; Prog8 definitions for the Atari800XL ; Including memory registers, I/O registers, Basic and Kernal subroutines. atari { &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 ; ---- kernal routines ---- ; TODO 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 }} } } sys { ; ------- lowlevel system routines -------- const ubyte target = 8 ; compilation target specifier. 64 = C64, 128 = C128, 16 = CommanderX16, 8 = atari800XL 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 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 }} } } cx16 { ; 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 }