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