/* 
 * smp.h: PPC64 specific SMP code.
 *
 * Original was a copy of sparc smp.h.  Now heavily modified
 * for PPC.
 *
 * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
 * Copyright (C) 1996-2001 Cort Dougan <cort@fsmlabs.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#ifdef __KERNEL__
#ifndef _PPC64_SMP_H
#define _PPC64_SMP_H

#include <linux/config.h>
#include <linux/threads.h>
#include <linux/kernel.h>

#ifdef CONFIG_SMP

#ifndef __ASSEMBLY__

#include <asm/paca.h>

extern unsigned long cpu_online_map;

extern void smp_message_pass(int target, int msg, unsigned long data, int wait);
extern void smp_send_tlb_invalidate(int);
extern void smp_send_xmon_break(int cpu);
struct pt_regs;
extern void smp_message_recv(int, struct pt_regs *);
extern void smp_send_reschedule_all(void);

#define NO_PROC_ID		0xFF            /* No processor magic marker */

#define cpu_online(cpu)	test_bit((cpu), &cpu_online_map)

#define cpu_possible(cpu)	paca[cpu].active

static inline int num_online_cpus(void)
{
	int i, nr = 0;

	for (i = 0; i < NR_CPUS; i++)
		nr += test_bit(i, &cpu_online_map);

	return nr;
}

extern volatile unsigned int cpu_callin_map[NR_CPUS];

#define smp_processor_id() (get_paca()->xPacaIndex)

/* Since OpenPIC has only 4 IPIs, we use slightly different message numbers.
 *
 * Make sure this matches openpic_request_IPIs in open_pic.c, or what shows up
 * in /proc/interrupts will be wrong!!! --Troy */
#define PPC_MSG_CALL_FUNCTION   0
#define PPC_MSG_RESCHEDULE      1
#define PPC_MSG_MIGRATE_TASK    2
#define PPC_MSG_XMON_BREAK      3

void smp_init_iSeries(void);
void smp_init_pSeries(void);

#endif /* __ASSEMBLY__ */
#endif /* !(CONFIG_SMP) */
#endif /* !(_PPC64_SMP_H) */
#endif /* __KERNEL__ */