1*708d4f09SSam Ravnborg /* 2*708d4f09SSam Ravnborg * init.c: Initialize internal variables used by the PROM 3*708d4f09SSam Ravnborg * library functions. 4*708d4f09SSam Ravnborg * 5*708d4f09SSam Ravnborg * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 6*708d4f09SSam Ravnborg * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 7*708d4f09SSam Ravnborg */ 8*708d4f09SSam Ravnborg 9*708d4f09SSam Ravnborg #include <linux/kernel.h> 10*708d4f09SSam Ravnborg #include <linux/init.h> 11*708d4f09SSam Ravnborg 12*708d4f09SSam Ravnborg #include <asm/openprom.h> 13*708d4f09SSam Ravnborg #include <asm/oplib.h> 14*708d4f09SSam Ravnborg 15*708d4f09SSam Ravnborg struct linux_romvec *romvec; 16*708d4f09SSam Ravnborg enum prom_major_version prom_vers; 17*708d4f09SSam Ravnborg unsigned int prom_rev, prom_prev; 18*708d4f09SSam Ravnborg 19*708d4f09SSam Ravnborg /* The root node of the prom device tree. */ 20*708d4f09SSam Ravnborg int prom_root_node; 21*708d4f09SSam Ravnborg 22*708d4f09SSam Ravnborg /* Pointer to the device tree operations structure. */ 23*708d4f09SSam Ravnborg struct linux_nodeops *prom_nodeops; 24*708d4f09SSam Ravnborg 25*708d4f09SSam Ravnborg /* You must call prom_init() before you attempt to use any of the 26*708d4f09SSam Ravnborg * routines in the prom library. It returns 0 on success, 1 on 27*708d4f09SSam Ravnborg * failure. It gets passed the pointer to the PROM vector. 28*708d4f09SSam Ravnborg */ 29*708d4f09SSam Ravnborg 30*708d4f09SSam Ravnborg extern void prom_meminit(void); 31*708d4f09SSam Ravnborg extern void prom_ranges_init(void); 32*708d4f09SSam Ravnborg 33*708d4f09SSam Ravnborg void __init prom_init(struct linux_romvec *rp) 34*708d4f09SSam Ravnborg { 35*708d4f09SSam Ravnborg romvec = rp; 36*708d4f09SSam Ravnborg 37*708d4f09SSam Ravnborg switch(romvec->pv_romvers) { 38*708d4f09SSam Ravnborg case 0: 39*708d4f09SSam Ravnborg prom_vers = PROM_V0; 40*708d4f09SSam Ravnborg break; 41*708d4f09SSam Ravnborg case 2: 42*708d4f09SSam Ravnborg prom_vers = PROM_V2; 43*708d4f09SSam Ravnborg break; 44*708d4f09SSam Ravnborg case 3: 45*708d4f09SSam Ravnborg prom_vers = PROM_V3; 46*708d4f09SSam Ravnborg break; 47*708d4f09SSam Ravnborg default: 48*708d4f09SSam Ravnborg prom_printf("PROMLIB: Bad PROM version %d\n", 49*708d4f09SSam Ravnborg romvec->pv_romvers); 50*708d4f09SSam Ravnborg prom_halt(); 51*708d4f09SSam Ravnborg break; 52*708d4f09SSam Ravnborg }; 53*708d4f09SSam Ravnborg 54*708d4f09SSam Ravnborg prom_rev = romvec->pv_plugin_revision; 55*708d4f09SSam Ravnborg prom_prev = romvec->pv_printrev; 56*708d4f09SSam Ravnborg prom_nodeops = romvec->pv_nodeops; 57*708d4f09SSam Ravnborg 58*708d4f09SSam Ravnborg prom_root_node = prom_getsibling(0); 59*708d4f09SSam Ravnborg if((prom_root_node == 0) || (prom_root_node == -1)) 60*708d4f09SSam Ravnborg prom_halt(); 61*708d4f09SSam Ravnborg 62*708d4f09SSam Ravnborg if((((unsigned long) prom_nodeops) == 0) || 63*708d4f09SSam Ravnborg (((unsigned long) prom_nodeops) == -1)) 64*708d4f09SSam Ravnborg prom_halt(); 65*708d4f09SSam Ravnborg 66*708d4f09SSam Ravnborg prom_meminit(); 67*708d4f09SSam Ravnborg 68*708d4f09SSam Ravnborg prom_ranges_init(); 69*708d4f09SSam Ravnborg 70*708d4f09SSam Ravnborg printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n", 71*708d4f09SSam Ravnborg romvec->pv_romvers, prom_rev); 72*708d4f09SSam Ravnborg 73*708d4f09SSam Ravnborg /* Initialization successful. */ 74*708d4f09SSam Ravnborg return; 75*708d4f09SSam Ravnborg } 76