resources/physmem.cpp

   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 #include "arch/low/e820.h"
  24
  25 #include "manes/manec.h"
  26 #include "physmem.h"
  27
  28 using namespace resources;
  29
  30 physmem::physmem() : last_p((paddr)0x300000), available_memory(arch::get_memory_size()), default_region(0) {
  31         region kern = { (paddr)0, 0x80000000, (paddr)0x300000, region::kernel };
  32         regions.add(kern);
  33
  34         region usr = { (paddr)0x80000000, 0x80000000, (paddr)0x80000000, region::user };
  35         regions.add(usr);
  36 }
  37
  38 void physmem::map_page(paddr ppage, vaddr vpage) {
  39
  40 }
  41
  42 void *physmem::allocate_space(unsigned int) {
  43         paddr ppage = last_p;
  44         last_p += 0x1000;
  45
  46         if (last_p >= 0x400000)
  47                 critical("no more free memory");
  48
  49         vaddr vpage = regions[default_region].last;
  50         regions[default_region].last += 0x1000;
  51
  52         map_page(ppage, vpage);
  53
  54         return (void*)vpage;
  55 }
  56
  57 vaddr physmem::get_page(region::type t) {
  58         for (int i = 0; i < regions.get_count(); i++) {
  59                 if (regions[i].rtype == t) {
  60                         paddr ppage = last_p;
  61                         last_p += 0x1000;
  62
  63                         if (last_p >= 0x400000)
  64                                 critical("no more free memory");
  65
  66                         vaddr vpage = regions[i].last;
  67                         regions[i].last += 0x1000;
  68
  69                         map_page(ppage, vpage);
  70
  71                         return vpage;
  72                 }
  73         }
  74         /* throw */
  75         return (vaddr)0;
  76 }
  77
  78 void physmem::deallocate_space(void *page) {
  79 }
  80
  81 void physmem::register_type() {
  82         manes::manec::get()->register_type<physmem>("physmem", "manec");
  83 }
  84