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lesson 20, preliminar
This commit is contained in:
Carlos Fenollosa
425
20-interrupts-timer/cpu/interrupt.asm
Normal file
425
20-interrupts-timer/cpu/interrupt.asm
Normal file
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; Defined in isr.c
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[extern isr_handler]
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[extern irq_handler]
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; Common ISR code
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isr_common_stub:
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; 1. Save CPU state
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pusha ; Pushes edi,esi,ebp,esp,ebx,edx,ecx,eax
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mov ax, ds ; Lower 16-bits of eax = ds.
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push eax ; save the data segment descriptor
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mov ax, 0x10 ; kernel data segment descriptor
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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; 2. Call C handler
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call isr_handler
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; 3. Restore state
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pop eax
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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popa
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add esp, 8 ; Cleans up the pushed error code and pushed ISR number
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sti
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iret ; pops 5 things at once: CS, EIP, EFLAGS, SS, and ESP
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; Common IRQ code. Identical to ISR code except for the 'call'
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; and the 'pop ebx'
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irq_common_stub:
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pusha
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mov ax, ds
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push eax
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mov ax, 0x10
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mov ds, ax
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mov es, ax
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mov fs, ax
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mov gs, ax
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call irq_handler ; Different than the ISR code
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pop ebx ; Different than the ISR code
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mov ds, bx
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mov es, bx
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mov fs, bx
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mov gs, bx
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popa
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add esp, 8
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sti
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iret
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; We don't get information about which interrupt was caller
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; when the handler is run, so we will need to have a different handler
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; for every interrupt.
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; Furthermore, some interrupts push an error code onto the stack but others
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; don't, so we will push a dummy error code for those which don't, so that
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; we have a consistent stack for all of them.
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; First make the ISRs global
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global isr0
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global isr1
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global isr2
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global isr3
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global isr4
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global isr5
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global isr6
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global isr7
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global isr8
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global isr9
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global isr10
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global isr11
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global isr12
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global isr13
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global isr14
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global isr15
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global isr16
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global isr17
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global isr18
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global isr19
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global isr20
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global isr21
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global isr22
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global isr23
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global isr24
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global isr25
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global isr26
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global isr27
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global isr28
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global isr29
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global isr30
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global isr31
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; IRQs
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global irq0
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global irq1
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global irq2
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global irq3
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global irq4
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global irq5
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global irq6
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global irq7
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global irq8
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global irq9
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global irq10
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global irq11
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global irq12
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global irq13
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global irq14
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global irq15
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; 0: Divide By Zero Exception
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isr0:
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cli
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push byte 0
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push byte 0
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jmp isr_common_stub
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; 1: Debug Exception
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isr1:
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cli
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push byte 0
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push byte 1
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jmp isr_common_stub
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; 2: Non Maskable Interrupt Exception
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isr2:
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cli
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push byte 0
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push byte 2
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jmp isr_common_stub
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; 3: Int 3 Exception
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isr3:
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cli
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push byte 0
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push byte 3
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jmp isr_common_stub
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; 4: INTO Exception
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isr4:
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cli
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push byte 0
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push byte 4
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jmp isr_common_stub
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; 5: Out of Bounds Exception
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isr5:
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cli
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push byte 0
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push byte 5
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jmp isr_common_stub
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; 6: Invalid Opcode Exception
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isr6:
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cli
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push byte 0
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push byte 6
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jmp isr_common_stub
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; 7: Coprocessor Not Available Exception
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isr7:
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cli
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push byte 0
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push byte 7
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jmp isr_common_stub
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; 8: Double Fault Exception (With Error Code!)
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isr8:
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cli
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push byte 8
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jmp isr_common_stub
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; 9: Coprocessor Segment Overrun Exception
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isr9:
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cli
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push byte 0
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push byte 9
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jmp isr_common_stub
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; 10: Bad TSS Exception (With Error Code!)
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isr10:
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cli
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push byte 10
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jmp isr_common_stub
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; 11: Segment Not Present Exception (With Error Code!)
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isr11:
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cli
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push byte 11
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jmp isr_common_stub
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; 12: Stack Fault Exception (With Error Code!)
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isr12:
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cli
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push byte 12
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jmp isr_common_stub
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; 13: General Protection Fault Exception (With Error Code!)
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isr13:
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cli
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push byte 13
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jmp isr_common_stub
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; 14: Page Fault Exception (With Error Code!)
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isr14:
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cli
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push byte 14
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jmp isr_common_stub
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; 15: Reserved Exception
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isr15:
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cli
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push byte 0
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push byte 15
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jmp isr_common_stub
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; 16: Floating Point Exception
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isr16:
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cli
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push byte 0
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push byte 16
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jmp isr_common_stub
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; 17: Alignment Check Exception
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isr17:
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cli
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push byte 0
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push byte 17
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jmp isr_common_stub
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; 18: Machine Check Exception
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isr18:
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cli
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push byte 0
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push byte 18
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jmp isr_common_stub
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; 19: Reserved
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isr19:
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cli
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push byte 0
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push byte 19
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jmp isr_common_stub
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; 20: Reserved
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isr20:
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cli
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push byte 0
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push byte 20
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jmp isr_common_stub
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; 21: Reserved
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isr21:
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cli
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push byte 0
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push byte 21
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jmp isr_common_stub
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; 22: Reserved
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isr22:
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cli
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push byte 0
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push byte 22
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jmp isr_common_stub
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; 23: Reserved
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isr23:
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cli
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push byte 0
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push byte 23
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jmp isr_common_stub
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; 24: Reserved
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isr24:
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cli
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push byte 0
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push byte 24
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jmp isr_common_stub
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; 25: Reserved
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isr25:
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cli
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push byte 0
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push byte 25
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jmp isr_common_stub
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; 26: Reserved
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isr26:
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cli
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push byte 0
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push byte 26
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jmp isr_common_stub
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; 27: Reserved
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isr27:
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cli
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push byte 0
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push byte 27
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jmp isr_common_stub
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; 28: Reserved
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isr28:
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cli
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push byte 0
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push byte 28
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jmp isr_common_stub
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; 29: Reserved
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isr29:
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cli
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push byte 0
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push byte 29
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jmp isr_common_stub
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; 30: Reserved
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isr30:
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cli
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push byte 0
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push byte 30
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jmp isr_common_stub
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; 31: Reserved
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isr31:
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cli
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push byte 0
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push byte 31
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jmp isr_common_stub
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; IRQ handlers
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irq0:
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cli
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push byte 0
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push byte 32
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jmp irq_common_stub
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irq1:
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cli
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push byte 1
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push byte 33
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jmp irq_common_stub
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irq2:
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cli
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push byte 2
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push byte 34
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jmp irq_common_stub
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irq3:
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cli
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push byte 3
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push byte 35
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jmp irq_common_stub
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irq4:
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cli
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push byte 4
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push byte 36
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jmp irq_common_stub
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irq5:
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cli
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push byte 5
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push byte 37
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jmp irq_common_stub
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irq6:
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cli
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push byte 6
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push byte 38
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jmp irq_common_stub
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irq7:
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cli
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push byte 7
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push byte 39
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jmp irq_common_stub
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irq8:
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cli
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push byte 8
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push byte 40
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jmp irq_common_stub
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irq9:
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cli
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push byte 9
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push byte 41
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jmp irq_common_stub
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irq10:
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cli
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push byte 10
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push byte 42
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jmp irq_common_stub
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irq11:
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cli
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push byte 11
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push byte 43
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jmp irq_common_stub
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irq12:
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cli
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push byte 12
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push byte 44
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jmp irq_common_stub
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irq13:
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cli
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push byte 13
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push byte 45
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jmp irq_common_stub
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irq14:
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cli
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push byte 14
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push byte 46
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jmp irq_common_stub
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irq15:
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cli
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push byte 15
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push byte 47
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jmp irq_common_stub
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