mirror of
https://github.com/irmen/prog8.git
synced 2024-11-26 11:49:22 +00:00
363 lines
8.4 KiB
Lua
363 lines
8.4 KiB
Lua
; Prog8 definitions for the Atari800XL
|
|
; Including memory registers, I/O registers, Basic and Kernal subroutines.
|
|
|
|
atari {
|
|
%option no_symbol_prefixing
|
|
|
|
&uword NMI_VEC = $FFFA ; 6502 nmi vector, determined by the kernal if banked in
|
|
&uword RESET_VEC = $FFFC ; 6502 reset vector, determined by the kernal if banked in
|
|
&uword IRQ_VEC = $FFFE ; 6502 interrupt vector, determined by the kernal if banked in
|
|
|
|
}
|
|
|
|
sys {
|
|
; ------- lowlevel system routines --------
|
|
|
|
%option no_symbol_prefixing
|
|
|
|
const ubyte target = 8 ; compilation target specifier. 64 = C64, 128 = C128, 16 = CommanderX16, 8 = atari800XL
|
|
|
|
asmsub init_system() {
|
|
; Initializes the machine to a sane starting state.
|
|
; Called automatically by the loader program logic.
|
|
; TODO
|
|
%asm {{
|
|
sei
|
|
cld
|
|
clc
|
|
; TODO reset screen mode etc etc
|
|
clv
|
|
cli
|
|
rts
|
|
}}
|
|
}
|
|
|
|
asmsub init_system_phase2() {
|
|
%asm {{
|
|
rts ; no phase 2 steps on the Atari
|
|
}}
|
|
}
|
|
|
|
asmsub reset_system() {
|
|
; Soft-reset the system back to initial power-on Basic prompt.
|
|
; TODO
|
|
%asm {{
|
|
sei
|
|
jmp (atari.RESET_VEC)
|
|
}}
|
|
}
|
|
|
|
sub wait(uword jiffies) {
|
|
; --- wait approximately the given number of jiffies (1/60th seconds)
|
|
; TODO
|
|
}
|
|
|
|
asmsub waitvsync() clobbers(A) {
|
|
; --- busy wait till the next vsync has occurred (approximately), without depending on custom irq handling.
|
|
; TODO
|
|
%asm {{
|
|
nop
|
|
rts
|
|
}}
|
|
}
|
|
|
|
asmsub internal_stringcopy(uword source @R0, uword target @AY) clobbers (A,Y) {
|
|
; Called when the compiler wants to assign a string value to another string.
|
|
%asm {{
|
|
sta P8ZP_SCRATCH_W1
|
|
sty P8ZP_SCRATCH_W1+1
|
|
lda cx16.r0
|
|
ldy cx16.r0+1
|
|
jmp prog8_lib.strcpy
|
|
}}
|
|
}
|
|
|
|
asmsub memcopy(uword source @R0, uword target @R1, uword count @AY) clobbers(A,X,Y) {
|
|
; note: only works for NON-OVERLAPPING memory regions!
|
|
; note: can't be inlined because is called from asm as well
|
|
%asm {{
|
|
ldx cx16.r0
|
|
stx P8ZP_SCRATCH_W1 ; source in ZP
|
|
ldx cx16.r0+1
|
|
stx P8ZP_SCRATCH_W1+1
|
|
ldx cx16.r1
|
|
stx P8ZP_SCRATCH_W2 ; target in ZP
|
|
ldx cx16.r1+1
|
|
stx P8ZP_SCRATCH_W2+1
|
|
cpy #0
|
|
bne _longcopy
|
|
|
|
; copy <= 255 bytes
|
|
tay
|
|
bne _copyshort
|
|
rts ; nothing to copy
|
|
|
|
_copyshort
|
|
; decrease source and target pointers so we can simply index by Y
|
|
lda P8ZP_SCRATCH_W1
|
|
bne +
|
|
dec P8ZP_SCRATCH_W1+1
|
|
+ dec P8ZP_SCRATCH_W1
|
|
lda P8ZP_SCRATCH_W2
|
|
bne +
|
|
dec P8ZP_SCRATCH_W2+1
|
|
+ dec P8ZP_SCRATCH_W2
|
|
|
|
- lda (P8ZP_SCRATCH_W1),y
|
|
sta (P8ZP_SCRATCH_W2),y
|
|
dey
|
|
bne -
|
|
rts
|
|
|
|
_longcopy
|
|
sta P8ZP_SCRATCH_B1 ; lsb(count) = remainder in last page
|
|
tya
|
|
tax ; x = num pages (1+)
|
|
ldy #0
|
|
- lda (P8ZP_SCRATCH_W1),y
|
|
sta (P8ZP_SCRATCH_W2),y
|
|
iny
|
|
bne -
|
|
inc P8ZP_SCRATCH_W1+1
|
|
inc P8ZP_SCRATCH_W2+1
|
|
dex
|
|
bne -
|
|
ldy P8ZP_SCRATCH_B1
|
|
bne _copyshort
|
|
rts
|
|
}}
|
|
}
|
|
|
|
asmsub memset(uword mem @R0, uword numbytes @R1, ubyte value @A) clobbers(A,X,Y) {
|
|
%asm {{
|
|
ldy cx16.r0
|
|
sty P8ZP_SCRATCH_W1
|
|
ldy cx16.r0+1
|
|
sty P8ZP_SCRATCH_W1+1
|
|
ldx cx16.r1
|
|
ldy cx16.r1+1
|
|
jmp prog8_lib.memset
|
|
}}
|
|
}
|
|
|
|
asmsub memsetw(uword mem @R0, uword numwords @R1, uword value @AY) clobbers(A,X,Y) {
|
|
%asm {{
|
|
ldx cx16.r0
|
|
stx P8ZP_SCRATCH_W1
|
|
ldx cx16.r0+1
|
|
stx P8ZP_SCRATCH_W1+1
|
|
ldx cx16.r1
|
|
stx P8ZP_SCRATCH_W2
|
|
ldx cx16.r1+1
|
|
stx P8ZP_SCRATCH_W2+1
|
|
jmp prog8_lib.memsetw
|
|
}}
|
|
}
|
|
|
|
inline asmsub read_flags() -> ubyte @A {
|
|
%asm {{
|
|
php
|
|
pla
|
|
}}
|
|
}
|
|
|
|
inline asmsub clear_carry() {
|
|
%asm {{
|
|
clc
|
|
}}
|
|
}
|
|
|
|
inline asmsub set_carry() {
|
|
%asm {{
|
|
sec
|
|
}}
|
|
}
|
|
|
|
inline asmsub clear_irqd() {
|
|
%asm {{
|
|
cli
|
|
}}
|
|
}
|
|
|
|
inline asmsub set_irqd() {
|
|
%asm {{
|
|
sei
|
|
}}
|
|
}
|
|
|
|
inline asmsub irqsafe_set_irqd() {
|
|
%asm {{
|
|
php
|
|
sei
|
|
}}
|
|
}
|
|
|
|
inline asmsub irqsafe_clear_irqd() {
|
|
%asm {{
|
|
plp
|
|
}}
|
|
}
|
|
|
|
sub disable_caseswitch() {
|
|
; no-op
|
|
}
|
|
|
|
sub enable_caseswitch() {
|
|
; no-op
|
|
}
|
|
|
|
inline asmsub exit(ubyte returnvalue @A) {
|
|
; -- immediately exit the program with a return code in the A register
|
|
; TODO
|
|
%asm {{
|
|
ldx prog8_lib.orig_stackpointer
|
|
txs
|
|
rts ; return to original caller
|
|
}}
|
|
}
|
|
|
|
inline asmsub progend() -> uword @AY {
|
|
%asm {{
|
|
lda #<prog8_program_end
|
|
ldy #>prog8_program_end
|
|
}}
|
|
}
|
|
|
|
}
|
|
|
|
cx16 {
|
|
%option no_symbol_prefixing
|
|
|
|
; the sixteen virtual 16-bit registers that the CX16 has defined in the zeropage
|
|
; they are simulated on the Atari as well but their location in memory is different
|
|
; TODO
|
|
&uword r0 = $1b00
|
|
&uword r1 = $1b02
|
|
&uword r2 = $1b04
|
|
&uword r3 = $1b06
|
|
&uword r4 = $1b08
|
|
&uword r5 = $1b0a
|
|
&uword r6 = $1b0c
|
|
&uword r7 = $1b0e
|
|
&uword r8 = $1b10
|
|
&uword r9 = $1b12
|
|
&uword r10 = $1b14
|
|
&uword r11 = $1b16
|
|
&uword r12 = $1b18
|
|
&uword r13 = $1b1a
|
|
&uword r14 = $1b1c
|
|
&uword r15 = $1b1e
|
|
|
|
&word r0s = $1b00
|
|
&word r1s = $1b02
|
|
&word r2s = $1b04
|
|
&word r3s = $1b06
|
|
&word r4s = $1b08
|
|
&word r5s = $1b0a
|
|
&word r6s = $1b0c
|
|
&word r7s = $1b0e
|
|
&word r8s = $1b10
|
|
&word r9s = $1b12
|
|
&word r10s = $1b14
|
|
&word r11s = $1b16
|
|
&word r12s = $1b18
|
|
&word r13s = $1b1a
|
|
&word r14s = $1b1c
|
|
&word r15s = $1b1e
|
|
|
|
&ubyte r0L = $1b00
|
|
&ubyte r1L = $1b02
|
|
&ubyte r2L = $1b04
|
|
&ubyte r3L = $1b06
|
|
&ubyte r4L = $1b08
|
|
&ubyte r5L = $1b0a
|
|
&ubyte r6L = $1b0c
|
|
&ubyte r7L = $1b0e
|
|
&ubyte r8L = $1b10
|
|
&ubyte r9L = $1b12
|
|
&ubyte r10L = $1b14
|
|
&ubyte r11L = $1b16
|
|
&ubyte r12L = $1b18
|
|
&ubyte r13L = $1b1a
|
|
&ubyte r14L = $1b1c
|
|
&ubyte r15L = $1b1e
|
|
|
|
&ubyte r0H = $1b01
|
|
&ubyte r1H = $1b03
|
|
&ubyte r2H = $1b05
|
|
&ubyte r3H = $1b07
|
|
&ubyte r4H = $1b09
|
|
&ubyte r5H = $1b0b
|
|
&ubyte r6H = $1b0d
|
|
&ubyte r7H = $1b0f
|
|
&ubyte r8H = $1b11
|
|
&ubyte r9H = $1b13
|
|
&ubyte r10H = $1b15
|
|
&ubyte r11H = $1b17
|
|
&ubyte r12H = $1b19
|
|
&ubyte r13H = $1b1b
|
|
&ubyte r14H = $1b1d
|
|
&ubyte r15H = $1b1f
|
|
|
|
&byte r0sL = $1b00
|
|
&byte r1sL = $1b02
|
|
&byte r2sL = $1b04
|
|
&byte r3sL = $1b06
|
|
&byte r4sL = $1b08
|
|
&byte r5sL = $1b0a
|
|
&byte r6sL = $1b0c
|
|
&byte r7sL = $1b0e
|
|
&byte r8sL = $1b10
|
|
&byte r9sL = $1b12
|
|
&byte r10sL = $1b14
|
|
&byte r11sL = $1b16
|
|
&byte r12sL = $1b18
|
|
&byte r13sL = $1b1a
|
|
&byte r14sL = $1b1c
|
|
&byte r15sL = $1b1e
|
|
|
|
&byte r0sH = $1b01
|
|
&byte r1sH = $1b03
|
|
&byte r2sH = $1b05
|
|
&byte r3sH = $1b07
|
|
&byte r4sH = $1b09
|
|
&byte r5sH = $1b0b
|
|
&byte r6sH = $1b0d
|
|
&byte r7sH = $1b0f
|
|
&byte r8sH = $1b11
|
|
&byte r9sH = $1b13
|
|
&byte r10sH = $1b15
|
|
&byte r11sH = $1b17
|
|
&byte r12sH = $1b19
|
|
&byte r13sH = $1b1b
|
|
&byte r14sH = $1b1d
|
|
&byte r15sH = $1b1f
|
|
|
|
asmsub save_virtual_registers() clobbers(A,Y) {
|
|
%asm {{
|
|
ldy #31
|
|
- lda cx16.r0,y
|
|
sta _cx16_vreg_storage,y
|
|
dey
|
|
bpl -
|
|
rts
|
|
|
|
_cx16_vreg_storage
|
|
.word 0,0,0,0,0,0,0,0
|
|
.word 0,0,0,0,0,0,0,0
|
|
}}
|
|
}
|
|
|
|
asmsub restore_virtual_registers() clobbers(A,Y) {
|
|
%asm {{
|
|
ldy #31
|
|
- lda save_virtual_registers._cx16_vreg_storage,y
|
|
sta cx16.r0,y
|
|
dey
|
|
bpl -
|
|
rts
|
|
}}
|
|
}
|
|
|
|
}
|