/*
 * Copyright (C) 2012 ARM Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef __ASM_SMP_H
#define __ASM_SMP_H

#include <asm/percpu.h>

#include <linux/threads.h>
#include <linux/cpumask.h>
#include <linux/thread_info.h>

DECLARE_PER_CPU_READ_MOSTLY(int, cpu_number);

/*
 * We don't use this_cpu_read(cpu_number) as that has implicit writes to
 * preempt_count, and associated (compiler) barriers, that we'd like to avoid
 * the expense of. If we're preemptible, the value can be stale at use anyway.
 * And we can't use this_cpu_ptr() either, as that winds up recursing back
 * here under CONFIG_DEBUG_PREEMPT=y.
 */
#define raw_smp_processor_id() (*raw_cpu_ptr(&cpu_number))

struct seq_file;

/*
 * generate IPI list text
 */
extern void show_ipi_list(struct seq_file *p, int prec);

/*
 * Called from C code, this handles an IPI.
 */
extern void handle_IPI(int ipinr, struct pt_regs *regs);

/*
 * Discover the set of possible CPUs and determine their
 * SMP operations.
 */
extern void smp_init_cpus(void);

/*
 * Provide a function to raise an IPI cross call on CPUs in callmap.
 */
extern void set_smp_cross_call(void (*)(const struct cpumask *, unsigned int));

extern void (*__smp_cross_call)(const struct cpumask *, unsigned int);

/*
 * Called from the secondary holding pen, this is the secondary CPU entry point.
 */
asmlinkage void secondary_start_kernel(void);

/*
 * Initial data for bringing up a secondary CPU.
 */
struct secondary_data {
	void *stack;
#ifdef CONFIG_THREAD_INFO_IN_TASK
	struct task_struct *task;
#endif
};
extern struct secondary_data secondary_data;
extern void secondary_entry(void);

extern void arch_send_call_function_single_ipi(int cpu);
extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
extern void arch_send_wakeup_ipi_mask(const struct cpumask *mask);

extern int __cpu_disable(void);

extern void __cpu_die(unsigned int cpu);
extern void cpu_die(void);

#endif /* ifndef __ASM_SMP_H */