init_32.c

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/*
 * init.c:  Initialize internal variables used by the PROM
 *          library functions.
 *
 * Copyright (C) 1995 David S. Miller ([email protected])
 * Copyright (C) 1998 Jakub Jelinek ([email protected])
 */

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

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

struct linux_romvec *romvec;
EXPORT_SYMBOL(romvec);

enum prom_major_version prom_vers;
unsigned int prom_rev, prom_prev;

/* The root node of the prom device tree. */
phandle prom_root_node;
EXPORT_SYMBOL(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 gets passed the pointer to the PROM vector.
 */

void __init prom_init(struct linux_romvec *rp)
{
    romvec = rp;

    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;
    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) || ((s32)prom_root_node == -1))
        prom_halt();

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

    prom_meminit();

    prom_ranges_init();

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

    /* Initialization successful. */
}