1 /*
2 * Copyright IBM Corp. 2004
3 *
4 * Author: Martin Schwidefsky <schwidefsky@de.ibm.com>
5 */
6
7 #ifndef _S390_CPUTIME_H
8 #define _S390_CPUTIME_H
9
10 #include <linux/types.h>
11 #include <asm/div64.h>
12
13
14 /* We want to use full resolution of the CPU timer: 2**-12 micro-seconds. */
15
16 typedef unsigned long long __nocast cputime_t;
17 typedef unsigned long long __nocast cputime64_t;
18
19 #define cmpxchg_cputime(ptr, old, new) cmpxchg64(ptr, old, new)
20
__div(unsigned long long n,unsigned long base)21 static inline unsigned long __div(unsigned long long n, unsigned long base)
22 {
23 #ifndef CONFIG_64BIT
24 register_pair rp;
25
26 rp.pair = n >> 1;
27 asm ("dr %0,%1" : "+d" (rp) : "d" (base >> 1));
28 return rp.subreg.odd;
29 #else /* CONFIG_64BIT */
30 return n / base;
31 #endif /* CONFIG_64BIT */
32 }
33
34 #define cputime_one_jiffy jiffies_to_cputime(1)
35
36 /*
37 * Convert cputime to jiffies and back.
38 */
cputime_to_jiffies(const cputime_t cputime)39 static inline unsigned long cputime_to_jiffies(const cputime_t cputime)
40 {
41 return __div((__force unsigned long long) cputime, 4096000000ULL / HZ);
42 }
43
jiffies_to_cputime(const unsigned int jif)44 static inline cputime_t jiffies_to_cputime(const unsigned int jif)
45 {
46 return (__force cputime_t)(jif * (4096000000ULL / HZ));
47 }
48
cputime64_to_jiffies64(cputime64_t cputime)49 static inline u64 cputime64_to_jiffies64(cputime64_t cputime)
50 {
51 unsigned long long jif = (__force unsigned long long) cputime;
52 do_div(jif, 4096000000ULL / HZ);
53 return jif;
54 }
55
jiffies64_to_cputime64(const u64 jif)56 static inline cputime64_t jiffies64_to_cputime64(const u64 jif)
57 {
58 return (__force cputime64_t)(jif * (4096000000ULL / HZ));
59 }
60
61 /*
62 * Convert cputime to microseconds and back.
63 */
cputime_to_usecs(const cputime_t cputime)64 static inline unsigned int cputime_to_usecs(const cputime_t cputime)
65 {
66 return (__force unsigned long long) cputime >> 12;
67 }
68
usecs_to_cputime(const unsigned int m)69 static inline cputime_t usecs_to_cputime(const unsigned int m)
70 {
71 return (__force cputime_t)(m * 4096ULL);
72 }
73
74 #define usecs_to_cputime64(m) usecs_to_cputime(m)
75
76 /*
77 * Convert cputime to milliseconds and back.
78 */
cputime_to_secs(const cputime_t cputime)79 static inline unsigned int cputime_to_secs(const cputime_t cputime)
80 {
81 return __div((__force unsigned long long) cputime, 2048000000) >> 1;
82 }
83
secs_to_cputime(const unsigned int s)84 static inline cputime_t secs_to_cputime(const unsigned int s)
85 {
86 return (__force cputime_t)(s * 4096000000ULL);
87 }
88
89 /*
90 * Convert cputime to timespec and back.
91 */
timespec_to_cputime(const struct timespec * value)92 static inline cputime_t timespec_to_cputime(const struct timespec *value)
93 {
94 unsigned long long ret = value->tv_sec * 4096000000ULL;
95 return (__force cputime_t)(ret + value->tv_nsec * 4096 / 1000);
96 }
97
cputime_to_timespec(const cputime_t cputime,struct timespec * value)98 static inline void cputime_to_timespec(const cputime_t cputime,
99 struct timespec *value)
100 {
101 unsigned long long __cputime = (__force unsigned long long) cputime;
102 #ifndef CONFIG_64BIT
103 register_pair rp;
104
105 rp.pair = __cputime >> 1;
106 asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
107 value->tv_nsec = rp.subreg.even * 1000 / 4096;
108 value->tv_sec = rp.subreg.odd;
109 #else
110 value->tv_nsec = (__cputime % 4096000000ULL) * 1000 / 4096;
111 value->tv_sec = __cputime / 4096000000ULL;
112 #endif
113 }
114
115 /*
116 * Convert cputime to timeval and back.
117 * Since cputime and timeval have the same resolution (microseconds)
118 * this is easy.
119 */
timeval_to_cputime(const struct timeval * value)120 static inline cputime_t timeval_to_cputime(const struct timeval *value)
121 {
122 unsigned long long ret = value->tv_sec * 4096000000ULL;
123 return (__force cputime_t)(ret + value->tv_usec * 4096ULL);
124 }
125
cputime_to_timeval(const cputime_t cputime,struct timeval * value)126 static inline void cputime_to_timeval(const cputime_t cputime,
127 struct timeval *value)
128 {
129 unsigned long long __cputime = (__force unsigned long long) cputime;
130 #ifndef CONFIG_64BIT
131 register_pair rp;
132
133 rp.pair = __cputime >> 1;
134 asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
135 value->tv_usec = rp.subreg.even / 4096;
136 value->tv_sec = rp.subreg.odd;
137 #else
138 value->tv_usec = (__cputime % 4096000000ULL) / 4096;
139 value->tv_sec = __cputime / 4096000000ULL;
140 #endif
141 }
142
143 /*
144 * Convert cputime to clock and back.
145 */
cputime_to_clock_t(cputime_t cputime)146 static inline clock_t cputime_to_clock_t(cputime_t cputime)
147 {
148 unsigned long long clock = (__force unsigned long long) cputime;
149 do_div(clock, 4096000000ULL / USER_HZ);
150 return clock;
151 }
152
clock_t_to_cputime(unsigned long x)153 static inline cputime_t clock_t_to_cputime(unsigned long x)
154 {
155 return (__force cputime_t)(x * (4096000000ULL / USER_HZ));
156 }
157
158 /*
159 * Convert cputime64 to clock.
160 */
cputime64_to_clock_t(cputime64_t cputime)161 static inline clock_t cputime64_to_clock_t(cputime64_t cputime)
162 {
163 unsigned long long clock = (__force unsigned long long) cputime;
164 do_div(clock, 4096000000ULL / USER_HZ);
165 return clock;
166 }
167
168 cputime64_t arch_cpu_idle_time(int cpu);
169
170 #define arch_idle_time(cpu) arch_cpu_idle_time(cpu)
171
172 #endif /* _S390_CPUTIME_H */
173