1708d4f09SSam Ravnborg /* 2708d4f09SSam Ravnborg * init.c: Initialize internal variables used by the PROM 3708d4f09SSam Ravnborg * library functions. 4708d4f09SSam Ravnborg * 5708d4f09SSam Ravnborg * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 6708d4f09SSam Ravnborg * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 7708d4f09SSam Ravnborg */ 8708d4f09SSam Ravnborg 9708d4f09SSam Ravnborg #include <linux/kernel.h> 10708d4f09SSam Ravnborg #include <linux/init.h> 11708d4f09SSam Ravnborg 12708d4f09SSam Ravnborg #include <asm/openprom.h> 13708d4f09SSam Ravnborg #include <asm/oplib.h> 14708d4f09SSam Ravnborg 15708d4f09SSam Ravnborg struct linux_romvec *romvec; 16708d4f09SSam Ravnborg enum prom_major_version prom_vers; 17708d4f09SSam Ravnborg unsigned int prom_rev, prom_prev; 18708d4f09SSam Ravnborg 19708d4f09SSam Ravnborg /* The root node of the prom device tree. */ 20708d4f09SSam Ravnborg int prom_root_node; 21708d4f09SSam Ravnborg 22708d4f09SSam Ravnborg /* Pointer to the device tree operations structure. */ 23708d4f09SSam Ravnborg struct linux_nodeops *prom_nodeops; 24708d4f09SSam Ravnborg 25708d4f09SSam Ravnborg /* You must call prom_init() before you attempt to use any of the 26708d4f09SSam Ravnborg * routines in the prom library. It returns 0 on success, 1 on 27708d4f09SSam Ravnborg * failure. It gets passed the pointer to the PROM vector. 28708d4f09SSam Ravnborg */ 29708d4f09SSam Ravnborg 30708d4f09SSam Ravnborg extern void prom_meminit(void); 31708d4f09SSam Ravnborg extern void prom_ranges_init(void); 32708d4f09SSam Ravnborg 33708d4f09SSam Ravnborg void __init prom_init(struct linux_romvec *rp) 34708d4f09SSam Ravnborg { 35708d4f09SSam Ravnborg romvec = rp; 36708d4f09SSam Ravnborg 37708d4f09SSam Ravnborg switch(romvec->pv_romvers) { 38708d4f09SSam Ravnborg case 0: 39708d4f09SSam Ravnborg prom_vers = PROM_V0; 40708d4f09SSam Ravnborg break; 41708d4f09SSam Ravnborg case 2: 42708d4f09SSam Ravnborg prom_vers = PROM_V2; 43708d4f09SSam Ravnborg break; 44708d4f09SSam Ravnborg case 3: 45708d4f09SSam Ravnborg prom_vers = PROM_V3; 46708d4f09SSam Ravnborg break; 47708d4f09SSam Ravnborg default: 48708d4f09SSam Ravnborg prom_printf("PROMLIB: Bad PROM version %d\n", 49708d4f09SSam Ravnborg romvec->pv_romvers); 50708d4f09SSam Ravnborg prom_halt(); 51708d4f09SSam Ravnborg break; 52708d4f09SSam Ravnborg }; 53708d4f09SSam Ravnborg 54708d4f09SSam Ravnborg prom_rev = romvec->pv_plugin_revision; 55708d4f09SSam Ravnborg prom_prev = romvec->pv_printrev; 56708d4f09SSam Ravnborg prom_nodeops = romvec->pv_nodeops; 57708d4f09SSam Ravnborg 58708d4f09SSam Ravnborg prom_root_node = prom_getsibling(0); 59708d4f09SSam Ravnborg if((prom_root_node == 0) || (prom_root_node == -1)) 60708d4f09SSam Ravnborg prom_halt(); 61708d4f09SSam Ravnborg 62708d4f09SSam Ravnborg if((((unsigned long) prom_nodeops) == 0) || 63708d4f09SSam Ravnborg (((unsigned long) prom_nodeops) == -1)) 64708d4f09SSam Ravnborg prom_halt(); 65708d4f09SSam Ravnborg 66708d4f09SSam Ravnborg prom_meminit(); 67708d4f09SSam Ravnborg 68708d4f09SSam Ravnborg prom_ranges_init(); 69708d4f09SSam Ravnborg 70708d4f09SSam Ravnborg printk("PROMLIB: Sun Boot Prom Version %d Revision %d\n", 71708d4f09SSam Ravnborg romvec->pv_romvers, prom_rev); 72708d4f09SSam Ravnborg 73708d4f09SSam Ravnborg /* Initialization successful. */ 74708d4f09SSam Ravnborg return; 75708d4f09SSam Ravnborg } 76