1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * init.c: Initialize internal variables used by the PROM 4 * library functions. 5 * 6 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 7 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/init.h> 12 #include <linux/module.h> 13 14 #include <asm/openprom.h> 15 #include <asm/oplib.h> 16 17 struct linux_romvec *romvec; 18 EXPORT_SYMBOL(romvec); 19 20 enum prom_major_version prom_vers; 21 unsigned int prom_rev, prom_prev; 22 23 /* The root node of the prom device tree. */ 24 phandle prom_root_node; 25 EXPORT_SYMBOL(prom_root_node); 26 27 /* Pointer to the device tree operations structure. */ 28 struct linux_nodeops *prom_nodeops; 29 30 /* You must call prom_init() before you attempt to use any of the 31 * routines in the prom library. 32 * It gets passed the pointer to the PROM vector. 33 */ 34 35 void __init prom_init(struct linux_romvec *rp) 36 { 37 romvec = rp; 38 39 switch(romvec->pv_romvers) { 40 case 0: 41 prom_vers = PROM_V0; 42 break; 43 case 2: 44 prom_vers = PROM_V2; 45 break; 46 case 3: 47 prom_vers = PROM_V3; 48 break; 49 default: 50 prom_printf("PROMLIB: Bad PROM version %d\n", 51 romvec->pv_romvers); 52 prom_halt(); 53 break; 54 } 55 56 prom_rev = romvec->pv_plugin_revision; 57 prom_prev = romvec->pv_printrev; 58 prom_nodeops = romvec->pv_nodeops; 59 60 prom_root_node = prom_getsibling(0); 61 if ((prom_root_node == 0) || ((s32)prom_root_node == -1)) 62 prom_halt(); 63 64 if((((unsigned long) prom_nodeops) == 0) || 65 (((unsigned long) prom_nodeops) == -1)) 66 prom_halt(); 67 68 prom_meminit(); 69 70 prom_ranges_init(); 71 72 printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n", 73 romvec->pv_romvers, prom_rev); 74 75 /* Initialization successful. */ 76 } 77