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
185
186
187
188
189
190
|
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2011 The ChromiumOS Authors. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc.
*/
#include <stddef.h>
#include <stdint.h>
#include <console/console.h>
#include <cbmem.h>
#include <timer.h>
#include <timestamp.h>
#include <arch/early_variables.h>
#include <rules.h>
#include <smp/node.h>
#define MAX_TIMESTAMPS 60
static struct timestamp_table* ts_table_p CAR_GLOBAL = NULL;
static uint64_t ts_basetime CAR_GLOBAL = 0;
static void timestamp_stash(enum timestamp_id id, uint64_t ts_time);
static void timestamp_real_init(uint64_t base)
{
struct timestamp_table* tst;
tst = cbmem_add(CBMEM_ID_TIMESTAMP,
sizeof(struct timestamp_table) +
MAX_TIMESTAMPS * sizeof(struct timestamp_entry));
if (!tst)
return;
tst->base_time = base;
tst->max_entries = MAX_TIMESTAMPS;
tst->num_entries = 0;
car_set_var(ts_table_p, tst);
}
/* Determine if one should proceed into timestamp code. This is for protecting
* systems that have multiple processors running in romstage -- namely AMD
* based x86 platforms. */
static int timestamp_should_run(void)
{
/* Only check boot_cpu() in other stages than ramstage on x86. */
if ((!ENV_RAMSTAGE && IS_ENABLED(CONFIG_ARCH_X86)) && !boot_cpu())
return 0;
return 1;
}
void timestamp_add(enum timestamp_id id, uint64_t ts_time)
{
struct timestamp_entry *tse;
struct timestamp_table *ts_table = NULL;
if (!timestamp_should_run())
return;
ts_table = car_get_var(ts_table_p);
if (!ts_table) {
timestamp_stash(id, ts_time);
return;
}
if (ts_table->num_entries == ts_table->max_entries)
return;
tse = &ts_table->entries[ts_table->num_entries++];
tse->entry_id = id;
tse->entry_stamp = ts_time - ts_table->base_time;
}
void timestamp_add_now(enum timestamp_id id)
{
timestamp_add(id, timestamp_get());
}
#define MAX_TIMESTAMP_CACHE 8
struct timestamp_cache {
enum timestamp_id id;
uint64_t time;
} timestamp_cache[MAX_TIMESTAMP_CACHE] CAR_GLOBAL;
static int timestamp_entries CAR_GLOBAL = 0;
/**
* timestamp_stash() allows to temporarily cache timestamps.
* This is needed when timestamping before the CBMEM area
* is initialized. The function timestamp_do_sync() is used to
* write the timestamps to the CBMEM area and this is done as
* part of CAR migration for romstage, and in ramstage main().
*/
static void timestamp_stash(enum timestamp_id id, uint64_t ts_time)
{
struct timestamp_cache *ts_cache = car_get_var(timestamp_cache);
int ts_entries = car_get_var(timestamp_entries);
if (ts_entries >= MAX_TIMESTAMP_CACHE) {
printk(BIOS_ERR, "ERROR: failed to add timestamp to cache\n");
return;
}
ts_cache[ts_entries].id = id;
ts_cache[ts_entries].time = ts_time;
car_set_var(timestamp_entries, ++ts_entries);
}
static void timestamp_do_sync(void)
{
struct timestamp_cache *ts_cache = car_get_var(timestamp_cache);
int ts_entries = car_get_var(timestamp_entries);
int i;
for (i = 0; i < ts_entries; i++)
timestamp_add(ts_cache[i].id, ts_cache[i].time);
car_set_var(timestamp_entries, 0);
}
void timestamp_init(uint64_t base)
{
if (!timestamp_should_run())
return;
#ifdef __PRE_RAM__
/* Copy of basetime, it is too early for CBMEM. */
car_set_var(ts_basetime, base);
#else
struct timestamp_table *tst = NULL;
/* Locate and use an already existing table. */
if (!IS_ENABLED(CONFIG_LATE_CBMEM_INIT))
tst = cbmem_find(CBMEM_ID_TIMESTAMP);
if (tst) {
car_set_var(ts_table_p, tst);
return;
}
/* Copy of basetime, may be too early for CBMEM. */
car_set_var(ts_basetime, base);
timestamp_real_init(base);
#endif
}
void timestamp_reinit(void)
{
if (!timestamp_should_run())
return;
#ifdef __PRE_RAM__
timestamp_real_init(car_get_var(ts_basetime));
#else
if (!car_get_var(ts_table_p))
timestamp_init(car_get_var(ts_basetime));
#endif
if (car_get_var(ts_table_p))
timestamp_do_sync();
}
/* Call timestamp_reinit at CAR migration time. */
CAR_MIGRATE(timestamp_reinit)
/* Provide default timestamp implementation using monotonic timer. */
uint64_t __attribute__((weak)) timestamp_get(void)
{
struct mono_time t1, t2;
if (!IS_ENABLED(CONFIG_HAVE_MONOTONIC_TIMER))
return 0;
mono_time_set_usecs(&t1, 0);
timer_monotonic_get(&t2);
return mono_time_diff_microseconds(&t1, &t2);
}
|
