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entry.asm
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[bits 32]
[global start]
[extern kmain]
start:
; initialise stack
mov esp, sys_stack
call kmain
jmp $ ; this should happen when returning from kernel main
; shutdown?
; multiboot headers to be put here
; loads interrupt descriptor table
[global idt_load]
[extern idtp]
idt_load:
lidt [idtp]
ret
; common stub for interrupt service routines
[extern fault_handler]
isr_common_stub:
pusha
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 stack
push eax
mov eax, fault_handler
call eax ; preserve eip while calling
pop eax
pop gs
pop fs
pop es
pop ds
popa
add esp, 8 ; clean pushed error code and isr number
iret ; pop cs, eip, eflags, ss, esp
; common stub for interrupt request ISRs
[extern irq_handler]
irq_common_stub:
pusha
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 stack
push eax
mov eax, irq_handler
call eax ; preserve eip while calling
pop eax
pop gs
pop fs
pop es
pop ds
popa
add esp, 8 ; clean pushed error code and isr number
iret ; pop cs, eip, eflags, ss, esp
; interrupt service routines
; interrupt 0: divide by zero
[global isr0]
isr0:
cli
push byte 0
push byte 0
jmp isr_common_stub
; interrupt 1: debug
[global isr1]
isr1:
cli
push byte 0
push byte 1
jmp isr_common_stub
; interrupt 2: non-maskable interrupt
[global isr2]
isr2:
cli
push byte 0
push byte 2
jmp isr_common_stub
; interrupt 3: breakpoint
[global isr3]
isr3:
cli
push byte 0
push byte 3
jmp isr_common_stub
; interrupt 4: overflow
[global isr4]
isr4:
cli
push byte 0
push byte 4
jmp isr_common_stub
; interrupt 5: bound range exceeded
[global isr5]
isr5:
cli
push byte 0
push byte 5
jmp isr_common_stub
; interrupt 6: invalid opcode
[global isr6]
isr6:
cli
push byte 0
push byte 6
jmp isr_common_stub
; interrupt 7: device not available
[global isr7]
isr7:
cli
push byte 0
push byte 7
jmp isr_common_stub
; interrupt 8: double fault
[global isr8]
isr8:
cli
push byte 8
jmp isr_common_stub
; interrupt 9: coprocessor segment overrun
[global isr9]
isr9:
cli
push byte 0
push byte 9
jmp isr_common_stub
; interrupt 10: invalid tss
[global isr10]
isr10:
cli
push byte 10
jmp isr_common_stub
; interrupt 11: segment not present
[global isr11]
isr11:
cli
push byte 11
jmp isr_common_stub
; interrupt 12: stack segment fault
[global isr12]
isr12:
cli
push byte 12
jmp isr_common_stub
; interrupt 13: general protection fault
[global isr13]
isr13:
cli
push byte 13
jmp isr_common_stub
; interrupt 14: page fault
[global isr14]
isr14:
cli
push byte 14
jmp isr_common_stub
; interrupt 15: reserved
[global isr15]
isr15:
cli
push byte 0
push byte 15
jmp isr_common_stub
; interrupt 16: x87 floating-point exception
[global isr16]
isr16:
cli
push byte 0
push byte 16
jmp isr_common_stub
; interrupt 17: alignment check
[global isr17]
isr17:
cli
push byte 17
jmp isr_common_stub
; interrupt 18: machine check
[global isr18]
isr18:
cli
push byte 0
push byte 18
jmp isr_common_stub
; interrupt 19: simd floating-point exception
[global isr19]
isr19:
cli
push byte 0
push byte 19
jmp isr_common_stub
; interrupt 20: virtualization exception
[global isr20]
isr20:
cli
push byte 0
push byte 20
jmp isr_common_stub
; interrupt 21-29: reserved
[global isr21]
isr21:
cli
push byte 0
push byte 21
jmp isr_common_stub
[global isr22]
isr22:
cli
push byte 0
push byte 22
jmp isr_common_stub
[global isr23]
isr23:
cli
push byte 0
push byte 23
jmp isr_common_stub
[global isr24]
isr24:
cli
push byte 0
push byte 24
jmp isr_common_stub
[global isr25]
isr25:
cli
push byte 0
push byte 25
jmp isr_common_stub
[global isr26]
isr26:
cli
push byte 0
push byte 26
jmp isr_common_stub
[global isr27]
isr27:
cli
push byte 0
push byte 27
jmp isr_common_stub
[global isr28]
isr28:
cli
push byte 0
push byte 28
jmp isr_common_stub
[global isr29]
isr29:
cli
push byte 0
push byte 29
jmp isr_common_stub
; interrupt 30: security exception
[global isr30]
isr30:
cli
push byte 30
jmp isr_common_stub
; interrupt 32: reserved
[global isr31]
isr31:
cli
push byte 0
push byte 31
jmp isr_common_stub
; interrupt request based ISRs 0-15
; these are mapped to interrupts 32-47
[global irq0]
irq0:
cli
push byte 0
push byte 32
jmp irq_common_stub
[global irq1]
irq1:
cli
push byte 0
push byte 33
jmp irq_common_stub
[global irq2]
irq2:
cli
push byte 0
push byte 34
jmp irq_common_stub
[global irq3]
irq3:
cli
push byte 0
push byte 35
jmp irq_common_stub
[global irq4]
irq4:
cli
push byte 0
push byte 36
jmp irq_common_stub
[global irq5]
irq5:
cli
push byte 0
push byte 37
jmp irq_common_stub
[global irq6]
irq6:
cli
push byte 0
push byte 38
jmp irq_common_stub
[global irq7]
irq7:
cli
push byte 0
push byte 39
jmp irq_common_stub
[global irq8]
irq8:
cli
push byte 0
push byte 40
jmp irq_common_stub
[global irq9]
irq9:
cli
push byte 0
push byte 41
jmp irq_common_stub
[global irq10]
irq10:
cli
push byte 0
push byte 42
jmp irq_common_stub
[global irq11]
irq11:
cli
push byte 0
push byte 43
jmp irq_common_stub
[global irq12]
irq12:
cli
push byte 0
push byte 44
jmp irq_common_stub
[global irq13]
irq13:
cli
push byte 0
push byte 45
jmp irq_common_stub
[global irq14]
irq14:
cli
push byte 0
push byte 46
jmp irq_common_stub
[global irq15]
irq15:
cli
push byte 0
push byte 47
jmp irq_common_stub
; bss definition
section .bss
resb 8192 ; stack grows downwards. so reserve space,
sys_stack: ; and then declare the identifier