mirror of
https://github.com/cc65/cc65.git
synced 2024-12-25 17:29:50 +00:00
New EM driver for the C16
git-svn-id: svn://svn.cc65.org/cc65/trunk@2762 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz
parent
d19a31626c
commit
1c6de7dab2
@ -99,6 +99,7 @@ c16lib:
|
||||
done
|
||||
mv c16/crt0.o c16.o
|
||||
cp c16/*.joy .
|
||||
cp c16/*.emd .
|
||||
|
||||
#-----------------------------------------------------------------------------
|
||||
# C64
|
||||
|
||||
@ -20,6 +20,9 @@
|
||||
%.joy: %.o ../runtime/zeropage.o
|
||||
@$(LD) -t module -o $@ $^
|
||||
|
||||
%.ser: %.o ../runtime/zeropage.o
|
||||
@$(LD) -t module -o $@ $^
|
||||
|
||||
%.tgi: %.o ../runtime/zeropage.o
|
||||
@$(LD) -t module -o $@ $^
|
||||
|
||||
@ -46,10 +49,12 @@ OBJS = _scrsize.o \
|
||||
#--------------------------------------------------------------------------
|
||||
# Drivers
|
||||
|
||||
EMDS =
|
||||
EMDS = c16-ram.emd
|
||||
|
||||
JOYS = c16-stdjoy.joy
|
||||
|
||||
SERS =
|
||||
|
||||
TGIS =
|
||||
|
||||
#--------------------------------------------------------------------------
|
||||
@ -57,14 +62,14 @@ TGIS =
|
||||
|
||||
.PHONY: all clean zap
|
||||
|
||||
all: $(OBJS) $(EMDS) $(JOYS) $(TGIS)
|
||||
all: $(OBJS) $(EMDS) $(JOYS) $(SERS) $(TGIS)
|
||||
|
||||
../runtime/zeropage.o:
|
||||
$(MAKE) -C $(dir $@) $(notdir $@)
|
||||
|
||||
clean:
|
||||
@$(RM) $(OBJS) $(EMDS:.emd=.o) $(JOYS:.joy=.o) $(TGIS:.tgi=.o)
|
||||
@$(RM) $(OBJS) $(EMDS:.emd=.o) $(JOYS:.joy=.o) $(SERS:.ser=.o) $(TGIS:.tgi=.o)
|
||||
|
||||
zap: clean
|
||||
@$(RM) $(EMDS) $(JOYS) $(TGIS)
|
||||
@$(RM) $(EMDS) $(JOYS) $(SERS) $(TGIS)
|
||||
|
||||
|
||||
295
libsrc/c16/c16-ram.s
Normal file
295
libsrc/c16/c16-ram.s
Normal file
@ -0,0 +1,295 @@
|
||||
;
|
||||
; Extended memory driver for the C16 hidden RAM. Driver works without
|
||||
; problems when statically linked.
|
||||
;
|
||||
; Ullrich von Bassewitz, 2003-12-15
|
||||
;
|
||||
|
||||
.include "zeropage.inc"
|
||||
|
||||
.include "em-kernel.inc"
|
||||
.include "em-error.inc"
|
||||
.include "../plus4/plus4.inc"
|
||||
|
||||
.macpack generic
|
||||
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; Header. Includes jump table
|
||||
|
||||
.segment "JUMPTABLE"
|
||||
|
||||
; Driver signature
|
||||
|
||||
.byte $65, $6d, $64 ; "emd"
|
||||
.byte $00 ; EM API version number
|
||||
|
||||
; Jump table.
|
||||
|
||||
.word INSTALL
|
||||
.word UNINSTALL
|
||||
.word PAGECOUNT
|
||||
.word MAP
|
||||
.word USE
|
||||
.word COMMIT
|
||||
.word COPYFROM
|
||||
.word COPYTO
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; Constants
|
||||
|
||||
BASE = $8000
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; Data.
|
||||
|
||||
.bss
|
||||
pages: .res 1 ; Number of pages
|
||||
curpage: .res 1 ; Current page number
|
||||
window: .res 256 ; Memory "window"
|
||||
|
||||
.code
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; INSTALL routine. Is called after the driver is loaded into memory. If
|
||||
; possible, check if the hardware is present and determine the amount of
|
||||
; memory available.
|
||||
; Must return an EM_ERR_xx code in a/x.
|
||||
;
|
||||
|
||||
INSTALL:
|
||||
|
||||
; Determine how much memory is available. We will use all memory above
|
||||
; $8000 up to MEMTOP
|
||||
|
||||
sec
|
||||
jsr $FF99 ; MEMTOP: Get top memory into Y/X
|
||||
tya
|
||||
sub #>BASE ; Low 32 K are used
|
||||
bcc nomem
|
||||
beq nomem ; Offering zero pages is a bad idea
|
||||
sta pages
|
||||
|
||||
ldx #$FF
|
||||
stx curpage ; Invalidate the current page
|
||||
inx ; X = 0
|
||||
txa ; A = X = EM_ERR_OK
|
||||
rts
|
||||
|
||||
nomem: ldx #>EM_ERR_NO_DEVICE
|
||||
lda #<EM_ERR_NO_DEVICE
|
||||
; rts ; Run into UNINSTALL instead
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; UNINSTALL routine. Is called before the driver is removed from memory.
|
||||
; Can do cleanup or whatever. Must not return anything.
|
||||
;
|
||||
|
||||
UNINSTALL:
|
||||
rts
|
||||
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; PAGECOUNT: Return the total number of available pages in a/x.
|
||||
;
|
||||
|
||||
PAGECOUNT:
|
||||
lda pages
|
||||
ldx #$00 ; 128 pages max
|
||||
rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; MAP: Map the page in a/x into memory and return a pointer to the page in
|
||||
; a/x. The contents of the currently mapped page (if any) may be discarded
|
||||
; by the driver.
|
||||
;
|
||||
|
||||
MAP: sta curpage ; Remember the new page
|
||||
|
||||
add #>BASE
|
||||
sta ptr1+1
|
||||
ldy #$00
|
||||
sty ptr1
|
||||
|
||||
lda #<window
|
||||
sta ptr2
|
||||
lda #>window
|
||||
sta ptr2+1
|
||||
|
||||
; Transfer one page
|
||||
|
||||
jsr transfer ; Transfer one page
|
||||
|
||||
; Return the memory window
|
||||
|
||||
lda #<window
|
||||
ldx #>window ; Return the window address
|
||||
rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; USE: Tell the driver that the window is now associated with a given page.
|
||||
|
||||
USE: sta curpage ; Remember the page
|
||||
lda #<window
|
||||
ldx #>window ; Return the window
|
||||
rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; COMMIT: Commit changes in the memory window to extended storage.
|
||||
|
||||
COMMIT: lda curpage ; Get the current page
|
||||
bmi done ; Jump if no page mapped
|
||||
|
||||
add #>BASE
|
||||
sta ptr2+1
|
||||
ldy #$00
|
||||
sty ptr2
|
||||
|
||||
lda #<window
|
||||
sta ptr1
|
||||
lda #>window
|
||||
sta ptr1+1
|
||||
|
||||
; Transfer one page. Y must be zero on entry. Because we bank out the
|
||||
; kernal, we will run the routine with interrupts disabled but leave
|
||||
; short breath times. Unroll the following loop to make it somewhat faster.
|
||||
|
||||
transfer:
|
||||
sei
|
||||
sta ENABLE_RAM
|
||||
|
||||
lda (ptr1),y
|
||||
sta (ptr2),y
|
||||
iny
|
||||
|
||||
lda (ptr1),y
|
||||
sta (ptr2),y
|
||||
iny
|
||||
|
||||
lda (ptr1),y
|
||||
sta (ptr2),y
|
||||
iny
|
||||
|
||||
lda (ptr1),y
|
||||
sta (ptr2),y
|
||||
iny
|
||||
|
||||
lda (ptr1),y
|
||||
sta (ptr2),y
|
||||
iny
|
||||
|
||||
lda (ptr1),y
|
||||
sta (ptr2),y
|
||||
iny
|
||||
|
||||
lda (ptr1),y
|
||||
sta (ptr2),y
|
||||
iny
|
||||
|
||||
lda (ptr1),y
|
||||
sta (ptr2),y
|
||||
iny
|
||||
|
||||
sta ENABLE_ROM
|
||||
cli
|
||||
|
||||
bne transfer
|
||||
|
||||
; Done
|
||||
|
||||
done: rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; COPYFROM: Copy from extended into linear memory. A pointer to a structure
|
||||
; describing the request is passed in a/x.
|
||||
; The function must not return anything.
|
||||
;
|
||||
|
||||
COPYFROM:
|
||||
sta ptr3
|
||||
stx ptr3+1 ; Save the passed em_copy pointer
|
||||
|
||||
ldy #EM_COPY_OFFS
|
||||
lda (ptr3),y
|
||||
sta ptr1
|
||||
ldy #EM_COPY_PAGE
|
||||
lda (ptr3),y
|
||||
add #>BASE
|
||||
sta ptr1+1 ; From
|
||||
|
||||
ldy #EM_COPY_BUF
|
||||
lda (ptr3),y
|
||||
sta ptr2
|
||||
iny
|
||||
lda (ptr3),y
|
||||
sta ptr2+1 ; To
|
||||
|
||||
common: ldy #EM_COPY_COUNT+1
|
||||
lda (ptr3),y ; Get number of pages
|
||||
beq @L2 ; Skip if no full pages
|
||||
sta tmp1
|
||||
|
||||
; Copy full pages allowing interrupts after each page copied
|
||||
|
||||
ldy #$00
|
||||
@L1: jsr transfer
|
||||
inc ptr1+1
|
||||
inc ptr2+1
|
||||
dec tmp1
|
||||
bne @L1
|
||||
|
||||
; Copy the remainder of the page
|
||||
|
||||
@L2: ldy #EM_COPY_COUNT
|
||||
lda (ptr3),y ; Get bytes in last page
|
||||
beq @L4
|
||||
tax
|
||||
|
||||
sei ; Disable ints
|
||||
sta ENABLE_RAM ; Bank out the ROM
|
||||
|
||||
; Transfer the bytes in the last page
|
||||
|
||||
ldy #$00
|
||||
@L3: lda (ptr1),y
|
||||
sta (ptr2),y
|
||||
iny
|
||||
dex
|
||||
bne @L3
|
||||
|
||||
; Restore the old memory configuration, allow interrupts
|
||||
|
||||
sta ENABLE_ROM
|
||||
cli
|
||||
|
||||
; Done
|
||||
|
||||
@L4: rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; COPYTO: Copy from linear into extended memory. A pointer to a structure
|
||||
; describing the request is passed in a/x.
|
||||
; The function must not return anything.
|
||||
;
|
||||
|
||||
COPYTO: sta ptr3
|
||||
stx ptr3+1 ; Save the passed em_copy pointer
|
||||
|
||||
ldy #EM_COPY_OFFS
|
||||
lda (ptr3),y
|
||||
sta ptr2
|
||||
ldy #EM_COPY_PAGE
|
||||
lda (ptr3),y
|
||||
add #>BASE
|
||||
sta ptr2+1 ; To
|
||||
|
||||
ldy #EM_COPY_BUF
|
||||
lda (ptr3),y
|
||||
sta ptr1
|
||||
iny
|
||||
lda (ptr3),y
|
||||
sta ptr1+1 ; From
|
||||
|
||||
jmp common
|
||||
|
||||
|
||||
@ -195,6 +195,7 @@ programs for the Commodore C16/116 using the cc65 crosscompiler.
|
||||
%files c16
|
||||
%attr(644,root,root) /usr/lib/cc65/lib/c16.lib
|
||||
%attr(644,root,root) /usr/lib/cc65/lib/c16.o
|
||||
%attr(644,root,root) /usr/lib/cc65/emd/c16-*.emd
|
||||
%attr(644,root,root) /usr/lib/cc65/joy/c16-*.joy
|
||||
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user