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sim_mem.c

/*
 * Copyright (C) 2005 MIPS Technologies, Inc.  All rights reserved.
 *
 *  This program is free software; you can distribute it and/or modify it
 *  under the terms of the GNU General Public License (Version 2) as
 *  published by the Free Software Foundation.
 *
 *  This program is distributed in the hope it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this program; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 */
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/pfn.h>

#include <asm/bootinfo.h>
#include <asm/page.h>
#include <asm/sections.h>

#include <asm/mips-boards/prom.h>

/*#define DEBUG*/

enum simmem_memtypes {
      simmem_reserved = 0,
      simmem_free,
};
struct prom_pmemblock mdesc[PROM_MAX_PMEMBLOCKS];

#ifdef DEBUG
static char *mtypes[3] = {
      "SIM reserved memory",
      "SIM free memory",
};
#endif

struct prom_pmemblock * __init prom_getmdesc(void)
{
      unsigned int memsize;

      memsize = 0x02000000;
      pr_info("Setting default memory size 0x%08x\n", memsize);

      memset(mdesc, 0, sizeof(mdesc));

      mdesc[0].type = simmem_reserved;
      mdesc[0].base = 0x00000000;
      mdesc[0].size = 0x00001000;

      mdesc[1].type = simmem_free;
      mdesc[1].base = 0x00001000;
      mdesc[1].size = 0x000ff000;

      mdesc[2].type = simmem_reserved;
      mdesc[2].base = 0x00100000;
      mdesc[2].size = CPHYSADDR(PFN_ALIGN(&_end)) - mdesc[2].base;

      mdesc[3].type = simmem_free;
      mdesc[3].base = CPHYSADDR(PFN_ALIGN(&_end));
      mdesc[3].size = memsize - mdesc[3].base;

      return &mdesc[0];
}

static int __init prom_memtype_classify(unsigned int type)
{
      switch (type) {
      case simmem_free:
            return BOOT_MEM_RAM;
      case simmem_reserved:
      default:
            return BOOT_MEM_RESERVED;
      }
}

void __init prom_meminit(void)
{
      struct prom_pmemblock *p;

      p = prom_getmdesc();

      while (p->size) {
            long type;
            unsigned long base, size;

            type = prom_memtype_classify(p->type);
            base = p->base;
            size = p->size;

            add_memory_region(base, size, type);
            p++;
      }
}

void __init prom_free_prom_memory(void)
{
      int i;
      unsigned long addr;

      for (i = 0; i < boot_mem_map.nr_map; i++) {
            if (boot_mem_map.map[i].type != BOOT_MEM_ROM_DATA)
                  continue;

            addr = boot_mem_map.map[i].addr;
            free_init_pages("prom memory",
                        addr, addr + boot_mem_map.map[i].size);
      }
}

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