[mirror_ubuntu-artful-kernel.git] / arch / powerpc / kernel / setup-common.c

/*
 * 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.
 */
#include <linux/config.h>
#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/ide.h>
#include <linux/seq_file.h>
#include <linux/ioport.h>
#include <linux/console.h>
#include <linux/utsname.h>
#include <linux/tty.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 <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/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/lmb.h>
#include <asm/xmon.h>

#include "setup.h"

#undef DEBUG

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

#ifdef CONFIG_PPC_MULTIPLATFORM
int _machine = 0;
EXPORT_SYMBOL(_machine);
#endif

unsigned long klimit = (unsigned long) _end;

/*
 * 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();
	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();
	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();
	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) {
#if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
		unsigned long bogosum = 0;
		int i;
		for (i = 0; i < NR_CPUS; ++i)
			if (cpu_online(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.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
	unsigned long *prop;

	DBG(" -> check_for_initrd()\n");

	if (of_chosen) {
		prop = (unsigned long *)get_property(of_chosen,
				"linux,initrd-start", NULL);
		if (prop != NULL) {
			initrd_start = (unsigned long)__va(*prop);
			prop = (unsigned long *)get_property(of_chosen,
					"linux,initrd-end", NULL);
			if (prop != NULL) {
				initrd_end = (unsigned long)__va(*prop);
				initrd_below_start_ok = 1;
			} else
				initrd_start = 0;
		}
	}

	/* 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

/**
 * setup_cpu_maps - initialize the following cpu maps:
 *                  cpu_possible_map
 *                  cpu_present_map
 *                  cpu_sibling_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.
 */
void __init smp_setup_cpu_maps(void)
{
	struct device_node *dn = NULL;
	int cpu = 0;
	int swap_cpuid = 0;

	while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
		int *intserv;
		int j, len = sizeof(u32), nthreads = 1;

		intserv = (int *)get_property(dn, "ibm,ppc-interrupt-server#s",
					      &len);
		if (intserv)
			nthreads = len / sizeof(int);
		else {
			intserv = (int *) get_property(dn, "reg", NULL);
			if (!intserv)
				intserv = &cpu;	/* assume logical == phys */
		}

		for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
			cpu_set(cpu, cpu_present_map);
			set_hard_smp_processor_id(cpu, intserv[j]);

			if (intserv[j] == boot_cpuid_phys)
				swap_cpuid = cpu;
			cpu_set(cpu, cpu_possible_map);
			cpu++;
		}
	}

	/* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
	 * boot cpu is logical 0.
	 */
	if (boot_cpuid_phys != get_hard_smp_processor_id(0)) {
		u32 tmp;
		tmp = get_hard_smp_processor_id(0);
		set_hard_smp_processor_id(0, boot_cpuid_phys);
		set_hard_smp_processor_id(swap_cpuid, tmp);
	}

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

		num_addr_cell = prom_n_addr_cells(dn);
		num_size_cell = prom_n_size_cells(dn);

		ireg = (unsigned int *)
			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 *= 2;

		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);
	}

	/*
	 * Do the sibling map; assume only two threads per processor.
	 */
	for_each_cpu(cpu) {
		cpu_set(cpu, cpu_sibling_map[cpu]);
		if (cpu_has_feature(CPU_FTR_SMT))
			cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
	}

	vdso_data->processorCount = num_present_cpus();
#endif /* CONFIG_PPC64 */
}
#endif /* CONFIG_SMP */

#ifdef CONFIG_XMON
static int __init early_xmon(char *p)
{
	/* ensure xmon is enabled */
	if (p) {
		if (strncmp(p, "on", 2) == 0)
			xmon_init(1);
		if (strncmp(p, "off", 3) == 0)
			xmon_init(0);
		if (strncmp(p, "early", 5) != 0)
			return 0;
	}
	xmon_init(1);
	debugger(NULL);

	return 0;
}
early_param("xmon", early_xmon);
#endif
Commit	Line	Data
03501dab PM	1	/*
	2	* Common boot and setup code for both 32-bit and 64-bit.
	3	* Extracted from arch/powerpc/kernel/setup_64.c.
	4	*
	5	* Copyright (C) 2001 PPC64 Team, IBM Corp
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* as published by the Free Software Foundation; either version
	10	* 2 of the License, or (at your option) any later version.
	11	*/
	12	#include <linux/config.h>
	13	#include <linux/module.h>
	14	#include <linux/string.h>
	15	#include <linux/sched.h>
	16	#include <linux/init.h>
	17	#include <linux/kernel.h>
	18	#include <linux/reboot.h>
	19	#include <linux/delay.h>
	20	#include <linux/initrd.h>
	21	#include <linux/ide.h>
	22	#include <linux/seq_file.h>
	23	#include <linux/ioport.h>
	24	#include <linux/console.h>
	25	#include <linux/utsname.h>
	26	#include <linux/tty.h>
	27	#include <linux/root_dev.h>
	28	#include <linux/notifier.h>
	29	#include <linux/cpu.h>
	30	#include <linux/unistd.h>
	31	#include <linux/serial.h>
	32	#include <linux/serial_8250.h>
	33	#include <asm/io.h>
	34	#include <asm/prom.h>
	35	#include <asm/processor.h>
a7f290da	36	#include <asm/vdso_datapage.h>
03501dab	37	#include <asm/pgtable.h>
03501dab PM	38	#include <asm/smp.h>
	39	#include <asm/elf.h>
	40	#include <asm/machdep.h>
	41	#include <asm/time.h>
	42	#include <asm/cputable.h>
	43	#include <asm/sections.h>
	44	#include <asm/btext.h>
	45	#include <asm/nvram.h>
	46	#include <asm/setup.h>
	47	#include <asm/system.h>
	48	#include <asm/rtas.h>
	49	#include <asm/iommu.h>
	50	#include <asm/serial.h>
	51	#include <asm/cache.h>
	52	#include <asm/page.h>
	53	#include <asm/mmu.h>
	54	#include <asm/lmb.h>
fca5dcd4	55	#include <asm/xmon.h>
03501dab	56
66ba135c SR	57	#include "setup.h"
66ba135c SR	58
03501dab PM	59	#undef DEBUG
	60
	61	#ifdef DEBUG
f9e4ec57	62	#include <asm/udbg.h>
03501dab PM	63	#define DBG(fmt...) udbg_printf(fmt)
	64	#else
	65	#define DBG(fmt...)
	66	#endif
	67
799d6046 PM	68	#ifdef CONFIG_PPC_MULTIPLATFORM
	69	int _machine = 0;
	70	EXPORT_SYMBOL(_machine);
	71	#endif
	72
49b09853 PM	73	unsigned long klimit = (unsigned long) _end;
49b09853 PM	74
03501dab PM	75	/*
	76	* This still seems to be needed... -- paulus
	77	*/
	78	struct screen_info screen_info = {
	79	.orig_x = 0,
	80	.orig_y = 25,
	81	.orig_video_cols = 80,
	82	.orig_video_lines = 25,
	83	.orig_video_isVGA = 1,
	84	.orig_video_points = 16
	85	};
	86
	87	#ifdef __DO_IRQ_CANON
	88	/* XXX should go elsewhere eventually */
	89	int ppc_do_canonicalize_irqs;
	90	EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
	91	#endif
	92
	93	/* also used by kexec */
	94	void machine_shutdown(void)
	95	{
3d1229d6 ME	96	if (ppc_md.machine_shutdown)
3d1229d6 ME	97	ppc_md.machine_shutdown();
03501dab PM	98	}
	99
	100	void machine_restart(char *cmd)
	101	{
	102	machine_shutdown();
	103	ppc_md.restart(cmd);
	104	#ifdef CONFIG_SMP
	105	smp_send_stop();
	106	#endif
	107	printk(KERN_EMERG "System Halted, OK to turn off power\n");
	108	local_irq_disable();
	109	while (1) ;
	110	}
	111
	112	void machine_power_off(void)
	113	{
	114	machine_shutdown();
	115	ppc_md.power_off();
	116	#ifdef CONFIG_SMP
	117	smp_send_stop();
	118	#endif
	119	printk(KERN_EMERG "System Halted, OK to turn off power\n");
	120	local_irq_disable();
	121	while (1) ;
	122	}
	123	/* Used by the G5 thermal driver */
	124	EXPORT_SYMBOL_GPL(machine_power_off);
	125
	126	void (*pm_power_off)(void) = machine_power_off;
	127	EXPORT_SYMBOL_GPL(pm_power_off);
	128
	129	void machine_halt(void)
	130	{
	131	machine_shutdown();
	132	ppc_md.halt();
	133	#ifdef CONFIG_SMP
	134	smp_send_stop();
	135	#endif
	136	printk(KERN_EMERG "System Halted, OK to turn off power\n");
	137	local_irq_disable();
	138	while (1) ;
	139	}
	140
	141
	142	#ifdef CONFIG_TAU
	143	extern u32 cpu_temp(unsigned long cpu);
	144	extern u32 cpu_temp_both(unsigned long cpu);
	145	#endif /* CONFIG_TAU */
	146
	147	#ifdef CONFIG_SMP
	148	DEFINE_PER_CPU(unsigned int, pvr);
	149	#endif
	150
	151	static int show_cpuinfo(struct seq_file m, void v)
	152	{
	153	unsigned long cpu_id = (unsigned long)v - 1;
	154	unsigned int pvr;
	155	unsigned short maj;
	156	unsigned short min;
	157
	158	if (cpu_id == NR_CPUS) {
	159	#if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
	160	unsigned long bogosum = 0;
	161	int i;
162	for (i = 0; i < NR_CPUS; ++i)
163	if (cpu_online(i))
164	bogosum += loops_per_jiffy;
165	seq_printf(m, "total bogomips\t: %lu.%02lu\n",
166	bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
167	#endif /* CONFIG_SMP && CONFIG_PPC32 */
168	seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
169
170	if (ppc_md.show_cpuinfo != NULL)
171	ppc_md.show_cpuinfo(m);
172
173	return 0;
174	}
175
176	/* We only show online cpus: disable preempt (overzealous, I
177	* knew) to prevent cpu going down. */
178	preempt_disable();
179	if (!cpu_online(cpu_id)) {
180	preempt_enable();
181	return 0;
182	}
183
184	#ifdef CONFIG_SMP
03501dab	185	pvr = per_cpu(pvr, cpu_id);
03501dab PM	186	#else
	187	pvr = mfspr(SPRN_PVR);
	188	#endif
	189	maj = (pvr >> 8) & 0xFF;
	190	min = pvr & 0xFF;
	191
	192	seq_printf(m, "processor\t: %lu\n", cpu_id);
	193	seq_printf(m, "cpu\t\t: ");
	194
	195	if (cur_cpu_spec->pvr_mask)
	196	seq_printf(m, "%s", cur_cpu_spec->cpu_name);
	197	else
	198	seq_printf(m, "unknown (%08x)", pvr);
	199
	200	#ifdef CONFIG_ALTIVEC
	201	if (cpu_has_feature(CPU_FTR_ALTIVEC))
	202	seq_printf(m, ", altivec supported");
	203	#endif /* CONFIG_ALTIVEC */
	204
	205	seq_printf(m, "\n");
	206
	207	#ifdef CONFIG_TAU
	208	if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
	209	#ifdef CONFIG_TAU_AVERAGE
	210	/* more straightforward, but potentially misleading */
	211	seq_printf(m, "temperature \t: %u C (uncalibrated)\n",
bccfd588	212	cpu_temp(cpu_id));
03501dab PM	213	#else
	214	/* show the actual temp sensor range */
	215	u32 temp;
bccfd588	216	temp = cpu_temp_both(cpu_id);
03501dab PM	217	seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
	218	temp & 0xff, temp >> 16);
	219	#endif
	220	}
	221	#endif /* CONFIG_TAU */
	222
	223	/*
	224	* Assume here that all clock rates are the same in a
	225	* smp system. -- Cort
	226	*/
	227	if (ppc_proc_freq)
	228	seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
	229	ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
	230
	231	if (ppc_md.show_percpuinfo != NULL)
	232	ppc_md.show_percpuinfo(m, cpu_id);
	233
	234	/* If we are a Freescale core do a simple check so
	235	* we dont have to keep adding cases in the future */
	236	if (PVR_VER(pvr) & 0x8000) {
	237	maj = PVR_MAJ(pvr);
	238	min = PVR_MIN(pvr);
	239	} else {
	240	switch (PVR_VER(pvr)) {
	241	case 0x0020: /* 403 family */
	242	maj = PVR_MAJ(pvr) + 1;
	243	min = PVR_MIN(pvr);
	244	break;
	245	case 0x1008: /* 740P/750P ?? */
	246	maj = ((pvr >> 8) & 0xFF) - 1;
	247	min = pvr & 0xFF;
	248	break;
	249	default:
	250	maj = (pvr >> 8) & 0xFF;
	251	min = pvr & 0xFF;
	252	break;
	253	}
	254	}
	255
	256	seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
	257	maj, min, PVR_VER(pvr), PVR_REV(pvr));
	258
	259	#ifdef CONFIG_PPC32
	260	seq_printf(m, "bogomips\t: %lu.%02lu\n",
	261	loops_per_jiffy / (500000/HZ),
	262	(loops_per_jiffy / (5000/HZ)) % 100);
	263	#endif
	264
	265	#ifdef CONFIG_SMP
	266	seq_printf(m, "\n");
	267	#endif
	268
	269	preempt_enable();
	270	return 0;
	271	}
	272
	273	static void c_start(struct seq_file m, loff_t *pos)
	274	{
	275	unsigned long i = *pos;
	276
	277	return i <= NR_CPUS ? (void *)(i + 1) : NULL;
	278	}
	279
	280	static void c_next(struct seq_file m, void v, loff_t pos)
281	{
282	++*pos;
283	return c_start(m, pos);
284	}
285
286	static void c_stop(struct seq_file m, void v)
287	{
288	}
289
290	struct seq_operations cpuinfo_op = {
291	.start =c_start,
292	.next = c_next,
293	.stop = c_stop,
294	.show = show_cpuinfo,
295	};
296
a82765b6 DW	297	void __init check_for_initrd(void)
	298	{
	299	#ifdef CONFIG_BLK_DEV_INITRD
	300	unsigned long *prop;
	301
	302	DBG(" -> check_for_initrd()\n");
	303
	304	if (of_chosen) {
	305	prop = (unsigned long *)get_property(of_chosen,
	306	"linux,initrd-start", NULL);
	307	if (prop != NULL) {
	308	initrd_start = (unsigned long)__va(*prop);
	309	prop = (unsigned long *)get_property(of_chosen,
	310	"linux,initrd-end", NULL);
	311	if (prop != NULL) {
	312	initrd_end = (unsigned long)__va(*prop);
	313	initrd_below_start_ok = 1;
	314	} else
	315	initrd_start = 0;
	316	}
	317	}
	318
	319	/* If we were passed an initrd, set the ROOT_DEV properly if the values
	320	* look sensible. If not, clear initrd reference.
	321	*/
51fae6de	322	if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
a82765b6 DW	323	initrd_end > initrd_start)
a82765b6 DW	324	ROOT_DEV = Root_RAM0;
6761c4a0	325	else
a82765b6	326	initrd_start = initrd_end = 0;
a82765b6 DW	327
	328	if (initrd_start)
	329	printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
	330
	331	DBG(" <- check_for_initrd()\n");
	332	#endif /* CONFIG_BLK_DEV_INITRD */
	333	}
	334
5ad57078 PM	335	#ifdef CONFIG_SMP
	336
	337	/**
	338	* setup_cpu_maps - initialize the following cpu maps:
	339	* cpu_possible_map
	340	* cpu_present_map
	341	* cpu_sibling_map
	342	*
	343	* Having the possible map set up early allows us to restrict allocations
	344	* of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
	345	*
	346	* We do not initialize the online map here; cpus set their own bits in
	347	* cpu_online_map as they come up.
	348	*
	349	* This function is valid only for Open Firmware systems. finish_device_tree
	350	* must be called before using this.
	351	*
	352	* While we're here, we may as well set the "physical" cpu ids in the paca.
	353	*/
	354	void __init smp_setup_cpu_maps(void)
	355	{
	356	struct device_node *dn = NULL;
	357	int cpu = 0;
	358	int swap_cpuid = 0;
	359
	360	while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
	361	int *intserv;
	362	int j, len = sizeof(u32), nthreads = 1;
	363
	364	intserv = (int *)get_property(dn, "ibm,ppc-interrupt-server#s",
	365	&len);
	366	if (intserv)
	367	nthreads = len / sizeof(int);
	368	else {
	369	intserv = (int *) get_property(dn, "reg", NULL);
	370	if (!intserv)
	371	intserv = &cpu; /* assume logical == phys */
	372	}
	373
	374	for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
	375	cpu_set(cpu, cpu_present_map);
	376	set_hard_smp_processor_id(cpu, intserv[j]);
	377
	378	if (intserv[j] == boot_cpuid_phys)
	379	swap_cpuid = cpu;
	380	cpu_set(cpu, cpu_possible_map);
	381	cpu++;
	382	}
	383	}
	384
	385	/* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
	386	* boot cpu is logical 0.
	387	*/
	388	if (boot_cpuid_phys != get_hard_smp_processor_id(0)) {
	389	u32 tmp;
	390	tmp = get_hard_smp_processor_id(0);
	391	set_hard_smp_processor_id(0, boot_cpuid_phys);
	392	set_hard_smp_processor_id(swap_cpuid, tmp);
	393	}
	394
	395	#ifdef CONFIG_PPC64
	396	/*
	397	* On pSeries LPAR, we need to know how many cpus
	398	* could possibly be added to this partition.
399	*/
799d6046 PM	400	if (_machine == PLATFORM_PSERIES_LPAR &&
799d6046 PM	401	(dn = of_find_node_by_path("/rtas"))) {
5ad57078 PM	402	int num_addr_cell, num_size_cell, maxcpus;
	403	unsigned int *ireg;
	404
	405	num_addr_cell = prom_n_addr_cells(dn);
	406	num_size_cell = prom_n_size_cells(dn);
	407
	408	ireg = (unsigned int *)
	409	get_property(dn, "ibm,lrdr-capacity", NULL);
	410
	411	if (!ireg)
	412	goto out;
	413
	414	maxcpus = ireg[num_addr_cell + num_size_cell];
	415
	416	/* Double maxcpus for processors which have SMT capability */
	417	if (cpu_has_feature(CPU_FTR_SMT))
	418	maxcpus *= 2;
	419
	420	if (maxcpus > NR_CPUS) {
	421	printk(KERN_WARNING
	422	"Partition configured for %d cpus, "
	423	"operating system maximum is %d.\n",
	424	maxcpus, NR_CPUS);
	425	maxcpus = NR_CPUS;
	426	} else
	427	printk(KERN_INFO "Partition configured for %d cpus.\n",
	428	maxcpus);
	429
	430	for (cpu = 0; cpu < maxcpus; cpu++)
	431	cpu_set(cpu, cpu_possible_map);
	432	out:
	433	of_node_put(dn);
	434	}
	435
	436	/*
	437	* Do the sibling map; assume only two threads per processor.
	438	*/
	439	for_each_cpu(cpu) {
	440	cpu_set(cpu, cpu_sibling_map[cpu]);
	441	if (cpu_has_feature(CPU_FTR_SMT))
	442	cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
	443	}
	444
a7f290da	445	vdso_data->processorCount = num_present_cpus();
5ad57078 PM	446	#endif /* CONFIG_PPC64 */
	447	}
	448	#endif /* CONFIG_SMP */
fca5dcd4 PM	449
	450	#ifdef CONFIG_XMON
	451	static int __init early_xmon(char *p)
	452	{
	453	/* ensure xmon is enabled */
	454	if (p) {
	455	if (strncmp(p, "on", 2) == 0)
	456	xmon_init(1);
	457	if (strncmp(p, "off", 3) == 0)
	458	xmon_init(0);
	459	if (strncmp(p, "early", 5) != 0)
	460	return 0;
	461	}
	462	xmon_init(1);
	463	debugger(NULL);
	464
	465	return 0;
	466	}
	467	early_param("xmon", early_xmon);
	468	#endif