c2f9d95de5
'three-stage' bootstrap. There are a number of caveats with the code in its current state: - The i386 bootstrap only supports booting from a floppy. - The kernel and kld do not yet know how to deal with the extended information and module summary passed in. - PnP-based autodetection and demand loading of modules is not implemented. - i386 ELF kernel loading is not ready yet. - The i386 bootstrap is loaded via an ugly blockmap. On the alpha, both net- and disk-booting (SRM console machines only) is supported. No blockmaps are used by this code. Obtained from: Parts from the NetBSD/i386 standalone bootstrap.
115 lines
3.2 KiB
ArmAsm
115 lines
3.2 KiB
ArmAsm
/*
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* Mach Operating System
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* Copyright (c) 1992, 1991 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie Mellon
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* the rights to redistribute these changes.
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*
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* from: Mach, Revision 2.2 92/04/04 11:34:26 rpd
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* $Id: bios.S,v 1.12 1997/07/31 08:07:53 phk Exp $
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*/
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/*
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Copyright 1988, 1989, 1990, 1991, 1992
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by Intel Corporation, Santa Clara, California.
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All Rights Reserved
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Permission to use, copy, modify, and distribute this software and
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its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appears in all
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copies and that both the copyright notice and this permission notice
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appear in supporting documentation, and that the name of Intel
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not be used in advertising or publicity pertaining to distribution
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of the software without specific, written prior permission.
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INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
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INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
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IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
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CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
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NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <machine/asm.h>
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#define addr32 .byte 0x67
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#define data32 .byte 0x66
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/*
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*
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* get_diskinfo(): return a word that represents the
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* max number of sectors and heads and drives for this device
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*
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*/
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ENTRY(bd_int13fn8)
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push %ebp
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mov %esp, %ebp
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push %ebx
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push %esi
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push %edi
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movb 0x8(%ebp), %dl /* diskinfo(drive #) */
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call CNAME(prot_to_real) /* enter real mode */
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movb $0x8, %ah /* ask for disk info */
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sti
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int $0x13
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cli
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jnc ok
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/* call failed, return 0 */
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subb %cl, %cl
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subb %ch, %ch
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subb %dl, %dl
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subb %dh, %dh
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ok:
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data32
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call CNAME(real_to_prot) /* back to protected mode */
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/*
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* form a longword representing all this gunk:
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* 6 bit zero
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* 10 bit max cylinder (0 based)
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* 8 bit max head (0 based)
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* 2 bit zero
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* 6 bit max sector (1 based) = # sectors
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*/
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movb %cl, %al /* Upper two bits of cylinder count */
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andl $0xc0,%eax
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leal 0(,%eax,4),%eax /* << 2 */
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movb %ch, %al /* Lower 8 bits */
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sall $16,%eax /* << 16 */
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movb %dh, %ah /* max head */
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andb $0x3f, %cl /* mask of cylinder gunk */
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movb %cl, %al /* max sector (and # sectors) */
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pop %edi
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pop %esi
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pop %ebx
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pop %ebp
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ret
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