165 lines
3.8 KiB
C
165 lines
3.8 KiB
C
/*
|
|
* S390 version
|
|
* Copyright IBM Corp. 1999
|
|
*
|
|
* 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>
|
|
#include <linux/time64.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_tod_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_tod_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 */
|
|
#define STORE_CLOCK_EXT_SIZE 16 /* stcke writes 16 bytes */
|
|
|
|
typedef unsigned long long cycles_t;
|
|
|
|
static inline void get_tod_clock_ext(char *clk)
|
|
{
|
|
typedef struct { char _[STORE_CLOCK_EXT_SIZE]; } addrtype;
|
|
|
|
asm volatile("stcke %0" : "=Q" (*(addrtype *) clk) : : "cc");
|
|
}
|
|
|
|
static inline unsigned long long get_tod_clock(void)
|
|
{
|
|
unsigned char clk[STORE_CLOCK_EXT_SIZE];
|
|
|
|
get_tod_clock_ext(clk);
|
|
return *((unsigned long long *)&clk[1]);
|
|
}
|
|
|
|
static inline unsigned long long get_tod_clock_fast(void)
|
|
{
|
|
#ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES
|
|
unsigned long long clk;
|
|
|
|
asm volatile("stckf %0" : "=Q" (clk) : : "cc");
|
|
return clk;
|
|
#else
|
|
return get_tod_clock();
|
|
#endif
|
|
}
|
|
|
|
static inline cycles_t get_cycles(void)
|
|
{
|
|
return (cycles_t) get_tod_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 todval, struct timespec64 *xt);
|
|
|
|
static inline
|
|
void stck_to_timespec64(unsigned long long stck, struct timespec64 *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_tod_clock_monotonic(void)
|
|
{
|
|
return get_tod_clock() - sched_clock_base_cc;
|
|
}
|
|
|
|
/**
|
|
* tod_to_ns - convert a TOD format value to nanoseconds
|
|
* @todval: to be converted TOD format value
|
|
* Returns: number of nanoseconds that correspond to the TOD format value
|
|
*
|
|
* Converting a 64 Bit TOD format value to nanoseconds means that the value
|
|
* must be divided by 4.096. In order to achieve that we multiply with 125
|
|
* and divide by 512:
|
|
*
|
|
* ns = (todval * 125) >> 9;
|
|
*
|
|
* In order to avoid an overflow with the multiplication we can rewrite this.
|
|
* With a split todval == 2^32 * th + tl (th upper 32 bits, tl lower 32 bits)
|
|
* we end up with
|
|
*
|
|
* ns = ((2^32 * th + tl) * 125 ) >> 9;
|
|
* -> ns = (2^23 * th * 125) + ((tl * 125) >> 9);
|
|
*
|
|
*/
|
|
static inline unsigned long long tod_to_ns(unsigned long long todval)
|
|
{
|
|
unsigned long long ns;
|
|
|
|
ns = ((todval >> 32) << 23) * 125;
|
|
ns += ((todval & 0xffffffff) * 125) >> 9;
|
|
return ns;
|
|
}
|
|
|
|
#endif
|