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 38namespace AlphaISA { 39 40struct VAddr 41{ 42 static const int ImplBits = 43; 43 static const Addr ImplMask = (ULL(1) << ImplBits) - 1; 44 static const Addr UnImplMask = ~ImplMask; 45 46 Addr addr; 47 48 VAddr(Addr a) : addr(a) {} 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 PteAddr(addr >> PageShift); } 58 Addr level2() const 59 { return PteAddr(addr >> (NPtePageShift + PageShift)); } 60 Addr level1() const 61 { return PteAddr(addr >> (2 * NPtePageShift + PageShift)); } 62}; 63 64struct 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 table entry 93struct TlbEntry : public Serializable 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 104 105 106 //Construct an entry that maps to physical address addr. 107 TlbEntry(Addr _asn, Addr _vaddr, Addr _paddr, 108 bool uncacheable, bool read_only) 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 if (uncacheable || read_only) 122 warn("Alpha TlbEntry does not support uncacheable" 123 " or read-only mappings\n"); 124 } 125 126 TlbEntry() 127 : tag(0), ppn(0), xre(0), xwe(0), asn(0), 128 asma(false), fonr(0), fonw(0), valid(0) 129 { 130 } 131 132 void 133 updateVaddr(Addr new_vaddr) 134 { 135 VAddr vaddr(new_vaddr); 136 tag = vaddr.vpn(); 137 } 138 139 Addr 140 pageStart() 141 { 142 return ppn << PageShift; 143 } 144 145 void serialize(CheckpointOut &cp) const override; 146 void unserialize(CheckpointIn &cp) override; 147}; 148 149} // namespace AlphaISA 150 151#endif // __ARCH_ALPHA_PAGETABLE_H__ 152 153