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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platsmp.c (3496B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright 2010-2011 Calxeda, Inc.
      4 * Copyright 2012 Pavel Machek <pavel@denx.de>
      5 * Based on platsmp.c, Copyright (C) 2002 ARM Ltd.
      6 * Copyright (C) 2012 Altera Corporation
      7 */
      8#include <linux/delay.h>
      9#include <linux/init.h>
     10#include <linux/smp.h>
     11#include <linux/io.h>
     12#include <linux/of.h>
     13#include <linux/of_address.h>
     14
     15#include <asm/cacheflush.h>
     16#include <asm/smp_scu.h>
     17#include <asm/smp_plat.h>
     18
     19#include "core.h"
     20
     21static int socfpga_boot_secondary(unsigned int cpu, struct task_struct *idle)
     22{
     23	int trampoline_size = secondary_trampoline_end - secondary_trampoline;
     24
     25	if (socfpga_cpu1start_addr) {
     26		/* This will put CPU #1 into reset. */
     27		writel(RSTMGR_MPUMODRST_CPU1,
     28		       rst_manager_base_addr + SOCFPGA_RSTMGR_MODMPURST);
     29
     30		memcpy(phys_to_virt(0), secondary_trampoline, trampoline_size);
     31
     32		writel(__pa_symbol(secondary_startup),
     33		       sys_manager_base_addr + (socfpga_cpu1start_addr & 0x000000ff));
     34
     35		flush_cache_all();
     36		smp_wmb();
     37		outer_clean_range(0, trampoline_size);
     38
     39		/* This will release CPU #1 out of reset. */
     40		writel(0, rst_manager_base_addr + SOCFPGA_RSTMGR_MODMPURST);
     41	}
     42
     43	return 0;
     44}
     45
     46static int socfpga_a10_boot_secondary(unsigned int cpu, struct task_struct *idle)
     47{
     48	int trampoline_size = secondary_trampoline_end - secondary_trampoline;
     49
     50	if (socfpga_cpu1start_addr) {
     51		writel(RSTMGR_MPUMODRST_CPU1, rst_manager_base_addr +
     52		       SOCFPGA_A10_RSTMGR_MODMPURST);
     53		memcpy(phys_to_virt(0), secondary_trampoline, trampoline_size);
     54
     55		writel(__pa_symbol(secondary_startup),
     56		       sys_manager_base_addr + (socfpga_cpu1start_addr & 0x00000fff));
     57
     58		flush_cache_all();
     59		smp_wmb();
     60		outer_clean_range(0, trampoline_size);
     61
     62		/* This will release CPU #1 out of reset. */
     63		writel(0, rst_manager_base_addr + SOCFPGA_A10_RSTMGR_MODMPURST);
     64	}
     65
     66	return 0;
     67}
     68
     69static void __init socfpga_smp_prepare_cpus(unsigned int max_cpus)
     70{
     71	struct device_node *np;
     72	void __iomem *socfpga_scu_base_addr;
     73
     74	np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
     75	if (!np) {
     76		pr_err("%s: missing scu\n", __func__);
     77		return;
     78	}
     79
     80	socfpga_scu_base_addr = of_iomap(np, 0);
     81	if (!socfpga_scu_base_addr)
     82		return;
     83	scu_enable(socfpga_scu_base_addr);
     84}
     85
     86#ifdef CONFIG_HOTPLUG_CPU
     87/*
     88 * platform-specific code to shutdown a CPU
     89 *
     90 * Called with IRQs disabled
     91 */
     92static void socfpga_cpu_die(unsigned int cpu)
     93{
     94	/* Do WFI. If we wake up early, go back into WFI */
     95	while (1)
     96		cpu_do_idle();
     97}
     98
     99/*
    100 * We need a dummy function so that platform_can_cpu_hotplug() knows
    101 * we support CPU hotplug. However, the function does not need to do
    102 * anything, because CPUs going offline just do WFI. We could reset
    103 * the CPUs but it would increase power consumption.
    104 */
    105static int socfpga_cpu_kill(unsigned int cpu)
    106{
    107	return 1;
    108}
    109#endif
    110
    111static const struct smp_operations socfpga_smp_ops __initconst = {
    112	.smp_prepare_cpus	= socfpga_smp_prepare_cpus,
    113	.smp_boot_secondary	= socfpga_boot_secondary,
    114#ifdef CONFIG_HOTPLUG_CPU
    115	.cpu_die		= socfpga_cpu_die,
    116	.cpu_kill		= socfpga_cpu_kill,
    117#endif
    118};
    119
    120static const struct smp_operations socfpga_a10_smp_ops __initconst = {
    121	.smp_prepare_cpus	= socfpga_smp_prepare_cpus,
    122	.smp_boot_secondary	= socfpga_a10_boot_secondary,
    123#ifdef CONFIG_HOTPLUG_CPU
    124	.cpu_die		= socfpga_cpu_die,
    125	.cpu_kill		= socfpga_cpu_kill,
    126#endif
    127};
    128
    129CPU_METHOD_OF_DECLARE(socfpga_smp, "altr,socfpga-smp", &socfpga_smp_ops);
    130CPU_METHOD_OF_DECLARE(socfpga_a10_smp, "altr,socfpga-a10-smp", &socfpga_a10_smp_ops);