git.sur5r.net Git - cc65/blob - src/sim65/cpucore.h

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                   cpucore.h                               */
   4 /*                                                                           */
   5 /*                        CPU core for the 6502 simulator                    */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 2002      Ullrich von Bassewitz                                       */
  10 /*               Wacholderweg 14                                             */
  11 /*               D-70597 Stuttgart                                           */
  12 /* EMail:        uz@cc65.org                                                 */
  13 /*                                                                           */
  14 /*                                                                           */
  15 /* This software is provided 'as-is', without any expressed or implied       */
  16 /* warranty.  In no event will the authors be held liable for any damages    */
  17 /* arising from the use of this software.                                    */
  18 /*                                                                           */
  19 /* Permission is granted to anyone to use this software for any purpose,     */
  20 /* including commercial applications, and to alter it and redistribute it    */
  21 /* freely, subject to the following restrictions:                            */
  22 /*                                                                           */
  23 /* 1. The origin of this software must not be misrepresented; you must not   */
  24 /*    claim that you wrote the original software. If you use this software   */
  25 /*    in a product, an acknowledgment in the product documentation would be  */
  26 /*    appreciated but is not required.                                       */
  27 /* 2. Altered source versions must be plainly marked as such, and must not   */
  28 /*    be misrepresented as being the original software.                      */
  29 /* 3. This notice may not be removed or altered from any source              */
  30 /*    distribution.                                                          */
  31 /*                                                                           */
  32 /*****************************************************************************/
  33
  34
  35
  36 #ifndef CPUCORE_H
  37 #define CPUCORE_H
  38
  39
  40
  41 /*****************************************************************************/
  42 /*                                   Data                                    */
  43 /*****************************************************************************/
  44
  45
  46
  47 /* Registers */
  48 extern unsigned char    AC;             /* Accumulator */
  49 extern unsigned char    XR;             /* X register */
  50 extern unsigned char    YR;             /* Y register */
  51 extern unsigned char    SR;             /* Status register */
  52 extern unsigned char    SP;             /* Stackpointer */
  53 extern unsigned         PC;             /* Program counter */
  54
  55 /* Status register bits */
  56 #define CF      0x01            /* Carry flag */
  57 #define ZF      0x02            /* Zero flag */
  58 #define IF      0x04            /* Interrupt flag */
  59 #define DF      0x08            /* Decimal flag */
  60 #define BF      0x10            /* Break flag */
  61 #define OF      0x40            /* Overflow flag */
  62 #define SF      0x80            /* Sign flag */
  63
  64
  65
  66 /*****************************************************************************/
  67 /*                                   Code                                    */
  68 /*****************************************************************************/
  69
  70
  71
  72 void CPUInit (void);
  73 /* Initialize the CPU */
  74
  75 void Reset (void);
  76 /* Reset the CPU */
  77
  78 void IRQ (void);
  79 /* Generate an IRQ */
  80
  81 void NMI (void);
  82 /* Generate an NMI */
  83
  84 void Break (const char* Format, ...);
  85 /* Stop running and display the given message */
  86
  87 void CPURun (void);
  88 /* Run the CPU */
  89
  90
  91
  92 /* End of cpucore.h */
  93
  94 #endif
  95
  96
  97