cregit-Linux how code gets into the kernel

Release 4.7 arch/s390/include/asm/timex.h

Directory: arch/s390/include/asm
/*
 *  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;
}


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martin schwidefskymartin schwidefsky1894.74%266.67%


heiko carstensheiko carstens15.26%133.33%


Total19100.00%3100.00%






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;
}


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martin schwidefskymartin schwidefsky1995.00%266.67%


heiko carstensheiko carstens15.00%133.33%


Total20100.00%3100.00%






static inline void set_clock_comparator(__u64 time)
{
	asm volatile("sckc %0" : : "Q" (time));
}


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martin schwidefskymartin schwidefsky13100.00%2100.00%


Total13100.00%2100.00%






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


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martin schwidefskymartin schwidefsky14100.00%2100.00%


Total14100.00%2100.00%



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;
}


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heiko carstensheiko carstens39100.00%2100.00%


Total39100.00%2100.00%






static inline void local_tick_enable(unsigned long long comp)
{
	S390_lowcore.clock_comparator = comp;
	set_clock_comparator(S390_lowcore.clock_comparator);
}


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Total25100.00%2100.00%




#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");
}


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martin schwidefskymartin schwidefsky1246.15%125.00%


michael holzheumichael holzheu1142.31%125.00%


chen gangchen gang27.69%125.00%


heiko carstensheiko carstens13.85%125.00%


Total26100.00%4100.00%






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]);
}


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jan glauberjan glauber3282.05%233.33%


michael holzheumichael holzheu410.26%116.67%


chen gangchen gang12.56%116.67%


heiko carstensheiko carstens12.56%116.67%


martin schwidefskymartin schwidefsky12.56%116.67%


Total39100.00%6100.00%






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
}


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martin schwidefskymartin schwidefsky33100.00%1100.00%


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


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martin schwidefskymartin schwidefsky1794.44%150.00%


heiko carstensheiko carstens15.56%150.00%


Total18100.00%2100.00%



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);
}


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christof schmittchristof schmitt2492.31%150.00%


pang xunleipang xunlei27.69%150.00%


Total26100.00%2100.00%



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;
}


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heiko carstensheiko carstens1694.12%266.67%


martin schwidefskymartin schwidefsky15.88%133.33%


Total17100.00%3100.00%



/**
 * 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;
}


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#endif

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heiko carstensheiko carstens16137.97%836.36%


martin schwidefskymartin schwidefsky14935.14%731.82%


christof schmittchristof schmitt337.78%14.55%


jan glauberjan glauber327.55%29.09%


pre-gitpre-git184.25%14.55%


michael holzheumichael holzheu153.54%14.55%


chen gangchen gang81.89%14.55%


pang xunleipang xunlei81.89%14.55%


Total424100.00%22100.00%

  
Directory: arch/s390/include/asm



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