pagetable.hh revision 3895:5e8f0e3aeca2 
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    struct 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        VAddr(Addr a) : addr(a) {}
48        Addr addr;
49        operator Addr() const { return addr; }
50        const VAddr &operator=(Addr a) { addr = a; return *this; }
51
52        Addr vpn() const { return (addr & ImplMask) >> PageShift; }
53        Addr page() const { return addr & PageMask; }
54        Addr offset() const { return addr & PageOffset; }
55
56        Addr level3() const
57        { return AlphaISA::PteAddr(addr >> PageShift); }
58        Addr level2() const
59        { return AlphaISA::PteAddr(addr >> NPtePageShift + PageShift); }
60        Addr level1() const
61        { return AlphaISA::PteAddr(addr >> 2 * NPtePageShift + PageShift); }
62    };
63
64    struct PageTableEntry
65    {
66        PageTableEntry(uint64_t e) : entry(e) {}
67        uint64_t entry;
68        operator uint64_t() const { return entry; }
69        const PageTableEntry &operator=(uint64_t e) { entry = e; return *this; }
70        const PageTableEntry &operator=(const PageTableEntry &e)
71        { entry = e.entry; return *this; }
72
73        Addr _pfn()  const { return (entry >> 32) & 0xffffffff; }
74        Addr _sw()   const { return (entry >> 16) & 0xffff; }
75        int  _rsv0() const { return (entry >> 14) & 0x3; }
76        bool _uwe()  const { return (entry >> 13) & 0x1; }
77        bool _kwe()  const { return (entry >> 12) & 0x1; }
78        int  _rsv1() const { return (entry >> 10) & 0x3; }
79        bool _ure()  const { return (entry >>  9) & 0x1; }
80        bool _kre()  const { return (entry >>  8) & 0x1; }
81        bool _nomb() const { return (entry >>  7) & 0x1; }
82        int  _gh()   const { return (entry >>  5) & 0x3; }
83        bool _asm_()  const { return (entry >>  4) & 0x1; }
84        bool _foe()  const { return (entry >>  3) & 0x1; }
85        bool _fow()  const { return (entry >>  2) & 0x1; }
86        bool _for()  const { return (entry >>  1) & 0x1; }
87        bool valid() const { return (entry >>  0) & 0x1; }
88
89        Addr paddr() const { return _pfn() << PageShift; }
90    };
91
92    // ITB/DTB page table entry
93    struct PTE
94    {
95        Addr tag;			// virtual page number tag
96        Addr ppn;			// physical page number
97        uint8_t xre;		// read permissions - VMEM_PERM_* mask
98        uint8_t xwe;		// write permissions - VMEM_PERM_* mask
99        uint8_t asn;		// address space number
100        bool asma;			// address space match
101        bool fonr;			// fault on read
102        bool fonw;			// fault on write
103        bool valid;			// valid page table entry
104
105        void serialize(std::ostream &os);
106        void unserialize(Checkpoint *cp, const std::string &section);
107    };
108
109};
110#endif // __ARCH_ALPHA_PAGETABLE_H__
111
112