git.sur5r.net Git - cc65/blob - include/em/em-kernel.h

   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                                em-kernel.h                                */
   4 /*                                                                           */
   5 /*                       Internally used EM functions                        */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 2002-2003 Ullrich von Bassewitz                                       */
  10 /*               Römerstrasse 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 _EM_KERNEL_H
  37 #define _EM_KERNEL_H
  38
  39
  40
  41 /*****************************************************************************/
  42 /*                                   Data                                    */
  43 /*****************************************************************************/
  44
  45
  46
  47 /* A structure that describes the header of an extended memory driver loaded
  48  * into memory.
  49  */
  50 typedef struct {
  51
  52     /* Driver header */
  53     char                id[3];          /* Contains 0x65, 0x6d, 0x64 ("emd") */
  54     unsigned char       version;        /* Interface version */
  55
  56     /* Jump vectors. Note that these are not C callable */
  57     void*               install;        /* INSTALL routine */
  58     void*               deinstall;      /* DEINSTALL routine */
  59     void*               pagecount;      /* PAGECOUNT routine */
  60     void*               map;            /* MAP routine */
  61     void*               use;            /* USE routine */
  62     void*               mapclean;       /* MAPCLEAN routine */
  63     void*               copyfrom;       /* COPYFROM routine */
  64     void*               copyto;         /* COPYTO routine */
  65
  66 } em_drv_header;
  67
  68
  69
  70 /* EM kernel variables */
  71 extern em_drv_header*   em_drv;         /* Pointer to driver */
  72
  73
  74
  75 /* End of em-kernel.h */
  76 #endif
  77
  78
  79