File size: 2,998 Bytes
034d0a2 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 | // Copyright 2013 Dolphin Emulator Project / 2022 Citra Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include "common/arch.h"
#if CITRA_ARCH(arm64)
#include <cstring>
#include <fstream>
#include <string>
#ifdef __APPLE__
// clang-format off
#include <sys/types.h>
#include <sys/sysctl.h>
// clang-format on
#elif !defined(_WIN32)
#ifndef __FreeBSD__
#include <asm/hwcap.h>
#endif // __FreeBSD__
#include <sys/auxv.h>
#include <unistd.h>
#endif // __APPLE__
#include "common/aarch64/cpu_detect.h"
#include "common/file_util.h"
namespace Common {
#ifdef __APPLE__
static std::string GetCPUString() {
char buf[128];
std::size_t buf_len = sizeof(buf);
if (sysctlbyname("machdep.cpu.brand_string", &buf, &buf_len, NULL, 0) == -1) {
return "Unknown";
}
return buf;
}
#elif !defined(WIN32)
static std::string GetCPUString() {
constexpr char procfile[] = "/proc/cpuinfo";
constexpr char marker[] = "Hardware\t: ";
std::string cpu_string = "Unknown";
std::string line;
std::ifstream file;
OpenFStream(file, procfile, std::ios_base::in);
if (!file)
return cpu_string;
while (std::getline(file, line)) {
if (line.find(marker) != std::string::npos) {
cpu_string = line.substr(strlen(marker));
break;
}
}
return cpu_string;
}
#endif // __APPLE__
// Detects the various CPU features
static CPUCaps Detect() {
CPUCaps caps;
// Set some defaults here
caps.fma = true;
caps.afp = false;
#ifdef __APPLE__
// M-series CPUs have all of these
caps.fp = true;
caps.asimd = true;
caps.aes = true;
caps.crc32 = true;
caps.sha1 = true;
caps.sha2 = true;
caps.cpu_string = GetCPUString();
#elif defined(_WIN32)
// Windows does not provide any mechanism for querying the system registers on ARMv8, unlike
// Linux which traps the register reads and emulates them in the kernel. There are environment
// variables containing some of the CPU-specific values, which we could use for a lookup table
// in the future. For now, assume all features are present as all known devices which are
// Windows-on-ARM compatible also support these extensions.
caps.fp = true;
caps.asimd = true;
caps.aes = true;
caps.crc32 = true;
caps.sha1 = true;
caps.sha2 = true;
#else
caps.cpu_string = GetCPUString();
#ifdef __FreeBSD__
u_long hwcaps = 0;
elf_aux_info(AT_HWCAP, &hwcaps, sizeof(u_long));
#else
unsigned long hwcaps = getauxval(AT_HWCAP);
#endif // __FreeBSD__
caps.fp = hwcaps & HWCAP_FP;
caps.asimd = hwcaps & HWCAP_ASIMD;
caps.aes = hwcaps & HWCAP_AES;
caps.crc32 = hwcaps & HWCAP_CRC32;
caps.sha1 = hwcaps & HWCAP_SHA1;
caps.sha2 = hwcaps & HWCAP_SHA2;
#endif // __APPLE__
return caps;
}
const CPUCaps& GetCPUCaps() {
static CPUCaps caps = Detect();
return caps;
}
} // namespace Common
#endif // CITRA_ARCH(arm64)
|