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/*
* 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 <cpu/x86/lapic.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)
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