pagetable.hh revision 8902:75b524b64c28 
1/*
2 * Copyright (c) 2010 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder.  You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Copyright (c) 2002-2005 The Regents of The University of Michigan
15 * All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions are
19 * met: redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer;
21 * redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution;
24 * neither the name of the copyright holders nor the names of its
25 * contributors may be used to endorse or promote products derived from
26 * this software without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 *
40 * Authors: Ali Saidi
41 */
42
43#ifndef __ARCH_ARM_PAGETABLE_H__
44#define __ARCH_ARM_PAGETABLE_H__
45
46#include "arch/arm/isa_traits.hh"
47#include "arch/arm/utility.hh"
48#include "arch/arm/vtophys.hh"
49#include "sim/serialize.hh"
50
51namespace ArmISA {
52
53struct VAddr
54{
55    VAddr(Addr a) { panic("not implemented yet."); }
56};
57
58
59// ITB/DTB page table entry
60struct PTE
61{
62    void serialize(std::ostream &os)
63    {
64        panic("Need to implement PTE serialization\n");
65    }
66
67    void unserialize(Checkpoint *cp, const std::string &section)
68    {
69        panic("Need to implement PTE serialization\n");
70    }
71
72};
73
74// ITB/DTB table entry
75struct TlbEntry
76{
77  public:
78    enum MemoryType {
79        StronglyOrdered,
80        Device,
81        Normal
82    };
83    enum DomainType {
84        DomainNoAccess = 0,
85        DomainClient,
86        DomainReserved,
87        DomainManager
88    };
89
90    // Matching variables
91    Addr pfn;
92    Addr size;              // Size of this entry, == Type of TLB Rec
93    Addr vpn;               // Virtual Page Number
94    uint32_t asid;          // Address Space Identifier
95    uint8_t N;              // Number of bits in pagesize
96    bool global;
97    bool valid;
98
99    // Type of memory
100    bool nonCacheable;     // Can we wrap this in mtype?
101    bool sNp;      // Section descriptor
102
103    // Memory Attributes
104    MemoryType mtype;
105    uint8_t innerAttrs;
106    uint8_t outerAttrs;
107    bool shareable;
108    uint32_t attributes;    // Memory attributes formatted for PAR
109
110
111    // Access permissions
112    bool xn;                // Execute Never
113    uint8_t ap;           // Access permissions bits
114    uint8_t domain;       // Access Domain
115
116    //Construct an entry that maps to physical address addr for SE mode
117    TlbEntry(Addr _asn, Addr _vaddr, Addr _paddr)
118    {
119        pfn = _paddr >> PageShift;
120        size = PageBytes - 1;
121        asid = _asn;
122        global = false;
123        valid = true;
124
125        vpn = _vaddr >> PageShift;
126
127        nonCacheable = sNp = false;
128
129        xn = 0;
130        ap = 0; // ???
131        domain = DomainClient; //???
132    }
133
134    TlbEntry()
135    {}
136
137    void
138    updateVaddr(Addr new_vaddr)
139    {
140        vpn = new_vaddr >> PageShift;
141    }
142
143    Addr
144    pageStart()
145    {
146        return pfn << PageShift;
147    }
148
149    bool
150    match(Addr va, uint8_t cid)
151    {
152        Addr v = vpn << N;
153        if (valid && va >= v && va <= v + size && (global || cid == asid))
154            return true;
155        return false;
156    }
157
158    Addr
159    pAddr(Addr va)
160    {
161        return (pfn << N) | (va & size);
162    }
163
164    void
165    serialize(std::ostream &os)
166    {
167        SERIALIZE_SCALAR(pfn);
168        SERIALIZE_SCALAR(size);
169        SERIALIZE_SCALAR(vpn);
170        SERIALIZE_SCALAR(asid);
171        SERIALIZE_SCALAR(N);
172        SERIALIZE_SCALAR(global);
173        SERIALIZE_SCALAR(valid);
174        SERIALIZE_SCALAR(nonCacheable);
175        SERIALIZE_SCALAR(sNp);
176        SERIALIZE_ENUM(mtype);
177        SERIALIZE_SCALAR(innerAttrs);
178        SERIALIZE_SCALAR(outerAttrs);
179        SERIALIZE_SCALAR(shareable);
180        SERIALIZE_SCALAR(attributes);
181        SERIALIZE_SCALAR(xn);
182        SERIALIZE_SCALAR(ap);
183        SERIALIZE_SCALAR(domain);
184    }
185    void
186    unserialize(Checkpoint *cp, const std::string &section)
187    {
188        UNSERIALIZE_SCALAR(pfn);
189        UNSERIALIZE_SCALAR(size);
190        UNSERIALIZE_SCALAR(vpn);
191        UNSERIALIZE_SCALAR(asid);
192        UNSERIALIZE_SCALAR(N);
193        UNSERIALIZE_SCALAR(global);
194        UNSERIALIZE_SCALAR(valid);
195        UNSERIALIZE_SCALAR(nonCacheable);
196        UNSERIALIZE_SCALAR(sNp);
197        UNSERIALIZE_ENUM(mtype);
198        UNSERIALIZE_SCALAR(innerAttrs);
199        UNSERIALIZE_SCALAR(outerAttrs);
200        UNSERIALIZE_SCALAR(shareable);
201        UNSERIALIZE_SCALAR(attributes);
202        UNSERIALIZE_SCALAR(xn);
203        UNSERIALIZE_SCALAR(ap);
204        UNSERIALIZE_SCALAR(domain);
205    }
206
207};
208
209
210
211}
212#endif // __ARCH_ARM_PAGETABLE_H__
213
214