LXR linux-bk/include/asm-s390/sigp.h

   1/*
   2 *  include/asm-s390/sigp.h
   3 *
   4 *  S390 version
   5 *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6 *    Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com),
   7 *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   8 *               Heiko Carstens (heiko.carstens@de.ibm.com)
   9 *
  10 *  sigp.h by D.J. Barrow (c) IBM 1999
  11 *  contains routines / structures for signalling other S/390 processors in an
  12 *  SMP configuration.
  13 */
  14
  15#ifndef __SIGP__
  16#define __SIGP__
  17
  18#include <asm/ptrace.h>
  19#include <asm/atomic.h>
  20
  21/* get real cpu address from logical cpu number */
  22extern volatile int __cpu_logical_map[];
  23
  24typedef enum
  25{
  26        sigp_unassigned=0x0,
  27        sigp_sense,
  28        sigp_external_call,
  29        sigp_emergency_signal,
  30        sigp_start,
  31        sigp_stop,
  32        sigp_restart,
  33        sigp_unassigned1,
  34        sigp_unassigned2,
  35        sigp_stop_and_store_status,
  36        sigp_unassigned3,
  37        sigp_initial_cpu_reset,
  38        sigp_cpu_reset,
  39        sigp_set_prefix,
  40        sigp_store_status_at_address,
  41        sigp_store_extended_status_at_address
  42} sigp_order_code;
  43
  44typedef __u32 sigp_status_word;
  45
  46typedef enum
  47{
  48        sigp_order_code_accepted=0,
  49        sigp_status_stored,
  50        sigp_busy,
  51        sigp_not_operational
  52} sigp_ccode;
  53
  54
  55/*
  56 * Definitions for the external call
  57 */
  58
  59/* 'Bit' signals, asynchronous */
  60typedef enum
  61{
  62        ec_schedule=0,
  63        ec_call_function,
  64        ec_bit_last
  65} ec_bit_sig;
  66
  67/*
  68 * Signal processor
  69 */
  70extern __inline__ sigp_ccode
  71signal_processor(__u16 cpu_addr, sigp_order_code order_code)
  72{
  73        sigp_ccode ccode;
  74
  75        __asm__ __volatile__(
  76                "    sr     1,1\n"        /* parameter=0 in gpr 1 */
  77                "    sigp   1,%1,0(%2)\n"
  78                "    ipm    %0\n"
  79                "    srl    %0,28\n"
  80                : "=d" (ccode)
  81                : "d" (__cpu_logical_map[cpu_addr]), "a" (order_code)
  82                : "cc" , "memory", "1" );
  83        return ccode;
  84}
  85
  86/*
  87 * Signal processor with parameter
  88 */
  89extern __inline__ sigp_ccode
  90signal_processor_p(__u32 parameter, __u16 cpu_addr,
  91                   sigp_order_code order_code)
  92{
  93        sigp_ccode ccode;
  94        
  95        __asm__ __volatile__(
  96                "    lr     1,%1\n"       /* parameter in gpr 1 */
  97                "    sigp   1,%2,0(%3)\n"
  98                "    ipm    %0\n"
  99                "    srl    %0,28\n"
 100                : "=d" (ccode)
 101                : "d" (parameter), "d" (__cpu_logical_map[cpu_addr]),
 102                  "a" (order_code)
 103                : "cc" , "memory", "1" );
 104        return ccode;
 105}
 106
 107/*
 108 * Signal processor with parameter and return status
 109 */
 110extern __inline__ sigp_ccode
 111signal_processor_ps(__u32 *statusptr, __u32 parameter,
 112                    __u16 cpu_addr, sigp_order_code order_code)
 113{
 114        sigp_ccode ccode;
 115        
 116        __asm__ __volatile__(
 117                "    sr     2,2\n"        /* clear status */
 118                "    lr     3,%2\n"       /* parameter in gpr 3 */
 119                "    sigp   2,%3,0(%4)\n"
 120                "    st     2,%1\n"
 121                "    ipm    %0\n"
 122                "    srl    %0,28\n"
 123                : "=d" (ccode), "=m" (*statusptr)
 124                : "d" (parameter), "d" (__cpu_logical_map[cpu_addr]),
 125                  "a" (order_code)
 126                : "cc" , "memory", "2" , "3"
 127                );
 128   return ccode;
 129}
 130
 131#endif /* __SIGP__ */
 132