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8f00b3e28f
Add support for the generic CPU feature modalias implementation that wires up optional CPU features to udev-based module autoprobing. The <asm/cpufeature.h> file provides definitions to map CPU features to s390 ELF hardware capabilities. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
29 lines
924 B
C
29 lines
924 B
C
/*
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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 <brueckner@linux.vnet.ibm.com>
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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_S390_ ## 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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