release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mips/mipssim/sim_mem.c

   1 /*
   2  * Copyright (C) 2005 MIPS Technologies, Inc.  All rights reserved.
   3  *
   4  *  This program is free software; you can distribute it and/or modify it
   5  *  under the terms of the GNU General Public License (Version 2) as
   6  *  published by the Free Software Foundation.
   7  *
   8  *  This program is distributed in the hope it will be useful, but WITHOUT
   9  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  *  for more details.
  12  *
  13  *  You should have received a copy of the GNU General Public License along
  14  *  with this program; if not, write to the Free Software Foundation, Inc.,
  15  *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
  16  *
  17  */
  18 #include <linux/init.h>
  19 #include <linux/mm.h>
  20 #include <linux/bootmem.h>
  21 #include <linux/pfn.h>
  22
  23 #include <asm/bootinfo.h>
  24 #include <asm/page.h>
  25 #include <asm/sections.h>
  26
  27 #include <asm/mips-boards/prom.h>
  28
  29 /*#define DEBUG*/
  30
  31 enum simmem_memtypes {
  32         simmem_reserved = 0,
  33         simmem_free,
  34 };
  35 struct prom_pmemblock mdesc[PROM_MAX_PMEMBLOCKS];
  36
  37 #ifdef DEBUG
  38 static char *mtypes[3] = {
  39         "SIM reserved memory",
  40         "SIM free memory",
  41 };
  42 #endif
  43
  44 struct prom_pmemblock * __init prom_getmdesc(void)
  45 {
  46         unsigned int memsize;
  47
  48         memsize = 0x02000000;
  49         pr_info("Setting default memory size 0x%08x\n", memsize);
  50
  51         memset(mdesc, 0, sizeof(mdesc));
  52
  53         mdesc[0].type = simmem_reserved;
  54         mdesc[0].base = 0x00000000;
  55         mdesc[0].size = 0x00001000;
  56
  57         mdesc[1].type = simmem_free;
  58         mdesc[1].base = 0x00001000;
  59         mdesc[1].size = 0x000ff000;
  60
  61         mdesc[2].type = simmem_reserved;
  62         mdesc[2].base = 0x00100000;
  63         mdesc[2].size = CPHYSADDR(PFN_ALIGN(&_end)) - mdesc[2].base;
  64
  65         mdesc[3].type = simmem_free;
  66         mdesc[3].base = CPHYSADDR(PFN_ALIGN(&_end));
  67         mdesc[3].size = memsize - mdesc[3].base;
  68
  69         return &mdesc[0];
  70 }
  71
  72 static int __init prom_memtype_classify(unsigned int type)
  73 {
  74         switch (type) {
  75         case simmem_free:
  76                 return BOOT_MEM_RAM;
  77         case simmem_reserved:
  78         default:
  79                 return BOOT_MEM_RESERVED;
  80         }
  81 }
  82
  83 void __init prom_meminit(void)
  84 {
  85         struct prom_pmemblock *p;
  86
  87         p = prom_getmdesc();
  88
  89         while (p->size) {
  90                 long type;
  91                 unsigned long base, size;
  92
  93                 type = prom_memtype_classify(p->type);
  94                 base = p->base;
  95                 size = p->size;
  96
  97                 add_memory_region(base, size, type);
  98                 p++;
  99         }
 100 }
 101
 102 void __init prom_free_prom_memory(void)
 103 {
 104         int i;
 105         unsigned long addr;
 106
 107         for (i = 0; i < boot_mem_map.nr_map; i++) {
 108                 if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
 109                         continue;
 110
 111                 addr = boot_mem_map.map[i].addr;
 112                 free_init_pages("prom memory",
 113                                 addr, addr + boot_mem_map.map[i].size);
 114         }
 115 }