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30 lines
958 B
30 lines
958 B
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Module interface for CPU features |
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* |
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* Copyright IBM Corp. 2015 |
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* Author(s): Hendrik Brueckner <[email protected]> |
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*/ |
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#ifndef __ASM_S390_CPUFEATURE_H |
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#define __ASM_S390_CPUFEATURE_H |
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#include <asm/elf.h> |
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/* Hardware features on Linux on z Systems are indicated by facility bits that |
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* are mapped to the so-called machine flags. Particular machine flags are |
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* then used to define ELF hardware capabilities; most notably hardware flags |
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* that are essential for user space / glibc. |
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* |
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* Restrict the set of exposed CPU features to ELF hardware capabilities for |
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* now. Additional machine flags can be indicated by values larger than |
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* MAX_ELF_HWCAP_FEATURES. |
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*/ |
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#define MAX_ELF_HWCAP_FEATURES (8 * sizeof(elf_hwcap)) |
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#define MAX_CPU_FEATURES MAX_ELF_HWCAP_FEATURES |
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#define cpu_feature(feat) ilog2(HWCAP_ ## feat) |
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int cpu_have_feature(unsigned int nr); |
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#endif /* __ASM_S390_CPUFEATURE_H */
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