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kernel: retrieve system timer clock frequency at runtime or static

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update kernel timeout logic based on retrieve system timer clock
frequency at runtime or static way based on Kconfig
TIMER_READS_ITS_FREQUENCY_AT_RUNTIME

Signed-off-by: Najumon B.A <najumon.ba@intel.com>
This commit is contained in:
Najumon B.A 2024-03-02 12:00:41 +05:30 • committed by Johan Hedberg
commit 7c03e5de7f
3 changed files with 6 additions and 5 deletions
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8
include/zephyr/sys_clock.h
View file

@ -146,9 +146,9 @@ typedef struct {
/** @endcond */ /** @endcond */
#if defined(CONFIG_SYS_CLOCK_EXISTS) && \ #if defined(CONFIG_SYS_CLOCK_EXISTS) && !defined(CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME)
(CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC == 0) BUILD_ASSERT(CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC != 0,
#error "SYS_CLOCK_HW_CYCLES_PER_SEC must be non-zero!" "SYS_CLOCK_HW_CYCLES_PER_SEC must be non-zero!");
#endif #endif
@ -164,7 +164,7 @@ typedef struct {
* @{ * @{
*/ */
#ifdef CONFIG_SYS_CLOCK_EXISTS #if defined(CONFIG_SYS_CLOCK_EXISTS) && !defined(CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME)
#if defined(CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME) || \ #if defined(CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME) || \
(MSEC_PER_SEC % CONFIG_SYS_CLOCK_TICKS_PER_SEC) || \ (MSEC_PER_SEC % CONFIG_SYS_CLOCK_TICKS_PER_SEC) || \

1
kernel/Kconfig
View file

@ -799,6 +799,7 @@ config SYS_CLOCK_TICKS_PER_SEC
config SYS_CLOCK_HW_CYCLES_PER_SEC config SYS_CLOCK_HW_CYCLES_PER_SEC
int "System clock's h/w timer frequency" int "System clock's h/w timer frequency"
depends on !TIMER_READS_ITS_FREQUENCY_AT_RUNTIME
help help
This option specifies the frequency of the hardware timer used for the This option specifies the frequency of the hardware timer used for the
system clock (in Hz). This option is set by the SOC's or board's Kconfig file system clock (in Hz). This option is set by the SOC's or board's Kconfig file

2
kernel/timeout.c
View file

@ -25,7 +25,7 @@ static struct k_spinlock timeout_lock;
static int announce_remaining; static int announce_remaining;
#if defined(CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME) #if defined(CONFIG_TIMER_READS_ITS_FREQUENCY_AT_RUNTIME)
int z_clock_hw_cycles_per_sec = CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC; int z_clock_hw_cycles_per_sec;
#ifdef CONFIG_USERSPACE #ifdef CONFIG_USERSPACE
static inline int z_vrfy_sys_clock_hw_cycles_per_sec_runtime_get(void) static inline int z_vrfy_sys_clock_hw_cycles_per_sec_runtime_get(void)