kernel2/include/memphys.h

   1 /*
   2     meinOS - A unix-like x86 microkernel operating system
   3     Copyright (C) 2008  Janosch Gräf <janosch.graef@gmx.net>
   4
   5     This program is free software: you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation, either version 3 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19 #ifndef _MEMPHYS_H_
  20 #define _MEMPHYS_H_
  21
  22 #include <sys/types.h>
  23 #include <limits.h>
  24 #include <sizes.h>
  25
  26 #define MEMPHYS_DMALIMIT        (16*MBYTES)
  27
  28 #define memphys_alloc()    memphys_pop()
  29 #define memphys_free(addr) memphys_push(addr)
  30
  31 /// how much memory available
  32 size_t memphys_memory;
  33
  34 void **memphys_stackbase;
  35 void **memphys_stackend;
  36 void **memphys_stackptr;
  37
  38 int *memphys_dma_bitmap;
  39 size_t memphys_dma_bitmap_size;
  40
  41 int memphys_init();
  42 void *memphys_alloc();
  43 void memphys_free(void *addr);
  44 size_t memphys_memleft();
  45 int memphys_dma_init();
  46 void *memphys_dma_alloc(size_t pages);
  47 void memphys_dma_free(void *addr);
  48
  49 #endif