51 lines
2.2 KiB
NASM
51 lines
2.2 KiB
NASM
;=----------------------------------------------------------------------------=;
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; OS on Kaleid ;
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; ;
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; Desc: Paging related functions ;
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; ;
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; ;
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; Copyright © 2018-2020 The OS/K Team ;
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; ;
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; This file is part of OS/K. ;
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; ;
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; OS/K is free software: you can redistribute it and/or modify ;
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; it under the terms of the GNU General Public License as published by ;
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; the Free Software Foundation, either version 3 of the License, or ;
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; (at your option) any later version. ;
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; ;
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; OS/K is distributed in the hope that it will be useful, ;
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; but WITHOUT ANY WARRANTY; without even the implied warranty of ;
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;
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; GNU General Public License for more details. ;
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; ;
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; You should have received a copy of the GNU General Public License ;
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; along with OS/K. If not, see <https://www.gnu.org/licenses/>. ;
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;=----------------------------------------------------------------------------=;
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global MmEnableWriteProtect
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global MmDisableWriteProtect
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global MmLoadPML4
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MmEnableWriteProtect:
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push rax
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mov rax, cr0
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or rax, 1<<16
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mov cr0, rax
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pop rax
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ret
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MmDisableWriteProtect:
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push rax
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mov rax, cr0
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and rax, ~(1<<16)
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mov cr0, rax
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pop rax
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ret
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MmLoadPML4:
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push rax
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mov rax, rdi
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mov cr3, rax
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pop rax
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ret
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