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   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 */
  22 extern volatile int __cpu_logical_map[];
  23
  24 typedef 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
  44 typedef __u32 sigp_status_word;
  45
  46 typedef 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 */
  60 typedef enum
  61 {
  62         ec_schedule=0,
  63         ec_call_function,
  64         ec_bit_last
  65 } ec_bit_sig;
  66
  67 /*
  68  * Signal processor
  69  */
  70 extern __inline__ sigp_ccode
  71 signal_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  */
  89 extern __inline__ sigp_ccode
  90 signal_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  */
 110 extern __inline__ sigp_ccode
 111 signal_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__ */