arch/blackfin/mach-common/smp.c - kernel/msm-4.19 - Gitiles

 /*
  * IPI management based on arch/arm/kernel/smp.c (Copyright 2002 ARM Limited)
  *
  * Copyright 2007-2009 Analog Devices Inc.
  *                         Philippe Gerum <rpm@xenomai.org>
  *
  * Licensed under the GPL-2.
  */

 #include <linux/module.h>
 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/spinlock.h>
 #include <linux/sched.h>
 #include <linux/interrupt.h>
 #include <linux/cache.h>
 #include <linux/clockchips.h>
 #include <linux/profile.h>
 #include <linux/errno.h>
 #include <linux/mm.h>
 #include <linux/cpu.h>
 #include <linux/smp.h>
 #include <linux/cpumask.h>
 #include <linux/seq_file.h>
 #include <linux/irq.h>
 #include <linux/slab.h>
 #include <linux/atomic.h>
 #include <asm/cacheflush.h>
 #include <asm/irq_handler.h>
 #include <asm/mmu_context.h>
 #include <asm/pgtable.h>
 #include <asm/pgalloc.h>
 #include <asm/processor.h>
 #include <asm/ptrace.h>
 #include <asm/cpu.h>
 #include <asm/time.h>
 #include <linux/err.h>

 /*
  * Anomaly notes:
  * 05000120 - we always define corelock as 32-bit integer in L2
  */
 struct corelock_slot corelock __attribute__ ((__section__(".l2.bss")));

 #ifdef CONFIG_ICACHE_FLUSH_L1
 unsigned long blackfin_iflush_l1_entry[NR_CPUS];
 #endif

 struct blackfin_initial_pda initial_pda_coreb;

 enum ipi_message_type {
 	BFIN_IPI_NONE,
 	BFIN_IPI_TIMER,
 	BFIN_IPI_RESCHEDULE,
 	BFIN_IPI_CALL_FUNC,
 	BFIN_IPI_CALL_FUNC_SINGLE,
 	BFIN_IPI_CPU_STOP,
 };

 struct blackfin_flush_data {
 	unsigned long start;
 	unsigned long end;
 };

 void *secondary_stack;

 static struct blackfin_flush_data smp_flush_data;

 static DEFINE_SPINLOCK(stop_lock);

 /* A magic number - stress test shows this is safe for common cases */
 #define BFIN_IPI_MSGQ_LEN 5

 /* Simple FIFO buffer, overflow leads to panic */
 struct ipi_data {
 	atomic_t count;
 	atomic_t bits;
 };

 static DEFINE_PER_CPU(struct ipi_data, bfin_ipi);

 static void ipi_cpu_stop(unsigned int cpu)
 {
 	spin_lock(&stop_lock);
 	printk(KERN_CRIT "CPU%u: stopping\n", cpu);
 	dump_stack();
 	spin_unlock(&stop_lock);

 	set_cpu_online(cpu, false);

 	local_irq_disable();

 	while (1)
 		SSYNC();
 }

 static void ipi_flush_icache(void *info)
 {
 	struct blackfin_flush_data *fdata = info;

 	/* Invalidate the memory holding the bounds of the flushed region. */
 	blackfin_dcache_invalidate_range((unsigned long)fdata,
 					 (unsigned long)fdata + sizeof(*fdata));

 	/* Make sure all write buffers in the data side of the core
 	 * are flushed before trying to invalidate the icache.  This
 	 * needs to be after the data flush and before the icache
 	 * flush so that the SSYNC does the right thing in preventing
 	 * the instruction prefetcher from hitting things in cached
 	 * memory at the wrong time -- it runs much further ahead than
 	 * the pipeline.
 	 */
 	SSYNC();

 	/* ipi_flaush_icache is invoked by generic flush_icache_range,
 	 * so call blackfin arch icache flush directly here.
 	 */
 	blackfin_icache_flush_range(fdata->start, fdata->end);
 }

 /* Use IRQ_SUPPLE_0 to request reschedule.
  * When returning from interrupt to user space,
  * there is chance to reschedule */
 static irqreturn_t ipi_handler_int0(int irq, void *dev_instance)
 {
 	unsigned int cpu = smp_processor_id();

 	platform_clear_ipi(cpu, IRQ_SUPPLE_0);
 	return IRQ_HANDLED;
 }

 DECLARE_PER_CPU(struct clock_event_device, coretmr_events);
 void ipi_timer(void)
 {
 	int cpu = smp_processor_id();
 	struct clock_event_device *evt = &per_cpu(coretmr_events, cpu);
 	evt->event_handler(evt);
 }

 static irqreturn_t ipi_handler_int1(int irq, void *dev_instance)
 {
 	struct ipi_data *bfin_ipi_data;
 	unsigned int cpu = smp_processor_id();
 	unsigned long pending;
 	unsigned long msg;

 	platform_clear_ipi(cpu, IRQ_SUPPLE_1);

 	smp_rmb();
 	bfin_ipi_data = &__get_cpu_var(bfin_ipi);
 	while ((pending = atomic_xchg(&bfin_ipi_data->bits, 0)) != 0) {
 		msg = 0;
 		do {
 			msg = find_next_bit(&pending, BITS_PER_LONG, msg + 1);
 			switch (msg) {
 			case BFIN_IPI_TIMER:
 				ipi_timer();
 				break;
 			case BFIN_IPI_RESCHEDULE:
 				scheduler_ipi();
 				break;
 			case BFIN_IPI_CALL_FUNC:
 				generic_smp_call_function_interrupt();
 				break;
 			case BFIN_IPI_CALL_FUNC_SINGLE:
 				generic_smp_call_function_single_interrupt();
 				break;
 			case BFIN_IPI_CPU_STOP:
 				ipi_cpu_stop(cpu);
 				break;
 			default:
 				goto out;
 			}
 			atomic_dec(&bfin_ipi_data->count);
 		} while (msg < BITS_PER_LONG);

 	}
 out:
 	return IRQ_HANDLED;
 }

 static void bfin_ipi_init(void)
 {
 	unsigned int cpu;
 	struct ipi_data *bfin_ipi_data;
 	for_each_possible_cpu(cpu) {
 		bfin_ipi_data = &per_cpu(bfin_ipi, cpu);
 		atomic_set(&bfin_ipi_data->bits, 0);
 		atomic_set(&bfin_ipi_data->count, 0);
 	}
 }

 void send_ipi(const struct cpumask *cpumask, enum ipi_message_type msg)
 {
 	unsigned int cpu;
 	struct ipi_data *bfin_ipi_data;
 	unsigned long flags;

 	local_irq_save(flags);
 	for_each_cpu(cpu, cpumask) {
 		bfin_ipi_data = &per_cpu(bfin_ipi, cpu);
 		atomic_set_mask((1 << msg), &bfin_ipi_data->bits);
 		atomic_inc(&bfin_ipi_data->count);
 	}
 	local_irq_restore(flags);
 	smp_wmb();
 	for_each_cpu(cpu, cpumask)
 		platform_send_ipi_cpu(cpu, IRQ_SUPPLE_1);
 }

 void arch_send_call_function_single_ipi(int cpu)
 {
 	send_ipi(cpumask_of(cpu), BFIN_IPI_CALL_FUNC_SINGLE);
 }

 void arch_send_call_function_ipi_mask(const struct cpumask *mask)
 {
 	send_ipi(mask, BFIN_IPI_CALL_FUNC);
 }

 void smp_send_reschedule(int cpu)
 {
 	send_ipi(cpumask_of(cpu), BFIN_IPI_RESCHEDULE);

 	return;
 }

 void smp_send_msg(const struct cpumask *mask, unsigned long type)
 {
 	send_ipi(mask, type);
 }

 void smp_timer_broadcast(const struct cpumask *mask)
 {
 	smp_send_msg(mask, BFIN_IPI_TIMER);
 }

 void smp_send_stop(void)
 {
 	cpumask_t callmap;

 	preempt_disable();
 	cpumask_copy(&callmap, cpu_online_mask);
 	cpumask_clear_cpu(smp_processor_id(), &callmap);
 	if (!cpumask_empty(&callmap))
 		send_ipi(&callmap, BFIN_IPI_CPU_STOP);

 	preempt_enable();

 	return;
 }

 int __cpu_up(unsigned int cpu, struct task_struct *idle)
 {
 	int ret;

 	secondary_stack = task_stack_page(idle) + THREAD_SIZE;

 	ret = platform_boot_secondary(cpu, idle);

 	secondary_stack = NULL;

 	return ret;
 }

 static void setup_secondary(unsigned int cpu)
 {
 	unsigned long ilat;

 	bfin_write_IMASK(0);
 	CSYNC();
 	ilat = bfin_read_ILAT();
 	CSYNC();
 	bfin_write_ILAT(ilat);
 	CSYNC();

 	/* Enable interrupt levels IVG7-15. IARs have been already
 	 * programmed by the boot CPU.  */
 	bfin_irq_flags |= IMASK_IVG15 |
 	    IMASK_IVG14 | IMASK_IVG13 | IMASK_IVG12 | IMASK_IVG11 |
 	    IMASK_IVG10 | IMASK_IVG9 | IMASK_IVG8 | IMASK_IVG7 | IMASK_IVGHW;
 }

 void secondary_start_kernel(void)
 {
 	unsigned int cpu = smp_processor_id();
 	struct mm_struct *mm = &init_mm;

 	if (_bfin_swrst & SWRST_DBL_FAULT_B) {
 		printk(KERN_EMERG "CoreB Recovering from DOUBLE FAULT event\n");
 #ifdef CONFIG_DEBUG_DOUBLEFAULT
 		printk(KERN_EMERG " While handling exception (EXCAUSE = %#x) at %pF\n",
 			initial_pda_coreb.seqstat_doublefault & SEQSTAT_EXCAUSE,
 			initial_pda_coreb.retx_doublefault);
 		printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %pF\n",
 			initial_pda_coreb.dcplb_doublefault_addr);
 		printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %pF\n",
 			initial_pda_coreb.icplb_doublefault_addr);
 #endif
 		printk(KERN_NOTICE " The instruction at %pF caused a double exception\n",
 			initial_pda_coreb.retx);
 	}

 	/*
 	 * We want the D-cache to be enabled early, in case the atomic
 	 * support code emulates cache coherence (see
 	 * __ARCH_SYNC_CORE_DCACHE).
 	 */
 	init_exception_vectors();

 	local_irq_disable();

 	/* Attach the new idle task to the global mm. */
 	atomic_inc(&mm->mm_users);
 	atomic_inc(&mm->mm_count);
 	current->active_mm = mm;

 	preempt_disable();

 	setup_secondary(cpu);

 	platform_secondary_init(cpu);
 	/* setup local core timer */
 	bfin_local_timer_setup();

 	local_irq_enable();

 	bfin_setup_caches(cpu);

 	notify_cpu_starting(cpu);
 	/*
 	 * Calibrate loops per jiffy value.
 	 * IRQs need to be enabled here - D-cache can be invalidated
 	 * in timer irq handler, so core B can read correct jiffies.
 	 */
 	calibrate_delay();

 	/* We are done with local CPU inits, unblock the boot CPU. */
 	set_cpu_online(cpu, true);
 	cpu_startup_entry(CPUHP_ONLINE);
 }

 void __init smp_prepare_boot_cpu(void)
 {
 }

 void __init smp_prepare_cpus(unsigned int max_cpus)
 {
 	platform_prepare_cpus(max_cpus);
 	bfin_ipi_init();
 	platform_request_ipi(IRQ_SUPPLE_0, ipi_handler_int0);
 	platform_request_ipi(IRQ_SUPPLE_1, ipi_handler_int1);
 }

 void __init smp_cpus_done(unsigned int max_cpus)
 {
 	unsigned long bogosum = 0;
 	unsigned int cpu;

 	for_each_online_cpu(cpu)
 		bogosum += loops_per_jiffy;

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

 void smp_icache_flush_range_others(unsigned long start, unsigned long end)
 {
 	smp_flush_data.start = start;
 	smp_flush_data.end = end;

 	preempt_disable();
 	if (smp_call_function(&ipi_flush_icache, &smp_flush_data, 1))
 		printk(KERN_WARNING "SMP: failed to run I-cache flush request on other CPUs\n");
 	preempt_enable();
 }
 EXPORT_SYMBOL_GPL(smp_icache_flush_range_others);

 #ifdef __ARCH_SYNC_CORE_ICACHE
 unsigned long icache_invld_count[NR_CPUS];
 void resync_core_icache(void)
 {
 	unsigned int cpu = get_cpu();
 	blackfin_invalidate_entire_icache();
 	icache_invld_count[cpu]++;
 	put_cpu();
 }
 EXPORT_SYMBOL(resync_core_icache);
 #endif

 #ifdef __ARCH_SYNC_CORE_DCACHE
 unsigned long dcache_invld_count[NR_CPUS];
 unsigned long barrier_mask __attribute__ ((__section__(".l2.bss")));

 void resync_core_dcache(void)
 {
 	unsigned int cpu = get_cpu();
 	blackfin_invalidate_entire_dcache();
 	dcache_invld_count[cpu]++;
 	put_cpu();
 }
 EXPORT_SYMBOL(resync_core_dcache);
 #endif

 #ifdef CONFIG_HOTPLUG_CPU
 int __cpu_disable(void)
 {
 	unsigned int cpu = smp_processor_id();

 	if (cpu == 0)
 		return -EPERM;

 	set_cpu_online(cpu, false);
 	return 0;
 }

 static DECLARE_COMPLETION(cpu_killed);

 int __cpu_die(unsigned int cpu)
 {
 	return wait_for_completion_timeout(&cpu_killed, 5000);
 }

 void cpu_die(void)
 {
 	complete(&cpu_killed);

 	atomic_dec(&init_mm.mm_users);
 	atomic_dec(&init_mm.mm_count);

 	local_irq_disable();
 	platform_cpu_die();
 }
 #endif
	/*
	* IPI management based on arch/arm/kernel/smp.c (Copyright 2002 ARM Limited)
	*
	* Copyright 2007-2009 Analog Devices Inc.
	* Philippe Gerum <rpm@xenomai.org>
	*
	* Licensed under the GPL-2.
	*/

	#include <linux/module.h>
	#include <linux/delay.h>
	#include <linux/init.h>
	#include <linux/spinlock.h>
	#include <linux/sched.h>
	#include <linux/interrupt.h>
	#include <linux/cache.h>
	#include <linux/clockchips.h>
	#include <linux/profile.h>
	#include <linux/errno.h>
	#include <linux/mm.h>
	#include <linux/cpu.h>
	#include <linux/smp.h>
	#include <linux/cpumask.h>
	#include <linux/seq_file.h>
	#include <linux/irq.h>
	#include <linux/slab.h>
	#include <linux/atomic.h>
	#include <asm/cacheflush.h>
	#include <asm/irq_handler.h>
	#include <asm/mmu_context.h>
	#include <asm/pgtable.h>
	#include <asm/pgalloc.h>
	#include <asm/processor.h>
	#include <asm/ptrace.h>
	#include <asm/cpu.h>
	#include <asm/time.h>
	#include <linux/err.h>

	/*
	* Anomaly notes:
	* 05000120 - we always define corelock as 32-bit integer in L2
	*/
	struct corelock_slot corelock __attribute__ ((__section__(".l2.bss")));

	#ifdef CONFIG_ICACHE_FLUSH_L1
	unsigned long blackfin_iflush_l1_entry[NR_CPUS];
	#endif

	struct blackfin_initial_pda initial_pda_coreb;

	enum ipi_message_type {
	BFIN_IPI_NONE,
	BFIN_IPI_TIMER,
	BFIN_IPI_RESCHEDULE,
	BFIN_IPI_CALL_FUNC,
	BFIN_IPI_CALL_FUNC_SINGLE,
	BFIN_IPI_CPU_STOP,
	};

	struct blackfin_flush_data {
	unsigned long start;
	unsigned long end;
	};

	void *secondary_stack;

	static struct blackfin_flush_data smp_flush_data;

	static DEFINE_SPINLOCK(stop_lock);

	/* A magic number - stress test shows this is safe for common cases */
	#define BFIN_IPI_MSGQ_LEN 5

	/* Simple FIFO buffer, overflow leads to panic */
	struct ipi_data {
	atomic_t count;
	atomic_t bits;
	};

	static DEFINE_PER_CPU(struct ipi_data, bfin_ipi);

	static void ipi_cpu_stop(unsigned int cpu)
	{
	spin_lock(&stop_lock);
	printk(KERN_CRIT "CPU%u: stopping\n", cpu);
	dump_stack();
	spin_unlock(&stop_lock);

	set_cpu_online(cpu, false);

	local_irq_disable();

	while (1)
	SSYNC();
	}

	static void ipi_flush_icache(void *info)
	{
	struct blackfin_flush_data *fdata = info;

	/* Invalidate the memory holding the bounds of the flushed region. */
	blackfin_dcache_invalidate_range((unsigned long)fdata,
	(unsigned long)fdata + sizeof(*fdata));

	/* Make sure all write buffers in the data side of the core
	* are flushed before trying to invalidate the icache. This
	* needs to be after the data flush and before the icache
	* flush so that the SSYNC does the right thing in preventing
	* the instruction prefetcher from hitting things in cached
	* memory at the wrong time -- it runs much further ahead than
	* the pipeline.
	*/
	SSYNC();

	/* ipi_flaush_icache is invoked by generic flush_icache_range,
	* so call blackfin arch icache flush directly here.
	*/
	blackfin_icache_flush_range(fdata->start, fdata->end);
	}

	/* Use IRQ_SUPPLE_0 to request reschedule.
	* When returning from interrupt to user space,
	* there is chance to reschedule */
	static irqreturn_t ipi_handler_int0(int irq, void *dev_instance)
	{
	unsigned int cpu = smp_processor_id();

	platform_clear_ipi(cpu, IRQ_SUPPLE_0);
	return IRQ_HANDLED;
	}

	DECLARE_PER_CPU(struct clock_event_device, coretmr_events);
	void ipi_timer(void)
	{
	int cpu = smp_processor_id();
	struct clock_event_device *evt = &per_cpu(coretmr_events, cpu);
	evt->event_handler(evt);
	}

	static irqreturn_t ipi_handler_int1(int irq, void *dev_instance)
	{
	struct ipi_data *bfin_ipi_data;
	unsigned int cpu = smp_processor_id();
	unsigned long pending;
	unsigned long msg;

	platform_clear_ipi(cpu, IRQ_SUPPLE_1);

	smp_rmb();
	bfin_ipi_data = &__get_cpu_var(bfin_ipi);
	while ((pending = atomic_xchg(&bfin_ipi_data->bits, 0)) != 0) {
	msg = 0;
	do {
	msg = find_next_bit(&pending, BITS_PER_LONG, msg + 1);
	switch (msg) {
	case BFIN_IPI_TIMER:
	ipi_timer();
	break;
	case BFIN_IPI_RESCHEDULE:
	scheduler_ipi();
	break;
	case BFIN_IPI_CALL_FUNC:
	generic_smp_call_function_interrupt();
	break;
	case BFIN_IPI_CALL_FUNC_SINGLE:
	generic_smp_call_function_single_interrupt();
	break;
	case BFIN_IPI_CPU_STOP:
	ipi_cpu_stop(cpu);
	break;
	default:
	goto out;
	}
	atomic_dec(&bfin_ipi_data->count);
	} while (msg < BITS_PER_LONG);

	}
	out:
	return IRQ_HANDLED;
	}

	static void bfin_ipi_init(void)
	{
	unsigned int cpu;
	struct ipi_data *bfin_ipi_data;
	for_each_possible_cpu(cpu) {
	bfin_ipi_data = &per_cpu(bfin_ipi, cpu);
	atomic_set(&bfin_ipi_data->bits, 0);
	atomic_set(&bfin_ipi_data->count, 0);
	}
	}

	void send_ipi(const struct cpumask *cpumask, enum ipi_message_type msg)
	{
	unsigned int cpu;
	struct ipi_data *bfin_ipi_data;
	unsigned long flags;

	local_irq_save(flags);
	for_each_cpu(cpu, cpumask) {
	bfin_ipi_data = &per_cpu(bfin_ipi, cpu);
	atomic_set_mask((1 << msg), &bfin_ipi_data->bits);
	atomic_inc(&bfin_ipi_data->count);
	}
	local_irq_restore(flags);
	smp_wmb();
	for_each_cpu(cpu, cpumask)
	platform_send_ipi_cpu(cpu, IRQ_SUPPLE_1);
	}

	void arch_send_call_function_single_ipi(int cpu)
	{
	send_ipi(cpumask_of(cpu), BFIN_IPI_CALL_FUNC_SINGLE);
	}

	void arch_send_call_function_ipi_mask(const struct cpumask *mask)
	{
	send_ipi(mask, BFIN_IPI_CALL_FUNC);
	}

	void smp_send_reschedule(int cpu)
	{
	send_ipi(cpumask_of(cpu), BFIN_IPI_RESCHEDULE);

	return;
	}

	void smp_send_msg(const struct cpumask *mask, unsigned long type)
	{
	send_ipi(mask, type);
	}

	void smp_timer_broadcast(const struct cpumask *mask)
	{
	smp_send_msg(mask, BFIN_IPI_TIMER);
	}

	void smp_send_stop(void)
	{
	cpumask_t callmap;

	preempt_disable();
	cpumask_copy(&callmap, cpu_online_mask);
	cpumask_clear_cpu(smp_processor_id(), &callmap);
	if (!cpumask_empty(&callmap))
	send_ipi(&callmap, BFIN_IPI_CPU_STOP);

	preempt_enable();

	return;
	}

	int __cpu_up(unsigned int cpu, struct task_struct *idle)
	{
	int ret;

	secondary_stack = task_stack_page(idle) + THREAD_SIZE;

	ret = platform_boot_secondary(cpu, idle);

	secondary_stack = NULL;

	return ret;
	}

	static void setup_secondary(unsigned int cpu)
	{
	unsigned long ilat;

	bfin_write_IMASK(0);
	CSYNC();
	ilat = bfin_read_ILAT();
	CSYNC();
	bfin_write_ILAT(ilat);
	CSYNC();

	/* Enable interrupt levels IVG7-15. IARs have been already
	* programmed by the boot CPU. */
	bfin_irq_flags \|= IMASK_IVG15 \|
	IMASK_IVG14 \| IMASK_IVG13 \| IMASK_IVG12 \| IMASK_IVG11 \|
	IMASK_IVG10 \| IMASK_IVG9 \| IMASK_IVG8 \| IMASK_IVG7 \| IMASK_IVGHW;
	}

	void secondary_start_kernel(void)
	{
	unsigned int cpu = smp_processor_id();
	struct mm_struct *mm = &init_mm;

	if (_bfin_swrst & SWRST_DBL_FAULT_B) {
	printk(KERN_EMERG "CoreB Recovering from DOUBLE FAULT event\n");
	#ifdef CONFIG_DEBUG_DOUBLEFAULT
	printk(KERN_EMERG " While handling exception (EXCAUSE = %#x) at %pF\n",
	initial_pda_coreb.seqstat_doublefault & SEQSTAT_EXCAUSE,
	initial_pda_coreb.retx_doublefault);
	printk(KERN_NOTICE " DCPLB_FAULT_ADDR: %pF\n",
	initial_pda_coreb.dcplb_doublefault_addr);
	printk(KERN_NOTICE " ICPLB_FAULT_ADDR: %pF\n",
	initial_pda_coreb.icplb_doublefault_addr);
	#endif
	printk(KERN_NOTICE " The instruction at %pF caused a double exception\n",
	initial_pda_coreb.retx);
	}

	/*
	* We want the D-cache to be enabled early, in case the atomic
	* support code emulates cache coherence (see
	* __ARCH_SYNC_CORE_DCACHE).
	*/
	init_exception_vectors();

	local_irq_disable();

	/* Attach the new idle task to the global mm. */
	atomic_inc(&mm->mm_users);
	atomic_inc(&mm->mm_count);
	current->active_mm = mm;

	preempt_disable();

	setup_secondary(cpu);

	platform_secondary_init(cpu);
	/* setup local core timer */
	bfin_local_timer_setup();

	local_irq_enable();

	bfin_setup_caches(cpu);

	notify_cpu_starting(cpu);
	/*
	* Calibrate loops per jiffy value.
	* IRQs need to be enabled here - D-cache can be invalidated
	* in timer irq handler, so core B can read correct jiffies.
	*/
	calibrate_delay();

	/* We are done with local CPU inits, unblock the boot CPU. */
	set_cpu_online(cpu, true);
	cpu_startup_entry(CPUHP_ONLINE);
	}

	void __init smp_prepare_boot_cpu(void)
	{
	}

	void __init smp_prepare_cpus(unsigned int max_cpus)
	{
	platform_prepare_cpus(max_cpus);
	bfin_ipi_init();
	platform_request_ipi(IRQ_SUPPLE_0, ipi_handler_int0);
	platform_request_ipi(IRQ_SUPPLE_1, ipi_handler_int1);
	}

	void __init smp_cpus_done(unsigned int max_cpus)
	{
	unsigned long bogosum = 0;
	unsigned int cpu;

	for_each_online_cpu(cpu)
	bogosum += loops_per_jiffy;

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

	void smp_icache_flush_range_others(unsigned long start, unsigned long end)
	{
	smp_flush_data.start = start;
	smp_flush_data.end = end;

	preempt_disable();
	if (smp_call_function(&ipi_flush_icache, &smp_flush_data, 1))
	printk(KERN_WARNING "SMP: failed to run I-cache flush request on other CPUs\n");
	preempt_enable();
	}
	EXPORT_SYMBOL_GPL(smp_icache_flush_range_others);

	#ifdef __ARCH_SYNC_CORE_ICACHE
	unsigned long icache_invld_count[NR_CPUS];
	void resync_core_icache(void)
	{
	unsigned int cpu = get_cpu();
	blackfin_invalidate_entire_icache();
	icache_invld_count[cpu]++;
	put_cpu();
	}
	EXPORT_SYMBOL(resync_core_icache);
	#endif

	#ifdef __ARCH_SYNC_CORE_DCACHE
	unsigned long dcache_invld_count[NR_CPUS];
	unsigned long barrier_mask __attribute__ ((__section__(".l2.bss")));

	void resync_core_dcache(void)
	{
	unsigned int cpu = get_cpu();
	blackfin_invalidate_entire_dcache();
	dcache_invld_count[cpu]++;
	put_cpu();
	}
	EXPORT_SYMBOL(resync_core_dcache);
	#endif

	#ifdef CONFIG_HOTPLUG_CPU
	int __cpu_disable(void)
	{
	unsigned int cpu = smp_processor_id();

	if (cpu == 0)
	return -EPERM;

	set_cpu_online(cpu, false);
	return 0;
	}

	static DECLARE_COMPLETION(cpu_killed);

	int __cpu_die(unsigned int cpu)
	{
	return wait_for_completion_timeout(&cpu_killed, 5000);
	}

	void cpu_die(void)
	{
	complete(&cpu_killed);

	atomic_dec(&init_mm.mm_users);
	atomic_dec(&init_mm.mm_count);

	local_irq_disable();
	platform_cpu_die();
	}
	#endif