prog8/compiler/res/prog8lib/virtual/syslib.p8
Irmen de Jong 0d4dd385b8 added '%ir' to write inline IR code, '%asm' is now only for real 6502 assembly.
(%ir is probably only used in the library modules for the virtual machine target)
2022-09-30 15:12:26 +02:00

222 lines
4.9 KiB
Lua

; Prog8 definitions for the Virtual Machine
sys {
; ------- lowlevel system routines --------
const ubyte target = 255 ; compilation target specifier. 64 = C64, 128 = C128, 16 = CommanderX16, 8 = atari800XL, 255 = virtual
sub reset_system() {
; Soft-reset the system back to initial power-on Basic prompt.
%ir {{
syscall 0
}}
}
sub wait(uword jiffies) {
; --- wait approximately the given number of jiffies (1/60th seconds)
%ir {{
loadm.w r0,sys.wait.jiffies
syscall 13
}}
}
sub waitvsync() {
; --- busy wait till the next vsync has occurred (approximately), without depending on custom irq handling.
%ir {{
syscall 14
}}
}
sub internal_stringcopy(uword source, uword tgt) {
; Called when the compiler wants to assign a string value to another string.
while @(source) {
@(tgt) = @(source)
source++
tgt++
}
@(tgt)=0
}
sub memcopy(uword source, uword tgt, uword count) {
repeat count {
@(tgt) = @(source)
source++
tgt++
}
}
sub memset(uword mem, uword numbytes, ubyte value) {
repeat numbytes {
@(mem) = value
mem++
}
}
sub memsetw(uword mem, uword numwords, uword value) {
repeat numwords {
pokew(mem, value)
mem+=2
}
}
sub exit(ubyte returnvalue) {
; -- immediately exit the program with a return code in the A register
%ir {{
loadm.b r0,sys.exit.returnvalue
syscall 1
}}
}
sub set_carry() {
%ir {{
sec
}}
}
sub clear_carry() {
%ir {{
clc
}}
}
sub gfx_enable(ubyte mode) {
%ir {{
loadm.b r0,sys.gfx_enable.mode
syscall 8
}}
}
sub gfx_clear(ubyte color) {
%ir {{
loadm.b r0,sys.gfx_clear.color
syscall 9
}}
}
sub gfx_plot(uword xx, uword yy, ubyte color) {
%ir {{
loadm.w r0,sys.gfx_plot.xx
loadm.w r1,sys.gfx_plot.yy
loadm.b r2,sys.gfx_plot.color
syscall 10
}}
}
sub gfx_getpixel(uword xx, uword yy) -> ubyte {
%ir {{
loadm.w r0,sys.gfx_getpixel.xx
loadm.w r1,sys.gfx_getpixel.yy
syscall 30
return
}}
}
}
cx16 {
; the sixteen virtual 16-bit registers that the CX16 has defined in the zeropage
; they are simulated on the VirtualMachine as well but their location in memory is different
&uword r0 = $ff02
&uword r1 = $ff04
&uword r2 = $ff06
&uword r3 = $ff08
&uword r4 = $ff0a
&uword r5 = $ff0c
&uword r6 = $ff0e
&uword r7 = $ff10
&uword r8 = $ff12
&uword r9 = $ff14
&uword r10 = $ff16
&uword r11 = $ff18
&uword r12 = $ff1a
&uword r13 = $ff1c
&uword r14 = $ff1e
&uword r15 = $ff20
&word r0s = $ff02
&word r1s = $ff04
&word r2s = $ff06
&word r3s = $ff08
&word r4s = $ff0a
&word r5s = $ff0c
&word r6s = $ff0e
&word r7s = $ff10
&word r8s = $ff12
&word r9s = $ff14
&word r10s = $ff16
&word r11s = $ff18
&word r12s = $ff1a
&word r13s = $ff1c
&word r14s = $ff1e
&word r15s = $ff20
&ubyte r0L = $ff02
&ubyte r1L = $ff04
&ubyte r2L = $ff06
&ubyte r3L = $ff08
&ubyte r4L = $ff0a
&ubyte r5L = $ff0c
&ubyte r6L = $ff0e
&ubyte r7L = $ff10
&ubyte r8L = $ff12
&ubyte r9L = $ff14
&ubyte r10L = $ff16
&ubyte r11L = $ff18
&ubyte r12L = $ff1a
&ubyte r13L = $ff1c
&ubyte r14L = $ff1e
&ubyte r15L = $ff20
&ubyte r0H = $ff03
&ubyte r1H = $ff05
&ubyte r2H = $ff07
&ubyte r3H = $ff09
&ubyte r4H = $ff0b
&ubyte r5H = $ff0d
&ubyte r6H = $ff0f
&ubyte r7H = $ff11
&ubyte r8H = $ff13
&ubyte r9H = $ff15
&ubyte r10H = $ff17
&ubyte r11H = $ff19
&ubyte r12H = $ff1b
&ubyte r13H = $ff1d
&ubyte r14H = $ff1f
&ubyte r15H = $ff21
&byte r0sL = $ff02
&byte r1sL = $ff04
&byte r2sL = $ff06
&byte r3sL = $ff08
&byte r4sL = $ff0a
&byte r5sL = $ff0c
&byte r6sL = $ff0e
&byte r7sL = $ff10
&byte r8sL = $ff12
&byte r9sL = $ff14
&byte r10sL = $ff16
&byte r11sL = $ff18
&byte r12sL = $ff1a
&byte r13sL = $ff1c
&byte r14sL = $ff1e
&byte r15sL = $ff20
&byte r0sH = $ff03
&byte r1sH = $ff05
&byte r2sH = $ff07
&byte r3sH = $ff09
&byte r4sH = $ff0b
&byte r5sH = $ff0d
&byte r6sH = $ff0f
&byte r7sH = $ff11
&byte r8sH = $ff13
&byte r9sH = $ff15
&byte r10sH = $ff17
&byte r11sH = $ff19
&byte r12sH = $ff1b
&byte r13sH = $ff1d
&byte r14sH = $ff1f
&byte r15sH = $ff21
}