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New extended memory driver contributed by Stefan Haubenthal
git-svn-id: svn://svn.cc65.org/cc65/trunk@2805 b7a2c559-68d2-44c3-8de9-860c34a00d81
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@ -50,6 +50,7 @@ apple2lib:
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$(AR) a apple2.lib $$i/*.o;\
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done
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mv apple2/crt0.o apple2.o
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cp apple2/apple2-lc.emd a2-lc.emd
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cp apple2/apple2-280-192-6.tgi a2-hi.tgi
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cp apple2/apple2-40-40-16.tgi a2-lo.tgi
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cp apple2/apple2-stdjoy.joy a2-stdjoy.joy
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@ -59,6 +59,8 @@ EMDS =
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JOYS = apple2-stdjoy.joy
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SERS = apple2-lc.emd
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TGIS = apple2-40-40-16.tgi apple2-280-192-6.tgi
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#--------------------------------------------------------------------------
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@ -66,14 +68,14 @@ TGIS = apple2-40-40-16.tgi apple2-280-192-6.tgi
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.PHONY: all clean zap
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all: $(OBJS) $(EMDS) $(JOYS) $(TGIS)
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all: $(OBJS) $(EMDS) $(JOYS) $(SERS) $(TGIS)
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../runtime/zeropage.o:
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$(MAKE) -C $(dir $@) $(notdir $@)
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clean:
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@$(RM) $(OBJS) $(EMDS:.emd=.o) $(JOYS:.joy=.o) $(TGIS:.tgi=.o)
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@$(RM) $(OBJS) $(EMDS:.emd=.o) $(JOYS:.joy=.o) $(SERS:.ser=.o) $(TGIS:.tgi=.o)
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zap: clean
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@$(RM) $(EMDS) $(JOYS) $(TGIS)
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@$(RM) $(EMDS) $(JOYS) $(SERS) $(TGIS)
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282
libsrc/apple2/apple2-lc.s
Normal file
282
libsrc/apple2/apple2-lc.s
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@ -0,0 +1,282 @@
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;
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; Extended memory driver for the Apple II language card
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;
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; Stefan Haubenthal, 2003-12-13
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; Ullrich von Bassewitz, 2002-12-02,2003-12-21
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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 EMD_API_VERSION ; EM API version number
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; Jump table.
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.word INSTALL
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.word UNINSTALL
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.word PAGECOUNT
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.word MAP
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.word USE
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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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BASE = $D000 ; $Cxxx -> $Dxxx bank 1
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BASE2 = $D000
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PAGES = ($10000 - BASE) / 256
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ROMONLY2= $C082
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LC2RW = $C083
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LC1RW = $C08B
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; ------------------------------------------------------------------------
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; Data.
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.bss
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curpage: .res 1 ; Current page number
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.bss
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window: .res 256 ; Memory "window"
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.code
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; ------------------------------------------------------------------------
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; INSTALL routine. Is called after the driver is loaded into memory. If
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; possible, check if the hardware is present and determine the amount of
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; memory available.
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; Must return an EM_ERR_xx code in a/x.
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;
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INSTALL:
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lda #$FF
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sta curpage ; Invalidate the current page
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lda #EM_ERR_OK
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ldx #0
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; rts ; Run into UNINSTALL instead
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; ------------------------------------------------------------------------
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; UNINSTALL 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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UNINSTALL:
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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 #<PAGES
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ldx #>PAGES
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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 curpage ; Remember the new page
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add #>BASE
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sta ptr1+1
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ldy #$00
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sty ptr1
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lda #<window
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sta ptr2
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lda #>window
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sta ptr2+1
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; Transfer one page
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jsr transfer ; Transfer one page
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; Return the memory window
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lda #<window
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ldx #>window ; Return the window address
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rts
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; ------------------------------------------------------------------------
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; USE: Tell the driver that the window is now associated with a given page.
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USE: sta curpage ; Remember the page
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lda #<window
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ldx #>window ; Return the window
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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 ; Get the current page
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bmi done ; Jump if no page mapped
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add #>BASE
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sta ptr2+1
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ldy #$00
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sty ptr2
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lda #<window
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sta ptr1
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lda #>window
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sta ptr1+1
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; Transfer one page. Y must be zero on entry
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transfer:
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ldx #0
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lda ptr2+1
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cmp #>BASE
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bcc @L1
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cmp #>BASE2
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bcs @L1
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adc #>(BASE2-BASE)
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sta ptr2+1
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ldx #LC1RW-LC2RW
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@L1: lda ptr1+1
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cmp #>BASE
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bcc @L2
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cmp #>BASE2
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bcs @L2
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adc #>(BASE2-BASE)
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sta ptr1+1
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ldx #LC1RW-LC2RW
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@L2: sei
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lda LC2RW,x ; Bank out ROMs
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lda LC2RW,x
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; Unroll the following loop
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loop: .repeat 8
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lda (ptr1),y
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sta (ptr2),y
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iny
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.endrep
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bne loop
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; Restore the old memory configuration, allow interrupts
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lda ROMONLY2 ; Bank in ROMs
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cli
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; Done
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done: 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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sta ptr3
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stx ptr3+1 ; Save the passed em_copy pointer
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ldy #EM_COPY::OFFS
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lda (ptr3),y
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sta ptr1
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ldy #EM_COPY::PAGE
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lda (ptr3),y
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add #>BASE
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sta ptr1+1 ; From
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ldy #EM_COPY::BUF
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lda (ptr3),y
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sta ptr2
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iny
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lda (ptr3),y
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sta ptr2+1 ; To
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common: ldy #EM_COPY::COUNT+1
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lda (ptr3),y ; Get number of pages
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beq @L2 ; Skip if no full pages
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sta tmp1
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; Copy full pages allowing interrupts after each page copied
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ldy #$00
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@L1: jsr transfer
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inc ptr1+1
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inc ptr2+1
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dec tmp1
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bne @L1
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; Copy the remainder of the page
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@L2: ldy #EM_COPY::COUNT
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lda (ptr3),y ; Get bytes in last page
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beq @L4
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pha
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sei
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lda LC2RW,x ; Bank out ROMs
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lda LC2RW,x
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pla
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tax
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; Transfer the bytes in the last page
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ldy #$00
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@L3: lda (ptr1),y
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sta (ptr2),y
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iny
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dex
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bne @L3
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; Restore the old memory configuration, allow interrupts
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lda ROMONLY2 ; Bank in ROMs
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cli
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; Done
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@L4: rts
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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: sta ptr3
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stx ptr3+1 ; Save the passed em_copy pointer
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ldy #EM_COPY::OFFS
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lda (ptr3),y
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sta ptr2
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ldy #EM_COPY::PAGE
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lda (ptr3),y
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add #>BASE
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sta ptr2+1 ; To
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ldy #EM_COPY::BUF
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lda (ptr3),y
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sta ptr1
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iny
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lda (ptr3),y
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sta ptr1+1 ; From
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jmp common
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@ -109,13 +109,14 @@ programs for the Apple ][ using the cc65 crosscompiler.
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%files apple2
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%attr(644,root,root) /usr/lib/cc65/lib/apple2.lib
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%attr(644,root,root) /usr/lib/cc65/lib/apple2.o
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%attr(644,root,root) /usr/lib/cc65/emd/a2-*.emd
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%attr(644,root,root) /usr/lib/cc65/joy/a2-*.joy
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%attr(644,root,root) /usr/lib/cc65/tgi/a2-*.tgi
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###############################################################################
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# Atari subpackage #
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# Atari subpackage #
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###############################################################################
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%package atari
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