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/* $NetBSD: fdboot.S,v 1.3 2022/06/26 14:14:46 tsutsui 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
.text
_start: bras main
/*
* Fake gemdos-fs bootsector, to keep TOS away.
*/
.ascii "NetBSD" | oem
.byte 0,0,0 | serial
.word 0 | bps
.byte 0 | spc
.word 0 | res
.byte 0 | fat
.word 0 | ndirs
.word 0 | sec
.byte 0 | media
.word 0 | spf
.word 0 | spt
.word 0 | side
.word 0 | hid
.even
/*
* ROM loader does not save any register!
*/
main: movml %d1-%d7/%a0-%a6,%sp@-
lea %pc@(m_bot),%a3
movl _membot:w,%d3
lea MAXBOT,%a6
cmpl %a6,%d3
bhis exit | membot > MAXBOT
lea %pc@(m_top),%a3
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
/*
* Determine the number of sectors per cylinder.
*/
movq #0,%d3
0: movl %a6,%a3 | buffer
movq #1,%d0 | count
movq #0,%d1 | side
movl %d1,%d2 | track
addw %d0,%d3 | sector
bsr rds0
beqs 0b
subqw #1,%d3
addw %d3,%d3
lea %pc@(secpercyl),%a0
movw %d3,%a0@
/*
* Load secondary boot loader and disklabel.
*/
movq #NSEC,%d5 | # of sectors
movq #1,%d4 | first sector
movl %a6,%a3 | load address
bsr rds1
lea %pc@(m_rds),%a3
bnes 0f | I/O error
/*
* int bootxx(readsector, disklabel, autoboot)
*/
clrl %sp@- | no autoboot
pea %a6@(LBLST-MAXBOT) | disklabel
pea %pc@(rds2) | readsector
jsr %a6@(BXXST-MAXBOT)
lea %pc@(m_sbl),%a3 | NetBSD not booted
lea %sp@(12),%sp
0: movl %sp@,%sp | restore BIOS stack
movl %d0,%d3
exit: bsrs puts | display error
lea %pc@(m_key),%a3
bsrs puts | wait for key
0: movml %sp@+,%d1-%d7/%a0-%a6
movq #0,%d0
rts
/*
* puts (in: a3, d3)
*/
0: cmpw #35,%d0 | '#'
bnes 1f
bsrs puti
bras puts
1: cmpw #64,%d0 | '@'
bnes 2f
movw #2,%sp@-
movw #Bconin,%sp@-
trap #BIOS
addql #4,%sp
bras puts
2: bsrs putc
puts: movq #0,%d0
movb %a3@+,%d0
bnes 0b
rts
puti: swap %d3
bsrs 0f
swap %d3
0: rorw #8,%d3
bsrs 1f
rorw #8,%d3
1: rorb #4,%d3
bsrs 2f
rorb #4,%d3
2: movw %d3,%d0
andw #15,%d0
addw #48,%d0
cmpw #58,%d0
bcss putc
addw #39,%d0
putc: movw %d0,%sp@-
movw #2,%sp@-
movw #Bconout,%sp@-
trap #BIOS
addql #6,%sp
rts
/*
* int readsec (void *buffer, u_int offset, u_int count);
*/
rds2: movml %d2-%d5/%a2-%a3,%sp@-
movl %sp@(28),%a3 | buffer
movl %sp@(32),%d4 | offset
movl %sp@(36),%d5 | count
bsrs rds1
movml %sp@+,%d2-%d5/%a2-%a3
rts
rds1: bsrs 1f
bnes 0f
tstl %d5
bnes rds1
0: rts
1: movq #0,%d0
movw %pc@(secpercyl),%d0
movl %d4,%d3
divuw %d0,%d3
movw %d3,%d2 | track
clrw %d3
swap %d3
lsrw #1,%d0
divuw %d0,%d3
movw %d3,%d1 | side
swap %d3
subw %d3,%d0
addqw #1,%d3 | sector
cmpl %d0,%d5
bccs rds0
movw %d5,%d0
rds0: movw %d0,%sp@- | count
movw %d1,%sp@- | side
movw %d2,%sp@- | track
movw %d3,%sp@- | sector
movw _bootdev:w,%sp@- | device
clrl %sp@- | filler
movl %a3,%sp@- | buffer
addl %d0,%d4
subl %d0,%d5
lsll #8,%d0
addl %d0,%d0
addl %d0,%a3
movw #Floprd,%sp@-
trap #XBIOS
lea %sp@(20),%sp
tstl %d0
rts
secpercyl:
.word 0
m_bot: .asciz "fdboot: membot == 0x#\r\n"
m_top: .asciz "fdboot: memtop == 0x#\r\n"
m_sbl: .asciz "fdboot: bootxx => 0x#\r\n"
m_rds: .asciz "fdboot: Floprd => 0x#\r\n"
m_key: .asciz "\007\r\npress any key... @\r\n"
fill: .space 22 | 510-(fill-start)
.word 0 | checksum
end:
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