xref: /openbmc/linux/arch/arm64/include/asm/smp.h (revision c4bc34d20273db698c51951a1951dba0a722e162)

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

#define raw_smp_processor_id() (current_thread_info()->cpu)

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;
};
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);

#ifdef CONFIG_ARM64_ACPI_PARKING_PROTOCOL
extern void arch_send_wakeup_ipi_mask(const struct cpumask *mask);
#else
static inline void arch_send_wakeup_ipi_mask(const struct cpumask *mask)
{
	BUILD_BUG();
}
#endif

extern int __cpu_disable(void);

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

static inline void cpu_park_loop(void)
{
	for (;;) {
		wfe();
		wfi();
	}
}

#endif /* ifndef __ASM_SMP_H */