arch/powerpc/kernel/setup-common.c - maze/linux - Git at Google

 /*
  * Common boot and setup code for both 32-bit and 64-bit.
  * Extracted from arch/powerpc/kernel/setup_64.c.
  *
  * Copyright (C) 2001 PPC64 Team, IBM Corp
  *
  *      This program is free software; you can redistribute it and/or
  *      modify it under the terms of the GNU General Public License
  *      as published by the Free Software Foundation; either version
  *      2 of the License, or (at your option) any later version.
  */

 #undef DEBUG

 #include <linux/module.h>
 #include <linux/string.h>
 #include <linux/sched.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/reboot.h>
 #include <linux/delay.h>
 #include <linux/initrd.h>
 #include <linux/platform_device.h>
 #include <linux/seq_file.h>
 #include <linux/ioport.h>
 #include <linux/console.h>
 #include <linux/utsname.h>
 #include <linux/screen_info.h>
 #include <linux/root_dev.h>
 #include <linux/notifier.h>
 #include <linux/cpu.h>
 #include <linux/unistd.h>
 #include <linux/serial.h>
 #include <linux/serial_8250.h>
 #include <linux/debugfs.h>
 #include <linux/percpu.h>
 #include <linux/lmb.h>
 #include <asm/io.h>
 #include <asm/prom.h>
 #include <asm/processor.h>
 #include <asm/vdso_datapage.h>
 #include <asm/pgtable.h>
 #include <asm/smp.h>
 #include <asm/elf.h>
 #include <asm/machdep.h>
 #include <asm/time.h>
 #include <asm/cputable.h>
 #include <asm/sections.h>
 #include <asm/firmware.h>
 #include <asm/btext.h>
 #include <asm/nvram.h>
 #include <asm/setup.h>
 #include <asm/system.h>
 #include <asm/rtas.h>
 #include <asm/iommu.h>
 #include <asm/serial.h>
 #include <asm/cache.h>
 #include <asm/page.h>
 #include <asm/mmu.h>
 #include <asm/xmon.h>
 #include <asm/cputhreads.h>

 #include "setup.h"

 #ifdef DEBUG
 #include <asm/udbg.h>
 #define DBG(fmt...) udbg_printf(fmt)
 #else
 #define DBG(fmt...)
 #endif

 /* The main machine-dep calls structure
  */
 struct machdep_calls ppc_md;
 EXPORT_SYMBOL(ppc_md);
 struct machdep_calls *machine_id;
 EXPORT_SYMBOL(machine_id);

 unsigned long klimit = (unsigned long) _end;

 char cmd_line[COMMAND_LINE_SIZE];

 /*
  * This still seems to be needed... -- paulus
  */
 struct screen_info screen_info = {
 	.orig_x = 0,
 	.orig_y = 25,
 	.orig_video_cols = 80,
 	.orig_video_lines = 25,
 	.orig_video_isVGA = 1,
 	.orig_video_points = 16
 };

 #ifdef __DO_IRQ_CANON
 /* XXX should go elsewhere eventually */
 int ppc_do_canonicalize_irqs;
 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
 #endif

 /* also used by kexec */
 void machine_shutdown(void)
 {
 	if (ppc_md.machine_shutdown)
 		ppc_md.machine_shutdown();
 }

 void machine_restart(char *cmd)
 {
 	machine_shutdown();
 	if (ppc_md.restart)
 		ppc_md.restart(cmd);
 #ifdef CONFIG_SMP
 	smp_send_stop();
 #endif
 	printk(KERN_EMERG "System Halted, OK to turn off power\n");
 	local_irq_disable();
 	while (1) ;
 }

 void machine_power_off(void)
 {
 	machine_shutdown();
 	if (ppc_md.power_off)
 		ppc_md.power_off();
 #ifdef CONFIG_SMP
 	smp_send_stop();
 #endif
 	printk(KERN_EMERG "System Halted, OK to turn off power\n");
 	local_irq_disable();
 	while (1) ;
 }
 /* Used by the G5 thermal driver */
 EXPORT_SYMBOL_GPL(machine_power_off);

 void (*pm_power_off)(void) = machine_power_off;
 EXPORT_SYMBOL_GPL(pm_power_off);

 void machine_halt(void)
 {
 	machine_shutdown();
 	if (ppc_md.halt)
 		ppc_md.halt();
 #ifdef CONFIG_SMP
 	smp_send_stop();
 #endif
 	printk(KERN_EMERG "System Halted, OK to turn off power\n");
 	local_irq_disable();
 	while (1) ;
 }


 #ifdef CONFIG_TAU
 extern u32 cpu_temp(unsigned long cpu);
 extern u32 cpu_temp_both(unsigned long cpu);
 #endif /* CONFIG_TAU */

 #ifdef CONFIG_SMP
 DEFINE_PER_CPU(unsigned int, pvr);
 #endif

 static int show_cpuinfo(struct seq_file *m, void *v)
 {
 	unsigned long cpu_id = (unsigned long)v - 1;
 	unsigned int pvr;
 	unsigned short maj;
 	unsigned short min;

 	if (cpu_id == NR_CPUS) {
 		struct device_node *root;
 		const char *model = NULL;
 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
 		unsigned long bogosum = 0;
 		int i;
 		for_each_online_cpu(i)
 			bogosum += loops_per_jiffy;
 		seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 			   bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
 #endif /* CONFIG_SMP && CONFIG_PPC32 */
 		seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 		if (ppc_md.name)
 			seq_printf(m, "platform\t: %s\n", ppc_md.name);
 		root = of_find_node_by_path("/");
 		if (root)
 			model = of_get_property(root, "model", NULL);
 		if (model)
 			seq_printf(m, "model\t\t: %s\n", model);
 		of_node_put(root);

 		if (ppc_md.show_cpuinfo != NULL)
 			ppc_md.show_cpuinfo(m);

 		return 0;
 	}

 	/* We only show online cpus: disable preempt (overzealous, I
 	 * knew) to prevent cpu going down. */
 	preempt_disable();
 	if (!cpu_online(cpu_id)) {
 		preempt_enable();
 		return 0;
 	}

 #ifdef CONFIG_SMP
 	pvr = per_cpu(pvr, cpu_id);
 #else
 	pvr = mfspr(SPRN_PVR);
 #endif
 	maj = (pvr >> 8) & 0xFF;
 	min = pvr & 0xFF;

 	seq_printf(m, "processor\t: %lu\n", cpu_id);
 	seq_printf(m, "cpu\t\t: ");

 	if (cur_cpu_spec->pvr_mask)
 		seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 	else
 		seq_printf(m, "unknown (%08x)", pvr);

 #ifdef CONFIG_ALTIVEC
 	if (cpu_has_feature(CPU_FTR_ALTIVEC))
 		seq_printf(m, ", altivec supported");
 #endif /* CONFIG_ALTIVEC */

 	seq_printf(m, "\n");

 #ifdef CONFIG_TAU
 	if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
 #ifdef CONFIG_TAU_AVERAGE
 		/* more straightforward, but potentially misleading */
 		seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 			   cpu_temp(cpu_id));
 #else
 		/* show the actual temp sensor range */
 		u32 temp;
 		temp = cpu_temp_both(cpu_id);
 		seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 			   temp & 0xff, temp >> 16);
 #endif
 	}
 #endif /* CONFIG_TAU */

 	/*
 	 * Assume here that all clock rates are the same in a
 	 * smp system.  -- Cort
 	 */
 	if (ppc_proc_freq)
 		seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 			   ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);

 	if (ppc_md.show_percpuinfo != NULL)
 		ppc_md.show_percpuinfo(m, cpu_id);

 	/* If we are a Freescale core do a simple check so
 	 * we dont have to keep adding cases in the future */
 	if (PVR_VER(pvr) & 0x8000) {
 		maj = PVR_MAJ(pvr);
 		min = PVR_MIN(pvr);
 	} else {
 		switch (PVR_VER(pvr)) {
 			case 0x0020:	/* 403 family */
 				maj = PVR_MAJ(pvr) + 1;
 				min = PVR_MIN(pvr);
 				break;
 			case 0x1008:	/* 740P/750P ?? */
 				maj = ((pvr >> 8) & 0xFF) - 1;
 				min = pvr & 0xFF;
 				break;
 			default:
 				maj = (pvr >> 8) & 0xFF;
 				min = pvr & 0xFF;
 				break;
 		}
 	}

 	seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 		   maj, min, PVR_VER(pvr), PVR_REV(pvr));

 #ifdef CONFIG_PPC32
 	seq_printf(m, "bogomips\t: %lu.%02lu\n",
 		   loops_per_jiffy / (500000/HZ),
 		   (loops_per_jiffy / (5000/HZ)) % 100);
 #endif

 #ifdef CONFIG_SMP
 	seq_printf(m, "\n");
 #endif

 	preempt_enable();
 	return 0;
 }

 static void *c_start(struct seq_file *m, loff_t *pos)
 {
 	unsigned long i = *pos;

 	return i <= NR_CPUS ? (void *)(i + 1) : NULL;
 }

 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 {
 	++*pos;
 	return c_start(m, pos);
 }

 static void c_stop(struct seq_file *m, void *v)
 {
 }

 struct seq_operations cpuinfo_op = {
 	.start =c_start,
 	.next =	c_next,
 	.stop =	c_stop,
 	.show =	show_cpuinfo,
 };

 void __init check_for_initrd(void)
 {
 #ifdef CONFIG_BLK_DEV_INITRD
 	DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
 	    initrd_start, initrd_end);

 	/* If we were passed an initrd, set the ROOT_DEV properly if the values
 	 * look sensible. If not, clear initrd reference.
 	 */
 	if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 	    initrd_end > initrd_start)
 		ROOT_DEV = Root_RAM0;
 	else
 		initrd_start = initrd_end = 0;

 	if (initrd_start)
 		printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);

 	DBG(" <- check_for_initrd()\n");
 #endif /* CONFIG_BLK_DEV_INITRD */
 }

 #ifdef CONFIG_SMP

 int threads_per_core, threads_shift;
 cpumask_t threads_core_mask;

 static void __init cpu_init_thread_core_maps(int tpc)
 {
 	int i;

 	threads_per_core = tpc;
 	threads_core_mask = CPU_MASK_NONE;

 	/* This implementation only supports power of 2 number of threads
 	 * for simplicity and performance
 	 */
 	threads_shift = ilog2(tpc);
 	BUG_ON(tpc != (1 << threads_shift));

 	for (i = 0; i < tpc; i++)
 		cpu_set(i, threads_core_mask);

 	printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
 	       tpc, tpc > 1 ? "s" : "");
 	printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
 }


 /**
  * setup_cpu_maps - initialize the following cpu maps:
  *                  cpu_possible_map
  *                  cpu_present_map
  *
  * Having the possible map set up early allows us to restrict allocations
  * of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
  *
  * We do not initialize the online map here; cpus set their own bits in
  * cpu_online_map as they come up.
  *
  * This function is valid only for Open Firmware systems.  finish_device_tree
  * must be called before using this.
  *
  * While we're here, we may as well set the "physical" cpu ids in the paca.
  *
  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
  */
 void __init smp_setup_cpu_maps(void)
 {
 	struct device_node *dn = NULL;
 	int cpu = 0;
 	int nthreads = 1;

 	DBG("smp_setup_cpu_maps()\n");

 	while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
 		const int *intserv;
 		int j, len;

 		DBG("  * %s...\n", dn->full_name);

 		intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
 				&len);
 		if (intserv) {
 			nthreads = len / sizeof(int);
 			DBG("    ibm,ppc-interrupt-server#s -> %d threads\n",
 			    nthreads);
 		} else {
 			DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
 			intserv = of_get_property(dn, "reg", NULL);
 			if (!intserv)
 				intserv = &cpu;	/* assume logical == phys */
 		}

 		for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
 			DBG("    thread %d -> cpu %d (hard id %d)\n",
 			    j, cpu, intserv[j]);
 			cpu_set(cpu, cpu_present_map);
 			set_hard_smp_processor_id(cpu, intserv[j]);
 			cpu_set(cpu, cpu_possible_map);
 			cpu++;
 		}
 	}

 	/* If no SMT supported, nthreads is forced to 1 */
 	if (!cpu_has_feature(CPU_FTR_SMT)) {
 		DBG("  SMT disabled ! nthreads forced to 1\n");
 		nthreads = 1;
 	}

 #ifdef CONFIG_PPC64
 	/*
 	 * On pSeries LPAR, we need to know how many cpus
 	 * could possibly be added to this partition.
 	 */
 	if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
 	    (dn = of_find_node_by_path("/rtas"))) {
 		int num_addr_cell, num_size_cell, maxcpus;
 		const unsigned int *ireg;

 		num_addr_cell = of_n_addr_cells(dn);
 		num_size_cell = of_n_size_cells(dn);

 		ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);

 		if (!ireg)
 			goto out;

 		maxcpus = ireg[num_addr_cell + num_size_cell];

 		/* Double maxcpus for processors which have SMT capability */
 		if (cpu_has_feature(CPU_FTR_SMT))
 			maxcpus *= nthreads;

 		if (maxcpus > NR_CPUS) {
 			printk(KERN_WARNING
 			       "Partition configured for %d cpus, "
 			       "operating system maximum is %d.\n",
 			       maxcpus, NR_CPUS);
 			maxcpus = NR_CPUS;
 		} else
 			printk(KERN_INFO "Partition configured for %d cpus.\n",
 			       maxcpus);

 		for (cpu = 0; cpu < maxcpus; cpu++)
 			cpu_set(cpu, cpu_possible_map);
 	out:
 		of_node_put(dn);
 	}
 	vdso_data->processorCount = num_present_cpus();
 #endif /* CONFIG_PPC64 */

         /* Initialize CPU <=> thread mapping/
 	 *
 	 * WARNING: We assume that the number of threads is the same for
 	 * every CPU in the system. If that is not the case, then some code
 	 * here will have to be reworked
 	 */
 	cpu_init_thread_core_maps(nthreads);
 }
 #endif /* CONFIG_SMP */

 #ifdef CONFIG_PCSPKR_PLATFORM
 static __init int add_pcspkr(void)
 {
 	struct device_node *np;
 	struct platform_device *pd;
 	int ret;

 	np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
 	of_node_put(np);
 	if (!np)
 		return -ENODEV;

 	pd = platform_device_alloc("pcspkr", -1);
 	if (!pd)
 		return -ENOMEM;

 	ret = platform_device_add(pd);
 	if (ret)
 		platform_device_put(pd);

 	return ret;
 }
 device_initcall(add_pcspkr);
 #endif	/* CONFIG_PCSPKR_PLATFORM */

 void probe_machine(void)
 {
 	extern struct machdep_calls __machine_desc_start;
 	extern struct machdep_calls __machine_desc_end;

 	/*
 	 * Iterate all ppc_md structures until we find the proper
 	 * one for the current machine type
 	 */
 	DBG("Probing machine type ...\n");

 	for (machine_id = &__machine_desc_start;
 	     machine_id < &__machine_desc_end;
 	     machine_id++) {
 		DBG("  %s ...", machine_id->name);
 		memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
 		if (ppc_md.probe()) {
 			DBG(" match !\n");
 			break;
 		}
 		DBG("\n");
 	}
 	/* What can we do if we didn't find ? */
 	if (machine_id >= &__machine_desc_end) {
 		DBG("No suitable machine found !\n");
 		for (;;);
 	}

 	printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
 }

 /* Match a class of boards, not a specific device configuration. */
 int check_legacy_ioport(unsigned long base_port)
 {
 	struct device_node *parent, *np = NULL;
 	int ret = -ENODEV;

 	switch(base_port) {
 	case I8042_DATA_REG:
 		if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
 			np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
 		if (np) {
 			parent = of_get_parent(np);
 			of_node_put(np);
 			np = parent;
 			break;
 		}
 		np = of_find_node_by_type(NULL, "8042");
 		/* Pegasos has no device_type on its 8042 node, look for the
 		 * name instead */
 		if (!np)
 			np = of_find_node_by_name(NULL, "8042");
 		break;
 	case FDC_BASE: /* FDC1 */
 		np = of_find_node_by_type(NULL, "fdc");
 		break;
 #ifdef CONFIG_PPC_PREP
 	case _PIDXR:
 	case _PNPWRP:
 	case PNPBIOS_BASE:
 		/* implement me */
 #endif
 	default:
 		/* ipmi is supposed to fail here */
 		break;
 	}
 	if (!np)
 		return ret;
 	parent = of_get_parent(np);
 	if (parent) {
 		if (strcmp(parent->type, "isa") == 0)
 			ret = 0;
 		of_node_put(parent);
 	}
 	of_node_put(np);
 	return ret;
 }
 EXPORT_SYMBOL(check_legacy_ioport);

 static int ppc_panic_event(struct notifier_block *this,
                              unsigned long event, void *ptr)
 {
 	ppc_md.panic(ptr);  /* May not return */
 	return NOTIFY_DONE;
 }

 static struct notifier_block ppc_panic_block = {
 	.notifier_call = ppc_panic_event,
 	.priority = INT_MIN /* may not return; must be done last */
 };

 void __init setup_panic(void)
 {
 	atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
 }

 #ifdef CONFIG_CHECK_CACHE_COHERENCY
 /*
  * For platforms that have configurable cache-coherency.  This function
  * checks that the cache coherency setting of the kernel matches the setting
  * left by the firmware, as indicated in the device tree.  Since a mismatch
  * will eventually result in DMA failures, we print * and error and call
  * BUG() in that case.
  */

 #ifdef CONFIG_NOT_COHERENT_CACHE
 #define KERNEL_COHERENCY	0
 #else
 #define KERNEL_COHERENCY	1
 #endif

 static int __init check_cache_coherency(void)
 {
 	struct device_node *np;
 	const void *prop;
 	int devtree_coherency;

 	np = of_find_node_by_path("/");
 	prop = of_get_property(np, "coherency-off", NULL);
 	of_node_put(np);

 	devtree_coherency = prop ? 0 : 1;

 	if (devtree_coherency != KERNEL_COHERENCY) {
 		printk(KERN_ERR
 			"kernel coherency:%s != device tree_coherency:%s\n",
 			KERNEL_COHERENCY ? "on" : "off",
 			devtree_coherency ? "on" : "off");
 		BUG();
 	}

 	return 0;
 }

 late_initcall(check_cache_coherency);
 #endif /* CONFIG_CHECK_CACHE_COHERENCY */

 #ifdef CONFIG_DEBUG_FS
 struct dentry *powerpc_debugfs_root;

 static int powerpc_debugfs_init(void)
 {
 	powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);

 	return powerpc_debugfs_root == NULL;
 }
 arch_initcall(powerpc_debugfs_init);
 #endif
	/*
	* Common boot and setup code for both 32-bit and 64-bit.
	* Extracted from arch/powerpc/kernel/setup_64.c.
	*
	* Copyright (C) 2001 PPC64 Team, IBM Corp
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* as published by the Free Software Foundation; either version
	* 2 of the License, or (at your option) any later version.
	*/

	#undef DEBUG

	#include <linux/module.h>
	#include <linux/string.h>
	#include <linux/sched.h>
	#include <linux/init.h>
	#include <linux/kernel.h>
	#include <linux/reboot.h>
	#include <linux/delay.h>
	#include <linux/initrd.h>
	#include <linux/platform_device.h>
	#include <linux/seq_file.h>
	#include <linux/ioport.h>
	#include <linux/console.h>
	#include <linux/utsname.h>
	#include <linux/screen_info.h>
	#include <linux/root_dev.h>
	#include <linux/notifier.h>
	#include <linux/cpu.h>
	#include <linux/unistd.h>
	#include <linux/serial.h>
	#include <linux/serial_8250.h>
	#include <linux/debugfs.h>
	#include <linux/percpu.h>
	#include <linux/lmb.h>
	#include <asm/io.h>
	#include <asm/prom.h>
	#include <asm/processor.h>
	#include <asm/vdso_datapage.h>
	#include <asm/pgtable.h>
	#include <asm/smp.h>
	#include <asm/elf.h>
	#include <asm/machdep.h>
	#include <asm/time.h>
	#include <asm/cputable.h>
	#include <asm/sections.h>
	#include <asm/firmware.h>
	#include <asm/btext.h>
	#include <asm/nvram.h>
	#include <asm/setup.h>
	#include <asm/system.h>
	#include <asm/rtas.h>
	#include <asm/iommu.h>
	#include <asm/serial.h>
	#include <asm/cache.h>
	#include <asm/page.h>
	#include <asm/mmu.h>
	#include <asm/xmon.h>
	#include <asm/cputhreads.h>

	#include "setup.h"

	#ifdef DEBUG
	#include <asm/udbg.h>
	#define DBG(fmt...) udbg_printf(fmt)
	#else
	#define DBG(fmt...)
	#endif

	/* The main machine-dep calls structure
	*/
	struct machdep_calls ppc_md;
	EXPORT_SYMBOL(ppc_md);
	struct machdep_calls *machine_id;
	EXPORT_SYMBOL(machine_id);

	unsigned long klimit = (unsigned long) _end;

	char cmd_line[COMMAND_LINE_SIZE];

	/*
	* This still seems to be needed... -- paulus
	*/
	struct screen_info screen_info = {
	.orig_x = 0,
	.orig_y = 25,
	.orig_video_cols = 80,
	.orig_video_lines = 25,
	.orig_video_isVGA = 1,
	.orig_video_points = 16
	};

	#ifdef __DO_IRQ_CANON
	/* XXX should go elsewhere eventually */
	int ppc_do_canonicalize_irqs;
	EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
	#endif

	/* also used by kexec */
	void machine_shutdown(void)
	{
	if (ppc_md.machine_shutdown)
	ppc_md.machine_shutdown();
	}

	void machine_restart(char *cmd)
	{
	machine_shutdown();
	if (ppc_md.restart)
	ppc_md.restart(cmd);
	#ifdef CONFIG_SMP
	smp_send_stop();
	#endif
	printk(KERN_EMERG "System Halted, OK to turn off power\n");
	local_irq_disable();
	while (1) ;
	}

	void machine_power_off(void)
	{
	machine_shutdown();
	if (ppc_md.power_off)
	ppc_md.power_off();
	#ifdef CONFIG_SMP
	smp_send_stop();
	#endif
	printk(KERN_EMERG "System Halted, OK to turn off power\n");
	local_irq_disable();
	while (1) ;
	}
	/* Used by the G5 thermal driver */
	EXPORT_SYMBOL_GPL(machine_power_off);

	void (*pm_power_off)(void) = machine_power_off;
	EXPORT_SYMBOL_GPL(pm_power_off);

	void machine_halt(void)
	{
	machine_shutdown();
	if (ppc_md.halt)
	ppc_md.halt();
	#ifdef CONFIG_SMP
	smp_send_stop();
	#endif
	printk(KERN_EMERG "System Halted, OK to turn off power\n");
	local_irq_disable();
	while (1) ;
	}


	#ifdef CONFIG_TAU
	extern u32 cpu_temp(unsigned long cpu);
	extern u32 cpu_temp_both(unsigned long cpu);
	#endif /* CONFIG_TAU */

	#ifdef CONFIG_SMP
	DEFINE_PER_CPU(unsigned int, pvr);
	#endif

	static int show_cpuinfo(struct seq_file m, void v)
	{
	unsigned long cpu_id = (unsigned long)v - 1;
	unsigned int pvr;
	unsigned short maj;
	unsigned short min;

	if (cpu_id == NR_CPUS) {
	struct device_node *root;
	const char *model = NULL;
	#if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
	unsigned long bogosum = 0;
	int i;
	for_each_online_cpu(i)
	bogosum += loops_per_jiffy;
	seq_printf(m, "total bogomips\t: %lu.%02lu\n",
	bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
	#endif /* CONFIG_SMP && CONFIG_PPC32 */
	seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
	if (ppc_md.name)
	seq_printf(m, "platform\t: %s\n", ppc_md.name);
	root = of_find_node_by_path("/");
	if (root)
	model = of_get_property(root, "model", NULL);
	if (model)
	seq_printf(m, "model\t\t: %s\n", model);
	of_node_put(root);

	if (ppc_md.show_cpuinfo != NULL)
	ppc_md.show_cpuinfo(m);

	return 0;
	}

	/* We only show online cpus: disable preempt (overzealous, I
	* knew) to prevent cpu going down. */
	preempt_disable();
	if (!cpu_online(cpu_id)) {
	preempt_enable();
	return 0;
	}

	#ifdef CONFIG_SMP
	pvr = per_cpu(pvr, cpu_id);
	#else
	pvr = mfspr(SPRN_PVR);
	#endif
	maj = (pvr >> 8) & 0xFF;
	min = pvr & 0xFF;

	seq_printf(m, "processor\t: %lu\n", cpu_id);
	seq_printf(m, "cpu\t\t: ");

	if (cur_cpu_spec->pvr_mask)
	seq_printf(m, "%s", cur_cpu_spec->cpu_name);
	else
	seq_printf(m, "unknown (%08x)", pvr);

	#ifdef CONFIG_ALTIVEC
	if (cpu_has_feature(CPU_FTR_ALTIVEC))
	seq_printf(m, ", altivec supported");
	#endif /* CONFIG_ALTIVEC */

	seq_printf(m, "\n");

	#ifdef CONFIG_TAU
	if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
	#ifdef CONFIG_TAU_AVERAGE
	/* more straightforward, but potentially misleading */
	seq_printf(m, "temperature \t: %u C (uncalibrated)\n",
	cpu_temp(cpu_id));
	#else
	/* show the actual temp sensor range */
	u32 temp;
	temp = cpu_temp_both(cpu_id);
	seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
	temp & 0xff, temp >> 16);
	#endif
	}
	#endif /* CONFIG_TAU */

	/*
	* Assume here that all clock rates are the same in a
	* smp system. -- Cort
	*/
	if (ppc_proc_freq)
	seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
	ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);

	if (ppc_md.show_percpuinfo != NULL)
	ppc_md.show_percpuinfo(m, cpu_id);

	/* If we are a Freescale core do a simple check so
	* we dont have to keep adding cases in the future */
	if (PVR_VER(pvr) & 0x8000) {
	maj = PVR_MAJ(pvr);
	min = PVR_MIN(pvr);
	} else {
	switch (PVR_VER(pvr)) {
	case 0x0020: /* 403 family */
	maj = PVR_MAJ(pvr) + 1;
	min = PVR_MIN(pvr);
	break;
	case 0x1008: /* 740P/750P ?? */
	maj = ((pvr >> 8) & 0xFF) - 1;
	min = pvr & 0xFF;
	break;
	default:
	maj = (pvr >> 8) & 0xFF;
	min = pvr & 0xFF;
	break;
	}
	}

	seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
	maj, min, PVR_VER(pvr), PVR_REV(pvr));

	#ifdef CONFIG_PPC32
	seq_printf(m, "bogomips\t: %lu.%02lu\n",
	loops_per_jiffy / (500000/HZ),
	(loops_per_jiffy / (5000/HZ)) % 100);
	#endif

	#ifdef CONFIG_SMP
	seq_printf(m, "\n");
	#endif

	preempt_enable();
	return 0;
	}

	static void c_start(struct seq_file m, loff_t *pos)
	{
	unsigned long i = *pos;

	return i <= NR_CPUS ? (void *)(i + 1) : NULL;
	}

	static void c_next(struct seq_file m, void v, loff_t pos)
	{
	++*pos;
	return c_start(m, pos);
	}

	static void c_stop(struct seq_file m, void v)
	{
	}

	struct seq_operations cpuinfo_op = {
	.start =c_start,
	.next = c_next,
	.stop = c_stop,
	.show = show_cpuinfo,
	};

	void __init check_for_initrd(void)
	{
	#ifdef CONFIG_BLK_DEV_INITRD
	DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n",
	initrd_start, initrd_end);

	/* If we were passed an initrd, set the ROOT_DEV properly if the values
	* look sensible. If not, clear initrd reference.
	*/
	if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
	initrd_end > initrd_start)
	ROOT_DEV = Root_RAM0;
	else
	initrd_start = initrd_end = 0;

	if (initrd_start)
	printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);

	DBG(" <- check_for_initrd()\n");
	#endif /* CONFIG_BLK_DEV_INITRD */
	}

	#ifdef CONFIG_SMP

	int threads_per_core, threads_shift;
	cpumask_t threads_core_mask;

	static void __init cpu_init_thread_core_maps(int tpc)
	{
	int i;

	threads_per_core = tpc;
	threads_core_mask = CPU_MASK_NONE;

	/* This implementation only supports power of 2 number of threads
	* for simplicity and performance
	*/
	threads_shift = ilog2(tpc);
	BUG_ON(tpc != (1 << threads_shift));

	for (i = 0; i < tpc; i++)
	cpu_set(i, threads_core_mask);

	printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
	tpc, tpc > 1 ? "s" : "");
	printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
	}


	/**
	* setup_cpu_maps - initialize the following cpu maps:
	* cpu_possible_map
	* cpu_present_map
	*
	* Having the possible map set up early allows us to restrict allocations
	* of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
	*
	* We do not initialize the online map here; cpus set their own bits in
	* cpu_online_map as they come up.
	*
	* This function is valid only for Open Firmware systems. finish_device_tree
	* must be called before using this.
	*
	* While we're here, we may as well set the "physical" cpu ids in the paca.
	*
	* NOTE: This must match the parsing done in early_init_dt_scan_cpus.
	*/
	void __init smp_setup_cpu_maps(void)
	{
	struct device_node *dn = NULL;
	int cpu = 0;
	int nthreads = 1;

	DBG("smp_setup_cpu_maps()\n");

	while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
	const int *intserv;
	int j, len;

	DBG(" * %s...\n", dn->full_name);

	intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
	&len);
	if (intserv) {
	nthreads = len / sizeof(int);
	DBG(" ibm,ppc-interrupt-server#s -> %d threads\n",
	nthreads);
	} else {
	DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n");
	intserv = of_get_property(dn, "reg", NULL);
	if (!intserv)
	intserv = &cpu; /* assume logical == phys */
	}

	for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
	DBG(" thread %d -> cpu %d (hard id %d)\n",
	j, cpu, intserv[j]);
	cpu_set(cpu, cpu_present_map);
	set_hard_smp_processor_id(cpu, intserv[j]);
	cpu_set(cpu, cpu_possible_map);
	cpu++;
	}
	}

	/* If no SMT supported, nthreads is forced to 1 */
	if (!cpu_has_feature(CPU_FTR_SMT)) {
	DBG(" SMT disabled ! nthreads forced to 1\n");
	nthreads = 1;
	}

	#ifdef CONFIG_PPC64
	/*
	* On pSeries LPAR, we need to know how many cpus
	* could possibly be added to this partition.
	*/
	if (machine_is(pseries) && firmware_has_feature(FW_FEATURE_LPAR) &&
	(dn = of_find_node_by_path("/rtas"))) {
	int num_addr_cell, num_size_cell, maxcpus;
	const unsigned int *ireg;

	num_addr_cell = of_n_addr_cells(dn);
	num_size_cell = of_n_size_cells(dn);

	ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);

	if (!ireg)
	goto out;

	maxcpus = ireg[num_addr_cell + num_size_cell];

	/* Double maxcpus for processors which have SMT capability */
	if (cpu_has_feature(CPU_FTR_SMT))
	maxcpus *= nthreads;

	if (maxcpus > NR_CPUS) {
	printk(KERN_WARNING
	"Partition configured for %d cpus, "
	"operating system maximum is %d.\n",
	maxcpus, NR_CPUS);
	maxcpus = NR_CPUS;
	} else
	printk(KERN_INFO "Partition configured for %d cpus.\n",
	maxcpus);

	for (cpu = 0; cpu < maxcpus; cpu++)
	cpu_set(cpu, cpu_possible_map);
	out:
	of_node_put(dn);
	}
	vdso_data->processorCount = num_present_cpus();
	#endif /* CONFIG_PPC64 */

	/* Initialize CPU <=> thread mapping/
	*
	* WARNING: We assume that the number of threads is the same for
	* every CPU in the system. If that is not the case, then some code
	* here will have to be reworked
	*/
	cpu_init_thread_core_maps(nthreads);
	}
	#endif /* CONFIG_SMP */

	#ifdef CONFIG_PCSPKR_PLATFORM
	static __init int add_pcspkr(void)
	{
	struct device_node *np;
	struct platform_device *pd;
	int ret;

	np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
	of_node_put(np);
	if (!np)
	return -ENODEV;

	pd = platform_device_alloc("pcspkr", -1);
	if (!pd)
	return -ENOMEM;

	ret = platform_device_add(pd);
	if (ret)
	platform_device_put(pd);

	return ret;
	}
	device_initcall(add_pcspkr);
	#endif /* CONFIG_PCSPKR_PLATFORM */

	void probe_machine(void)
	{
	extern struct machdep_calls __machine_desc_start;
	extern struct machdep_calls __machine_desc_end;

	/*
	* Iterate all ppc_md structures until we find the proper
	* one for the current machine type
	*/
	DBG("Probing machine type ...\n");

	for (machine_id = &__machine_desc_start;
	machine_id < &__machine_desc_end;
	machine_id++) {
	DBG(" %s ...", machine_id->name);
	memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
	if (ppc_md.probe()) {
	DBG(" match !\n");
	break;
	}
	DBG("\n");
	}
	/* What can we do if we didn't find ? */
	if (machine_id >= &__machine_desc_end) {
	DBG("No suitable machine found !\n");
	for (;;);
	}

	printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
	}

	/* Match a class of boards, not a specific device configuration. */
	int check_legacy_ioport(unsigned long base_port)
	{
	struct device_node parent, np = NULL;
	int ret = -ENODEV;

	switch(base_port) {
	case I8042_DATA_REG:
	if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
	np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
	if (np) {
	parent = of_get_parent(np);
	of_node_put(np);
	np = parent;
	break;
	}
	np = of_find_node_by_type(NULL, "8042");
	/* Pegasos has no device_type on its 8042 node, look for the
	* name instead */
	if (!np)
	np = of_find_node_by_name(NULL, "8042");
	break;
	case FDC_BASE: /* FDC1 */
	np = of_find_node_by_type(NULL, "fdc");
	break;
	#ifdef CONFIG_PPC_PREP
	case _PIDXR:
	case _PNPWRP:
	case PNPBIOS_BASE:
	/* implement me */
	#endif
	default:
	/* ipmi is supposed to fail here */
	break;
	}
	if (!np)
	return ret;
	parent = of_get_parent(np);
	if (parent) {
	if (strcmp(parent->type, "isa") == 0)
	ret = 0;
	of_node_put(parent);
	}
	of_node_put(np);
	return ret;
	}
	EXPORT_SYMBOL(check_legacy_ioport);

	static int ppc_panic_event(struct notifier_block *this,
	unsigned long event, void *ptr)
	{
	ppc_md.panic(ptr); /* May not return */
	return NOTIFY_DONE;
	}

	static struct notifier_block ppc_panic_block = {
	.notifier_call = ppc_panic_event,
	.priority = INT_MIN /* may not return; must be done last */
	};

	void __init setup_panic(void)
	{
	atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
	}

	#ifdef CONFIG_CHECK_CACHE_COHERENCY
	/*
	* For platforms that have configurable cache-coherency. This function
	* checks that the cache coherency setting of the kernel matches the setting
	* left by the firmware, as indicated in the device tree. Since a mismatch
	* will eventually result in DMA failures, we print * and error and call
	* BUG() in that case.
	*/

	#ifdef CONFIG_NOT_COHERENT_CACHE
	#define KERNEL_COHERENCY 0
	#else
	#define KERNEL_COHERENCY 1
	#endif

	static int __init check_cache_coherency(void)
	{
	struct device_node *np;
	const void *prop;
	int devtree_coherency;

	np = of_find_node_by_path("/");
	prop = of_get_property(np, "coherency-off", NULL);
	of_node_put(np);

	devtree_coherency = prop ? 0 : 1;

	if (devtree_coherency != KERNEL_COHERENCY) {
	printk(KERN_ERR
	"kernel coherency:%s != device tree_coherency:%s\n",
	KERNEL_COHERENCY ? "on" : "off",
	devtree_coherency ? "on" : "off");
	BUG();
	}

	return 0;
	}

	late_initcall(check_cache_coherency);
	#endif /* CONFIG_CHECK_CACHE_COHERENCY */

	#ifdef CONFIG_DEBUG_FS
	struct dentry *powerpc_debugfs_root;

	static int powerpc_debugfs_init(void)
	{
	powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);

	return powerpc_debugfs_root == NULL;
	}
	arch_initcall(powerpc_debugfs_init);
	#endif