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Implement int 28h: Idle callout

This commit is contained in:
Nero 2020-04-20 19:19:14 +02:00
parent 40065266f3
commit f8788720f5
1 changed files with 11 additions and 2 deletions
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13
boot/kernel.asm
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@ -204,6 +204,15 @@ ldbpb: push ds
pop ds
ret
; DOS 2+ - DOS IDLE INTERRUPT
; Usually hooked by TSRs
idle: sti
; sti takes one instruction to take effect
nop
; Wait until next interrupt
hlt
iret
; DOS 2+ - FAST CONSOLE OUTPUT
; IN al character to print
fputc: push ax
@ -215,7 +224,7 @@ fputc: push ax
pop ax
iret
main: hlt
main: int 0x28
jmp main
init: cli
@ -253,5 +262,5 @@ init: cli
ivects: dw int20h, int21h, iret, iret
dw iret, iret, iret, iret
dw iret, fputc, iret, iret
dw idle, fputc, iret, iret
dw iret, iret, iret, iret