mirror of
https://github.com/antoinevignau/source.git
synced 2024-06-01 00:41:39 +00:00
547 lines
9.4 KiB
ArmAsm
547 lines
9.4 KiB
ArmAsm
*
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* AppleSqueezer RAMDISK
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*
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*
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* (c) 2022, Brutal Deluxe Software
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*
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* v1.0 (20230104) - AV
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* Works on a single 32MB partition only
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* v1.1 (20230105) - AV
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* Adds support for formatting options (Hello HFS)
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mx %00
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rel
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typ $bb
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dsk ASRamdisk
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use AS.EQUATES.S
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use 4/Sch.Macs
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use 4/Util.Macs
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*
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* Entry point
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*
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RAMDisk da MyDIB-RAMDisk ; offset to 1st DIB
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dw maxIMAGES ; number of devices
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dw $0000 ; no configuration list
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*
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* Dispatch routine
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*
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entryPOINT phk ; Dispatch
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plb
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cmp #$0009
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bcc L0012
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lda #$0020
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bra L001D
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L0012 asl
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tax
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stz errCODE
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jsr (tblDISPATCH,x)
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lda errCODE
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L001D cmp #$0001
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rtl
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tblDISPATCH da DStartup ; Driver_Startup
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da DOpen ; Driver_Open
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da DRead ; Driver_Read
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da DWrite ; Driver_Write
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da DClose ; Driver_Close
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da DStatus ; Driver_Status
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da DControl ; Driver_Control
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da DFlush ; Driver_Flush
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da DShutdown ; Driver_Shutdown
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*
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* Driver_Startup
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*
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DStartup
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ldal FL_IDLE
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and #$ff
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cmp #$01
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bne DShutdown ; no AS found
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ldal FL_VERSION
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and #$ff
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cmp #minVERSION
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bcc DShutdown ; no minimum version
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lda #1 ; we're on
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sta fgSTARTED
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sep #$30
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ldx #0
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]lp lda proDEVNAME+3,x
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sta MyDevName+1,x
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inx
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cpx #9
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bcc ]lp
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stx MyDevName
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rep #$30
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PushWord #0
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PushLong #myTASK
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_SchAddTask
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pla
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rts
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*
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* Driver_Shutdown
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*
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DShutdown stz fgSTARTED
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*
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* Driver_Open
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* Driver_Close
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* Driver_Flush
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*
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DOpen ; Driver_Open
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DClose ; Driver_Close
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DFlush ; Driver_Flush
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rts
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*
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* Driver_Read
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*
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DRead jsr doSETUP
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bcc dr1
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rts
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*--- The AS magic is here
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dr1 pei bufferPtr+1 ; save pointer
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sep #$20
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lda thePAGE+2
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stal exdram_address_set_main_bank
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lda #0
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stal exdram_address_set_addr_low
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lda thePAGE
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stal exdram_address_set_addr_high
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lda thePAGE+1
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stal exdram_address_set_addr_bank
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ldx nbPAGES ; number of 512-byte pages to copy
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dr2 ldy #0 ; read one block
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sep #$20
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]lp ldal exdram_address_access
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sta [bufferPtr],y
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iny
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cpy #blockSIZE
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bcc ]lp
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rep #$20 ; move destination pointer
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lda bufferPtr+1
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clc
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adc #>blockSIZE ; rwBlockSize+1
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sta bufferPtr+1
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dex ; next block
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bne dr2
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pla ; restore pointer
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sta bufferPtr+1
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rts
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*--- The AS magic ends here
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*
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* Driver_Write
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*
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DWrite jsr doSETUP
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bcc dw1
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rts
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*--- The AS magic is here
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dw1 pei bufferPtr+1 ; save pointer
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sep #$20
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lda thePAGE+2
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stal exdram_address_set_main_bank
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lda #0
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stal exdram_address_set_addr_low
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lda thePAGE
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stal exdram_address_set_addr_high
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lda thePAGE+1
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stal exdram_address_set_addr_bank
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ldx nbPAGES ; number of 512 bytes pages to copy
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dw2 ldy #0 ; write one block
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sep #$20
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]lp lda [bufferPtr],y
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stal exdram_address_access
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iny
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cpy #blockSIZE
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bcc ]lp
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rep #$20 ; move destination pointer
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lda bufferPtr+1
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clc
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adc #>blockSIZE ; rwBlockSize+1
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sta bufferPtr+1
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dex ; next page
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bne dw2
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pla ; restore pointer
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sta bufferPtr+1
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rts
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*--- The AS magic ends here
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*
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* Driver_Status
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*
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DStatus lda statusCode
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cmp #4+1
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bcc DStatus1
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lda #$0021 ; drvrBadCode
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sta errCODE
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rts
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DStatus1 asl
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tax
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stz transferCount
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stz transferCount+2
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jsr (tblSTATUS,x)
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rts
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tblSTATUS da SGetStatus ; GetDeviceStatus
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da SGet ; GetConfigParameters
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da SGet ; GetWaitStatus
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da SGetFormatOptions ; GetFormatOptions
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da SNada ; GetPartitionMap
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SNada rts
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*----------- GetDeviceStatus
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SGetStatus lda #2 ; GetDeviceStatus
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sta transferCount
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lda requestCount ; check length of buffer
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cmp #6
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bcc SGS1
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lda #6
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sta transferCount
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ldy #2 ; we can send the number of blocks
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lda #maxBLOCKH
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sta [statusListPtr],y
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iny
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iny
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lda #^maxBLOCKH
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sta [statusListPtr],y
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SGS1 ldx #diskInDriveBit
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lda fgSTARTED ; send the status of the driver
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bne SGS2
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inx
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SGS2 txa
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ora #uncertainBlockCountBit ; we are uncertain of the block count
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sta [statusListPtr]
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rts
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*----------- GetConfigParameters / GetWaitStatus
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SGet lda #0 ; GetConfigParameters
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sta [statusListPtr] ; GetWaitStatus
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lda #2
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sta transferCount
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rts
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*----------- GetFormatOptions
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SGetFormatOptions
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lda requestCount ; check size of buffer
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cmp #formatOptionsTableEnd-formatOptionsTable
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bcc SGetFormat1
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ldy #0 ; and move data
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]lp lda formatOptionsTable,y
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sta [statusListPtr],y
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iny
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iny
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cpy #formatOptionsTableEnd-formatOptionsTable
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bcc ]lp
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sty transferCount ; save size
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SGetFormat1 rts
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*
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* Driver_Control
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*
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DControl jsr checkSWITCHED
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bcc DControl1
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rts
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DControl1 lda controlCode
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cmp #9+1
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bcc DControl2
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lda #$0021
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sta errCODE
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rts
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DControl2 asl
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tax
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stz transferCount
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stz transferCount+2
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jsr (tblCONTROL,x)
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rts
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tblCONTROL da CNada ; 0 ResetDevice
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da CFormatDevice ; 1 FormatDevice
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da CNada ; 2 EjectMedium
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da CSet ; 3 SetConfigParameters
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da CSet ; 4 SetWaitStatus
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da CSetFormatOptions ; 5 SetFormatOptions
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da CNada ; 6 AssignPartitionOwner
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da CNada ; 7 ArmSignal
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da CNada ; 8 DisarmSignal
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da CNada ; 9 SetPartitionMap
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CNada rts
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*----------- FormatDevice
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CFormatDevice
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lda fgFORMAT ; if 1, the Format call
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bne CFormat1 ; was already called
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rts
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CFormat1 lda #0
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sep #$20
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stal exdram_address_set_main_bank
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stal exdram_address_set_addr_low
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stal exdram_address_set_addr_high
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stal exdram_address_set_addr_bank
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ldx fBlockCount+2
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ldy fBlockCount
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CFormat2 phx
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CFormat3 ldx #blockSIZE ; 512-byte blocks
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]lp stal exdram_address_access
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dex
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bne ]lp
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dey ; loop fBlockCount
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bne CFormat3
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plx ; loop fBlockCount+2
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dex
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bne CFormat2
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rep #$20
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rts
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*----------- SetFormatOptions
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CSetFormatOptions
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lda [controlListPtr]
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beq CSFO9 ; empty option is not ours
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cmp #3 ; 1-2 only
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bcs CSFO9
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cmp #1
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bne CSFOHFS
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ldx #^maxBLOCKH ; it is 1, default values for HFS
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ldy #maxBLOCKH
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bra CSFOAll
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CSFOHFS ldx #^maxBLOCKP ; it is 2, default values for ProDOS
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ldy #maxBLOCKP
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CSFOAll sty fBlockCount
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stx fBlockCount+2
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CSFO9 rts
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*----------- SetConfigParameters / SetWaitStatus
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CSet lda [controlListPtr] ; SetConfigParameters
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bne CSetERR ; SetWaitStatus
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rts
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CSetERR lda #$0022
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sta errCODE
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rts
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*----------------------------
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* Status flag of the current device
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* $0001: image has been switched (disk switched)
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* $0010: image is active (disk in drive)
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* $0100: image has been modified
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*
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* Checks everything is OK
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*
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doSETUP jsr checkSWITCHED
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bcc ds2
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rts
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ds2 lda requestCount ; nb of bytes to read
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ora requestCount+2
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bne ds4
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lda #$002C ; invalidByteCount
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sta errCODE
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sec
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rts
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*--- From a Block to a RAM address
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ds4 lda blockNum ; get block number
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asl
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sta thePAGE ; to calculate
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lda blockNum+2 ; RAM address
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rol
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sta thePAGE+2
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lda requestCount+1 ; number of pages
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lsr
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sta nbPAGES ; to calculate
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lda requestCount ; multiple of $0200
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and #blockSIZE-1
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beq ds6
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lda #$002D ; bad block count
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sta errCODE
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sec
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rts
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*--- Generic transfer now
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ds6 lda requestCount ; assume transfer=request
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sta transferCount
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lda requestCount+2
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sta transferCount+2
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clc
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rts
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*----------------------------
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checkSWITCHED
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lda fgSTARTED
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bne cs1
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jsl SET_DISKSW
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lda #1
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sta fgSTARTED
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lda #$002e
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sta errCODE
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sec
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rts
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cs1 clc
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rts
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*---------------------------- Check RAMDISK was init'ed
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myTASK PushLong #proVOLUME
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PushWord #$2008
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jsl GSOS2
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bcc myTASK1
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PushLong #proFORMAT
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PushWord #$2024
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jsl GSOS2
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lda #1 ; tell the driver we've been there
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stal fgFORMAT ; a format will now be a real format
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lda #$4000 ; no more silent formatting
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stal proFORMAT+14
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myTASK1 rtl
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*---------------------------- GS/OS
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proVOLUME dw 2
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adrl proDEVNAME
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adrl outVOLNAME
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proFORMAT dw 5 ; +00
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adrl proDEVNAME ; +02
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adrl proVOLNAME ; +06
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dw 6 ; +10
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dw 6 ; +12 - Default is ProDOS
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dw $2000 ; +14 - Cant rename, can change selection, silent formatting
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proDEVNAME strl '.ASRAMDISK'
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proVOLNAME strl ':AppleSqueezer'
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outVOLNAME dw 36 ; (word) output buffer
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ds 34 ; (word) strl + (array) string
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*----------------------------
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formatOptionsTable
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* 8 bytes
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dw 2 ; numOptions
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dw 2 ; numDisplayed
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dw 1 ; recommendedOption
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dw 1 ; currentOption
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* 16 bytes
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dw 1 ; formatOptionNum
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dw 2 ; linkRefNum
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dw 9 ; flags 1001 - MB size - Apple format
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adrl maxBLOCKH ; blockCount is 491520 for HFS
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dw blockSIZE ; blockSize is 512 bytes
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dw 0 ; interleaveFactor
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dw 240 ; mediaSize 1000 - MB size
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* 16 bytes
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dw 2 ; formatOptionNum
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dw 0 ; linkRefNum
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dw 9 ; flags 1001 - MB size - Apple format
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adrl maxBLOCKP ; blockCount is 65536 for ProDOS 8
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dw blockSIZE ; blockSize is 512 bytes for ProDOS 8
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dw 0 ; interleaveFactor
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dw 32 ; mediaSize 1000 - MB size
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formatOptionsTableEnd
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*--- Default formatting options
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fBlockCount adrl maxBLOCKH ; 65536
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*----------------------------
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fgSTARTED ds 2 ; 0: not started, 1: started
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fgFORMAT ds 2 ; 0: GS/OS Format never called, 1 instead
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errCODE ds 2
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thePAGE ds 4 ; page to read/write: $hh/ll00
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nbPAGES ds 2 ; number of blockSIZEP pages to copy
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MyDIB ds 4 ; +00 pointer to the next DIB
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adrl entryPOINT ; +04 driver entry point
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dw dftCHAR ; +08 characteristics
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adrl maxBLOCKH ; +0A block count
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MyDevName ds 32 ; +0E device name
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dw $8000 ; +2E slot number
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dw $0001 ; +30 unit number
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dw dftVERSION ; +32 version
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dw dftRAMDISK ; +34 device ID
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dw $0000 ; +36 first linked device
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dw $0000 ; +38 next linked device
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adrl $00000000 ; +3A extended DIB ptr
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dw $0000 ; +3E device number
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