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global int_clock_handler
[extern task_switch_next]
CLOCK_COUNTER:
db 0x00
[bits 32]
int_clock_handler:
;Notice there is no IRQ number or error code - we don't need them
inc byte [CLOCK_COUNTER]
cmp byte [CLOCK_COUNTER], 0x10
jne skip_clock
mov byte [CLOCK_COUNTER], 0x00
pusha ;Push all standard registers
push esp ;Push pointer to all the stuff we just pushed
call task_switch_next ;Call C code
mov esp, eax ;Replace the stack with what the C code gave us
popa ;Put the standard registers back
skip_clock:
mov al, 0x20 ;Port number AND command number to Acknowledge IRQ
out 0x20, al ;Acknowledge IRQ, so we keep getting interrupts
;We didn't push an error code or IRQ number, so we don't have to edit esp now
iret ;Interrupt-Return
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