os_cpu.cpp

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/* Copyright (c) 2010 Wildfire Games
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

/*
 * OS-specific support functions relating to CPU and memory
 */

#include "precompiled.h"
#include "lib/sysdep/os_cpu.h"

#include "lib/alignment.h"
#include "lib/sysdep/smbios.h"

#if OS_WIN
# include "lib/sysdep/os/win/wcpu.h"
#endif

static const StatusDefinition osCpuStatusDefinitions[] = {
    { ERR::OS_CPU_RESTRICTED_AFFINITY, L"Cannot set desired CPU affinity" }
};
STATUS_ADD_DEFINITIONS(osCpuStatusDefinitions);


double os_cpu_ClockFrequency()
{
    static double clockFrequency;
    if(clockFrequency != 0.0)   // already initialized
        return clockFrequency;

#if OS_WIN
    u32 freqMhz;
    if(wcpu_ReadFrequencyFromRegistry(freqMhz) == INFO::OK)
        return clockFrequency = freqMhz * 1e6;
#endif

    const SMBIOS::Structures* structures = SMBIOS::GetStructures();
    if(structures->Processor_)
        return clockFrequency = structures->Processor_->maxFrequency * 1e6;

    return clockFrequency = -1.0;   // unknown
}


size_t os_cpu_MemorySize()
{
    static size_t memorySize;
    if(memorySize != 0) // already initialized
        return memorySize;

    memorySize = os_cpu_QueryMemorySize();

    // replace with the sum of all memory devices reported by SMBIOS if
    // that's within 10% of what the OS reported
    {
        const SMBIOS::Structures* structures = SMBIOS::GetStructures();
        u64 memorySizeBytes = 0;
        for(const SMBIOS::MemoryDevice* p = structures->MemoryDevice_; p; p = p->next)
            memorySizeBytes += p->size;
        const size_t memorySize2 = memorySizeBytes/MiB;
        if(9*memorySize/10 <= memorySize2 && memorySize2 <= 11*memorySize/10)
            memorySize = memorySize2;
    }

    return memorySize;
}