dev_zero.cc Source File

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dev_zero.cc
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1 /*
2  * Copyright (C) 2004-2009 Anders Gavare. All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions are met:
6  *
7  * 1. Redistributions of source code must retain the above copyright
8  * notice, this list of conditions and the following disclaimer.
9  * 2. Redistributions in binary form must reproduce the above copyright
10  * notice, this list of conditions and the following disclaimer in the
11  * documentation and/or other materials provided with the distribution.
12  * 3. The name of the author may not be used to endorse or promote products
13  * derived from this software without specific prior written permission.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  *
27  *
28  * COMMENT: A simple device which returns zero for reads, discards all writes
29  */
30 
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <string.h>
34 
35 #include "device.h"
36 #include "machine.h"
37 #include "memory.h"
38 #include "misc.h"
39 
40 
42 {
43  if (writeflag == MEM_READ) {
44  size_t i;
45  for (i=0; i<len; i++)
46  data[i] = 0;
47  }
48 
49  return 1;
50 }
51 
52 
53 DEVINIT(zero)
54 {
57  dev_zero_access, NULL, DM_DEFAULT, NULL);
58 
59  return 1;
60 }
61 
DEVICE_ACCESS
DEVICE_ACCESS(zero)
Definition: dev_zero.cc:41
data
u_short data
Definition: siireg.h:79
devinit::addr
uint64_t addr
Definition: device.h:46
memory_device_register
void memory_device_register(struct memory *mem, const char *, uint64_t baseaddr, uint64_t len, int(*f)(struct cpu *, struct memory *, uint64_t, unsigned char *, size_t, int, void *), void *extra, int flags, unsigned char *dyntrans_data)
Definition: memory.cc:339
MEM_READ
#define MEM_READ
Definition: memory.h:116
DM_DEFAULT
#define DM_DEFAULT
Definition: memory.h:130
devinit::machine
struct machine * machine
Definition: device.h:41
devinit::len
uint64_t len
Definition: device.h:48
device.h
misc.h
machine.h
devinit::name
char * name
Definition: device.h:43
devinit
Definition: device.h:40
machine::memory
struct memory * memory
Definition: machine.h:126
DEVINIT
DEVINIT(zero)
Definition: dev_zero.cc:53
memory.h

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