/* $Id: kLdrMisc.c 2944 2007-01-13 15:55:40Z bird $ */
/** @file
 *
 * kLdr - The Dynamic Loader, Misc APIs.
 *
 * Copyright (c) 2006-2007 knut st. osmundsen <bird@anduin.net>
 *
 *
 * This file is part of kLdr.
 *
 * kLdr is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * kLdr 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 General Public License
 * along with kLdr; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */


/*******************************************************************************
*   Header Files                                                               *
*******************************************************************************/
#include "kLdr.h"
#include "kLdrHlp.h"
#include "kLdrInternal.h"


/**
 * Compares arch+cpu some code was generated for with a arch+cpu for executing it
 * to see if it'll work out fine or not.
 *
 * @returns 0 if the code is compatible with the cpu.
 * @returns KLDR_ERR_ARCH_CPU_NOT_COMPATIBLE if the arch+cpu isn't compatible with the code.
 * @param   enmCodeArch The architecture the code was generated for.
 * @param   enmCodeCpu  The cpu the code was generated for.
 * @param   enmArch     The architecture to run it on.
 * @param   enmCpu      The cpu to run it on.
 */
int kLdrCompareCpus(KLDRARCH enmCodeArch, KLDRCPU enmCodeCpu, KLDRARCH enmArch, KLDRCPU enmCpu)
{
    /*
     * Compare arch and cpu.
     */
    if (enmCodeArch != enmArch)
        return KLDR_ERR_ARCH_CPU_NOT_COMPATIBLE;

    /* exact match is nice. */
    if (enmCodeCpu == enmCpu)
        return 0;
    switch (enmArch)
    {
        case KLDRARCH_X86_16:
            if (enmCpu < KLDRCPU_FIRST_X86_16 || enmCpu > KLDRCPU_LAST_X86_16)
                return KLDR_ERR_INVALID_PARAMETER;

            /* intel? */
            if (enmCodeCpu <= KLDRCPU_CORE2_16)
            {
                /* also intel? */
                if (enmCpu <= KLDRCPU_CORE2_16)
                    return enmCodeCpu <= enmCpu ? 0 : KLDR_ERR_ARCH_CPU_NOT_COMPATIBLE;
                switch (enmCpu)
                {
                    case KLDRCPU_K6_16:
                        return enmCodeCpu <= KLDRCPU_I586 ? 0 : KLDR_ERR_ARCH_CPU_NOT_COMPATIBLE;
                    case KLDRCPU_K7_16:
                    case KLDRCPU_K8_16:
                    default:
                        return enmCodeCpu <= KLDRCPU_I686 ? 0 : KLDR_ERR_ARCH_CPU_NOT_COMPATIBLE;
                }
            }
            /* amd */
            return enmCpu >= KLDRCPU_K6_16 && enmCpu <= KLDRCPU_K8_16
                    ? 0 : KLDR_ERR_ARCH_CPU_NOT_COMPATIBLE;

        case KLDRARCH_X86_32:
            if (enmCpu < KLDRCPU_FIRST_X86_32 || enmCpu > KLDRCPU_LAST_X86_32)
                return KLDR_ERR_INVALID_PARAMETER;

            /* blend? */
            if (enmCodeCpu == KLDRCPU_X86_32_BLEND)
                return 0;

            /* intel? */
            if (enmCodeCpu <= KLDRCPU_CORE2_32)
            {
                /* also intel? */
                if (enmCpu <= KLDRCPU_CORE2_32)
                    return enmCodeCpu <= enmCpu ? 0 : KLDR_ERR_ARCH_CPU_NOT_COMPATIBLE;
                switch (enmCpu)
                {
                    case KLDRCPU_K6:
                        return enmCodeCpu <= KLDRCPU_I586 ? 0 : KLDR_ERR_ARCH_CPU_NOT_COMPATIBLE;
                    case KLDRCPU_K7:
                    case KLDRCPU_K8_32:
                    default:
                        return enmCodeCpu <= KLDRCPU_I686 ? 0 : KLDR_ERR_ARCH_CPU_NOT_COMPATIBLE;
                }
            }
            /* amd */
            return enmCpu >= KLDRCPU_K6 && enmCpu <= KLDRCPU_K8_32
                    ? 0 : KLDR_ERR_ARCH_CPU_NOT_COMPATIBLE;

        case KLDRARCH_AMD64:
            if (enmCpu < KLDRCPU_FIRST_AMD64 || enmCpu > KLDRCPU_LAST_AMD64)
                return KLDR_ERR_INVALID_PARAMETER;

            /* blend? */
            if (enmCodeCpu == KLDRCPU_AMD64_BLEND)
                return 0;
            /* this is simple for now. */
            return KLDR_ERR_ARCH_CPU_NOT_COMPATIBLE;

        default:
            break;
    }
    return KLDR_ERR_ARCH_CPU_NOT_COMPATIBLE;
}


/**
 * Gets the arch+cpu of the calling cpu.
 *
 * @param   penmArch    Where to store the cpu architecture.
 * @param   penmCpu     Where to store the cpu brand/model.
 */
void kLdrGetArchCpu(PKLDRARCH penmArch, PKLDRCPU penmCpu)
{
#ifdef __AMD64__
    *penmArch = KLDRARCH_AMD64;
    *penmCpu = KLDRCPU_AMD64_BLEND; /** @todo check it using cpu. */

#elif defined(__X86__)
    *penmArch = KLDRARCH_X86_32;
    *penmCpu = KLDRCPU_X86_32_BLEND; /** @todo check it using cpu. */

#else
# error "Port me"
#endif
}