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MM32.asm
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\\** MM32.asm by Martin Mather 11th May 2019
LBA_FAT=VID2 ;16bit
LBA_DATA=VID2+2 ;16bit
CLUST_SIZE=VID2+4 ;8bit
CHAIN_INDEX=VID2+5 ;3*24bit
ATTRIB_X=&C2 ;8bit
FRAG_X=&CE ;8bit
CLUST_X=&C8 ;24bit
SECT_X=&CB ;8bit
CLUST_Y=MA+&10A0 ;32bit
mm32_sector%=MA+&10A4 ;8bit
mm32_track%=MA+&10A5 ;8bit
mm32_error%=MA+&10A6 ;8bit
mm32_taddr%=MA+&10AA ;32bit
mm32_star = 1 ;String markers
mm32_hash = 2
\B0-B2
mm32_zptr%=&B0 ; 16 bit
mm32_flags%=&B2 ; 8 bit : bit 7 = directories only
\B5-B9
mm32_logging%=&B7 ; 8 bit : bit 7 = cataloguing
mm32_cluster%=&B7 ; 24 bit
mm32_attrib%=&B9 ; 8 bit
mm32_str%=MA+&1000 ; 1000 - 103F (64 bytes)
mm32_drvtbl%=MA+&11C0 ; 11C0 - 11DF (32 bytes)
;; FOR INFO: sec%=&BE
IF _MM32_DEBUG
\ Temp command
.mm32_cmd_dbug
{
;JSR mm32_param_count
;bcc l1
;JSR mm32_param_drive
;ror a
;lda #0
;ror a
;sta _XX32FLAG ;temp flag
;jsr PrintHex
;jmp OSNEWL
.l1 jsr PrintString
EQUS "FAT-LBA "
ldy #LBA_FAT-VID2
jsr phex2
jsr PrintString
EQUS "DATA-LBA "
ldy #LBA_DATA-VID2
jsr phex2
jsr PrintString
EQUS "CLUST SZ "
ldy #CLUST_SIZE-VID2
jsr phex1
ldx #0
.loop
txa
jsr PrintHex
lda #':'
jsr OSWRCH
jsr mm32_pclust
jsr OSNEWL
inx
cpx #3
bne loop
rts
.phex2
lda VID2+1,Y
jsr PrintHex
.phex1
lda VID2,Y
jsr PrintHex
jmp OSNEWL
}
\ DEBUG: Print CHAIN_INDEX entry.
.mm32_pclust
{
lda CHAIN_INDEX+6,X
jsr PrintHex
lda CHAIN_INDEX+3,X
jsr PrintHex
lda CHAIN_INDEX,X
jsr PrintHex
RTS
}
ENDIF
\\ Read 512 byte sector into catalogue area
.mm32_readblock
LDA #&FF
STA CurrentCat
JMP MMC_ReadCatalogue
.mm32_init_dos
{
\ Byte order must match VID
lba_fat% = &C7 ;16 bit
lba_data% = &C9 ;16 bit
clust_size% = &CB ;8 bit
JSR CheckCRC7
LDA CLUST_SIZE ; If >0 already done
BEQ init
RTS
.init
{
JSR read_VBR
BCC faterr ; Couldn't read VBR
\\ BIOS Parameter Block (BPB)
LDA cat%+&0C
CMP #2
BNE faterr ; Sector size <> 512 bytes
; A=2
EOR cat%+&2C
ORA cat%+&26
BNE faterr ; Root Dir Cluster <> 2 or FAT size > 65535
LDA cat%+&25
LSR A
BEQ faterr ; FAT size < 512 so can't be FAT32
\\ If no error then:
\\ 1) Sector Size = 512 bytes
\\ 2) Size of FAT >= 512 and < 65536
\\ 3) Root Directory starts in cluster 2
\\ (We've assumed some bytes are zero.)
\\ Remember the cluster size (in sectors)
LDA cat%+&0D
STA clust_size%
\\ Now calc LBA of FAT area
LDA lba_fat%
LDY lba_fat%+1
CLC
ADC cat%+&0E ; LBA of VBR + Reserved sectors
TAX
TYA
ADC cat%+&0F
BCS faterr ; Overflow
STX lba_fat%
STA lba_fat%+1
\\ Now add size of FAT area to get LBA of data area
;C=0
.loop1
TAY
TXA
ADC cat%+&24
TAX
TYA
ADC cat%+&25
BCS faterr ; Overflow
DEC cat%+&10
BNE loop1
TAY
\\ Subtract 2 * Cluster size
ASL cat%+&0D
TXA
SEC
SBC cat%+&0D
STA lba_data%
TYA
SBC #0
STA lba_data%+1
\\ Now we have populated:
\\ clust_size%, lba_fat% and lba_data%
\\ and we know the root directory is at cluster 2
\ No errors so copy to VID
JSR CheckCRC7
JSR MMC_GetCIDCRC ; Remember card id
STA MMC_CIDCRC+1
STY MMC_CIDCRC
LDY #5
.loop2
LDA lba_fat%-1,Y
STA LBA_FAT-1,Y
DEY
BNE loop2
TYA ; A=0
LDY #8
\ Reset CHAIN_INDEX
.loop3
STA CHAIN_INDEX,Y
DEY
BPL loop3
JMP ResetCRC7
.faterr
JSR ReportError
EQUB &FF
EQUS "Card format?",0
}
\\ Read VBR, on exit C=1 if successful,
\\ and lba_fat% contains LBA of FAT.
.read_VBR
{
\\ Read sector 0 (MBR)
LDA #0
STA lba_fat%
STA lba_fat%+1
STA sec%
STA sec%+1
STA sec%+2
; get MBR?
JSR isfat
BCC ifx ; FAT not recognised
\\ Boot sector signature 0x55 0xAA found
\\ Test for presence of FAT Partition Boot Sector
\\ 0x000 = 0xEB xx 0x90 is a good indicator
\\ If this is not found, then assume sector 0 is an MBR
LDA cat%
CMP #&EB
BNE mbr
LDA cat%+2
CMP #&90
BNE mbr
LDA cat%+&C
CMP #&02
BEQ ifx
.mbr
\\ VBR sec = cat!&1C6 * 2
\\ Must be less than 2^16
LDA cat%+&1C6
STA lba_fat%
STA sec%
LDA cat%+&1C7
STA lba_fat%+1
STA sec%+1
LDA cat%+&1C8
ORA cat%+&1C9
BNE bad
; A=0
STA sec%+2
JSR mm32_lba_to_256
; get VBR
\\ FAT signature word?
.isfat
JSR mm32_readblock
LDA cat%+&1FE
CMP #&55
BNE bad
LDA cat%+&1FF
CMP #&AA
BNE bad
.ifx
RTS
.bad
CLC
RTS
}
}
\\ Initialise CLUST_X, SECT_X and ATTRIB_X
\\ Copies cluster from chain index.
\\ On entry Y=index (0=Drive 0, 1=Drive 1 or 2=Current Dir)
\\ If Y<2 then V=1 if drive empty
.mm32_SECT_X_First
{
LDA CHAIN_INDEX,Y
STA CLUST_X
LDA CHAIN_INDEX+3,Y
STA CLUST_X+1
LDA CHAIN_INDEX+6,Y
STA ATTRIB_X ; Save flags
AND #&3F
STA CLUST_X+2
ORA CLUST_X
ORA CLUST_X+1
BNE l2
CPY #2
BEQ l1 ; If current directory
\ If 'root' in drive, should be read only.
BIT ATTRIB_X
BPL l3 ; If read only flag clear
\ If zero, assume root directory at cluster 2
.l1 LDA #2
STA CLUST_X
.l2 LDA CLUST_SIZE ; A > 0
STA SECT_X ; Reset sector counter
LDA #0
STA FRAG_X
CLV
RTS
.l3 BIT l4 ; Set V
.l4 RTS
}
\\ Get next sector in cluster chain
\\ On exit:
\\ If C=1 then EOC or overflow error
\\ else CLUST_X + SECT_X point to sector.
\\ X & Y preserved
.mm32_SECT_X_Next
{
{
DEC SECT_X
BEQ l1 ; If zero go to next cluster
CLC
RTS
.l1 JSR next_cluster
LDA CLUST_SIZE
STA SECT_X ; Reset sector counter
RTS
}
\ Current cluster in CLUST_X (22 bit)
\ On exit, if C=1 then End of Chain (EOC) else CLUST_X is next cluster
\ X & Y preserved.
\ Uses one byte in zero page.
.next_cluster
{
JSR RememberXYonly
DEC FRAG_X
BPL l1
LDA TubeNoTransferIf0
PHA
LDA datptr%
PHA
LDA datptr%+1
PHA
LDA byteslastsec%
PHA
JSR read_fat
PLA
STA byteslastsec%
PLA
STA datptr%+1
PLA
STA datptr%
PLA
STA TubeNoTransferIf0
.l1 CLC
LDA FRAG_X
BEQ l4
INC CLUST_X
BNE l3
INC CLUST_X+1
BNE l3
INC CLUST_X+2
.l2 LDA CLUST_X+2
AND #&C0
BEQ l3
SEC
.l3 RTS
.l4 LDX #2
.loop1
LDA CLUST_Y,X
STA CLUST_X,X
DEX
BPL loop1
BMI l2
}
\ Read FAT table
\ On exit: FRAG_X is the size of the fragment (max = 127)
\ + CLUST_Y (first cluster of next fragment)
.read_fat
{
n = SECT_X ; 8bit
; Calc FAT sector address
LDA CLUST_X
ASL A
STA n
LDA CLUST_X+1
ROL A
TAY
LDA CLUST_X+2
ROL A
TAX
;CLC
TYA
ADC LBA_FAT
STA sec%
TXA
ADC LBA_FAT+1
STA sec%+1
LDA #0
STA TubeNoTransferIf0
STA sec%+2
JSR mm32_lba_to_256
; Read FAT sector
JSR SetLEDS
JSR MMC_SetupRead
JSR MMC_StartRead
LDA #LO(CLUST_Y)
STA datptr%
LDA #HI(CLUST_Y)
STA datptr%+1
LDA n
JSR clocks
.loop1
INC FRAG_X
LDA #4
STA byteslastsec%
JSR MMC_ReadBLS
INC n
INC n
BEQ l4 ; If end of sector
SEC
LDA CLUST_Y+2
AND #&C0
ORA CLUST_Y+3
BNE l2 ; If CLUST_Y >= &400000, then EOC
;SEC
LDA CLUST_Y
SBC CLUST_X
TAY
LDA CLUST_Y+1
SBC CLUST_X+1
BNE l3
LDA CLUST_Y+2
SBC CLUST_X+2
BNE l3
DEY
;Y=CLUST_Y-CLUST_X-1
CPY FRAG_X
BEQ loop1
BNE l3
; EOC , set bit 23
.l2 ROR CLUST_Y+2
.l3 SEC
LDA #0
SBC n
JSR clocks
.l4 JSR MMC_16Clocks
JMP ResetLEDS
}
\ Do A*2 clocks (note A must be even)
.clocks
{
ASL A
PHA
BCC l1
LDY #0
JSR MMC_Clocks
.l1 PLA
BEQ l2
TAY
JMP MMC_Clocks
.l2 RTS
}
}
\\ Scan the current directory
\\ On exit: C=0 if file/dir found
.mm32_Scan_Dir
{
is_dir%=&B8
{
LDY #2
JSR mm32_SECT_X_First
.loop1
JSR mm32_SECT_X_Address
BCS exit ; If overflow error (C=1)
JSR mm32_readblock
JSR scan_block
BCC exit ; File/Dir found
BEQ exit ; C=1, End of dir
JSR mm32_SECT_X_Next
BCC loop1 ; If not EOC and no error
;C=1
.exit
RTS
}
\\ Scan sector of directory for valid entries.
\\ On exit A=0 & Z=1 if end of dir found
.scan_block
{
z = mm32_zptr%
LDA #0
STA &AB ; Use &AB as a writeback flag
STA z
LDA #HI(cat%)
.loop1
STA z+1
.loop2
LDY #0
LDA (z),Y ; First chr of name
BEQ exit ; Z=1, End of directory
BMI skip ; If A>=128
CMP #&21
BCC skip ; If A<=32
\Is cluster number too large? (i.e. >20 bits)
LDY #21
LDA (z),Y
AND #&0F
BNE skip
DEY
LDA (z),Y
AND #&F0
BNE skip
LDY #11
LDA (z),Y ; A = Attributes
AND #&0E
BNE skip ; If long filename/hidden/system/volume name
LDA (z),Y
LSR A ; C=Read only
AND #&08
STA is_dir%
BEQ l1 ; If not dir
LDA #&80 ; If directory, always read only
;LDA (z),Y
;LSR A
;ROR A
BNE l2 ; Always
.l1 BIT mm32_flags%
BMI skip ; Only looking at directories
; A=0
ROR A ; Bit 7 = Read only
STA mm32_attrib%
JSR is_XSD
ORA mm32_attrib%
.l2 STA mm32_attrib%
;jsr PrintHex
JSR copy_name
JSR dir_match
BCS skip ; Didn't match
LDA &AA ; Command: 0 NOP, 1 Unlock, 2 lock, 3 rename
BEQ s1 ; Cmd 0 -> Do nothing
IF _MM32_DRENAME
CMP #3 ; Cmd 3 -> Rename
BNE lock_or_unlock
JMP rename_fat_file
.lock_or_unlock
ENDIF
CMP #2 ; Cmd 2 -> Lock file
BEQ lock
JSR unlock_fat_file
JMP s1
.lock
JSR lock_fat_file
.s1
BIT mm32_logging%
BMI logging
;jsr print_dir_entry
;lda #&20
;jsr PrintChrA
CLC ;C=0 = FOUND
RTS
.logging
JSR print_dir_entry
.skip
JSR CheckESCAPE
CLC
LDA z
ADC #32
STA z
BCC loop2
LDA z+1
ADC #0
CMP #HI(cat%)+1
BEQ loop1
;Z=0
.exit
PHP ; Preserve flags for return
PHA ; Preserve A for return
LDA &AB ; If &AB is &FF then writeback
CMP #&FF
BNE nowrite
JSR MMC_WriteCatalogue
.nowrite
LDY #&00 ; Clear writeback flag
STY &AB
PLA ; Get A back
PLP ; Get flags back!
SEC
RTS
}
\\ Set read only bit
.lock_fat_file
{
z = mm32_zptr%
LDA #&80 ; Set 'L' flag in logging printout
STA mm32_attrib%
LDY #11
LDA (z),Y ; Attribs
ORA #&01 ; Set r/o bit
STA (z),Y
LDA #&FF ; Writeback flag
STA &AB
RTS
}
\\ Clear read only bit
.unlock_fat_file
{
z = mm32_zptr%
LDA #&00 ; Clear 'L' flag in logging printout
STA mm32_attrib%
LDY #11
LDA (z),Y ; Attribs
AND #&FE ; Clear r/o bit
STA (z),Y
LDA #&FF ; Writeback flag
STA &AB
RTS
}
IF _MM32_DRENAME
\\ Rename a file
.rename_fat_file
{
; Copy the target name into the directory entry
LDX #33 ; name starts at mm32_str%+32 plus one to skip the mm32_hash
\\ Copy filename from (mm32_str%+X) into the directory entry
{
z = mm32_zptr%
str = mm32_str%
endchar = &BA ; dot or space
maxindex = &BB ; 8 or 11
LDY #0
LDA #'.'
STA endchar
LDA #8
JSR copy_and_pad_with_spaces
LDA #mm32_hash
STA endchar
LDA #11
; Copy part of the name, up to A characters, pad with spaces,
; end at the char stored at 'endchar'
.copy_and_pad_with_spaces
STA maxindex
.loop
LDA str,X
INX
CMP endchar
BEQ pad
CPY maxindex
BEQ loop
STA (z),Y
INY
BNE loop ; always
; Pad destination with spaces if necessary
.padloop
LDA #' '
STA (z),Y
INY
.pad
CPY maxindex
BNE padloop
}
; Write the directory to the card
JSR MMC_WriteCatalogue
; End mm32_Scan_Dir
CLC
RTS
}
ENDIF
\\ Copy name from directory
.copy_name
{
z = mm32_zptr%
str = mm32_str%
LDX #1
LDY #0
.loop1
LDA (z),Y
CMP #&21
BCC l1
STA str,X
INX
.l1 INY
CPY #8
BNE l2
.l11
LDA #'.'
STA str,X
INX
.l2 CPY #11
BNE loop1
.l3 LDA #mm32_hash
STA str
STA str,X
LDA #0
STA str+1,X
RTS
}
\\ Print directory entry
\\ Note: Cannot be spooled
.print_dir_entry
{
;z = mm32_zptr%
str = mm32_str%
LDX #3
JSR lspc
LDX #&20
LDA is_dir%
BEQ l99 ; If not directory
LDX #'/'
.l99
TXA
LDY #1
LDX #14
.loop1
JSR PrintChrA ; Print '/' or space
LDA str,Y
CMP #&20
BCC lx
CMP #'.'
BEQ l1
.l0 DEX
INY
BNE loop1 ; Always
.l1 LDA str+1,Y ; Skip trailing dot
CMP #&20
LDA #'.'
BCS l0
.lx JSR lspc
LDA #'L'
BIT mm32_attrib% ; Flags
BMI l00 ; If read only
LDA #' '
.l00
JSR PrintChrA ; Print 'L' or space
JMP PrintSpace
; Pad with X spaces
.lspc
JSR PrintSpace
DEX
BNE lspc
RTS ; A=&20
}
\\ Is it a SSD or DSD file?
\\ Result retured in A
\\ On exit: Bit 7 set if not disk image, bit 6 set if double sided image
.is_XSD
{
z = mm32_zptr%
ssd=&00
dsd=&20
LDY #11
LDA (z),Y
AND #&10
BNE l2 ; It's a directory
IF TRUE
LDX #&FF
.loop1
LDY #8
CLC
.loop2
INX
LDA ext_table,X
BMI x2 ; end of record
BEQ l2 ; end of table (no matches found)
EOR (z),Y
BEQ x1
SEC
.x1 INY
BNE loop2 ; always
.x2 BCS loop1 ; not a match
ASL A
RTS
ELSE
DEY ; Last chr of extension
LDA (z),Y
CMP #'D'
BNE l2
DEY
LDA (z),Y
CMP #'S'
BNE l2
DEY
LDA (z),Y
CMP #'S'
CLC
BEQ l1
CMP #'D'
BNE l2
.l1 ROR A
LSR A ; Bit 7 clear if SSD or DSD, Bit 6 set if DSD
AND #&C0
RTS
ENDIF
.l2 LDA #&80 ; Bit 7 set
RTS
IF TRUE
.ext_table
EQUB "SSD", &80+ssd
EQUB "DSD", &80+dsd
BRK ;End of table
ENDIF
}
\\ Match name with command line parameter
.dir_match
{
str = mm32_str%
ix = &BA
iy = &BB
; str offsets
strX = 16
strY = 0
LDX #strX-1
LDY #strY
.l00
INX
STX ix
.l0
STY iy
.l1 LDA str,X
BEQ ex1 ; If successful
CMP #mm32_star
BEQ l00 ; So far so good