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some cleanup

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mrdudz
2022-07-21 03:43:54 +02:00
parent a55807f682
commit 86091ac6bf
1 changed files with 112 additions and 91 deletions
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203
libsrc/c64/emd/c64-rrr.s
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@@ -3,49 +3,67 @@
;should work for ActionReplay as well... ;should work for ActionReplay as well...
; ;
; ;
;Version 1.0 ; original Version 1.0 by Johannes Braun 2006-08-22 <hannenz@freenet.de>
;
;Johannes Braun 2006-08-22
;hannenz@freenet.de
; ;
;use the functions described in "usr/lib/cc65/include/em.h" to make use of this driver. ;use the functions described in "usr/lib/cc65/include/em.h" to make use of this driver.
;------------------------------------------------------------------------------------------------------------------------- ; ------------------------------------------------------------------------
;NOTE: If called from ROM the Lo_Code routines must exit with LDA #$00 / STA $DE00!!! just change and recompile! ;NOTE: If called from ROM the Lo_Code routines must exit with LDA #$00 / STA $DE00!!! just change and recompile!
.include "em-kernel.inc" .include "zeropage.inc"
.importzp ptr1,ptr2,ptr3,ptr4,tmp1
.macpack generic
c64_ram = ptr1 ;use some more expressive identifiers... .include "em-kernel.inc"
rr_ram = ptr2 .include "em-error.inc"
len = ptr3
aux = ptr4
temp = tmp1
Lo_Mem = $0100 ;location of Lo_Code (must be below $1000 or above $e000) .macpack generic
.macpack module
.segment "JUMPTABLE" ; ------------------------------------------------------------------------
.byte $65,$6d,$64 ;Driver signature c64_ram = ptr1 ; use some more expressive identifiers...
.byte EMD_API_VERSION rr_ram = ptr2
len = ptr3
aux = ptr4
temp = tmp1
.addr INSTALL ;Jump Table Lo_Mem = $0100 ; location of Lo_Code (must be below $1000 or above $e000)
.addr UNINSTALL
.addr PAGECOUNT ; ------------------------------------------------------------------------
.addr MAP ; Header. Includes jump table
.addr USE
.addr COMMIT module_header _c64_rrr_emd
.addr COPYFROM
.addr COPYTO ; Driver signature
.byte $65, $6d, $64 ; "emd"
.byte EMD_API_VERSION ; EM API version number
; Library reference
.addr $0000
; Jump table
.addr INSTALL
.addr UNINSTALL
.addr PAGECOUNT
.addr MAP
.addr USE
.addr COMMIT
.addr COPYFROM
.addr COPYTO
; ------------------------------------------------------------------------
.bss .bss
window: .res 256 ;the memory window (256 bytes) window: .res 256 ; the memory window (256 bytes)
.rodata .rodata
dummy: .word window ;a "pseudo"-em_copy_struct, used by em_map/ em_commit dummy:
.byte 0 ;to pass over to COPYTO/COPYFROM .word window ; a "pseudo"-em_copy_struct, used by em_map/ em_commit
curpage: .byte $ff ;just this byte is changed according to the desired page .byte 0 ; to pass over to COPYTO/COPYFROM
curpage:
.byte $ff ; just this byte is changed according to the desired page
.byte 0 .byte 0
.word 256 .word 256
@@ -61,37 +79,37 @@ INSTALL:
sta Lo_Mem,x sta Lo_Mem,x
dex dex
bpl :- bpl :-
stx curpage ;invalidate current page ($ff) stx curpage ; invalidate current page ($ff)
ldx #$23 ;$de00 value for rr-ram ldx #$23 ; $de00 value for rr-ram
ldy #$02 ;$de00 value for c64-ram, CHANGE TO LDA #$00 if driver is called from ROM! ldy #$02 ; $de00 value for c64-ram, CHANGE TO LDA #$00 if driver is called from ROM!
bne COMMON bne COMMON
c1: stx $de00 ;try accessing rr-ram c1: stx $de00 ; try accessing rr-ram
lda $8888 lda $8888
pha pha
lda $9999 ;remember old content of $8888 and $9999 lda $9999 ; remember old content of $8888 and $9999
pha pha
lda #$55 lda #$55
sta $8888 ;write test values sta $8888 ; write test values
asl asl
sta $9999 sta $9999
sty $de00 ;switch to c64 ram sty $de00 ; switch to c64 ram
stx $8888 stx $8888
stx $9999 stx $9999
stx $de00 ;switch to rr-ram again (if present) stx $de00 ; switch to rr-ram again (if present)
ldx $8888 ;read the values ldx $8888 ; read the values
ldy $9999 ldy $9999
pla pla
sta $9999 ;and write the old values back sta $9999 ; and write the old values back
pla pla
sta $8888 sta $8888
lda #2 lda #2
sta $de00 ;c64 ram again sta $de00 ; c64 ram again
cli cli
cpx #$55 cpx #$55
@@ -100,7 +118,7 @@ c1: stx $de00 ;try accessing rr-ram
bne no bne no
lda #0 lda #0
rts rts
no: asl ;.A still has #2, so return #4: error code for "device not present" no: asl ; A still has #2, so return #4: error code for "device not present"
rts rts
c2: c2:
;---------------------------------------------------------------------------------------- ;----------------------------------------------------------------------------------------
@@ -108,7 +126,8 @@ c2:
;---------------------------------------------------------------------------------------- ;----------------------------------------------------------------------------------------
UNINSTALL: UNINSTALL:
return_null: return_null:
lda #$00 ;always return 32kb (128 pages) lda #$00 ; always return 32kb (128 pages)
; fall through, skip the LDA
.byte $2c .byte $2c
;---------------------------------------------------------------------------------------- ;----------------------------------------------------------------------------------------
@@ -123,12 +142,13 @@ PAGECOUNT:
;void* __fastcall__ em_use(unsigned page); ;void* __fastcall__ em_use(unsigned page);
;---------------------------------------------------------------------------------------- ;----------------------------------------------------------------------------------------
USE: USE:
cmp #$80 ;valid page? cmp #$80 ; valid page?
bcs return_null ;no, return NULL pointer bcs return_null ; no, return NULL pointer
sta curpage ;set to current page sta curpage ; set to current page
return_win: lda #<window ;return pointer to window return_win:
lda #<window ; return pointer to window
ldx #>window ldx #>window
return: rts return: rts
;---------------------------------------------------------------------------------------- ;----------------------------------------------------------------------------------------
;void* __fastcall__ em_map(unsigned page); ;void* __fastcall__ em_map(unsigned page);
@@ -137,10 +157,10 @@ MAP:
cmp #$80 cmp #$80
bcs return_null bcs return_null
sta curpage sta curpage
lda #<dummy ;load .A/.X with adress of data for COPYFROM-call (which expects the lda #<dummy ; load .A/.X with adress of data for COPYFROM-call (which expects the
ldx #>dummy ;adress in .A/.X) ldx #>dummy ; adress in .A/.X)
jsr COPYFROM jsr COPYFROM
bcs return_win ;function returns pointer to window (returns always with carry set!) bcs return_win ; function returns pointer to window (returns always with carry set!)
;---------------------------------------------------------------------------------------- ;----------------------------------------------------------------------------------------
;void __fastcall__ em_commit(void); ;void __fastcall__ em_commit(void);
@@ -149,8 +169,8 @@ COMMIT:
lda curpage lda curpage
cmp #$80 cmp #$80
bcs return bcs return
lda #<dummy ;load .A/.X with adress of data for COPYTO-call (which expects the lda #<dummy ; load .A/.X with adress of data for COPYTO-call (which expects the
ldx #>dummy ;adress in .A/.X) ldx #>dummy ; adress in .A/.X)
;---------------------------------------------------------------------------------------- ;----------------------------------------------------------------------------------------
;void __fastcall__ em_copyto (struct em_copy *copy_data); ;void __fastcall__ em_copyto (struct em_copy *copy_data);
@@ -161,7 +181,7 @@ COPYTO:
;copy the main copyto routine into Lo_Mem ;copy the main copyto routine into Lo_Mem
ldy #Lo_Code1_End - Lo_Code1 ldy #Lo_Code1_End - Lo_Code1
: lda Lo_Code1-1,y : lda Lo_Code1-1,y
sta Lo_Mem-1,y sta Lo_Mem-1,y
dey dey
bne :- bne :-
@@ -172,11 +192,11 @@ COMMON:
;this part will be executed in Lo_Mem (!) by COPYFROM ;this part will be executed in Lo_Mem (!) by COPYFROM
Lo_Code2: Lo_Code2:
stx $de00 ;map in rr-ram stx $de00 ;map in rr-ram
lda (rr_ram),y ;get byte from rr-ram lda (rr_ram),y ;get byte from rr-ram
sty $de00 ;RR-ROM will be mapped to $8000-$a000 but write access will go to c64-ram anyway!! sty $de00 ;RR-ROM will be mapped to $8000-$a000 but write access will go to c64-ram anyway!!
sta (c64_ram),y ;and write to c64-ram sta (c64_ram),y ;and write to c64-ram
nop ;pad to same size as Lo_Code1 nop ;pad to same size as Lo_Code1
nop nop
Lo_Code2_End: Lo_Code2_End:
@@ -184,41 +204,41 @@ Lo_Code2_End:
;this part will be executed in Lo_Mem (!) by COPYTO ;this part will be executed in Lo_Mem (!) by COPYTO
Lo_Code1: Lo_Code1:
lda (c64_ram),y ;read 1 byte from c64-ram lda (c64_ram),y ;read 1 byte from c64-ram
stx $de00 ;map in rr-ram stx $de00 ;map in rr-ram
sta (rr_ram),y ;write byte to rr-ram sta (rr_ram),y ;write byte to rr-ram
lda #$02 ;map in c64-ram again lda #$02 ;map in c64-ram again
sta $de00 sta $de00
;12 bytes ;12 bytes
;this part is common for both COPYFROM/COPYTO and executed in Lo_Mem, too ;this part is common for both COPYFROM/COPYTO and executed in Lo_Mem, too
Lo_Code_Common: Lo_Code_Common:
inc c64_ram ;increase pointers inc c64_ram ;increase pointers
bne :+ bne :+
inc c64_ram+1 inc c64_ram+1
: inc rr_ram : inc rr_ram
bne @skip bne @skip
inc rr_ram+1 inc rr_ram+1
lda rr_ram+1 lda rr_ram+1
cmp #$a0 ;wrap around 16k boundary in rr-ram window ($8000-$a000) cmp #$a0 ;wrap around 16k boundary in rr-ram window ($8000-$a000)
bne @skip bne @skip
lda #$80 ;reset pointer to $8000 lda #$80 ;reset pointer to $8000
sta rr_ram+1 sta rr_ram+1
txa ;adjust value in .X to map in next 16k-bank in rr-ram txa ;adjust value in .X to map in next 16k-bank in rr-ram
adc #7 ;carry is set because of former CMP, so it adds 8 adc #7 ;carry is set because of former CMP, so it adds 8
tax tax
;27 bytes ;27 bytes
@skip: lda c64_ram @skip: lda c64_ram
cmp len cmp len
lda c64_ram+1 lda c64_ram+1
sbc len+1 sbc len+1
bcc Lo_Code1 bcc Lo_Code1
lda #2 ;CHANGE to LDA #0 if driver is called from ROM lda #2 ;CHANGE to LDA #0 if driver is called from ROM
sta $de00 sta $de00
cli cli
rts ;17 bytes = 56 bytes Lo_Code ($38) rts ;17 bytes = 56 bytes Lo_Code ($38)
Lo_Code1_End: Lo_Code1_End:
;---------------------------------------------------------------------------------------- ;----------------------------------------------------------------------------------------
;void __fastcall__ em_copyfrom(struct em_copy *copy_data); ;void __fastcall__ em_copyfrom(struct em_copy *copy_data);
@@ -228,16 +248,16 @@ COPYFROM:
jsr get_struct_data jsr get_struct_data
ldy #Lo_Code2_End - Lo_Code2 ;copy routine into Lo_Mem ldy #Lo_Code2_End - Lo_Code2 ;copy routine into Lo_Mem
: lda Lo_Code2-1,y : lda Lo_Code2-1,y
sta Lo_Mem-1,y sta Lo_Mem-1,y
dey dey
bne :- bne :-
ldy #Lo_Code1_End-Lo_Code_Common ldy #Lo_Code1_End-Lo_Code_Common
: lda Lo_Code_Common-1,y : lda Lo_Code_Common-1,y
sta Lo_Mem+11,y sta Lo_Mem+11,y
dey dey
bne :- bne :-
beq COMMON ;and execute... beq COMMON ;and execute...
;---------------------------------------------------------------------------------------- ;----------------------------------------------------------------------------------------
;read the struct data located at (.A/.X) ;read the struct data located at (.A/.X)
;and setup parameters for stash/ fetch operation ;and setup parameters for stash/ fetch operation
@@ -247,39 +267,40 @@ get_struct_data:
;read and process the values from the em_copy struct passed to as parameters rameter to the ;read and process the values from the em_copy struct passed to as parameters rameter to the
;functions em_copyto and em_copyfrom ;functions em_copyto and em_copyfrom
sta aux ;store adress of struct (passed in .A/.X) into a zp pointer sta aux ;store adress of struct (passed in .A/.X) into a zp pointer
stx aux+1 stx aux+1
ldy #0 ;index 0 ldy #0 ;index 0
lda (aux),y ;read c64-adress lo lda (aux),y ;read c64-adress lo
sta c64_ram sta c64_ram
iny iny
lda (aux),y ;read c64-adress hi lda (aux),y ;read c64-adress hi
sta c64_ram+1 ;(c64_ram) --> points to c64-adress space sta c64_ram+1 ;(c64_ram) --> points to c64-adress space
iny iny
lda (aux),y ;read rr-adress lo lda (aux),y ;read rr-adress lo
sta rr_ram sta rr_ram
iny iny
lda (aux),y ;rr-adress hi lda (aux),y ;rr-adress hi
pha ;remember pha ;remember
and #$1f and #$1f
ora #$80 ;adjust into 16k-window ($8000-$a000) ora #$80 ;adjust into 16k-window ($8000-$a000)
sta rr_ram+1 sta rr_ram+1
pla ;re-get hi byte of rr-adress pla ;re-get hi byte of rr-adress
and #$60 ;isolate bits 5 and 6 and #$60 ;isolate bits 5 and 6
lsr lsr
lsr ;shift into bits 3 and 4 lsr ;shift into bits 3 and 4
ora #$23 ;set bit 5 (select ram) and 1+2 (game/exrom setting for ULTIMAX-mode) ora #$23 ;set bit 5 (select ram) and 1+2 (game/exrom setting for ULTIMAX-mode)
tax ;.X has now the value to write into $de00 to acess rr-ram at desired 16k-bank tax ;.X has now the value to write into $de00 to acess rr-ram at desired 16k-bank
iny iny
iny ;skip unused byte iny ;skip unused byte
lda (aux),y ;read length lo-byte lda (aux),y ;read length lo-byte
clc clc
adc c64_ram ;add to c64-addres adc c64_ram ;add to c64-addres
sta len sta len
iny iny
lda (aux),y ;length hi-byte lda (aux),y ;length hi-byte
adc c64_ram+1 adc c64_ram+1
sta len+1 ;tmp2: length, tmp3 contains end adress of transfer in c64-ram. sta len+1 ;tmp2: length, tmp3 contains end adress of transfer in c64-ram.
rts ;55 bytes rts
;55 bytes