| /* |
| * Copyright (c) 2011-2015 Wind River Systems, Inc. |
| * Copyright (c) 2017 Oticon A/S |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| /** |
| * @file CPU power management code for POSIX |
| * |
| * This module provides: |
| * |
| * An implementation of the architecture-specific |
| * k_cpu_idle() primitive required by the kernel idle loop component. |
| * It can be called within an implementation of _sys_power_save_idle(), |
| * which is provided for the kernel by the platform. |
| * |
| * An implementation of k_cpu_atomic_idle(), which |
| * atomically re-enables interrupts and enters low power mode. |
| * |
| * A weak stub for sys_arch_reboot(), which does nothing |
| */ |
| |
| #include "posix_core.h" |
| #include "posix_soc_if.h" |
| #include <debug/tracing.h> |
| |
| /** |
| * |
| * @brief Power save idle routine for IA-32 |
| * |
| * This function will be called by the kernel idle loop or possibly within |
| * an implementation of _sys_power_save_idle in the kernel when the |
| * '_sys_power_save_flag' variable is non-zero. |
| * |
| * This function is just a pass thru to the SOC one |
| * |
| * @return N/A |
| */ |
| void k_cpu_idle(void) |
| { |
| z_sys_trace_idle(); |
| posix_irq_full_unlock(); |
| posix_halt_cpu(); |
| } |
| |
| /** |
| * |
| * @brief Atomically re-enable interrupts and enter low power mode |
| * |
| * INTERNAL |
| * The requirements for k_cpu_atomic_idle() are as follows: |
| * 1) The enablement of interrupts and entering a low-power mode needs to be |
| * atomic, i.e. there should be no period of time where interrupts are |
| * enabled before the processor enters a low-power mode. See the comments |
| * in k_lifo_get(), for example, of the race condition that |
| * occurs if this requirement is not met. |
| * |
| * 2) After waking up from the low-power mode, the interrupt lockout state |
| * must be restored as indicated in the 'key' input parameter. |
| * |
| * This function is just a pass thru to the SOC one |
| * |
| * @return N/A |
| */ |
| void k_cpu_atomic_idle(unsigned int key) |
| { |
| z_sys_trace_idle(); |
| posix_atomic_halt_cpu(key); |
| } |
| |
| #if defined(CONFIG_REBOOT) |
| /** |
| * |
| * @brief Stub for sys_arch_reboot |
| * |
| * Does nothing |
| * |
| * @return N/A |
| */ |
| void __weak sys_arch_reboot(int type) |
| { |
| ARG_UNUSED(type); |
| } |
| #endif /* CONFIG_REBOOT */ |