pagetable.hh revision 5877:9fe574944f31 
1/*
2 * Copyright (c) 2002-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * 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 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Nathan Binkert
29 *          Steve Reinhardt
30 */
31
32#ifndef __ARCH_ALPHA_PAGETABLE_H__
33#define __ARCH_ALPHA_PAGETABLE_H__
34
35#include "arch/alpha/isa_traits.hh"
36#include "arch/alpha/utility.hh"
37#include "config/full_system.hh"
38
39namespace AlphaISA {
40
41struct VAddr
42{
43    static const int ImplBits = 43;
44    static const Addr ImplMask = (ULL(1) << ImplBits) - 1;
45    static const Addr UnImplMask = ~ImplMask;
46
47    Addr addr;
48
49    VAddr(Addr a) : addr(a) {}
50    operator Addr() const { return addr; }
51    const VAddr &operator=(Addr a) { addr = a; return *this; }
52
53    Addr vpn() const { return (addr & ImplMask) >> PageShift; }
54    Addr page() const { return addr & PageMask; }
55    Addr offset() const { return addr & PageOffset; }
56
57    Addr level3() const
58    { return PteAddr(addr >> PageShift); }
59    Addr level2() const
60    { return PteAddr(addr >> (NPtePageShift + PageShift)); }
61    Addr level1() const
62    { return PteAddr(addr >> (2 * NPtePageShift + PageShift)); }
63};
64
65struct PageTableEntry
66{
67    PageTableEntry(uint64_t e) : entry(e) {}
68    uint64_t entry;
69    operator uint64_t() const { return entry; }
70    const PageTableEntry &operator=(uint64_t e) { entry = e; return *this; }
71    const PageTableEntry &operator=(const PageTableEntry &e)
72    { entry = e.entry; return *this; }
73
74    Addr _pfn()  const { return (entry >> 32) & 0xffffffff; }
75    Addr _sw()   const { return (entry >> 16) & 0xffff; }
76    int  _rsv0() const { return (entry >> 14) & 0x3; }
77    bool _uwe()  const { return (entry >> 13) & 0x1; }
78    bool _kwe()  const { return (entry >> 12) & 0x1; }
79    int  _rsv1() const { return (entry >> 10) & 0x3; }
80    bool _ure()  const { return (entry >>  9) & 0x1; }
81    bool _kre()  const { return (entry >>  8) & 0x1; }
82    bool _nomb() const { return (entry >>  7) & 0x1; }
83    int  _gh()   const { return (entry >>  5) & 0x3; }
84    bool _asm_()  const { return (entry >>  4) & 0x1; }
85    bool _foe()  const { return (entry >>  3) & 0x1; }
86    bool _fow()  const { return (entry >>  2) & 0x1; }
87    bool _for()  const { return (entry >>  1) & 0x1; }
88    bool valid() const { return (entry >>  0) & 0x1; }
89
90    Addr paddr() const { return _pfn() << PageShift; }
91};
92
93// ITB/DTB table entry
94struct TlbEntry
95{
96    Addr tag;               // virtual page number tag
97    Addr ppn;               // physical page number
98    uint8_t xre;            // read permissions - VMEM_PERM_* mask
99    uint8_t xwe;            // write permissions - VMEM_PERM_* mask
100    uint8_t asn;            // address space number
101    bool asma;              // address space match
102    bool fonr;              // fault on read
103    bool fonw;              // fault on write
104    bool valid;             // valid page table entry
105
106
107    //Construct an entry that maps to physical address addr.
108    TlbEntry(Addr _asn, Addr _vaddr, Addr _paddr)
109    {
110        VAddr vaddr(_vaddr);
111        VAddr paddr(_paddr);
112        tag = vaddr.vpn();
113        ppn = paddr.vpn();
114        xre = 15;
115        xwe = 15;
116        asn = _asn;
117        asma = false;
118        fonr = false;
119        fonw = false;
120        valid = true;
121    }
122
123    TlbEntry()
124    {}
125
126    void
127    updateVaddr(Addr new_vaddr)
128    {
129        VAddr vaddr(new_vaddr);
130        tag = vaddr.vpn();
131    }
132
133    Addr
134    pageStart()
135    {
136        return ppn << PageShift;
137    }
138
139    void serialize(std::ostream &os);
140    void unserialize(Checkpoint *cp, const std::string &section);
141};
142
143} // namespace AlphaISA
144
145#endif // __ARCH_ALPHA_PAGETABLE_H__
146
147