47 lines
1009 B
C
47 lines
1009 B
C
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// 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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