include/asm-s390/smp.h

/*
 *  include/asm-s390/smp.h
 *
 *  S390 version
 *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
 *    Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
 *               Martin Schwidefsky (schwidefsky@de.ibm.com)
 */
#ifndef __ASM_SMP_H
#define __ASM_SMP_H

#include <linux/config.h>

#if defined(__KERNEL__) && defined(CONFIG_SMP) && !defined(__ASSEMBLY__)

#include <asm/lowcore.h>

/*
  s390 specific smp.c headers
 */
typedef struct
{
	int        intresting;
	sigp_ccode ccode; 
	__u32      status;
	__u16      cpu;
} sigp_info;

extern int smp_call_function_on(void (*func) (void *info), void *info,
				int nonatomic, int wait, int cpu);

extern unsigned long cpu_online_map;

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

/*
 *	This magic constant controls our willingness to transfer
 *	a process across CPUs. Such a transfer incurs misses on the L1
 *	cache, and on a P6 or P5 with multiple L2 caches L2 hits. My
 *	gut feeling is this will vary by board in value. For a board
 *	with separate L2 cache it probably depends also on the RSS, and
 *	for a board with shared L2 cache it ought to decay fast as other
 *	processes are run.
 */
 
#define PROC_CHANGE_PENALTY	20		/* Schedule penalty */

#define smp_processor_id() (current->processor)

extern __inline__ int cpu_logical_map(int cpu)
{
	return cpu;
}

extern __inline__ int cpu_number_map(int cpu)
{
	return cpu;
}

extern __inline__ __u16 hard_smp_processor_id(void)
{
	__u16 cpu_address;
 
	__asm__ ("stap %0\n" : "=m" (cpu_address));
	return cpu_address;
}

#define cpu_logical_map(cpu) (cpu)

#endif

#ifndef CONFIG_SMP
#define smp_call_function_on(func,info,nonatomic,wait,cpu)      ({ 0; })
#endif

#endif