include/asm-s390/timex.h

   1 /*
   2  *  include/asm-s390/timex.h
   3  *
   4  *  S390 version
   5  *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6  *
   7  *  Derived from "include/asm-i386/timex.h"
   8  *    Copyright (C) 1992, Linus Torvalds
   9  */
  10
  11 #ifndef _ASM_S390_TIMEX_H
  12 #define _ASM_S390_TIMEX_H
  13
  14 /* Inline functions for clock register access. */
  15 static inline int set_clock(__u64 time)
  16 {
  17         int cc;
  18
  19         asm volatile(
  20                 "   sck   0(%2)\n"
  21                 "   ipm   %0\n"
  22                 "   srl   %0,28\n"
  23                 : "=d" (cc) : "m" (time), "a" (&time) : "cc");
  24         return cc;
  25 }
  26
  27 static inline int store_clock(__u64 *time)
  28 {
  29         int cc;
  30
  31         asm volatile(
  32                 "   stck  0(%2)\n"
  33                 "   ipm   %0\n"
  34                 "   srl   %0,28\n"
  35                 : "=d" (cc), "=m" (*time) : "a" (time) : "cc");
  36         return cc;
  37 }
  38
  39 static inline void set_clock_comparator(__u64 time)
  40 {
  41         asm volatile("sckc 0(%1)" : : "m" (time), "a" (&time));
  42 }
  43
  44 static inline void store_clock_comparator(__u64 *time)
  45 {
  46         asm volatile("stckc 0(%1)" : "=m" (*time) : "a" (time));
  47 }
  48
  49 #define CLOCK_TICK_RATE 1193180 /* Underlying HZ */
  50
  51 typedef unsigned long long cycles_t;
  52
  53 static inline unsigned long long get_clock (void)
  54 {
  55         unsigned long long clk;
  56
  57 #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
  58         asm volatile("stck %0" : "=Q" (clk) : : "cc");
  59 #else /* __GNUC__ */
  60         asm volatile("stck 0(%1)" : "=m" (clk) : "a" (&clk) : "cc");
  61 #endif /* __GNUC__ */
  62         return clk;
  63 }
  64
  65 static inline void get_clock_extended(void *dest)
  66 {
  67         typedef struct { unsigned long long clk[2]; } __clock_t;
  68
  69 #if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
  70         asm volatile("stcke %0" : "=Q" (*((__clock_t *)dest)) : : "cc");
  71 #else /* __GNUC__ */
  72         asm volatile("stcke 0(%1)" : "=m" (*((__clock_t *)dest))
  73                                    : "a" ((__clock_t *)dest) : "cc");
  74 #endif /* __GNUC__ */
  75 }
  76
  77 static inline cycles_t get_cycles(void)
  78 {
  79         return (cycles_t) get_clock() >> 2;
  80 }
  81
  82 int get_sync_clock(unsigned long long *clock);
  83 void init_cpu_timer(void);
  84
  85 #endif