projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 8f00b3e2 HB |
1 | /* |
| 2 | * Module interface for CPU features | |
| 3 | * | |
| 4 | * Copyright IBM Corp. 2015 | |
| 5 | * Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com> | |
| 6 | */ | |
| 7 | ||
| 8 | #ifndef __ASM_S390_CPUFEATURE_H | |
| 9 | #define __ASM_S390_CPUFEATURE_H | |
| 10 | ||
| 11 | #include <asm/elf.h> | |
| 12 | ||
| 13 | /* Hardware features on Linux on z Systems are indicated by facility bits that | |
| 14 | * are mapped to the so-called machine flags. Particular machine flags are | |
| 15 | * then used to define ELF hardware capabilities; most notably hardware flags | |
| 16 | * that are essential for user space / glibc. | |
| 17 | * | |
| 18 | * Restrict the set of exposed CPU features to ELF hardware capabilities for | |
| 19 | * now. Additional machine flags can be indicated by values larger than | |
| 20 | * MAX_ELF_HWCAP_FEATURES. | |
| 21 | */ | |
| 22 | #define MAX_ELF_HWCAP_FEATURES (8 * sizeof(elf_hwcap)) | |
| 23 | #define MAX_CPU_FEATURES MAX_ELF_HWCAP_FEATURES | |
| 24 | ||
| 25 | #define cpu_feature(feat) ilog2(HWCAP_S390_ ## feat) | |
| 26 | ||
| 27 | int cpu_have_feature(unsigned int nr); | |
| 28 | ||
| 29 | #endif /* __ASM_S390_CPUFEATURE_H */ |