diff options
Diffstat (limited to 'include/linux/timex.h')
-rw-r--r-- | include/linux/timex.h | 73 |
1 files changed, 37 insertions, 36 deletions
diff --git a/include/linux/timex.h b/include/linux/timex.h index 9007313b5b71..998a55d80acf 100644 --- a/include/linux/timex.h +++ b/include/linux/timex.h | |||
@@ -53,47 +53,11 @@ | |||
53 | #ifndef _LINUX_TIMEX_H | 53 | #ifndef _LINUX_TIMEX_H |
54 | #define _LINUX_TIMEX_H | 54 | #define _LINUX_TIMEX_H |
55 | 55 | ||
56 | #include <linux/compiler.h> | ||
57 | #include <linux/time.h> | 56 | #include <linux/time.h> |
58 | 57 | ||
59 | #include <asm/param.h> | ||
60 | |||
61 | #define NTP_API 4 /* NTP API version */ | 58 | #define NTP_API 4 /* NTP API version */ |
62 | 59 | ||
63 | /* | 60 | /* |
64 | * SHIFT_KG and SHIFT_KF establish the damping of the PLL and are chosen | ||
65 | * for a slightly underdamped convergence characteristic. SHIFT_KH | ||
66 | * establishes the damping of the FLL and is chosen by wisdom and black | ||
67 | * art. | ||
68 | * | ||
69 | * MAXTC establishes the maximum time constant of the PLL. With the | ||
70 | * SHIFT_KG and SHIFT_KF values given and a time constant range from | ||
71 | * zero to MAXTC, the PLL will converge in 15 minutes to 16 hours, | ||
72 | * respectively. | ||
73 | */ | ||
74 | #define SHIFT_PLL 4 /* PLL frequency factor (shift) */ | ||
75 | #define SHIFT_FLL 2 /* FLL frequency factor (shift) */ | ||
76 | #define MAXTC 10 /* maximum time constant (shift) */ | ||
77 | |||
78 | /* | ||
79 | * SHIFT_USEC defines the scaling (shift) of the time_freq and | ||
80 | * time_tolerance variables, which represent the current frequency | ||
81 | * offset and maximum frequency tolerance. | ||
82 | */ | ||
83 | #define SHIFT_USEC 16 /* frequency offset scale (shift) */ | ||
84 | #define PPM_SCALE (NSEC_PER_USEC << (NTP_SCALE_SHIFT - SHIFT_USEC)) | ||
85 | #define PPM_SCALE_INV_SHIFT 19 | ||
86 | #define PPM_SCALE_INV ((1ll << (PPM_SCALE_INV_SHIFT + NTP_SCALE_SHIFT)) / \ | ||
87 | PPM_SCALE + 1) | ||
88 | |||
89 | #define MAXPHASE 500000000l /* max phase error (ns) */ | ||
90 | #define MAXFREQ 500000 /* max frequency error (ns/s) */ | ||
91 | #define MAXFREQ_SCALED ((s64)MAXFREQ << NTP_SCALE_SHIFT) | ||
92 | #define MINSEC 256 /* min interval between updates (s) */ | ||
93 | #define MAXSEC 2048 /* max interval between updates (s) */ | ||
94 | #define NTP_PHASE_LIMIT ((MAXPHASE / NSEC_PER_USEC) << 5) /* beyond max. dispersion */ | ||
95 | |||
96 | /* | ||
97 | * syscall interface - used (mainly by NTP daemon) | 61 | * syscall interface - used (mainly by NTP daemon) |
98 | * to discipline kernel clock oscillator | 62 | * to discipline kernel clock oscillator |
99 | */ | 63 | */ |
@@ -199,9 +163,46 @@ struct timex { | |||
199 | #define TIME_BAD TIME_ERROR /* bw compat */ | 163 | #define TIME_BAD TIME_ERROR /* bw compat */ |
200 | 164 | ||
201 | #ifdef __KERNEL__ | 165 | #ifdef __KERNEL__ |
166 | #include <linux/compiler.h> | ||
167 | #include <linux/types.h> | ||
168 | #include <linux/param.h> | ||
169 | |||
202 | #include <asm/timex.h> | 170 | #include <asm/timex.h> |
203 | 171 | ||
204 | /* | 172 | /* |
173 | * SHIFT_KG and SHIFT_KF establish the damping of the PLL and are chosen | ||
174 | * for a slightly underdamped convergence characteristic. SHIFT_KH | ||
175 | * establishes the damping of the FLL and is chosen by wisdom and black | ||
176 | * art. | ||
177 | * | ||
178 | * MAXTC establishes the maximum time constant of the PLL. With the | ||
179 | * SHIFT_KG and SHIFT_KF values given and a time constant range from | ||
180 | * zero to MAXTC, the PLL will converge in 15 minutes to 16 hours, | ||
181 | * respectively. | ||
182 | */ | ||
183 | #define SHIFT_PLL 4 /* PLL frequency factor (shift) */ | ||
184 | #define SHIFT_FLL 2 /* FLL frequency factor (shift) */ | ||
185 | #define MAXTC 10 /* maximum time constant (shift) */ | ||
186 | |||
187 | /* | ||
188 | * SHIFT_USEC defines the scaling (shift) of the time_freq and | ||
189 | * time_tolerance variables, which represent the current frequency | ||
190 | * offset and maximum frequency tolerance. | ||
191 | */ | ||
192 | #define SHIFT_USEC 16 /* frequency offset scale (shift) */ | ||
193 | #define PPM_SCALE (NSEC_PER_USEC << (NTP_SCALE_SHIFT - SHIFT_USEC)) | ||
194 | #define PPM_SCALE_INV_SHIFT 19 | ||
195 | #define PPM_SCALE_INV ((1ll << (PPM_SCALE_INV_SHIFT + NTP_SCALE_SHIFT)) / \ | ||
196 | PPM_SCALE + 1) | ||
197 | |||
198 | #define MAXPHASE 500000000l /* max phase error (ns) */ | ||
199 | #define MAXFREQ 500000 /* max frequency error (ns/s) */ | ||
200 | #define MAXFREQ_SCALED ((s64)MAXFREQ << NTP_SCALE_SHIFT) | ||
201 | #define MINSEC 256 /* min interval between updates (s) */ | ||
202 | #define MAXSEC 2048 /* max interval between updates (s) */ | ||
203 | #define NTP_PHASE_LIMIT ((MAXPHASE / NSEC_PER_USEC) << 5) /* beyond max. dispersion */ | ||
204 | |||
205 | /* | ||
205 | * kernel variables | 206 | * kernel variables |
206 | * Note: maximum error = NTP synch distance = dispersion + delay / 2; | 207 | * Note: maximum error = NTP synch distance = dispersion + delay / 2; |
207 | * estimated error = NTP dispersion. | 208 | * estimated error = NTP dispersion. |