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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smp-emev2.c (1189B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * SMP support for Emma Mobile EV2
      4 *
      5 * Copyright (C) 2012  Renesas Solutions Corp.
      6 * Copyright (C) 2012  Magnus Damm
      7 */
      8#include <linux/kernel.h>
      9#include <linux/init.h>
     10#include <linux/smp.h>
     11#include <linux/spinlock.h>
     12#include <linux/io.h>
     13#include <linux/delay.h>
     14#include <asm/smp_plat.h>
     15#include <asm/smp_scu.h>
     16
     17#include "common.h"
     18#include "emev2.h"
     19
     20#define EMEV2_SCU_BASE 0x1e000000
     21#define EMEV2_SMU_BASE 0xe0110000
     22#define SMU_GENERAL_REG0 0x7c0
     23
     24static int emev2_boot_secondary(unsigned int cpu, struct task_struct *idle)
     25{
     26	arch_send_wakeup_ipi_mask(cpumask_of(cpu_logical_map(cpu)));
     27	return 0;
     28}
     29
     30static void __init emev2_smp_prepare_cpus(unsigned int max_cpus)
     31{
     32	void __iomem *smu;
     33
     34	/* Tell ROM loader about our vector (in headsmp.S) */
     35	smu = ioremap(EMEV2_SMU_BASE, PAGE_SIZE);
     36	if (smu) {
     37		iowrite32(__pa(shmobile_boot_vector), smu + SMU_GENERAL_REG0);
     38		iounmap(smu);
     39	}
     40
     41	/* setup EMEV2 specific SCU bits */
     42	shmobile_smp_scu_prepare_cpus(EMEV2_SCU_BASE, max_cpus);
     43}
     44
     45const struct smp_operations emev2_smp_ops __initconst = {
     46	.smp_prepare_cpus	= emev2_smp_prepare_cpus,
     47	.smp_boot_secondary	= emev2_boot_secondary,
     48};