1 /* 2 * Module interface for CPU features 3 * 4 * Copyright IBM Corp. 2015 5 * Author(s): Hendrik Brueckner <email@example.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 */ 30
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