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authorBin Meng <bmeng.cn@gmail.com>2015-01-06 22:14:13 +0800
committerSimon Glass <sjg@chromium.org>2015-01-13 07:25:02 -0800
commit5c564b0d2fd108ebc5fd6bb0081b981ee32ddf0b (patch)
treeedd104af8947f8e9b4575c1c96fc7c9d46f44cbf /arch
parentb2439aecd3091e754d3dc3f8be422fee74180295 (diff)
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x86: coreboot: Set up timer base correctly
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/cpu/coreboot/timestamp.c33
1 files changed, 20 insertions, 13 deletions
diff --git a/arch/x86/cpu/coreboot/timestamp.c b/arch/x86/cpu/coreboot/timestamp.c
index bd3558a..0edee6b 100644
--- a/arch/x86/cpu/coreboot/timestamp.c
+++ b/arch/x86/cpu/coreboot/timestamp.c
@@ -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);
}