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

   1 //
   2 // Virtual 65C02 Header file
   3 //
   4 // by James Hammons
   5 // (c) 2005-2018 Underground Software
   6 //
   7
   8 #ifndef __V65C02_H__
   9 #define __V65C02_H__
  10
  11 #include <stdint.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_t pc;                            // 65C02 PC register
  35         uint8_t cc;                                     // 65C02 Condition Code register
  36         uint8_t sp;                                     // 65C02 System stack pointer (bound to $01xx)
  37         uint8_t a;                                      // 65C02 A register
  38         uint8_t x;                                      // 65C02 X index register
  39         uint8_t y;                                      // 65C02 Y register
  40         uint64_t clock;                         // 65C02 clock (@1 MHz, wraps at 570,842 years)
  41         uint8_t (* RdMem)(uint16_t);    // Address of BYTE read routine
  42         void (* WrMem)(uint16_t, uint8_t);      // Address of BYTE write routine
  43         void (* Timer)(uint16_t);       // Address of Timer routine
  44         uint16_t cpuFlags;                      // v65C02 IRQ/RESET flags
  45         uint64_t overflow;                      // # of cycles we went over last time through
  46 };
  47
  48 // Global variables (exported)
  49
  50 extern bool dumpDis;
  51
  52 // Exported functions
  53
  54 void Execute65C02(V65C02REGS *, uint32_t);
  55
  56 #endif  // __V65C02_H__
  57