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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omap-hotplug.c (1459B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * OMAP4 SMP cpu-hotplug support
      4 *
      5 * Copyright (C) 2010 Texas Instruments, Inc.
      6 * Author:
      7 *      Santosh Shilimkar <santosh.shilimkar@ti.com>
      8 *
      9 * Platform file needed for the OMAP4 SMP. This file is based on arm
     10 * realview smp platform.
     11 * Copyright (c) 2002 ARM Limited.
     12 */
     13
     14#include <linux/kernel.h>
     15#include <linux/errno.h>
     16#include <linux/smp.h>
     17#include <linux/io.h>
     18
     19#include "omap-wakeupgen.h"
     20#include "common.h"
     21#include "powerdomain.h"
     22
     23/*
     24 * platform-specific code to shutdown a CPU
     25 * Called with IRQs disabled
     26 */
     27void omap4_cpu_die(unsigned int cpu)
     28{
     29	unsigned int boot_cpu = 0;
     30	void __iomem *base = omap_get_wakeupgen_base();
     31
     32	/*
     33	 * we're ready for shutdown now, so do it
     34	 */
     35	if (omap_secure_apis_support()) {
     36		if (omap_modify_auxcoreboot0(0x0, 0x200) != 0x0)
     37			pr_err("Secure clear status failed\n");
     38	} else {
     39		writel_relaxed(0, base + OMAP_AUX_CORE_BOOT_0);
     40	}
     41
     42
     43	for (;;) {
     44		/*
     45		 * Enter into low power state
     46		 */
     47		omap4_hotplug_cpu(cpu, PWRDM_POWER_OFF);
     48
     49		if (omap_secure_apis_support())
     50			boot_cpu = omap_read_auxcoreboot0() >> 9;
     51		else
     52			boot_cpu =
     53				readl_relaxed(base + OMAP_AUX_CORE_BOOT_0) >> 5;
     54
     55		if (boot_cpu == smp_processor_id()) {
     56			/*
     57			 * OK, proper wakeup, we're done
     58			 */
     59			break;
     60		}
     61		pr_debug("CPU%u: spurious wakeup call\n", cpu);
     62	}
     63}
     64
     65/* Needed by kexec and platform_can_cpu_hotplug() */
     66int omap4_cpu_kill(unsigned int cpu)
     67{
     68	return 1;
     69}