ref: 97c9ffc45c1e583527ab4425a3f6a2cb4eb778b1
dir: /codec/common/src/cpu.cpp/
/*!
* \copy
* Copyright (c) 2009-2013, Cisco Systems
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*
* \file cpu.cpp
*
* \brief CPU compatibility detection
*
* \date 04/29/2009 Created
*
*************************************************************************************
*/
#include <string.h>
#include <stdio.h>
#ifdef ANDROID_NDK
#include <cpu-features.h>
#endif
#include "cpu.h"
#include "cpu_core.h"
#define CPU_Vendor_AMD "AuthenticAMD"
#define CPU_Vendor_INTEL "GenuineIntel"
#define CPU_Vendor_CYRIX "CyrixInstead"
#if defined(X86_ASM)
uint32_t WelsCPUFeatureDetect (int32_t* pNumberOfLogicProcessors) {
uint32_t uiCPU = 0;
uint32_t uiFeatureA = 0, uiFeatureB = 0, uiFeatureC = 0, uiFeatureD = 0;
int32_t CacheLineSize = 0;
int8_t chVendorName[16] = { 0 };
uint32_t uiMaxCpuidLevel = 0;
if (!WelsCPUIdVerify()) {
/* cpuid is not supported in cpu */
return 0;
}
WelsCPUId (0, &uiFeatureA, (uint32_t*)&chVendorName[0], (uint32_t*)&chVendorName[8], (uint32_t*)&chVendorName[4]);
uiMaxCpuidLevel = uiFeatureA;
if (uiMaxCpuidLevel == 0) {
/* maximum input value for basic cpuid information */
return 0;
}
WelsCPUId (1, &uiFeatureA, &uiFeatureB, &uiFeatureC, &uiFeatureD);
if ((uiFeatureD & 0x00800000) == 0) {
/* Basic MMX technology is not support in cpu, mean nothing for us so return here */
return 0;
}
uiCPU = WELS_CPU_MMX;
if (uiFeatureD & 0x02000000) {
/* SSE technology is identical to AMD MMX extensions */
uiCPU |= WELS_CPU_MMXEXT | WELS_CPU_SSE;
}
if (uiFeatureD & 0x04000000) {
/* SSE2 support here */
uiCPU |= WELS_CPU_SSE2;
}
if (uiFeatureD & 0x00000001) {
/* x87 FPU on-chip checking */
uiCPU |= WELS_CPU_FPU;
}
if (uiFeatureD & 0x00008000) {
/* CMOV instruction checking */
uiCPU |= WELS_CPU_CMOV;
}
if ((!strcmp ((const char*)chVendorName, CPU_Vendor_INTEL)) ||
(!strcmp ((const char*)chVendorName, CPU_Vendor_AMD))) { // confirmed_safe_unsafe_usage
if (uiFeatureD & 0x10000000) {
/* Multi-Threading checking: contains of multiple logic processors */
uiCPU |= WELS_CPU_HTT;
}
}
if (uiFeatureC & 0x00000001) {
/* SSE3 support here */
uiCPU |= WELS_CPU_SSE3;
}
if (uiFeatureC & 0x00000200) {
/* SSSE3 support here */
uiCPU |= WELS_CPU_SSSE3;
}
if (uiFeatureC & 0x00080000) {
/* SSE4.1 support here, 45nm Penryn processor */
uiCPU |= WELS_CPU_SSE41;
}
if (uiFeatureC & 0x00100000) {
/* SSE4.2 support here, next generation Nehalem processor */
uiCPU |= WELS_CPU_SSE42;
}
if (WelsCPUSupportAVX (uiFeatureA, uiFeatureC)) {
/* AVX supported */
uiCPU |= WELS_CPU_AVX;
}
if (WelsCPUSupportFMA (uiFeatureA, uiFeatureC)) {
/* AVX FMA supported */
uiCPU |= WELS_CPU_FMA;
}
if (uiFeatureC & 0x02000000) {
/* AES checking */
uiCPU |= WELS_CPU_AES;
}
if (uiFeatureC & 0x00400000) {
/* MOVBE checking */
uiCPU |= WELS_CPU_MOVBE;
}
if (uiMaxCpuidLevel >= 7) {
uiFeatureC = 0;
WelsCPUId (7, &uiFeatureA, &uiFeatureB, &uiFeatureC, &uiFeatureD);
if ((uiCPU & WELS_CPU_AVX) && (uiFeatureB & 0x00000020)) {
/* AVX2 supported */
uiCPU |= WELS_CPU_AVX2;
}
}
if (pNumberOfLogicProcessors != NULL) {
if (uiCPU & WELS_CPU_HTT) {
*pNumberOfLogicProcessors = (uiFeatureB & 0x00ff0000) >> 16; // feature bits: 23-16 on returned EBX
} else {
*pNumberOfLogicProcessors = 0;
}
if (!strcmp ((const char*)chVendorName, CPU_Vendor_INTEL)) {
if (uiMaxCpuidLevel >= 4) {
uiFeatureC = 0;
WelsCPUId (0x4, &uiFeatureA, &uiFeatureB, &uiFeatureC, &uiFeatureD);
if (uiFeatureA != 0) {
*pNumberOfLogicProcessors = ((uiFeatureA & 0xfc000000) >> 26) + 1;
}
}
}
}
WelsCPUId (0x80000000, &uiFeatureA, &uiFeatureB, &uiFeatureC, &uiFeatureD);
if ((!strcmp ((const char*)chVendorName, CPU_Vendor_AMD))
&& (uiFeatureA >= 0x80000001)) { // confirmed_safe_unsafe_usage
WelsCPUId (0x80000001, &uiFeatureA, &uiFeatureB, &uiFeatureC, &uiFeatureD);
if (uiFeatureD & 0x00400000) {
uiCPU |= WELS_CPU_MMXEXT;
}
if (uiFeatureD & 0x80000000) {
uiCPU |= WELS_CPU_3DNOW;
}
}
if (!strcmp ((const char*)chVendorName, CPU_Vendor_INTEL)) { // confirmed_safe_unsafe_usage
int32_t family, model;
WelsCPUId (1, &uiFeatureA, &uiFeatureB, &uiFeatureC, &uiFeatureD);
family = ((uiFeatureA >> 8) & 0xf) + ((uiFeatureA >> 20) & 0xff);
model = ((uiFeatureA >> 4) & 0xf) + ((uiFeatureA >> 12) & 0xf0);
if ((family == 6) && (model == 9 || model == 13 || model == 14)) {
uiCPU &= ~ (WELS_CPU_SSE2 | WELS_CPU_SSE3);
}
}
// get cache line size
if ((!strcmp ((const char*)chVendorName, CPU_Vendor_INTEL))
|| ! (strcmp ((const char*)chVendorName, CPU_Vendor_CYRIX))) { // confirmed_safe_unsafe_usage
WelsCPUId (1, &uiFeatureA, &uiFeatureB, &uiFeatureC, &uiFeatureD);
CacheLineSize = (uiFeatureB & 0xff00) >>
5; // ((clflush_line_size >> 8) << 3), CLFLUSH_line_size * 8 = CacheLineSize_in_byte
if (CacheLineSize == 128) {
uiCPU |= WELS_CPU_CACHELINE_128;
} else if (CacheLineSize == 64) {
uiCPU |= WELS_CPU_CACHELINE_64;
} else if (CacheLineSize == 32) {
uiCPU |= WELS_CPU_CACHELINE_32;
} else if (CacheLineSize == 16) {
uiCPU |= WELS_CPU_CACHELINE_16;
}
}
return uiCPU;
}
void WelsCPURestore (const uint32_t kuiCPU) {
if (kuiCPU & (WELS_CPU_MMX | WELS_CPU_MMXEXT | WELS_CPU_3DNOW | WELS_CPU_3DNOWEXT)) {
WelsEmms();
}
}
#elif defined(HAVE_NEON) //For supporting both android platform and iOS platform
#if defined(ANDROID_NDK)
uint32_t WelsCPUFeatureDetect (int32_t* pNumberOfLogicProcessors) {
uint32_t uiCPU = 0;
AndroidCpuFamily cpuFamily = ANDROID_CPU_FAMILY_UNKNOWN;
uint64_t uiFeatures = 0;
cpuFamily = android_getCpuFamily();
if (cpuFamily == ANDROID_CPU_FAMILY_ARM) {
uiFeatures = android_getCpuFeatures();
if (uiFeatures & ANDROID_CPU_ARM_FEATURE_ARMv7) {
uiCPU |= WELS_CPU_ARMv7;
}
if (uiFeatures & ANDROID_CPU_ARM_FEATURE_VFPv3) {
uiCPU |= WELS_CPU_VFPv3;
}
if (uiFeatures & ANDROID_CPU_ARM_FEATURE_NEON) {
uiCPU |= WELS_CPU_NEON;
}
}
if (pNumberOfLogicProcessors != NULL) {
*pNumberOfLogicProcessors = android_getCpuCount();
}
return uiCPU;
}
#elif defined(__APPLE__)
uint32_t WelsCPUFeatureDetect (int32_t* pNumberOfLogicProcessors) {
uint32_t uiCPU = 0;
#if defined(__ARM_NEON__)
uiCPU |= WELS_CPU_ARMv7;
uiCPU |= WELS_CPU_VFPv3;
uiCPU |= WELS_CPU_NEON;
#endif
return uiCPU;
}
#elif defined(__linux__)
/* Generic arm/linux cpu feature detection */
uint32_t WelsCPUFeatureDetect (int32_t* pNumberOfLogicProcessors) {
FILE* f = fopen ("/proc/cpuinfo", "r");
if (!f)
return 0;
char buf[200];
int flags = 0;
while (fgets (buf, sizeof (buf), f)) {
if (!strncmp (buf, "Features", strlen ("Features"))) {
// The asimd and fp features are listed on 64 bit ARMv8 kernels
if (strstr (buf, " neon ") || strstr (buf, " asimd "))
flags |= WELS_CPU_NEON;
if (strstr (buf, " vfpv3 ") || strstr (buf, " fp "))
flags |= WELS_CPU_VFPv3;
break;
}
}
fclose (f);
return flags;
}
#else /* HAVE_NEON enabled but no runtime detection */
/* No runtime feature detection available, but built with HAVE_NEON - assume
* that NEON and all associated features are available. */
uint32_t WelsCPUFeatureDetect (int32_t* pNumberOfLogicProcessors) {
return WELS_CPU_ARMv7 |
WELS_CPU_VFPv3 |
WELS_CPU_NEON;
}
#endif
#elif defined(HAVE_NEON_AARCH64)
/* For AArch64, no runtime detection actually is necessary for now, since
* NEON and VFPv3 is mandatory on all such CPUs. (/proc/cpuinfo doesn't
* contain neon, and the android cpufeatures library doesn't return it
* either.) */
uint32_t WelsCPUFeatureDetect (int32_t* pNumberOfLogicProcessors) {
return WELS_CPU_VFPv3 |
WELS_CPU_NEON;
}
#else /* Neither X86_ASM, HAVE_NEON nor HAVE_NEON_AARCH64 */
uint32_t WelsCPUFeatureDetect (int32_t* pNumberOfLogicProcessors) {
return 0;
}
#endif