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@@ -4,6 +4,8 @@ SYS_WRITE equ 4
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STDIN equ 0
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STDOUT equ 1
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SYS_IOCTL equ 54
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+SYS_TIMER_FD_CREATE equ 0x142
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+SYS_TIMER_FD_SETTIME equ 0x145
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section .bss
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sz RESB 4 ; 4 byte for window size
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@@ -11,8 +13,11 @@ section .bss
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srow resb 1;
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scol resb 1;
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section .data
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+ ;num to ascii variables
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ha db 0 ;hundreds
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ta db 0 ;tens
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+
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+ ;graphics layout
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rcount db 0;
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lb db 0xa; linebrak
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tof db 0; ; top offset
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@@ -27,11 +32,25 @@ section .data
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hl db 0x2d ;horizontal line |
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vl db 0x7c ;vertical line -
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+ ;timer
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+ tfd RESB 4 ;file descriptro
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+ itimer RESQ 2 ;timer init struct
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+ tval RESB 8 ;variable to store triggercount when reading timmerfd
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section .text
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global _start
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_start:
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+
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+ ;create timer
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+ mov eax, SYS_TIMER_FD_CREATE
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+ mov ebx, 1
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+ mov ecx, 0
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+ int 0x80
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+
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+ ;store fd adress
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+ mov [tfd], eax
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+
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; get windwo size
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mov eax, SYS_IOCTL ; syscall ioctl
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mov ebx, STDOUT ; stdout for something?
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@@ -205,3 +224,12 @@ inctens:
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inc byte [ta] ;increment tens
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sub ecx, 0xa
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jmp tens
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+
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+;read from timerfd blocking system till timer triggers
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+fd_wait:
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+ mov eax, SYS_READ
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+ mov ebx, [tfd]
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+ mov ecx, tval
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+ mov edx, 0x20
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+ int 0x80
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+ ret
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