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ktypes.h

/***************************************************************************
                          ktypes.h  -  description
                             -------------------
    begin                : Sat Dec 13 2003
    copyright            : (C) 2003 by Dynacube Team
    email                : [email protected]
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program 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 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#ifndef __KTYPES_H
#define __KTYPES_H

    typedef unsigned char   DB; // 1 byte
    typedef unsigned short  DW; // 2 byte
    typedef unsigned int      DD;   // 4 byte

  //Signed xtensions
    typedef char      SDB;  // 1 byte
    typedef short   SDW;    // 2 byte
    typedef int       SDD;  // 4 byte
  

    typedef enum {false,true} boolean;
    typedef enum {dpl_0,dpl_1,dpl_3,dpl_4} DPL;

  #define TI_GLOBAL 0b
  #define TI_LOCAL  1b

    #define RPL_0 00b
    #define RPL_1 01b
    #define RPL_2 10b
    #define RPL_3 11b
    
    #define F_TYPE_CODE     1<<3
    #define F_TYPE_C        1<<2
    #define F_TYPE_R        1<<1

    #define F_TYPE_DATA     0
    #define F_TYPE_E        1<<2
    #define F_TYPE_W        1<<1
    
    #define F_TYPE_A        1

    typedef struct
    {
     DB rpl : 2;
     DB ti : 1;
     DW index:13;
    } SEG_SEL;

  #define F_DPL_1 01b
    #define F_DPL_2 10b
    #define F_DPL_3 11b

    #define F_S     1<<4        //Flag for Code/Data

    #define F_SD_DPL_1 1<<5
    #define F_SD_DPL_2 1<<6
    #define F_SD_DPL_3 (F_SD_DPL_1 | F_SD_DPL_2)

    #define F_P     1<<7    //Always Present in memory

    #define F_AVL   1
    #define F_D_B   1<<2
    #define F_G     1<<3

    typedef struct
    {
     DW lt_0_15;
     DW base_0_15;
     DB base_16_23;
     DB flags_8_15;
     DB lt_16_19 : 4;
     DB flags_20_23 : 4;
     DB base_24_31;
    } SEG_DESC;

  typedef struct
  {
    DW limit;     
    DW lobase;
    DW hibase;
  } GDT;

  typedef struct
  {
    DW limit;    
    DW lobase;
    DW hibase;
  } IDT;

  typedef struct
  {
    DW limit;
    DW lobase;
    DW hibase;
  } LDT;
  
    //For the following
    //eg:
    //      F_IG = F_IG_P | F_IG | F_DPL_0<<13
    //      F_TG = F_TG_P | F_TG | F_DPL_0<<13
    //      F_TRG = F_TRG_P | F_TRG | F_DPL_0<<13

    //Interrupt Gate
    /* P(1) DPL(2) 0 D(1) 1 1 0 | 0 0 0 | 0 0 0 0 0*/
  #define F_IG 0x0E00
    #define F_IG_P 1<<15

    typedef struct
    {
     DW off_0_15;
     DW segsel_16_31;
     DW flags_0_15;
     DW off_16_31;
    } IG_DESC;

    //Task Gate
    /* P(1) DPL(2) | 0 0 1 0 1 | 0 0 0 0 0 0 0 0 */
    #define F_TG 0x0500  
    #define F_TG_P  1<<15

    typedef struct
    {
     DW hole_0_15;
     DW tss_seg_sel_16_31;
     DW flags_0_15;
     DW hole_16_31;
    } TG_DESC;

  //Trap Gate
    /* P(1) DPL(2) 0 D 1 1 1 | 0 0 0 | 0 0 0 0 0 */
    #define F_TRG 0F00  
    #define F_TRG_P 1<<15;
    
    typedef struct
    { 
     DW off_0_15;
     DW segsel_16_31;
     DW flags_0_15;
     DW off_16_31;
    } TRG_DESC;

  typedef struct
  {
    DW off_0_15;
    DW segsel_16_31;
    DB param_count;
    DB flags;
    DW off_16_31;
  } CALL_GATE;
  
  extern DW cur_pid;

#endif

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