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Diffstat (limited to 'arch/s390/include/asm/cpufeature.h')
| -rw-r--r-- | arch/s390/include/asm/cpufeature.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/s390/include/asm/cpufeature.h b/arch/s390/include/asm/cpufeature.h new file mode 100644 index 000000000..1d007c6ed --- /dev/null +++ b/arch/s390/include/asm/cpufeature.h @@ -0,0 +1,30 @@ +/* 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_S390_ ## feat) + +int cpu_have_feature(unsigned int nr); + +#endif /* __ASM_S390_CPUFEATURE_H */ |