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 */ 7 8#include <linux/kernel.h> 9#include <linux/init.h> 10 11#include <asm/openprom.h> 12#include <asm/oplib.h> 13 14struct linux_romvec *romvec; 15enum prom_major_version prom_vers; 16unsigned int prom_rev, prom_prev; 17 18/* The root node of the prom device tree. */ 19int prom_root_node; 20 21/* Pointer to the device tree operations structure. */ 22struct linux_nodeops *prom_nodeops; 23 24/* You must call prom_init() before you attempt to use any of the 25 * routines in the prom library. It returns 0 on success, 1 on 26 * failure. It gets passed the pointer to the PROM vector. 27 */ 28 29extern void prom_meminit(void); 30extern void prom_ranges_init(void); 31 32void __init prom_init(struct linux_romvec *rp) 33{ 34 romvec = rp; 35#ifndef CONFIG_SUN3 36 switch(romvec->pv_romvers) { 37 case 0: 38 prom_vers = PROM_V0; 39 break; 40 case 2: 41 prom_vers = PROM_V2; 42 break; 43 case 3: 44 prom_vers = PROM_V3; 45 break; 46 case 4: 47 prom_vers = PROM_P1275; 48 prom_printf("PROMLIB: Sun IEEE Prom not supported yet\n"); 49 prom_halt(); 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#endif 74// printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n", 75// romvec->pv_romvers, prom_rev); 76 77 /* Initialization successful. */ 78 return; 79} 80