include/asm-s390/smp.h

   1 /*
   2  *  include/asm-s390/smp.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 #ifndef __ASM_SMP_H
  10 #define __ASM_SMP_H
  11 #include <linux/config.h>
  12 #ifdef CONFIG_SMP
  13 #ifndef __ASSEMBLY__
  14
  15 #include <asm/lowcore.h>
  16 #include <linux/tasks.h>    // FOR NR_CPUS definition only.
  17 #include <linux/kernel.h>   // FOR FASTCALL definition
  18
  19 #define smp_processor_id() (current->processor)
  20 #define NO_PROC_ID              0xFF            /* No processor magic marker */
  21
  22 /*
  23  *      This magic constant controls our willingness to transfer
  24  *      a process across CPUs. Such a transfer incurs misses on the L1
  25  *      cache, and on a P6 or P5 with multiple L2 caches L2 hits. My
  26  *      gut feeling is this will vary by board in value. For a board
  27  *      with separate L2 cache it probably depends also on the RSS, and
  28  *      for a board with shared L2 cache it ought to decay fast as other
  29  *      processes are run.
  30  */
  31
  32 #define PROC_CHANGE_PENALTY     20              /* Schedule penalty */
  33
  34 extern unsigned long ipi_count;
  35 extern void count_cpus(void);
  36
  37 extern __inline__ int cpu_logical_map(int cpu)
  38 {
  39         return cpu;
  40 }
  41
  42 extern __inline__ int cpu_number_map(int cpu)
  43 {
  44         return cpu;
  45 }
  46
  47 extern __inline__ __u16 hard_smp_processor_id(void)
  48 {
  49         __u16 cpu_address;
  50
  51         __asm__ ("stap %0\n" : "=m" (cpu_address));
  52         return cpu_address;
  53 }
  54
  55 #define cpu_logical_map(cpu) (cpu)
  56
  57 void smp_local_timer_interrupt(struct pt_regs * regs);
  58
  59 /*
  60   s390 specific smp.c headers
  61  */
  62 typedef struct
  63 {
  64         int        intresting;
  65         sigp_ccode ccode;
  66         __u32      status;
  67         __u16      cpu;
  68 } sigp_info;
  69
  70 sigp_ccode smp_ext_call_sync(int cpu, ec_cmd_sig cmd,void *parms);
  71 sigp_ccode smp_ext_call_async(int cpu, ec_bit_sig sig);
  72 void smp_ext_call_sync_others(ec_cmd_sig cmd, void *parms);
  73 void smp_ext_call_async_others(ec_bit_sig sig);
  74
  75 int smp_signal_others(sigp_order_code order_code,__u32 parameter,
  76                       int spin,sigp_info *info);
  77 #endif
  78 #endif
  79 #endif