matos/arch/x86/irq_pit.S

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ArmAsm
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#define ASM_SOURCE 1
#include "segment.h"
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.file "irq_pit.S"
.text
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.extern switchKthread
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.globl pit_handler
.type pit_handler, @function
pit_handler: // already got eflags, cs and eip on stack thanks to CPU
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pushl $0 // err_code esp+12+7*4=40
pushl %ebp
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movl %esp, %ebp
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pushl %eax
pushl %ecx
pushl %edx
pushl %ebx
pushl %esi
pushl %edi
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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
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/* 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
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/* Send EOI to PIC */
movb $0x20, %al
outb %al, $0x20
pushl %esp
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call pitIrqHandler
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addl $4, %esp
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movl %eax,%esp
/* Restore the CPU context */
popw %gs
popw %fs
popw %es
popw %ds
popw %ss
addl $2,%esp
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popl %edi
popl %esi
popl %ebx
popl %edx
popl %ecx
popl %eax
popl %ebp
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addl $4, %esp /* Ignore "error code" */
/* This restores the eflags, the cs and the eip registers */
iret /* equivalent to: popfl ; ret */