Shamusworld >> Repos - thunder/blob - src/v6809.h

   1 //
   2 // Virtual 6809 Header file
   3 //
   4 // by James L. Hammons
   5 //
   6 // (c) 1997, 2004 Underground Software
   7 //
   8
   9 #ifndef __V6809_H__
  10 #define __V6809_H__
  11
  12 #include "types.h"
  13
  14 // Useful defines
  15
  16 #define FLAG_E          0x80            // Entire
  17 #define FLAG_F          0x40            // Fast IRQ
  18 #define FLAG_H          0x20            // Half carry
  19 #define FLAG_I          0x10            // IRQ
  20 #define FLAG_N          0x08            // Negative
  21 #define FLAG_Z          0x04            // Zero
  22 #define FLAG_V          0x02            // oVerflow
  23 #define FLAG_C          0x01            // Carry
  24
  25 #define V6809_ASSERT_LINE_RESET         0x0001          // v6809 RESET line
  26 #define V6809_ASSERT_LINE_IRQ           0x0002          // v6809 IRQ line
  27 #define V6809_ASSERT_LINE_FIRQ          0x0004          // v6809 FIRQ line
  28 #define V6809_ASSERT_LINE_NMI           0x0008          // v6809 NMI line
  29 #define V6809_STATE_SYNC                        0x0010          // v6809 SYNC line
  30 #define V6809_STATE_ILLEGAL_INST        0x0020          // Illegal instruction executed flag
  31
  32 //#define V6809_START_DEBUG_LOG EQU     0020h           // Debug log go (temporary!)
  33
  34 // Useful structs
  35
  36 struct V6809REGS
  37 {
  38         WORD pc;                                        // 6809 PC register
  39         WORD x;                                         // 6809 X index register
  40         WORD y;                                         // 6809 Y index register
  41         WORD s;                                         // 6809 System stack pointer
  42         WORD u;                                         // 6809 User stack pointer
  43         BYTE cc;                                        // 6809 Condition Code register
  44         BYTE a;                                         // 6809 A register
  45         BYTE b;                                         // 6809 B register
  46         BYTE dp;                                        // 6809 Direct Page register
  47         DWORD clock;                            // 6809 clock
  48 //DWORD _reserved;//    BYTE (* Fetch)(WORD&);          // Address of BYTE fetch routine
  49         BYTE (* RdMem)(WORD);           // Address of BYTE read routine
  50         void (* WrMem)(WORD, BYTE);     // Address of BYTE write routine
  51         DWORD cpuFlags;                         // v6809 IRQ/RESET flags
  52 };
  53
  54 // Function prototypes
  55
  56 void Execute6809(V6809REGS *, DWORD);                                   // Function to execute 6809 instructions
  57
  58 #endif  // __V6809_H__