LXR linux/arch/sparc/prom/memory.c

   1/* memory.c: Prom routine for acquiring various bits of information
   2 *           about RAM on the machine, both virtual and physical.
   3 *
   4 * Copyright (C) 1995, 2008 David S. Miller (davem@davemloft.net)
   5 * Copyright (C) 1997 Michael A. Griffith (grif@acm.org)
   6 */
   7
   8#include <linux/kernel.h>
   9#include <linux/sort.h>
  10#include <linux/init.h>
  11
  12#include <asm/openprom.h>
  13#include <asm/oplib.h>
  14#include <asm/page.h>
  15
  16static int __init prom_meminit_v0(void)
  17{
  18        struct linux_mlist_v0 *p;
  19        int index;
  20
  21        index = 0;
  22        for (p = *(romvec->pv_v0mem.v0_available); p; p = p->theres_more) {
  23                sp_banks[index].base_addr = (unsigned long) p->start_adr;
  24                sp_banks[index].num_bytes = p->num_bytes;
  25                index++;
  26        }
  27
  28        return index;
  29}
  30
  31static int __init prom_meminit_v2(void)
  32{
  33        struct linux_prom_registers reg[64];
  34        phandle node;
  35        int size, num_ents, i;
  36
  37        node = prom_searchsiblings(prom_getchild(prom_root_node), "memory");
  38        size = prom_getproperty(node, "available", (char *) reg, sizeof(reg));
  39        num_ents = size / sizeof(struct linux_prom_registers);
  40
  41        for (i = 0; i < num_ents; i++) {
  42                sp_banks[i].base_addr = reg[i].phys_addr;
  43                sp_banks[i].num_bytes = reg[i].reg_size;
  44        }
  45
  46        return num_ents;
  47}
  48
  49static int sp_banks_cmp(const void *a, const void *b)
  50{
  51        const struct sparc_phys_banks *x = a, *y = b;
  52
  53        if (x->base_addr > y->base_addr)
  54                return 1;
  55        if (x->base_addr < y->base_addr)
  56                return -1;
  57        return 0;
  58}
  59
  60/* Initialize the memory lists based upon the prom version. */
  61void __init prom_meminit(void)
  62{
  63        int i, num_ents = 0;
  64
  65        switch (prom_vers) {
  66        case PROM_V0:
  67                num_ents = prom_meminit_v0();
  68                break;
  69
  70        case PROM_V2:
  71        case PROM_V3:
  72                num_ents = prom_meminit_v2();
  73                break;
  74
  75        default:
  76                break;
  77        }
  78        sort(sp_banks, num_ents, sizeof(struct sparc_phys_banks),
  79             sp_banks_cmp, NULL);
  80
  81        /* Sentinel.  */
  82        sp_banks[num_ents].base_addr = 0xdeadbeef;
  83        sp_banks[num_ents].num_bytes = 0;
  84
  85        for (i = 0; i < num_ents; i++)
  86                sp_banks[i].num_bytes &= PAGE_MASK;
  87}
  88