mirror of
https://gitea.wildfiregames.com/0ad/0ad.git
synced 2026-11-08 10:29:00 +00:00
Vladislav Belov
72e12ddd6a
Removed: * os_cpu_QueryMemorySize * os_cpu_MemorySize * GetCapBits * rdtsc * CONFIG2_TIMER_ALLOW_RDTSC
88 lines
2.8 KiB
C++
88 lines
2.8 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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* OS-specific support functions relating to CPU and memory
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*/
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#ifndef INCLUDED_OS_CPU
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#define INCLUDED_OS_CPU
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#include "lib/status.h"
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#include <climits>
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#include <cstddef>
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#include <cstdint>
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//-----------------------------------------------------------------------------
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// processor topology
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// processor ID = [0, os_cpu_NumProcessors())
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// they are a numbering of the bits of the process affinity mask where the
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// least significant nonzero bit corresponds to ID 0.
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// rationale: this spares users from having to deal with noncontiguous IDs,
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// e.g. when administrative tools are used to restrict process affinity.
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/**
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* maximum number of processors supported by the OS (determined by the
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* number of bits in an affinity mask)
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**/
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static const size_t os_cpu_MaxProcessors = sizeof(uintptr_t)*CHAR_BIT;
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/**
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* @return bit mask of processors that exist and are available to
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* this process.
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* its population count is by definition equal to os_cpu_NumProcessors().
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**/
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uintptr_t os_cpu_ProcessorMask();
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/**
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* @return the number of processors available to this process.
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*
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* note: this function is necessary because POSIX sysconf _SC_NPROCESSORS_CONF
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* is not suppored on MacOSX, else we would use that.
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**/
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size_t os_cpu_NumProcessors();
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//-----------------------------------------------------------------------------
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// CPU and memory characteristics
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/**
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* @return the size [bytes] of a MMU page (4096 on most IA-32 systems)
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**/
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size_t os_cpu_PageSize();
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/**
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* @return the size [bytes] of a large MMU page (4 MiB on most IA-32 systems)
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* or zero if they are not supported.
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**/
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size_t os_cpu_LargePageSize();
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/**
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* @return the current amount [MB] of available memory.
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**/
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size_t os_cpu_MemoryAvailable();
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#endif // #ifndef INCLUDED_OS_CPU
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