kernel3/kernel/interrupt_service_routines.s

global isr0		; division by zero
global isr1		; debug exception
global isr2		; Non-maskable interrupt
global isr3		; Breakpoint exception
global isr4		; Into detected overflow exception
global isr5		; Out of bounds exception
global isr6		; Invalid opcode exception
global isr7		; No co-processor exception
global isr8		; Double fault exception
global isr9		; Co-processor segment overrun exception
global isr10	; Bad TSS exception
global isr11	; Segment not present
global isr12	; Stack fault exception
global isr13	; General protection fault
global isr14	; Page fault exception
global isr15	; Unkown interrupt exception
global isr16	; Co-processor fault exception
global isr17	; Alignment check exception
global isr18	; Machine check exception
global isr19	; Reserved
global isr20
global isr21
global isr22
global isr23
global isr24
global isr25
global isr26
global isr27
global isr28
global isr29
global isr30
global isr31	; reserved

isr0:			; division by zero
	cli
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 0	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr1:			; debug exception
	cli
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 1	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr2:			; Non-maskable interrupt
	cli
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 2	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr3:			; Breakpoint exception
	cli
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 3	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr4:			; Into detected overflow exception
	cli
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 4	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr5:			; Out of bounds exception
	cli
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 5	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr6:			; Invalid opcode exception
	cli
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 6	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr7:			; No co-processor exception
	cli
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 7	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr8:			; Double fault exception
	cli
				; This interrupt pushes an error code, so we only need to push its number.
	push byte 8	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr9:			; Co-processor segment overrun exception
	cli
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 9	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr10:	; Bad TSS exception
	cli
				; This interrupt pushes an error code, so we only need to push its number.
	push byte 10	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr11:	; Segment not present
	cli
				; This interrupt pushes an error code, so we only need to push its number.
	push byte 11	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr12:			; Stack fault exception
	cli
				; This interrupt pushes an error code, so we only need to push its number.
	push byte 12	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr13:			; General protection fault
	cli
				; This interrupt pushes an error code, so we only need to push its number.
	push byte 13	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr14:			; Page fault exception
	cli
				; This interrupt pushes an error code, so we only need to push its number.
	push byte 14	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr15:			; Unkown interrupt exception
	cli	
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 15	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr16:			; Co-processor fault exception
	cli
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 16	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr17:			; Alignment check exception
	cli
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 17	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr18:			; Machine check exception
	cli
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 18	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr19:			; Reserved
	cli
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 19	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr20:
	cli
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 20	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr21:
	cli
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 21	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr22:
	cli
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 22	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr23:
	cli
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 23	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr24:
	cli
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 24	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr25:
	cli
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 25	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr26:
	cli
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 26	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr27:
	cli
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 27	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr28:
	cli
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 28	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr29:
	cli
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 29	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr30:
	cli
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 30	; Push the interrupt number to the stack
	jmp isr_common_stub
	
isr31:	; reserved
	cli
	push byte 0	; This doesn't produce an error code, so push a dummy code
				; to the stack. This keeps the stack uniform when calling the common interrupt stub.
	push byte 31	; Push the interrupt number to the stack
	jmp isr_common_stub
	
extern interrupt_handler

isr_common_stub:
	pusha			; Registers are pushed in this order: AX, CX, DX, BX, SP, BP, SI, DI
    push ds
    push es
    push fs
    push gs
    
    mov ax, 0x10   ; Load the Kernel Data Segment descriptor
    mov ds, ax
    mov es, ax
    mov fs, ax
    mov gs, ax
    mov eax, esp   ; Push the stack pointer
    push eax
    mov eax, interrupt_handler
    call eax       ; A special call, preserves the 'eip' register
    pop eax
    pop gs
    pop fs
    pop es
    pop ds
    popa
    add esp, 8     ; Cleans up the pushed error code and pushed ISR number
    iret           ; pops 5 things at once: CS, EIP, EFLAGS, SS, and ESP!