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

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                 memory.h                                  */
   4 /*                                                                           */
   5 /*                  Memory subsystem for the 6502 simulator                  */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 2002-2012, Ullrich von Bassewitz                                      */
  10 /*                Roemerstrasse 52                                           */
  11 /*                D-70794 Filderstadt                                        */
  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 MEMORY_H
  37 #define MEMORY_H
  38
  39
  40
  41 /*****************************************************************************/
  42 /*                                   Data                                    */
  43 /*****************************************************************************/
  44
  45
  46
  47 /* Forwards */
  48 struct ChipInstance;
  49
  50 /* Memory size of the CPU */
  51 extern unsigned MemSize;
  52
  53
  54
  55 /*****************************************************************************/
  56 /*                                   Code                                    */
  57 /*****************************************************************************/
  58
  59
  60
  61 void MemWriteByte (unsigned Addr, unsigned char Val);
  62 /* Write a byte to a memory location */
  63
  64 unsigned char MemReadByte (unsigned Addr);
  65 /* Read a byte from a memory location */
  66
  67 unsigned MemReadWord (unsigned Addr);
  68 /* Read a word from a memory location */
  69
  70 unsigned MemReadZPWord (unsigned char Addr);
  71 /* Read a word from the zero page. This function differs from ReadMemW in that
  72  * the read will always be in the zero page, even in case of an address
  73  * overflow.
  74  */
  75
  76 void MemAssignChip (const struct ChipInstance* CI, unsigned Addr, unsigned Range);
  77 /* Assign a chip instance to memory locations */
  78
  79 const struct ChipInstance* MemGetChip (unsigned Addr);
  80 /* Get the chip that is located at the given address (may return NULL). */
  81
  82 void MemInit (void);
  83 /* Initialize the memory subsystem */
  84
  85
  86
  87 /* End of memory.h */
  88
  89 #endif
  90
  91
  92
  93