/*
 *  include/asm-s390/sigp.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)
 *
 *  sigp.h by D.J. Barrow (c) IBM 1999
 *  contains routines / structures for signalling other S/390 processors in an
 *  SMP configuration.
 */

#ifndef __SIGP__
#define __SIGP__

#include <asm/ptrace.h>
#include <asm/atomic.h>

/* get real cpu address from logical cpu number */
extern volatile int __cpu_logical_map[];

typedef enum
{
	sigp_unassigned=0x0,
	sigp_sense,
	sigp_external_call,
	sigp_emergency_signal,
	sigp_start,
	sigp_stop,
	sigp_restart,
	sigp_unassigned1,
	sigp_unassigned2,
	sigp_stop_and_store_status,
	sigp_unassigned3,
	sigp_initial_cpu_reset,
	sigp_cpu_reset,
	sigp_set_prefix,
	sigp_store_status_at_address,
	sigp_store_extended_status_at_address
} sigp_order_code;

typedef __u32 sigp_status_word;

typedef enum
{
        sigp_order_code_accepted=0,
	sigp_status_stored,
	sigp_busy,
	sigp_not_operational
} sigp_ccode;


/*
 * Definitions for the external call
 */

/* 'Bit' signals, asynchronous */
typedef enum
{
	ec_schedule=0,
        ec_restart,
        ec_halt,
        ec_power_off,
        ec_ptlb,
	ec_bit_last
} ec_bit_sig;

/* Signals which come with a parameter area, synchronous */
typedef enum
{
        ec_callback_async,
        ec_callback_sync
} ec_cmd_sig;

/* state information for synchronous signals */
typedef enum
{
	ec_pending,
	ec_executing,
	ec_done
} ec_state;

/* header for the queuing of signals with a parameter area */
typedef struct ec_ext_call
{
	ec_cmd_sig cmd;
	atomic_t status;
	struct ec_ext_call *next;
        void (*func)(void *info);
        void *info;
} ec_ext_call;

/*
 * Signal processor
 */
extern __inline__ sigp_ccode
signal_processor(__u16 cpu_addr, sigp_order_code order_code)
{
	sigp_ccode ccode;

	__asm__ __volatile__(
		"    sr     1,1\n"        /* parameter=0 in gpr 1 */
		"    sigp   1,%1,0(%2)\n"
		"    ipm    %0\n"
		"    srl    %0,28\n"
		: "=d" (ccode)
		: "d" (__cpu_logical_map[cpu_addr]), "a" (order_code)
		: "cc" , "memory", "1" );
	return ccode;
}

/*
 * Signal processor with parameter
 */
extern __inline__ sigp_ccode
signal_processor_p(__u32 parameter,__u16 cpu_addr,sigp_order_code order_code)
{
	sigp_ccode ccode;
	
	__asm__ __volatile__(
		"    lr     1,%1\n"       /* parameter in gpr 1 */
		"    sigp   1,%2,0(%3)\n"
		"    ipm    %0\n"
		"    srl    %0,28\n"
		: "=d" (ccode)
		: "d" (parameter), "d" (__cpu_logical_map[cpu_addr]),
                  "a" (order_code)
		: "cc" , "memory", "1" );
	return ccode;
}

/*
 * Signal processor with parameter and return status
 */
extern __inline__ sigp_ccode
signal_processor_ps(__u32 *statusptr, __u32 parameter,
		    __u16 cpu_addr, sigp_order_code order_code)
{
	sigp_ccode ccode;
	
	__asm__ __volatile__(
		"    sr     2,2\n"        /* clear status so it doesn't contain rubbish if not saved. */
		"    lr     3,%2\n"       /* parameter in gpr 3 */
		"    sigp   2,%3,0(%4)\n"
		"    st     2,%1\n"
		"    ipm    %0\n"
		"    srl    %0,28\n"
		: "=d" (ccode), "=m" (*statusptr)
		: "d" (parameter), "d" (__cpu_logical_map[cpu_addr]),
                  "a" (order_code)
		: "cc" , "memory", "2" , "3"
		);
   return ccode;
}

#endif __SIGP__