208 lines
4.4 KiB
ArmAsm
208 lines
4.4 KiB
ArmAsm
/* $NetBSD: wdboot.s,v 1.4 1996/12/28 23:38:09 leo Exp $ */
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/*
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* Copyright (c) 1995 Waldi Ravens
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Waldi Ravens.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "xxboot.h"
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.globl start, main, fill, end
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.text
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/*
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* in: d3 ('DMAr' flag), d4 (SCSI target), d5 (boot pref), d7 (ACSI target)
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*/
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start:
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main: lea pc@(regsav),a0
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movml d3-d5/d7,sp@-
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movl sp,a0@
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movw #-1,sp@-
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movw #Kbshift,sp@-
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trap #BIOS
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addql #4,sp
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tstb d5
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beqs 0f | no boot preference
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cmpb #0x20,d5
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bnes exit | bootpref != NetBSD
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0: btst #3,d0 | Alternate?
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bnes exit
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subql #1,d0
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movl d0,a3 | autoboot flag
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movl _membot:w,d3
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lea MAXBOT,a4
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cmpl a4,d3
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bhis exit | membot > MAXBOT
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movl _memtop:w,d3
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cmpl #MINTOP,d3
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blts exit | memtop < MINTOP
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andw #-4,d3
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movl d3,a0
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movl sp,a0@-
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movl a0,sp | set new stack
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movq #NSEC,d5 | sector count
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movq #1,d6 | first sector
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bsrs rds0
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tstl d0
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bnes 0f
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/*
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* loader (readsector, disklabel, autoboot)
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*/
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pea a3@ | autoboot
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pea a4@(LBLST-MAXBOT) | disklabel
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pea pc@(rds1) | readsector
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jsr a4@(BXXST-MAXBOT)
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lea sp@(12),sp | NetBSD not booted
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0: movl sp@,sp | restore BIOS stack
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tstl d0
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bmis exit
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movl d0,sp@(8) | new boot preference
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exit: movml sp@+,d3-d5/d7
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rts
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/*
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* int readsec (void *buffer, u_int offset, u_int count);
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*/
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rds1: movml d2-d7/a2-a6,sp@-
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movl pc@(regsav),a0
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movml a0@,d3-d5/d7
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movl sp@(48),a4 | buffer
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movl sp@(52),d6 | offset
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movl sp@(56),d3 | count
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0: movl #255,d5
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cmpl d5,d3
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bccs 1f
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movl d3,d5
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1: bsrs rds0
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tstl d0
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bnes 2f
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addl #(255*512),a4
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addl d5,d6
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subl d5,d3
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bnes 0b
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2: movml sp@+,d2-d7/a2-a6
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rts
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/*
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* in: d4 (target) d5 (count), d6 (offset), a4 (buffer)
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* out: d0 (<= 0)
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* mod: d0, d1, d2, a0, a1, a5, a6
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*/
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rds0: lea pc@(dpar),a6
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tstb a6@
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bnes 0f
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movb d4,d0
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andb #1,d0
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aslb #4,d0
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orb #0xa0,d0
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movb d0,idesdh:l
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movl a4,a0
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movq #0,d1
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movb #0,idedor:l
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movb #0xec,idecr:l | IDENTIFY DRIVE
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bsrs wait
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bnes err
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movb a4@(7),a6@ | tracks/cylinder
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movb a4@(13),a6@(1) | sectors/track
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0: movl d6,d1
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movq #0,d0
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movb a6@(1),d0
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movq #0,d2
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movb a6@,d2
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mulu d0,d2
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divu d2,d1
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movb d1,idecl:l
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lsrl #8,d1
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movb d1,idech:l
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lsrl #8,d1
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divu d0,d1
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movb d4,d0
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andb #1,d0
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aslb #4,d0
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orb d0,d1
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orb #0xa0,d1
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movb d1,idesdh:l
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swap d1
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addqw #1,d1
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movb d1,idesn:l
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movl a4,a0
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movb d5,idesc:l
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movw d5,d1
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subqw #1,d1
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movb #0,idedor:l
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movb #0x20,idecr:l
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wait: movl #0x7d0,d0
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addl _hz_200:w,d0
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2: btst #5,gpip:w
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beqs 3f
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cmpl _hz_200:w,d0
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bhis 2b
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err: movq #-1,d0
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rts
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3: movb idesr:l,d0
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btst #0,d0
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bnes err
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btst #3,d0
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beqs err
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movq #63,d0
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lea idedr:l,a1
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4: movw a1@,a0@+
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movw a1@,a0@+
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movw a1@,a0@+
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movw a1@,a0@+
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dbra d0,4b
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dbra d1,wait
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movq #0,d0
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rts
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regsav: .long 0
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fill: .space 30
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dpar: .byte 0 | tracks/cylinder
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.byte 0 | sectors/track
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.ascii "NetBSD"
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hd_siz: .long 0
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p0_dsc: .long 0, 0, 0
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p1_dsc: .long 0, 0, 0
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p2_dsc: .long 0, 0, 0
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p3_dsc: .long 0, 0, 0
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bsl_st: .long 0
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bsl_sz: .long 0
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.word 0
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end:
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