mirror of
https://github.com/cc65/cc65.git
synced 2024-06-01 13:41:34 +00:00
New EMD driver for the ISEPIC cartridge written and contributed by
Marco van den Heuvel with some cleanup by me. git-svn-id: svn://svn.cc65.org/cc65/trunk@4574 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
uz
parent
31819685af
commit
4e18dad55a
|
|
@ -71,15 +71,26 @@ OBJS = _scrsize.o \
|
|||
#--------------------------------------------------------------------------
|
||||
# Drivers
|
||||
|
||||
EMDS = c64-georam.emd c64-ram.emd c64-ramcart.emd c64-reu.emd c64-vdc.emd dtv-himem.emd
|
||||
EMDS = c64-georam.emd \
|
||||
c64-isepic.emd \
|
||||
c64-ram.emd \
|
||||
c64-ramcart.emd \
|
||||
c64-reu.emd \
|
||||
c64-vdc.emd \
|
||||
dtv-himem.emd
|
||||
|
||||
JOYS = c64-hitjoy.joy c64-numpad.joy c64-ptvjoy.joy c64-stdjoy.joy
|
||||
JOYS = c64-hitjoy.joy \
|
||||
c64-numpad.joy \
|
||||
c64-ptvjoy.joy \
|
||||
c64-stdjoy.joy
|
||||
|
||||
MOUS = c64-1351.mou c64-joymouse.mou c64-potmouse.mou
|
||||
MOUS = c64-1351.mou \
|
||||
c64-joymouse.mou \
|
||||
c64-potmouse.mou
|
||||
|
||||
SERS = c64-swlink.ser
|
||||
SERS = c64-swlink.ser
|
||||
|
||||
TGIS = c64-320-200-2.tgi
|
||||
TGIS = c64-320-200-2.tgi
|
||||
|
||||
#--------------------------------------------------------------------------
|
||||
# Targets
|
||||
|
|
|
|||
270
libsrc/c64/c64-isepic.s
Executable file
270
libsrc/c64/c64-isepic.s
Executable file
|
|
@ -0,0 +1,270 @@
|
|||
;
|
||||
; Extended memory driver for the ISEPIC cartridge.
|
||||
; Marco van den Heuvel, 2010-01-24
|
||||
;
|
||||
|
||||
.include "zeropage.inc"
|
||||
|
||||
.include "em-kernel.inc"
|
||||
.include "em-error.inc"
|
||||
|
||||
|
||||
.macpack generic
|
||||
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; Header. Includes jump table
|
||||
|
||||
.segment "JUMPTABLE"
|
||||
|
||||
; Driver signature
|
||||
|
||||
.byte $65, $6d, $64 ; "emd"
|
||||
.byte EMD_API_VERSION ; EM API version number
|
||||
|
||||
; Jump table.
|
||||
|
||||
.word INSTALL
|
||||
.word UNINSTALL
|
||||
.word PAGECOUNT
|
||||
.word MAP
|
||||
.word USE
|
||||
.word COMMIT
|
||||
.word COPYFROM
|
||||
.word COPYTO
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; Constants
|
||||
|
||||
IP_WINDOW = $DF00 ; Address of ISEPIC window
|
||||
IP_CTRL_BASE = $DE00
|
||||
PAGES = 8
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; Code.
|
||||
|
||||
.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:
|
||||
lda #0
|
||||
sta IP_CTRL_BASE
|
||||
ldx IP_WINDOW
|
||||
cpx IP_WINDOW
|
||||
bne @notpresent
|
||||
inc IP_WINDOW
|
||||
cpx IP_WINDOW
|
||||
beq @notpresent
|
||||
ldx IP_WINDOW
|
||||
sta IP_CTRL_BASE+1
|
||||
inx
|
||||
stx IP_WINDOW
|
||||
dex
|
||||
sta IP_CTRL_BASE
|
||||
cpx IP_WINDOW
|
||||
beq @setok
|
||||
|
||||
@notpresent:
|
||||
lda #<EM_ERR_NO_DEVICE
|
||||
ldx #>EM_ERR_NO_DEVICE
|
||||
rts
|
||||
|
||||
@setok:
|
||||
lda #<EM_ERR_OK
|
||||
ldx #>EM_ERR_OK
|
||||
; 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 #>PAGES
|
||||
rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; USE: Tell the driver that the window is now associated with a given page.
|
||||
; The Isepic cartridge does not copy but actually map the window, so USE is
|
||||
; identical to MAP.
|
||||
|
||||
USE := MAP
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; 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:
|
||||
tax
|
||||
sta IP_CTRL_BASE,x
|
||||
lda #<IP_WINDOW
|
||||
ldx #>IP_WINDOW
|
||||
|
||||
; Use the RTS from COMMIT below to save a precious byte of storage
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; COMMIT: Commit changes in the memory window to extended storage.
|
||||
|
||||
COMMIT:
|
||||
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:
|
||||
jsr setup
|
||||
|
||||
; Setup is:
|
||||
;
|
||||
; - ptr1 contains the struct pointer
|
||||
; - ptr2 contains the linear memory buffer
|
||||
; - ptr3 contains -(count-1)
|
||||
; - tmp1 contains the low page register value
|
||||
; - X contains the page offset
|
||||
; - Y contains zero
|
||||
|
||||
jmp @L5
|
||||
|
||||
@L1:
|
||||
lda IP_WINDOW,x
|
||||
sta (ptr2),y
|
||||
iny
|
||||
bne @L2
|
||||
inc ptr2+1
|
||||
@L2:
|
||||
inx
|
||||
beq @L4
|
||||
|
||||
; Bump count and repeat
|
||||
|
||||
@L3:
|
||||
inc ptr3
|
||||
bne @L1
|
||||
inc ptr3+1
|
||||
bne @L1
|
||||
rts
|
||||
|
||||
; Bump page register
|
||||
|
||||
@L4:
|
||||
inc tmp1 ; Bump low page register
|
||||
@L5:
|
||||
stx tmp2
|
||||
ldx tmp1
|
||||
sta IP_CTRL_BASE,x
|
||||
ldx tmp2
|
||||
jmp @L3
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; 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:
|
||||
jsr setup
|
||||
|
||||
; Setup is:
|
||||
;
|
||||
; - ptr1 contains the struct pointer
|
||||
; - ptr2 contains the linear memory buffer
|
||||
; - ptr3 contains -(count-1)
|
||||
; - tmp1 contains the low page register value
|
||||
; - X contains the page offset
|
||||
; - Y contains zero
|
||||
|
||||
jmp @L5
|
||||
|
||||
@L1:
|
||||
lda (ptr2),y
|
||||
sta IP_WINDOW,x
|
||||
iny
|
||||
bne @L2
|
||||
inc ptr2+1
|
||||
@L2:
|
||||
inx
|
||||
beq @L4
|
||||
|
||||
; Bump count and repeat
|
||||
|
||||
@L3:
|
||||
inc ptr3
|
||||
bne @L1
|
||||
inc ptr3+1
|
||||
bne @L1
|
||||
rts
|
||||
|
||||
; Bump page register
|
||||
|
||||
@L4:
|
||||
inc tmp1 ; Bump page register
|
||||
@L5:
|
||||
stx tmp2
|
||||
ldx tmp1
|
||||
sta IP_CTRL_BASE,x
|
||||
ldx tmp2
|
||||
jmp @L3
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; Helper function for COPYFROM and COPYTO: Store the pointer to the request
|
||||
; structure and prepare data for the copy
|
||||
|
||||
setup:
|
||||
sta ptr1
|
||||
stx ptr1+1 ; Save passed pointer
|
||||
|
||||
; Get the page number from the struct and remember it.
|
||||
|
||||
ldy #EM_COPY::PAGE
|
||||
lda (ptr1),y
|
||||
sta tmp1
|
||||
|
||||
; Get the buffer pointer into ptr2
|
||||
|
||||
ldy #EM_COPY::BUF
|
||||
lda (ptr1),y
|
||||
sta ptr2
|
||||
iny
|
||||
lda (ptr1),y
|
||||
sta ptr2+1
|
||||
|
||||
; Get the count, calculate -(count-1) and store it into ptr3
|
||||
|
||||
ldy #EM_COPY::COUNT
|
||||
lda (ptr1),y
|
||||
eor #$FF
|
||||
sta ptr3
|
||||
iny
|
||||
lda (ptr1),y
|
||||
eor #$FF
|
||||
sta ptr3+1
|
||||
|
||||
; Get the page offset into X and clear Y
|
||||
|
||||
ldy #EM_COPY::OFFS
|
||||
lda (ptr1),y
|
||||
tax
|
||||
ldy #0
|
||||
|
||||
; Done
|
||||
|
||||
rts
|
||||
Loading…
Reference in New Issue
Block a user