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Linux/arch/s390/include/asm/timex.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  *  S390 version
  4  *    Copyright IBM Corp. 1999
  5  *
  6  *  Derived from "include/asm-i386/timex.h"
  7  *    Copyright (C) 1992, Linus Torvalds
  8  */
  9 
 10 #ifndef _ASM_S390_TIMEX_H
 11 #define _ASM_S390_TIMEX_H
 12 
 13 #include <asm/lowcore.h>
 14 #include <linux/time64.h>
 15 
 16 /* The value of the TOD clock for 1.1.1970. */
 17 #define TOD_UNIX_EPOCH 0x7d91048bca000000ULL
 18 
 19 extern u64 clock_comparator_max;
 20 
 21 /* Inline functions for clock register access. */
 22 static inline int set_tod_clock(__u64 time)
 23 {
 24         int cc;
 25 
 26         asm volatile(
 27                 "   sck   %1\n"
 28                 "   ipm   %0\n"
 29                 "   srl   %0,28\n"
 30                 : "=d" (cc) : "Q" (time) : "cc");
 31         return cc;
 32 }
 33 
 34 static inline int store_tod_clock(__u64 *time)
 35 {
 36         int cc;
 37 
 38         asm volatile(
 39                 "   stck  %1\n"
 40                 "   ipm   %0\n"
 41                 "   srl   %0,28\n"
 42                 : "=d" (cc), "=Q" (*time) : : "cc");
 43         return cc;
 44 }
 45 
 46 static inline void set_clock_comparator(__u64 time)
 47 {
 48         asm volatile("sckc %0" : : "Q" (time));
 49 }
 50 
 51 static inline void store_clock_comparator(__u64 *time)
 52 {
 53         asm volatile("stckc %0" : "=Q" (*time));
 54 }
 55 
 56 void clock_comparator_work(void);
 57 
 58 void __init time_early_init(void);
 59 
 60 extern unsigned char ptff_function_mask[16];
 61 
 62 /* Function codes for the ptff instruction. */
 63 #define PTFF_QAF        0x00    /* query available functions */
 64 #define PTFF_QTO        0x01    /* query tod offset */
 65 #define PTFF_QSI        0x02    /* query steering information */
 66 #define PTFF_QUI        0x04    /* query UTC information */
 67 #define PTFF_ATO        0x40    /* adjust tod offset */
 68 #define PTFF_STO        0x41    /* set tod offset */
 69 #define PTFF_SFS        0x42    /* set fine steering rate */
 70 #define PTFF_SGS        0x43    /* set gross steering rate */
 71 
 72 /* Query TOD offset result */
 73 struct ptff_qto {
 74         unsigned long long physical_clock;
 75         unsigned long long tod_offset;
 76         unsigned long long logical_tod_offset;
 77         unsigned long long tod_epoch_difference;
 78 } __packed;
 79 
 80 static inline int ptff_query(unsigned int nr)
 81 {
 82         unsigned char *ptr;
 83 
 84         ptr = ptff_function_mask + (nr >> 3);
 85         return (*ptr & (0x80 >> (nr & 7))) != 0;
 86 }
 87 
 88 /* Query UTC information result */
 89 struct ptff_qui {
 90         unsigned int tm : 2;
 91         unsigned int ts : 2;
 92         unsigned int : 28;
 93         unsigned int pad_0x04;
 94         unsigned long leap_event;
 95         short old_leap;
 96         short new_leap;
 97         unsigned int pad_0x14;
 98         unsigned long prt[5];
 99         unsigned long cst[3];
100         unsigned int skew;
101         unsigned int pad_0x5c[41];
102 } __packed;
103 
104 /*
105  * ptff - Perform timing facility function
106  * @ptff_block: Pointer to ptff parameter block
107  * @len: Length of parameter block
108  * @func: Function code
109  * Returns: Condition code (0 on success)
110  */
111 #define ptff(ptff_block, len, func)                                     \
112 ({                                                                      \
113         struct addrtype { char _[len]; };                               \
114         register unsigned int reg0 asm("") = func;                     \
115         register unsigned long reg1 asm("1") = (unsigned long) (ptff_block);\
116         int rc;                                                         \
117                                                                         \
118         asm volatile(                                                   \
119                 "       .word   0x0104\n"                               \
120                 "       ipm     %0\n"                                   \
121                 "       srl     %0,28\n"                                \
122                 : "=d" (rc), "+m" (*(struct addrtype *) reg1)           \
123                 : "d" (reg0), "d" (reg1) : "cc");                       \
124         rc;                                                             \
125 })
126 
127 static inline unsigned long long local_tick_disable(void)
128 {
129         unsigned long long old;
130 
131         old = S390_lowcore.clock_comparator;
132         S390_lowcore.clock_comparator = clock_comparator_max;
133         set_clock_comparator(S390_lowcore.clock_comparator);
134         return old;
135 }
136 
137 static inline void local_tick_enable(unsigned long long comp)
138 {
139         S390_lowcore.clock_comparator = comp;
140         set_clock_comparator(S390_lowcore.clock_comparator);
141 }
142 
143 #define CLOCK_TICK_RATE         1193180 /* Underlying HZ */
144 #define STORE_CLOCK_EXT_SIZE    16      /* stcke writes 16 bytes */
145 
146 typedef unsigned long long cycles_t;
147 
148 static inline void get_tod_clock_ext(char *clk)
149 {
150         typedef struct { char _[STORE_CLOCK_EXT_SIZE]; } addrtype;
151 
152         asm volatile("stcke %0" : "=Q" (*(addrtype *) clk) : : "cc");
153 }
154 
155 static inline unsigned long long get_tod_clock(void)
156 {
157         unsigned char clk[STORE_CLOCK_EXT_SIZE];
158 
159         get_tod_clock_ext(clk);
160         return *((unsigned long long *)&clk[1]);
161 }
162 
163 static inline unsigned long long get_tod_clock_fast(void)
164 {
165 #ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES
166         unsigned long long clk;
167 
168         asm volatile("stckf %0" : "=Q" (clk) : : "cc");
169         return clk;
170 #else
171         return get_tod_clock();
172 #endif
173 }
174 
175 static inline cycles_t get_cycles(void)
176 {
177         return (cycles_t) get_tod_clock() >> 2;
178 }
179 
180 int get_phys_clock(unsigned long *clock);
181 void init_cpu_timer(void);
182 unsigned long long monotonic_clock(void);
183 
184 extern unsigned char tod_clock_base[16] __aligned(8);
185 
186 /**
187  * get_clock_monotonic - returns current time in clock rate units
188  *
189  * The caller must ensure that preemption is disabled.
190  * The clock and tod_clock_base get changed via stop_machine.
191  * Therefore preemption must be disabled when calling this
192  * function, otherwise the returned value is not guaranteed to
193  * be monotonic.
194  */
195 static inline unsigned long long get_tod_clock_monotonic(void)
196 {
197         return get_tod_clock() - *(unsigned long long *) &tod_clock_base[1];
198 }
199 
200 /**
201  * tod_to_ns - convert a TOD format value to nanoseconds
202  * @todval: to be converted TOD format value
203  * Returns: number of nanoseconds that correspond to the TOD format value
204  *
205  * Converting a 64 Bit TOD format value to nanoseconds means that the value
206  * must be divided by 4.096. In order to achieve that we multiply with 125
207  * and divide by 512:
208  *
209  *    ns = (todval * 125) >> 9;
210  *
211  * In order to avoid an overflow with the multiplication we can rewrite this.
212  * With a split todval == 2^9 * th + tl (th upper 55 bits, tl lower 9 bits)
213  * we end up with
214  *
215  *    ns = ((2^9 * th + tl) * 125 ) >> 9;
216  * -> ns = (th * 125) + ((tl * 125) >> 9);
217  *
218  */
219 static inline unsigned long long tod_to_ns(unsigned long long todval)
220 {
221         return ((todval >> 9) * 125) + (((todval & 0x1ff) * 125) >> 9);
222 }
223 
224 /**
225  * tod_after - compare two 64 bit TOD values
226  * @a: first 64 bit TOD timestamp
227  * @b: second 64 bit TOD timestamp
228  *
229  * Returns: true if a is later than b
230  */
231 static inline int tod_after(unsigned long long a, unsigned long long b)
232 {
233         if (MACHINE_HAS_SCC)
234                 return (long long) a > (long long) b;
235         return a > b;
236 }
237 
238 /**
239  * tod_after_eq - compare two 64 bit TOD values
240  * @a: first 64 bit TOD timestamp
241  * @b: second 64 bit TOD timestamp
242  *
243  * Returns: true if a is later than b
244  */
245 static inline int tod_after_eq(unsigned long long a, unsigned long long b)
246 {
247         if (MACHINE_HAS_SCC)
248                 return (long long) a >= (long long) b;
249         return a >= b;
250 }
251 
252 #endif
253 

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