cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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idle.c (918B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Low-level idle sequences
      4 */
      5
      6#include <linux/cpu.h>
      7#include <linux/irqflags.h>
      8
      9#include <asm/barrier.h>
     10#include <asm/cpuidle.h>
     11#include <asm/cpufeature.h>
     12#include <asm/sysreg.h>
     13
     14/*
     15 *	cpu_do_idle()
     16 *
     17 *	Idle the processor (wait for interrupt).
     18 *
     19 *	If the CPU supports priority masking we must do additional work to
     20 *	ensure that interrupts are not masked at the PMR (because the core will
     21 *	not wake up if we block the wake up signal in the interrupt controller).
     22 */
     23void noinstr cpu_do_idle(void)
     24{
     25	struct arm_cpuidle_irq_context context;
     26
     27	arm_cpuidle_save_irq_context(&context);
     28
     29	dsb(sy);
     30	wfi();
     31
     32	arm_cpuidle_restore_irq_context(&context);
     33}
     34
     35/*
     36 * This is our default idle handler.
     37 */
     38void noinstr arch_cpu_idle(void)
     39{
     40	/*
     41	 * This should do all the clock switching and wait for interrupt
     42	 * tricks
     43	 */
     44	cpu_do_idle();
     45	raw_local_irq_enable();
     46}