common DMA list in CBDOS

src/dos_m65/,aliases_dos.s

@@ -109,7 +109,14 @@
 	!addr FD_STATUS_IDX    = $806E ; - floppy
 	!addr RD_STATUS_IDX    = $806F ; - ram disk
 
-	!addr SD_DESC          = $8070 ; current file descriptor
+	!addr DMAJOB_LIST      = $8070 ; 15 bytes, a general purpose DMA list
+	!addr DMAJOB_SRC_MB    = DMAJOB_LIST+2
+	!addr DMAJOB_DST_MB    = DMAJOB_LIST+4
+	!addr DMAJOB_SIZE      = DMAJOB_LIST+7    ; keep $0200 here
+	!addr DMAJOB_SRC_ADDR  = DMAJOB_LIST+9
+	!addr DMAJOB_DST_ADDR  = DMAJOB_LIST+12
+
+	!addr SD_DESC          = $807F ; current file descriptor
 
 
 

src/dos_m65/assets/dos_dmalist_template.s

@@ -0,0 +1,11 @@
+
+dos_dmalist_template:
+
+	!byte $0A                         ; use F018A list format (it is shorter by 1 byte)
+	!byte $80, $00                    ; src. address is $00xxxxx
+	!byte $81, $00                    ; dst. address is $00xxxxx
+	!byte $00                         ; end of options
+	!byte $00                         ; operation: COPY
+	!word $0200                       ; data size if 512 bytes
+
+	; 3 bytes of src address + 3 bytes of dst address - not included in template

src/dos_m65/dev_sdcard/fs_hvsr_read_file.s

@@ -109,32 +109,22 @@ fs_hvsr_read_file:
 	lda #%10000000                    ; select SD card buffer
 	tsb SD_BUFCTL
 
-	lda #$02
+	; Copy data using DMA job
-	sta DMA_ADDRBANK                  ; $D702
-	lda #$00
-	sta DMA_ADDRMB                    ; $D704
 
-	lda #>(@dmalist-$4000)
+	lda #$00
-	sta DMA_ADDRMSB                   ; $D701
+	sta DMAJOB_DST_MB
-	lda #<(@dmalist-$4000)
+	lda #<(SHARED_BUF_0 - $8000)
-	sta DMA_ETRIG                     ; $D705
+	sta DMAJOB_DST_ADDR+0
+	lda #>(SHARED_BUF_0 - $8000)
+	sta DMAJOB_DST_ADDR+1
+	lda #$01
+	sta DMAJOB_DST_ADDR+2
+
+	jsr util_dma_launch_from_hwbuf    ; execute DMA job
 
 	clc
 	rts
 
-@dmalist:
-
-	!byte $0A                         ; use F018A list format (it is shorter by 1 byte)
-	!byte $80, $FF                    ; src. address is $FFxxxxx
-	!byte $81, $00                    ; dst. address is $00xxxxx
-	!byte $00                         ; end of options
-	!byte $00                         ; operation: COPY
-	!word $0200                       ; data size if 512 bytes
-	!byte $00, $6E, $0D               ; src. addr is $xxD6E00
-	!byte <(SHARED_BUF_0 - $8000)
-	!byte >(SHARED_BUF_0 - $8000)
-	!byte $01                         ; dst. addr is $xx1xxxx (internal buffer)
-
 fs_hvsr_file_not_found:
 
 	jsr fs_hvsr_direntmem_restore     ; restore $1000 memory content

src/dos_m65/dos_init.s

@@ -45,6 +45,15 @@ dos_INIT:
 	jsr dev_fd_init
 	jsr dev_rd_init
 
+	; Initialize DMA list
+
+	ldy #$08
+@2:
+	lda dos_dmalist_template, y
+	sta DMAJOB_LIST, y
+	dey
+	bpl @2:
+
 	; Initialize helper code in RAM
 
 	lda #$AD                 ; LDA opcode, absolute

src/dos_m65/utils/util_dma_launch.s

@@ -0,0 +1,33 @@
+
+; Launch the DMA list
+
+
+util_dma_launch_from_hwbuf:
+
+	; Operation from source $FFD6E00 (hardware SD card / floppy buffer)
+	; Destination has to be set by the caller
+
+	lda #$FF
+	sta DMAJOB_SRC_MB
+	lda #$00
+	sta DMAJOB_SRC_ADDR+0
+	lda #$6E
+	sta DMAJOB_SRC_ADDR+1
+	lda #$0D
+	sta DMAJOB_SRC_ADDR+2
+
+	; FALLTROUGH
+
+util_dma_launch:
+
+	lda #$01
+	sta DMA_ADDRBANK                  ; $D702
+	dec
+	sta DMA_ADDRMB                    ; $D704
+
+	lda #>(DMAJOB_LIST-$8000)
+	sta DMA_ADDRMSB                   ; $D701
+	lda #<(DMAJOB_LIST-$8000)
+	sta DMA_ETRIG                     ; $D705
+
+	rts