2021-11-02 21:24:12 +01:00
|
|
|
#define ASM_SOURCE 1
|
|
|
|
|
#include "segment.h"
|
2020-04-23 00:49:09 +02:00
|
|
|
.file "irq_pit.S"
|
|
|
|
|
|
|
|
|
|
.text
|
|
|
|
|
|
2020-04-23 23:40:16 +02:00
|
|
|
.extern switchKthread
|
2020-04-23 00:49:09 +02:00
|
|
|
|
|
|
|
|
.globl pit_handler
|
|
|
|
|
.type pit_handler, @function
|
|
|
|
|
pit_handler: // already got eflags, cs and eip on stack thanks to CPU
|
2021-10-26 20:55:15 +02:00
|
|
|
pushl $0 // err_code esp+12+7*4=40
|
|
|
|
|
pushl %ebp
|
|
|
|
|
pushl %eax
|
|
|
|
|
pushl %ecx
|
|
|
|
|
pushl %edx
|
|
|
|
|
pushl %ebx
|
|
|
|
|
pushl %esi
|
|
|
|
|
pushl %edi
|
2020-04-23 00:49:09 +02:00
|
|
|
subl $2, %esp // (alignment) esp+10
|
|
|
|
|
pushw %ss // esp+8
|
|
|
|
|
pushw %ds // esp+6
|
|
|
|
|
pushw %es // esp+4
|
|
|
|
|
pushw %fs // esp+2
|
|
|
|
|
pushw %gs // esp
|
|
|
|
|
|
2021-11-02 21:24:12 +01:00
|
|
|
/* Set correct kernel segment descriptors' value */
|
|
|
|
|
movw $BUILD_SEGMENT_REG_VALUE(0, 0, SEG_KDATA), %di
|
|
|
|
|
pushw %di ; popw %ds
|
|
|
|
|
pushw %di ; popw %es
|
|
|
|
|
pushw %di ; popw %fs
|
|
|
|
|
pushw %di ; popw %gs
|
|
|
|
|
|
2020-04-23 00:49:09 +02:00
|
|
|
/* Send EOI to PIC */
|
|
|
|
|
movb $0x20, %al
|
|
|
|
|
outb %al, $0x20
|
|
|
|
|
|
|
|
|
|
pushl %esp
|
2020-04-27 23:08:36 +02:00
|
|
|
call pitIrqHandler
|
2020-04-23 00:49:09 +02:00
|
|
|
movl %eax,%esp
|
|
|
|
|
|
|
|
|
|
/* Restore the CPU context */
|
|
|
|
|
popw %gs
|
|
|
|
|
popw %fs
|
|
|
|
|
popw %es
|
|
|
|
|
popw %ds
|
|
|
|
|
popw %ss
|
|
|
|
|
addl $2,%esp
|
2021-10-26 20:55:15 +02:00
|
|
|
popl %edi
|
|
|
|
|
popl %esi
|
|
|
|
|
popl %ebx
|
|
|
|
|
popl %edx
|
|
|
|
|
popl %ecx
|
|
|
|
|
popl %eax
|
|
|
|
|
popl %ebp
|
2020-04-23 00:49:09 +02:00
|
|
|
addl $4, %esp /* Ignore "error code" */
|
|
|
|
|
|
|
|
|
|
/* This restores the eflags, the cs and the eip registers */
|
|
|
|
|
iret /* equivalent to: popfl ; ret */
|
