isr.asm

extern ISR_Handler



%macro PUSHALL 0
    push rax
    push rbx
    push rcx
    push rdx
    push rsp
    push rbp
    push rsi
    push rdi
%endmacro

%macro POPALL 0
    pop rdi
    pop rsi
    pop rbp
    pop rsp
    pop rdx
    pop rcx
    pop rbx
    pop rax
%endmacro



; cpu pushes to the stack: ss, esp, eflags, cs, eip

%macro ISR_NOERRORCODE 1

global X64_ISR%1:
X64_ISR%1:
    push  0              ; push dummy error code
    push  %1             ; push interrupt number
    jmp isr_common

%endmacro

%macro ISR_ERRORCODE 1
global X64_ISR%1:
X64_ISR%1:
                        ; cpu pushes an error code to the stack
    push %1             ; push interrupt number
    jmp isr_common

%endmacro

; !!! THIS FILE IS AUTOGENERATED !!!
ISR_NOERRORCODE 0
ISR_NOERRORCODE 1
ISR_NOERRORCODE 2
ISR_NOERRORCODE 3
ISR_NOERRORCODE 4
ISR_NOERRORCODE 5
ISR_NOERRORCODE 6
ISR_NOERRORCODE 7
ISR_ERRORCODE 8
ISR_NOERRORCODE 9
ISR_ERRORCODE 10
ISR_ERRORCODE 11
ISR_ERRORCODE 12
ISR_ERRORCODE 13
ISR_ERRORCODE 14
ISR_NOERRORCODE 15
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ISR_ERRORCODE 17
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ISR_ERRORCODE 21
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ISR_NOERRORCODE 255

isr_common:
    PUSHALL

    ; Save CPU State
    mov ax, ds
    push rax

    ; Set the segdefs to kernel segment descriptor
    mov ax, 0x10
    mov ds, ax
    mov es, ax
    mov fs, ax
    mov gs, ax

    ; Call the isr handler
    call ISR_Handler

    pop rax
    mov ds, ax
    mov es, ax
    mov fs, ax
    mov gs, ax
    POPALL

    add rsp, 8          ; Removes the pushed error code and ISR number
    iretq