arch/sparc/prom/init.c

   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
  12 #include <asm/openprom.h>
  13 #include <asm/oplib.h>
  14
  15 struct linux_romvec *romvec;
  16 enum prom_major_version prom_vers;
  17 unsigned int prom_rev, prom_prev;
  18
  19 /* The root node of the prom device tree. */
  20 int prom_root_node;
  21
  22 /* Pointer to the device tree operations structure. */
  23 struct linux_nodeops *prom_nodeops;
  24
  25 /* You must call prom_init() before you attempt to use any of the
  26  * routines in the prom library.  It returns 0 on success, 1 on
  27  * failure.  It gets passed the pointer to the PROM vector.
  28  */
  29
  30 extern void prom_meminit(void);
  31 extern void prom_ranges_init(void);
  32
  33 void __init prom_init(struct linux_romvec *rp)
  34 {
  35         romvec = rp;
  36
  37         switch(romvec->pv_romvers) {
  38         case 0:
  39                 prom_vers = PROM_V0;
  40                 break;
  41         case 2:
  42                 prom_vers = PROM_V2;
  43                 break;
  44         case 3:
  45                 prom_vers = PROM_V3;
  46                 break;
  47         default:
  48                 prom_printf("PROMLIB: Bad PROM version %d\n",
  49                             romvec->pv_romvers);
  50                 prom_halt();
  51                 break;
  52         };
  53
  54         prom_rev = romvec->pv_plugin_revision;
  55         prom_prev = romvec->pv_printrev;
  56         prom_nodeops = romvec->pv_nodeops;
  57
  58         prom_root_node = prom_getsibling(0);
  59         if((prom_root_node == 0) || (prom_root_node == -1))
  60                 prom_halt();
  61
  62         if((((unsigned long) prom_nodeops) == 0) ||
  63            (((unsigned long) prom_nodeops) == -1))
  64                 prom_halt();
  65
  66         prom_meminit();
  67
  68         prom_ranges_init();
  69
  70         printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n",
  71                romvec->pv_romvers, prom_rev);
  72
  73         /* Initialization successful. */
  74         return;
  75 }