215 lines
4.6 KiB
ArmAsm
215 lines
4.6 KiB
ArmAsm
/* $NetBSD: wdboot.S,v 1.2 2005/12/11 12:17:02 christos Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1995 Waldi Ravens
|
|
* 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 Waldi Ravens.
|
|
* 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 AUTHOR 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.
|
|
*/
|
|
|
|
#include "xxboot.h"
|
|
|
|
#ifdef __ELF__
|
|
.globl _start, main, fill
|
|
|
|
.text
|
|
_start:
|
|
#else
|
|
.globl start, main, fill
|
|
|
|
.text
|
|
start:
|
|
#endif
|
|
/*
|
|
* in: d3 ('DMAr' flag), d4 (SCSI target), d5 (boot pref), d7 (ACSI target)
|
|
*/
|
|
main: lea %pc@(regsav),%a0
|
|
movml %d3-%d5/%d7,%sp@-
|
|
movl %sp,%a0@
|
|
|
|
movw #-1,%sp@-
|
|
movw #Kbshift,%sp@-
|
|
trap #BIOS
|
|
addql #4,%sp
|
|
|
|
tstb %d5
|
|
beqs 0f | no boot preference
|
|
cmpb #0x20,%d5
|
|
bnes exit | bootpref != NetBSD
|
|
|
|
0: btst #3,%d0 | Alternate?
|
|
bnes exit
|
|
subql #1,%d0
|
|
movl %d0,%a3 | autoboot flag
|
|
|
|
movl _membot:w,%d3
|
|
lea MAXBOT,%a4
|
|
cmpl %a4,%d3
|
|
bhis exit | membot > MAXBOT
|
|
|
|
movl _memtop:w,%d3
|
|
cmpl #MINTOP,%d3
|
|
blts exit | memtop < MINTOP
|
|
|
|
andw #-4,%d3
|
|
movl %d3,%a0
|
|
movl %sp,%a0@-
|
|
movl %a0,%sp | set new stack
|
|
|
|
movq #NSEC,%d5 | sector count
|
|
movq #1,%d6 | first sector
|
|
bsrs rds0
|
|
tstl %d0
|
|
bnes 0f
|
|
/*
|
|
* loader (readsector, disklabel, autoboot)
|
|
*/
|
|
pea %a3@ | autoboot
|
|
pea %a4@(LBLST-MAXBOT) | disklabel
|
|
pea %pc@(rds1) | readsector
|
|
jsr %a4@(BXXST-MAXBOT)
|
|
lea %sp@(12),%sp | NetBSD not booted
|
|
|
|
0: movl %sp@,%sp | restore BIOS stack
|
|
tstl %d0
|
|
bmis exit
|
|
movl %d0,%sp@(8) | new boot preference
|
|
|
|
exit: movml %sp@+,%d3-%d5/%d7
|
|
rts
|
|
|
|
/*
|
|
* int readsec (void *buffer, u_int offset, u_int count);
|
|
*/
|
|
rds1: movml %d2-%d7/%a2-%a6,%sp@-
|
|
movl %pc@(regsav),%a0
|
|
movml %a0@,%d3-%d5/%d7
|
|
movl %sp@(48),%a4 | buffer
|
|
movl %sp@(52),%d6 | offset
|
|
movl %sp@(56),%d3 | count
|
|
0: movl #255,%d5
|
|
cmpl %d5,%d3
|
|
bccs 1f
|
|
movl %d3,%d5
|
|
1: bsrs rds0
|
|
tstl %d0
|
|
bnes 2f
|
|
addl #(255*512),%a4
|
|
addl %d5,%d6
|
|
subl %d5,%d3
|
|
bnes 0b
|
|
2: movml %sp@+,%d2-%d7/%a2-%a6
|
|
rts
|
|
/*
|
|
* in: d4 (target) d5 (count), d6 (offset), a4 (buffer)
|
|
* out: d0 (<= 0)
|
|
* mod: d0, d1, d2, a0, a1, a5, a6
|
|
*/
|
|
rds0: lea %pc@(dpar),%a6
|
|
tstb %a6@
|
|
bnes 0f
|
|
movb %d4,%d0
|
|
andb #1,%d0
|
|
aslb #4,%d0
|
|
orb #0xa0,%d0
|
|
movb %d0,idesdh:l
|
|
movl %a4,%a0
|
|
movq #0,%d1
|
|
movb #0,idedor:l
|
|
movb #0xec,idecr:l | IDENTIFY DRIVE
|
|
bsrs wait
|
|
bnes err
|
|
movb %a4@(7),%a6@ | tracks/cylinder
|
|
movb %a4@(13),%a6@(1) | sectors/track
|
|
0: movl %d6,%d1
|
|
movq #0,%d0
|
|
movb %a6@(1),%d0
|
|
movq #0,%d2
|
|
movb %a6@,%d2
|
|
mulu %d0,%d2
|
|
divu %d2,%d1
|
|
movb %d1,idecl:l
|
|
lsrl #8,%d1
|
|
movb %d1,idech:l
|
|
lsrl #8,%d1
|
|
divu %d0,%d1
|
|
movb %d4,%d0
|
|
andb #1,%d0
|
|
aslb #4,%d0
|
|
orb %d0,%d1
|
|
orb #0xa0,%d1
|
|
movb %d1,idesdh:l
|
|
swap %d1
|
|
addqw #1,%d1
|
|
movb %d1,idesn:l
|
|
movl %a4,%a0
|
|
movb %d5,idesc:l
|
|
movw %d5,%d1
|
|
subqw #1,%d1
|
|
movb #0,idedor:l
|
|
movb #0x20,idecr:l
|
|
wait: movl #0x7d0,%d0
|
|
addl _hz_200:w,%d0
|
|
2: btst #5,gpip:w
|
|
beqs 3f
|
|
cmpl _hz_200:w,%d0
|
|
bhis 2b
|
|
err: movq #-1,%d0
|
|
rts
|
|
3: movb idesr:l,%d0
|
|
btst #0,%d0
|
|
bnes err
|
|
btst #3,%d0
|
|
beqs err
|
|
movq #63,%d0
|
|
lea idedr:l,%a1
|
|
4: movw %a1@,%a0@+
|
|
movw %a1@,%a0@+
|
|
movw %a1@,%a0@+
|
|
movw %a1@,%a0@+
|
|
dbra %d0,4b
|
|
dbra %d1,wait
|
|
movq #0,%d0
|
|
rts
|
|
|
|
regsav: .long 0
|
|
|
|
fill: .space 30
|
|
|
|
dpar: .byte 0 | tracks/cylinder
|
|
.byte 0 | sectors/track
|
|
|
|
.ascii "NetBSD"
|
|
hd_siz: .long 0
|
|
p0_dsc: .long 0, 0, 0
|
|
p1_dsc: .long 0, 0, 0
|
|
p2_dsc: .long 0, 0, 0
|
|
p3_dsc: .long 0, 0, 0
|
|
bsl_st: .long 0
|
|
bsl_sz: .long 0
|
|
.word 0
|
|
end:
|