init_mem.c

上课老师给的8086仿真器

/***********************************************************************/
/*  This file is part of the C51 Compiler package                      */
/*  Copyright KEIL ELEKTRONIK GmbH 1993                                */
/***********************************************************************/
/*                                                                     */
/*  INIT_MEM.C:                                                        */
/*                                                                     */
/*  To translate this file use C51 with the following invocation:      */
/*                                                                     */
/*     C51 INIT_MEM.C <memory model>                                   */
/*                                                                     */
/*  To link the modified INIT_MEM.OBJ file to your application use the */
/*  following L51 invocation:                                          */
/*                                                                     */
/*     L51 <your object file list>, INIT_MEM.OBJ <controls>            */
/*                                                                     */
/***********************************************************************/

struct mem  {
  struct mem xdata *next;
  struct mem xdata *prev;
  unsigned int       len;
  unsigned char      mem[1];
};

struct mem xdata *__mp__;

void init_mempool (struct mem xdata *p, unsigned int size)  {
  if (!p)  { p = (void xdata *) p + 1; size--; }
  __mp__ = p;
  p->next = ((void xdata *) p) + size - (sizeof (struct mem) - 1);
  p->next->next = (void xdata *) 0;
  p->prev       = (void xdata *) 0;
  p->len        = 0;
}