[deliverable/linux.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();
	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) {
#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.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.
 *
 * 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;

	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]);
			cpu_set(cpu, cpu_possible_map);
			cpu++;
		}
	}

#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();
b8e383d5 KG	103	if (ppc_md.restart)
b8e383d5 KG	104	ppc_md.restart(cmd);
03501dab PM	105	#ifdef CONFIG_SMP
	106	smp_send_stop();
	107	#endif
	108	printk(KERN_EMERG "System Halted, OK to turn off power\n");
	109	local_irq_disable();
	110	while (1) ;
	111	}
	112
	113	void machine_power_off(void)
	114	{
	115	machine_shutdown();
b8e383d5 KG	116	if (ppc_md.power_off)
b8e383d5 KG	117	ppc_md.power_off();
03501dab PM	118	#ifdef CONFIG_SMP
	119	smp_send_stop();
	120	#endif
	121	printk(KERN_EMERG "System Halted, OK to turn off power\n");
	122	local_irq_disable();
	123	while (1) ;
	124	}
	125	/* Used by the G5 thermal driver */
	126	EXPORT_SYMBOL_GPL(machine_power_off);
	127
	128	void (*pm_power_off)(void) = machine_power_off;
	129	EXPORT_SYMBOL_GPL(pm_power_off);
	130
	131	void machine_halt(void)
	132	{
	133	machine_shutdown();
b8e383d5 KG	134	if (ppc_md.halt)
b8e383d5 KG	135	ppc_md.halt();
03501dab PM	136	#ifdef CONFIG_SMP
	137	smp_send_stop();
	138	#endif
	139	printk(KERN_EMERG "System Halted, OK to turn off power\n");
	140	local_irq_disable();
	141	while (1) ;
	142	}
	143
	144
	145	#ifdef CONFIG_TAU
	146	extern u32 cpu_temp(unsigned long cpu);
	147	extern u32 cpu_temp_both(unsigned long cpu);
	148	#endif /* CONFIG_TAU */
	149
	150	#ifdef CONFIG_SMP
	151	DEFINE_PER_CPU(unsigned int, pvr);
	152	#endif
	153
	154	static int show_cpuinfo(struct seq_file m, void v)
	155	{
	156	unsigned long cpu_id = (unsigned long)v - 1;
	157	unsigned int pvr;
	158	unsigned short maj;
	159	unsigned short min;
	160
	161	if (cpu_id == NR_CPUS) {
	162	#if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
	163	unsigned long bogosum = 0;
	164	int i;
394e3902 AM	165	for_each_online_cpu(i)
394e3902 AM	166	bogosum += loops_per_jiffy;
03501dab PM	167	seq_printf(m, "total bogomips\t: %lu.%02lu\n",
	168	bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
	169	#endif /* CONFIG_SMP && CONFIG_PPC32 */
	170	seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
	171
	172	if (ppc_md.show_cpuinfo != NULL)
	173	ppc_md.show_cpuinfo(m);
	174
	175	return 0;
	176	}
	177
	178	/* We only show online cpus: disable preempt (overzealous, I
	179	* knew) to prevent cpu going down. */
	180	preempt_disable();
	181	if (!cpu_online(cpu_id)) {
	182	preempt_enable();
	183	return 0;
	184	}
	185
	186	#ifdef CONFIG_SMP
03501dab	187	pvr = per_cpu(pvr, cpu_id);
03501dab PM	188	#else
	189	pvr = mfspr(SPRN_PVR);
	190	#endif
	191	maj = (pvr >> 8) & 0xFF;
	192	min = pvr & 0xFF;
	193
	194	seq_printf(m, "processor\t: %lu\n", cpu_id);
	195	seq_printf(m, "cpu\t\t: ");
	196
	197	if (cur_cpu_spec->pvr_mask)
	198	seq_printf(m, "%s", cur_cpu_spec->cpu_name);
	199	else
	200	seq_printf(m, "unknown (%08x)", pvr);
	201
	202	#ifdef CONFIG_ALTIVEC
	203	if (cpu_has_feature(CPU_FTR_ALTIVEC))
	204	seq_printf(m, ", altivec supported");
	205	#endif /* CONFIG_ALTIVEC */
	206
	207	seq_printf(m, "\n");
	208
	209	#ifdef CONFIG_TAU
	210	if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
	211	#ifdef CONFIG_TAU_AVERAGE
	212	/* more straightforward, but potentially misleading */
	213	seq_printf(m, "temperature \t: %u C (uncalibrated)\n",
bccfd588	214	cpu_temp(cpu_id));
03501dab PM	215	#else
	216	/* show the actual temp sensor range */
	217	u32 temp;
bccfd588	218	temp = cpu_temp_both(cpu_id);
03501dab PM	219	seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
	220	temp & 0xff, temp >> 16);
	221	#endif
	222	}
	223	#endif /* CONFIG_TAU */
	224
	225	/*
	226	* Assume here that all clock rates are the same in a
	227	* smp system. -- Cort
	228	*/
	229	if (ppc_proc_freq)
	230	seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
	231	ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
	232
	233	if (ppc_md.show_percpuinfo != NULL)
	234	ppc_md.show_percpuinfo(m, cpu_id);
	235
	236	/* If we are a Freescale core do a simple check so
	237	* we dont have to keep adding cases in the future */
	238	if (PVR_VER(pvr) & 0x8000) {
	239	maj = PVR_MAJ(pvr);
	240	min = PVR_MIN(pvr);
	241	} else {
	242	switch (PVR_VER(pvr)) {
	243	case 0x0020: /* 403 family */
	244	maj = PVR_MAJ(pvr) + 1;
	245	min = PVR_MIN(pvr);
	246	break;
	247	case 0x1008: /* 740P/750P ?? */
	248	maj = ((pvr >> 8) & 0xFF) - 1;
	249	min = pvr & 0xFF;
	250	break;
	251	default:
	252	maj = (pvr >> 8) & 0xFF;
	253	min = pvr & 0xFF;
	254	break;
	255	}
	256	}
	257
	258	seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
	259	maj, min, PVR_VER(pvr), PVR_REV(pvr));
	260
	261	#ifdef CONFIG_PPC32
	262	seq_printf(m, "bogomips\t: %lu.%02lu\n",
	263	loops_per_jiffy / (500000/HZ),
	264	(loops_per_jiffy / (5000/HZ)) % 100);
	265	#endif
	266
	267	#ifdef CONFIG_SMP
	268	seq_printf(m, "\n");
	269	#endif
	270
	271	preempt_enable();
	272	return 0;
	273	}
	274
	275	static void c_start(struct seq_file m, loff_t *pos)
	276	{
	277	unsigned long i = *pos;
	278
	279	return i <= NR_CPUS ? (void *)(i + 1) : NULL;
	280	}
	281
	282	static void c_next(struct seq_file m, void v, loff_t pos)
283	{
284	++*pos;
285	return c_start(m, pos);
286	}
287
288	static void c_stop(struct seq_file m, void v)
289	{
290	}
291
292	struct seq_operations cpuinfo_op = {
293	.start =c_start,
294	.next = c_next,
295	.stop = c_stop,
296	.show = show_cpuinfo,
297	};
298
a82765b6 DW	299	void __init check_for_initrd(void)
	300	{
	301	#ifdef CONFIG_BLK_DEV_INITRD
	302	unsigned long *prop;
	303
	304	DBG(" -> check_for_initrd()\n");
	305
	306	if (of_chosen) {
	307	prop = (unsigned long *)get_property(of_chosen,
	308	"linux,initrd-start", NULL);
	309	if (prop != NULL) {
	310	initrd_start = (unsigned long)__va(*prop);
	311	prop = (unsigned long *)get_property(of_chosen,
	312	"linux,initrd-end", NULL);
	313	if (prop != NULL) {
	314	initrd_end = (unsigned long)__va(*prop);
	315	initrd_below_start_ok = 1;
	316	} else
	317	initrd_start = 0;
	318	}
	319	}
	320
	321	/* If we were passed an initrd, set the ROOT_DEV properly if the values
	322	* look sensible. If not, clear initrd reference.
	323	*/
51fae6de	324	if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
a82765b6 DW	325	initrd_end > initrd_start)
a82765b6 DW	326	ROOT_DEV = Root_RAM0;
6761c4a0	327	else
a82765b6	328	initrd_start = initrd_end = 0;
a82765b6 DW	329
	330	if (initrd_start)
	331	printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
	332
	333	DBG(" <- check_for_initrd()\n");
	334	#endif /* CONFIG_BLK_DEV_INITRD */
	335	}
	336
5ad57078 PM	337	#ifdef CONFIG_SMP
	338
	339	/**
	340	* setup_cpu_maps - initialize the following cpu maps:
	341	* cpu_possible_map
	342	* cpu_present_map
	343	* cpu_sibling_map
	344	*
	345	* Having the possible map set up early allows us to restrict allocations
	346	* of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
	347	*
	348	* We do not initialize the online map here; cpus set their own bits in
	349	* cpu_online_map as they come up.
	350	*
	351	* This function is valid only for Open Firmware systems. finish_device_tree
	352	* must be called before using this.
	353	*
	354	* While we're here, we may as well set the "physical" cpu ids in the paca.
4df20460 AB	355	*
4df20460 AB	356	* NOTE: This must match the parsing done in early_init_dt_scan_cpus.
5ad57078 PM	357	*/
	358	void __init smp_setup_cpu_maps(void)
	359	{
	360	struct device_node *dn = NULL;
	361	int cpu = 0;
5ad57078 PM	362
	363	while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
	364	int *intserv;
	365	int j, len = sizeof(u32), nthreads = 1;
	366
	367	intserv = (int *)get_property(dn, "ibm,ppc-interrupt-server#s",
	368	&len);
	369	if (intserv)
	370	nthreads = len / sizeof(int);
	371	else {
	372	intserv = (int *) get_property(dn, "reg", NULL);
	373	if (!intserv)
	374	intserv = &cpu; /* assume logical == phys */
	375	}
	376
	377	for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
	378	cpu_set(cpu, cpu_present_map);
	379	set_hard_smp_processor_id(cpu, intserv[j]);
5ad57078 PM	380	cpu_set(cpu, cpu_possible_map);
	381	cpu++;
	382	}
	383	}
	384
5ad57078 PM	385	#ifdef CONFIG_PPC64
	386	/*
	387	* On pSeries LPAR, we need to know how many cpus
	388	* could possibly be added to this partition.
	389	*/
799d6046 PM	390	if (_machine == PLATFORM_PSERIES_LPAR &&
799d6046 PM	391	(dn = of_find_node_by_path("/rtas"))) {
5ad57078 PM	392	int num_addr_cell, num_size_cell, maxcpus;
	393	unsigned int *ireg;
	394
	395	num_addr_cell = prom_n_addr_cells(dn);
	396	num_size_cell = prom_n_size_cells(dn);
	397
	398	ireg = (unsigned int *)
	399	get_property(dn, "ibm,lrdr-capacity", NULL);
	400
	401	if (!ireg)
	402	goto out;
	403
	404	maxcpus = ireg[num_addr_cell + num_size_cell];
	405
	406	/* Double maxcpus for processors which have SMT capability */
	407	if (cpu_has_feature(CPU_FTR_SMT))
	408	maxcpus *= 2;
	409
	410	if (maxcpus > NR_CPUS) {
	411	printk(KERN_WARNING
	412	"Partition configured for %d cpus, "
	413	"operating system maximum is %d.\n",
	414	maxcpus, NR_CPUS);
	415	maxcpus = NR_CPUS;
	416	} else
	417	printk(KERN_INFO "Partition configured for %d cpus.\n",
	418	maxcpus);
	419
	420	for (cpu = 0; cpu < maxcpus; cpu++)
	421	cpu_set(cpu, cpu_possible_map);
	422	out:
	423	of_node_put(dn);
	424	}
	425
	426	/*
	427	* Do the sibling map; assume only two threads per processor.
	428	*/
	429	for_each_cpu(cpu) {
	430	cpu_set(cpu, cpu_sibling_map[cpu]);
	431	if (cpu_has_feature(CPU_FTR_SMT))
	432	cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
	433	}
	434
a7f290da	435	vdso_data->processorCount = num_present_cpus();
5ad57078 PM	436	#endif /* CONFIG_PPC64 */
	437	}
	438	#endif /* CONFIG_SMP */
fca5dcd4 PM	439
	440	#ifdef CONFIG_XMON
	441	static int __init early_xmon(char *p)
	442	{
	443	/* ensure xmon is enabled */
	444	if (p) {
	445	if (strncmp(p, "on", 2) == 0)
	446	xmon_init(1);
	447	if (strncmp(p, "off", 3) == 0)
	448	xmon_init(0);
	449	if (strncmp(p, "early", 5) != 0)
	450	return 0;
	451	}
	452	xmon_init(1);
	453	debugger(NULL);
	454
	455	return 0;
	456	}
	457	early_param("xmon", early_xmon);
	458	#endif