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/* SPDX-License-Identifier: GPL-2.0 */
* Module interface for CPU features
* Copyright IBM Corp. 2015
* Author(s): Hendrik Brueckner <>
#ifndef __ASM_S390_CPUFEATURE_H
#define __ASM_S390_CPUFEATURE_H
#include <asm/elf.h>
/* Hardware features on Linux on z Systems are indicated by facility bits that
* are mapped to the so-called machine flags. Particular machine flags are
* then used to define ELF hardware capabilities; most notably hardware flags
* that are essential for user space / glibc.
* Restrict the set of exposed CPU features to ELF hardware capabilities for
* now. Additional machine flags can be indicated by values larger than
#define MAX_ELF_HWCAP_FEATURES (8 * sizeof(elf_hwcap))
#define cpu_feature(feat) ilog2(HWCAP_ ## feat)
int cpu_have_feature(unsigned int nr);
#endif /* __ASM_S390_CPUFEATURE_H */