arch/sparc/prom/init_32.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * init.c:  Initialize internal variables used by the PROM
   4  *          library functions.
   5  *
   6  * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
   7  * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <linux/module.h>
  13
  14 #include <asm/openprom.h>
  15 #include <asm/oplib.h>
  16
  17 struct linux_romvec *romvec;
  18 EXPORT_SYMBOL(romvec);
  19
  20 enum prom_major_version prom_vers;
  21 unsigned int prom_rev, prom_prev;
  22
  23 /* The root node of the prom device tree. */
  24 phandle prom_root_node;
  25 EXPORT_SYMBOL(prom_root_node);
  26
  27 /* Pointer to the device tree operations structure. */
  28 struct linux_nodeops *prom_nodeops;
  29
  30 /* You must call prom_init() before you attempt to use any of the
  31  * routines in the prom library.
  32  * It gets passed the pointer to the PROM vector.
  33  */
  34
  35 void __init prom_init(struct linux_romvec *rp)
  36 {
  37         romvec = rp;
  38
  39         switch(romvec->pv_romvers) {
  40         case 0:
  41                 prom_vers = PROM_V0;
  42                 break;
  43         case 2:
  44                 prom_vers = PROM_V2;
  45                 break;
  46         case 3:
  47                 prom_vers = PROM_V3;
  48                 break;
  49         default:
  50                 prom_printf("PROMLIB: Bad PROM version %d\n",
  51                             romvec->pv_romvers);
  52                 prom_halt();
  53                 break;
  54         }
  55
  56         prom_rev = romvec->pv_plugin_revision;
  57         prom_prev = romvec->pv_printrev;
  58         prom_nodeops = romvec->pv_nodeops;
  59
  60         prom_root_node = prom_getsibling(0);
  61         if ((prom_root_node == 0) || ((s32)prom_root_node == -1))
  62                 prom_halt();
  63
  64         if((((unsigned long) prom_nodeops) == 0) ||
  65            (((unsigned long) prom_nodeops) == -1))
  66                 prom_halt();
  67
  68         prom_meminit();
  69
  70         prom_ranges_init();
  71
  72         printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n",
  73                romvec->pv_romvers, prom_rev);
  74
  75         /* Initialization successful. */
  76 }