Shamusworld >> Repos - apple2/blob - src/v65c02.h

   1 //
   2 // Virtual 65C02 Header file
   3 //
   4 // by James L. Hammons
   5 // (c) 2005 Underground Software
   6 //
   7
   8 #ifndef __V65C02_H__
   9 #define __V65C02_H__
  10
  11 #include "types.h"
  12
  13 // Useful defines
  14
  15 #define FLAG_N          0x80                    // Negative
  16 #define FLAG_V          0x40                    // oVerflow
  17 #define FLAG_UNK        0x20                    // ??? (always set when read?)
  18 #define FLAG_B          0x10                    // Break
  19 #define FLAG_D          0x08                    // Decimal
  20 #define FLAG_I          0x04                    // Interrupt
  21 #define FLAG_Z          0x02                    // Zero
  22 #define FLAG_C          0x01                    // Carry
  23
  24 #define V65C02_ASSERT_LINE_RESET        0x0001          // v65C02 RESET line
  25 #define V65C02_ASSERT_LINE_IRQ          0x0002          // v65C02 IRQ line
  26 #define V65C02_ASSERT_LINE_NMI          0x0004          // v65C02 NMI line
  27 #define V65C02_STATE_ILLEGAL_INST       0x0008          // Illegal instruction executed flag
  28 //#define V65C02_START_DEBUG_LOG                0x0020          // Debug log go (temporary!)
  29
  30 // Useful structs
  31
  32 struct V65C02REGS
  33 {
  34         uint16 pc;                                              // 65C02 PC register
  35         uint8 cc;                                               // 65C02 Condition Code register
  36         uint8 sp;                                               // 65C02 System stack pointer (bound to $01xx)
  37         uint8 a;                                                // 65C02 A register
  38         uint8 x;                                                // 65C02 X index register
  39         uint8 y;                                                // 65C02 Y register
  40         uint32 clock;                                   // 65C02 clock
  41         uint8 (* RdMem)(uint16);                // Address of BYTE read routine
  42         void (* WrMem)(uint16, uint8);  // Address of BYTE write routine
  43         uint16 cpuFlags;                                // v65C02 IRQ/RESET flags
  44 };
  45
  46 // Global variables (exported)
  47
  48 extern bool dumpDis;
  49
  50 // Function prototypes
  51
  52 void Execute65C02(V65C02REGS *, uint32);        // Function to execute 65C02 instructions
  53 uint32 GetCurrentV65C02Clock(void);                             // Get the clock of the currently executing CPU
  54
  55 #endif  // __V65C02_H__