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46 lines
1009 B
46 lines
1009 B
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright IBM Corp. 2022 |
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*/ |
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#include <linux/cpufeature.h> |
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#include <linux/bug.h> |
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#include <asm/elf.h> |
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enum { |
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TYPE_HWCAP, |
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TYPE_FACILITY, |
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}; |
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struct s390_cpu_feature { |
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unsigned int type : 4; |
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unsigned int num : 28; |
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}; |
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static struct s390_cpu_feature s390_cpu_features[MAX_CPU_FEATURES] = { |
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[S390_CPU_FEATURE_MSA] = {.type = TYPE_HWCAP, .num = HWCAP_NR_MSA}, |
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[S390_CPU_FEATURE_VXRS] = {.type = TYPE_HWCAP, .num = HWCAP_NR_VXRS}, |
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[S390_CPU_FEATURE_UV] = {.type = TYPE_FACILITY, .num = 158}, |
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}; |
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/* |
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* cpu_have_feature - Test CPU features on module initialization |
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*/ |
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int cpu_have_feature(unsigned int num) |
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{ |
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struct s390_cpu_feature *feature; |
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if (WARN_ON_ONCE(num >= MAX_CPU_FEATURES)) |
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return 0; |
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feature = &s390_cpu_features[num]; |
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switch (feature->type) { |
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case TYPE_HWCAP: |
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return !!(elf_hwcap & BIT(feature->num)); |
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case TYPE_FACILITY: |
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return test_facility(feature->num); |
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default: |
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WARN_ON_ONCE(1); |
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return 0; |
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} |
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} |
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EXPORT_SYMBOL(cpu_have_feature);
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