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42 lines
1.3 KiB
C
Executable File
42 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 <stdint.h>
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#if defined(__x86_64__) && !(defined(__GNUC__) && defined(DEBUG_BUILD))
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static int32_t s_cpuid_output = 0;
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static int s_cpuid_ran = 0;
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int aws_checksums_do_cpu_id(int32_t *cpuid) {
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if (!s_cpuid_ran) {
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asm volatile("XOR %%rax, %%rax # zero the eax register\n"
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"INC %%eax # eax=1 for processor feature bits\n"
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"CPUID #get feature bits\n"
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: "=c"(s_cpuid_output)
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: // none
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: "%rax", "%rbx", "%rdx", "cc");
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s_cpuid_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 /* defined(__x86_64__) && !(defined(__GNUC__) && defined(DEBUG_BUILD)) */
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