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.
Note sometimes even coreboot is built with CONFIG_COLLECT_TIMES, 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 ---
arch/x86/cpu/coreboot/timestamp.c | 33 ++++++++++++++++++++------------- 1 file changed, 20 insertions(+), 13 deletions(-)
diff --git a/arch/x86/cpu/coreboot/timestamp.c b/arch/x86/cpu/coreboot/timestamp.c index bd3558a..e6b8790 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. + * + * Note sometimes even coreboot is built with CONFIG_COLLECT_TIMES, + * 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); }