1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
/*
* This file is part of the libpayload project.
*
* Copyright (C) 2008 Advanced Micro Devices, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/**
* @file libc/time.c
* General time functions
*/
#include <libpayload-config.h>
#include <libpayload.h>
#if CONFIG(LP_ARCH_X86) && CONFIG(LP_NVRAM)
#include <arch/rdtsc.h>
#endif
extern u32 cpu_khz;
static struct {
u64 ticks;
time_t secs;
suseconds_t usecs;
} clock;
static void update_clock(void)
{
u64 delta = timer_raw_value() - clock.ticks;
int secs;
static uint64_t ticks_per_sec = 0;
static uint64_t ticks_per_usec = 0;
if (!ticks_per_sec) {
ticks_per_sec = timer_hz();
ticks_per_usec = timer_hz() / 1000000;
}
clock.ticks += delta;
secs = (int) (delta / ticks_per_sec);
clock.secs += secs;
delta -= (secs * ticks_per_sec);
clock.usecs += (int)(delta / ticks_per_usec);
if (clock.usecs > 1000000) {
clock.usecs -= 1000000;
clock.secs++;
}
}
#if CONFIG(LP_NVRAM)
static unsigned int day_of_year(int mon, int day, int year)
{
static u8 mdays[12] = { 31, 28, 31, 30, 31, 30,
31, 31, 30, 31, 30, 31 };
int i, ret = 0;
for(i = 0; i < mon; i++) {
ret += mdays[i];
if (i == 1 && (year % 4))
ret++;
}
return (ret + day);
}
static void gettimeofday_init(void)
{
int days, delta;
struct tm tm;
rtc_read_clock(&tm);
clock.ticks = rdtsc();
/* Calculate the number of days in the year so far */
days = day_of_year(tm.tm_mon, tm.tm_mday, tm.tm_year + 1900);
delta = tm.tm_year - 70;
days += (delta * 365);
/* Figure leap years */
if (delta > 2)
days += (delta - 2) / 4;
clock.secs = (days * 86400) + (tm.tm_hour * 3600) +
(tm.tm_min * 60) + tm.tm_sec;
}
#else
static void gettimeofday_init(void)
{
/* Record the number of ticks */
clock.ticks = timer_raw_value();
}
#endif
/**
* Return the current time expressed as seconds from 00:00:00 UTC, 1 Jan 1970.
*
* @param tp When not NULL, set this to the current time in seconds.
* @return The current time in seconds.
*/
time_t time(time_t *tp)
{
/*
* Call the gtod init when we need it - this keeps the code from
* being included in the binary if we don't need it.
*/
if (!clock.ticks)
gettimeofday_init();
update_clock();
if (tp)
*tp = clock.secs;
return clock.secs;
}
/**
* Return the current time broken into a timeval structure.
*
* @param tv A pointer to a timeval structure.
* @param tz Added for compatibility - not used.
* @return 0 for success (this function cannot return non-zero currently).
*/
int gettimeofday(struct timeval *tv, void *tz)
{
tv->tv_sec = time(NULL);
tv->tv_usec = clock.usecs;
return 0;
}
__attribute__((weak))
void arch_ndelay(uint64_t ns)
{
uint64_t delta = ns * timer_hz() / NSECS_PER_SEC;
uint64_t start = timer_raw_value();
while (timer_raw_value() - start < delta) ;
}
u64 timer_us(u64 base)
{
static u64 hz;
// Only check timer_hz once. Assume it doesn't change.
if (hz == 0) {
hz = timer_hz();
if (hz < 1000000) {
printf("Timer frequency %lld is too low, "
"must be at least 1MHz.\n", hz);
halt();
}
}
return (1000000 * timer_raw_value()) / hz - base;
}
|
