Replaced whole bunch for Makefiles with a single generic Makefile.
- No complex shell logic. - "Source file shadowing" for all targets via vpath. - Dependency handling. - True incremental build. - Don't write into source directories. - Easy cleanup by just removing 'wrk'.
This commit is contained in:
Oliver Schmidt
426
libsrc/c128/emd/c128-ram2.s
Normal file
426
libsrc/c128/emd/c128-ram2.s
Normal file
@@ -0,0 +1,426 @@
|
||||
;
|
||||
; Extended memory driver for the C128 RAM in banks #1, #2 and #3. Driver works without
|
||||
; problems when statically linked.
|
||||
;
|
||||
; Ullrich von Bassewitz, 2002-12-04
|
||||
;
|
||||
; Updated to use banks 2 and 3 as well by
|
||||
; Marco van den Heuvel, 2010-01-21
|
||||
;
|
||||
|
||||
.include "zeropage.inc"
|
||||
|
||||
.include "em-kernel.inc"
|
||||
.include "em-error.inc"
|
||||
.include "c128.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
|
||||
|
||||
BASE = $400
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; Data.
|
||||
|
||||
.bss
|
||||
curpage: .res 2 ; Current page number
|
||||
curbank: .res 1 ; Current bank number
|
||||
copybank: .res 2 ; temp bank number
|
||||
|
||||
window: .res 256 ; Memory "window"
|
||||
|
||||
pagecount: .res 2 ; Number of available pages
|
||||
|
||||
.code
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; INSTALL routine. Is called after the driver is loaded into memory. If
|
||||
; possible, check if the hardware is present and determine the amount of
|
||||
; memory available.
|
||||
; Must return an EM_ERR_xx code in a/x.
|
||||
;
|
||||
|
||||
INSTALL:
|
||||
ldx #0
|
||||
stx ptr1
|
||||
ldx #4
|
||||
stx ptr1+1
|
||||
ldx #<ptr1
|
||||
stx FETVEC
|
||||
stx STAVEC
|
||||
ldy #0
|
||||
ldx #MMU_CFG_RAM1
|
||||
jsr FETCH
|
||||
sta tmp1
|
||||
ldx #MMU_CFG_RAM3
|
||||
jsr FETCH
|
||||
cmp tmp1
|
||||
bne @has_4_banks
|
||||
tax
|
||||
inx
|
||||
txa
|
||||
ldx #MMU_CFG_RAM1
|
||||
jsr STASH
|
||||
ldx #MMU_CFG_RAM3
|
||||
jsr FETCH
|
||||
cmp tmp1
|
||||
beq @has_4_banks
|
||||
ldx #0
|
||||
lda #251
|
||||
bne @setok
|
||||
|
||||
@has_4_banks:
|
||||
ldx #2
|
||||
lda #241
|
||||
@setok:
|
||||
sta pagecount
|
||||
stx pagecount+1
|
||||
ldx #$FF
|
||||
stx curpage
|
||||
stx curpage+1 ; Invalidate the current page
|
||||
inx
|
||||
txa ; A = X = 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 pagecount
|
||||
ldx pagecount+1
|
||||
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: sei
|
||||
sta curpage
|
||||
stx curpage+1 ; Remember the new page
|
||||
|
||||
jsr calculate_bank_and_correct_page
|
||||
stx curbank
|
||||
|
||||
clc
|
||||
adc #>BASE
|
||||
sta ptr1+1
|
||||
ldy #$00
|
||||
sty ptr1
|
||||
lda #<ptr1
|
||||
sta FETVEC
|
||||
|
||||
; Transfer one page
|
||||
|
||||
@L1: ldx curbank
|
||||
jsr getcurbankmmu
|
||||
jsr FETCH
|
||||
sta window,y
|
||||
iny
|
||||
bne @L1
|
||||
|
||||
; Return the memory window
|
||||
|
||||
lda #<window
|
||||
ldx #>window ; Return the window address
|
||||
cli
|
||||
rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; USE: Tell the driver that the window is now associated with a given page.
|
||||
|
||||
USE: sta curpage
|
||||
stx curpage+1 ; Remember the page
|
||||
lda #<window
|
||||
ldx #>window ; Return the window
|
||||
rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; COMMIT: Commit changes in the memory window to extended storage.
|
||||
|
||||
COMMIT: sei
|
||||
lda curpage ; Get the current page
|
||||
ldx curpage+1
|
||||
bmi done ; Jump if no page mapped
|
||||
|
||||
jsr calculate_bank_and_correct_page
|
||||
stx curbank
|
||||
|
||||
clc
|
||||
adc #>BASE
|
||||
sta ptr1+1
|
||||
ldy #$00
|
||||
sty ptr1
|
||||
|
||||
lda #<ptr1
|
||||
sta STAVEC
|
||||
|
||||
; Transfer one page. Y must be zero on entry
|
||||
|
||||
@L1: lda window,y
|
||||
ldx curbank
|
||||
jsr getcurbankmmu
|
||||
jsr STASH
|
||||
iny
|
||||
bne @L1
|
||||
cli
|
||||
|
||||
; Done
|
||||
|
||||
done: rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; COPYFROM: Copy from extended into linear memory. A pointer to a structure
|
||||
; describing the request is passed in a/x.
|
||||
; The function must not return anything.
|
||||
;
|
||||
|
||||
COPYFROM:
|
||||
sei
|
||||
jsr setup
|
||||
|
||||
; Setup is:
|
||||
;
|
||||
; - ptr1 contains the struct pointer
|
||||
; - ptr2 contains the linear memory buffer
|
||||
; - ptr3 contains -(count-1)
|
||||
; - ptr4 contains the page buffer and offset
|
||||
; - tmp1 contains the bank
|
||||
; - tmp2 contains zero (used for linear memory buffer offset)
|
||||
|
||||
lda #<ptr4
|
||||
sta FETVEC
|
||||
jmp @L3
|
||||
|
||||
@L1: ldx tmp1
|
||||
jsr getcurbankmmu
|
||||
ldy #0
|
||||
jsr FETCH
|
||||
ldy tmp2
|
||||
sta (ptr2),y
|
||||
inc tmp2
|
||||
bne @L2
|
||||
inc ptr2+1
|
||||
@L2: inc ptr4
|
||||
beq @L4
|
||||
|
||||
; Bump count and repeat
|
||||
|
||||
@L3: inc ptr3
|
||||
bne @L1
|
||||
inc ptr3+1
|
||||
bne @L1
|
||||
cli
|
||||
rts
|
||||
|
||||
; Bump page register
|
||||
|
||||
@L4: inc ptr4+1
|
||||
lda ptr4+1
|
||||
cmp #$ff
|
||||
bne @L3
|
||||
lda #4
|
||||
sta ptr4+1
|
||||
inc tmp1
|
||||
@L5:
|
||||
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:
|
||||
sei
|
||||
jsr setup
|
||||
|
||||
; Setup is:
|
||||
;
|
||||
; - ptr1 contains the struct pointer
|
||||
; - ptr2 contains the linear memory buffer
|
||||
; - ptr3 contains -(count-1)
|
||||
; - ptr4 contains the page buffer and offset
|
||||
; - tmp1 contains the bank
|
||||
; - tmp2 contains zero (used for linear memory buffer offset)
|
||||
|
||||
lda #<ptr4
|
||||
sta STAVEC
|
||||
jmp @L3
|
||||
|
||||
@L1:
|
||||
ldy tmp2
|
||||
lda (ptr2),y
|
||||
ldx tmp1
|
||||
jsr getcurbankmmu
|
||||
ldy #0
|
||||
jsr STASH
|
||||
inc tmp2
|
||||
bne @L2
|
||||
inc ptr2+1
|
||||
@L2: inc ptr4
|
||||
beq @L4
|
||||
|
||||
; Bump count and repeat
|
||||
|
||||
@L3: inc ptr3
|
||||
bne @L1
|
||||
inc ptr3+1
|
||||
bne @L1
|
||||
cli
|
||||
rts
|
||||
|
||||
; Bump page register
|
||||
|
||||
@L4: inc ptr4+1
|
||||
lda ptr4+1
|
||||
cmp #$ff
|
||||
bne @L3
|
||||
inc tmp1
|
||||
lda #4
|
||||
sta ptr4+1
|
||||
@L5:
|
||||
jmp @L3
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; Helper function to calculate the correct bank and page
|
||||
; when addressing bank 2 or 3
|
||||
|
||||
calculate_bank_and_correct_page:
|
||||
cpx #2
|
||||
beq @calculate_bank_3_with_2
|
||||
cpx #1
|
||||
beq @calculate_bank_2_or_3_with_1
|
||||
sec
|
||||
sbc #251
|
||||
bcs @calculate_bank_2_with_0
|
||||
ldx #1
|
||||
lda curpage
|
||||
rts
|
||||
|
||||
@calculate_bank_3_with_2:
|
||||
lda curpage
|
||||
clc
|
||||
adc #10
|
||||
@calculate_bank_3_with_1:
|
||||
ldx #3
|
||||
rts
|
||||
|
||||
@calculate_bank_2_or_3_with_1:
|
||||
sec
|
||||
sbc #246
|
||||
bcs @calculate_bank_3_with_1
|
||||
lda curpage
|
||||
clc
|
||||
adc #5
|
||||
@calculate_bank_2_with_0:
|
||||
ldx #2
|
||||
rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; Helper function to get the correct mmu value in x
|
||||
|
||||
getcurbankmmu:
|
||||
cpx #1
|
||||
beq @bank1
|
||||
cpx #2
|
||||
beq @bank2
|
||||
ldx #MMU_CFG_RAM3
|
||||
rts
|
||||
@bank2:
|
||||
ldx #MMU_CFG_RAM2
|
||||
rts
|
||||
@bank1:
|
||||
ldx #MMU_CFG_RAM1
|
||||
rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; 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 adjust it so that it may be used
|
||||
; with the hardware. That is: page pointer in ptr4 and bank in tmp1
|
||||
|
||||
ldy #EM_COPY::PAGE+1
|
||||
lda (ptr1),y
|
||||
tax
|
||||
dey
|
||||
lda (ptr1),y
|
||||
sta curpage
|
||||
jsr calculate_bank_and_correct_page
|
||||
clc
|
||||
adc #4
|
||||
sta ptr4+1
|
||||
stx 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 the low byte of ptr4 clear tmp2
|
||||
|
||||
ldy #EM_COPY::OFFS
|
||||
lda (ptr1),y
|
||||
sta ptr4
|
||||
lda #0
|
||||
sta tmp2
|
||||
|
||||
; Done
|
||||
|
||||
rts
|
||||
Reference in New Issue
Block a user