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arch: arc: make the boot time more accurate

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* start timer0 when cpu runs at __start
* add an offset to cycle_count

Signed-off-by: Wayne Ren <wei.ren@synopsys.com>
This commit is contained in:
Wayne Ren 2019-03-19 17:06:25 +08:00 committed by Anas Nashif
parent 2b1227f155
commit 7051eecaed
2 changed files with 13 additions and 1 deletions
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11
arch/arc/core/reset.S
View file

@ -49,7 +49,16 @@ SECTION_FUNC(TEXT,__start)
*/
mov r0, 0
kflag r0
#if defined(CONFIG_BOOT_TIME_MEASUREMENT) && defined(CONFIG_ARCV2_TIMER)
/*
* ARCV2 timer (timer0) is a free run timer, let it start to count
* here.
*/
mov r0, 0xffffffff
sr r0, [_ARC_V2_TMR0_LIMIT]
mov r0, 0
sr r0, [_ARC_V2_TMR0_COUNT]
#endif
/* interrupt related init */
sr r0, [_ARC_V2_AUX_IRQ_ACT]
sr r0, [_ARC_V2_AUX_IRQ_CTRL]

3
drivers/timer/arcv2_timer0.c
View file

@ -167,6 +167,9 @@ int z_clock_driver_init(struct device *device)
_timer_int_handler, NULL, 0);
timer0_limit_register_set(last_load - 1);
#ifdef CONFIG_BOOT_TIME_MEASUREMENT
cycle_count = timer0_count_register_get();
#endif
timer0_count_register_set(0);
timer0_control_register_set(_ARC_V2_TMR_CTRL_NH | _ARC_V2_TMR_CTRL_IE);