//----------------------------------------------------------------------------//
//                           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 <kernel/multiboot.h>
#include <kernel/term.h>
#include <kernel/panic.h>
#include <kernel/mm.h>

//
// BootInfo_t initialization. It is necessary because grub will potentially be
//  wiped since it is below 1MB....
//
void InitBootInfo(multiboot_info_t *mbi)
{
    // We need the multiboot structure
    KalAlwaysAssert(mbi);
    extern uint MB_header;

    //Retrieves the bootloader informations
    GetBootInfo(btldr).grubFlags       = mbi->flags;
    GetBootInfo(btldr).grubName        = (mbi->boot_loader_name);
    GetBootInfo(btldr).modulesCount    = mbi->mods_count;
    GetBootInfo(btldr).modulesAddr     = (void*)(ullong)mbi->mods_addr;
    GetBootInfo(btldr).mbHeaderAddr    = (void*)(ullong)&MB_header;
    DebugLog("\n[InitBootInfo] %s\n", GetBootInfo(btldr).grubName);
    DebugLog("[InitBootInfo] Header address : %p, modules address : %p\n",
              GetBootInfo(btldr).mbHeaderAddr, GetBootInfo(btldr).modulesAddr);
    DebugLog("[InitBootInfo] GRUB flags : %x\n", GetBootInfo(btldr).grubFlags);

    //Retrieves the drives informations
    GetBootInfo(drives).bootDrv        = mbi->boot_device;
    GetBootInfo(drives).bufferLength   = mbi->drives_length;
    GetBootInfo(drives).bufferAddr     = (void*)(ullong)mbi->drives_addr;
    DebugLog("[InitBootInfo] Root drive : %x\n",
             GetBootInfo(drives).bootDrv);

    //Retrieves the memory informations
    GetBootInfo(memory).lowMemory       = mbi->mem_lower;
    GetBootInfo(memory).upMemory        = mbi->mem_upper;
    GetBootInfo(memory).mapAddr         = (void*)(ullong)mbi->mmap_addr;
    GetBootInfo(memory).mapLength       = mbi->mmap_length;
    DebugLog("[InitBootInfo] Low memory : %d Kio, Up memory : %d Mio\n",
             GetBootInfo(memory).lowMemory, GetBootInfo(memory).upMemory / (MB/KB));
    DebugLog("[InitBootInfo] Memory map address : %p, length : %d\n",
             GetBootInfo(memory).mapAddr, GetBootInfo(memory).mapLength);

    // XXX assign video infos, but unused at this time

    // Retrieves the firmware infos
    GetBootInfo(firmware).apmTable      = mbi->apm_table;
    GetBootInfo(firmware).romTable      = mbi->config_table;
    DebugLog("[InitBootInfo] APM Table : %p, ROM Table : %p\n",
             GetBootInfo(firmware).apmTable, GetBootInfo(firmware).romTable);
}


//
// Entry point of the Kaleid kernel
//
noreturn void StartKern(multiboot_info_t *mbInfo, int mbMagic)
{
    // We're not ready to deal with interrupts
    DisableIRQs();

    // Kernel terminals
    InitTerms();

    //Hello world because why not
    KernLog("%c%c%c OS/K\n\n", 219, 219, 219);

    KalAlwaysAssert(mbMagic == MULTIBOOT_BOOTLOADER_MAGIC);
    KernLog("[Init] We have magic : %x\n", mbMagic);

    //Initialize the BootInfo_t structure
    InitBootInfo(mbInfo);

    //Memory mapping
    InitMemoryMap();

    // We're out
    KernLog("\n[Init] Evil never dies !");
    CrashSystem(); //yay
}