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53 lines
1.3 KiB
C
Executable File
53 lines
1.3 KiB
C
Executable File
/*
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* Copyright 2010-2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License").
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* You may not use this file except in compliance with the License.
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* A copy of the License is located at
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*
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* http://aws.amazon.com/apache2.0
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*
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* or in the "license" file accompanying this file. This file is distributed
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* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
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* express or implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*/
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#include <aws/checksums/private/cpuid.h>
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#include <intrin.h>
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#include <inttypes.h>
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#if defined(_M_X64) || defined(_M_IX86)
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static int s_cpuid_check_ran = 0;
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static int32_t s_cpuid_output = 0;
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int aws_checksums_is_cpuid_supported(void) {
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return 1;
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}
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int aws_checksums_do_cpu_id(int32_t *cpuid) {
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if (!s_cpuid_check_ran) {
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int cpu_info[4] = {-1};
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__cpuid(cpu_info, 0);
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unsigned nIds_ = cpu_info[0];
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__cpuid(cpu_info, 0);
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if (nIds_ >= 2) {
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__cpuid(cpu_info, 1);
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s_cpuid_output = cpu_info[2];
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} else {
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return 0;
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}
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s_cpuid_check_ran = 1;
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}
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*cpuid = s_cpuid_output;
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return 1;
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}
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#endif
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