/*****************************************************************************************
 Copyright (c) 2002-2004, 2005, 2007, 2008,2009 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/init.h>
#include <sys/gdt.h>
#include <sys/video.h>
#include <sys/tss.h>
#include <ubixos/exec.h>
#include <ubixos/kpanic.h>
#include <ubixos/systemtask.h>
#include <vfs/mount.h>
#include <lib/kprintf.h>
#include <lib/kmalloc.h>
#include <lib/string.h>

#define B_ADAPTORSHIFT          24
#define B_ADAPTORMASK           0x0f
#define B_ADAPTOR(val)          (((val) >> B_ADAPTORSHIFT) & B_ADAPTORMASK)
#define B_CONTROLLERSHIFT       20
#define B_CONTROLLERMASK        0xf
#define B_CONTROLLER(val)       (((val)>>B_CONTROLLERSHIFT) & B_CONTROLLERMASK)
#define B_SLICESHIFT            20
#define B_SLICEMASK             0xff
#define B_SLICE(val)            (((val)>>B_SLICESHIFT) & B_SLICEMASK)
#define B_UNITSHIFT             16
#define B_UNITMASK              0xf
#define B_UNIT(val)             (((val) >> B_UNITSHIFT) & B_UNITMASK)
#define B_PARTITIONSHIFT        8
#define B_PARTITIONMASK         0xff
#define B_PARTITION(val)        (((val) >> B_PARTITIONSHIFT) & B_PARTITIONMASK)
#define B_TYPESHIFT             0
#define B_TYPEMASK              0xff
#define B_TYPE(val)             (((val) >> B_TYPESHIFT) & B_TYPEMASK)


/*****************************************************************************************
 Desc: The Kernels Descriptor table:
       0x00 - Dummy Entry
       0x08 - Ring 0 CS
       0x10 - Ring 0 DS
       0x18 - Dummy LDT
       0x20 - Scheduler TSS
       0x28 - Ring 3 CS
       0x30 - Ring 3 DS
       0x38 - GPF TSS
       0x40 - Stack Fault TSS

 Notes:

*****************************************************************************************/
ubixDescriptorTable(ubixGDT,9) {
  {dummy:0},
  ubixStandardDescriptor(0x0000, 0xFFFFF, (dCode + dRead + dBig + dBiglim)),
  ubixStandardDescriptor(0x0000, 0xFFFFF, (dData + dWrite + dBig + dBiglim)),
  ubixStandardDescriptor(0x0000, 0xFFFFF, (dLdt)),
  ubixStandardDescriptor(0x4200, (sizeof(struct tssStruct)), (dTss + dDpl3)),
  ubixStandardDescriptor(0x0000, 0xFFFFF, (dCode + dWrite + dBig + dBiglim + dDpl3)),
  ubixStandardDescriptor(0x0000, 0xFFFFF, (dData + dWrite + dBig + dBiglim + dDpl3)),
  ubixStandardDescriptor(0x4200, (sizeof(struct tssStruct)), (dTss)),
  ubixStandardDescriptor(0x6200, (sizeof(struct tssStruct)), (dTss)),
  };
struct {
  unsigned short limit __attribute__ ((packed));
  union descriptorTableUnion *gdt __attribute__ ((packed));
  } loadGDT = { (9 * sizeof(union descriptorTableUnion) - 1), ubixGDT };

/**
 * \brief This is the entry point into the os where all of the kernels sub systems are started up.
 *
 * \param rootdev address of root device structure
 */
int kmain(uInt32 rootdev) {
  /* Set up counter for startup routine */
  int i = 0x0;
  uInt32 *sysTask = 0x0;

  /* We preform a clearScreen to make the TEXT buffer nice and empty */
  screenClear();

  /* Modify src/sys/include/ubixos/init.h to add a startup routine */
  for (i=0x0;i<init_tasksTotal;i++) {
    if (init_tasks[i]() != 0x0) {
      kpanic("Error: Initializing System.\n");
      }
    }

  /* New Root Mount Point */
  //Old 2 new 10
  //#ifdef DEBUG
  kprintf("[0x%X][0x%X:0x%X:0x%X:0x%X:0x%X:0x%X]\n",rootdev,B_ADAPTOR(rootdev),B_CONTROLLER(rootdev),B_SLICE(rootdev),B_UNIT(rootdev),B_PARTITION(rootdev),B_TYPE(rootdev));
  //#endif
  //if (vfs_mount(0x1,B_PARTITION(rootdev)+2,0x0,0xAA,"sys","rw") != 0x0) {


  /* Mount Root */
  if (vfs_mount(0x1,0x2,0x0,0xAA,"sys","rw") != 0x0) {
    kprintf("Problem Mounting sys Mount Point\n");
    }

  /* Initialize the system */
  kprintf("Free Pages: [%i]\n",systemVitals->freePages);

  kprintf("MemoryMap:  [0x%X]\n",vmmMemoryMap);
  kprintf("Starting UbixOS\n");

  /* Create Stack Space For System Task */
  sysTask = kmalloc(0x2000);
  if(sysTask == NULL)
    kprintf("OS: Unable to allocate memory\n");

  kprintf("T");

  /* Execute System Task */
  // Send stack size to app zero there?
  memset(sysTask,0x0,0x2000);
  execThread(systemTask, (uInt32)sysTask+0x2000,0x0);

  kprintf("P");

  /* Execute Init Process */
  execFile("sys:/bin/init",0x0,0x0,0x0); /* OS Initializer    */

  kprintf("BOO\n");
//        execFile("sys:/bin/login",0x0,0x0,0x1);
//        execFile("sys:/bin/login",0x0,0x0,0x2);

	irqEnable(0x0);

	while (0x1)
		asm("hlt"); /* Keep haulting until the scheduler reacts */

	/* Return to start however we should never get this far */
	return(0x0);
}

/***
 END
 ***/