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* This file is subject to the terms and conditions of the GNU General
* Public License. See the file "COPYING" in the main directory of this
* archive for more details.
* Copyright (C) 2000 - 2001 by Kanoj Sarcar (
* Copyright (C) 2000 - 2001 by Silicon Graphics, Inc.
* Copyright (C) 2000, 2001, 2002 Ralf Baechle
* Copyright (C) 2000, 2001 Broadcom Corporation
#ifndef __ASM_SMP_H
#define __ASM_SMP_H
#include <linux/config.h>
#include <linux/bitops.h>
#include <linux/linkage.h>
#include <linux/threads.h>
#include <linux/cpumask.h>
#include <asm/atomic.h>
#define raw_smp_processor_id() (current_thread_info()->cpu)
/* Map from cpu id to sequential logical cpu number. This will only
not be idempotent when cpus failed to come on-line. */
extern int __cpu_number_map[NR_CPUS];
#define cpu_number_map(cpu) __cpu_number_map[cpu]
/* The reverse map from sequential logical cpu number to cpu id. */
extern int __cpu_logical_map[NR_CPUS];
#define cpu_logical_map(cpu) __cpu_logical_map[cpu]
#define NO_PROC_ID (-1)
struct call_data_struct {
void (*func)(void *);
void *info;
atomic_t started;
atomic_t finished;
int wait;
extern struct call_data_struct *call_data;
#define SMP_RESCHEDULE_YOURSELF 0x1 /* XXX braindead */
extern cpumask_t phys_cpu_present_map;
extern cpumask_t cpu_online_map;
#define cpu_possible_map phys_cpu_present_map
extern cpumask_t cpu_callout_map;
/* We don't mark CPUs online until __cpu_up(), so we need another measure */
static inline int num_booting_cpus(void)
return cpus_weight(cpu_callout_map);
* These are defined by the board-specific code.
* Cause the function described by call_data to be executed on the passed
* cpu. When the function has finished, increment the finished field of
* call_data.
extern void core_send_ipi(int cpu, unsigned int action);
* Firmware CPU startup hook
extern void prom_boot_secondary(int cpu, struct task_struct *idle);
* After we've done initial boot, this function is called to allow the
* board code to clean up state, if needed
extern void prom_init_secondary(void);
* Populate cpu_possible_map before smp_init, called from setup_arch.
extern void plat_smp_setup(void);
* Called after init_IRQ but before __cpu_up.
extern void prom_prepare_cpus(unsigned int max_cpus);
* Last chance for the board code to finish SMP initialization before
* the CPU is "online".
extern void prom_smp_finish(void);
/* Hook for after all CPUs are online */
extern void prom_cpus_done(void);
extern void asmlinkage smp_bootstrap(void);
* this function sends a 'reschedule' IPI to another CPU.
* it goes straight through and wastes no time serializing
* anything. Worst case is that we lose a reschedule ...
static inline void smp_send_reschedule(int cpu)
core_send_ipi(cpu, SMP_RESCHEDULE_YOURSELF);
extern asmlinkage void smp_call_function_interrupt(void);
#endif /* CONFIG_SMP */
#endif /* __ASM_SMP_H */