2018-01-16 14:44:06 +08:00
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/*
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+----------------------------------------------------------------------+
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| Zend Engine |
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+----------------------------------------------------------------------+
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| Copyright (c) 2018-2018 Zend Technologies Ltd. (http://www.zend.com) |
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+----------------------------------------------------------------------+
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| This source file is subject to version 2.00 of the Zend license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.zend.com/license/2_00.txt. |
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| If you did not receive a copy of the Zend license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@zend.com so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Xinchen Hui <xinchen.h@zend.com> |
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+----------------------------------------------------------------------+
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*/
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#include "zend.h"
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#include "zend_cpuinfo.h"
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typedef struct _zend_cpu_info {
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uint32_t eax;
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uint32_t ebx;
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uint32_t ecx;
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uint32_t edx;
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uint32_t initialized;
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} zend_cpu_info;
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static zend_cpu_info cpuinfo;
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#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
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static void __zend_cpuid(uint32_t func, uint32_t subfunc) {
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__asm__ __volatile__ (
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"cpuid"
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: "=a"(cpuinfo.eax), "=b"(cpuinfo.ebx), "=c"(cpuinfo.ecx), "=d"(cpuinfo.edx)
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: "a"(func), "c"(subfunc)
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);
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}
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#elif defined(ZEND_WIN32)
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# include <intrin.h>
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static void __zend_cpuid(uint32_t func, uint32_t subfunc) {
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2018-01-16 17:56:46 +08:00
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int regs[4];
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__cpuidex(regs, func, subfunc);
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cpuinfo.eax = regs[0];
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cpuinfo.ebx = regs[1];
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cpuinfo.ecx = regs[2];
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cpuinfo.edx = regs[3];
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2018-01-16 14:44:06 +08:00
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}
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#else
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static void __zend_cpuid(uint32_t func, uint32_t subfunc) {
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cpuinfo.eax = 0;
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}
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#endif
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ZEND_API int zend_cpu_supports(zend_cpu_feature feature) {
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if (!cpuinfo.initialized) {
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cpuinfo.initialized = 1;
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__zend_cpuid(0, 0);
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if (cpuinfo.eax == 0) {
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return 0;
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}
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__zend_cpuid(1, 0);
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}
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if (feature & ZEND_CPU_EDX_MASK) {
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return (cpuinfo.edx & (feature & ~ZEND_CPU_EDX_MASK));
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} else {
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return (cpuinfo.ecx & feature);
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}
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}
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/*
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* indent-tabs-mode: t
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* End:
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*/
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