[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>

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