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x86: coreboot: Set up timer base correctly

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If coreboot is built with CONFIG_COLLECT_TIMESTAMPS, use the value
of base_time in coreboot's timestamp table as our timer base,
otherwise TSC counter value will be used.

Sometimes even coreboot is built with CONFIG_COLLECT_TIMESTAMPS,
the value of base_time in the timestamp table is still zero, so
we must exclude this case too (this is currently seen on booting
coreboot in qemu).

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Bin Meng 2015-01-06 22:14:13 +08:00 committed by Simon Glass
parent b2439aecd3
commit 5c564b0d2f
1 changed files with 20 additions and 13 deletions
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33
arch/x86/cpu/coreboot/timestamp.c
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@ -3,18 +3,7 @@
*
* 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
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
@ -38,9 +27,27 @@ static struct timestamp_table *ts_table __attribute__((section(".data")));
void timestamp_init(void)
{
#ifdef CONFIG_SYS_X86_TSC_TIMER
uint64_t base_time;
#endif
ts_table = lib_sysinfo.tstamp_table;
#ifdef CONFIG_SYS_X86_TSC_TIMER
timer_set_base(ts_table->base_time);
/*
* If coreboot is built with CONFIG_COLLECT_TIMESTAMPS, use the value
* of base_time in coreboot's timestamp table as our timer base,
* otherwise TSC counter value will be used.
*
* Sometimes even coreboot is built with CONFIG_COLLECT_TIMESTAMPS,
* the value of base_time in the timestamp table is still zero, so
* we must exclude this case too (this is currently seen on booting
* coreboot in qemu)
*/
if (ts_table && ts_table->base_time)
base_time = ts_table->base_time;
else
base_time = rdtsc();
timer_set_base(base_time);
#endif
timestamp_add_now(TS_U_BOOT_INITTED);
}