arch/sparc/kernel/sun4m_smp.c - arm/linux-arm64-legacy - Git at Google

 /* sun4m_smp.c: Sparc SUN4M SMP support.
  *
  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
  */

 #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/swap.h>
 #include <linux/profile.h>
 #include <asm/cacheflush.h>
 #include <asm/tlbflush.h>

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

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

 #define IRQ_RESCHEDULE		13
 #define IRQ_STOP_CPU		14
 #define IRQ_CROSS_CALL		15

 extern ctxd_t *srmmu_ctx_table_phys;

 extern void calibrate_delay(void);

 extern volatile int smp_processors_ready;
 extern int smp_num_cpus;
 extern volatile unsigned long cpu_callin_map[NR_CPUS];
 extern unsigned char boot_cpu_id;
 extern int smp_activated;
 extern volatile int __cpu_number_map[NR_CPUS];
 extern volatile int __cpu_logical_map[NR_CPUS];
 extern volatile unsigned long ipi_count;
 extern volatile int smp_process_available;
 extern volatile int smp_commenced;
 extern int __smp4m_processor_id(void);

 /*#define SMP_DEBUG*/

 #ifdef SMP_DEBUG
 #define SMP_PRINTK(x)	printk x
 #else
 #define SMP_PRINTK(x)
 #endif

 static inline unsigned long swap(volatile unsigned long *ptr, unsigned long val)
 {
 	__asm__ __volatile__("swap [%1], %0\n\t" :
 			     "=&r" (val), "=&r" (ptr) :
 			     "0" (val), "1" (ptr));
 	return val;
 }

 static void smp_setup_percpu_timer(void);
 extern void cpu_probe(void);

 void __init smp4m_callin(void)
 {
 	int cpuid = hard_smp_processor_id();

 	local_flush_cache_all();
 	local_flush_tlb_all();

 	set_irq_udt(boot_cpu_id);

 	/* Get our local ticker going. */
 	smp_setup_percpu_timer();

 	calibrate_delay();
 	smp_store_cpu_info(cpuid);

 	local_flush_cache_all();
 	local_flush_tlb_all();

 	/*
 	 * Unblock the master CPU _only_ when the scheduler state
 	 * of all secondary CPUs will be up-to-date, so after
 	 * the SMP initialization the master will be just allowed
 	 * to call the scheduler code.
 	 */
 	/* Allow master to continue. */
 	swap((unsigned long *)&cpu_callin_map[cpuid], 1);

 	local_flush_cache_all();
 	local_flush_tlb_all();

 	cpu_probe();

 	/* Fix idle thread fields. */
 	__asm__ __volatile__("ld [%0], %%g6\n\t"
 			     : : "r" (&current_set[cpuid])
 			     : "memory" /* paranoid */);

 	/* Attach to the address space of init_task. */
 	atomic_inc(&init_mm.mm_count);
 	current->active_mm = &init_mm;

 	while(!smp_commenced)
 		barrier();

 	local_flush_cache_all();
 	local_flush_tlb_all();

 	local_irq_enable();
 }

 extern void init_IRQ(void);
 extern void cpu_panic(void);

 /*
  *	Cycle through the processors asking the PROM to start each one.
  */

 extern struct linux_prom_registers smp_penguin_ctable;
 extern unsigned long trapbase_cpu1[];
 extern unsigned long trapbase_cpu2[];
 extern unsigned long trapbase_cpu3[];

 void __init smp4m_boot_cpus(void)
 {
 	int cpucount = 0;
 	int i, mid;

 	printk("Entering SMP Mode...\n");

 	local_irq_enable();
 	cpus_clear(cpu_present_map);

 	for (i = 0; !cpu_find_by_instance(i, NULL, &mid); i++)
 		cpu_set(mid, cpu_present_map);

 	for(i=0; i < NR_CPUS; i++) {
 		__cpu_number_map[i] = -1;
 		__cpu_logical_map[i] = -1;
 	}

 	__cpu_number_map[boot_cpu_id] = 0;
 	__cpu_logical_map[0] = boot_cpu_id;
 	current_thread_info()->cpu = boot_cpu_id;

 	smp_store_cpu_info(boot_cpu_id);
 	set_irq_udt(boot_cpu_id);
 	smp_setup_percpu_timer();
 	local_flush_cache_all();
 	if(cpu_find_by_instance(1, NULL, NULL))
 		return;  /* Not an MP box. */
 	for(i = 0; i < NR_CPUS; i++) {
 		if(i == boot_cpu_id)
 			continue;

 		if (cpu_isset(i, cpu_present_map)) {
 			extern unsigned long sun4m_cpu_startup;
 			unsigned long *entry = &sun4m_cpu_startup;
 			struct task_struct *p;
 			int timeout;

 			/* Cook up an idler for this guy. */
 			p = fork_idle(i);
 			cpucount++;
 			current_set[i] = task_thread_info(p);
 			/* See trampoline.S for details... */
 			entry += ((i-1) * 3);

 			/*
 			 * Initialize the contexts table
 			 * Since the call to prom_startcpu() trashes the structure,
 			 * we need to re-initialize it for each cpu
 			 */
 			smp_penguin_ctable.which_io = 0;
 			smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
 			smp_penguin_ctable.reg_size = 0;

 			/* whirrr, whirrr, whirrrrrrrrr... */
 			printk("Starting CPU %d at %p\n", i, entry);
 			local_flush_cache_all();
 			prom_startcpu(cpu_data(i).prom_node,
 				      &smp_penguin_ctable, 0, (char *)entry);

 			/* wheee... it's going... */
 			for(timeout = 0; timeout < 10000; timeout++) {
 				if(cpu_callin_map[i])
 					break;
 				udelay(200);
 			}
 			if(cpu_callin_map[i]) {
 				/* Another "Red Snapper". */
 				__cpu_number_map[i] = i;
 				__cpu_logical_map[i] = i;
 			} else {
 				cpucount--;
 				printk("Processor %d is stuck.\n", i);
 			}
 		}
 		if(!(cpu_callin_map[i])) {
 			cpu_clear(i, cpu_present_map);
 			__cpu_number_map[i] = -1;
 		}
 	}
 	local_flush_cache_all();
 	if(cpucount == 0) {
 		printk("Error: only one Processor found.\n");
 		cpu_present_map = cpumask_of_cpu(smp_processor_id());
 	} else {
 		unsigned long bogosum = 0;
 		for_each_present_cpu(i)
 			bogosum += cpu_data(i).udelay_val;
 		printk("Total of %d Processors activated (%lu.%02lu BogoMIPS).\n",
 		       cpucount + 1,
 		       bogosum/(500000/HZ),
 		       (bogosum/(5000/HZ))%100);
 		smp_activated = 1;
 		smp_num_cpus = cpucount + 1;
 	}

 	/* Free unneeded trap tables */
 	if (!cpu_isset(i, cpu_present_map)) {
 		ClearPageReserved(virt_to_page(trapbase_cpu1));
 		init_page_count(virt_to_page(trapbase_cpu1));
 		free_page((unsigned long)trapbase_cpu1);
 		totalram_pages++;
 		num_physpages++;
 	}
 	if (!cpu_isset(2, cpu_present_map)) {
 		ClearPageReserved(virt_to_page(trapbase_cpu2));
 		init_page_count(virt_to_page(trapbase_cpu2));
 		free_page((unsigned long)trapbase_cpu2);
 		totalram_pages++;
 		num_physpages++;
 	}
 	if (!cpu_isset(3, cpu_present_map)) {
 		ClearPageReserved(virt_to_page(trapbase_cpu3));
 		init_page_count(virt_to_page(trapbase_cpu3));
 		free_page((unsigned long)trapbase_cpu3);
 		totalram_pages++;
 		num_physpages++;
 	}

 	/* Ok, they are spinning and ready to go. */
 	smp_processors_ready = 1;
 }

 /* At each hardware IRQ, we get this called to forward IRQ reception
  * to the next processor.  The caller must disable the IRQ level being
  * serviced globally so that there are no double interrupts received.
  *
  * XXX See sparc64 irq.c.
  */
 void smp4m_irq_rotate(int cpu)
 {
 }

 /* Cross calls, in order to work efficiently and atomically do all
  * the message passing work themselves, only stopcpu and reschedule
  * messages come through here.
  */
 void smp4m_message_pass(int target, int msg, unsigned long data, int wait)
 {
 	static unsigned long smp_cpu_in_msg[NR_CPUS];
 	cpumask_t mask;
 	int me = smp_processor_id();
 	int irq, i;

 	if(msg == MSG_RESCHEDULE) {
 		irq = IRQ_RESCHEDULE;

 		if(smp_cpu_in_msg[me])
 			return;
 	} else if(msg == MSG_STOP_CPU) {
 		irq = IRQ_STOP_CPU;
 	} else {
 		goto barf;
 	}

 	smp_cpu_in_msg[me]++;
 	if(target == MSG_ALL_BUT_SELF || target == MSG_ALL) {
 		mask = cpu_present_map;
 		if(target == MSG_ALL_BUT_SELF)
 			cpu_clear(me, mask);
 		for(i = 0; i < 4; i++) {
 			if (cpu_isset(i, mask))
 				set_cpu_int(i, irq);
 		}
 	} else {
 		set_cpu_int(target, irq);
 	}
 	smp_cpu_in_msg[me]--;

 	return;
 barf:
 	printk("Yeeee, trying to send SMP msg(%d) on cpu %d\n", msg, me);
 	panic("Bogon SMP message pass.");
 }

 static struct smp_funcall {
 	smpfunc_t func;
 	unsigned long arg1;
 	unsigned long arg2;
 	unsigned long arg3;
 	unsigned long arg4;
 	unsigned long arg5;
 	unsigned long processors_in[NR_CPUS];  /* Set when ipi entered. */
 	unsigned long processors_out[NR_CPUS]; /* Set when ipi exited. */
 } ccall_info;

 static DEFINE_SPINLOCK(cross_call_lock);

 /* Cross calls must be serialized, at least currently. */
 void smp4m_cross_call(smpfunc_t func, unsigned long arg1, unsigned long arg2,
 		    unsigned long arg3, unsigned long arg4, unsigned long arg5)
 {
 	if(smp_processors_ready) {
 		register int ncpus = smp_num_cpus;
 		unsigned long flags;

 		spin_lock_irqsave(&cross_call_lock, flags);

 		/* Init function glue. */
 		ccall_info.func = func;
 		ccall_info.arg1 = arg1;
 		ccall_info.arg2 = arg2;
 		ccall_info.arg3 = arg3;
 		ccall_info.arg4 = arg4;
 		ccall_info.arg5 = arg5;

 		/* Init receive/complete mapping, plus fire the IPI's off. */
 		{
 			cpumask_t mask = cpu_present_map;
 			register int i;

 			cpu_clear(smp_processor_id(), mask);
 			for(i = 0; i < ncpus; i++) {
 				if (cpu_isset(i, mask)) {
 					ccall_info.processors_in[i] = 0;
 					ccall_info.processors_out[i] = 0;
 					set_cpu_int(i, IRQ_CROSS_CALL);
 				} else {
 					ccall_info.processors_in[i] = 1;
 					ccall_info.processors_out[i] = 1;
 				}
 			}
 		}

 		{
 			register int i;

 			i = 0;
 			do {
 				while(!ccall_info.processors_in[i])
 					barrier();
 			} while(++i < ncpus);

 			i = 0;
 			do {
 				while(!ccall_info.processors_out[i])
 					barrier();
 			} while(++i < ncpus);
 		}

 		spin_unlock_irqrestore(&cross_call_lock, flags);
 	}
 }

 /* Running cross calls. */
 void smp4m_cross_call_irq(void)
 {
 	int i = smp_processor_id();

 	ccall_info.processors_in[i] = 1;
 	ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
 			ccall_info.arg4, ccall_info.arg5);
 	ccall_info.processors_out[i] = 1;
 }

 void smp4m_percpu_timer_interrupt(struct pt_regs *regs)
 {
 	int cpu = smp_processor_id();

 	clear_profile_irq(cpu);

 	profile_tick(CPU_PROFILING, regs);

 	if(!--prof_counter(cpu)) {
 		int user = user_mode(regs);

 		irq_enter();
 		update_process_times(user);
 		irq_exit();

 		prof_counter(cpu) = prof_multiplier(cpu);
 	}
 }

 extern unsigned int lvl14_resolution;

 static void __init smp_setup_percpu_timer(void)
 {
 	int cpu = smp_processor_id();

 	prof_counter(cpu) = prof_multiplier(cpu) = 1;
 	load_profile_irq(cpu, lvl14_resolution);

 	if(cpu == boot_cpu_id)
 		enable_pil_irq(14);
 }

 void __init smp4m_blackbox_id(unsigned *addr)
 {
 	int rd = *addr & 0x3e000000;
 	int rs1 = rd >> 11;

 	addr[0] = 0x81580000 | rd;		/* rd %tbr, reg */
 	addr[1] = 0x8130200c | rd | rs1;    	/* srl reg, 0xc, reg */
 	addr[2] = 0x80082003 | rd | rs1;	/* and reg, 3, reg */
 }

 void __init smp4m_blackbox_current(unsigned *addr)
 {
 	int rd = *addr & 0x3e000000;
 	int rs1 = rd >> 11;

 	addr[0] = 0x81580000 | rd;		/* rd %tbr, reg */
 	addr[2] = 0x8130200a | rd | rs1;    	/* srl reg, 0xa, reg */
 	addr[4] = 0x8008200c | rd | rs1;	/* and reg, 3, reg */
 }

 void __init sun4m_init_smp(void)
 {
 	BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4m_blackbox_id);
 	BTFIXUPSET_BLACKBOX(load_current, smp4m_blackbox_current);
 	BTFIXUPSET_CALL(smp_cross_call, smp4m_cross_call, BTFIXUPCALL_NORM);
 	BTFIXUPSET_CALL(smp_message_pass, smp4m_message_pass, BTFIXUPCALL_NORM);
 	BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4m_processor_id, BTFIXUPCALL_NORM);
 }
	/* sun4m_smp.c: Sparc SUN4M SMP support.
	*
	* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
	*/

	#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/swap.h>
	#include <linux/profile.h>
	#include <asm/cacheflush.h>
	#include <asm/tlbflush.h>

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

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

	#define IRQ_RESCHEDULE 13
	#define IRQ_STOP_CPU 14
	#define IRQ_CROSS_CALL 15

	extern ctxd_t *srmmu_ctx_table_phys;

	extern void calibrate_delay(void);

	extern volatile int smp_processors_ready;
	extern int smp_num_cpus;
	extern volatile unsigned long cpu_callin_map[NR_CPUS];
	extern unsigned char boot_cpu_id;
	extern int smp_activated;
	extern volatile int __cpu_number_map[NR_CPUS];
	extern volatile int __cpu_logical_map[NR_CPUS];
	extern volatile unsigned long ipi_count;
	extern volatile int smp_process_available;
	extern volatile int smp_commenced;
	extern int __smp4m_processor_id(void);

	/#define SMP_DEBUG/

	#ifdef SMP_DEBUG
	#define SMP_PRINTK(x) printk x
	#else
	#define SMP_PRINTK(x)
	#endif

	static inline unsigned long swap(volatile unsigned long *ptr, unsigned long val)
	{
	__asm__ __volatile__("swap [%1], %0\n\t" :
	"=&r" (val), "=&r" (ptr) :
	"0" (val), "1" (ptr));
	return val;
	}

	static void smp_setup_percpu_timer(void);
	extern void cpu_probe(void);

	void __init smp4m_callin(void)
	{
	int cpuid = hard_smp_processor_id();

	local_flush_cache_all();
	local_flush_tlb_all();

	set_irq_udt(boot_cpu_id);

	/* Get our local ticker going. */
	smp_setup_percpu_timer();

	calibrate_delay();
	smp_store_cpu_info(cpuid);

	local_flush_cache_all();
	local_flush_tlb_all();

	/*
	* Unblock the master CPU _only_ when the scheduler state
	* of all secondary CPUs will be up-to-date, so after
	* the SMP initialization the master will be just allowed
	* to call the scheduler code.
	*/
	/* Allow master to continue. */
	swap((unsigned long *)&cpu_callin_map[cpuid], 1);

	local_flush_cache_all();
	local_flush_tlb_all();

	cpu_probe();

	/* Fix idle thread fields. */
	__asm__ __volatile__("ld [%0], %%g6\n\t"
	: : "r" (&current_set[cpuid])
	: "memory" /* paranoid */);

	/* Attach to the address space of init_task. */
	atomic_inc(&init_mm.mm_count);
	current->active_mm = &init_mm;

	while(!smp_commenced)
	barrier();

	local_flush_cache_all();
	local_flush_tlb_all();

	local_irq_enable();
	}

	extern void init_IRQ(void);
	extern void cpu_panic(void);

	/*
	* Cycle through the processors asking the PROM to start each one.
	*/

	extern struct linux_prom_registers smp_penguin_ctable;
	extern unsigned long trapbase_cpu1[];
	extern unsigned long trapbase_cpu2[];
	extern unsigned long trapbase_cpu3[];

	void __init smp4m_boot_cpus(void)
	{
	int cpucount = 0;
	int i, mid;

	printk("Entering SMP Mode...\n");

	local_irq_enable();
	cpus_clear(cpu_present_map);

	for (i = 0; !cpu_find_by_instance(i, NULL, &mid); i++)
	cpu_set(mid, cpu_present_map);

	for(i=0; i < NR_CPUS; i++) {
	__cpu_number_map[i] = -1;
	__cpu_logical_map[i] = -1;
	}

	__cpu_number_map[boot_cpu_id] = 0;
	__cpu_logical_map[0] = boot_cpu_id;
	current_thread_info()->cpu = boot_cpu_id;

	smp_store_cpu_info(boot_cpu_id);
	set_irq_udt(boot_cpu_id);
	smp_setup_percpu_timer();
	local_flush_cache_all();
	if(cpu_find_by_instance(1, NULL, NULL))
	return; /* Not an MP box. */
	for(i = 0; i < NR_CPUS; i++) {
	if(i == boot_cpu_id)
	continue;

	if (cpu_isset(i, cpu_present_map)) {
	extern unsigned long sun4m_cpu_startup;
	unsigned long *entry = &sun4m_cpu_startup;
	struct task_struct *p;
	int timeout;

	/* Cook up an idler for this guy. */
	p = fork_idle(i);
	cpucount++;
	current_set[i] = task_thread_info(p);
	/* See trampoline.S for details... */
	entry += ((i-1) * 3);

	/*
	* Initialize the contexts table
	* Since the call to prom_startcpu() trashes the structure,
	* we need to re-initialize it for each cpu
	*/
	smp_penguin_ctable.which_io = 0;
	smp_penguin_ctable.phys_addr = (unsigned int) srmmu_ctx_table_phys;
	smp_penguin_ctable.reg_size = 0;

	/* whirrr, whirrr, whirrrrrrrrr... */
	printk("Starting CPU %d at %p\n", i, entry);
	local_flush_cache_all();
	prom_startcpu(cpu_data(i).prom_node,
	&smp_penguin_ctable, 0, (char *)entry);

	/* wheee... it's going... */
	for(timeout = 0; timeout < 10000; timeout++) {
	if(cpu_callin_map[i])
	break;
	udelay(200);
	}
	if(cpu_callin_map[i]) {
	/* Another "Red Snapper". */
	__cpu_number_map[i] = i;
	__cpu_logical_map[i] = i;
	} else {
	cpucount--;
	printk("Processor %d is stuck.\n", i);
	}
	}
	if(!(cpu_callin_map[i])) {
	cpu_clear(i, cpu_present_map);
	__cpu_number_map[i] = -1;
	}
	}
	local_flush_cache_all();
	if(cpucount == 0) {
	printk("Error: only one Processor found.\n");
	cpu_present_map = cpumask_of_cpu(smp_processor_id());
	} else {
	unsigned long bogosum = 0;
	for_each_present_cpu(i)
	bogosum += cpu_data(i).udelay_val;
	printk("Total of %d Processors activated (%lu.%02lu BogoMIPS).\n",
	cpucount + 1,
	bogosum/(500000/HZ),
	(bogosum/(5000/HZ))%100);
	smp_activated = 1;
	smp_num_cpus = cpucount + 1;
	}

	/* Free unneeded trap tables */
	if (!cpu_isset(i, cpu_present_map)) {
	ClearPageReserved(virt_to_page(trapbase_cpu1));
	init_page_count(virt_to_page(trapbase_cpu1));
	free_page((unsigned long)trapbase_cpu1);
	totalram_pages++;
	num_physpages++;
	}
	if (!cpu_isset(2, cpu_present_map)) {
	ClearPageReserved(virt_to_page(trapbase_cpu2));
	init_page_count(virt_to_page(trapbase_cpu2));
	free_page((unsigned long)trapbase_cpu2);
	totalram_pages++;
	num_physpages++;
	}
	if (!cpu_isset(3, cpu_present_map)) {
	ClearPageReserved(virt_to_page(trapbase_cpu3));
	init_page_count(virt_to_page(trapbase_cpu3));
	free_page((unsigned long)trapbase_cpu3);
	totalram_pages++;
	num_physpages++;
	}

	/* Ok, they are spinning and ready to go. */
	smp_processors_ready = 1;
	}

	/* At each hardware IRQ, we get this called to forward IRQ reception
	* to the next processor. The caller must disable the IRQ level being
	* serviced globally so that there are no double interrupts received.
	*
	* XXX See sparc64 irq.c.
	*/
	void smp4m_irq_rotate(int cpu)
	{
	}

	/* Cross calls, in order to work efficiently and atomically do all
	* the message passing work themselves, only stopcpu and reschedule
	* messages come through here.
	*/
	void smp4m_message_pass(int target, int msg, unsigned long data, int wait)
	{
	static unsigned long smp_cpu_in_msg[NR_CPUS];
	cpumask_t mask;
	int me = smp_processor_id();
	int irq, i;

	if(msg == MSG_RESCHEDULE) {
	irq = IRQ_RESCHEDULE;

	if(smp_cpu_in_msg[me])
	return;
	} else if(msg == MSG_STOP_CPU) {
	irq = IRQ_STOP_CPU;
	} else {
	goto barf;
	}

	smp_cpu_in_msg[me]++;
	if(target == MSG_ALL_BUT_SELF \|\| target == MSG_ALL) {
	mask = cpu_present_map;
	if(target == MSG_ALL_BUT_SELF)
	cpu_clear(me, mask);
	for(i = 0; i < 4; i++) {
	if (cpu_isset(i, mask))
	set_cpu_int(i, irq);
	}
	} else {
	set_cpu_int(target, irq);
	}
	smp_cpu_in_msg[me]--;

	return;
	barf:
	printk("Yeeee, trying to send SMP msg(%d) on cpu %d\n", msg, me);
	panic("Bogon SMP message pass.");
	}

	static struct smp_funcall {
	smpfunc_t func;
	unsigned long arg1;
	unsigned long arg2;
	unsigned long arg3;
	unsigned long arg4;
	unsigned long arg5;
	unsigned long processors_in[NR_CPUS]; /* Set when ipi entered. */
	unsigned long processors_out[NR_CPUS]; /* Set when ipi exited. */
	} ccall_info;

	static DEFINE_SPINLOCK(cross_call_lock);

	/* Cross calls must be serialized, at least currently. */
	void smp4m_cross_call(smpfunc_t func, unsigned long arg1, unsigned long arg2,
	unsigned long arg3, unsigned long arg4, unsigned long arg5)
	{
	if(smp_processors_ready) {
	register int ncpus = smp_num_cpus;
	unsigned long flags;

	spin_lock_irqsave(&cross_call_lock, flags);

	/* Init function glue. */
	ccall_info.func = func;
	ccall_info.arg1 = arg1;
	ccall_info.arg2 = arg2;
	ccall_info.arg3 = arg3;
	ccall_info.arg4 = arg4;
	ccall_info.arg5 = arg5;

	/* Init receive/complete mapping, plus fire the IPI's off. */
	{
	cpumask_t mask = cpu_present_map;
	register int i;

	cpu_clear(smp_processor_id(), mask);
	for(i = 0; i < ncpus; i++) {
	if (cpu_isset(i, mask)) {
	ccall_info.processors_in[i] = 0;
	ccall_info.processors_out[i] = 0;
	set_cpu_int(i, IRQ_CROSS_CALL);
	} else {
	ccall_info.processors_in[i] = 1;
	ccall_info.processors_out[i] = 1;
	}
	}
	}

	{
	register int i;

	i = 0;
	do {
	while(!ccall_info.processors_in[i])
	barrier();
	} while(++i < ncpus);

	i = 0;
	do {
	while(!ccall_info.processors_out[i])
	barrier();
	} while(++i < ncpus);
	}

	spin_unlock_irqrestore(&cross_call_lock, flags);
	}
	}

	/* Running cross calls. */
	void smp4m_cross_call_irq(void)
	{
	int i = smp_processor_id();

	ccall_info.processors_in[i] = 1;
	ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
	ccall_info.arg4, ccall_info.arg5);
	ccall_info.processors_out[i] = 1;
	}

	void smp4m_percpu_timer_interrupt(struct pt_regs *regs)
	{
	int cpu = smp_processor_id();

	clear_profile_irq(cpu);

	profile_tick(CPU_PROFILING, regs);

	if(!--prof_counter(cpu)) {
	int user = user_mode(regs);

	irq_enter();
	update_process_times(user);
	irq_exit();

	prof_counter(cpu) = prof_multiplier(cpu);
	}
	}

	extern unsigned int lvl14_resolution;

	static void __init smp_setup_percpu_timer(void)
	{
	int cpu = smp_processor_id();

	prof_counter(cpu) = prof_multiplier(cpu) = 1;
	load_profile_irq(cpu, lvl14_resolution);

	if(cpu == boot_cpu_id)
	enable_pil_irq(14);
	}

	void __init smp4m_blackbox_id(unsigned *addr)
	{
	int rd = *addr & 0x3e000000;
	int rs1 = rd >> 11;

	addr[0] = 0x81580000 \| rd; /* rd %tbr, reg */
	addr[1] = 0x8130200c \| rd \| rs1; /* srl reg, 0xc, reg */
	addr[2] = 0x80082003 \| rd \| rs1; /* and reg, 3, reg */
	}

	void __init smp4m_blackbox_current(unsigned *addr)
	{
	int rd = *addr & 0x3e000000;
	int rs1 = rd >> 11;

	addr[0] = 0x81580000 \| rd; /* rd %tbr, reg */
	addr[2] = 0x8130200a \| rd \| rs1; /* srl reg, 0xa, reg */
	addr[4] = 0x8008200c \| rd \| rs1; /* and reg, 3, reg */
	}

	void __init sun4m_init_smp(void)
	{
	BTFIXUPSET_BLACKBOX(hard_smp_processor_id, smp4m_blackbox_id);
	BTFIXUPSET_BLACKBOX(load_current, smp4m_blackbox_current);
	BTFIXUPSET_CALL(smp_cross_call, smp4m_cross_call, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(smp_message_pass, smp4m_message_pass, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(__hard_smp_processor_id, __smp4m_processor_id, BTFIXUPCALL_NORM);
	}