drivers/media/video/zr36120_mem.c

   1 /*
   2     zr36120_mem.c - Zoran 36120/36125 based framegrabbers
   3
   4     Copyright (C) 1998-1999 Pauline Middelink <middelin@polyware.nl>
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 #include <linux/mm.h>
  22 #include <linux/pci.h>
  23 #include <linux/slab.h>
  24 #include <linux/module.h>
  25 #include <asm/io.h>
  26 #ifdef CONFIG_BIGPHYS_AREA
  27 #include <linux/bigphysarea.h>
  28 #endif
  29
  30 #include "zr36120.h"
  31 #include "zr36120_mem.h"
  32
  33 /*******************************/
  34 /* Memory management functions */
  35 /*******************************/
  36
  37 void* bmalloc(unsigned long size)
  38 {
  39         void* mem;
  40 #ifdef CONFIG_BIGPHYS_AREA
  41         mem = bigphysarea_alloc_pages(size/PAGE_SIZE, 1, GFP_KERNEL);
  42 #else
  43         /*
  44          * The following function got a lot of memory at boottime,
  45          * so we know its always there...
  46          */
  47         mem = (void*)__get_free_pages(GFP_USER|GFP_DMA,get_order(size));
  48 #endif
  49         if (mem) {
  50                 unsigned long adr = (unsigned long)mem;
  51                 while (size > 0) {
  52                         SetPageReserved(virt_to_page(phys_to_virt(adr)));
  53                         adr += PAGE_SIZE;
  54                         size -= PAGE_SIZE;
  55                 }
  56         }
  57         return mem;
  58 }
  59
  60 void bfree(void* mem, unsigned long size)
  61 {
  62         if (mem) {
  63                 unsigned long adr = (unsigned long)mem;
  64                 unsigned long siz = size;
  65                 while (siz > 0) {
  66                         ClearPageReserved(virt_to_page(phys_to_virt(adr)));
  67                         adr += PAGE_SIZE;
  68                         siz -= PAGE_SIZE;
  69                 }
  70 #ifdef CONFIG_BIGPHYS_AREA
  71                 bigphysarea_free_pages(mem);
  72 #else
  73                 free_pages((unsigned long)mem,get_order(size));
  74 #endif
  75         }
  76 }
  77
  78 MODULE_LICENSE("GPL");