1 /*
2 +----------------------------------------------------------------------+
3 | Zend Engine |
4 +----------------------------------------------------------------------+
5 | Copyright (c) 2018-2018 Zend Technologies Ltd. (http://www.zend.com) |
6 +----------------------------------------------------------------------+
7 | This source file is subject to version 2.00 of the Zend license, |
8 | that is bundled with this package in the file LICENSE, and is |
9 | available through the world-wide-web at the following url: |
10 | http://www.zend.com/license/2_00.txt. |
11 | If you did not receive a copy of the Zend license and are unable to |
12 | obtain it through the world-wide-web, please send a note to |
13 | license@zend.com so we can mail you a copy immediately. |
14 +----------------------------------------------------------------------+
15 | Authors: Xinchen Hui <xinchen.h@zend.com> |
16 +----------------------------------------------------------------------+
17 */
18
19 #include "zend_cpuinfo.h"
20
21 typedef struct _zend_cpu_info {
22 uint32_t eax;
23 uint32_t ebx;
24 uint32_t ecx;
25 uint32_t edx;
26 uint32_t initialized;
27 } zend_cpu_info;
28
29 static zend_cpu_info cpuinfo = {0};
30
31 #if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
32 # if defined(HAVE_CPUID_H) && defined(HAVE_CPUID_COUNT)
33 # include <cpuid.h>
__zend_cpuid(uint32_t func,uint32_t subfunc,zend_cpu_info * cpuinfo)34 static void __zend_cpuid(uint32_t func, uint32_t subfunc, zend_cpu_info *cpuinfo) {
35 __cpuid_count(func, subfunc, cpuinfo->eax, cpuinfo->ebx, cpuinfo->ecx, cpuinfo->edx);
36 }
37 # else
__zend_cpuid(uint32_t func,uint32_t subfunc,zend_cpu_info * cpuinfo)38 static void __zend_cpuid(uint32_t func, uint32_t subfunc, zend_cpu_info *cpuinfo) {
39 #if defined(__i386__) && (defined(__pic__) || defined(__PIC__))
40 /* PIC on i386 uses %ebx, so preserve it. */
41 __asm__ __volatile__ (
42 "pushl %%ebx\n"
43 "cpuid\n"
44 "mov %%ebx,%1\n"
45 "popl %%ebx"
46 : "=a"(cpuinfo->eax), "=r"(cpuinfo->ebx), "=c"(cpuinfo->ecx), "=d"(cpuinfo->edx)
47 : "a"(func), "c"(subfunc)
48 );
49 #else
50 __asm__ __volatile__ (
51 "cpuid"
52 : "=a"(cpuinfo->eax), "=b"(cpuinfo->ebx), "=c"(cpuinfo->ecx), "=d"(cpuinfo->edx)
53 : "a"(func), "c"(subfunc)
54 );
55 #endif
56 }
57 # endif
58 #elif defined(ZEND_WIN32) && !defined(__clang__)
59 # include <intrin.h>
__zend_cpuid(uint32_t func,uint32_t subfunc,zend_cpu_info * cpuinfo)60 static void __zend_cpuid(uint32_t func, uint32_t subfunc, zend_cpu_info *cpuinfo) {
61 int regs[4];
62
63 __cpuidex(regs, func, subfunc);
64
65 cpuinfo->eax = regs[0];
66 cpuinfo->ebx = regs[1];
67 cpuinfo->ecx = regs[2];
68 cpuinfo->edx = regs[3];
69 }
70 #else
__zend_cpuid(uint32_t func,uint32_t subfunc,zend_cpu_info * cpuinfo)71 static void __zend_cpuid(uint32_t func, uint32_t subfunc, zend_cpu_info *cpuinfo) {
72 cpuinfo->eax = 0;
73 }
74 #endif
75
zend_cpu_startup(void)76 void zend_cpu_startup(void)
77 {
78 if (!cpuinfo.initialized) {
79 zend_cpu_info ebx;
80 int max_feature;
81
82 cpuinfo.initialized = 1;
83 __zend_cpuid(0, 0, &cpuinfo);
84 max_feature = cpuinfo.eax;
85 if (max_feature == 0) {
86 return;
87 }
88
89 __zend_cpuid(1, 0, &cpuinfo);
90
91 /* for avx2 */
92 if (max_feature >= 7) {
93 __zend_cpuid(7, 0, &ebx);
94 cpuinfo.ebx = ebx.ebx;
95 } else {
96 cpuinfo.ebx = 0;
97 }
98 }
99 }
100
zend_cpu_supports(zend_cpu_feature feature)101 ZEND_API int zend_cpu_supports(zend_cpu_feature feature) {
102 if (feature & ZEND_CPU_EDX_MASK) {
103 return (cpuinfo.edx & (feature & ~ZEND_CPU_EDX_MASK));
104 } else if (feature & ZEND_CPU_EBX_MASK) {
105 return (cpuinfo.ebx & (feature & ~ZEND_CPU_EBX_MASK));
106 } else {
107 return (cpuinfo.ecx & feature);
108 }
109 }
110
111 /*
112 * Local variables:
113 * tab-width: 4
114 * c-basic-offset: 4
115 * indent-tabs-mode: t
116 * End:
117 */
118
