/* devices.c: Initial scan of the prom device tree for important *            Sparc device nodes which we need to find. * * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) */#include <linux/config.h>#include <linux/kernel.h>#include <linux/threads.h>#include <linux/init.h>#include <linux/ioport.h>#include <linux/string.h>#include <asm/page.h>#include <asm/oplib.h>#include <asm/system.h>#include <asm/smp.h>#include <asm/spitfire.h>struct prom_cpuinfo linux_cpus[64] __initdata = { { 0 } };unsigned prom_cpu_nodes[64];int linux_num_cpus = 0;extern void cpu_probe(void);extern void central_probe(void);void __init device_scan(void){	char node_str[128];	int nd, prom_node_cpu, thismid;	int cpu_nds[64];  /* One node for each cpu */	int cpu_ctr = 0;	/* FIX ME FAST... -DaveM */	ioport_resource.end = 0xffffffffffffffffUL;	iomem_resource.end = 0xffffffffffffffffUL;	prom_getstring(prom_root_node, "device_type", node_str, sizeof(node_str));	prom_printf("Booting Linux...\n");	if(strcmp(node_str, "cpu") == 0) {		cpu_nds[0] = prom_root_node;		linux_cpus[0].prom_node = prom_root_node;		linux_cpus[0].mid = 0;		cpu_ctr++;	} else {		int scan;		scan = prom_getchild(prom_root_node);		/* prom_printf("root child is %08x\n", (unsigned) scan); */		nd = 0;		while((scan = prom_getsibling(scan)) != 0) {			prom_getstring(scan, "device_type", node_str, sizeof(node_str));			if(strcmp(node_str, "cpu") == 0) {				cpu_nds[cpu_ctr] = scan;				linux_cpus[cpu_ctr].prom_node = scan;				thismid = 0;				if (tlb_type == spitfire) {					prom_getproperty(scan, "upa-portid",							 (char *) &thismid, sizeof(thismid));				} else if (tlb_type == cheetah) {					prom_getproperty(scan, "portid",							 (char *) &thismid, sizeof(thismid));				}				linux_cpus[cpu_ctr].mid = thismid;				printk("Found CPU %d (node=%08x,mid=%d)\n",				       cpu_ctr, (unsigned) scan, thismid);				cpu_ctr++;			}		};		if(cpu_ctr == 0) {			prom_printf("No CPU nodes found, cannot continue.\n");			prom_halt();		}		printk("Found %d CPU prom device tree node(s).\n", cpu_ctr);	}	prom_node_cpu = cpu_nds[0];	linux_num_cpus = cpu_ctr;		prom_cpu_nodes[0] = prom_node_cpu;#ifndef CONFIG_SMP	{		extern unsigned long up_clock_tick;		up_clock_tick = prom_getintdefault(prom_node_cpu,						   "clock-frequency",						   0);	}#endif	central_probe();	cpu_probe();}