191 lines
4.1 KiB
ArmAsm
191 lines
4.1 KiB
ArmAsm
/* $NetBSD: sdb00t.ahdi.s,v 1.2 1996/12/28 23:38:00 leo 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"
|
|
|
|
.globl start, main, fill, end
|
|
|
|
.text
|
|
|
|
start: bras main
|
|
bra rds0
|
|
|
|
main: bclr #2,(_drvbits+3):w
|
|
clrl pun_ptr:w
|
|
movml d3/d5,sp@-
|
|
movw #-1,sp@-
|
|
movw #Kbshift,sp@-
|
|
trap #BIOS
|
|
addql #4,sp
|
|
btst #3,d0 | Alternate?
|
|
bnes exit
|
|
movq #3,d0
|
|
lea pc@(p0_dsc),a0
|
|
cmpl #0x444d4172,d3 | SCSI bootdev?
|
|
beqs 0f
|
|
movq #-1,d4 | no, ACSI
|
|
movq #0,d5
|
|
0: movb d5,d1 | NVRAM bootpref
|
|
bnes 1f
|
|
|
|
| The Hades bios does not provide a bootprev. In case
|
|
| of doubt, we fetch it ourselves.
|
|
movb #BOOTPREF,rtcrnr:w
|
|
movb rtcdat:w,d1
|
|
bnes 1f
|
|
movq #-8,d1 | bootpref = any
|
|
|
|
1: movb a0@,d2 | bootflags
|
|
btst #0,d2
|
|
beqs 2f
|
|
andb d1,d2
|
|
bnes boot
|
|
2: lea a0@(12),a0
|
|
dbra d0,1b
|
|
|
|
exit: movml sp@+,d3/d5
|
|
tostst: clrw _bootdev:w
|
|
movl _sysbase:w,a0
|
|
movl a0@(24),d0
|
|
swap d0
|
|
cmpl #0x19870422,d0 | old TOS?
|
|
bccs 0f | no
|
|
movw #0xe0,d7
|
|
0: rts
|
|
|
|
boot: movl a0@(4),d6
|
|
movq #1,d5
|
|
lea pc@(end),a4
|
|
bsrs rds0
|
|
tstw d0
|
|
bnes exit
|
|
movl a4,a0
|
|
movw #0xff,d0
|
|
movq #0,d1
|
|
0: addw a0@+,d1
|
|
dbra d0,0b
|
|
cmpw #0x1234,d1
|
|
bnes exit
|
|
lea pc@(rds0),a3
|
|
lea pc@(tostst),a5
|
|
movml sp@+,d3/d5
|
|
jmp a4@ | start bootsector code
|
|
/*
|
|
* in: d4/d7 (target) d5 (count), d6 (offset), a4 (buffer)
|
|
* out: d0 (<= 0)
|
|
* mod: d0, d1, d2, a0, a1, a5, a6
|
|
*/
|
|
rds0: tstl d4
|
|
bmis 0f
|
|
movw d4,sp@- | device
|
|
pea a4@ | buffer
|
|
movw d5,sp@- | count
|
|
movl d6,sp@- | offset
|
|
movw #DMAread,sp@-
|
|
trap #XBIOS
|
|
lea sp@(14),sp
|
|
rts
|
|
|
|
0: st flock:w
|
|
movl _hz_200:w,d0
|
|
addql #2,d0
|
|
1: cmpl _hz_200:w,d0
|
|
bccs 1b
|
|
movml d6/a4,sp@-
|
|
lea dmahi:w,a6
|
|
movb sp@(7),a6@(4)
|
|
movb sp@(6),a6@(2)
|
|
movb sp@(5),a6@
|
|
lea pc@(r0com),a6
|
|
movb sp@(1),a6@(1)
|
|
movb sp@(2),a6@(5)
|
|
movb sp@(3),a6@(9)
|
|
movb d5,a6@(13)
|
|
addql #8,sp
|
|
lea dmodus:w,a6
|
|
lea daccess:w,a5
|
|
movw #0x198,a6@
|
|
movw #0x098,a6@
|
|
movw d5,a5@
|
|
movw #0x88,a6@
|
|
movq #0,d0
|
|
movb d7,d0
|
|
orb #0x08,d0
|
|
swap d0
|
|
movw #0x8a,d0
|
|
bsrs shake
|
|
lea pc@(r0com),a0
|
|
movq #3,d2
|
|
2: movl a0@+,d0
|
|
bsrs shake
|
|
dbra d2,2b
|
|
movq #0x0a,d0
|
|
movl d0,a5@
|
|
movl #0x190,d1
|
|
bsrs wait
|
|
movw #0x8a,a6@
|
|
movw a5@,d0
|
|
andw #0xff,d0
|
|
beqs 0f
|
|
r0err: movq #-1,d0
|
|
0: movw #0x80,a6@
|
|
clrb flock:w
|
|
r0ret: rts
|
|
|
|
shake: movl d0,a5@
|
|
movq #0x0a,d1
|
|
wait: addl _hz_200:w,d1
|
|
0: btst #5,gpip:w
|
|
beqs r0ret
|
|
cmpl _hz_200:w,d1
|
|
bccs 0b
|
|
addql #4,sp
|
|
bras r0err
|
|
|
|
r0com: .long 0x0000008a
|
|
.long 0x0000008a
|
|
.long 0x0000008a
|
|
.long 0x0001008a
|
|
|
|
fill: .space 46
|
|
|
|
.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:
|