LXR linux/arch/sparc/prom/init

   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
  17struct linux_romvec *romvec;
  18EXPORT_SYMBOL(romvec);
  19
  20enum prom_major_version prom_vers;
  21unsigned int prom_rev, prom_prev;
  22
  23/* The root node of the prom device tree. */
  24phandle prom_root_node;
  25EXPORT_SYMBOL(prom_root_node);
  26
  27/* Pointer to the device tree operations structure. */
  28struct 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
  35void __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}
  77