1 /*
2 * Copyright (c) 2021 Espressif Systems (Shanghai) Co., Ltd.
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7 #include <toolchain.h>
8 #include <irq.h>
9 #include <arch/cpu.h>
10
11 /**
12 *
13 * @brief Power save idle routine
14 *
15 * This function will be called by the kernel idle loop or possibly within
16 * an implementation of _pm_save_idle in the kernel when the
17 * '_pm_save_flag' variable is non-zero.
18 *
19 * @return N/A
20 */
arch_cpu_idle(void)21 void arch_cpu_idle(void)
22 {
23 /* curiously it arives here with the interrupts masked
24 * so umask it before wait for an event
25 */
26 arch_irq_unlock(MSTATUS_IEN);
27
28 /* Wait for interrupt */
29 __asm__ volatile("wfi");
30 }
31
