arch/sparc/kernel/leon_smp.c - kernel/skids - Git at Google

 /* leon_smp.c: Sparc-Leon SMP support.
  *
  * based on sun4m_smp.c
  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
  * Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB
  * Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB
  */

 #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 <linux/pm.h>
 #include <linux/delay.h>
 #include <linux/gfp.h>

 #include <asm/cacheflush.h>
 #include <asm/tlbflush.h>

 #include <asm/ptrace.h>
 #include <asm/atomic.h>
 #include <asm/irq_regs.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>
 #include <asm/asi.h>
 #include <asm/leon.h>
 #include <asm/leon_amba.h>

 #ifdef CONFIG_SPARC_LEON

 #include "irq.h"

 extern ctxd_t *srmmu_ctx_table_phys;
 static int smp_processors_ready;
 extern volatile unsigned long cpu_callin_map[NR_CPUS];
 extern unsigned char boot_cpu_id;
 extern cpumask_t smp_commenced_mask;
 void __init leon_configure_cache_smp(void);

 static inline unsigned long do_swap(volatile unsigned long *ptr,
 				    unsigned long val)
 {
 	__asm__ __volatile__("swapa [%1] %2, %0\n\t" : "=&r"(val)
 			     : "r"(ptr), "i"(ASI_LEON_DCACHE_MISS)
 			     : "memory");
 	return val;
 }

 static void smp_setup_percpu_timer(void);

 void __cpuinit leon_callin(void)
 {
 	int cpuid = hard_smpleon_processor_id();

 	local_flush_cache_all();
 	local_flush_tlb_all();
 	leon_configure_cache_smp();

 	/* 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.
 	 */
 	do_swap(&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 (!cpu_isset(cpuid, smp_commenced_mask))
 		mb();

 	local_irq_enable();
 	cpu_set(cpuid, cpu_online_map);
 }

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

 extern struct linux_prom_registers smp_penguin_ctable;

 void __init leon_configure_cache_smp(void)
 {
 	unsigned long cfg = sparc_leon3_get_dcachecfg();
 	int me = smp_processor_id();

 	if (ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg) > 4) {
 		printk(KERN_INFO "Note: SMP with snooping only works on 4k cache, found %dk(0x%x) on cpu %d, disabling caches\n",
 		     (unsigned int)ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg),
 		     (unsigned int)cfg, (unsigned int)me);
 		sparc_leon3_disable_cache();
 	} else {
 		if (cfg & ASI_LEON3_SYSCTRL_CFG_SNOOPING) {
 			sparc_leon3_enable_snooping();
 		} else {
 			printk(KERN_INFO "Note: You have to enable snooping in the vhdl model cpu %d, disabling caches\n",
 			     me);
 			sparc_leon3_disable_cache();
 		}
 	}

 	local_flush_cache_all();
 	local_flush_tlb_all();
 }

 void leon_smp_setbroadcast(unsigned int mask)
 {
 	int broadcast =
 	    ((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
 	      LEON3_IRQMPSTATUS_BROADCAST) & 1);
 	if (!broadcast) {
 		prom_printf("######## !!!! The irqmp-ctrl must have broadcast enabled, smp wont work !!!!! ####### nr cpus: %d\n",
 		     leon_smp_nrcpus());
 		if (leon_smp_nrcpus() > 1) {
 			BUG();
 		} else {
 			prom_printf("continue anyway\n");
 			return;
 		}
 	}
 	LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpbroadcast), mask);
 }

 unsigned int leon_smp_getbroadcast(void)
 {
 	unsigned int mask;
 	mask = LEON_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpbroadcast));
 	return mask;
 }

 int leon_smp_nrcpus(void)
 {
 	int nrcpu =
 	    ((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
 	      LEON3_IRQMPSTATUS_CPUNR) & 0xf) + 1;
 	return nrcpu;
 }

 void __init leon_boot_cpus(void)
 {
 	int nrcpu = leon_smp_nrcpus();
 	int me = smp_processor_id();

 	printk(KERN_INFO "%d:(%d:%d) cpus mpirq at 0x%x\n", (unsigned int)me,
 	       (unsigned int)nrcpu, (unsigned int)NR_CPUS,
 	       (unsigned int)&(leon3_irqctrl_regs->mpstatus));

 	leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, me);
 	leon_enable_irq_cpu(LEON3_IRQ_TICKER, me);
 	leon_enable_irq_cpu(LEON3_IRQ_RESCHEDULE, me);

 	leon_smp_setbroadcast(1 << LEON3_IRQ_TICKER);

 	leon_configure_cache_smp();
 	smp_setup_percpu_timer();
 	local_flush_cache_all();

 }

 int __cpuinit leon_boot_one_cpu(int i)
 {

 	struct task_struct *p;
 	int timeout;

 	/* Cook up an idler for this guy. */
 	p = fork_idle(i);

 	current_set[i] = task_thread_info(p);

 	/* See trampoline.S:leon_smp_cpu_startup for details...
 	 * 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(KERN_INFO "Starting CPU %d : (irqmp: 0x%x)\n", (unsigned int)i,
 	       (unsigned int)&leon3_irqctrl_regs->mpstatus);
 	local_flush_cache_all();

 	LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpstatus), 1 << i);

 	/* wheee... it's going... */
 	for (timeout = 0; timeout < 10000; timeout++) {
 		if (cpu_callin_map[i])
 			break;
 		udelay(200);
 	}
 	printk(KERN_INFO "Started CPU %d\n", (unsigned int)i);

 	if (!(cpu_callin_map[i])) {
 		printk(KERN_ERR "Processor %d is stuck.\n", i);
 		return -ENODEV;
 	} else {
 		leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, i);
 		leon_enable_irq_cpu(LEON3_IRQ_TICKER, i);
 		leon_enable_irq_cpu(LEON3_IRQ_RESCHEDULE, i);
 	}

 	local_flush_cache_all();
 	return 0;
 }

 void __init leon_smp_done(void)
 {

 	int i, first;
 	int *prev;

 	/* setup cpu list for irq rotation */
 	first = 0;
 	prev = &first;
 	for (i = 0; i < NR_CPUS; i++) {
 		if (cpu_online(i)) {
 			*prev = i;
 			prev = &cpu_data(i).next;
 		}
 	}
 	*prev = first;
 	local_flush_cache_all();

 	/* Free unneeded trap tables */
 	if (!cpu_isset(1, 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;

 }

 void leon_irq_rotate(int cpu)
 {
 }

 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. */
 static void leon_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
 			    unsigned long arg2, unsigned long arg3,
 			    unsigned long arg4)
 {
 	if (smp_processors_ready) {
 		register int high = NR_CPUS - 1;
 		unsigned long flags;

 		spin_lock_irqsave(&cross_call_lock, flags);

 		{
 			/* If you make changes here, make sure gcc generates proper code... */
 			register smpfunc_t f asm("i0") = func;
 			register unsigned long a1 asm("i1") = arg1;
 			register unsigned long a2 asm("i2") = arg2;
 			register unsigned long a3 asm("i3") = arg3;
 			register unsigned long a4 asm("i4") = arg4;
 			register unsigned long a5 asm("i5") = 0;

 			__asm__ __volatile__("std %0, [%6]\n\t"
 					     "std %2, [%6 + 8]\n\t"
 					     "std %4, [%6 + 16]\n\t" : :
 					     "r"(f), "r"(a1), "r"(a2), "r"(a3),
 					     "r"(a4), "r"(a5),
 					     "r"(&ccall_info.func));
 		}

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

 			cpu_clear(smp_processor_id(), mask);
 			cpus_and(mask, cpu_online_map, mask);
 			for (i = 0; i <= high; i++) {
 				if (cpu_isset(i, mask)) {
 					ccall_info.processors_in[i] = 0;
 					ccall_info.processors_out[i] = 0;
 					set_cpu_int(i, LEON3_IRQ_CROSS_CALL);

 				}
 			}
 		}

 		{
 			register int i;

 			i = 0;
 			do {
 				if (!cpu_isset(i, mask))
 					continue;

 				while (!ccall_info.processors_in[i])
 					barrier();
 			} while (++i <= high);

 			i = 0;
 			do {
 				if (!cpu_isset(i, mask))
 					continue;

 				while (!ccall_info.processors_out[i])
 					barrier();
 			} while (++i <= high);
 		}

 		spin_unlock_irqrestore(&cross_call_lock, flags);
 	}
 }

 /* Running cross calls. */
 void leon_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 leon_percpu_timer_interrupt(struct pt_regs *regs)
 {
 	struct pt_regs *old_regs;
 	int cpu = smp_processor_id();

 	old_regs = set_irq_regs(regs);

 	leon_clear_profile_irq(cpu);

 	profile_tick(CPU_PROFILING);

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

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

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

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

 	prof_counter(cpu) = prof_multiplier(cpu) = 1;
 }

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

 	/* patch places where ___b_hard_smp_processor_id appears */
 	addr[0] = 0x81444000 | rd;	/* rd %asr17, reg */
 	addr[1] = 0x8130201c | rd | rs1;	/* srl reg, 0x1c, reg */
 	addr[2] = 0x01000000;	/* nop */
 }

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

 	/* patch LOAD_CURRENT macro where ___b_load_current appears */
 	addr[0] = 0x81444000 | rd;	/* rd %asr17, reg */
 	addr[2] = 0x8130201c | rd | rs1;	/* srl reg, 0x1c, reg */
 	addr[4] = 0x81282002 | rd | rs1;	/* sll reg, 0x2, reg */

 }

 /*
  * CPU idle callback function
  * See .../arch/sparc/kernel/process.c
  */
 void pmc_leon_idle(void)
 {
 	__asm__ volatile ("mov %g0, %asr19");
 }

 void __init leon_init_smp(void)
 {
 	/* Patch ipi15 trap table */
 	t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_leon - linux_trap_ipi15_sun4m);

 	BTFIXUPSET_BLACKBOX(hard_smp_processor_id, leon_blackbox_id);
 	BTFIXUPSET_BLACKBOX(load_current, leon_blackbox_current);
 	BTFIXUPSET_CALL(smp_cross_call, leon_cross_call, BTFIXUPCALL_NORM);
 	BTFIXUPSET_CALL(__hard_smp_processor_id, __leon_processor_id,
 			BTFIXUPCALL_NORM);

 #ifndef PMC_NO_IDLE
 	/* Assign power management IDLE handler */
 	pm_idle = pmc_leon_idle;
 	printk(KERN_INFO "leon: power management initialized\n");
 #endif

 }

 #endif /* CONFIG_SPARC_LEON */
	/* leon_smp.c: Sparc-Leon SMP support.
	*
	* based on sun4m_smp.c
	* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
	* Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB
	* Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB
	*/

	#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 <linux/pm.h>
	#include <linux/delay.h>
	#include <linux/gfp.h>

	#include <asm/cacheflush.h>
	#include <asm/tlbflush.h>

	#include <asm/ptrace.h>
	#include <asm/atomic.h>
	#include <asm/irq_regs.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>
	#include <asm/asi.h>
	#include <asm/leon.h>
	#include <asm/leon_amba.h>

	#ifdef CONFIG_SPARC_LEON

	#include "irq.h"

	extern ctxd_t *srmmu_ctx_table_phys;
	static int smp_processors_ready;
	extern volatile unsigned long cpu_callin_map[NR_CPUS];
	extern unsigned char boot_cpu_id;
	extern cpumask_t smp_commenced_mask;
	void __init leon_configure_cache_smp(void);

	static inline unsigned long do_swap(volatile unsigned long *ptr,
	unsigned long val)
	{
	__asm__ __volatile__("swapa [%1] %2, %0\n\t" : "=&r"(val)
	: "r"(ptr), "i"(ASI_LEON_DCACHE_MISS)
	: "memory");
	return val;
	}

	static void smp_setup_percpu_timer(void);

	void __cpuinit leon_callin(void)
	{
	int cpuid = hard_smpleon_processor_id();

	local_flush_cache_all();
	local_flush_tlb_all();
	leon_configure_cache_smp();

	/* 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.
	*/
	do_swap(&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 (!cpu_isset(cpuid, smp_commenced_mask))
	mb();

	local_irq_enable();
	cpu_set(cpuid, cpu_online_map);
	}

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

	extern struct linux_prom_registers smp_penguin_ctable;

	void __init leon_configure_cache_smp(void)
	{
	unsigned long cfg = sparc_leon3_get_dcachecfg();
	int me = smp_processor_id();

	if (ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg) > 4) {
	printk(KERN_INFO "Note: SMP with snooping only works on 4k cache, found %dk(0x%x) on cpu %d, disabling caches\n",
	(unsigned int)ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg),
	(unsigned int)cfg, (unsigned int)me);
	sparc_leon3_disable_cache();
	} else {
	if (cfg & ASI_LEON3_SYSCTRL_CFG_SNOOPING) {
	sparc_leon3_enable_snooping();
	} else {
	printk(KERN_INFO "Note: You have to enable snooping in the vhdl model cpu %d, disabling caches\n",
	me);
	sparc_leon3_disable_cache();
	}
	}

	local_flush_cache_all();
	local_flush_tlb_all();
	}

	void leon_smp_setbroadcast(unsigned int mask)
	{
	int broadcast =
	((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
	LEON3_IRQMPSTATUS_BROADCAST) & 1);
	if (!broadcast) {
	prom_printf("######## !!!! The irqmp-ctrl must have broadcast enabled, smp wont work !!!!! ####### nr cpus: %d\n",
	leon_smp_nrcpus());
	if (leon_smp_nrcpus() > 1) {
	BUG();
	} else {
	prom_printf("continue anyway\n");
	return;
	}
	}
	LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpbroadcast), mask);
	}

	unsigned int leon_smp_getbroadcast(void)
	{
	unsigned int mask;
	mask = LEON_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpbroadcast));
	return mask;
	}

	int leon_smp_nrcpus(void)
	{
	int nrcpu =
	((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
	LEON3_IRQMPSTATUS_CPUNR) & 0xf) + 1;
	return nrcpu;
	}

	void __init leon_boot_cpus(void)
	{
	int nrcpu = leon_smp_nrcpus();
	int me = smp_processor_id();

	printk(KERN_INFO "%d:(%d:%d) cpus mpirq at 0x%x\n", (unsigned int)me,
	(unsigned int)nrcpu, (unsigned int)NR_CPUS,
	(unsigned int)&(leon3_irqctrl_regs->mpstatus));

	leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, me);
	leon_enable_irq_cpu(LEON3_IRQ_TICKER, me);
	leon_enable_irq_cpu(LEON3_IRQ_RESCHEDULE, me);

	leon_smp_setbroadcast(1 << LEON3_IRQ_TICKER);

	leon_configure_cache_smp();
	smp_setup_percpu_timer();
	local_flush_cache_all();

	}

	int __cpuinit leon_boot_one_cpu(int i)
	{

	struct task_struct *p;
	int timeout;

	/* Cook up an idler for this guy. */
	p = fork_idle(i);

	current_set[i] = task_thread_info(p);

	/* See trampoline.S:leon_smp_cpu_startup for details...
	* 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(KERN_INFO "Starting CPU %d : (irqmp: 0x%x)\n", (unsigned int)i,
	(unsigned int)&leon3_irqctrl_regs->mpstatus);
	local_flush_cache_all();

	LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpstatus), 1 << i);

	/* wheee... it's going... */
	for (timeout = 0; timeout < 10000; timeout++) {
	if (cpu_callin_map[i])
	break;
	udelay(200);
	}
	printk(KERN_INFO "Started CPU %d\n", (unsigned int)i);

	if (!(cpu_callin_map[i])) {
	printk(KERN_ERR "Processor %d is stuck.\n", i);
	return -ENODEV;
	} else {
	leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, i);
	leon_enable_irq_cpu(LEON3_IRQ_TICKER, i);
	leon_enable_irq_cpu(LEON3_IRQ_RESCHEDULE, i);
	}

	local_flush_cache_all();
	return 0;
	}

	void __init leon_smp_done(void)
	{

	int i, first;
	int *prev;

	/* setup cpu list for irq rotation */
	first = 0;
	prev = &first;
	for (i = 0; i < NR_CPUS; i++) {
	if (cpu_online(i)) {
	*prev = i;
	prev = &cpu_data(i).next;
	}
	}
	*prev = first;
	local_flush_cache_all();

	/* Free unneeded trap tables */
	if (!cpu_isset(1, 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;

	}

	void leon_irq_rotate(int cpu)
	{
	}

	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. */
	static void leon_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
	unsigned long arg2, unsigned long arg3,
	unsigned long arg4)
	{
	if (smp_processors_ready) {
	register int high = NR_CPUS - 1;
	unsigned long flags;

	spin_lock_irqsave(&cross_call_lock, flags);

	{
	/* If you make changes here, make sure gcc generates proper code... */
	register smpfunc_t f asm("i0") = func;
	register unsigned long a1 asm("i1") = arg1;
	register unsigned long a2 asm("i2") = arg2;
	register unsigned long a3 asm("i3") = arg3;
	register unsigned long a4 asm("i4") = arg4;
	register unsigned long a5 asm("i5") = 0;

	__asm__ __volatile__("std %0, [%6]\n\t"
	"std %2, [%6 + 8]\n\t"
	"std %4, [%6 + 16]\n\t" : :
	"r"(f), "r"(a1), "r"(a2), "r"(a3),
	"r"(a4), "r"(a5),
	"r"(&ccall_info.func));
	}

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

	cpu_clear(smp_processor_id(), mask);
	cpus_and(mask, cpu_online_map, mask);
	for (i = 0; i <= high; i++) {
	if (cpu_isset(i, mask)) {
	ccall_info.processors_in[i] = 0;
	ccall_info.processors_out[i] = 0;
	set_cpu_int(i, LEON3_IRQ_CROSS_CALL);

	}
	}
	}

	{
	register int i;

	i = 0;
	do {
	if (!cpu_isset(i, mask))
	continue;

	while (!ccall_info.processors_in[i])
	barrier();
	} while (++i <= high);

	i = 0;
	do {
	if (!cpu_isset(i, mask))
	continue;

	while (!ccall_info.processors_out[i])
	barrier();
	} while (++i <= high);
	}

	spin_unlock_irqrestore(&cross_call_lock, flags);
	}
	}

	/* Running cross calls. */
	void leon_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 leon_percpu_timer_interrupt(struct pt_regs *regs)
	{
	struct pt_regs *old_regs;
	int cpu = smp_processor_id();

	old_regs = set_irq_regs(regs);

	leon_clear_profile_irq(cpu);

	profile_tick(CPU_PROFILING);

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

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

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

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

	prof_counter(cpu) = prof_multiplier(cpu) = 1;
	}

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

	/* patch places where ___b_hard_smp_processor_id appears */
	addr[0] = 0x81444000 \| rd; /* rd %asr17, reg */
	addr[1] = 0x8130201c \| rd \| rs1; /* srl reg, 0x1c, reg */
	addr[2] = 0x01000000; /* nop */
	}

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

	/* patch LOAD_CURRENT macro where ___b_load_current appears */
	addr[0] = 0x81444000 \| rd; /* rd %asr17, reg */
	addr[2] = 0x8130201c \| rd \| rs1; /* srl reg, 0x1c, reg */
	addr[4] = 0x81282002 \| rd \| rs1; /* sll reg, 0x2, reg */

	}

	/*
	* CPU idle callback function
	* See .../arch/sparc/kernel/process.c
	*/
	void pmc_leon_idle(void)
	{
	__asm__ volatile ("mov %g0, %asr19");
	}

	void __init leon_init_smp(void)
	{
	/* Patch ipi15 trap table */
	t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_leon - linux_trap_ipi15_sun4m);

	BTFIXUPSET_BLACKBOX(hard_smp_processor_id, leon_blackbox_id);
	BTFIXUPSET_BLACKBOX(load_current, leon_blackbox_current);
	BTFIXUPSET_CALL(smp_cross_call, leon_cross_call, BTFIXUPCALL_NORM);
	BTFIXUPSET_CALL(__hard_smp_processor_id, __leon_processor_id,
	BTFIXUPCALL_NORM);

	#ifndef PMC_NO_IDLE
	/* Assign power management IDLE handler */
	pm_idle = pmc_leon_idle;
	printk(KERN_INFO "leon: power management initialized\n");
	#endif

	}

	#endif /* CONFIG_SPARC_LEON */