ktypes.h

/***************************************************************************
                          ktypes.h  -  description
                             -------------------
    begin                : Sat Dec 13 2003
    copyright            : (C) 2003 by Dynacube Team
    email                : mdshah82@yahoo.com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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;

        #ifndef __SIZE_T
                #define size_t DD
        #endif

#endif

---