1/* $Id: init.c,v 1.1.1.1 2007/08/03 18:52:18 Exp $ 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 12#include <asm/openprom.h> 13#include <asm/oplib.h> 14#include <asm/sun4prom.h> 15 16struct linux_romvec *romvec; 17enum prom_major_version prom_vers; 18unsigned int prom_rev, prom_prev; 19linux_sun4_romvec *sun4_romvec; 20 21/* The root node of the prom device tree. */ 22int prom_root_node; 23 24int prom_stdin, prom_stdout; 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#ifdef CONFIG_SUN4 40 extern struct linux_romvec *sun4_prom_init(void); 41 rp = sun4_prom_init(); 42#endif 43 romvec = rp; 44 45 switch(romvec->pv_romvers) { 46 case 0: 47 prom_vers = PROM_V0; 48 break; 49 case 2: 50 prom_vers = PROM_V2; 51 break; 52 case 3: 53 prom_vers = PROM_V3; 54 break; 55 case 40: 56 prom_vers = PROM_SUN4; 57 break; 58 default: 59 prom_printf("PROMLIB: Bad PROM version %d\n", 60 romvec->pv_romvers); 61 prom_halt(); 62 break; 63 }; 64 65 prom_rev = romvec->pv_plugin_revision; 66 prom_prev = romvec->pv_printrev; 67 prom_nodeops = romvec->pv_nodeops; 68 69 prom_root_node = prom_getsibling(0); 70 if((prom_root_node == 0) || (prom_root_node == -1)) 71 prom_halt(); 72 73 if((((unsigned long) prom_nodeops) == 0) || 74 (((unsigned long) prom_nodeops) == -1)) 75 prom_halt(); 76 77 if(prom_vers == PROM_V2 || prom_vers == PROM_V3) { 78 prom_stdout = *romvec->pv_v2bootargs.fd_stdout; 79 prom_stdin = *romvec->pv_v2bootargs.fd_stdin; 80 } 81 82 prom_meminit(); 83 84 prom_ranges_init(); 85 86#ifndef CONFIG_SUN4 87 /* SUN4 prints this in sun4_prom_init */ 88 printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n", 89 romvec->pv_romvers, prom_rev); 90#endif 91 92 /* Initialization successful. */ 93 return; 94} 95