A2osX/LIB/LIBBLKDEV.S.BB.txt

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NEW
AUTO 3,1
*--------------------------------------
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dcmd .EQ $42 disk command (=1 for read)
unit .EQ $43 (16*slot)+(128*(drive-1))
buff .EQ $44 ram address
blok .EQ $46 disk address
dent .EQ $48 device call entry address
idxl .EQ $4a pointer to low page of index block
idxh .EQ $4c pointer to high page of index block
idxp .EQ $4e index byte pointer
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iobuff .EQ $60
* the following are for disk ii only
dbuf .EQ $26
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BB.Slotn0 .EQ $2b
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oddbits .EQ $3c
sector .EQ $3d
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BB.RetryCnt .EQ $40
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BB.TargetTrk .EQ $41
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BB.CurrentQTrack .EQ $50
BB.TargetQTrack .EQ $51
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BB.HdrPtr .EQ $52
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BB.Hdr .EQ $54
BB.HdrTrk .EQ $55
BB.HdrVol .EQ $56
BB.Hdr96 .EQ $57
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nbuf1 .EQ $300
dnib .EQ $2d6
clrscrn .EQ $fc58
scrn .EQ $5b6
sosid .EQ $c00
entlen .EQ sosid+$23
kernel .EQ $2000
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*--------------------------------------
.PH $800
xboot .DA #1
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sec apple iii enters xboot 'ora $38'
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* bcs BB.AppleII branch if not apple iii native mode
bcc *
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*--------------------------------------
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*BB.AppleIII lda #$9f make apple iii boot using block 1
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* pha the return address is $a000
* lda #$ff
* pha
* inc
* tax ldx #0
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* inc lda #1 (read block 1)
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* jmp $f479
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*--------------------------------------
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BB.AppleII stx unit save unit number
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cmp #$03 for disk ii
php save result, it may be irrelevant
txa find out if disk ii
and #$70 strip drive # if any
lsr
lsr get slot address
lsr
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lsr
ora #$c0
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sta dent+1
ldy #$ff look at last byte
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sty dent
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plp restore carry (if disk ii & sect 0&2 read)
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iny make y=0
lda (dent),y get device entry addr
bne ndsk2 branch if not disk ii (16 sector)
bcs isdsk2 branch if it is disk ii, but block 0 read
lda #3 make rom read only sector 2
sta xboot to complete block 0
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inc sector was = 1
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lda dent+1 do rts to re-enter rom
pha
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lda #$5b
pha
rts go read sector 2 into $900
*--------------------------------------
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isdsk2 sta BB.HdrTrk A=0, make sure previous track =0
sta dent and dent points at beginning of slot
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ldy #$63 move code from card to ram
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mvboot lda (dent),y
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sta zzstart-$5e,y
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iny
cpy #$eb have we moved enough?
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bne mvboot
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ldx #mods.cnt now modify code to handle errors.
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modboot ldy mods-1,x
lda chgs-1,x
sta zzstart,y
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cpx #8
bcs .1
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lda endcode-1,x
sta zzzend-1,x
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.1 dex
bne modboot
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lda #BB.Hdr
sta BB.HdrPtr
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stx BB.HdrPtr+1 X=0
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lda /BB.ReadBlock reset device entry
sta dent+1 to point at disk ii routines.
lda #BB.ReadBlock get low addr (must be <$80)
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*--------------------------------------
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ndsk2 sta dent save low adr of device call entry.
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ldy #0
sty iobuff y=0
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sty idxl
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sty idxh
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sty idxp
sty blok+1
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iny y=1
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sty dcmd set read command.
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iny y=2
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sty blok to read directory blocks
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lda #$c 2-5 at $c00
sta iobuff+1
sta idxl+1
rddir jsr goread call read block routine.
bcs bterr2 give up on error.
inc iobuff+1
inc iobuff+1
inc blok
lda blok have all directory blocks been read?
cmp #6
bcc rddir loop if not.
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*--------------------------------------
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lda #4 begin look-up with first entry past header.
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.HS 2C BIT ABS
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nxdent lda idxl
nxdent1 clc
adc entlen bump to next directory entry.
tay save in y for now.
bcc nxdent2 branch if not a page cross.
inc idxl+1
lda idxl+1 check for new block.
lsr if even then new block.
bcs nxdent2
cmp #$a have all file names been compared?
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beq booterr branch if no pro.kernel.
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ldy #4 else, begin at block beginning.
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nxdent2 sty idxl
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ldy #6
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lookpro lda (idxl),y look for matching name.
cmp BB.ProDOS,y
bne nxdent branch if no match.
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dey
bpl lookpro
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* ldy #$10 get file type & index block addr.
* lda (idxl),y
* cmp #S.FI.T.SYS is it a system file?
* bne booterr
* iny
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ldy #$11
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lda (idxl),y
sta blok
iny
lda (idxl),y
sta blok+1
lda #0 now set up to read kernel.
sta idxl
ldy #$1e read index block at $1e00 and
sty idxl+1 kernel at $2000
sty iobuff+1
iny
sty idxh+1
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*--------------------------------------
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rdkernl jsr goread read index block.
bterr2 bcs booterr
inc iobuff+1
inc iobuff+1
ldy idxp get index pointer
inc idxp bump for next time.
lda (idxl),y
sta blok
lda (idxh),y high disk addr.
sta blok+1
ora (idxl),y if both=0 then done.
bne rdkernl branch if more to read.
jmp kernel go execute kernel code.
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*--------------------------------------
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booterr jsr clrscrn clear video
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ldy #BB.MSG.ERR.Len-1
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.1 lda BB.MSG.ERR,y
sta scrn,y
dey
bpl .1
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jmp $ff69
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*--------------------------------------
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goread lda iobuff
sta buff
lda iobuff+1
sta buff+1
jmp (dent)
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*--------------------------------------
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mods .DA #mod1,#mod2,#mod3,#mod4,#mod5,#mod6,#mod7,#mod8,#mod8+1,#mod9
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mods.cnt .EQ *-mods
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chgs .DA #chg1,#chg2,#chg3,#chg4,#chg5,#chg6,#chg7,#$91,#BB.HdrPtr,#BB.HdrTrk
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endcode ldx BB.Slotn0
clc
rts
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jmp BB.Seek
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*--------------------------------------
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BB.MSG.ERR .AS -"BOOT ERROR"
BB.MSG.ERR.Len .EQ *-BB.MSG.ERR
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BB.ProDOS .DA #$26 $20 = storage type + 6 = "PRODOS" len
.AS "PRODOS"
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*--------------------------------------
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BB.ReadBlock lda blok figure out track & sector.
and #7 strip track for now.
cmp #4
and #3
php
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asl
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plp
rol now we have the first sector of block.
sta sector
lda blok+1 get high block #
lsr shift hi addr to carry.
lda blok now figure track #
ror
lsr
lsr
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sta BB.TargetTrk
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*--------------------------------------
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lda buff+1
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sta dbuf+1
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ldx BB.Slotn0
lda IO.D2.DrvOn,x
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jsr BB.Seek go read sector.
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inc dbuf+1 bump address
inc sector
inc sector and sector #
bcs .9 branch if error.
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jsr BB.Seek
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.9 ldy IO.D2.DrvOff,x
rts return error status in carry.
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*--------------------------------------
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BB.Wait100usecA phx (3)
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.1 ldx #20 (2)
.2 dex (2)
bne .2 (3)
dec (2)
bne .1 (3)
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plx (4)
rts (6)
*--------------------------------------
BB.Trk2Qtrk asl x2
sta .1+1
bit BB.HdrVol
bpl .1 x4
bvs .1 > $C0 ? (VOL=254)
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lsr x3
.1 adc #$ff SELF MODIFIED
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BB.Trk2Qtrk.RTS rts
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*--------------------------------------
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BB.Seek lda BB.HdrTrk get track we're on
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jsr BB.Trk2Qtrk
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sta BB.CurrentQTrack
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lda BB.TargetTrk
jsr BB.Trk2Qtrk
sta BB.TargetQTrack
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lda BB.CurrentQTrack
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cmp BB.TargetQTrack
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beq BB.Read
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bit #1
bne .1
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jsr .20 we are on 0/4 or 2/4 track
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lda #1
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bra .9 no wait, next operation will be phy/plx/Ph0On,y
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.1 cmp BB.TargetQTrack we are on 1/4 or 3/4
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bcs .2 if CS, C > T, must move out
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inc CC: C < T, ON next PH
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.HS B0 BCS
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.2 dec CS: C > T, ON prev PH
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sta BB.CurrentQTrack
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bra .6 Ph ON to go to 0/4 or 2/4, then wait
*--------------------------------------
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.20 and #6
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ora BB.Slotn0
tay
lda IO.D2.Ph0On,y
rts
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*--------------------------------------
.3 bcs .4 if CS, C > T, must move out
inc CC: C < T, ON next PH
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.HS B0 BCS
.4 dec CS: C > T, ON prev PH
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sta BB.CurrentQTrack
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bit #1
bne .5 we must go to 1/4 or 3/4
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lda IO.D2.Ph0Off,x we must go to 0/4 or 2/4 : Off Prev Ph
bra .8 go wait....
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.5 phy we must go on 1/4 or 3/4
plx Y already ON, -> X for Ph0Off,x
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bcs .6 if CS, C > T, must move out
inc CC: C < T, ON next PH
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.6 jsr .20 now X and Y on
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.8 lda #IO.D2.SeekTimeB
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.9 jsr BB.Wait100usecA ...wait...
lda BB.CurrentQTrack
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cmp BB.TargetQTrack
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bne .3
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lsr CS if X,Y on
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lda #0
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jsr BB.Wait100usecA
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lda IO.D2.Ph0Off,y
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bcc .90
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lda IO.D2.Ph0Off,x
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.90
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*--------------------------------------
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BB.Read ldx BB.Slotn0
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stz BB.RetryCnt
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php
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tryread plp fix stack.
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rdhead sec anticipate error.
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inc BB.RetryCnt if = 0 then give up!
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beq BB.Trk2Qtrk.RTS branch if can't fine/read sector.
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clc indicate reading header.
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ldy #0 Retry cnt waiting D5
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rddata php carry set if reading sector.
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rd0 iny
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beq tryread
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*--------------------------------------
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* from zzstart to zzend code is moved from rom and modified to match this code...
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*--------------------------------------
zzstart .EQ *
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rd1 lda IO.D2.RData,x read a byte from the state machine.
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bpl rd1 loop until ready.
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.DUMMY
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rd1a eor #$d5 mark 1?
mod1 .EQ *-zzstart+1
bne rd0 branch if not.
chg1 .EQ rd0-*
rd2 lda IO.D2.RData,x
bpl rd2
cmp #$aa mark 2?
bne rd1a
nop waste a little time.
rd3 lda IO.D2.RData,x
bpl rd3
cmp #$96 header mark 3?
beq rdhd1 branch if it is.
plp were we looking for data mark 3?
mod2 .EQ *-zzstart+1
bcc rdhead branch if not.
chg2 .EQ rdhead-*
eor #$ad data mark 3?
beq rddt1 go read data field if true...
mod3 .EQ *-zzstart+1
rdhd0 bne rdhead otherwise, start over.
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chg3 .EQ rdhead-*
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rdhd1 ldy #3 read in trk,sect,&volume #.
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mod8 .EQ *-zzstart
rdhd2 sta (BB.HdrPtr),y save last result in .. , BB.HdrTrk , BB.HdrVol , ..
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rdhd3 lda IO.D2.RData,x
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bpl rdhd3
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rol
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sta oddbits save odd bits (7,5,3,1)
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rdhd4 lda IO.D2.RData,x
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bpl rdhd4
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and oddbits combine even and odd to form value.
dey
bne rdhd2 read in next pair.
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plp
cmp sector last byte formed is sector#
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mod4 .EQ *-zzstart+1
bne rdhead branch if target sector not found.
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chg4 .EQ rdhead-*
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mod9 .EQ *-zzstart+1
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lda BB.HdrTrk previous result is track #
cmp BB.TargetTrk is desired track found?
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mod5 .EQ *-zzstart+1
bne goseek re-seek if mismatch.
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chg5a .EQ *
mod6 .EQ *-zzstart+1
bcs rddata branch if proper track always.
chg6 .EQ rddata-*
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*--------------------------------------
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rddt1 ldy #$56 read 2 bit groupings first.
rddt1a sty oddbits
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rddt2 ldy IO.D2.RData,x
bpl rddt2
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eor dnib,y denibblize using table left from boot rom.
ldy oddbits save in nbuf1
dey
sta nbuf1,y
bne rddt1a loop until all 86 groups are read.
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rddt3 sty oddbits now count up for 6-bit groups.
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rddt4 ldy IO.D2.RData,x
bpl rddt4
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eor dnib,y
ldy oddbits save result to specified buffer.
sta (dbuf),y
iny
bne rddt3 loop for 256 bytes.
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rdchk ldy IO.D2.RData,x now verify checksum...
bpl rdchk
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eor dnib,y must be equal...
mod7 .EQ *-zzstart+1
bne rdhd0 branch if error.
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chg7 .EQ rdhd0-*
ldy #0 make y=0
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nxttwo ldx #$56 now combine 2-bit group with 6 bit group
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twobit dex all done with this group?
bmi nxttwo branch if so.
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lda (dbuf),y
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lsr nbuf1,x
rol
lsr nbuf1,x
rol
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sta (dbuf),y
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iny
bne twobit
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*--------------------------------------
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zzzend ldx BB.Slotn0
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clc indicate good read.
rts
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chg5 .EQ *-chg5a
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goseek jmp BB.Seek
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.ED
*--------------------------------------
.LIST ON
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BB.End .EQ *
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BB.Free .EQ $a00-*
.BS BB.Free
.LIST OFF
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.EP
*--------------------------------------
MAN
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SAVE usr/src/lib/libblkdev.s.bb
LOAD usr/src/lib/libblkdev.s
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ASM