/*
 open source routing machine
 Copyright (C) Dennis Luxen, others 2010

 This program is free software; you can redistribute it and/or modify
 it under the terms of the GNU AFFERO General Public License as published by
 the Free Software Foundation; either version 3 of the License, or
 any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU Affero General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 or see http://www.gnu.org/licenses/agpl.txt.
 */

#ifndef MACHINE_INFO_H
#define MACHINE_INFO_H

#if defined(__APPLE__) || defined(__FreeBSD__)
extern "C" {
    #include <sys/types.h>
    #include <sys/sysctl.h>
}
#elif defined _WIN32
    #include <windows.h>
#endif

enum Endianness {
    LittleEndian = 1,
    BigEndian = 2
};

//Function is optimized to a single 'mov eax,1' on GCC, clang and icc using -O3
inline Endianness getMachineEndianness() {
    int i(1);
    char *p = (char *) &i;
    if (1 == p[0])
        return LittleEndian;
    return BigEndian;
}

// Reverses Network Byte Order into something usable, compiles down to a bswap-mov combination
inline unsigned swapEndian(unsigned x) {
    if(getMachineEndianness() == LittleEndian)
        return ( (x>>24) | ((x<<8) & 0x00FF0000) | ((x>>8) & 0x0000FF00) | (x<<24) );
    return x;
}

// Returns the physical memory size in kilobytes
inline unsigned GetPhysicalmemory(void){
#if defined(SUN5) || defined(__linux__)
	return (sysconf(_SC_PHYS_PAGES) * sysconf(_SC_PAGESIZE));

#elif defined(__APPLE__)
	int mib[2] = {CTL_HW, HW_MEMSIZE};
	long long memsize;
	size_t len = sizeof(memsize);
	sysctl(mib, 2, &memsize, &len, NULL, 0);
	return memsize/1024;

#elif defined(__FreeBSD__)
	int mib[2] = {CTL_HW, HW_PHYSMEM};
	long long memsize;
	size_t len = sizeof(memsize);
	sysctl(mib, 2, &memsize, &len, NULL, 0);
	return memsize/1024;

#elif defined(_WIN32)
	MEMORYSTATUSEX status;
	status.dwLength = sizeof(status);
	GlobalMemoryStatusEx(&status);
	return status.ullTotalPhys/1024;
#else
	std::cout << "[Warning] Compiling on unknown architecture." << std::endl
		<< "Please file a ticket at http://project-osrm.org" << std::endl;
	return 2048*1024; /* 128 Mb default memory */

#endif
}
#endif // MACHINE_INFO_H