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/*
* Copyright (c) 2002-2005 The Regents of The University of Michigan
* Copyright (c) 2007 MIPS Technologies, Inc.
* Copyright (c) 2020 Barkhausen Institut
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef __ARCH_RISCV_PAGETABLE_H__
#define __ARCH_RISCV_PAGETABLE_H__
#include "base/bitunion.hh"
#include "base/logging.hh"
#include "base/trie.hh"
#include "base/types.hh"
#include "sim/serialize.hh"
namespace RiscvISA {
BitUnion64(SATP)
Bitfield<63, 60> mode;
Bitfield<59, 44> asid;
Bitfield<43, 0> ppn;
EndBitUnion(SATP)
enum AddrXlateMode
{
BARE = 0,
SV39 = 8,
SV48 = 9,
};
// Sv39 paging
const Addr VADDR_BITS = 39;
const Addr LEVEL_BITS = 9;
const Addr LEVEL_MASK = (1 << LEVEL_BITS) - 1;
BitUnion64(PTESv39)
Bitfield<53, 10> ppn;
Bitfield<53, 28> ppn2;
Bitfield<27, 19> ppn1;
Bitfield<18, 10> ppn0;
Bitfield<7> d;
Bitfield<6> a;
Bitfield<5> g;
Bitfield<4> u;
Bitfield<3, 1> perm;
Bitfield<3> x;
Bitfield<2> w;
Bitfield<1> r;
Bitfield<0> v;
EndBitUnion(PTESv39)
struct TlbEntry;
typedef Trie<Addr, TlbEntry> TlbEntryTrie;
struct TlbEntry : public Serializable
{
// The base of the physical page.
Addr paddr;
// The beginning of the virtual page this entry maps.
Addr vaddr;
// The size of the page this represents, in address bits.
unsigned logBytes;
uint16_t asid;
PTESv39 pte;
TlbEntryTrie::Handle trieHandle;
// A sequence number to keep track of LRU.
uint64_t lruSeq;
TlbEntry()
: paddr(0), vaddr(0), logBytes(0), pte(), lruSeq(0)
{}
// Return the page size in bytes
Addr size() const
{
return (static_cast<Addr>(1) << logBytes);
}
void serialize(CheckpointOut &cp) const override;
void unserialize(CheckpointIn &cp) override;
};
};
#endif // __ARCH_RISCV_PAGETABLE_H__