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 */ |