl $1, %eax
ret
/*
#
-# biosdinfo(): return a word that represents the
+# u_int16_t biosdinfo(): return a word that represents the
# max number of sectors and heads and drives for this device
#
*/
pushl %ebx
pushl %ecx
- movb 8(%ebp), %dl # diskinfo(drive #)
+ movb 8(%ebp), %dl # drive #
movb $0x08, %ah # ask for disk info
BIOSINT(0x13)
- movb $1, %ah # max head
- movb $18, %al # max sector
+ movb $1, %ah # max head
+ movb $18, %al # max sector
jc 1f
- /* form a longword representing all this gunk */
+ /* form a word w/ nhead/nsect packed */
movb %dh, %ah # max head
andb $0x3f, %cl # mask of cylinder gunk
movb %cl, %al # max sector (and # sectors)
*/
ENTRY(biosdreset)
- pushl %ebp
- movl %esp, %ebp
pushl %ebx
pushl %ecx
- movb $0x00, %ah # ask for disk info
+ movb $0x00, %ah # reset disk system
BIOSINT(0x13)
popl %ecx
popl %ebx
- popl %ebp
ret
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