Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright (C) 2011 The ChromiumOS Authors. All rights reserved. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; version 2 of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 14 | */ |
| 15 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 16 | #include <assert.h> |
Kyösti Mälkki | b766b1c | 2013-09-07 17:26:08 +0300 | [diff] [blame] | 17 | #include <stddef.h> |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 18 | #include <stdint.h> |
| 19 | #include <console/console.h> |
| 20 | #include <cbmem.h> |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 21 | #include <symbols.h> |
Aaron Durbin | 2daadf8 | 2015-05-01 16:48:54 -0500 | [diff] [blame] | 22 | #include <timer.h> |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 23 | #include <timestamp.h> |
Stefan Reinauer | fd4f413 | 2013-06-19 12:25:44 -0700 | [diff] [blame] | 24 | #include <arch/early_variables.h> |
Aaron Durbin | 2daadf8 | 2015-05-01 16:48:54 -0500 | [diff] [blame] | 25 | #include <rules.h> |
Kyösti Mälkki | 5a5c886 | 2014-01-26 14:41:54 +0200 | [diff] [blame] | 26 | #include <smp/node.h> |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 27 | |
Julius Werner | 69d20c4 | 2016-02-08 19:48:11 -0800 | [diff] [blame] | 28 | #define MAX_TIMESTAMPS 84 |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 29 | |
Julius Werner | 69d20c4 | 2016-02-08 19:48:11 -0800 | [diff] [blame] | 30 | #define MAX_BSS_TIMESTAMP_CACHE 16 |
Kyösti Mälkki | b766b1c | 2013-09-07 17:26:08 +0300 | [diff] [blame] | 31 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 32 | struct __attribute__((__packed__)) timestamp_cache { |
Aaron Durbin | bd1499d | 2015-07-10 01:51:14 -0500 | [diff] [blame] | 33 | uint32_t cache_state; |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 34 | struct timestamp_table table; |
| 35 | /* The struct timestamp_table has a 0 length array as its last field. |
| 36 | * The following 'entries' array serves as the storage space for the |
Julius Werner | 69d20c4 | 2016-02-08 19:48:11 -0800 | [diff] [blame] | 37 | * cache when allocated in the BSS. */ |
| 38 | struct timestamp_entry entries[MAX_BSS_TIMESTAMP_CACHE]; |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 39 | }; |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 40 | |
Julius Werner | 8c09377 | 2016-02-09 16:09:15 -0800 | [diff] [blame] | 41 | DECLARE_OPTIONAL_REGION(timestamp); |
| 42 | |
| 43 | #if defined(__PRE_RAM__) |
| 44 | #define USE_TIMESTAMP_REGION (_timestamp_size > 0) |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 45 | #else |
| 46 | #define USE_TIMESTAMP_REGION 0 |
| 47 | #endif |
| 48 | |
| 49 | /* The cache location will sit in BSS when in ramstage. */ |
| 50 | #define TIMESTAMP_CACHE_IN_BSS ENV_RAMSTAGE |
| 51 | |
| 52 | #define HAS_CBMEM (ENV_ROMSTAGE || ENV_RAMSTAGE) |
| 53 | |
| 54 | /* Storage of cache entries during ramstage prior to cbmem coming online. */ |
| 55 | static struct timestamp_cache timestamp_cache; |
| 56 | |
| 57 | enum { |
| 58 | TIMESTAMP_CACHE_UNINITIALIZED = 0, |
| 59 | TIMESTAMP_CACHE_INITIALIZED, |
| 60 | TIMESTAMP_CACHE_NOT_NEEDED, |
| 61 | }; |
| 62 | |
| 63 | static void timestamp_cache_init(struct timestamp_cache *ts_cache, |
| 64 | uint64_t base) |
| 65 | { |
| 66 | ts_cache->table.num_entries = 0; |
Julius Werner | 69d20c4 | 2016-02-08 19:48:11 -0800 | [diff] [blame] | 67 | ts_cache->table.max_entries = MAX_BSS_TIMESTAMP_CACHE; |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 68 | ts_cache->table.base_time = base; |
| 69 | ts_cache->cache_state = TIMESTAMP_CACHE_INITIALIZED; |
Julius Werner | 69d20c4 | 2016-02-08 19:48:11 -0800 | [diff] [blame] | 70 | |
| 71 | if (USE_TIMESTAMP_REGION) |
| 72 | ts_cache->table.max_entries = (_timestamp_size - |
| 73 | offsetof(struct timestamp_cache, entries)) |
| 74 | / sizeof(struct timestamp_entry); |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 75 | } |
| 76 | |
| 77 | static struct timestamp_cache *timestamp_cache_get(void) |
| 78 | { |
| 79 | struct timestamp_cache *ts_cache = NULL; |
| 80 | |
| 81 | if (TIMESTAMP_CACHE_IN_BSS) { |
| 82 | ts_cache = ×tamp_cache; |
| 83 | } else if (USE_TIMESTAMP_REGION) { |
| 84 | if (_timestamp_size < sizeof(*ts_cache)) |
| 85 | BUG(); |
| 86 | ts_cache = car_get_var_ptr((void *)_timestamp); |
| 87 | } |
| 88 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 89 | return ts_cache; |
| 90 | } |
| 91 | |
| 92 | static struct timestamp_table *timestamp_alloc_cbmem_table(void) |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 93 | { |
| 94 | struct timestamp_table* tst; |
| 95 | |
| 96 | tst = cbmem_add(CBMEM_ID_TIMESTAMP, |
| 97 | sizeof(struct timestamp_table) + |
| 98 | MAX_TIMESTAMPS * sizeof(struct timestamp_entry)); |
| 99 | |
Kyösti Mälkki | e034417 | 2015-05-26 06:23:02 +0300 | [diff] [blame] | 100 | if (!tst) |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 101 | return NULL; |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 102 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 103 | tst->base_time = 0; |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 104 | tst->max_entries = MAX_TIMESTAMPS; |
| 105 | tst->num_entries = 0; |
Kyösti Mälkki | b766b1c | 2013-09-07 17:26:08 +0300 | [diff] [blame] | 106 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 107 | return tst; |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 108 | } |
| 109 | |
Aaron Durbin | 2daadf8 | 2015-05-01 16:48:54 -0500 | [diff] [blame] | 110 | /* Determine if one should proceed into timestamp code. This is for protecting |
| 111 | * systems that have multiple processors running in romstage -- namely AMD |
| 112 | * based x86 platforms. */ |
| 113 | static int timestamp_should_run(void) |
| 114 | { |
| 115 | /* Only check boot_cpu() in other stages than ramstage on x86. */ |
| 116 | if ((!ENV_RAMSTAGE && IS_ENABLED(CONFIG_ARCH_X86)) && !boot_cpu()) |
| 117 | return 0; |
| 118 | |
| 119 | return 1; |
| 120 | } |
| 121 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 122 | static struct timestamp_table *timestamp_table_get(void) |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 123 | { |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 124 | MAYBE_STATIC struct timestamp_table *ts_table = NULL; |
| 125 | struct timestamp_cache *ts_cache; |
Kyösti Mälkki | b766b1c | 2013-09-07 17:26:08 +0300 | [diff] [blame] | 126 | |
Aaron Durbin | 2daadf8 | 2015-05-01 16:48:54 -0500 | [diff] [blame] | 127 | if (!timestamp_should_run()) |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 128 | return NULL; |
Kyösti Mälkki | f56ff90 | 2013-09-08 13:10:28 +0300 | [diff] [blame] | 129 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 130 | if (ts_table != NULL) |
| 131 | return ts_table; |
| 132 | |
| 133 | ts_cache = timestamp_cache_get(); |
| 134 | |
| 135 | if (ts_cache == NULL) { |
| 136 | if (HAS_CBMEM) |
| 137 | ts_table = cbmem_find(CBMEM_ID_TIMESTAMP); |
| 138 | return ts_table; |
| 139 | } |
| 140 | |
| 141 | /* Cache is required. */ |
| 142 | if (ts_cache->cache_state != TIMESTAMP_CACHE_NOT_NEEDED) |
| 143 | return &ts_cache->table; |
| 144 | |
| 145 | /* Cache shouldn't be used but there's no backing store. */ |
| 146 | if (!HAS_CBMEM) |
| 147 | return NULL; |
| 148 | |
| 149 | ts_table = cbmem_find(CBMEM_ID_TIMESTAMP); |
| 150 | |
| 151 | return ts_table; |
| 152 | } |
| 153 | |
| 154 | static void timestamp_add_table_entry(struct timestamp_table *ts_table, |
| 155 | enum timestamp_id id, uint64_t ts_time) |
| 156 | { |
| 157 | struct timestamp_entry *tse; |
| 158 | |
Ben Gardner | f5fd4c9 | 2015-11-20 13:25:25 -0600 | [diff] [blame] | 159 | if (ts_table->num_entries >= ts_table->max_entries) |
Kyösti Mälkki | b766b1c | 2013-09-07 17:26:08 +0300 | [diff] [blame] | 160 | return; |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 161 | |
| 162 | tse = &ts_table->entries[ts_table->num_entries++]; |
| 163 | tse->entry_id = id; |
Stefan Reinauer | 3a6550d | 2013-08-01 13:31:44 -0700 | [diff] [blame] | 164 | tse->entry_stamp = ts_time - ts_table->base_time; |
Ben Gardner | f5fd4c9 | 2015-11-20 13:25:25 -0600 | [diff] [blame] | 165 | |
| 166 | if (ts_table->num_entries == ts_table->max_entries) |
| 167 | printk(BIOS_ERR, "ERROR: Timestamp table full\n"); |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 168 | } |
| 169 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 170 | void timestamp_add(enum timestamp_id id, uint64_t ts_time) |
| 171 | { |
| 172 | struct timestamp_table *ts_table; |
| 173 | |
| 174 | ts_table = timestamp_table_get(); |
| 175 | |
| 176 | if (!ts_table) { |
| 177 | printk(BIOS_ERR, "ERROR: No timestamp table found\n"); |
| 178 | return; |
| 179 | } |
| 180 | |
| 181 | timestamp_add_table_entry(ts_table, id, ts_time); |
| 182 | } |
| 183 | |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 184 | void timestamp_add_now(enum timestamp_id id) |
| 185 | { |
Stefan Reinauer | 3a6550d | 2013-08-01 13:31:44 -0700 | [diff] [blame] | 186 | timestamp_add(id, timestamp_get()); |
Vadim Bendebury | 6f72d69 | 2011-09-21 16:12:39 -0700 | [diff] [blame] | 187 | } |
Stefan Reinauer | 4221a19 | 2012-10-15 15:23:20 -0700 | [diff] [blame] | 188 | |
Stefan Reinauer | 3a6550d | 2013-08-01 13:31:44 -0700 | [diff] [blame] | 189 | void timestamp_init(uint64_t base) |
Kyösti Mälkki | b766b1c | 2013-09-07 17:26:08 +0300 | [diff] [blame] | 190 | { |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 191 | struct timestamp_cache *ts_cache; |
| 192 | |
Aaron Durbin | 2daadf8 | 2015-05-01 16:48:54 -0500 | [diff] [blame] | 193 | if (!timestamp_should_run()) |
Kyösti Mälkki | f56ff90 | 2013-09-08 13:10:28 +0300 | [diff] [blame] | 194 | return; |
| 195 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 196 | ts_cache = timestamp_cache_get(); |
Kyösti Mälkki | b766b1c | 2013-09-07 17:26:08 +0300 | [diff] [blame] | 197 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 198 | if (!ts_cache) { |
| 199 | printk(BIOS_ERR, "ERROR: No timestamp cache to init\n"); |
Kyösti Mälkki | b766b1c | 2013-09-07 17:26:08 +0300 | [diff] [blame] | 200 | return; |
| 201 | } |
Kyösti Mälkki | b766b1c | 2013-09-07 17:26:08 +0300 | [diff] [blame] | 202 | |
Aaron Durbin | bd1499d | 2015-07-10 01:51:14 -0500 | [diff] [blame] | 203 | /* In the EARLY_CBMEM_INIT case timestamps could have already been |
| 204 | * recovered. In those circumstances honor the cache which sits in BSS |
| 205 | * as it has already been initialized. */ |
Aaron Durbin | 2a983bd | 2015-07-11 13:36:01 -0500 | [diff] [blame] | 206 | if (ENV_RAMSTAGE && IS_ENABLED(CONFIG_EARLY_CBMEM_INIT) && |
Aaron Durbin | bd1499d | 2015-07-10 01:51:14 -0500 | [diff] [blame] | 207 | ts_cache->cache_state != TIMESTAMP_CACHE_UNINITIALIZED) |
| 208 | return; |
| 209 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 210 | timestamp_cache_init(ts_cache, base); |
Kyösti Mälkki | b766b1c | 2013-09-07 17:26:08 +0300 | [diff] [blame] | 211 | } |
| 212 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 213 | static void timestamp_sync_cache_to_cbmem(int is_recovery) |
Kyösti Mälkki | b766b1c | 2013-09-07 17:26:08 +0300 | [diff] [blame] | 214 | { |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 215 | uint32_t i; |
| 216 | struct timestamp_cache *ts_cache; |
| 217 | struct timestamp_table *ts_cache_table; |
| 218 | struct timestamp_table *ts_cbmem_table = NULL; |
| 219 | |
Aaron Durbin | 2daadf8 | 2015-05-01 16:48:54 -0500 | [diff] [blame] | 220 | if (!timestamp_should_run()) |
Kyösti Mälkki | f56ff90 | 2013-09-08 13:10:28 +0300 | [diff] [blame] | 221 | return; |
| 222 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 223 | ts_cache = timestamp_cache_get(); |
| 224 | |
| 225 | /* No timestamp cache found */ |
| 226 | if (ts_cache == NULL) { |
| 227 | printk(BIOS_ERR, "ERROR: No timestamp cache found\n"); |
| 228 | return; |
| 229 | } |
| 230 | |
| 231 | ts_cache_table = &ts_cache->table; |
| 232 | |
| 233 | /* cbmem is being recovered. */ |
| 234 | if (is_recovery) { |
| 235 | /* x86 resume path expects timestamps to be reset. */ |
| 236 | if (IS_ENABLED(CONFIG_ARCH_ROMSTAGE_X86_32) && ENV_ROMSTAGE) |
| 237 | ts_cbmem_table = timestamp_alloc_cbmem_table(); |
| 238 | else { |
| 239 | /* Find existing table in cbmem. */ |
| 240 | ts_cbmem_table = cbmem_find(CBMEM_ID_TIMESTAMP); |
| 241 | /* No existing timestamp table. */ |
| 242 | if (ts_cbmem_table == NULL) |
| 243 | ts_cbmem_table = timestamp_alloc_cbmem_table(); |
| 244 | } |
| 245 | } else |
| 246 | /* First time sync. Add new table. */ |
| 247 | ts_cbmem_table = timestamp_alloc_cbmem_table(); |
| 248 | |
| 249 | if (ts_cbmem_table == NULL) { |
| 250 | printk(BIOS_ERR, "ERROR: No timestamp table allocated\n"); |
| 251 | return; |
| 252 | } |
| 253 | |
| 254 | /* |
| 255 | * There's no need to worry about the base_time fields being out of |
Julius Werner | 8c09377 | 2016-02-09 16:09:15 -0800 | [diff] [blame] | 256 | * sync because only the following configurations are used/supported: |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 257 | * |
Julius Werner | 8c09377 | 2016-02-09 16:09:15 -0800 | [diff] [blame] | 258 | * 1. Timestamps get initialized before ramstage, which implies |
| 259 | * CONFIG_EARLY_CBMEM_INIT and CBMEM initialization in romstage. |
| 260 | * This requires the board to define a TIMESTAMP() region in its |
| 261 | * memlayout.ld (default on x86). The base_time from timestamp_init() |
| 262 | * (usually called from bootblock.c on most non-x86 boards) persists |
| 263 | * in that region until it gets synced to CBMEM in romstage. |
| 264 | * In ramstage, the BSS cache's base_time will be 0 until the second |
| 265 | * sync, which will adjust the timestamps in there to the correct |
| 266 | * base_time (from CBMEM) with the timestamp_add_table_entry() below. |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 267 | * |
Julius Werner | 8c09377 | 2016-02-09 16:09:15 -0800 | [diff] [blame] | 268 | * 2. Timestamps only get initialized in ramstage *and* |
| 269 | * CONFIG_LATE_CBMEM_INIT is set. main() will call timestamp_init() |
| 270 | * very early (before any timestamps get logged) to set a base_time |
| 271 | * in the BSS cache, which will later get synced over to CBMEM. |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 272 | * |
Julius Werner | 8c09377 | 2016-02-09 16:09:15 -0800 | [diff] [blame] | 273 | * If you try to initialize timestamps before ramstage but don't define |
| 274 | * a TIMESTAMP region, all operations will fail (safely), and coreboot |
| 275 | * will behave as if timestamps only get initialized in ramstage. |
| 276 | * |
| 277 | * If CONFIG_EARLY_CBMEM_INIT is set but timestamps only get |
| 278 | * initialized in ramstage, the base_time from timestamp_init() will |
| 279 | * get ignored and all timestamps will be 0-based. |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 280 | */ |
| 281 | for (i = 0; i < ts_cache_table->num_entries; i++) { |
| 282 | struct timestamp_entry *tse = &ts_cache_table->entries[i]; |
| 283 | timestamp_add_table_entry(ts_cbmem_table, tse->entry_id, |
| 284 | tse->entry_stamp); |
| 285 | } |
| 286 | |
| 287 | /* Freshly added cbmem table has base_time 0. Inherit cache base_time */ |
| 288 | if (ts_cbmem_table->base_time == 0) |
| 289 | ts_cbmem_table->base_time = ts_cache_table->base_time; |
| 290 | |
Aaron Durbin | c49014e | 2015-08-30 21:19:55 -0500 | [diff] [blame] | 291 | /* Seed the timestamp tick frequency in ramstage. */ |
| 292 | if (ENV_RAMSTAGE) |
| 293 | ts_cbmem_table->tick_freq_mhz = timestamp_tick_freq_mhz(); |
| 294 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 295 | /* Cache no longer required. */ |
| 296 | ts_cache_table->num_entries = 0; |
| 297 | ts_cache->cache_state = TIMESTAMP_CACHE_NOT_NEEDED; |
Kyösti Mälkki | 3d45c40 | 2013-09-07 20:26:36 +0300 | [diff] [blame] | 298 | } |
Kyösti Mälkki | cbf5bdf | 2013-09-10 00:07:21 +0300 | [diff] [blame] | 299 | |
Aaron Durbin | 1936f6c | 2015-07-03 17:04:21 -0500 | [diff] [blame] | 300 | ROMSTAGE_CBMEM_INIT_HOOK(timestamp_sync_cache_to_cbmem) |
| 301 | RAMSTAGE_CBMEM_INIT_HOOK(timestamp_sync_cache_to_cbmem) |
Aaron Durbin | 9e80e27 | 2015-05-01 16:48:54 -0500 | [diff] [blame] | 302 | |
| 303 | /* Provide default timestamp implementation using monotonic timer. */ |
| 304 | uint64_t __attribute__((weak)) timestamp_get(void) |
| 305 | { |
| 306 | struct mono_time t1, t2; |
| 307 | |
Aaron Durbin | 7aafe53 | 2015-05-07 11:32:30 -0500 | [diff] [blame] | 308 | if (!IS_ENABLED(CONFIG_HAVE_MONOTONIC_TIMER)) |
| 309 | return 0; |
| 310 | |
Aaron Durbin | 9e80e27 | 2015-05-01 16:48:54 -0500 | [diff] [blame] | 311 | mono_time_set_usecs(&t1, 0); |
| 312 | timer_monotonic_get(&t2); |
| 313 | |
| 314 | return mono_time_diff_microseconds(&t1, &t2); |
| 315 | } |
Aaron Durbin | c49014e | 2015-08-30 21:19:55 -0500 | [diff] [blame] | 316 | |
| 317 | /* Like timestamp_get() above this matches up with microsecond granularity. */ |
| 318 | int __attribute__((weak)) timestamp_tick_freq_mhz(void) |
| 319 | { |
| 320 | return 1; |
| 321 | } |