kernel/arch/x86_64/paging_i486.s

   1 ;  ZeX/OS
   2 ;  Copyright (C) 2007  Tomas 'ZeXx86' Jedrzejek (zexx86@gmail.com)
   3 ;
   4 ;  This program is free software: you can redistribute it and/or modify
   5 ;  it under the terms of the GNU General Public License as published by
   6 ;  the Free Software Foundation, either version 3 of the License, or
   7 ;  (at your option) any later version.
   8 ;
   9 ;  This program is distributed in the hope that it will be useful,
  10 ;  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 ;  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 ;  GNU General Public License for more details.
  13 ;
  14 ;  You should have received a copy of the GNU General Public License
  15 ;  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17
  18 %macro  IMP 1
  19 %ifdef UNDERBARS
  20         EXTERN _%1
  21         %define %1 _%1
  22 %else
  23         EXTERN %1
  24 %endif
  25 %endmacro
  26
  27 %macro  EXP     1
  28         GLOBAL $_%1
  29         $_%1:
  30         GLOBAL $%1
  31         $%1:
  32 %endmacro
  33
  34 EXP read_cr0
  35         mov eax, cr0
  36         retn
  37
  38 EXP write_cr0
  39         push ebp
  40         mov ebp, esp
  41         mov eax, [ebp+8]
  42         mov cr0,  eax
  43         pop ebp
  44         retn
  45
  46 EXP read_cr3
  47         mov eax, cr3
  48         retn
  49
  50 EXP write_cr3
  51         push ebp
  52         mov ebp, esp
  53         mov eax, [ebp+8]
  54         mov cr3, eax
  55         pop ebp
  56         retn