/***
    Copyright (C) 2022 J Reece Wilson (a/k/a "Reece"). All rights reserved.

    File: CpuId.Linux.cpp
    Date: 2022-1-25
    Author: Reece
***/
#include <Source/RuntimeInternal.hpp>
#include "HWInfo.hpp"
#include "CpuInfo.hpp"
#include "CpuInfo.Linux.hpp"

#if defined(AURORA_IS_BSD_DERIVED)
    #include <sys/types.h>
    #include <sys/sysctl.h>
#endif

#if defined(AURORA_IS_POSIX_DERIVED)
    #include <stdlib.h>
    #include <sys/sysinfo.h>
#endif

namespace Aurora::HWInfo
{

    static AuUInt32 ReadUInt(const AuString &path)
    {
        AuString contents;
        if (AuIOFS::ReadString(path, contents))
        {
            char *endPtr;
            auto word = strtoll(contents.c_str(), &endPtr, 10);
            if (errno == ERANGE) return 0;
            return word;
        }

        return 0;
    }

    static void SetCaches()
    {
        gCpuInfo.dwCacheLine = ReadUInt("/sys/devices/system/cpu/cpu0/cache/index0/coherency_line_size");
        gCpuInfo.dwCacheL1   = ReadUInt("/sys/devices/system/cpu/cpu0/cache/index1/size");
        gCpuInfo.dwCacheL2   = ReadUInt("/sys/devices/system/cpu/cpu0/cache/index2/size");
        gCpuInfo.dwCacheL3   = ReadUInt("/sys/devices/system/cpu/cpu0/cache/index3/size");
    }

    void SetCpuTopologyLinux()
    {
        gCpuInfo.uSocket  = 1;
        gCpuInfo.uCores   = 1;
        gCpuInfo.uThreads = get_nprocs();

        // TODO: parse /proc/cpuinfo
        gCpuInfo.bMaskMTHalf = true;

        SetCaches();
    }
}