arch/sparc/kernel/smp.c - third_party/linux - Git at Google

 /* 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/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>

 #include "irq.h"

 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);

 	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);
 	extern void smp4d_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);

 	switch(sparc_cpu_model) {
 	case sun4:
 		printk("SUN4\n");
 		BUG();
 		break;
 	case sun4c:
 		printk("SUN4C\n");
 		BUG();
 		break;
 	case sun4m:
 		smp4m_smp_done();
 		break;
 	case sun4d:
 		smp4d_smp_done();
 		break;
 	case sun4e:
 		printk("SUN4E\n");
 		BUG();
 		break;
 	case sun4u:
 		printk("SUN4U\n");
 		BUG();
 		break;
 	default:
 		printk("UNKNOWN!\n");
 		BUG();
 		break;
 	};
 }

 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 __init smp4m_boot_cpus(void);
 	extern void __init smp4d_boot_cpus(void);
 	int i, cpuid, extra;

 	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);

 	switch(sparc_cpu_model) {
 	case sun4:
 		printk("SUN4\n");
 		BUG();
 		break;
 	case sun4c:
 		printk("SUN4C\n");
 		BUG();
 		break;
 	case sun4m:
 		smp4m_boot_cpus();
 		break;
 	case sun4d:
 		smp4d_boot_cpus();
 		break;
 	case sun4e:
 		printk("SUN4E\n");
 		BUG();
 		break;
 	case sun4u:
 		printk("SUN4U\n");
 		BUG();
 		break;
 	default:
 		printk("UNKNOWN!\n");
 		BUG();
 		break;
 	};
 }

 /* 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 __cpuinit smp4m_boot_one_cpu(int);
 	extern int __cpuinit smp4d_boot_one_cpu(int);
 	int ret=0;

 	switch(sparc_cpu_model) {
 	case sun4:
 		printk("SUN4\n");
 		BUG();
 		break;
 	case sun4c:
 		printk("SUN4C\n");
 		BUG();
 		break;
 	case sun4m:
 		ret = smp4m_boot_one_cpu(cpu);
 		break;
 	case sun4d:
 		ret = smp4d_boot_one_cpu(cpu);
 		break;
 	case sun4e:
 		printk("SUN4E\n");
 		BUG();
 		break;
 	case sun4u:
 		printk("SUN4U\n");
 		BUG();
 		break;
 	default:
 		printk("UNKNOWN!\n");
 		BUG();
 		break;
 	};

 	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);
 }
	/* 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/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>

	#include "irq.h"

	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);

	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);
	extern void smp4d_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);

	switch(sparc_cpu_model) {
	case sun4:
	printk("SUN4\n");
	BUG();
	break;
	case sun4c:
	printk("SUN4C\n");
	BUG();
	break;
	case sun4m:
	smp4m_smp_done();
	break;
	case sun4d:
	smp4d_smp_done();
	break;
	case sun4e:
	printk("SUN4E\n");
	BUG();
	break;
	case sun4u:
	printk("SUN4U\n");
	BUG();
	break;
	default:
	printk("UNKNOWN!\n");
	BUG();
	break;
	};
	}

	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 __init smp4m_boot_cpus(void);
	extern void __init smp4d_boot_cpus(void);
	int i, cpuid, extra;

	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);

	switch(sparc_cpu_model) {
	case sun4:
	printk("SUN4\n");
	BUG();
	break;
	case sun4c:
	printk("SUN4C\n");
	BUG();
	break;
	case sun4m:
	smp4m_boot_cpus();
	break;
	case sun4d:
	smp4d_boot_cpus();
	break;
	case sun4e:
	printk("SUN4E\n");
	BUG();
	break;
	case sun4u:
	printk("SUN4U\n");
	BUG();
	break;
	default:
	printk("UNKNOWN!\n");
	BUG();
	break;
	};
	}

	/* 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 __cpuinit smp4m_boot_one_cpu(int);
	extern int __cpuinit smp4d_boot_one_cpu(int);
	int ret=0;

	switch(sparc_cpu_model) {
	case sun4:
	printk("SUN4\n");
	BUG();
	break;
	case sun4c:
	printk("SUN4C\n");
	BUG();
	break;
	case sun4m:
	ret = smp4m_boot_one_cpu(cpu);
	break;
	case sun4d:
	ret = smp4d_boot_one_cpu(cpu);
	break;
	case sun4e:
	printk("SUN4E\n");
	BUG();
	break;
	case sun4u:
	printk("SUN4U\n");
	BUG();
	break;
	default:
	printk("UNKNOWN!\n");
	BUG();
	break;
	};

	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);
	}