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A2osX/ProDOS.FX/ProDOS.S.XDOS.D.txt
Rémy GIBERT 88a56a14a3 Kernel 0.94
2020-07-17 17:18:31 +02:00

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NEW
AUTO 3,1
*--------------------------------------
XDOS.Read jsr mvdbufr xfer buffer address and request count
jsr mvcbytes to a more accessable location, also
pha get fcb attributes and save on stack.
jsr calcmrk calc mark after read, test if mark > eof
pla carry set means end mark > eof.
and #$01 test for read enabled.
beq .9
bcc L4205 branch if result mark < eof. adjust
ldy fcbptr request to read until just before eof.
lda FCBs+FCB.EOF,y result = (eof-1) - position
sbc tposll
sta cbytes
sta rwreql
lda FCBs+FCB.EOF+1,y
sbc tposlh
sta cbytes+1
sta rwreqh
ora cbytes if both bytes = 0 then eof error
bne L4210
lda #MLI.E.EOF
.HS 2C
.9 lda #MLI.E.LOCKED
L4202 jmp errfix1
L4205 lda cbytes
ora cbytes+1
bne L4210 if read request definitely non-zero.
L420D jmp rwdone do nothing.
L4210 jsr valdbuf validate user's data buffer range.
bcs L4202 branch if memory conflict.
jsr gfcbstyp get storage type
cmp #$04 and find out if it's a tree or other.
bcc L421F branch if a tree file
jmp dread otherwise assume it's a directory.
L421F jsr rdposn set up data pointer.
bcs L4202 errors.
jsr preprw test for newline, setup for partial
jsr readpart read. move current data buffer contents
bvs L420D to user area. branch if satisfied.
bcs L421F indicates newline is set.
lda rwreqh how many blocks are to be read ?
lsr if < 2 then use the slow way.
beq L421F
sta cmdtemp save bulk block count.
jsr gfcbstat make sure current data area doesn't
and #$40 need writing before resetting ptr to
bne L421F read into user's area. branch if data
sta ioaccess needs to be written to force 1st call
lda usrbuf thru all dev handler checking. make
sta datptr the data buffer the user's space.
lda usrbuf+1
sta datptr+1
L4249 jsr rdposn get next block directly into user space.
bcs L42B7 if error.
L424E inc datptr+1 incll ptrs by one block (512 bytes)
inc datptr+1
dec rwreqh
dec rwreqh
inc tposlh
inc tposlh
bne L4269 if pos'n doesn't get to a 64k boundary
inc tposhi otherwise, must check for a 128k one.
lda tposhi carry set if 128k boundary reached.
eor #$01
lsr
L4269 dec cmdtemp has all been read fast ?
bne L427B branch if more to read.
jsr fxdatptr go fix up data pointer to xdos buffer.
lda rwreql test for end of read.
ora rwreqh are both 0 ?
beq rwdone yes, done.
bne L421F no, read last partial block
L427B bcs L4249
lda tposhi get index to next block address
lsr
lda tposlh
ror
tay index to address = int(pos/512)
lda (zpt),y get low address
sta bloknml
inc zpt+1
cmp (zpt),y are hi and low address the same?
bne L4299 no, it's a real block address.
cmp #$00 are both bytes 0 ?
bne L4299 no, must be real data.
sta ioaccess don't do repeat io just after sparse.
beq L429C branch always (carry set).
L4299 lda (zpt),y get high address
clc
L429C dec zpt+1
bcs L4249 if no block to read.
sta bloknml+1
lda ioaccess has 1st call gone to device yet ?
beq L4249 no, go thru normal route
php interrupts can't occur during dmgr call
sei
lda datptr+1 reset hi buffer address for dev handler
sta buf+1
jsr dmgr
bcs L42B6 if error
plp
bra L424E no errors, branch always.
L42B6 plp restore interrupts.
L42B7 pha save error code.
jsr fxdatptr go restore data pointers, etc.
pla
errfix1 pha save error code
jsr rwdone pass back # of bytes actually read
pla
sec error
rts
rwdone ldy #$06 return total # of bytes actually read
sec derived from cbytes-rwreq.
lda cbytes
sbc rwreql
sta (A3L),y
iny
lda cbytes+1
sbc rwreqh
sta (A3L),y
jmp rdposn leave with valid position in fcb.
preprw ldy fcbptr adj pointer to user's buffer to make
sec the transfer
lda usrbuf
sbc tposll
sta usrbuf
bcs L42E9 if no adjustment to hi address needed
dec usrbuf+1
L42E9 lda FCBs+FCB.NLMASK,y test for new line enabled.
clc
beq L42F9 if new line not enabled.
sec carry indicates new line enabled
sta nlmask
lda FCBs+FCB.NLBYTE,y move newline character to more
sta nlchar accesible spot.
L42F9 ldy tposll index to 1st data.
lda datptr reset low order of position pointer to
sta sos beginning of page.
ldx rwreql get low order count of requested bytes.
rts return statuses.
readpart txa x = low count of bytes to move.
bne L430F branch if request is not an even page.
lda rwreqh a call of 0 bytes should never get here!
beq L435D branch if nothing to do.
dec rwreqh
L430F dex
L4310 lda (sos),y move data to user's buffer
sta (usrbuf),y
bcs tstnewl test for newline 1st !
L4316 txa note: x must be unchanged from tstnewl !
beq L4332 go see if read request is satified...
L4319 dex dec # of bytes left to move.
iny page crossed ?
bne L4310 no, move next byte.
lda sos+1 test for end of buffer, but first
inc usrbuf+1 adjust user buffer pointer
inc tposlh and position
bne L4329
inc tposhi
L4329 inc sos+1 and sos buffer high address.
eor datptr+1 (carry is undisturbed)
beq L4310 branch if more to read in buffer.
clv indicate not finished.
bvc L4360 always.
L4332 lda rwreqh
beq L4350 branch if request is satisfied.
iny done with this block of data ?
bne L4340 no, adjust high byte of request.
lda sos+1 maybe, check for end of block buffer.
eor datptr+1 (don't disturb carry).
bne L4343 if hi count can be dealt with next time
L4340 dec rwreqh
L4343 dey restore proper value
bra L4319
tstnewl lda (sos),y get last byte transferred again.
and nlmask only bits on in mask are significant.
eor nlchar does it match newline character?
bne L4316 no, read next.
L4350 iny adjust position.
bne L435D
inc usrbuf+1 inc pointers
inc tposlh
bne L435D
inc tposhi
L435D bit setvflg (sets v flag)
L4360 sty tposll save low position
bvs L4366
inx leave request as +1 for next call
L4366 stx rwreql and remainder of request count.
php save statuses
clc adjust user's low buffer address
tya
adc usrbuf
sta usrbuf
bcc L4374
inc usrbuf+1 adjust hi address as needed.
L4374 plp restore return statuses.
setvflg rts this byte ($60) is used to set v flag.
fxdatptr lda datptr put current user buffer address back to normal
sta usrbuf
lda datptr+1
sta usrbuf+1 bank pair byte should be moved also.
ldy fcbptr restore buffer address
jmp fndfcbuf
* read directory file
dread jsr rdposn
bcs L43B8 pass back any errors.
jsr preprw prepare for transfer.
jsr readpart move data to user's buffer.
bvc dread repeat until request is satisfied.
jsr rwdone update fcb as to new position.
bcc L43B6 branch if done with no errors.
cmp #MLI.E.EOF was last read to end of file ?
sec anticipate some other error.
bne L43B7 branch if not eof error.
jsr svmark
jsr zipdata clear out data block.
ldy #$00 provide dummy back pointer for future
ldx fcbptr re-position. x = hi byte of last block
L43A6 lda FCBs+FCB.DBLK,x
sta (datptr),y
stz FCBs+FCB.DBLK,x mark current block as impossible
inx
iny inc indexes to do both hi and low bytes
cpy #$02
bne L43A6
L43B6 clc no error
L43B7 rts
L43B8 jmp errfix1 report how much xfer'd before error.
mvcbytes ldy #$04 move request count to a more accessable location
lda (A3L),y
sta cbytes
sta rwreql
iny
lda (A3L),y
sta cbytes+1
sta rwreqh
ldy fcbptr return y = val(fcbptr),
lda FCBs+FCB.ACCESS,y a = attributes
clc and carry clear...
rts
mvdbufr ldy #$02 move the pointer to user's buffer
lda (A3L),y to the block file manager
sta usrbuf z-page area
iny
lda (A3L),y
sta usrbuf+1
gfcbstyp ldy fcbptr return storage type
lda FCBs+FCB.STYPE,y
rts
* this subroutine adds the requested byte count to mark and returns sum
* in scrtch and also returns mark in tpos and oldmark.
*
* on exit:
* y,x,a is unknown
* carry set indicates scrtch > eof
calcmrk ldx #$00
ldy fcbptr
clc
L43EE lda FCBs+FCB.MARK,y
sta tposll,x
sta oldmark,x
adc cbytes,x
sta scrtch,x
txa
eor #$02 cbytes+2 always=0
beq eoftest
iny
inx
bne L43EE always.
eoftest lda scrtch,x new mark in scrtch.
cmp FCBs+FCB.EOF,y is new position > eof ?
bcc L4414 no, proceed.
bne L4414 yes, adjust 'cbytes' request
dey
dex all tree bytes compared ?
bpl eoftest no, test next lowest
L4414 rts
werreof jsr plus2fcb reset eof to pre-error position.
L4418 lda oldeof,x place oldeof back into fcb
sta FCBs+FCB.EOF,y
lda oldmark,x also reset mark to last best
sta FCBs+FCB.MARK,y write position
sta scrtch,x and copy mark to scrtch for test of
dey eof less than mark.
dex
bpl L4418
jsr plus2fcb get pointers to test eof < mark.
jsr eoftest carry set means mark > eof !!
* drop into wadjeof to adjust eof to mark if necessary
wadjeof jsr plus2fcb get y=fcbptr+2, x=2, a=y.
L4434 lda FCBs+FCB.EOF,y copy eof to old eof
sta oldeof,x
bcc L4442 and if carry set...
lda scrtch,x then copy scrtch to fcb's eof.
sta FCBs+FCB.EOF,y
L4442 dey
dex copy all 3 bytes
bpl L4434
rts
plus2fcb lda #$02 on exit both a and y = fcbptr+2.
tax x = 2
ora fcbptr
tay
rts
*--------------------------------------
XDOS.Write jsr mvcbytes first determine if requested write is legal.
pha
jsr calcmrk save a copy of eof to old eof, set/clr
jsr wadjeof carry to determine if new mark > eof.
pla get attributes again.
and #$02 is write enabled ?
bne L4462 yes, continue...
L445E lda #$4E illegal access error.
bne L44A2
L4462 jsr tstwprot otherwise, make sure device is not
bcs L44A2 write protected. if so, branch to abort.
lda cbytes
ora cbytes+1 anything to write ?
bne L4472 branch if so,
jmp rwdone else do nothing.
L4472 jsr mvdbufr move the user's buffer ptr to bfm zero
cmp #$04 page area, also get storage type.
bcs L445E if not tree, return an access error.
L4479 jsr rdposn
bcs L44A2
jsr gfcbstat
and #$07
beq L44E9
ldy #$00 is enough disk space available for
L4487 iny indexes and data block ?
lsr
bne L4487
sty reql
sta reqh
jsr tstfrblk
bcs L44A2 pass back any errors.
jsr gfcbstat now get more specific.
and #$04 are we lacking a tree top ?
beq L44AC no, test for lack of sapling level index
jsr topdown go allocate tree top and adj file type.
bcc L44B8 continue with allocation of data block.
L44A2 pha save error.
jsr errfix1 error return.
jsr werreof adjust eof and mark to pre-error state.
pla restore error code.
sec
rts
L44AC jsr gfcbstat get status byte again.
and #$02 do we need a sapling level index block ?
beq L44B8 no, assume it's just a data block needed
jsr sapdown go alloc an indx blk and update tree top
bcs L44A2 if error.
L44B8 jsr alcwblk go allocate for data block.
bcs L44A2
jsr gfcbstat clear allocation required bits in status
ora #$80 but first indicate index block is dirty.
and #$F8
sta FCBs+FCB.F,y
lda tposhi calculate position within index block.
lsr
lda tposlh
ror
tay now put block address into index block.
inc zpt+1 high byte first.
lda scrtch+1
tax
sta (zpt),y
dec zpt+1 restore pointer to lower page of index
lda scrtch block. get low block address.
sta (zpt),y store low address.
ldy fcbptr update fcb to indicate that this block
sta FCBs+FCB.DBLK,y is allocated.
txa get high address again.
sta FCBs+FCB.DBLK+1,y
L44E9 jsr preprw
jsr wrtpart
bvc L4479
jmp rwdone update fcb with new position
wrtpart txa
bne L44FF branch if request is not even pages
lda rwreqh a call of 0 bytes should never get here!
beq L4546 do nothing
dec rwreqh
L44FF dex
lda (usrbuf),y move data from user's buffer
sta (sos),y
txa
beq L4525
L4507 iny page crossed ?
bne L44FF no, keep moving.
lda sos+1 test for end of buffer
inc usrbuf+1 but first adjust user buffer pointer
inc tposlh and position
bne L451C
inc tposhi
bne L451C
lda #MLI.E.BEYEOF out of range if > 32MB
bne L44A2
L451C inc sos+1 adjust sos buffer high address
eor datptr+1 (carry is undisturbed)
beq L44FF branch if more to write to buffer.
clv indicates not finished.
bvc L4549 always.
L4525 lda rwreqh
beq L4539 branch if request satisfied.
iny done with this block of data ?
bne L4533 if not.
lda sos+1 this is necessary for proper
eor datptr+1 adjustment of request count
bne L4536
L4533 dec rwreqh
L4536 dey reset modified y
bra L4507
L4539 iny and position
bne L4546
inc usrbuf+1 inc pointers
inc tposlh
bne L4546
inc tposhi
L4546 bit setvflg set v flag
L4549 sty tposll save low position
stx rwreql and remainder of request count.
php save statuses
jsr gfcbstat
ora #$50
sta FCBs+FCB.F,y
clc adjust user's low buffer address
lda tposll
adc usrbuf
sta usrbuf
bcc L4564
inc usrbuf+1 adjust high address as needed.
L4564 jsr fcbused set directory flush bit.
plp restore return statuses
rts
topdown jsr swapdown make current 1st block an entry in new
bcs L45B1 top. branch if errors.
jsr gfcbstyp get storage type
* has storage type been changed to 'tree' ? if not, assume it was originally
* a seed and both levels need to be built. otherwise, only an index needs
* to be allocated.
cmp #$03 tree type
beq L457A
jsr swapdown make previous swap a sap level index
bcs L45B1 block. branch if errors.
L457A jsr alcwblk get another block address for the sap
bcs L45B1 level index. branch if errors.
lda tposhi calculate position of new index block
lsr in the top of the tree.
tay
lda scrtch get address of newly allocated index
tax block again.
sta (zpt),y
inc zpt+1
lda scrtch+1
sta (zpt),y save hi address
dec zpt+1
ldy fcbptr make newly allocated block the current
sta FCBs+FCB.IBLK+1,y index block.
txa
sta FCBs+FCB.IBLK,y
jsr wfcbfst save new top of tree
bcs L45B1
jmp zeroindex zero index block in user's i/o buffer.
sapdown jsr gfcbstyp find out if dealing with a tree.
cmp #$01 if seed then adj to file type is needed.
beq swapdown branch if seed
jsr rfcbfst otherwise read in top of tree.
bcc L457A if no error.
L45B1 rts return errors.
swapdown jsr alcwblk make current seed into a sapling, allocate a block before swap.
bcs L45F6 return errors.
ldy fcbptr get previous first block
lda FCBs+FCB.1stBLK,y address into index block.
pha save temporarily while swapping in new
lda scrtch top index. get new block address (low)
tax
sta FCBs+FCB.1stBLK,y
lda FCBs+FCB.1stBLK+1,y
pha
lda scrtch+1 and high address too
sta FCBs+FCB.1stBLK+1,y
sta FCBs+FCB.IBLK+1,y make new top also the current index in
txa memory. get low address again.
sta FCBs+FCB.IBLK,y
inc zpt+1 make previous the 1st entry in sub index
pla
sta (zpt)
dec zpt+1
pla
sta (zpt)
jsr wfcbfst save new file top.
bcs L45F6 if error.
jsr gfcbstyp now adjust storage type by adding 1
* adc #$01 (seed becomes sapling becomes tree)
inc
sta FCBs+FCB.STYPE,y
lda FCBs+FCB.F,y mark storage type modified
ora #FCB.F.STMOD
sta FCBs+FCB.F,y
clc no error
L45F6 rts
alcwblk jsr alc1blk
bcs L4616
jsr gfcbstat mark usage as modified
ora #FCB.F.UMOD
sta FCBs+FCB.F,y
lda FCBs+FCB.UBLK,y inc current usage count by 1
inc
sta FCBs+FCB.UBLK,y
bne L4615
lda FCBs+FCB.UBLK+1,y
inc
sta FCBs+FCB.UBLK+1,y
L4615 clc no error
L4616 rts
tstwprot jsr gfcbstat check for 'never been modified' condition
and #$F0
bne L4615 ordinary rts if known write ok.
lda FCBs+FCB.DEVID,y get file's dev #.
sta devnum get current status of block device.
twrprot1 sta unitnum make the device status call
lda bloknml+1
pha
lda bloknml save the current block values
pha
stz A4L
stz bloknml zero the block #
stz bloknml+1
php
sei
jsr dmgr
bcs .1 branch if write protect error
lda #$00 otherwise, assume no errors.
.1 plp restore interrupt status
clc
tax save error.
beq .2 branch if no error
sec else, set carry to show error.
.2 pla
sta bloknml restore the block #
pla
sta bloknml+1
txa
rts carry is indeterminate.
*--------------------------------------
MAN
SAVE usr/src/prodos.fx/prodos.s.xdos.d
LOAD usr/src/prodos.fx/prodos.s
ASM
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