cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

cpufeature.h (1751B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * Copyright (C) 2014 Linaro Ltd. <ard.biesheuvel@linaro.org>
      4 */
      5
      6#ifndef __LINUX_CPUFEATURE_H
      7#define __LINUX_CPUFEATURE_H
      8
      9#ifdef CONFIG_GENERIC_CPU_AUTOPROBE
     10
     11#include <linux/init.h>
     12#include <linux/mod_devicetable.h>
     13#include <asm/cpufeature.h>
     14
     15/*
     16 * Macros imported from <asm/cpufeature.h>:
     17 * - cpu_feature(x)		ordinal value of feature called 'x'
     18 * - cpu_have_feature(u32 n)	whether feature #n is available
     19 * - MAX_CPU_FEATURES		upper bound for feature ordinal values
     20 * Optional:
     21 * - CPU_FEATURE_TYPEFMT	format string fragment for printing the cpu type
     22 * - CPU_FEATURE_TYPEVAL	set of values matching the format string above
     23 */
     24
     25#ifndef CPU_FEATURE_TYPEFMT
     26#define CPU_FEATURE_TYPEFMT	"%s"
     27#endif
     28
     29#ifndef CPU_FEATURE_TYPEVAL
     30#define CPU_FEATURE_TYPEVAL	ELF_PLATFORM
     31#endif
     32
     33/*
     34 * Use module_cpu_feature_match(feature, module_init_function) to
     35 * declare that
     36 * a) the module shall be probed upon discovery of CPU feature 'feature'
     37 *    (typically at boot time using udev)
     38 * b) the module must not be loaded if CPU feature 'feature' is not present
     39 *    (not even by manual insmod).
     40 *
     41 * For a list of legal values for 'feature', please consult the file
     42 * 'asm/cpufeature.h' of your favorite architecture.
     43 */
     44#define module_cpu_feature_match(x, __initfunc)			\
     45static struct cpu_feature const __maybe_unused cpu_feature_match_ ## x[] = \
     46	{ { .feature = cpu_feature(x) }, { } };			\
     47MODULE_DEVICE_TABLE(cpu, cpu_feature_match_ ## x);		\
     48								\
     49static int __init cpu_feature_match_ ## x ## _init(void)	\
     50{								\
     51	if (!cpu_have_feature(cpu_feature(x)))			\
     52		return -ENODEV;					\
     53	return __initfunc();					\
     54}								\
     55module_init(cpu_feature_match_ ## x ## _init)
     56
     57#endif
     58#endif