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timex.h

/*
 *  include/asm-s390/timex.h
 *
 *  S390 version
 *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
 *
 *  Derived from "include/asm-i386/timex.h"
 *    Copyright (C) 1992, Linus Torvalds
 */

#ifndef _ASM_S390_TIMEX_H
#define _ASM_S390_TIMEX_H

/* Inline functions for clock register access. */
static inline int set_clock(__u64 time)
{
      int cc;

      asm volatile(
            "   sck   0(%2)\n"
            "   ipm   %0\n"
            "   srl   %0,28\n"
            : "=d" (cc) : "m" (time), "a" (&time) : "cc");
      return cc;
}

static inline int store_clock(__u64 *time)
{
      int cc;

      asm volatile(
            "   stck  0(%2)\n"
            "   ipm   %0\n"
            "   srl   %0,28\n"
            : "=d" (cc), "=m" (*time) : "a" (time) : "cc");
      return cc;
}

static inline void set_clock_comparator(__u64 time)
{
      asm volatile("sckc 0(%1)" : : "m" (time), "a" (&time));
}

static inline void store_clock_comparator(__u64 *time)
{
      asm volatile("stckc 0(%1)" : "=m" (*time) : "a" (time));
}

#define CLOCK_TICK_RATE 1193180 /* Underlying HZ */

typedef unsigned long long cycles_t;

static inline unsigned long long get_clock (void)
{
      unsigned long long clk;

#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
      asm volatile("stck %0" : "=Q" (clk) : : "cc");
#else /* __GNUC__ */
      asm volatile("stck 0(%1)" : "=m" (clk) : "a" (&clk) : "cc");
#endif /* __GNUC__ */
      return clk;
}

static inline unsigned long long get_clock_xt(void)
{
      unsigned char clk[16];

#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
      asm volatile("stcke %0" : "=Q" (clk) : : "cc");
#else /* __GNUC__ */
      asm volatile("stcke 0(%1)" : "=m" (clk)
                           : "a" (clk) : "cc");
#endif /* __GNUC__ */

      return *((unsigned long long *)&clk[1]);
}

static inline cycles_t get_cycles(void)
{
      return (cycles_t) get_clock() >> 2;
}

int get_sync_clock(unsigned long long *clock);
void init_cpu_timer(void);
unsigned long long monotonic_clock(void);

#endif

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