LXR linux/arch/sparc/prom/init

   1/*
   2 * init.c:  Initialize internal variables used by the PROM
   3 *          library functions.
   4 *
   5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   6 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   7 */
   8
   9#include <linux/kernel.h>
  10#include <linux/init.h>
  11#include <linux/module.h>
  12
  13#include <asm/openprom.h>
  14#include <asm/oplib.h>
  15
  16struct linux_romvec *romvec;
  17EXPORT_SYMBOL(romvec);
  18
  19enum prom_major_version prom_vers;
  20unsigned int prom_rev, prom_prev;
  21
  22/* The root node of the prom device tree. */
  23phandle prom_root_node;
  24EXPORT_SYMBOL(prom_root_node);
  25
  26/* Pointer to the device tree operations structure. */
  27struct linux_nodeops *prom_nodeops;
  28
  29/* You must call prom_init() before you attempt to use any of the
  30 * routines in the prom library.
  31 * It gets passed the pointer to the PROM vector.
  32 */
  33
  34void __init prom_init(struct linux_romvec *rp)
  35{
  36        romvec = rp;
  37
  38        switch(romvec->pv_romvers) {
  39        case 0:
  40                prom_vers = PROM_V0;
  41                break;
  42        case 2:
  43                prom_vers = PROM_V2;
  44                break;
  45        case 3:
  46                prom_vers = PROM_V3;
  47                break;
  48        default:
  49                prom_printf("PROMLIB: Bad PROM version %d\n",
  50                            romvec->pv_romvers);
  51                prom_halt();
  52                break;
  53        }
  54
  55        prom_rev = romvec->pv_plugin_revision;
  56        prom_prev = romvec->pv_printrev;
  57        prom_nodeops = romvec->pv_nodeops;
  58
  59        prom_root_node = prom_getsibling(0);
  60        if ((prom_root_node == 0) || ((s32)prom_root_node == -1))
  61                prom_halt();
  62
  63        if((((unsigned long) prom_nodeops) == 0) || 
  64           (((unsigned long) prom_nodeops) == -1))
  65                prom_halt();
  66
  67        prom_meminit();
  68
  69        prom_ranges_init();
  70
  71        printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n",
  72               romvec->pv_romvers, prom_rev);
  73
  74        /* Initialization successful. */
  75}
  76