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

/* 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/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>

#include "kernel.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 [%2] %3, %0\n\t" : "=&r"(val)
			     : "0"(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 */

}

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);
}

#endif /* CONFIG_SPARC_LEON */
Commit	Line	Data
8401707f KE	1	/* leon_smp.c: Sparc-Leon SMP support.
	2	*
	3	* based on sun4m_smp.c
	4	* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
	5	* Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB
	6	* Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB
	7	*/
	8
	9	#include <asm/head.h>
	10
	11	#include <linux/kernel.h>
	12	#include <linux/sched.h>
	13	#include <linux/threads.h>
	14	#include <linux/smp.h>
8401707f KE	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/swap.h>
	21	#include <linux/profile.h>
	22	#include <linux/pm.h>
	23	#include <linux/delay.h>
5a0e3ad6	24	#include <linux/gfp.h>
8401707f KE	25
	26	#include <asm/cacheflush.h>
	27	#include <asm/tlbflush.h>
	28
	29	#include <asm/ptrace.h>
	30	#include <asm/atomic.h>
	31	#include <asm/irq_regs.h>
	32
	33	#include <asm/delay.h>
	34	#include <asm/irq.h>
	35	#include <asm/page.h>
	36	#include <asm/pgalloc.h>
	37	#include <asm/pgtable.h>
	38	#include <asm/oplib.h>
	39	#include <asm/cpudata.h>
	40	#include <asm/asi.h>
	41	#include <asm/leon.h>
	42	#include <asm/leon_amba.h>
	43
a2a211cb SR	44	#include "kernel.h"
a2a211cb SR	45
8401707f KE	46	#ifdef CONFIG_SPARC_LEON
	47
	48	#include "irq.h"
	49
	50	extern ctxd_t *srmmu_ctx_table_phys;
	51	static int smp_processors_ready;
	52	extern volatile unsigned long cpu_callin_map[NR_CPUS];
	53	extern unsigned char boot_cpu_id;
	54	extern cpumask_t smp_commenced_mask;
	55	void __init leon_configure_cache_smp(void);
	56
	57	static inline unsigned long do_swap(volatile unsigned long *ptr,
	58	unsigned long val)
	59	{
502279a7 DH	60	__asm__ __volatile__("swapa [%2] %3, %0\n\t" : "=&r"(val)
502279a7 DH	61	: "0"(val), "r"(ptr), "i"(ASI_LEON_DCACHE_MISS)
8401707f KE	62	: "memory");
	63	return val;
	64	}
	65
	66	static void smp_setup_percpu_timer(void);
	67
	68	void __cpuinit leon_callin(void)
	69	{
	70	int cpuid = hard_smpleon_processor_id();
	71
	72	local_flush_cache_all();
	73	local_flush_tlb_all();
	74	leon_configure_cache_smp();
	75
	76	/* Get our local ticker going. */
	77	smp_setup_percpu_timer();
	78
	79	calibrate_delay();
	80	smp_store_cpu_info(cpuid);
	81
	82	local_flush_cache_all();
	83	local_flush_tlb_all();
	84
	85	/*
	86	* Unblock the master CPU _only_ when the scheduler state
	87	* of all secondary CPUs will be up-to-date, so after
	88	* the SMP initialization the master will be just allowed
	89	* to call the scheduler code.
	90	* Allow master to continue.
	91	*/
	92	do_swap(&cpu_callin_map[cpuid], 1);
	93
	94	local_flush_cache_all();
	95	local_flush_tlb_all();
	96
	97	cpu_probe();
	98
	99	/* Fix idle thread fields. */
	100	__asm__ __volatile__("ld [%0], %%g6\n\t" : : "r"(&current_set[cpuid])
	101	: "memory" /* paranoid */);
	102
	103	/* Attach to the address space of init_task. */
	104	atomic_inc(&init_mm.mm_count);
	105	current->active_mm = &init_mm;
	106
	107	while (!cpu_isset(cpuid, smp_commenced_mask))
	108	mb();
	109
	110	local_irq_enable();
	111	cpu_set(cpuid, cpu_online_map);
	112	}
	113
	114	/*
	115	* Cycle through the processors asking the PROM to start each one.
	116	*/
	117
	118	extern struct linux_prom_registers smp_penguin_ctable;
	119
	120	void __init leon_configure_cache_smp(void)
	121	{
	122	unsigned long cfg = sparc_leon3_get_dcachecfg();
	123	int me = smp_processor_id();
	124
	125	if (ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg) > 4) {
126	printk(KERN_INFO "Note: SMP with snooping only works on 4k cache, found %dk(0x%x) on cpu %d, disabling caches\n",
127	(unsigned int)ASI_LEON3_SYSCTRL_CFG_SSIZE(cfg),
128	(unsigned int)cfg, (unsigned int)me);
129	sparc_leon3_disable_cache();
130	} else {
131	if (cfg & ASI_LEON3_SYSCTRL_CFG_SNOOPING) {
132	sparc_leon3_enable_snooping();
133	} else {
134	printk(KERN_INFO "Note: You have to enable snooping in the vhdl model cpu %d, disabling caches\n",
135	me);
136	sparc_leon3_disable_cache();
137	}
138	}
139
140	local_flush_cache_all();
141	local_flush_tlb_all();
142	}
143
144	void leon_smp_setbroadcast(unsigned int mask)
145	{
146	int broadcast =
147	((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
148	LEON3_IRQMPSTATUS_BROADCAST) & 1);
149	if (!broadcast) {
150	prom_printf("######## !!!! The irqmp-ctrl must have broadcast enabled, smp wont work !!!!! ####### nr cpus: %d\n",
151	leon_smp_nrcpus());
152	if (leon_smp_nrcpus() > 1) {
153	BUG();
154	} else {
155	prom_printf("continue anyway\n");
156	return;
157	}
158	}
159	LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpbroadcast), mask);
160	}
161
162	unsigned int leon_smp_getbroadcast(void)
163	{
164	unsigned int mask;
165	mask = LEON_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpbroadcast));
166	return mask;
167	}
168
169	int leon_smp_nrcpus(void)
170	{
171	int nrcpu =
172	((LEON3_BYPASS_LOAD_PA(&(leon3_irqctrl_regs->mpstatus)) >>
173	LEON3_IRQMPSTATUS_CPUNR) & 0xf) + 1;
174	return nrcpu;
175	}
176
177	void __init leon_boot_cpus(void)
178	{
179	int nrcpu = leon_smp_nrcpus();
180	int me = smp_processor_id();
181
0da2b300	182	printk(KERN_INFO "%d:(%d:%d) cpus mpirq at 0x%x\n", (unsigned int)me,
8401707f KE	183	(unsigned int)nrcpu, (unsigned int)NR_CPUS,
	184	(unsigned int)&(leon3_irqctrl_regs->mpstatus));
	185
	186	leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, me);
	187	leon_enable_irq_cpu(LEON3_IRQ_TICKER, me);
	188	leon_enable_irq_cpu(LEON3_IRQ_RESCHEDULE, me);
	189
	190	leon_smp_setbroadcast(1 << LEON3_IRQ_TICKER);
	191
	192	leon_configure_cache_smp();
	193	smp_setup_percpu_timer();
	194	local_flush_cache_all();
	195
	196	}
	197
	198	int __cpuinit leon_boot_one_cpu(int i)
	199	{
	200
	201	struct task_struct *p;
	202	int timeout;
	203
	204	/* Cook up an idler for this guy. */
	205	p = fork_idle(i);
	206
	207	current_set[i] = task_thread_info(p);
	208
	209	/* See trampoline.S:leon_smp_cpu_startup for details...
	210	* Initialize the contexts table
	211	* Since the call to prom_startcpu() trashes the structure,
	212	* we need to re-initialize it for each cpu
	213	*/
	214	smp_penguin_ctable.which_io = 0;
	215	smp_penguin_ctable.phys_addr = (unsigned int)srmmu_ctx_table_phys;
	216	smp_penguin_ctable.reg_size = 0;
	217
	218	/* whirrr, whirrr, whirrrrrrrrr... */
	219	printk(KERN_INFO "Starting CPU %d : (irqmp: 0x%x)\n", (unsigned int)i,
	220	(unsigned int)&leon3_irqctrl_regs->mpstatus);
	221	local_flush_cache_all();
	222
	223	LEON_BYPASS_STORE_PA(&(leon3_irqctrl_regs->mpstatus), 1 << i);
	224
	225	/* wheee... it's going... */
	226	for (timeout = 0; timeout < 10000; timeout++) {
	227	if (cpu_callin_map[i])
	228	break;
	229	udelay(200);
	230	}
0da2b300	231	printk(KERN_INFO "Started CPU %d\n", (unsigned int)i);
8401707f KE	232
	233	if (!(cpu_callin_map[i])) {
	234	printk(KERN_ERR "Processor %d is stuck.\n", i);
	235	return -ENODEV;
	236	} else {
	237	leon_enable_irq_cpu(LEON3_IRQ_CROSS_CALL, i);
	238	leon_enable_irq_cpu(LEON3_IRQ_TICKER, i);
	239	leon_enable_irq_cpu(LEON3_IRQ_RESCHEDULE, i);
	240	}
	241
	242	local_flush_cache_all();
	243	return 0;
	244	}
	245
	246	void __init leon_smp_done(void)
	247	{
	248
	249	int i, first;
	250	int *prev;
	251
	252	/* setup cpu list for irq rotation */
	253	first = 0;
	254	prev = &first;
	255	for (i = 0; i < NR_CPUS; i++) {
	256	if (cpu_online(i)) {
	257	*prev = i;
	258	prev = &cpu_data(i).next;
	259	}
	260	}
	261	*prev = first;
	262	local_flush_cache_all();
	263
	264	/* Free unneeded trap tables */
	265	if (!cpu_isset(1, cpu_present_map)) {
a2a211cb SR	266	ClearPageReserved(virt_to_page(&trapbase_cpu1));
	267	init_page_count(virt_to_page(&trapbase_cpu1));
	268	free_page((unsigned long)&trapbase_cpu1);
8401707f KE	269	totalram_pages++;
	270	num_physpages++;
	271	}
	272	if (!cpu_isset(2, cpu_present_map)) {
a2a211cb SR	273	ClearPageReserved(virt_to_page(&trapbase_cpu2));
	274	init_page_count(virt_to_page(&trapbase_cpu2));
	275	free_page((unsigned long)&trapbase_cpu2);
8401707f KE	276	totalram_pages++;
	277	num_physpages++;
	278	}
	279	if (!cpu_isset(3, cpu_present_map)) {
a2a211cb SR	280	ClearPageReserved(virt_to_page(&trapbase_cpu3));
	281	init_page_count(virt_to_page(&trapbase_cpu3));
	282	free_page((unsigned long)&trapbase_cpu3);
8401707f KE	283	totalram_pages++;
	284	num_physpages++;
	285	}
	286	/* Ok, they are spinning and ready to go. */
	287	smp_processors_ready = 1;
	288
	289	}
	290
	291	void leon_irq_rotate(int cpu)
	292	{
	293	}
	294
	295	static struct smp_funcall {
	296	smpfunc_t func;
	297	unsigned long arg1;
	298	unsigned long arg2;
	299	unsigned long arg3;
	300	unsigned long arg4;
	301	unsigned long arg5;
	302	unsigned long processors_in[NR_CPUS]; /* Set when ipi entered. */
	303	unsigned long processors_out[NR_CPUS]; /* Set when ipi exited. */
	304	} ccall_info;
	305
	306	static DEFINE_SPINLOCK(cross_call_lock);
	307
	308	/* Cross calls must be serialized, at least currently. */
	309	static void leon_cross_call(smpfunc_t func, cpumask_t mask, unsigned long arg1,
	310	unsigned long arg2, unsigned long arg3,
	311	unsigned long arg4)
	312	{
	313	if (smp_processors_ready) {
	314	register int high = NR_CPUS - 1;
	315	unsigned long flags;
	316
	317	spin_lock_irqsave(&cross_call_lock, flags);
	318
	319	{
	320	/* If you make changes here, make sure gcc generates proper code... */
	321	register smpfunc_t f asm("i0") = func;
	322	register unsigned long a1 asm("i1") = arg1;
	323	register unsigned long a2 asm("i2") = arg2;
	324	register unsigned long a3 asm("i3") = arg3;
	325	register unsigned long a4 asm("i4") = arg4;
	326	register unsigned long a5 asm("i5") = 0;
	327
	328	__asm__ __volatile__("std %0, [%6]\n\t"
	329	"std %2, [%6 + 8]\n\t"
	330	"std %4, [%6 + 16]\n\t" : :
	331	"r"(f), "r"(a1), "r"(a2), "r"(a3),
	332	"r"(a4), "r"(a5),
	333	"r"(&ccall_info.func));
	334	}
	335
	336	/* Init receive/complete mapping, plus fire the IPI's off. */
	337	{
	338	register int i;
	339
	340	cpu_clear(smp_processor_id(), mask);
	341	cpus_and(mask, cpu_online_map, mask);
	342	for (i = 0; i <= high; i++) {
	343	if (cpu_isset(i, mask)) {
	344	ccall_info.processors_in[i] = 0;
	345	ccall_info.processors_out[i] = 0;
	346	set_cpu_int(i, LEON3_IRQ_CROSS_CALL);
347
348	}
349	}
350	}
351
352	{
353	register int i;
354
355	i = 0;
356	do {
357	if (!cpu_isset(i, mask))
358	continue;
359
360	while (!ccall_info.processors_in[i])
361	barrier();
362	} while (++i <= high);
363
364	i = 0;
365	do {
366	if (!cpu_isset(i, mask))
367	continue;
368
369	while (!ccall_info.processors_out[i])
370	barrier();
371	} while (++i <= high);
372	}
373
374	spin_unlock_irqrestore(&cross_call_lock, flags);
375	}
376	}
377
378	/* Running cross calls. */
379	void leon_cross_call_irq(void)
380	{
381	int i = smp_processor_id();
382
383	ccall_info.processors_in[i] = 1;
384	ccall_info.func(ccall_info.arg1, ccall_info.arg2, ccall_info.arg3,
385	ccall_info.arg4, ccall_info.arg5);
386	ccall_info.processors_out[i] = 1;
387	}
388
389	void leon_percpu_timer_interrupt(struct pt_regs *regs)
390	{
391	struct pt_regs *old_regs;
392	int cpu = smp_processor_id();
393
394	old_regs = set_irq_regs(regs);
395
396	leon_clear_profile_irq(cpu);
397
398	profile_tick(CPU_PROFILING);
399
400	if (!--prof_counter(cpu)) {
401	int user = user_mode(regs);
402
403	irq_enter();
404	update_process_times(user);
405	irq_exit();
406
407	prof_counter(cpu) = prof_multiplier(cpu);
408	}
409	set_irq_regs(old_regs);
410	}
411
412	static void __init smp_setup_percpu_timer(void)
413	{
414	int cpu = smp_processor_id();
415
416	prof_counter(cpu) = prof_multiplier(cpu) = 1;
417	}
418
419	void __init leon_blackbox_id(unsigned *addr)
420	{
421	int rd = *addr & 0x3e000000;
422	int rs1 = rd >> 11;
423
424	/* patch places where ___b_hard_smp_processor_id appears */
425	addr[0] = 0x81444000 \| rd; /* rd %asr17, reg */
426	addr[1] = 0x8130201c \| rd \| rs1; /* srl reg, 0x1c, reg */
427	addr[2] = 0x01000000; /* nop */
428	}
429
430	void __init leon_blackbox_current(unsigned *addr)
431	{
432	int rd = *addr & 0x3e000000;
433	int rs1 = rd >> 11;
434
435	/* patch LOAD_CURRENT macro where ___b_load_current appears */
436	addr[0] = 0x81444000 \| rd; /* rd %asr17, reg */
437	addr[2] = 0x8130201c \| rd \| rs1; /* srl reg, 0x1c, reg */
438	addr[4] = 0x81282002 \| rd \| rs1; /* sll reg, 0x2, reg */
439
440	}
441
8401707f KE	442	void __init leon_init_smp(void)
	443	{
	444	/* Patch ipi15 trap table */
	445	t_nmi[1] = t_nmi[1] + (linux_trap_ipi15_leon - linux_trap_ipi15_sun4m);
	446
	447	BTFIXUPSET_BLACKBOX(hard_smp_processor_id, leon_blackbox_id);
	448	BTFIXUPSET_BLACKBOX(load_current, leon_blackbox_current);
	449	BTFIXUPSET_CALL(smp_cross_call, leon_cross_call, BTFIXUPCALL_NORM);
	450	BTFIXUPSET_CALL(__hard_smp_processor_id, __leon_processor_id,
	451	BTFIXUPCALL_NORM);
8401707f KE	452	}
	453
	454	#endif /* CONFIG_SPARC_LEON */