release/src-rt-6.x.4708/linux/linux-2.6.36/arch/sparc/prom/init_32.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 #include <linux/module.h>
  12
  13 #include <asm/openprom.h>
  14 #include <asm/oplib.h>
  15
  16 struct linux_romvec *romvec;
  17 EXPORT_SYMBOL(romvec);
  18
  19 enum prom_major_version prom_vers;
  20 unsigned int prom_rev, prom_prev;
  21
  22 /* The root node of the prom device tree. */
  23 int prom_root_node;
  24 EXPORT_SYMBOL(prom_root_node);
  25
  26 /* Pointer to the device tree operations structure. */
  27 struct 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.  It returns 0 on success, 1 on
  31  * failure.  It gets passed the pointer to the PROM vector.
  32  */
  33
  34 extern void prom_meminit(void);
  35 extern void prom_ranges_init(void);
  36
  37 void __init prom_init(struct linux_romvec *rp)
  38 {
  39         romvec = rp;
  40
  41         switch(romvec->pv_romvers) {
  42         case 0:
  43                 prom_vers = PROM_V0;
  44                 break;
  45         case 2:
  46                 prom_vers = PROM_V2;
  47                 break;
  48         case 3:
  49                 prom_vers = PROM_V3;
  50                 break;
  51         default:
  52                 prom_printf("PROMLIB: Bad PROM version %d\n",
  53                             romvec->pv_romvers);
  54                 prom_halt();
  55                 break;
  56         };
  57
  58         prom_rev = romvec->pv_plugin_revision;
  59         prom_prev = romvec->pv_printrev;
  60         prom_nodeops = romvec->pv_nodeops;
  61
  62         prom_root_node = prom_getsibling(0);
  63         if((prom_root_node == 0) || (prom_root_node == -1))
  64                 prom_halt();
  65
  66         if((((unsigned long) prom_nodeops) == 0) ||
  67            (((unsigned long) prom_nodeops) == -1))
  68                 prom_halt();
  69
  70         prom_meminit();
  71
  72         prom_ranges_init();
  73
  74         printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n",
  75                romvec->pv_romvers, prom_rev);
  76
  77         /* Initialization successful. */
  78 }