resources/physmem.h

   1 /* Quarn OS
   2  *
   3  * Physical Memory Manager
   4  *
   5  * Copyright (C) 2009 Pawel Dziepak
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  */
  22
  23 #ifndef _PHYSMEM_H_
  24 #define _PHYSMEM_H_
  25
  26 #include "memm.h"
  27 #include "libs/vector.h"
  28
  29 namespace resources {
  30         typedef unsigned int vaddr;
  31         typedef unsigned int paddr;
  32
  33         class physmem : public memm {
  34         public:
  35                 struct region {
  36                         vaddr start;
  37                         unsigned int size;
  38
  39                         vaddr last;
  40
  41                         enum type {
  42                                 kernel,
  43                                 kern2usr,
  44                                 iomem,
  45                                 user
  46                         } rtype;
  47                 };
  48
  49         private:
  50                 paddr last_p;
  51                 unsigned int available_memory;
  52
  53                 vector<region> regions;
  54
  55                 /* Speed up physical mem allocation */
  56                 const int default_region;
  57
  58         protected:
  59                 void map_page(paddr ppage, vaddr vpage);
  60
  61         public:
  62                 physmem();
  63
  64                 void *allocate_space(unsigned int);
  65                 vaddr get_page(region::type);
  66
  67                 void deallocate_space(void *page);
  68
  69                 virtual unsigned int get_size(void *ptr) const {
  70                         return 0x1000;
  71                 }
  72
  73                 static void register_type();
  74         };
  75 }
  76
  77 #endif