82 lines
2.2 KiB
C++
82 lines
2.2 KiB
C++
// Copyright (C) 2023 Alexandre Janniaux
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// This file is part of the "Nazara Engine - Core module"
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// For conditions of distribution and use, see copyright notice in Config.hpp
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#include <Nazara/Core/Posix/HardwareInfoImpl.hpp>
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#include <Nazara/Core/Error.hpp>
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#include <unistd.h>
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#include <Nazara/Core/Debug.hpp>
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namespace Nz
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{
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void HardwareInfoImpl::Cpuid(UInt32 functionId, UInt32 subFunctionId, UInt32 registers[4])
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{
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#if (defined(NAZARA_COMPILER_CLANG) || defined(NAZARA_COMPILER_GCC) || defined(NAZARA_COMPILER_INTEL)) && !defined(NAZARA_PLATFORM_WEB)
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// https://en.wikipedia.org/wiki/CPUID
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asm volatile(
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#ifdef NAZARA_PLATFORM_x64
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"pushq %%rbx \n\t" // save %rbx
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#else
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"pushl %%ebx \n\t" // save %ebx
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#endif
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"cpuid \n\t"
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"movl %%ebx ,%[ebx] \n\t" // write the result into output var
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#ifdef NAZARA_PLATFORM_x64
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"popq %%rbx \n\t"
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#else
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"popl %%ebx \n\t"
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#endif
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: "=a"(registers[0]), [ebx] "=r"(registers[1]), "=c"(registers[2]), "=d"(registers[3])
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: "a"(functionId), "c" (subFunctionId));
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#else
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NazaraInternalError("Cpuid has been called although it is not supported");
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#endif
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}
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unsigned int HardwareInfoImpl::GetProcessorCount()
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{
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// Simpler (and more portable) than using CPUID
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return sysconf(_SC_NPROCESSORS_CONF);
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}
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UInt64 HardwareInfoImpl::GetTotalMemory()
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{
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UInt64 pages = sysconf(_SC_PHYS_PAGES);
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UInt64 page_size = sysconf(_SC_PAGE_SIZE);
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return pages * page_size;
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}
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bool HardwareInfoImpl::IsCpuidSupported()
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{
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#ifdef NAZARA_PLATFORM_x64
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return true; // cpuid is always supported on x64 arch
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#elif defined(NAZARA_PLATFORM_WEB)
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return false;
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#else
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#if defined(NAZARA_COMPILER_CLANG) || defined(NAZARA_COMPILER_GCC) || defined(NAZARA_COMPILER_INTEL)
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int supported;
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asm volatile (" pushfl\n"
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" pop %%eax\n"
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" mov %%eax, %%ecx\n"
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" xor $0x200000, %%eax\n"
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" push %%eax\n"
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" popfl\n"
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" pushfl\n"
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" pop %%eax\n"
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" xor %%ecx, %%eax\n"
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" mov %%eax, %0\n"
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" push %%ecx\n"
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" popfl"
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: "=m" (supported) // output
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: // input
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: "eax", "ecx", "memory"); // clobbered register
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return supported != 0;
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#else
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return false;
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#endif
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#endif
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}
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}
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