1/*
2 * Copyright 2016 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#include "include/core/SkStream.h"
9#include "include/core/SkString.h"
10#include "include/private/SkOnce.h"
11#include "src/core/SkCpu.h"
12
13#if defined(SK_CPU_X86)
14 #if defined(_MSC_VER)
15 #include <intrin.h>
16 static void cpuid (uint32_t abcd[4]) { __cpuid ((int*)abcd, 1); }
17 static void cpuid7(uint32_t abcd[4]) { __cpuidex((int*)abcd, 7, 0); }
18 static uint64_t xgetbv(uint32_t xcr) { return _xgetbv(xcr); }
19 #else
20 #include <cpuid.h>
21 #if !defined(__cpuid_count) // Old Mac Clang doesn't have this defined.
22 #define __cpuid_count(eax, ecx, a, b, c, d) \
23 __asm__("cpuid" : "=a"(a), "=b"(b), "=c"(c), "=d"(d) : "0"(eax), "2"(ecx))
24 #endif
25 static void cpuid (uint32_t abcd[4]) { __get_cpuid(1, abcd+0, abcd+1, abcd+2, abcd+3); }
26 static void cpuid7(uint32_t abcd[4]) {
27 __cpuid_count(7, 0, abcd[0], abcd[1], abcd[2], abcd[3]);
28 }
29 static uint64_t xgetbv(uint32_t xcr) {
30 uint32_t eax, edx;
31 __asm__ __volatile__ ( "xgetbv" : "=a"(eax), "=d"(edx) : "c"(xcr));
32 return (uint64_t)(edx) << 32 | eax;
33 }
34 #endif
35
36 static uint32_t read_cpu_features() {
37 uint32_t features = 0;
38 uint32_t abcd[4] = {0,0,0,0};
39
40 // You might want to refer to http://www.sandpile.org/x86/cpuid.htm
41
42 cpuid(abcd);
43 if (abcd[3] & (1<<25)) { features |= SkCpu:: SSE1; }
44 if (abcd[3] & (1<<26)) { features |= SkCpu:: SSE2; }
45 if (abcd[2] & (1<< 0)) { features |= SkCpu:: SSE3; }
46 if (abcd[2] & (1<< 9)) { features |= SkCpu::SSSE3; }
47 if (abcd[2] & (1<<19)) { features |= SkCpu::SSE41; }
48 if (abcd[2] & (1<<20)) { features |= SkCpu::SSE42; }
49
50 if ((abcd[2] & (3<<26)) == (3<<26) // XSAVE + OSXSAVE
51 && (xgetbv(0) & (3<<1)) == (3<<1)) { // XMM and YMM state enabled.
52 if (abcd[2] & (1<<28)) { features |= SkCpu:: AVX; }
53 if (abcd[2] & (1<<29)) { features |= SkCpu::F16C; }
54 if (abcd[2] & (1<<12)) { features |= SkCpu:: FMA; }
55
56 cpuid7(abcd);
57 if (abcd[1] & (1<<5)) { features |= SkCpu::AVX2; }
58 if (abcd[1] & (1<<3)) { features |= SkCpu::BMI1; }
59 if (abcd[1] & (1<<8)) { features |= SkCpu::BMI2; }
60
61 if ((xgetbv(0) & (7<<5)) == (7<<5)) { // All ZMM state bits enabled too.
62 if (abcd[1] & (1<<16)) { features |= SkCpu::AVX512F; }
63 if (abcd[1] & (1<<17)) { features |= SkCpu::AVX512DQ; }
64 if (abcd[1] & (1<<21)) { features |= SkCpu::AVX512IFMA; }
65 if (abcd[1] & (1<<26)) { features |= SkCpu::AVX512PF; }
66 if (abcd[1] & (1<<27)) { features |= SkCpu::AVX512ER; }
67 if (abcd[1] & (1<<28)) { features |= SkCpu::AVX512CD; }
68 if (abcd[1] & (1<<30)) { features |= SkCpu::AVX512BW; }
69 if (abcd[1] & (1<<31)) { features |= SkCpu::AVX512VL; }
70 }
71 }
72 return features;
73 }
74
75#elif defined(SK_CPU_ARM64) && __has_include(<sys/auxv.h>)
76 #include <sys/auxv.h>
77
78 static uint32_t read_cpu_features() {
79 const uint32_t kHWCAP_CRC32 = (1<< 7),
80 kHWCAP_ASIMDHP = (1<<10);
81
82 uint32_t features = 0;
83 uint32_t hwcaps = getauxval(AT_HWCAP);
84 if (hwcaps & kHWCAP_CRC32 ) { features |= SkCpu::CRC32; }
85 if (hwcaps & kHWCAP_ASIMDHP) { features |= SkCpu::ASIMDHP; }
86
87 // The Samsung Mongoose 3 core sets the ASIMDHP bit but doesn't support it.
88 for (int core = 0; features & SkCpu::ASIMDHP; core++) {
89 // These /sys files contain the core's MIDR_EL1 register, the source of
90 // CPU {implementer, variant, part, revision} you'd see in /proc/cpuinfo.
91 SkString path =
92 SkStringPrintf("/sys/devices/system/cpu/cpu%d/regs/identification/midr_el1", core);
93
94 // Can't use SkData::MakeFromFileName() here, I think because /sys can't be mmap()'d.
95 SkFILEStream midr_el1(path.c_str());
96 if (!midr_el1.isValid()) {
97 // This is our ordinary exit path.
98 // If we ask for MIDR_EL1 from a core that doesn't exist, we've checked all cores.
99 if (core == 0) {
100 // On the other hand, if we can't read MIDR_EL1 from any core, assume the worst.
101 features &= ~(SkCpu::ASIMDHP);
102 }
103 break;
104 }
105
106 const char kMongoose3[] = "0x00000000531f0020"; // 53 == Samsung.
107 char buf[SK_ARRAY_COUNT(kMongoose3) - 1]; // No need for the terminating \0.
108
109 if (SK_ARRAY_COUNT(buf) != midr_el1.read(buf, SK_ARRAY_COUNT(buf))
110 || 0 == memcmp(kMongoose3, buf, SK_ARRAY_COUNT(buf))) {
111 features &= ~(SkCpu::ASIMDHP);
112 }
113 }
114 return features;
115 }
116
117#elif defined(SK_CPU_ARM32) && __has_include(<sys/auxv.h>) && \
118 (!defined(__ANDROID_API__) || __ANDROID_API__ >= 18)
119 // sys/auxv.h will always be present in the Android NDK due to unified
120 //headers, but getauxval is only defined for API >= 18.
121 #include <sys/auxv.h>
122
123 static uint32_t read_cpu_features() {
124 const uint32_t kHWCAP_NEON = (1<<12);
125 const uint32_t kHWCAP_VFPv4 = (1<<16);
126
127 uint32_t features = 0;
128 uint32_t hwcaps = getauxval(AT_HWCAP);
129 if (hwcaps & kHWCAP_NEON ) {
130 features |= SkCpu::NEON;
131 if (hwcaps & kHWCAP_VFPv4) { features |= SkCpu::NEON_FMA|SkCpu::VFP_FP16; }
132 }
133 return features;
134 }
135
136#elif defined(SK_CPU_ARM32) && __has_include(<cpu-features.h>)
137 #include <cpu-features.h>
138
139 static uint32_t read_cpu_features() {
140 uint32_t features = 0;
141 uint64_t cpu_features = android_getCpuFeatures();
142 if (cpu_features & ANDROID_CPU_ARM_FEATURE_NEON) { features |= SkCpu::NEON; }
143 if (cpu_features & ANDROID_CPU_ARM_FEATURE_NEON_FMA) { features |= SkCpu::NEON_FMA; }
144 if (cpu_features & ANDROID_CPU_ARM_FEATURE_VFP_FP16) { features |= SkCpu::VFP_FP16; }
145 return features;
146 }
147
148#else
149 static uint32_t read_cpu_features() {
150 return 0;
151 }
152
153#endif
154
155uint32_t SkCpu::gCachedFeatures = 0;
156
157void SkCpu::CacheRuntimeFeatures() {
158 static SkOnce once;
159 once([] { gCachedFeatures = read_cpu_features(); });
160}
161