arch/s390/include/asm/timex.h - third_party/linux - Git at Google

 /* SPDX-License-Identifier: GPL-2.0 */
 /*
  *  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 <linux/preempt.h>
 #include <linux/time64.h>
 #include <asm/lowcore.h>

 /* The value of the TOD clock for 1.1.1970. */
 #define TOD_UNIX_EPOCH 0x7d91048bca000000ULL

 extern u64 clock_comparator_max;

 /* 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);

 void __init time_early_init(void);

 extern unsigned char ptff_function_mask[16];

 /* Function codes for the ptff instruction. */
 #define PTFF_QAF	0x00	/* query available functions */
 #define PTFF_QTO	0x01	/* query tod offset */
 #define PTFF_QSI	0x02	/* query steering information */
 #define PTFF_QUI	0x04	/* query UTC information */
 #define PTFF_ATO	0x40	/* adjust tod offset */
 #define PTFF_STO	0x41	/* set tod offset */
 #define PTFF_SFS	0x42	/* set fine steering rate */
 #define PTFF_SGS	0x43	/* set gross steering rate */

 /* Query TOD offset result */
 struct ptff_qto {
 	unsigned long long physical_clock;
 	unsigned long long tod_offset;
 	unsigned long long logical_tod_offset;
 	unsigned long long tod_epoch_difference;
 } __packed;

 static inline int ptff_query(unsigned int nr)
 {
 	unsigned char *ptr;

 	ptr = ptff_function_mask + (nr >> 3);
 	return (*ptr & (0x80 >> (nr & 7))) != 0;
 }

 /* Query UTC information result */
 struct ptff_qui {
 	unsigned int tm : 2;
 	unsigned int ts : 2;
 	unsigned int : 28;
 	unsigned int pad_0x04;
 	unsigned long leap_event;
 	short old_leap;
 	short new_leap;
 	unsigned int pad_0x14;
 	unsigned long prt[5];
 	unsigned long cst[3];
 	unsigned int skew;
 	unsigned int pad_0x5c[41];
 } __packed;

 /*
  * ptff - Perform timing facility function
  * @ptff_block: Pointer to ptff parameter block
  * @len: Length of parameter block
  * @func: Function code
  * Returns: Condition code (0 on success)
  */
 #define ptff(ptff_block, len, func)					\
 ({									\
 	struct addrtype { char _[len]; };				\
 	register unsigned int reg0 asm("0") = func;			\
 	register unsigned long reg1 asm("1") = (unsigned long) (ptff_block);\
 	int rc;								\
 									\
 	asm volatile(							\
 		"	.word	0x0104\n"				\
 		"	ipm	%0\n"					\
 		"	srl	%0,28\n"				\
 		: "=d" (rc), "+m" (*(struct addrtype *) reg1)		\
 		: "d" (reg0), "d" (reg1) : "cc");			\
 	rc;								\
 })

 static inline unsigned long long local_tick_disable(void)
 {
 	unsigned long long old;

 	old = S390_lowcore.clock_comparator;
 	S390_lowcore.clock_comparator = clock_comparator_max;
 	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)
 {
 	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;
 }
 #define get_cycles get_cycles

 int get_phys_clock(unsigned long *clock);
 void init_cpu_timer(void);
 unsigned long long monotonic_clock(void);

 extern unsigned char tod_clock_base[16] __aligned(8);

 /**
  * get_clock_monotonic - returns current time in clock rate units
  *
  * The clock and tod_clock_base get changed via stop_machine.
  * Therefore preemption must be disabled, otherwise the returned
  * value is not guaranteed to be monotonic.
  */
 static inline unsigned long long get_tod_clock_monotonic(void)
 {
 	unsigned long long tod;

 	preempt_disable_notrace();
 	tod = get_tod_clock() - *(unsigned long long *) &tod_clock_base[1];
 	preempt_enable_notrace();
 	return tod;
 }

 /**
  * 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 == 2^9 * th + tl (th upper 55 bits, tl lower 9 bits)
  * we end up with
  *
  *    ns = ((2^9 * th + tl) * 125 ) >> 9;
  * -> ns = (th * 125) + ((tl * 125) >> 9);
  *
  */
 static inline unsigned long long tod_to_ns(unsigned long long todval)
 {
 	return ((todval >> 9) * 125) + (((todval & 0x1ff) * 125) >> 9);
 }

 /**
  * tod_after - compare two 64 bit TOD values
  * @a: first 64 bit TOD timestamp
  * @b: second 64 bit TOD timestamp
  *
  * Returns: true if a is later than b
  */
 static inline int tod_after(unsigned long long a, unsigned long long b)
 {
 	if (MACHINE_HAS_SCC)
 		return (long long) a > (long long) b;
 	return a > b;
 }

 /**
  * tod_after_eq - compare two 64 bit TOD values
  * @a: first 64 bit TOD timestamp
  * @b: second 64 bit TOD timestamp
  *
  * Returns: true if a is later than b
  */
 static inline int tod_after_eq(unsigned long long a, unsigned long long b)
 {
 	if (MACHINE_HAS_SCC)
 		return (long long) a >= (long long) b;
 	return a >= b;
 }

 #endif
	/* SPDX-License-Identifier: GPL-2.0 */
	/*
	* 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 <linux/preempt.h>
	#include <linux/time64.h>
	#include <asm/lowcore.h>

	/* The value of the TOD clock for 1.1.1970. */
	#define TOD_UNIX_EPOCH 0x7d91048bca000000ULL

	extern u64 clock_comparator_max;

	/* 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);

	void __init time_early_init(void);

	extern unsigned char ptff_function_mask[16];

	/* Function codes for the ptff instruction. */
	#define PTFF_QAF 0x00 /* query available functions */
	#define PTFF_QTO 0x01 /* query tod offset */
	#define PTFF_QSI 0x02 /* query steering information */
	#define PTFF_QUI 0x04 /* query UTC information */
	#define PTFF_ATO 0x40 /* adjust tod offset */
	#define PTFF_STO 0x41 /* set tod offset */
	#define PTFF_SFS 0x42 /* set fine steering rate */
	#define PTFF_SGS 0x43 /* set gross steering rate */

	/* Query TOD offset result */
	struct ptff_qto {
	unsigned long long physical_clock;
	unsigned long long tod_offset;
	unsigned long long logical_tod_offset;
	unsigned long long tod_epoch_difference;
	} __packed;

	static inline int ptff_query(unsigned int nr)
	{
	unsigned char *ptr;

	ptr = ptff_function_mask + (nr >> 3);
	return (*ptr & (0x80 >> (nr & 7))) != 0;
	}

	/* Query UTC information result */
	struct ptff_qui {
	unsigned int tm : 2;
	unsigned int ts : 2;
	unsigned int : 28;
	unsigned int pad_0x04;
	unsigned long leap_event;
	short old_leap;
	short new_leap;
	unsigned int pad_0x14;
	unsigned long prt[5];
	unsigned long cst[3];
	unsigned int skew;
	unsigned int pad_0x5c[41];
	} __packed;

	/*
	* ptff - Perform timing facility function
	* @ptff_block: Pointer to ptff parameter block
	* @len: Length of parameter block
	* @func: Function code
	* Returns: Condition code (0 on success)
	*/
	#define ptff(ptff_block, len, func) \
	({ \
	struct addrtype { char _[len]; }; \
	register unsigned int reg0 asm("0") = func; \
	register unsigned long reg1 asm("1") = (unsigned long) (ptff_block);\
	int rc; \
	\
	asm volatile( \
	" .word 0x0104\n" \
	" ipm %0\n" \
	" srl %0,28\n" \
	: "=d" (rc), "+m" ((struct addrtype ) reg1) \
	: "d" (reg0), "d" (reg1) : "cc"); \
	rc; \
	})

	static inline unsigned long long local_tick_disable(void)
	{
	unsigned long long old;

	old = S390_lowcore.clock_comparator;
	S390_lowcore.clock_comparator = clock_comparator_max;
	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)
	{
	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;
	}
	#define get_cycles get_cycles

	int get_phys_clock(unsigned long *clock);
	void init_cpu_timer(void);
	unsigned long long monotonic_clock(void);

	extern unsigned char tod_clock_base[16] __aligned(8);

	/**
	* get_clock_monotonic - returns current time in clock rate units
	*
	* The clock and tod_clock_base get changed via stop_machine.
	* Therefore preemption must be disabled, otherwise the returned
	* value is not guaranteed to be monotonic.
	*/
	static inline unsigned long long get_tod_clock_monotonic(void)
	{
	unsigned long long tod;

	preempt_disable_notrace();
	tod = get_tod_clock() - (unsigned long long ) &tod_clock_base[1];
	preempt_enable_notrace();
	return tod;
	}

	/**
	* 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 == 2^9 * th + tl (th upper 55 bits, tl lower 9 bits)
	* we end up with
	*
	* ns = ((2^9 * th + tl) * 125 ) >> 9;
	* -> ns = (th * 125) + ((tl * 125) >> 9);
	*
	*/
	static inline unsigned long long tod_to_ns(unsigned long long todval)
	{
	return ((todval >> 9) * 125) + (((todval & 0x1ff) * 125) >> 9);
	}

	/**
	* tod_after - compare two 64 bit TOD values
	* @a: first 64 bit TOD timestamp
	* @b: second 64 bit TOD timestamp
	*
	* Returns: true if a is later than b
	*/
	static inline int tod_after(unsigned long long a, unsigned long long b)
	{
	if (MACHINE_HAS_SCC)
	return (long long) a > (long long) b;
	return a > b;
	}

	/**
	* tod_after_eq - compare two 64 bit TOD values
	* @a: first 64 bit TOD timestamp
	* @b: second 64 bit TOD timestamp
	*
	* Returns: true if a is later than b
	*/
	static inline int tod_after_eq(unsigned long long a, unsigned long long b)
	{
	if (MACHINE_HAS_SCC)
	return (long long) a >= (long long) b;
	return a >= b;
	}

	#endif