| /* |
| * 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., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA |
| */ |
| |
| #include <stddef.h> |
| #include <stdint.h> |
| #include <console/console.h> |
| #include <cbmem.h> |
| #include <timestamp.h> |
| #include <arch/early_variables.h> |
| #include <smp/node.h> |
| |
| #define MAX_TIMESTAMPS 30 |
| |
| static struct timestamp_table* ts_table_p CAR_GLOBAL = NULL; |
| static tsc_t ts_basetime CAR_GLOBAL = { .lo = 0, .hi =0 }; |
| |
| static void timestamp_stash(enum timestamp_id id, tsc_t ts_time); |
| |
| static uint64_t tsc_to_uint64(tsc_t tstamp) |
| { |
| return (((uint64_t)tstamp.hi) << 32) + tstamp.lo; |
| } |
| |
| static void timestamp_real_init(tsc_t base) |
| { |
| struct timestamp_table* tst; |
| |
| tst = cbmem_add(CBMEM_ID_TIMESTAMP, |
| sizeof(struct timestamp_table) + |
| MAX_TIMESTAMPS * sizeof(struct timestamp_entry)); |
| |
| if (!tst) { |
| printk(BIOS_ERR, "ERROR: failed to allocate timestamp table\n"); |
| return; |
| } |
| |
| tst->base_time = tsc_to_uint64(base); |
| tst->max_entries = MAX_TIMESTAMPS; |
| tst->num_entries = 0; |
| |
| car_set_var(ts_table_p, tst); |
| } |
| |
| void timestamp_add(enum timestamp_id id, tsc_t ts_time) |
| { |
| struct timestamp_entry *tse; |
| struct timestamp_table *ts_table = NULL; |
| |
| if (!boot_cpu()) |
| 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 = tsc_to_uint64(ts_time) - ts_table->base_time; |
| } |
| |
| void timestamp_add_now(enum timestamp_id id) |
| { |
| timestamp_add(id, rdtsc()); |
| } |
| |
| #define MAX_TIMESTAMP_CACHE 8 |
| struct timestamp_cache { |
| enum timestamp_id id; |
| tsc_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, tsc_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(tsc_t base) |
| { |
| if (!boot_cpu()) |
| return; |
| |
| #ifdef __PRE_RAM__ |
| /* Copy of basetime, it is too early for CBMEM. */ |
| car_set_var(ts_basetime, base); |
| #else |
| struct timestamp_table* tst; |
| |
| /* Locate and use an already existing table. */ |
| 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 (!boot_cpu()) |
| 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) |