[deliverable/linux.git] / arch / sparc / kernel / smp.c

/* smp.c: Sparc SMP support.
 *
 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 * Copyright (C) 2004 Keith M Wesolowski (wesolows@foobazco.org)
 */

#include <asm/head.h>

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/threads.h>
#include <linux/smp.h>
#include <linux/smp_lock.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/cache.h>
#include <linux/delay.h>

#include <asm/ptrace.h>
#include <asm/atomic.h>

#include <asm/irq.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/oplib.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include <asm/cpudata.h>

volatile int smp_processors_ready = 0;
int smp_num_cpus = 1;
volatile unsigned long cpu_callin_map[NR_CPUS] __initdata = {0,};
unsigned char boot_cpu_id = 0;
unsigned char boot_cpu_id4 = 0; /* boot_cpu_id << 2 */
int smp_activated = 0;
volatile int __cpu_number_map[NR_CPUS];
volatile int __cpu_logical_map[NR_CPUS];

cpumask_t cpu_online_map = CPU_MASK_NONE;
cpumask_t phys_cpu_present_map = CPU_MASK_NONE;
cpumask_t smp_commenced_mask = CPU_MASK_NONE;

/* The only guaranteed locking primitive available on all Sparc
 * processors is 'ldstub [%reg + immediate], %dest_reg' which atomically
 * places the current byte at the effective address into dest_reg and
 * places 0xff there afterwards.  Pretty lame locking primitive
 * compared to the Alpha and the Intel no?  Most Sparcs have 'swap'
 * instruction which is much better...
 */

/* Used to make bitops atomic */
unsigned char bitops_spinlock = 0;

void __cpuinit smp_store_cpu_info(int id)
{
	int cpu_node;

	cpu_data(id).udelay_val = loops_per_jiffy;

	cpu_find_by_mid(id, &cpu_node);
	cpu_data(id).clock_tick = prom_getintdefault(cpu_node,
						     "clock-frequency", 0);
	cpu_data(id).prom_node = cpu_node;
	cpu_data(id).mid = cpu_get_hwmid(cpu_node);

	/* this is required to tune the scheduler correctly */
	/* is it possible to have CPUs with different cache sizes? */
	if (id == boot_cpu_id) {
		int cache_line,cache_nlines;
		cache_line = 0x20;
		cache_line = prom_getintdefault(cpu_node, "ecache-line-size", cache_line);
		cache_nlines = 0x8000;
		cache_nlines = prom_getintdefault(cpu_node, "ecache-nlines", cache_nlines);
		max_cache_size = cache_line * cache_nlines;
	}
	if (cpu_data(id).mid < 0)
		panic("No MID found for CPU%d at node 0x%08d", id, cpu_node);
}

void __init smp_cpus_done(unsigned int max_cpus)
{
	extern void smp4m_smp_done(void);
	unsigned long bogosum = 0;
	int cpu, num;

	for (cpu = 0, num = 0; cpu < NR_CPUS; cpu++)
		if (cpu_online(cpu)) {
			num++;
			bogosum += cpu_data(cpu).udelay_val;
		}

	printk("Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
		num, bogosum/(500000/HZ),
		(bogosum/(5000/HZ))%100);

	BUG_ON(sparc_cpu_model != sun4m);
	smp4m_smp_done();
}

void cpu_panic(void)
{
	printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id());
	panic("SMP bolixed\n");
}

struct linux_prom_registers smp_penguin_ctable __initdata = { 0 };

void smp_send_reschedule(int cpu)
{
	/* See sparc64 */
}

void smp_send_stop(void)
{
}

void smp_flush_cache_all(void)
{
	xc0((smpfunc_t) BTFIXUP_CALL(local_flush_cache_all));
	local_flush_cache_all();
}

void smp_flush_tlb_all(void)
{
	xc0((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_all));
	local_flush_tlb_all();
}

void smp_flush_cache_mm(struct mm_struct *mm)
{
	if(mm->context != NO_CONTEXT) {
		cpumask_t cpu_mask = mm->cpu_vm_mask;
		cpu_clear(smp_processor_id(), cpu_mask);
		if (!cpus_empty(cpu_mask))
			xc1((smpfunc_t) BTFIXUP_CALL(local_flush_cache_mm), (unsigned long) mm);
		local_flush_cache_mm(mm);
	}
}

void smp_flush_tlb_mm(struct mm_struct *mm)
{
	if(mm->context != NO_CONTEXT) {
		cpumask_t cpu_mask = mm->cpu_vm_mask;
		cpu_clear(smp_processor_id(), cpu_mask);
		if (!cpus_empty(cpu_mask)) {
			xc1((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_mm), (unsigned long) mm);
			if(atomic_read(&mm->mm_users) == 1 && current->active_mm == mm)
				mm->cpu_vm_mask = cpumask_of_cpu(smp_processor_id());
		}
		local_flush_tlb_mm(mm);
	}
}

void smp_flush_cache_range(struct vm_area_struct *vma, unsigned long start,
			   unsigned long end)
{
	struct mm_struct *mm = vma->vm_mm;

	if (mm->context != NO_CONTEXT) {
		cpumask_t cpu_mask = mm->cpu_vm_mask;
		cpu_clear(smp_processor_id(), cpu_mask);
		if (!cpus_empty(cpu_mask))
			xc3((smpfunc_t) BTFIXUP_CALL(local_flush_cache_range), (unsigned long) vma, start, end);
		local_flush_cache_range(vma, start, end);
	}
}

void smp_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
			 unsigned long end)
{
	struct mm_struct *mm = vma->vm_mm;

	if (mm->context != NO_CONTEXT) {
		cpumask_t cpu_mask = mm->cpu_vm_mask;
		cpu_clear(smp_processor_id(), cpu_mask);
		if (!cpus_empty(cpu_mask))
			xc3((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_range), (unsigned long) vma, start, end);
		local_flush_tlb_range(vma, start, end);
	}
}

void smp_flush_cache_page(struct vm_area_struct *vma, unsigned long page)
{
	struct mm_struct *mm = vma->vm_mm;

	if(mm->context != NO_CONTEXT) {
		cpumask_t cpu_mask = mm->cpu_vm_mask;
		cpu_clear(smp_processor_id(), cpu_mask);
		if (!cpus_empty(cpu_mask))
			xc2((smpfunc_t) BTFIXUP_CALL(local_flush_cache_page), (unsigned long) vma, page);
		local_flush_cache_page(vma, page);
	}
}

void smp_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
{
	struct mm_struct *mm = vma->vm_mm;

	if(mm->context != NO_CONTEXT) {
		cpumask_t cpu_mask = mm->cpu_vm_mask;
		cpu_clear(smp_processor_id(), cpu_mask);
		if (!cpus_empty(cpu_mask))
			xc2((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_page), (unsigned long) vma, page);
		local_flush_tlb_page(vma, page);
	}
}

void smp_reschedule_irq(void)
{
	set_need_resched();
}

void smp_flush_page_to_ram(unsigned long page)
{
	/* Current theory is that those who call this are the one's
	 * who have just dirtied their cache with the pages contents
	 * in kernel space, therefore we only run this on local cpu.
	 *
	 * XXX This experiment failed, research further... -DaveM
	 */
#if 1
	xc1((smpfunc_t) BTFIXUP_CALL(local_flush_page_to_ram), page);
#endif
	local_flush_page_to_ram(page);
}

void smp_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr)
{
	cpumask_t cpu_mask = mm->cpu_vm_mask;
	cpu_clear(smp_processor_id(), cpu_mask);
	if (!cpus_empty(cpu_mask))
		xc2((smpfunc_t) BTFIXUP_CALL(local_flush_sig_insns), (unsigned long) mm, insn_addr);
	local_flush_sig_insns(mm, insn_addr);
}

extern unsigned int lvl14_resolution;

/* /proc/profile writes can call this, don't __init it please. */
static DEFINE_SPINLOCK(prof_setup_lock);

int setup_profiling_timer(unsigned int multiplier)
{
	int i;
	unsigned long flags;

	/* Prevent level14 ticker IRQ flooding. */
	if((!multiplier) || (lvl14_resolution / multiplier) < 500)
		return -EINVAL;

	spin_lock_irqsave(&prof_setup_lock, flags);
	for_each_possible_cpu(i) {
		load_profile_irq(i, lvl14_resolution / multiplier);
		prof_multiplier(i) = multiplier;
	}
	spin_unlock_irqrestore(&prof_setup_lock, flags);

	return 0;
}

void __init smp_prepare_cpus(unsigned int max_cpus)
{
	extern void smp4m_boot_cpus(void);
	int i, cpuid, extra;

	BUG_ON(sparc_cpu_model != sun4m);
	printk("Entering SMP Mode...\n");

	extra = 0;
	for (i = 0; !cpu_find_by_instance(i, NULL, &cpuid); i++) {
		if (cpuid >= NR_CPUS)
			extra++;
	}
	/* i = number of cpus */
	if (extra && max_cpus > i - extra)
		printk("Warning: NR_CPUS is too low to start all cpus\n");

	smp_store_cpu_info(boot_cpu_id);

	smp4m_boot_cpus();
}

/* Set this up early so that things like the scheduler can init
 * properly.  We use the same cpu mask for both the present and
 * possible cpu map.
 */
void __init smp_setup_cpu_possible_map(void)
{
	int instance, mid;

	instance = 0;
	while (!cpu_find_by_instance(instance, NULL, &mid)) {
		if (mid < NR_CPUS) {
			cpu_set(mid, phys_cpu_present_map);
			cpu_set(mid, cpu_present_map);
		}
		instance++;
	}
}

void __init smp_prepare_boot_cpu(void)
{
	int cpuid = hard_smp_processor_id();

	if (cpuid >= NR_CPUS) {
		prom_printf("Serious problem, boot cpu id >= NR_CPUS\n");
		prom_halt();
	}
	if (cpuid != 0)
		printk("boot cpu id != 0, this could work but is untested\n");

	current_thread_info()->cpu = cpuid;
	cpu_set(cpuid, cpu_online_map);
	cpu_set(cpuid, phys_cpu_present_map);
}

int __cpuinit __cpu_up(unsigned int cpu)
{
	extern int smp4m_boot_one_cpu(int);
	int ret;

	ret = smp4m_boot_one_cpu(cpu);

	if (!ret) {
		cpu_set(cpu, smp_commenced_mask);
		while (!cpu_online(cpu))
			mb();
	}
	return ret;
}

void smp_bogo(struct seq_file *m)
{
	int i;
	
	for_each_online_cpu(i) {
		seq_printf(m,
			   "Cpu%dBogo\t: %lu.%02lu\n",
			   i,
			   cpu_data(i).udelay_val/(500000/HZ),
			   (cpu_data(i).udelay_val/(5000/HZ))%100);
	}
}

void smp_info(struct seq_file *m)
{
	int i;

	seq_printf(m, "State:\n");
	for_each_online_cpu(i)
		seq_printf(m, "CPU%d\t\t: online\n", i);
}
Commit	Line	Data
1da177e4 LT	1	/* smp.c: Sparc SMP support.
	2	*
	3	* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
	4	* Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
	5	* Copyright (C) 2004 Keith M Wesolowski (wesolows@foobazco.org)
	6	*/
	7
	8	#include <asm/head.h>
	9
	10	#include <linux/kernel.h>
	11	#include <linux/sched.h>
	12	#include <linux/threads.h>
	13	#include <linux/smp.h>
	14	#include <linux/smp_lock.h>
	15	#include <linux/interrupt.h>
	16	#include <linux/kernel_stat.h>
	17	#include <linux/init.h>
	18	#include <linux/spinlock.h>
	19	#include <linux/mm.h>
	20	#include <linux/fs.h>
	21	#include <linux/seq_file.h>
	22	#include <linux/cache.h>
	23	#include <linux/delay.h>
	24
	25	#include <asm/ptrace.h>
	26	#include <asm/atomic.h>
	27
	28	#include <asm/irq.h>
	29	#include <asm/page.h>
	30	#include <asm/pgalloc.h>
	31	#include <asm/pgtable.h>
	32	#include <asm/oplib.h>
	33	#include <asm/cacheflush.h>
	34	#include <asm/tlbflush.h>
	35	#include <asm/cpudata.h>
	36
	37	volatile int smp_processors_ready = 0;
	38	int smp_num_cpus = 1;
	39	volatile unsigned long cpu_callin_map[NR_CPUS] __initdata = {0,};
	40	unsigned char boot_cpu_id = 0;
	41	unsigned char boot_cpu_id4 = 0; /* boot_cpu_id << 2 */
	42	int smp_activated = 0;
	43	volatile int __cpu_number_map[NR_CPUS];
	44	volatile int __cpu_logical_map[NR_CPUS];
	45
	46	cpumask_t cpu_online_map = CPU_MASK_NONE;
	47	cpumask_t phys_cpu_present_map = CPU_MASK_NONE;
a54123e2	48	cpumask_t smp_commenced_mask = CPU_MASK_NONE;
1da177e4 LT	49
	50	/* The only guaranteed locking primitive available on all Sparc
	51	* processors is 'ldstub [%reg + immediate], %dest_reg' which atomically
	52	* places the current byte at the effective address into dest_reg and
	53	* places 0xff there afterwards. Pretty lame locking primitive
	54	* compared to the Alpha and the Intel no? Most Sparcs have 'swap'
	55	* instruction which is much better...
	56	*/
	57
	58	/* Used to make bitops atomic */
	59	unsigned char bitops_spinlock = 0;
	60
92d452f0	61	void __cpuinit smp_store_cpu_info(int id)
1da177e4 LT	62	{
	63	int cpu_node;
	64
	65	cpu_data(id).udelay_val = loops_per_jiffy;
	66
	67	cpu_find_by_mid(id, &cpu_node);
	68	cpu_data(id).clock_tick = prom_getintdefault(cpu_node,
	69	"clock-frequency", 0);
	70	cpu_data(id).prom_node = cpu_node;
	71	cpu_data(id).mid = cpu_get_hwmid(cpu_node);
650fb838 KH	72
	73	/* this is required to tune the scheduler correctly */
	74	/* is it possible to have CPUs with different cache sizes? */
	75	if (id == boot_cpu_id) {
	76	int cache_line,cache_nlines;
	77	cache_line = 0x20;
	78	cache_line = prom_getintdefault(cpu_node, "ecache-line-size", cache_line);
	79	cache_nlines = 0x8000;
	80	cache_nlines = prom_getintdefault(cpu_node, "ecache-nlines", cache_nlines);
	81	max_cache_size = cache_line * cache_nlines;
	82	}
1da177e4 LT	83	if (cpu_data(id).mid < 0)
	84	panic("No MID found for CPU%d at node 0x%08d", id, cpu_node);
	85	}
	86
	87	void __init smp_cpus_done(unsigned int max_cpus)
	88	{
a54123e2 BB	89	extern void smp4m_smp_done(void);
	90	unsigned long bogosum = 0;
	91	int cpu, num;
	92
	93	for (cpu = 0, num = 0; cpu < NR_CPUS; cpu++)
	94	if (cpu_online(cpu)) {
	95	num++;
	96	bogosum += cpu_data(cpu).udelay_val;
	97	}
	98
	99	printk("Total of %d processors activated (%lu.%02lu BogoMIPS).\n",
	100	num, bogosum/(500000/HZ),
	101	(bogosum/(5000/HZ))%100);
	102
	103	BUG_ON(sparc_cpu_model != sun4m);
	104	smp4m_smp_done();
1da177e4 LT	105	}
	106
	107	void cpu_panic(void)
	108	{
	109	printk("CPU[%d]: Returns from cpu_idle!\n", smp_processor_id());
	110	panic("SMP bolixed\n");
	111	}
	112
	113	struct linux_prom_registers smp_penguin_ctable __initdata = { 0 };
	114
1da177e4 LT	115	void smp_send_reschedule(int cpu)
	116	{
	117	/* See sparc64 */
	118	}
	119
	120	void smp_send_stop(void)
	121	{
	122	}
	123
	124	void smp_flush_cache_all(void)
	125	{
	126	xc0((smpfunc_t) BTFIXUP_CALL(local_flush_cache_all));
	127	local_flush_cache_all();
	128	}
	129
	130	void smp_flush_tlb_all(void)
	131	{
	132	xc0((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_all));
	133	local_flush_tlb_all();
	134	}
	135
	136	void smp_flush_cache_mm(struct mm_struct *mm)
	137	{
	138	if(mm->context != NO_CONTEXT) {
	139	cpumask_t cpu_mask = mm->cpu_vm_mask;
	140	cpu_clear(smp_processor_id(), cpu_mask);
	141	if (!cpus_empty(cpu_mask))
	142	xc1((smpfunc_t) BTFIXUP_CALL(local_flush_cache_mm), (unsigned long) mm);
	143	local_flush_cache_mm(mm);
	144	}
	145	}
	146
	147	void smp_flush_tlb_mm(struct mm_struct *mm)
	148	{
	149	if(mm->context != NO_CONTEXT) {
	150	cpumask_t cpu_mask = mm->cpu_vm_mask;
	151	cpu_clear(smp_processor_id(), cpu_mask);
	152	if (!cpus_empty(cpu_mask)) {
	153	xc1((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_mm), (unsigned long) mm);
	154	if(atomic_read(&mm->mm_users) == 1 && current->active_mm == mm)
	155	mm->cpu_vm_mask = cpumask_of_cpu(smp_processor_id());
	156	}
	157	local_flush_tlb_mm(mm);
	158	}
	159	}
	160
	161	void smp_flush_cache_range(struct vm_area_struct *vma, unsigned long start,
	162	unsigned long end)
	163	{
	164	struct mm_struct *mm = vma->vm_mm;
	165
	166	if (mm->context != NO_CONTEXT) {
	167	cpumask_t cpu_mask = mm->cpu_vm_mask;
	168	cpu_clear(smp_processor_id(), cpu_mask);
	169	if (!cpus_empty(cpu_mask))
	170	xc3((smpfunc_t) BTFIXUP_CALL(local_flush_cache_range), (unsigned long) vma, start, end);
	171	local_flush_cache_range(vma, start, end);
	172	}
	173	}
	174
	175	void smp_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
	176	unsigned long end)
	177	{
	178	struct mm_struct *mm = vma->vm_mm;
179
180	if (mm->context != NO_CONTEXT) {
181	cpumask_t cpu_mask = mm->cpu_vm_mask;
182	cpu_clear(smp_processor_id(), cpu_mask);
183	if (!cpus_empty(cpu_mask))
184	xc3((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_range), (unsigned long) vma, start, end);
185	local_flush_tlb_range(vma, start, end);
186	}
187	}
188
189	void smp_flush_cache_page(struct vm_area_struct *vma, unsigned long page)
190	{
191	struct mm_struct *mm = vma->vm_mm;
192
193	if(mm->context != NO_CONTEXT) {
194	cpumask_t cpu_mask = mm->cpu_vm_mask;
195	cpu_clear(smp_processor_id(), cpu_mask);
196	if (!cpus_empty(cpu_mask))
197	xc2((smpfunc_t) BTFIXUP_CALL(local_flush_cache_page), (unsigned long) vma, page);
198	local_flush_cache_page(vma, page);
199	}
200	}
201
202	void smp_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
203	{
204	struct mm_struct *mm = vma->vm_mm;
205
206	if(mm->context != NO_CONTEXT) {
207	cpumask_t cpu_mask = mm->cpu_vm_mask;
208	cpu_clear(smp_processor_id(), cpu_mask);
209	if (!cpus_empty(cpu_mask))
210	xc2((smpfunc_t) BTFIXUP_CALL(local_flush_tlb_page), (unsigned long) vma, page);
211	local_flush_tlb_page(vma, page);
212	}
213	}
214
215	void smp_reschedule_irq(void)
216	{
217	set_need_resched();
218	}
219
220	void smp_flush_page_to_ram(unsigned long page)
221	{
222	/* Current theory is that those who call this are the one's
223	* who have just dirtied their cache with the pages contents
224	* in kernel space, therefore we only run this on local cpu.
225	*
226	* XXX This experiment failed, research further... -DaveM
227	*/
228	#if 1
229	xc1((smpfunc_t) BTFIXUP_CALL(local_flush_page_to_ram), page);
230	#endif
231	local_flush_page_to_ram(page);
232	}
233
234	void smp_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr)
235	{
236	cpumask_t cpu_mask = mm->cpu_vm_mask;
237	cpu_clear(smp_processor_id(), cpu_mask);
238	if (!cpus_empty(cpu_mask))
239	xc2((smpfunc_t) BTFIXUP_CALL(local_flush_sig_insns), (unsigned long) mm, insn_addr);
240	local_flush_sig_insns(mm, insn_addr);
241	}
242
243	extern unsigned int lvl14_resolution;
244
245	/* /proc/profile writes can call this, don't __init it please. */
246	static DEFINE_SPINLOCK(prof_setup_lock);
247
248	int setup_profiling_timer(unsigned int multiplier)
249	{
250	int i;
251	unsigned long flags;
252
253	/* Prevent level14 ticker IRQ flooding. */
254	if((!multiplier) \|\| (lvl14_resolution / multiplier) < 500)
255	return -EINVAL;
256
257	spin_lock_irqsave(&prof_setup_lock, flags);
fff8efe7	258	for_each_possible_cpu(i) {
394e3902	259	load_profile_irq(i, lvl14_resolution / multiplier);
1da177e4 LT	260	prof_multiplier(i) = multiplier;
	261	}
	262	spin_unlock_irqrestore(&prof_setup_lock, flags);
	263
	264	return 0;
	265	}
	266
a54123e2	267	void __init smp_prepare_cpus(unsigned int max_cpus)
1da177e4	268	{
a54123e2	269	extern void smp4m_boot_cpus(void);
7202fb49	270	int i, cpuid, extra;
a54123e2 BB	271
	272	BUG_ON(sparc_cpu_model != sun4m);
	273	printk("Entering SMP Mode...\n");
	274
a54123e2 BB	275	extra = 0;
a54123e2 BB	276	for (i = 0; !cpu_find_by_instance(i, NULL, &cpuid); i++) {
7202fb49	277	if (cpuid >= NR_CPUS)
a54123e2 BB	278	extra++;
a54123e2 BB	279	}
7202fb49 BB	280	/* i = number of cpus */
7202fb49 BB	281	if (extra && max_cpus > i - extra)
a54123e2 BB	282	printk("Warning: NR_CPUS is too low to start all cpus\n");
	283
	284	smp_store_cpu_info(boot_cpu_id);
	285
	286	smp4m_boot_cpus();
1da177e4 LT	287	}
1da177e4 LT	288
7202fb49 BB	289	/* Set this up early so that things like the scheduler can init
	290	* properly. We use the same cpu mask for both the present and
	291	* possible cpu map.
	292	*/
	293	void __init smp_setup_cpu_possible_map(void)
	294	{
	295	int instance, mid;
	296
	297	instance = 0;
	298	while (!cpu_find_by_instance(instance, NULL, &mid)) {
	299	if (mid < NR_CPUS) {
	300	cpu_set(mid, phys_cpu_present_map);
	301	cpu_set(mid, cpu_present_map);
	302	}
	303	instance++;
	304	}
	305	}
	306
92d452f0	307	void __init smp_prepare_boot_cpu(void)
1da177e4	308	{
a54123e2 BB	309	int cpuid = hard_smp_processor_id();
	310
	311	if (cpuid >= NR_CPUS) {
	312	prom_printf("Serious problem, boot cpu id >= NR_CPUS\n");
	313	prom_halt();
	314	}
	315	if (cpuid != 0)
	316	printk("boot cpu id != 0, this could work but is untested\n");
	317
	318	current_thread_info()->cpu = cpuid;
	319	cpu_set(cpuid, cpu_online_map);
	320	cpu_set(cpuid, phys_cpu_present_map);
1da177e4 LT	321	}
1da177e4 LT	322
92d452f0	323	int __cpuinit __cpu_up(unsigned int cpu)
1da177e4	324	{
a54123e2 BB	325	extern int smp4m_boot_one_cpu(int);
	326	int ret;
	327
	328	ret = smp4m_boot_one_cpu(cpu);
	329
	330	if (!ret) {
	331	cpu_set(cpu, smp_commenced_mask);
	332	while (!cpu_online(cpu))
	333	mb();
	334	}
	335	return ret;
1da177e4 LT	336	}
	337
	338	void smp_bogo(struct seq_file *m)
	339	{
	340	int i;
	341
394e3902 AM	342	for_each_online_cpu(i) {
	343	seq_printf(m,
	344	"Cpu%dBogo\t: %lu.%02lu\n",
	345	i,
	346	cpu_data(i).udelay_val/(500000/HZ),
	347	(cpu_data(i).udelay_val/(5000/HZ))%100);
1da177e4 LT	348	}
	349	}
	350
	351	void smp_info(struct seq_file *m)
	352	{
	353	int i;
	354
	355	seq_printf(m, "State:\n");
394e3902 AM	356	for_each_online_cpu(i)
394e3902 AM	357	seq_printf(m, "CPU%d\t\t: online\n", i);
1da177e4	358	}