1 /* $Id: init.c,v 1.9 1996/12/18 06:46:55 tridge 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 */ 7 8 #include <linux/kernel.h> 9 #include <linux/init.h> 10 11 #include <asm/openprom.h> 12 #include <asm/oplib.h> 13 14 struct linux_romvec *romvec; 15 enum prom_major_version prom_vers; 16 unsigned int prom_rev, prom_prev; 17 18 /* The root node of the prom device tree. */ 19 int prom_root_node; 20 21 /* Pointer to the device tree operations structure. */ 22 struct 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 29 extern void prom_meminit(void); 30 extern void prom_ranges_init(void); 31 32 void __init prom_init(struct linux_romvec *rp) 33 { 34 #ifdef CONFIG_AP1000 35 extern struct linux_romvec *ap_prom_init(void); 36 rp = ap_prom_init(); 37 #endif 38 39 romvec = rp; 40 #ifndef CONFIG_SUN3 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 case 4: 52 prom_vers = PROM_P1275; 53 prom_printf("PROMLIB: Sun IEEE Prom not supported yet\n"); 54 prom_halt(); 55 break; 56 case 42: /* why not :-) */ 57 prom_vers = PROM_AP1000; 58 break; 59 60 default: 61 prom_printf("PROMLIB: Bad PROM version %d\n", 62 romvec->pv_romvers); 63 prom_halt(); 64 break; 65 }; 66 67 prom_rev = romvec->pv_plugin_revision; 68 prom_prev = romvec->pv_printrev; 69 prom_nodeops = romvec->pv_nodeops; 70 71 prom_root_node = prom_getsibling(0); 72 if((prom_root_node == 0) || (prom_root_node == -1)) 73 prom_halt(); 74 75 if((((unsigned long) prom_nodeops) == 0) || 76 (((unsigned long) prom_nodeops) == -1)) 77 prom_halt(); 78 79 prom_meminit(); 80 81 prom_ranges_init(); 82 #endif 83 // printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n", 84 // romvec->pv_romvers, prom_rev); 85 86 /* Initialization successful. */ 87 return; 88 } 89