1/* Memory attributes support, for GDB.
2   Copyright 2001 Free Software Foundation, Inc.
3
4   This file is part of GDB.
5
6   This program is free software; you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by
8   the Free Software Foundation; either version 2 of the License, or
9   (at your option) any later version.
10
11   This program is distributed in the hope that it will be useful,
12   but WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14   GNU General Public License for more details.
15
16   You should have received a copy of the GNU General Public License
17   along with this program; if not, write to the Free Software
18   Foundation, Inc., 59 Temple Place - Suite 330,
19   Boston, MA 02111-1307, USA.  */
20
21#ifndef MEMATTR_H
22#define MEMATTR_H
23
24enum mem_access_mode
25{
26  MEM_RW,			/* read/write */
27  MEM_RO,			/* read only */
28  MEM_WO			/* write only */
29};
30
31enum mem_access_width
32{
33  MEM_WIDTH_UNSPECIFIED,
34  MEM_WIDTH_8,			/*  8 bit accesses */
35  MEM_WIDTH_16,			/* 16  "      "    */
36  MEM_WIDTH_32,			/* 32  "      "    */
37  MEM_WIDTH_64			/* 64  "      "    */
38};
39
40/* The set of all attributes that can be set for a memory region.
41
42   This structure was created so that memory attributes can be passed
43   to target_ functions without exposing the details of memory region
44   list, which would be necessary if these fields were simply added to
45   the mem_region structure.
46
47   FIXME: It would be useful if there was a mechanism for targets to
48   add their own attributes.  For example, the number of wait states. */
49
50struct mem_attrib
51{
52  /* read/write, read-only, or write-only */
53  enum mem_access_mode mode;
54
55  enum mem_access_width width;
56
57  /* enables hardware breakpoints */
58  int hwbreak;
59
60  /* enables host-side caching of memory region data */
61  int cache;
62
63  /* enables memory verification.  after a write, memory is re-read
64     to verify that the write was successful. */
65  int verify;
66};
67
68struct mem_region
69{
70  /* FIXME: memory regions are stored in an unsorted singly-linked
71     list.  This probably won't scale to handle hundreds of memory
72     regions --- that many could be needed to describe the allowed
73     access modes for memory mapped i/o device registers. */
74  struct mem_region *next;
75
76  CORE_ADDR lo;
77  CORE_ADDR hi;
78
79  /* Item number of this memory region. */
80  int number;
81
82  /* Status of this memory region (enabled if non-zero, otherwise disabled) */
83  int enabled_p;
84
85  /* Attributes for this region */
86  struct mem_attrib attrib;
87};
88
89extern struct mem_region *lookup_mem_region(CORE_ADDR);
90
91#endif	/* MEMATTR_H */
92