;=----------------------------------------------------------------------------=;
;                            OS on Kaleid                                      ;
;                                                                              ;
;   Desc: CPU management related functions                                     ;
;                                                                              ;
;                                                                              ;
;   Copyright © 2018-2020 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]

global divideByZero
global KeActivateSSE

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

;;
;; Bug test
;;
divideByZero:
    ret

;;
;; Activating SSE
;;
KeActivateSSE:
    push rax
    mov rax, cr0
    and ax, 0xFFFB       ;clear coprocessor emulation CR0.EM
    or ax, 0x2           ;set coprocessor monitoring CR0.MP
    mov cr0, rax
    mov rax, cr4
    or ax, 3 << 9        ;set CR4.OSFXSR and CR4.OSXMMEXCPT at the same time
    mov cr4, rax
    pop rax
    ret