pagetable.hh revision 2984 
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
41#if FULL_SYSTEM
42    struct VAddr
43    {
44        static const int ImplBits = 43;
45        static const Addr ImplMask = (ULL(1) << ImplBits) - 1;
46        static const Addr UnImplMask = ~ImplMask;
47
48        VAddr(Addr a) : addr(a) {}
49        Addr addr;
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 AlphaISA::PteAddr(addr >> PageShift); }
59        Addr level2() const
60        { return AlphaISA::PteAddr(addr >> NPtePageShift + PageShift); }
61        Addr level1() const
62        { return AlphaISA::PteAddr(addr >> 2 * NPtePageShift + PageShift); }
63    };
64
65    struct 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 page table entry
94    struct PTE
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        void serialize(std::ostream &os);
107        void unserialize(Checkpoint *cp, const std::string &section);
108    };
109#endif
110};
111#endif // __ARCH_ALPHA_PAGETABLE_H__
112
113