Shamusworld >> Repos - thunder/blob - src/v6808.h

   1 //
   2 // Virtual 6808 Header file
   3 //
   4 // by James L. Hammons
   5 //
   6 // (C) 2006 Underground Software
   7 //
   8
   9 #ifndef __V6808_H__
  10 #define __V6808_H__
  11
  12 #include "types.h"
  13
  14 // Useful defines
  15
  16 #define FLAG_E          0x80            // ??? Entire ??? [No.]
  17 #define FLAG_F          0x40            // ??? Fast IRQ ??? [No.]
  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 V6808_ASSERT_LINE_RESET         0x0001          // v6808 RESET line
  26 #define V6808_ASSERT_LINE_IRQ           0x0002          // v6808 IRQ line
  27 #define V6808_ASSERT_LINE_NMI           0x0004          // v6808 NMI line
  28 #define V6808_STATE_WAI                         0x0008          // v6808 wait for IRQ line
  29 #define V6808_STATE_ILLEGAL_INST        0x0010          // Illegal instruction executed flag
  30 //#define V6809_START_DEBUG_LOG         0x0020          // Debug log go (temporary!)
  31
  32 // Useful structs
  33
  34 struct V6808REGS
  35 {
  36         uint16 pc;                                              // 6808 PC register
  37         uint16 x;                                               // 6808 X index register
  38         uint16 s;                                               // 6808 System stack pointer
  39         uint8 cc;                                               // 6808 Condition Code register
  40         uint8 a;                                                // 6808 A register
  41         uint8 b;                                                // 6808 B register
  42         uint64 clock;                                   // 6808 clock
  43         uint8 (* RdMem)(uint16);                // Address of uint8 read routine
  44         void (* WrMem)(uint16, uint8);  // Address of uint8 write routine
  45         uint32 cpuFlags;                                // v6808 IRQ/RESET flags
  46         uint32 clockOverrun;                    // Amount of overflow between runs
  47 };
  48
  49 // Function prototypes
  50
  51 void Execute6808(V6808REGS *, uint32);  // Function to execute 6808 instructions
  52 uint64 GetCurrentV6808Clock(void);              // Get the clock of the currently executing CPU
  53 //uint8 GetCCRegister(void);                            // Hmm.
  54
  55 #endif  // __V6808_H__