170 lines
2.7 KiB
ArmAsm
170 lines
2.7 KiB
ArmAsm
; Dispatching to our interrupt handler code from assembly because some of this is
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; enourmous pain in C
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; Save the register state
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; call the C handler
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; executes iret(expects the stack to look like struct stack_state)
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; If the interrupt we need to handle doesn't produce an error code then must provide a 0
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; for consistency
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extern interrupt_handler
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extern cpu_reg_state
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extern stack_state
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extern idt_ptr
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extern irq_handler
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global load_idt
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load_idt:
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lidt [idt_ptr]
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ret
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%macro irq 2
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global irq_handler_%1
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irq_handler_%1:
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push dword 0
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push dword %2
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jmp common_irq_handler
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%endmacro
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%macro no_err_handler 1
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global no_err_handler_%1 ; defined in interrupts.h
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no_err_handler_%1:
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push dword 0
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push dword %1
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jmp common_int_handler
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%endmacro
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; deals with the intterrupts that do give us an error code
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%macro err_code_handler 1
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global err_code_handler_%1
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err_code_handler_%1:
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push dword %1
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jmp common_int_handler
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%endmacro
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extern interrupt_handler ; external handler (interrupts.c)
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common_int_handler:
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; save thigns before do our C-call
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pushad
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;push eax ecx edx ebx
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;push esp ebp esi edi
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push ds
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push es
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push fs
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push gs
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; load the kernel segment descriptor
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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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mov eax, esp ; pushing the stack into the next call
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push eax
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mov eax, interrupt_handler
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call eax ; preserve the eip register past this call
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; segments
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pop eax
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pop gs
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pop fs
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pop es
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pop ds
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popad
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add esp, 8
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; special instruction which lets us jump back to code
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; which was previously interrupted
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iret
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no_err_handler 0
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no_err_handler 1
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no_err_handler 2
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no_err_handler 3
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no_err_handler 4
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no_err_handler 5
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no_err_handler 6
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no_err_handler 7
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err_code_handler 8
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no_err_handler 9
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err_code_handler 10
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err_code_handler 11
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err_code_handler 12
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err_code_handler 13
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err_code_handler 14
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no_err_handler 15
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no_err_handler 16
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no_err_handler 17
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no_err_handler 18
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no_err_handler 19
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no_err_handler 20
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no_err_handler 21
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no_err_handler 22
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no_err_handler 23
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no_err_handler 24
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no_err_handler 25
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no_err_handler 26
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no_err_handler 27
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no_err_handler 28
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no_err_handler 29
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no_err_handler 30
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no_err_handler 31
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common_irq_handler:
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pusha
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push ds
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push es
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push fs
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push gs
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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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mov eax, esp
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push eax
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mov eax, irq_handler
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call eax
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pop eax
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pop gs
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pop fs
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pop es
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pop ds
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popa
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add esp, 8
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iret
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; Remapped IRQ's for the APIC
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; starting from irq 0 -> 15 but remapped to 32 -> 47
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irq 0, 32
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irq 1, 33
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irq 2, 34
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irq 3, 35
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irq 4, 36
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irq 5, 37
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irq 6, 38
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irq 7, 39
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irq 8, 40
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irq 9, 41
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irq 10, 42
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irq 11, 43
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irq 12, 44
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irq 13, 45
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irq 14, 46
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irq 15, 47 |