mirror of
https://github.com/cc65/cc65.git
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Added emd drivers
git-svn-id: svn://svn.cc65.org/cc65/trunk@1693 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz
parent
8369e0fe7a
commit
508af1ca21
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@ -4,6 +4,9 @@
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.SUFFIXES: .o .s .c
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#--------------------------------------------------------------------------
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# Rules
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%.o: %.c
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@$(CC) $(CFLAGS) $<
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@$(AS) -o $@ $(AFLAGS) $(*).s
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@ -11,6 +14,15 @@
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%.o: %.s
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@$(AS) -g -o $@ $(AFLAGS) $<
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%.emd: %.o ../runtime/zeropage.o
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@$(LD) -t module -o $@ $^
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%.tgi: %.o ../runtime/zeropage.o
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@$(LD) -t module -o $@ $^
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#--------------------------------------------------------------------------
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# Object files
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OBJS = _scrsize.o \
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break.o \
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cgetc.o \
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@ -27,7 +39,20 @@ OBJS = _scrsize.o \
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rs232.o \
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tgi_mode_table.o
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all: $(OBJS)
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#--------------------------------------------------------------------------
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# Drivers
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TGIS =
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EMDS = c128-georam.emd c128-reu.emd
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#--------------------------------------------------------------------------
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# Targets
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all: $(OBJS) $(EMDS) $(TGIS)
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../runtime/zeropage.o:
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$(MAKE) -C $(dir $@) $(notdir $@)
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clean:
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@rm -f $(OBJS)
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263
libsrc/c128/c128-georam.s
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263
libsrc/c128/c128-georam.s
Normal file
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@ -0,0 +1,263 @@
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;
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; Extended memory driver for the GEORAM cartridge
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;
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; Ullrich von Bassewitz, 2002-11-29
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;
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.include "zeropage.inc"
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.include "em-kernel.inc"
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.include "em-error.inc"
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.macpack generic
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; ------------------------------------------------------------------------
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; Header. Includes jump table
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.segment "JUMPTABLE"
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; Driver signature
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.byte $65, $6d, $64 ; "emd"
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.byte $00 ; EM API version number
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; Jump table.
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.word INSTALL
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.word DEINSTALL
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.word PAGECOUNT
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.word MAP
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.word COMMIT
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.word COPYFROM
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.word COPYTO
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; ------------------------------------------------------------------------
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; Constants
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GR_WINDOW = $DE00 ; Address of GEORAM window
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GR_PAGE_LO = $DFFE ; Page register low
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GR_PAGE_HI = $DFFF ; Page register high
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; ------------------------------------------------------------------------
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; Data.
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.data
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pagecount: .word 2048 ; Currently fixed
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.code
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; ------------------------------------------------------------------------
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; INSTALL routine. Is called after the driver is loaded into memory. If
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; possible, check if the hardware is present and determine the amount of
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; memory available.
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; Must return an EM_ERR_xx code in a/x.
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;
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INSTALL:
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lda #<EM_ERR_OK
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ldx #>EM_ERR_OK
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rts
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; ------------------------------------------------------------------------
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; DEINSTALL routine. Is called before the driver is removed from memory.
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; Can do cleanup or whatever. Must not return anything.
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;
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DEINSTALL:
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rts
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; ------------------------------------------------------------------------
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; PAGECOUNT: Return the total number of available pages in a/x.
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;
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PAGECOUNT:
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lda pagecount
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ldx pagecount+1
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rts
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; ------------------------------------------------------------------------
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; MAP: Map the page in a/x into memory and return a pointer to the page in
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; a/x. The contents of the currently mapped page (if any) may be discarded
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; by the driver.
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;
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MAP: sta tmp1
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txa
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asl tmp1
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rol a
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asl tmp1
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rol a
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sta GR_PAGE_HI
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lda tmp1
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lsr a
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lsr a
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sta GR_PAGE_LO
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lda #<GR_WINDOW
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ldx #>GR_WINDOW
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; Use the RTS from COMMIT below to save a precious byte of storage
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; ------------------------------------------------------------------------
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; COMMIT: Commit changes in the memory window to extended storage.
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COMMIT: rts
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; ------------------------------------------------------------------------
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; COPYFROM: Copy from extended into linear memory. A pointer to a structure
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; describing the request is passed in a/x.
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; The function must not return anything.
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;
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COPYFROM:
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jsr setup
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; Setup is:
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;
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; - ptr1 contains the struct pointer
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; - ptr2 contains the linear memory buffer
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; - ptr3 contains -(count-1)
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; - tmp1 contains the low page register value
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; - tmp2 contains the high page register value
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; - X contains the page offset
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; - Y contains zero
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jmp @L5
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@L1: lda GR_WINDOW,x
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sta (ptr2),y
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iny
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bne @L2
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inc ptr2+1
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@L2: inx
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beq @L4
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; Bump count and repeat
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@L3: inc ptr3
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bne @L1
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inc ptr3+1
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bne @L1
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rts
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; Bump page register
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@L4: inc tmp1 ; Bump low page register
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bit tmp1 ; Check for overflow in bit 6
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bvc @L6 ; Jump if no overflow
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inc tmp2
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@L5: lda tmp2
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sta GR_PAGE_HI
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@L6: lda tmp1
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sta GR_PAGE_LO
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jmp @L3
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; ------------------------------------------------------------------------
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; COPYTO: Copy from linear into extended memory. A pointer to a structure
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; describing the request is passed in a/x.
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; The function must not return anything.
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;
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COPYTO:
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jsr setup
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; Setup is:
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;
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; - ptr1 contains the struct pointer
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; - ptr2 contains the linear memory buffer
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; - ptr3 contains -(count-1)
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; - tmp1 contains the low page register value
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; - tmp2 contains the high page register value
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; - X contains the page offset
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; - Y contains zero
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jmp @L5
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@L1: lda (ptr2),y
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sta GR_WINDOW,x
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iny
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bne @L2
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inc ptr2+1
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@L2: inx
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beq @L4
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; Bump count and repeat
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@L3: inc ptr3
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bne @L1
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inc ptr3+1
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bne @L1
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rts
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; Bump page register
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@L4: inc tmp1 ; Bump low page register
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bit tmp1 ; Check for overflow in bit 6
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bvc @L6 ; Jump if no overflow
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inc tmp2
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@L5: lda tmp2
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sta GR_PAGE_HI
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@L6: lda tmp1
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sta GR_PAGE_LO
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jmp @L3
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; ------------------------------------------------------------------------
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; Helper function for COPYFROM and COPYTO: Store the pointer to the request
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; structure and prepare data for the copy
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setup: sta ptr1
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stx ptr1+1 ; Save passed pointer
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; Get the page number from the struct and adjust it so that it may be used
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; with the hardware. That is: lower 6 bits in tmp1, high bits in tmp2.
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ldy #EM_COPY_PAGE+1
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lda (ptr1),y
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sta tmp2
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dey
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lda (ptr1),y
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asl a
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rol tmp2
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asl a
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rol tmp2
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lsr a
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lsr a
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sta tmp1
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; Get the buffer pointer into ptr2
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ldy #EM_COPY_BUF
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lda (ptr1),y
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sta ptr2
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iny
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lda (ptr1),y
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sta ptr2+1
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; Get the count, calculate -(count-1) and store it into ptr3
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ldy #EM_COPY_COUNT
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lda (ptr1),y
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eor #$FF
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sta ptr3
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iny
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lda (ptr1),y
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eor #$FF
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sta ptr3+1
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; Get the page offset into X and clear Y
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ldy #EM_COPY_OFFS
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lda (ptr1),y
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tax
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ldy #$00
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; Done
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rts
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224
libsrc/c128/c128-reu.s
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224
libsrc/c128/c128-reu.s
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@ -0,0 +1,224 @@
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;
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; Extended memory driver for the Commodore REU
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;
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; Ullrich von Bassewitz, 2002-11-29
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;
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.include "zeropage.inc"
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.include "em-kernel.inc"
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.include "em-error.inc"
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.macpack generic
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; ------------------------------------------------------------------------
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; Header. Includes jump table
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.segment "JUMPTABLE"
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; Driver signature
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.byte $65, $6d, $64 ; "emd"
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.byte $00 ; EM API version number
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; Jump table.
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.word INSTALL
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.word DEINSTALL
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.word PAGECOUNT
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.word MAP
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.word COMMIT
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.word COPYFROM
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.word COPYTO
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; ------------------------------------------------------------------------
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; Constants
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REU_STATUS = $DF00 ; Status register
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REU_COMMAND = $DF01 ; Command register
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REU_C64ADDR = $DF02 ; C64 base address register
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REU_REUADDR = $DF04 ; REU base address register
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REU_COUNT = $DF07 ; Transfer count register
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REU_IRQMASK = $DF09 ; IRQ mask register
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REU_CONTROL = $DF0A ; Control register
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REU_TRIGGER = $FF00 ; REU command trigger
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OP_COPYFROM = $ED
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OP_COPYTO = $EC
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; ------------------------------------------------------------------------
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; Data.
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.data
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pagecount: .res 2 ; Number of pages available
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curpage: .word $FFFF ; Current page number (invalid)
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.bss
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window: .res 256 ; Memory "window"
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reu_params: .word $0000 ; Host address, lo, hi
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.word $0000 ; Exp address, lo, hi
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.byte $00 ; Expansion bank no.
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.word $0000 ; # bytes to move, lo, hi
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.byte $00 ; Interrupt mask reg.
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.byte $00 ; Adress control reg.
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.code
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; ------------------------------------------------------------------------
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; INSTALL routine. Is called after the driver is loaded into memory. If
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; possible, check if the hardware is present and determine the amount of
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; memory available.
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; Must return an EM_ERR_xx code in a/x.
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;
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INSTALL:
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lda #$55
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sta REU_REUADDR
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cmp REU_REUADDR ; Check for presence of REU
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bne nodevice
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lda #$AA
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sta REU_REUADDR
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cmp REU_REUADDR ; Check for presence of REU
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bne nodevice
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ldx #>(128*4) ; Assume 128KB
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lda REU_STATUS
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and #$10 ; Check size bit
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beq @L1
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ldx #>(256*4) ; 256KB when size bit is set
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@L1: stx pagecount+1
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lda #<EM_ERR_OK
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ldx #>EM_ERR_OK
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rts
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; No REU found
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nodevice:
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lda #<EM_ERR_NO_DEVICE
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ldx #>EM_ERR_NO_DEVICE
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rts
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; ------------------------------------------------------------------------
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; DEINSTALL routine. Is called before the driver is removed from memory.
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; Can do cleanup or whatever. Must not return anything.
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;
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DEINSTALL:
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rts
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; ------------------------------------------------------------------------
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; PAGECOUNT: Return the total number of available pages in a/x.
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;
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PAGECOUNT:
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lda pagecount
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ldx pagecount+1
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rts
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; ------------------------------------------------------------------------
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; MAP: Map the page in a/x into memory and return a pointer to the page in
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; a/x. The contents of the currently mapped page (if any) are assumed to be
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; dirty and must be saved into secondary storage if this is necessary.
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;
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MAP: sta curpage
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stx curpage+1 ; Remember the new page
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ldy #OP_COPYFROM
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jsr common ; Copy the window
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lda #<window
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ldx #>window ; Return the window address
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done: rts
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; ------------------------------------------------------------------------
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; COMMIT: Commit changes in the memory window to extended storage.
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COMMIT: lda curpage
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ldx curpage+1 ; Do we have a page mapped?
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bmi done ; Jump if no page mapped
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ldy #OP_COPYTO
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common: sty tmp1
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ldy #<window
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sty REU_C64ADDR
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ldy #>window
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sty REU_C64ADDR+1
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ldy #0
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sty REU_REUADDR+0
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sta REU_REUADDR+1
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stx REU_REUADDR+2
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sty REU_COUNT+0
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ldy #1
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sty REU_COUNT+1 ; Move 256 bytes
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bne transfer1 ; Transfer 256 bytes into REU
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; ------------------------------------------------------------------------
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; COPYFROM: Copy from extended into linear memory. A pointer to a structure
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; describing the request is passed in a/x.
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; The function must not return anything.
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;
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COPYFROM:
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ldy #OP_COPYFROM
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.byte $2C
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; ------------------------------------------------------------------------
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; COPYTO: Copy from linear into extended memory. A pointer to a structure
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; describing the request is passed in a/x.
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; The function must not return anything.
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;
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COPYTO:
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ldy #OP_COPYTO
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sty tmp1
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; Remember the passed pointer
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sta ptr1
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stx ptr1+1 ; Save the pointer
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; The structure passed to the functions has the same layout as the registers
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; of the Commodore REU, so register programming is easy.
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ldy #7-1
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@L1: lda (ptr1),y
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sta REU_C64ADDR,y
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dey
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bpl @L1
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; Invalidate the page in the memory window
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sty curpage+1 ; Y = $FF
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; Reload the REU command and start the transfer
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transfer1:
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ldy tmp1
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; Transfer subroutine for the REU. Expects command in Y.
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transfer:
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sty REU_COMMAND ; Issue command
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ldy $01 ; Save the value of the c64 control port...
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tya ;
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ora #$03 ; Turn on lower 3 bits to bank out ROMs, I/O.
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sei ;
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sta $01
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lda REU_TRIGGER ; Don't change $FF00
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sta REU_TRIGGER ; Start the transfer...
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sty $01 ; Restore the old configuration
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cli
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rts
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