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memory.c

/* memory.c: Prom routine for acquiring various bits of information
 *           about RAM on the machine, both virtual and physical.
 *
 * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
 * Copyright (C) 1997 Michael A. Griffith (grif@acm.org)
 */

#include <linux/kernel.h>
#include <linux/sort.h>
#include <linux/init.h>

#include <asm/openprom.h>
#include <asm/sun4prom.h>
#include <asm/oplib.h>
#include <asm/page.h>

static int __init prom_meminit_v0(void)
{
      struct linux_mlist_v0 *p;
      int index;

      index = 0;
      for (p = *(romvec->pv_v0mem.v0_available); p; p = p->theres_more) {
            sp_banks[index].base_addr = (unsigned long) p->start_adr;
            sp_banks[index].num_bytes = p->num_bytes;
            index++;
      }

      return index;
}

static int __init prom_meminit_v2(void)
{
      struct linux_prom_registers reg[64];
      int node, size, num_ents, i;

      node = prom_searchsiblings(prom_getchild(prom_root_node), "memory");
      size = prom_getproperty(node, "available", (char *) reg, sizeof(reg));
      num_ents = size / sizeof(struct linux_prom_registers);

      for (i = 0; i < num_ents; i++) {
            sp_banks[i].base_addr = reg[i].phys_addr;
            sp_banks[i].num_bytes = reg[i].reg_size;
      }

      return num_ents;
}

static int __init prom_meminit_sun4(void)
{
#ifdef CONFIG_SUN4
      sp_banks[0].base_addr = 0;
      sp_banks[0].num_bytes = *(sun4_romvec->memoryavail);
#endif
      return 1;
}

static int sp_banks_cmp(const void *a, const void *b)
{
      const struct sparc_phys_banks *x = a, *y = b;

      if (x->base_addr > y->base_addr)
            return 1;
      if (x->base_addr < y->base_addr)
            return -1;
      return 0;
}

/* Initialize the memory lists based upon the prom version. */
void __init prom_meminit(void)
{
      int i, num_ents = 0;

      switch (prom_vers) {
      case PROM_V0:
            num_ents = prom_meminit_v0();
            break;

      case PROM_V2:
      case PROM_V3:
            num_ents = prom_meminit_v2();
            break;

      case PROM_SUN4:
            num_ents = prom_meminit_sun4();
            break;

      default:
            break;
      }
      sort(sp_banks, num_ents, sizeof(struct sparc_phys_banks),
           sp_banks_cmp, NULL);

      /* Sentinel.  */
      sp_banks[num_ents].base_addr = 0xdeadbeef;
      sp_banks[num_ents].num_bytes = 0;

      for (i = 0; i < num_ents; i++)
            sp_banks[i].num_bytes &= PAGE_MASK;
}

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