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 (958B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * Module interface for CPU features
      4 *
      5 * Copyright IBM Corp. 2015
      6 * Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
      7 */
      8
      9#ifndef __ASM_S390_CPUFEATURE_H
     10#define __ASM_S390_CPUFEATURE_H
     11
     12#include <asm/elf.h>
     13
     14/* Hardware features on Linux on z Systems are indicated by facility bits that
     15 * are mapped to the so-called machine flags.  Particular machine flags are
     16 * then used to define ELF hardware capabilities; most notably hardware flags
     17 * that are essential for user space / glibc.
     18 *
     19 * Restrict the set of exposed CPU features to ELF hardware capabilities for
     20 * now.  Additional machine flags can be indicated by values larger than
     21 * MAX_ELF_HWCAP_FEATURES.
     22 */
     23#define MAX_ELF_HWCAP_FEATURES	(8 * sizeof(elf_hwcap))
     24#define MAX_CPU_FEATURES	MAX_ELF_HWCAP_FEATURES
     25
     26#define cpu_feature(feat)	ilog2(HWCAP_ ## feat)
     27
     28int cpu_have_feature(unsigned int nr);
     29
     30#endif /* __ASM_S390_CPUFEATURE_H */