/**************************************************************************************
 Copyright (c) 2002 The UbixOS Project
 All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions, the following disclaimer and the list of authors.
Redistributions in binary form must reproduce the above copyright notice, this list of conditions, the following disclaimer and the list of authors
in the documentation and/or other materials provided with the distribution. Neither the name of the UbixOS Project nor the names of its
contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 $Id$

**************************************************************************************/

#include <ubixos/gdt.h>
#include <ubixos/schedule.h>
#include <ubixos/idt.h>
#include <ubixos/exec.h>
#include <ubixos/idlethread.h>
#include <ubixos/vitals.h>
#include <drivers/video.h>
#include <drivers/8259.h>
#include <drivers/keyboard.h>
#include <drivers/fdc.h>
#include <version/version.h>
#include <vmm/memory.h>
#include <vmm/paging.h>
#include <ubixfs/ubixfs.h>

descriptorTable(GDT,6) {
  {dummy:0},
  standardDescriptor(0x0, 0xFFFFF, (dCode + dRead + dBig + dBiglim)),
  standardDescriptor(0x0, 0xFFFFF, (dData + dWrite + dBig + dBiglim)),
  standardDescriptor(0x0, 0xFFFFF, (dLdt)),
  standardDescriptor(0x100000, sizeof(struct tssStruct), (dTss)),
  standardDescriptor(0x4000,   sizeof(struct tssStruct), (dTss)),
  };

struct {
  unsigned short limit __attribute__ ((packed));
  union descriptorTableunion *gdt __attribute__ ((packed));
  } loadGdt = { (6 * sizeof(union descriptorTableunion) - 1), GDT };

int main();

void _start(void) {
  asm("cli");
  asm(
    "mov %cr0,%eax        \n"
    "and $0xFFFFFFFE,%eax \n"
    "mov %eax,%cr0        \n"
    "or $0x1,%eax         \n"
    "mov %eax,%cr0        \n"
    "lgdtl (loadGdt)   \n"
    "movw $0x10,%ax    \n"
    "movw %ax,%ds      \n"
    "movw %ax,%es      \n"
    "movw %ax,%fs      \n"
    "movw %ax,%gs      \n"
    "movw %ax,%ss      \n"
    "movl $0xFFFF,%esp \n"
    "mov $0x18,%ax     \n" //Set up dummy LDT
    "lldt %ax          \n"
    "mov $0x20,%ax     \n" // Set up dummy TSS
    "ltr %ax           \n" // Loads dummy TSS
    );
  main(); //Start Of Kernel Functionality
  while(1);
  }

/************************************************************************

Function: int main();
Description: This Is The Main Kernel Function Does All The Initialization
             Then Starts The INIT Program Which Will Take Over
Notes:

07/30/02 - I'm Considering Making The Kernel Fork Then Execute INIT
           However It Seems To Be Pretty Stable As Is

************************************************************************/
int main() {
  initMmap();         //Initialize Memory Map
  clearScreen();      //Clear The Screen
  outputVersion();    //Display Version Info
  initPagingSystem(); //Initialize Paging System
  initVitals();       //Initialize Vitals Tracking
  init8259();         //Initialize PIC
  initIdt();          //Initialize IDT
  initKeyboard();     //Initialize Keyboar
  initScheduler();    //Initialize Scheduler
  initFloppy();       //Initialize Floppy Controller
  initUbixFS();       //Initialize File System
  //initPit();
  execThread(idleThread,0xAFFF,"Idle Thread");
  execFile("init");
  kprintf("Free Pages: [%i]\n",freePages);
  enableIrq(0);
  asm("hlt");
  }