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https://github.com/torvalds/linux
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cfa1e7e1d4
In ESA mode STCKF is not defined even if the facility bit is enabled. To prevent an illegal operation we must also check if we run a 64 bit kernel. To make the check perform well add the STCKF bit to the machine flags. Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
141 lines
2.9 KiB
C
141 lines
2.9 KiB
C
/*
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* include/asm-s390/timex.h
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*
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* S390 version
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* Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
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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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asm volatile("stck %0" : "=Q" (clk) : : "cc");
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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_fast(void)
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{
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unsigned long long clk;
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if (MACHINE_HAS_STCKF)
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asm volatile(".insn s,0xb27c0000,%0" : "=Q" (clk) : : "cc");
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else
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clk = get_clock();
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return clk;
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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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