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  *
   9  *  sigp.h by D.J. Barrow (c) IBM 1999
  10  *  contains routines / structures for signalling other S/390 processors in an
  11  *  SMP configuration.
  12  */
  13
  14 #ifndef __SIGP__
  15 #define __SIGP__
  16
  17 #include <asm/ptrace.h>
  18 #include <asm/atomic.h>
  19
  20 /* get real cpu address from logical cpu number */
  21 extern volatile int __cpu_logical_map[];
  22
  23 typedef enum
  24 {
  25         sigp_unassigned=0x0,
  26         sigp_sense,
  27         sigp_external_call,
  28         sigp_emergency_signal,
  29         sigp_start,
  30         sigp_stop,
  31         sigp_restart,
  32         sigp_unassigned1,
  33         sigp_unassigned2,
  34         sigp_stop_and_store_status,
  35         sigp_unassigned3,
  36         sigp_initial_cpu_reset,
  37         sigp_cpu_reset,
  38         sigp_set_prefix,
  39         sigp_store_status_at_address,
  40         sigp_store_extended_status_at_address
  41 } sigp_order_code;
  42
  43 typedef __u32 sigp_status_word;
  44
  45 typedef enum
  46 {
  47         sigp_order_code_accepted=0,
  48         sigp_status_stored,
  49         sigp_busy,
  50         sigp_not_operational
  51 } sigp_ccode;
  52
  53
  54 /*
  55  * Definitions for the external call
  56  */
  57
  58 /* 'Bit' signals, asynchronous */
  59 typedef enum
  60 {
  61         ec_schedule=0,
  62         ec_call_function,
  63         ec_bit_last
  64 } ec_bit_sig;
  65
  66 /*
  67  * Signal processor
  68  */
  69 extern __inline__ sigp_ccode
  70 signal_processor(__u16 cpu_addr, sigp_order_code order_code)
  71 {
  72         sigp_ccode ccode;
  73
  74         __asm__ __volatile__(
  75                 "    sr     1,1\n"        /* parameter=0 in gpr 1 */
  76                 "    sigp   1,%1,0(%2)\n"
  77                 "    ipm    %0\n"
  78                 "    srl    %0,28\n"
  79                 : "=d" (ccode)
  80                 : "d" (__cpu_logical_map[cpu_addr]), "a" (order_code)
  81                 : "cc" , "memory", "1" );
  82         return ccode;
  83 }
  84
  85 /*
  86  * Signal processor with parameter
  87  */
  88 extern __inline__ sigp_ccode
  89 signal_processor_p(__u32 parameter,__u16 cpu_addr,sigp_order_code order_code)
  90 {
  91         sigp_ccode ccode;
  92
  93         __asm__ __volatile__(
  94                 "    lr     1,%1\n"       /* parameter in gpr 1 */
  95                 "    sigp   1,%2,0(%3)\n"
  96                 "    ipm    %0\n"
  97                 "    srl    %0,28\n"
  98                 : "=d" (ccode)
  99                 : "d" (parameter), "d" (__cpu_logical_map[cpu_addr]),
 100                   "a" (order_code)
 101                 : "cc" , "memory", "1" );
 102         return ccode;
 103 }
 104
 105 /*
 106  * Signal processor with parameter and return status
 107  */
 108 extern __inline__ sigp_ccode
 109 signal_processor_ps(unsigned long *statusptr, __u32 parameter,
 110                     __u16 cpu_addr, sigp_order_code order_code)
 111 {
 112         sigp_ccode ccode;
 113
 114         __asm__ __volatile__(
 115                 "    sr     2,2\n"        /* clear status so it doesn't contain rubbish if not saved. */
 116                 "    lr     3,%2\n"       /* parameter in gpr 3 */
 117                 "    sigp   2,%3,0(%4)\n"
 118                 "    st     2,%1\n"
 119                 "    ipm    %0\n"
 120                 "    srl    %0,28\n"
 121                 : "=d" (ccode), "=m" (*statusptr)
 122                 : "d" (parameter), "d" (__cpu_logical_map[cpu_addr]),
 123                   "a" (order_code)
 124                 : "cc" , "memory", "2" , "3"
 125                 );
 126    return ccode;
 127 }
 128
 129 #endif /* __SIGP__ */
 130
 131