Shamusworld >> Repos - stargem2/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         uint16 pc;                                              // 6809 PC register
  39         uint16 x;                                               // 6809 X index register
  40         uint16 y;                                               // 6809 Y index register
  41         uint16 s;                                               // 6809 System stack pointer
  42         uint16 u;                                               // 6809 User stack pointer
  43         uint8 cc;                                               // 6809 Condition Code register
  44         uint8 a;                                                // 6809 A register
  45         uint8 b;                                                // 6809 B register
  46         uint8 dp;                                               // 6809 Direct Page register
  47         uint32 clock;                                   // 6809 clock
  48 //uint32 _reserved;//   uint8 (* Fetch)(uint16&);               // Address of uint8 fetch routine
  49         uint8 (* RdMem)(uint16);                // Address of uint8 read routine
  50         void (* WrMem)(uint16, uint8);  // Address of uint8 write routine
  51         uint32 cpuFlags;                                // v6809 IRQ/RESET flags
  52 };
  53
  54 // Function prototypes
  55
  56 void Execute6809(V6809REGS *, uint32);                  // Function to execute 6809 instructions
  57 uint32 GetCurrentV6809Clock(void);                              // Get the clock of the currently executing CPU
  58
  59 #endif  // __V6809_H__