mirror of
https://github.com/zephyrproject-rtos/zephyr
synced 2025-08-17 03:06:06 +00:00
cc334c7273
Convert code to use u{8,16,32,64}_t and s{8,16,32,64}_t instead of C99
integer types. This handles the remaining includes and kernel, plus
touching up various points that we skipped because of include
dependancies. We also convert the PRI printf formatters in the arch
code over to normal formatters.
Jira: ZEP-2051
Change-Id: Iecbb12601a3ee4ea936fd7ddea37788a645b08b0
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
150 lines
3.6 KiB
C
150 lines
3.6 KiB
C
/*
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* Copyright (c) 2016 Wind River Systems, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <kernel.h>
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#include <kernel_structs.h>
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#include <toolchain.h>
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#include <sections.h>
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#include <drivers/system_timer.h>
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#include <wait_q.h>
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#include <power.h>
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#if defined(CONFIG_TICKLESS_IDLE)
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/*
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* Idle time must be this value or higher for timer to go into tickless idle
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* state.
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*/
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s32_t _sys_idle_threshold_ticks = CONFIG_TICKLESS_IDLE_THRESH;
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#endif /* CONFIG_TICKLESS_IDLE */
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#ifdef CONFIG_SYS_POWER_MANAGEMENT
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/*
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* Used to allow _sys_soc_suspend() implementation to control notification
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* of the event that caused exit from kernel idling after pm operations.
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*/
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unsigned char _sys_pm_idle_exit_notify;
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void __attribute__((weak)) _sys_soc_resume(void)
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{
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}
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void __attribute__((weak)) _sys_soc_resume_from_deep_sleep(void)
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{
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}
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/**
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*
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* @brief Indicate that kernel is idling in tickless mode
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*
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* Sets the kernel data structure idle field to either a positive value or
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* K_FOREVER.
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*
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* @param ticks the number of ticks to idle
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*
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* @return N/A
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*/
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static void set_kernel_idle_time_in_ticks(s32_t ticks)
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{
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_kernel.idle = ticks;
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}
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#else
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#define set_kernel_idle_time_in_ticks(x) do { } while (0)
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#endif
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static void _sys_power_save_idle(s32_t ticks __unused)
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{
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#if defined(CONFIG_TICKLESS_IDLE)
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if ((ticks == K_FOREVER) || ticks >= _sys_idle_threshold_ticks) {
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/*
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* Stop generating system timer interrupts until it's time for
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* the next scheduled kernel timer to expire.
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*/
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_timer_idle_enter(ticks);
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}
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#endif /* CONFIG_TICKLESS_IDLE */
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set_kernel_idle_time_in_ticks(ticks);
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#if (defined(CONFIG_SYS_POWER_LOW_POWER_STATE) || \
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defined(CONFIG_SYS_POWER_DEEP_SLEEP))
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_sys_pm_idle_exit_notify = 1;
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/*
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* Call the suspend hook function of the soc interface to allow
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* entry into a low power state. The function returns
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* SYS_PM_NOT_HANDLED if low power state was not entered, in which
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* case, kernel does normal idle processing.
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*
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* This function is entered with interrupts disabled. If a low power
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* state was entered, then the hook function should enable inerrupts
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* before exiting. This is because the kernel does not do its own idle
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* processing in those cases i.e. skips k_cpu_idle(). The kernel's
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* idle processing re-enables interrupts which is essential for
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* the kernel's scheduling logic.
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*/
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if (_sys_soc_suspend(ticks) == SYS_PM_NOT_HANDLED) {
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_sys_pm_idle_exit_notify = 0;
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k_cpu_idle();
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}
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#else
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k_cpu_idle();
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#endif
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}
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void _sys_power_save_idle_exit(s32_t ticks)
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{
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#if defined(CONFIG_SYS_POWER_LOW_POWER_STATE)
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/* Some CPU low power states require notification at the ISR
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* to allow any operations that needs to be done before kernel
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* switches task or processes nested interrupts. This can be
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* disabled by calling _sys_soc_pm_idle_exit_notification_disable().
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* Alternatively it can be simply ignored if not required.
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*/
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if (_sys_pm_idle_exit_notify) {
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_sys_soc_resume();
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}
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#endif
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#ifdef CONFIG_TICKLESS_IDLE
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if ((ticks == K_FOREVER) || ticks >= _sys_idle_threshold_ticks) {
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/* Resume normal periodic system timer interrupts */
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_timer_idle_exit();
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}
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#else
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ARG_UNUSED(ticks);
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#endif /* CONFIG_TICKLESS_IDLE */
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}
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#if K_IDLE_PRIO < 0
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#define IDLE_YIELD_IF_COOP() k_yield()
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#else
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#define IDLE_YIELD_IF_COOP() do { } while ((0))
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#endif
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void idle(void *unused1, void *unused2, void *unused3)
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{
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ARG_UNUSED(unused1);
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ARG_UNUSED(unused2);
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ARG_UNUSED(unused3);
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#ifdef CONFIG_BOOT_TIME_MEASUREMENT
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/* record timestamp when idling begins */
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extern u64_t __idle_tsc;
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__idle_tsc = _tsc_read();
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#endif
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for (;;) {
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(void)irq_lock();
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_sys_power_save_idle(_get_next_timeout_expiry());
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IDLE_YIELD_IF_COOP();
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}
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}
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