On 08/20/2009 12:26 AM, Saksena, Abhishek wrote:
Hi Guys,
I am writing very simple bios for KVM (not using Qemu but creating a simple io
device models around KVM). I am having trouble in receiving regular Timer
interrupts after programming PIT.
I think I have enabled PIC and PIT correctly using following code:-
PIC Programming
;; PIC
mov al, #0x00
out 0x21, AL ;master pic: all IRQs unmasked
out 0xA1, AL ;slave pic: all IRQs unmasked
PIT Programming
and also enable PIT to genrate regular timer interruput
SET_INT_VECTOR(0x08, #0xF000, #int08_handler)
mov al, #0x34 ; timer0: binary count, 16bit count, mode 2
out 0x43, al
mov al, #0x00 ; maximum count of 0000H = 18.2Hz
out 0x40, al
out 0x40, al
PIT Timer ISR code
Timer ISR code
;---------
;- INT08 -
;---------
.org 0xfea5 ; INT 08h System Timer ISR Entry Point
int08_handler:
sti
push ax
push ds
mov ax, #0x0040
mov ds, ax
mov ax, 0x006c ; increment lower word
inc ax
mov 0x006c, ax
jnz inc_done
mov ax, 0x006e ; increment upper word
inc ax
mov 0x006e, ax
For some reason I never see int08_handler ever been called. Any clues what may
be wrong? I am creating only one VCPU
Things to check:
- have you initialized the kernel PIC and PIT?
- are interrupts enabled?
--
error compiling committee.c: too many arguments to function
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