//----------------------------------------------------------------------------//
//                           GNU GPL OS/K                                     //
//                                                                            //
//  Desc:       ACPI, Hardware detection related functions                    //
//                                                                            //
//                                                                            //
//  Copyright © 2018-2019 The OS/K Team                                       //
//                                                                            //
//  This file is part of OS/K.                                                //
//                                                                            //
//  OS/K 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 3 of the License, or         //
//  any later version.                                                        //
//                                                                            //
//  OS/K 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 OS/K.  If not, see <https://www.gnu.org/licenses/>.            //
//----------------------------------------------------------------------------//

#include <init/boot.h>
#include <io/vga.h>
#include <io/acpi.h>

void IoTestAcpi(void)
{

    if (BtFirmwareInfo.romValid)
        KernLog("\tRom Table is valid at %p\n", BtFirmwareInfo.romTable);

    if (BtFirmwareInfo.apmValid)
        KernLog("\tApm Table is valid at %p\n", BtFirmwareInfo.apmTable);

    RSDPDescriptor *rsdp = IoFindRSDP();
    if (!rsdp)
        return;

    KernLog("\tFound ACPI RSDP (%s) version %d at %p\n",
            rsdp->OEMID, (uint)rsdp->revision, rsdp
            );

    return;
}

RSDPDescriptor *IoFindRSDP()
{
    char *rsdp = NULL;


    // Search in EBDA
    for (rsdp = (char *)0x00080000;   // EBDA address
         (ulong)rsdp < (ulong)0x0009FFFF;             // EBDA end
         rsdp++) {

            if (rsdp[0] == 'R' &&
                rsdp[1] == 'S' &&
                rsdp[2] == 'D' &&
                rsdp[3] == ' ' &&
                rsdp[4] == 'P' &&
                rsdp[5] == 'T' &&
                rsdp[6] == 'R' &&
                rsdp[7] == ' '
                ) {
                return (RSDPDescriptor *)rsdp;
            }
        }

    // Search in BDA
    for (rsdp = (char *)0x000E0000;   // BDA address
         (ulong)rsdp < (ulong)0x000FFFFF;             // BDA end
         rsdp++) {

            if (rsdp[0] == 'R' &&
                rsdp[1] == 'S' &&
                rsdp[2] == 'D' &&
                rsdp[3] == ' ' &&
                rsdp[4] == 'P' &&
                rsdp[5] == 'T' &&
                rsdp[6] == 'R' &&
                rsdp[7] == ' '
                ) {
                return (RSDPDescriptor *)rsdp;
            }
        }

    return NULL;
}