190 lines
3.5 KiB
ArmAsm
190 lines
3.5 KiB
ArmAsm
| $NetBSD: sdboot.s,v 1.2 1998/01/05 20:52:20 perry Exp $
|
||
|
|
||
| file: boot.s
|
||
| author: chapuni(GBA02750@niftyserve.or.jp)
|
||
|.offset $100000
|
||
|_header:: ds.l 8
|
||
|_image::
|
||
|
||
.global _header
|
||
.global _image
|
||
|
||
_header=0x100000 | まずは、このアドレスに
|
||
_image=_header+(8*4) | コアをロードします。
|
||
|
||
.global _bootufs
|
||
.text
|
||
top:
|
||
jra entry:S
|
||
.ascii "SHARP/"
|
||
.ascii "X68030"
|
||
.word 0x8199,0x94e6,0x82ea,0x82bd
|
||
.word 0x8e9e,0x82c9,0x82cd,0x8cbb
|
||
.word 0x8ec0,0x93a6,0x94f0,0x8149
|
||
| 2400(もしくは$3F0000)
|
||
| d4 にはすでに SCSI ID が入っている
|
||
| ここから jmp まではリロケータブルに書かねばならない。
|
||
entry:
|
||
lea _edata:l,a0 | clear out BSS
|
||
movl #_end-4,d0 | (must be <= 256 kB)
|
||
subl #_edata,d0
|
||
lsrl #2,d0
|
||
1: clrl a0@+
|
||
dbra d0,1b
|
||
|
||
lea top:l,a1 | 0x3F0000 にスタックポインタを
|
||
lea a1@,sp | 設定する。だから :l が付いてないとダメ
|
||
moveq #1,d5 | 512bytes/sec
|
||
moveq #8192/512,d3 | 読み込める最大サイズ
|
||
moveq #0x40,d2 | いわゆる決め打ち(sd*a のみ)
|
||
moveq #0x21,d1 | read
|
||
moveq #0xFFFFFFF5,d0 | SCSI
|
||
trap #15
|
||
movel d4,_ID:l
|
||
|
||
| テキストパレットの初期化
|
||
moveq #7,d3
|
||
moveq #0,d1
|
||
initpalet:
|
||
moveq #0,d2
|
||
moveq #0x14,d0 |TPALET2
|
||
trap #15
|
||
addqw #1,d1
|
||
movel #0xFFFF,d2
|
||
moveq #0x14,d0 |TPALET2
|
||
trap #15
|
||
addqw #1,d1
|
||
dbra d3,initpalet
|
||
|
||
jmp _bootufs:l | 0x3Fxxxx に飛んでゆく
|
||
|
||
| int RAW_READ(void *buf, int pos, size_t length);
|
||
| .offset 16
|
||
|raw_read_buf: ds.l 1
|
||
|raw_read_pos: ds.l 1
|
||
|raw_read_len: ds.l 1
|
||
| .text
|
||
raw_read_buf= 4+(4*11)
|
||
raw_read_pos= raw_read_buf+4
|
||
raw_read_len= raw_read_buf+8
|
||
|
||
.global _RAW_READ
|
||
_RAW_READ:
|
||
moveml a2-a6/d2-d7,sp@-
|
||
movel _ID:l,d4
|
||
moveq #1,d5 | 512bytes/sec
|
||
movel sp@(raw_read_buf),a1
|
||
movel sp@(raw_read_pos),d2
|
||
movel sp@(raw_read_len),d3
|
||
addl #511,d3
|
||
moveq #9,d1
|
||
lsrl d1,d2
|
||
lsrl d1,d3
|
||
addl #0x40,d2
|
||
moveq #0x21,d1
|
||
moveq #0xF5-0x100,d0
|
||
trap #15
|
||
moveml sp@+,a2-a6/d2-d7
|
||
rts
|
||
|
||
.global _JISSFT
|
||
_JISSFT:
|
||
movel sp@(4),d1
|
||
moveq #0xFFFFFFA1,d0
|
||
trap #15
|
||
rts
|
||
|
||
.global _B_SFTSNS
|
||
_B_SFTSNS:
|
||
moveq #0x02,d0
|
||
trap #15
|
||
rts
|
||
|
||
.global _B_KEYINP
|
||
_B_KEYINP:
|
||
moveq #0x00,d0
|
||
trap #15
|
||
rts
|
||
|
||
.global _B_PUTC
|
||
_B_PUTC:
|
||
movel sp@(4),d1
|
||
moveq #0x20,d0
|
||
trap #15
|
||
rts
|
||
|
||
.global _B_PRINT
|
||
_B_PRINT:
|
||
movel sp@(4),a1
|
||
moveq #0x21,d0
|
||
trap #15
|
||
rts
|
||
|
||
.global _B_COLOR
|
||
_B_COLOR:
|
||
movel sp@(4),d1
|
||
moveq #0x22,d0
|
||
trap #15
|
||
rts
|
||
|
||
.global _B_LOCATE
|
||
_B_LOCATE:
|
||
movel d2,sp@-
|
||
movel sp@(8),d1
|
||
movel sp@(12),d2
|
||
moveq #0x23,d0
|
||
trap #15
|
||
movel sp@+,d2
|
||
rts
|
||
|
||
.global _B_CLR_ST
|
||
_B_CLR_ST:
|
||
movel sp@(4),d1
|
||
moveq #0x2A,d0
|
||
trap #15
|
||
rts
|
||
|
||
|IOCS SYS_STAT $AC
|
||
|
|
||
|入力 d1.l=0 のとき d0.l に以下の値
|
||
| bit0~7 0:68000, 1:68010, 2:68020, 3:68030
|
||
| bit14 0:MMUなし, 1:MMUあり
|
||
| bit15 0:FPCPなし, 1:FPCPあり
|
||
| bit16~31 クロックスピード
|
||
|
|
||
| X68000 の IOCS には $AC はないのでエラーになりますが、Xellent30 の場合は
|
||
|起動時に SRAM で組み込んでくれます。
|
||
.global _SYS_STAT
|
||
_SYS_STAT:
|
||
movel sp@(4),d1
|
||
moveq #0xAC-0x100,d0
|
||
trap #15
|
||
rts
|
||
|
||
.global _getcpu
|
||
_getcpu:
|
||
movl #0x200,d0 | data freeze bit
|
||
movc d0,cacr | only exists on 68030
|
||
movc cacr,d0 | read it back
|
||
tstl d0 | zero?
|
||
jeq Lnot68030 | yes, we have 68020/68040
|
||
movq #3,d0 | 68030
|
||
rts
|
||
Lnot68030:
|
||
bset #31,d0 | data cache enable bit
|
||
movc d0,cacr | only exists on 68040
|
||
movc cacr,d0 | read it back
|
||
tstl d0 | zero?
|
||
beq Lis68020 | yes, we have 68020
|
||
moveq #0,d0 | now turn it back off
|
||
movec d0,cacr | before we access any data
|
||
movq #4,d0 | 68040
|
||
rts
|
||
Lis68020:
|
||
movq #2,d0 | 68020
|
||
rts
|
||
|
||
.comm _ID,4
|
||
|
||
.end
|