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/sun4prom.h>
  14 #include <asm/oplib.h>
  15 #include <asm/page.h>
  16
  17 static int __init prom_meminit_v0(void)
  18 {
  19         struct linux_mlist_v0 *p;
  20         int index;
  21
  22         index = 0;
  23         for (p = *(romvec->pv_v0mem.v0_available); p; p = p->theres_more) {
  24                 sp_banks[index].base_addr = (unsigned long) p->start_adr;
  25                 sp_banks[index].num_bytes = p->num_bytes;
  26                 index++;
  27         }
  28
  29         return index;
  30 }
  31
  32 static int __init prom_meminit_v2(void)
  33 {
  34         struct linux_prom_registers reg[64];
  35         int node, 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
  49 static int __init prom_meminit_sun4(void)
  50 {
  51 #ifdef CONFIG_SUN4
  52         sp_banks[0].base_addr = 0;
  53         sp_banks[0].num_bytes = *(sun4_romvec->memoryavail);
  54 #endif
  55         return 1;
  56 }
  57
  58 static int sp_banks_cmp(const void *a, const void *b)
  59 {
  60         const struct sparc_phys_banks *x = a, *y = b;
  61
  62         if (x->base_addr > y->base_addr)
  63                 return 1;
  64         if (x->base_addr < y->base_addr)
  65                 return -1;
  66         return 0;
  67 }
  68
  69 /* Initialize the memory lists based upon the prom version. */
  70 void __init prom_meminit(void)
  71 {
  72         int i, num_ents = 0;
  73
  74         switch (prom_vers) {
  75         case PROM_V0:
  76                 num_ents = prom_meminit_v0();
  77                 break;
  78
  79         case PROM_V2:
  80         case PROM_V3:
  81                 num_ents = prom_meminit_v2();
  82                 break;
  83
  84         case PROM_SUN4:
  85                 num_ents = prom_meminit_sun4();
  86                 break;
  87
  88         default:
  89                 break;
  90         }
  91         sort(sp_banks, num_ents, sizeof(struct sparc_phys_banks),
  92              sp_banks_cmp, NULL);
  93
  94         /* Sentinel.  */
  95         sp_banks[num_ents].base_addr = 0xdeadbeef;
  96         sp_banks[num_ents].num_bytes = 0;
  97
  98         for (i = 0; i < num_ents; i++)
  99                 sp_banks[i].num_bytes &= PAGE_MASK;
 100 }