subsystems/ntvdm/hardware/pic.h

   1 /*
   2  * COPYRIGHT:       GPL - See COPYING in the top level directory
   3  * PROJECT:         ReactOS Virtual DOS Machine
   4  * FILE:            pic.h
   5  * PURPOSE:         Programmable Interrupt Controller emulation
   6  *                  (Interrupt Controller Adapter (ICA) in Windows terminology)
   7  * PROGRAMMERS:     Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
   8  */
   9
  10 #ifndef _PIC_H_
  11 #define _PIC_H_
  12
  13 /* INCLUDES *******************************************************************/
  14
  15 #include "ntvdm.h"
  16
  17 /* DEFINES ********************************************************************/
  18
  19 #define PIC_MASTER_CMD  0x20
  20 #define PIC_MASTER_DATA 0x21
  21 #define PIC_SLAVE_CMD   0xA0
  22 #define PIC_SLAVE_DATA  0xA1
  23
  24 #define PIC_ICW1        0x10
  25 #define PIC_ICW1_ICW4   (1 << 0)
  26 #define PIC_ICW1_SINGLE (1 << 1)
  27 #define PIC_ICW4_8086   (1 << 0)
  28 #define PIC_ICW4_AEOI   (1 << 1)
  29
  30 #define PIC_OCW2_NUM_MASK   0x07
  31 #define PIC_OCW2_EOI        (1 << 5)
  32 #define PIC_OCW2_SL         (1 << 6)
  33
  34 #define PIC_OCW3            (1 << 3)
  35 #define PIC_OCW3_READ_ISR   0x0B
  36
  37 typedef struct _PIC
  38 {
  39     BOOLEAN Initialization;
  40     BYTE MaskRegister;
  41     BYTE IntRequestRegister;
  42     BYTE InServiceRegister;
  43     BYTE IntOffset;
  44     BYTE ConfigRegister;
  45     BYTE CascadeRegister;
  46     BOOLEAN CascadeRegisterSet;
  47     BOOLEAN AutoEoi;
  48     BOOLEAN Slave;
  49     BOOLEAN ReadIsr;
  50 } PIC, *PPIC;
  51
  52 /* FUNCTIONS ******************************************************************/
  53
  54 VOID PicInterruptRequest(BYTE Number);
  55 BYTE PicGetInterrupt(VOID);
  56
  57 VOID PicInitialize(VOID);
  58
  59 #endif // _PIC_H_
  60
  61 /* EOF */