/* 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 #include #include /* 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)); } 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); 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