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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hotplug.c (1007B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Copyright 2011 Freescale Semiconductor, Inc.
      4 * Copyright 2011 Linaro Ltd.
      5 */
      6
      7#include <linux/errno.h>
      8#include <linux/jiffies.h>
      9#include <asm/cacheflush.h>
     10#include <asm/cp15.h>
     11#include <asm/proc-fns.h>
     12
     13#include "common.h"
     14#include "hardware.h"
     15
     16/*
     17 * platform-specific code to shutdown a CPU
     18 *
     19 * Called with IRQs disabled
     20 */
     21void imx_cpu_die(unsigned int cpu)
     22{
     23	v7_exit_coherency_flush(louis);
     24	/*
     25	 * We use the cpu jumping argument register to sync with
     26	 * imx_cpu_kill() which is running on cpu0 and waiting for
     27	 * the register being cleared to kill the cpu.
     28	 */
     29	imx_set_cpu_arg(cpu, ~0);
     30
     31	while (1)
     32		cpu_do_idle();
     33}
     34
     35int imx_cpu_kill(unsigned int cpu)
     36{
     37	unsigned long timeout = jiffies + msecs_to_jiffies(50);
     38
     39	while (imx_get_cpu_arg(cpu) == 0)
     40		if (time_after(jiffies, timeout))
     41			return 0;
     42	imx_enable_cpu(cpu, false);
     43	imx_set_cpu_arg(cpu, 0);
     44	if (cpu_is_imx7d())
     45		imx_gpcv2_set_core1_pdn_pup_by_software(true);
     46	return 1;
     47}