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cc65/libsrc/apple2/getres.s
Oliver Schmidt 3b128ba59f Use MACHID to check for realtime clock.
There's no need to do guesswork to know if a realtime clock is present/active.
2019-09-10 09:49:06 +02:00

64 lines
1.2 KiB
ArmAsm

;
; Oliver Schmidt, 15.08.2018
;
; int __fastcall__ clock_getres (clockid_t clk_id, struct timespec *res);
;
.import __dos_type
.import incsp1, return0
.include "time.inc"
.include "zeropage.inc"
.include "errno.inc"
.include "mli.inc"
_clock_getres:
sta ptr1
stx ptr1+1
; Cleanup stack
jsr incsp1
; Check for ProDOS 8
lda __dos_type
beq enosys
; Presume day resolution
ldx #<day_res
ldy #>day_res
; Check for realtme clock
lda MACHID
lsr a
bcc :+
; Switch to minute resolution
ldx #<min_res
ldy #>min_res
; Copy timespec
: stx ptr2
sty ptr2+1
ldy #.sizeof(timespec)-1
: lda (ptr2),y
sta (ptr1),y
dey
bpl :-
; Return success
jmp return0
; Load errno code
enosys: lda #ENOSYS
; Set __errno
jmp __directerrno
.rodata
min_res:.dword 60
.dword 0
day_res:.dword 60 * 60 * 24
.dword 0