/[gxemul]/trunk/src/devices/dev_zero.c
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revision 21 by dpavlin, Mon Oct 8 16:19:23 2007 UTC revision 22 by dpavlin, Mon Oct 8 16:19:37 2007 UTC
# Line 1  Line 1 
1  /*  /*
2   *  Copyright (C) 2004-2005  Anders Gavare.  All rights reserved.   *  Copyright (C) 2004-2006  Anders Gavare.  All rights reserved.
3   *   *
4   *  Redistribution and use in source and binary forms, with or without   *  Redistribution and use in source and binary forms, with or without
5   *  modification, are permitted provided that the following conditions are met:   *  modification, are permitted provided that the following conditions are met:
# Line 25  Line 25 
25   *  SUCH DAMAGE.   *  SUCH DAMAGE.
26   *     *  
27   *   *
28   *  $Id: dev_zero.c,v 1.2 2005/11/13 00:14:10 debug Exp $   *  $Id: dev_zero.c,v 1.5 2006/02/09 20:02:59 debug Exp $
29   *     *  
30   *  A simple device which returns zero for all reads, and discards all writes.   *  A simple device which returns zero for all reads, and discards all writes.
31   */   */
# Line 40  Line 40 
40  #include "misc.h"  #include "misc.h"
41    
42    
43  /*  DEVICE_ACCESS(zero)
  *  dev_zero_access():  
  *  
  *  Returns 1 if ok, 0 on error.  
  */  
 int dev_zero_access(struct cpu *cpu, struct memory *mem,  
         uint64_t relative_addr, unsigned char *data, size_t len,  
         int writeflag, void *extra)  
44  {  {
45          if (writeflag == MEM_READ) {          if (writeflag == MEM_READ) {
46                  int i;                  unsigned int i;
47                  for (i=0; i<len; i++)                  for (i=0; i<len; i++)
48                          data[i] = 0;                          data[i] = 0;
49          }          }
# Line 59  int dev_zero_access(struct cpu *cpu, str Line 52  int dev_zero_access(struct cpu *cpu, str
52  }  }
53    
54    
55  /*  DEVINIT(zero)
  *  devinit_zero():  
  */  
 int devinit_zero(struct devinit *devinit)  
56  {  {
57          memory_device_register(devinit->machine->memory,          memory_device_register(devinit->machine->memory,
58              devinit->name, devinit->addr, devinit->len,              devinit->name, devinit->addr, devinit->len,
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