a53c8fab3f
Remove the file name from the comment at top of many files. In most cases the file name was wrong anyway, so it's rather pointless. Also unify the IBM copyright statement. We did have a lot of sightly different statements and wanted to change them one after another whenever a file gets touched. However that never happened. Instead people start to take the old/"wrong" statements to use as a template for new files. So unify all of them in one go. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
132 lines
2.7 KiB
C
132 lines
2.7 KiB
C
/*
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* S390 version
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* Copyright IBM Corp. 1999
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*
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* Derived from "include/asm-i386/timex.h"
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* Copyright (C) 1992, Linus Torvalds
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*/
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#ifndef _ASM_S390_TIMEX_H
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#define _ASM_S390_TIMEX_H
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#include <asm/lowcore.h>
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/* The value of the TOD clock for 1.1.1970. */
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#define TOD_UNIX_EPOCH 0x7d91048bca000000ULL
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/* Inline functions for clock register access. */
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static inline int set_clock(__u64 time)
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{
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int cc;
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asm volatile(
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" sck %1\n"
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" ipm %0\n"
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" srl %0,28\n"
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: "=d" (cc) : "Q" (time) : "cc");
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return cc;
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}
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static inline int store_clock(__u64 *time)
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{
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int cc;
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asm volatile(
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" stck %1\n"
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" ipm %0\n"
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" srl %0,28\n"
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: "=d" (cc), "=Q" (*time) : : "cc");
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return cc;
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}
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static inline void set_clock_comparator(__u64 time)
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{
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asm volatile("sckc %0" : : "Q" (time));
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}
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static inline void store_clock_comparator(__u64 *time)
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{
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asm volatile("stckc %0" : "=Q" (*time));
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}
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void clock_comparator_work(void);
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static inline unsigned long long local_tick_disable(void)
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{
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unsigned long long old;
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old = S390_lowcore.clock_comparator;
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S390_lowcore.clock_comparator = -1ULL;
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set_clock_comparator(S390_lowcore.clock_comparator);
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return old;
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}
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static inline void local_tick_enable(unsigned long long comp)
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{
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S390_lowcore.clock_comparator = comp;
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set_clock_comparator(S390_lowcore.clock_comparator);
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}
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#define CLOCK_TICK_RATE 1193180 /* Underlying HZ */
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typedef unsigned long long cycles_t;
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static inline unsigned long long get_clock(void)
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{
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unsigned long long clk;
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#ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES
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asm volatile(".insn s,0xb27c0000,%0" : "=Q" (clk) : : "cc");
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#else
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asm volatile("stck %0" : "=Q" (clk) : : "cc");
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#endif
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return clk;
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}
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static inline void get_clock_ext(char *clk)
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{
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asm volatile("stcke %0" : "=Q" (*clk) : : "cc");
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}
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static inline unsigned long long get_clock_xt(void)
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{
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unsigned char clk[16];
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get_clock_ext(clk);
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return *((unsigned long long *)&clk[1]);
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}
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static inline cycles_t get_cycles(void)
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{
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return (cycles_t) get_clock() >> 2;
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}
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int get_sync_clock(unsigned long long *clock);
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void init_cpu_timer(void);
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unsigned long long monotonic_clock(void);
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void tod_to_timeval(__u64, struct timespec *);
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static inline
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void stck_to_timespec(unsigned long long stck, struct timespec *ts)
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{
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tod_to_timeval(stck - TOD_UNIX_EPOCH, ts);
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}
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extern u64 sched_clock_base_cc;
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/**
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* get_clock_monotonic - returns current time in clock rate units
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*
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* The caller must ensure that preemption is disabled.
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* The clock and sched_clock_base get changed via stop_machine.
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* Therefore preemption must be disabled when calling this
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* function, otherwise the returned value is not guaranteed to
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* be monotonic.
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*/
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static inline unsigned long long get_clock_monotonic(void)
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{
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return get_clock_xt() - sched_clock_base_cc;
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}
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#endif
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