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
/*
|
|
* 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
|
|
|
|
#include <asm/lowcore.h>
|
|
|
|
/* The value of the TOD clock for 1.1.1970. */
|
|
#define TOD_UNIX_EPOCH 0x7d91048bca000000ULL
|
|
|
|
/* Inline functions for clock register access. */
|
|
static inline int set_clock(__u64 time)
|
|
{
|
|
int cc;
|
|
|
|
asm volatile(
|
|
" sck %1\n"
|
|
" ipm %0\n"
|
|
" srl %0,28\n"
|
|
: "=d" (cc) : "Q" (time) : "cc");
|
|
return cc;
|
|
}
|
|
|
|
static inline int store_clock(__u64 *time)
|
|
{
|
|
int cc;
|
|
|
|
asm volatile(
|
|
" stck %1\n"
|
|
" ipm %0\n"
|
|
" srl %0,28\n"
|
|
: "=d" (cc), "=Q" (*time) : : "cc");
|
|
return cc;
|
|
}
|
|
|
|
static inline void set_clock_comparator(__u64 time)
|
|
{
|
|
asm volatile("sckc %0" : : "Q" (time));
|
|
}
|
|
|
|
static inline void store_clock_comparator(__u64 *time)
|
|
{
|
|
asm volatile("stckc %0" : "=Q" (*time));
|
|
}
|
|
|
|
void clock_comparator_work(void);
|
|
|
|
static inline unsigned long long local_tick_disable(void)
|
|
{
|
|
unsigned long long old;
|
|
|
|
old = S390_lowcore.clock_comparator;
|
|
S390_lowcore.clock_comparator = -1ULL;
|
|
set_clock_comparator(S390_lowcore.clock_comparator);
|
|
return old;
|
|
}
|
|
|
|
static inline void local_tick_enable(unsigned long long comp)
|
|
{
|
|
S390_lowcore.clock_comparator = comp;
|
|
set_clock_comparator(S390_lowcore.clock_comparator);
|
|
}
|
|
|
|
#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;
|
|
|
|
asm volatile("stck %0" : "=Q" (clk) : : "cc");
|
|
return clk;
|
|
}
|
|
|
|
static inline void get_clock_ext(char *clk)
|
|
{
|
|
asm volatile("stcke %0" : "=Q" (*clk) : : "cc");
|
|
}
|
|
|
|
static inline unsigned long long get_clock_fast(void)
|
|
{
|
|
unsigned long long clk;
|
|
|
|
if (MACHINE_HAS_STCKF)
|
|
asm volatile(".insn s,0xb27c0000,%0" : "=Q" (clk) : : "cc");
|
|
else
|
|
clk = get_clock();
|
|
return clk;
|
|
}
|
|
|
|
static inline unsigned long long get_clock_xt(void)
|
|
{
|
|
unsigned char clk[16];
|
|
get_clock_ext(clk);
|
|
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);
|
|
|
|
void tod_to_timeval(__u64, struct timespec *);
|
|
|
|
static inline
|
|
void stck_to_timespec(unsigned long long stck, struct timespec *ts)
|
|
{
|
|
tod_to_timeval(stck - TOD_UNIX_EPOCH, ts);
|
|
}
|
|
|
|
extern u64 sched_clock_base_cc;
|
|
|
|
/**
|
|
* get_clock_monotonic - returns current time in clock rate units
|
|
*
|
|
* The caller must ensure that preemption is disabled.
|
|
* The clock and sched_clock_base get changed via stop_machine.
|
|
* Therefore preemption must be disabled when calling this
|
|
* function, otherwise the returned value is not guaranteed to
|
|
* be monotonic.
|
|
*/
|
|
static inline unsigned long long get_clock_monotonic(void)
|
|
{
|
|
return get_clock_xt() - sched_clock_base_cc;
|
|
}
|
|
|
|
#endif
|