//----------------------------------------------------------------------------//
//                           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 <extras/buf.h>
#include <kernel/iomisc.h>
#include <kernel/cursor.h>
#include <kernel/mboot.h>
#include <kernel/heap.h>
#include <kernel/mm.h>
#include <kernel/time.h>
#include <kernel/speaker.h>
#include <kernel/pwmgnt.h>

// info.c
extern void BtDoSanityChecks(uint mbMagic);
extern void BtInitBootInfo(multiboot_info_t *mbi, void *codeSeg);

// io/vga.c
extern error_t IoInitVGABuffer(void);
extern void IoScrollDown(void);
extern void IoScrollUp(void);

// io/keyb.c
extern void IoEnableKeyb(void);

// cpu/idt.c
extern void IdtSetup(void);

// ps/proc.c test function
extern void pstest(void);

// interrupts tests
extern void divideByZero(void);

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

    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 OS/K\n\n", 219, 219, 219); //grrr

    // Sanity checks
    BtDoSanityChecks(mbMagic);

    // Memory & scheduler
    MmInitMemoryMap();

    // Several inits
    MmInitHeap();
    PsInitSched();

    // Interrupts launching
    IdtSetup();
    KeEnableIRQs();

    // Start drivers
    IoEnableRtc();
    IoEnableKeyb();

    IoGetRtcTimeChar();
    IoPrintRtcTime();

    int i=0;
    while(i++<50)KernLog("%d\n", i);

    // Main loop
    while ((rc = bgetc(BStdIn, &ch)) == EOK) {
        switch (ch) {
        case 17: // DC1
            IoScrollUp();
            break;
        case 18: // DC2
            IoScrollDown();
            break;
        case 27: // ESC
            BFlushBuf(BStdOut);
            PoShutdownQemu();
            break;
        }
    }

    KernLog("End of input reached\n");
    PoShutdownQemu();
}