/* $Id: init.c,v 1.9 1996/12/18 06:46:55 tridge Exp $ * init.c:  Initialize internal variables used by the PROM *          library functions. * * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) */#include <linux/config.h>#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){#if CONFIG_AP1000	extern struct linux_romvec *ap_prom_init(void);	rp = ap_prom_init();#endif	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;	case 42: /* why not :-) */		prom_vers = PROM_AP1000;		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;}