;=----------------------------------------------------------------------------=;
;                            GNU GPL OS/K                                      ;
;                                                                              ;
;   Desc: Interrupt Descriptor Table related functions                         ;
;                                                                              ;
;                                                                              ;
;   Copyright © 2018-2019 The OS/K Team                                        ;
;                                                                              ;
;   This file is part of OS/K.                                                 ;
;                                                                              ;
;   OS/K is free software: you can redistribute it and/or modify               ;
;   it under the terms of the GNU General Public License as published by       ;
;   the Free Software Foundation, either version 3 of the License, or          ;
;   (at your option) any later version.                                        ;
;                                                                              ;
;   OS/K is distributed in the hope that it will be useful,                    ;
;   but WITHOUT ANY WARRANTY; without even the implied warranty of             ;
;   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the              ;
;   GNU General Public License for more details.                               ;
;                                                                              ;
;   You should have received a copy of the GNU General Public License          ;
;   along with OS/K.  If not, see <https://www.gnu.org/licenses/>.             ;
;=----------------------------------------------------------------------------=;

[BITS 64]

%include "kaleid/kernel/cpu/cpuf.inc"

global KeLoadIDT
global divideByZero

extern _KeIdtPtr
extern _KeHandleISR

;;
;; Loads the IDT
;;
KeLoadIDT:
    lidt [_KeIdtPtr]
    ret

;;
;; Bug test
;;
divideByZero:
    ret

;;
;; ISR Exception pre-handler
;;
isrPreHandler:
    pushAll

    ; Check if we are switching from user mode to supervisor mode
    mov rax, [rsp + 152]
    and rax, 0x3000
    jz .SEnter

    swapgs ; XXX need TSS

.SEnter:
    ; Increment mask count as we configure all interrupts to mask IF
    ;   automatically in the IDT
    inc qword [gs:8]
    ; Call the C routine for dispatching an interrupt
    cld             ; DF must be cleared by the caller
    mov rdi, rsp    ; First argument points to the processor state
    mov rbp, 0      ; Terminate stack traces here

    call _KeHandleISR

    ; decrement mask count
    dec qword [gs:8]

    ; check if we are switching from supervisor to user mode
    mov rax, [rsp + 152]
    and rax, 0x3000
    jz .SExit

    swapgs ; XXX need TSS

.SExit:
    popAll
    ; pop the error code and interrupt id
    add rsp, 16

    iretq

;; Divide Error Fault
IsrWithoutErrCode 0

;; Debug Exception Fault/trap
IsrWithoutErrCode 1

;; NMI Interrupt
IsrWithoutErrCode 2

;; Breakpoint Trap
IsrWithoutErrCode 3

;; Overflow Trap
IsrWithoutErrCode 4

;; Bound Range Exceeded Fault
IsrWithoutErrCode 5

;; Invalid Opcode Fault
IsrWithoutErrCode 6

;; Device Not Available or No Math Coprocessor Fault
IsrWithoutErrCode 7

;; Coprocessor Segment Overrun Fault
IsrWithoutErrCode 9

;; x87 FPU Floating Point or Math Fault
IsrWithoutErrCode 16

;; Alignment Check Fault
IsrWithoutErrCode 17

;; Machine Check Abort
IsrWithoutErrCode 18

;; SIMD Floating Point Fault
IsrWithoutErrCode 19

;; Virtualization Exception Fault
IsrWithoutErrCode 20

;; Double Fault Abort
IsrWithErrCode   8

;; Invalid TSS Fault
IsrWithErrCode   10

;; Segment Not Present Fault
IsrWithErrCode   11

;; Stack Segment Fault
IsrWithErrCode   12

;; General Protection Fault
IsrWithErrCode   13

;; Page Fault
IsrWithErrCode   14

;; Reserved
IsrWithoutErrCode 15
IsrWithoutErrCode 21
IsrWithoutErrCode 22
IsrWithoutErrCode 23
IsrWithoutErrCode 24
IsrWithoutErrCode 25
IsrWithoutErrCode 26
IsrWithoutErrCode 27
IsrWithoutErrCode 28
IsrWithoutErrCode 29
IsrWithoutErrCode 30
IsrWithoutErrCode 31


;; IRQs
%assign i 32
%rep    225
        IsrWithoutErrCode i
%assign i i+1
%endrep