1/* 2 * init.c: Initialize internal variables used by the PROM 3 * library functions. 4 * 5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 6 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 7 */ 8 9#include <linux/kernel.h> 10#include <linux/init.h> 11#include <linux/module.h> 12 13#include <asm/openprom.h> 14#include <asm/oplib.h> 15 16struct linux_romvec *romvec; 17EXPORT_SYMBOL(romvec); 18 19enum prom_major_version prom_vers; 20unsigned int prom_rev, prom_prev; 21 22/* The root node of the prom device tree. */ 23int prom_root_node; 24EXPORT_SYMBOL(prom_root_node); 25 26/* Pointer to the device tree operations structure. */ 27struct linux_nodeops *prom_nodeops; 28 29/* You must call prom_init() before you attempt to use any of the 30 * routines in the prom library. It returns 0 on success, 1 on 31 * failure. It gets passed the pointer to the PROM vector. 32 */ 33 34extern void prom_meminit(void); 35extern void prom_ranges_init(void); 36 37void __init prom_init(struct linux_romvec *rp) 38{ 39 romvec = rp; 40 41 switch(romvec->pv_romvers) { 42 case 0: 43 prom_vers = PROM_V0; 44 break; 45 case 2: 46 prom_vers = PROM_V2; 47 break; 48 case 3: 49 prom_vers = PROM_V3; 50 break; 51 default: 52 prom_printf("PROMLIB: Bad PROM version %d\n", 53 romvec->pv_romvers); 54 prom_halt(); 55 break; 56 }; 57 58 prom_rev = romvec->pv_plugin_revision; 59 prom_prev = romvec->pv_printrev; 60 prom_nodeops = romvec->pv_nodeops; 61 62 prom_root_node = prom_getsibling(0); 63 if((prom_root_node == 0) || (prom_root_node == -1)) 64 prom_halt(); 65 66 if((((unsigned long) prom_nodeops) == 0) || 67 (((unsigned long) prom_nodeops) == -1)) 68 prom_halt(); 69 70 prom_meminit(); 71 72 prom_ranges_init(); 73 74 printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n", 75 romvec->pv_romvers, prom_rev); 76 77 /* Initialization successful. */ 78} 79