| /* 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 */ |
