/* SPDX-License-Identifier: GPL-2.0 */ /* * Module interface for CPU features * * Copyright IBM Corp. 2015 * Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com> */ #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 * MAX_ELF_HWCAP_FEATURES. */ #define MAX_ELF_HWCAP_FEATURES (8 * sizeof(elf_hwcap)) #define MAX_CPU_FEATURES MAX_ELF_HWCAP_FEATURES #define cpu_feature(feat) ilog2(HWCAP_ ## feat) int cpu_have_feature(unsigned int nr); #endif /* __ASM_S390_CPUFEATURE_H */