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init.c

/*
 * init.c:  Initialize internal variables used by the PROM
 *          library functions.
 *
 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
 */

#include <linux/kernel.h>
#include <linux/init.h>

#include <asm/openprom.h>
#include <asm/oplib.h>

struct linux_romvec *romvec;
enum prom_major_version prom_vers;
unsigned int prom_rev, prom_prev;

/* The root node of the prom device tree. */
int prom_root_node;

/* Pointer to the device tree operations structure. */
struct linux_nodeops *prom_nodeops;

/* You must call prom_init() before you attempt to use any of the
 * routines in the prom library.  It returns 0 on success, 1 on
 * failure.  It gets passed the pointer to the PROM vector.
 */

extern void prom_meminit(void);
extern void prom_ranges_init(void);

void __init prom_init(struct linux_romvec *rp)
{
      romvec = rp;
#ifndef CONFIG_SUN3
      switch(romvec->pv_romvers) {
      case 0:
            prom_vers = PROM_V0;
            break;
      case 2:
            prom_vers = PROM_V2;
            break;
      case 3:
            prom_vers = PROM_V3;
            break;
      case 4:
            prom_vers = PROM_P1275;
            prom_printf("PROMLIB: Sun IEEE Prom not supported yet\n");
            prom_halt();
            break;
      default:
            prom_printf("PROMLIB: Bad PROM version %d\n",
                      romvec->pv_romvers);
            prom_halt();
            break;
      };

      prom_rev = romvec->pv_plugin_revision;
      prom_prev = romvec->pv_printrev;
      prom_nodeops = romvec->pv_nodeops;

      prom_root_node = prom_getsibling(0);
      if((prom_root_node == 0) || (prom_root_node == -1))
            prom_halt();

      if((((unsigned long) prom_nodeops) == 0) ||
         (((unsigned long) prom_nodeops) == -1))
            prom_halt();

      prom_meminit();

      prom_ranges_init();
#endif
//    printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n",
//           romvec->pv_romvers, prom_rev);

      /* Initialization successful. */
      return;
}

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