mirror of
https://gitea.wildfiregames.com/0ad/0ad.git
synced 2026-11-08 10:29:00 +00:00
141 lines
3.8 KiB
C++
141 lines
3.8 KiB
C++
/* Copyright (C) 2026 Wildfire Games.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/*
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* Windows implementation of sysdep/cpu
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*/
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#include "precompiled.h"
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#include "lib/sysdep/os_cpu.h"
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#include "lib/bits.h"
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#include "lib/alignment.h"
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#include "lib/module_init.h"
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#include "lib/sysdep/os/win/wutil.h"
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#include "lib/sysdep/arch/x86_x64/x86_x64.h"
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#include <bit>
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uintptr_t os_cpu_ProcessorMask()
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{
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static uintptr_t processorMask;
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if(!processorMask)
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{
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const HANDLE hProcess = GetCurrentProcess();
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DWORD_PTR processAffinity, systemAffinity;
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const BOOL ok = GetProcessAffinityMask(hProcess, &processAffinity, &systemAffinity);
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ENSURE(ok);
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ENSURE(processAffinity != 0);
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processorMask = processAffinity;
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}
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return processorMask;
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}
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size_t os_cpu_NumProcessors()
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{
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static size_t numProcessors;
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if(!numProcessors)
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{
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numProcessors = std::popcount(os_cpu_ProcessorMask());
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// sanity check
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SYSTEM_INFO si;
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GetSystemInfo(&si); // guaranteed to succeed
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ENSURE(numProcessors <= (size_t)si.dwNumberOfProcessors);
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ENSURE(numProcessors >= 1);
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}
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return numProcessors;
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}
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size_t os_cpu_PageSize()
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{
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static size_t systemPageSize;
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if(!systemPageSize)
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{
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SYSTEM_INFO si;
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GetSystemInfo(&si); // guaranteed to succeed
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systemPageSize = (size_t)si.dwPageSize;
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}
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return systemPageSize;
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}
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size_t os_cpu_LargePageSize()
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{
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static size_t largePageSize = ~(size_t)0; // "0" has special significance
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if(largePageSize == ~(size_t)0)
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{
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largePageSize = GetLargePageMinimum();
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// Note: checks disabled due to failing on Vista SP2 with old Xeon CPU
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// see https://gitea.wildfiregames.com/0ad/0ad/issues/2346
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//ENSURE(largePageSize != 0); // IA-32 and AMD64 definitely support large pages
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//ENSURE(largePageSize > os_cpu_PageSize());
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}
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return largePageSize;
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}
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static void GetMemoryStatus(MEMORYSTATUSEX& mse)
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{
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// note: we no longer bother dynamically importing GlobalMemoryStatusEx -
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// it's available on Win2k and above. this function safely handles
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// systems with > 4 GB of memory.
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mse.dwLength = sizeof(mse);
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const BOOL ok = GlobalMemoryStatusEx(&mse);
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WARN_IF_FALSE(ok);
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}
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size_t os_cpu_QueryMemorySize()
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{
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MEMORYSTATUSEX mse;
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GetMemoryStatus(mse);
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DWORDLONG memorySize = mse.ullTotalPhys;
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// Richter, "Programming Applications for Windows": the reported
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// value doesn't include non-paged pool reserved during boot;
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// it's not considered available to the kernel. (the amount is
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// 528 KiB on a 512 MiB WinXP/Win2k machine). we'll round up
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// to the nearest megabyte to fix this.
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memorySize = round_up(memorySize, DWORDLONG(1*MiB)); // (Align<> cannot compute DWORDLONG)
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return size_t(memorySize / MiB);
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}
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size_t os_cpu_MemoryAvailable()
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{
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MEMORYSTATUSEX mse;
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GetMemoryStatus(mse);
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const size_t memoryAvailableMiB = size_t(mse.ullAvailPhys / MiB);
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return memoryAvailableMiB;
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}
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