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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cpu_ops.c (888B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (c) 2020 Western Digital Corporation or its affiliates.
      4 */
      5
      6#include <linux/errno.h>
      7#include <linux/mm.h>
      8#include <linux/of.h>
      9#include <linux/string.h>
     10#include <linux/sched.h>
     11#include <asm/cpu_ops.h>
     12#include <asm/sbi.h>
     13#include <asm/smp.h>
     14
     15const struct cpu_operations *cpu_ops[NR_CPUS] __ro_after_init;
     16
     17extern const struct cpu_operations cpu_ops_sbi;
     18#ifdef CONFIG_RISCV_BOOT_SPINWAIT
     19extern const struct cpu_operations cpu_ops_spinwait;
     20#else
     21const struct cpu_operations cpu_ops_spinwait = {
     22	.name		= "",
     23	.cpu_prepare	= NULL,
     24	.cpu_start	= NULL,
     25};
     26#endif
     27
     28void __init cpu_set_ops(int cpuid)
     29{
     30#if IS_ENABLED(CONFIG_RISCV_SBI)
     31	if (sbi_probe_extension(SBI_EXT_HSM) > 0) {
     32		if (!cpuid)
     33			pr_info("SBI HSM extension detected\n");
     34		cpu_ops[cpuid] = &cpu_ops_sbi;
     35	} else
     36#endif
     37		cpu_ops[cpuid] = &cpu_ops_spinwait;
     38}