| /* |
| * Copyright (c) 2021 Espressif Systems (Shanghai) Co., Ltd. |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include <toolchain.h> |
| #include <irq.h> |
| #include <arch/cpu.h> |
| |
| /** |
| * |
| * @brief Power save idle routine |
| * |
| * This function will be called by the kernel idle loop or possibly within |
| * an implementation of _pm_save_idle in the kernel when the |
| * '_pm_save_flag' variable is non-zero. |
| * |
| * @return N/A |
| */ |
| void arch_cpu_idle(void) |
| { |
| /* curiously it arives here with the interrupts masked |
| * so umask it before wait for an event |
| */ |
| arch_irq_unlock(MSTATUS_IEN); |
| |
| /* Wait for interrupt */ |
| __asm__ volatile("wfi"); |
| } |
