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

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