os-k/kaleid/kernel/init/init.c

//----------------------------------------------------------------------------//
//                           GNU GPL OS/K                                     //
//                                                                            //
//  Desc:       Kernel entry point                                            //
//                                                                            //
//                                                                            //
//  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.h"

void MmInitPaging(void);
void MmActivatePageHandler(void);

//
// Entry point of the Kaleid kernel
//
noreturn void BtStartKern(multiboot_info_t *mbInfo, uint mbMagic, void *codeSeg)
{
    KeDisableIRQs();

    // Initialize the BootInfo_t structure
    BtInitBootInfo(mbInfo, codeSeg);

    // Screen I/O available from this point on
    IoInitVGABuffer();
    IoEnableCursor();
    IoUpdateCursor(0, 0);

    KernLog("%C%c%c%c OS/K\n\n%C",
             VGA_COLOR_WHITE,
             219,
             219,
             219,
             VGA_COLOR_LIGHT_GREY
            );

    // Sanity checks
    BtDoSanityChecks(mbMagic);

    // Memory
    MmInitMemoryMap();
    MmInitGdt();
    MmInitPaging();
    MmInitHeap();

    // Interrupts launching
    KeSetupIDT();
    KeEnableIRQs();

    // Start drivers
    KeEnableRTC();
    IoEnableKeyb();
    MmActivatePageHandler();

    KeStartShell();

    PoShutdown();
}