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Diffstat (limited to 'src/arch/arm/pagetable.hh')
-rw-r--r-- | src/arch/arm/pagetable.hh | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/src/arch/arm/pagetable.hh b/src/arch/arm/pagetable.hh new file mode 100644 index 000000000..ad3464a63 --- /dev/null +++ b/src/arch/arm/pagetable.hh @@ -0,0 +1,102 @@ +/* + * Copyright (c) 2002-2005 The Regents of The University of Michigan + * Copyright (c) 2007 MIPS Technologies, Inc. + * Copyright (c) 2007-2008 The Florida State University + * 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. + * + * Authors: Nathan Binkert + * Steve Reinhardt + * Jaidev Patwardhan + * Stephen Hines + */ + +#ifndef __ARCH_ARM_PAGETABLE_H__ +#define __ARCH_ARM_PAGETABLE_H__ + +#include "arch/arm/isa_traits.hh" +#include "arch/arm/utility.hh" +#include "arch/arm/vtophys.hh" +#include "config/full_system.hh" + +namespace ArmISA { + + struct VAddr + { + static const int ImplBits = 43; + static const Addr ImplMask = (ULL(1) << ImplBits) - 1; + static const Addr UnImplMask = ~ImplMask; + + VAddr(Addr a) : addr(a) {} + Addr addr; + operator Addr() const { return addr; } + const VAddr &operator=(Addr a) { addr = a; return *this; } + + Addr vpn() const { return (addr & ImplMask) >> PageShift; } + Addr page() const { return addr & Page_Mask; } + Addr offset() const { return addr & PageOffset; } + + Addr level3() const + { return ArmISA::PteAddr(addr >> PageShift); } + Addr level2() const + { return ArmISA::PteAddr(addr >> (NPtePageShift + PageShift)); } + Addr level1() const + { return ArmISA::PteAddr(addr >> (2 * NPtePageShift + PageShift)); } + }; + + // ITB/DTB page table entry + struct PTE + { + Addr Mask; // What parts of the VAddr (from bits 28..11) should be used in translation (includes Mask and MaskX from PageMask) + Addr VPN; // Virtual Page Number (/2) (Includes VPN2 + VPN2X .. bits 31..11 from EntryHi) + uint8_t asid; // Address Space ID (8 bits) // Lower 8 bits of EntryHi + + bool G; // Global Bit - Obtained by an *AND* of EntryLo0 and EntryLo1 G bit + + /* Contents of Entry Lo0 */ + Addr PFN0; // Physical Frame Number - Even + bool D0; // Even entry Dirty Bit + bool V0; // Even entry Valid Bit + uint8_t C0; // Cache Coherency Bits - Even + + /* Contents of Entry Lo1 */ + Addr PFN1; // Physical Frame Number - Odd + bool D1; // Odd entry Dirty Bit + bool V1; // Odd entry Valid Bit + uint8_t C1; // Cache Coherency Bits (3 bits) + + /* The next few variables are put in as optimizations to reduce TLB lookup overheads */ + /* For a given Mask, what is the address shift amount, and what is the OffsetMask */ + int AddrShiftAmount; + int OffsetMask; + + bool Valid() { return (V0 | V1);}; + void serialize(std::ostream &os); + void unserialize(Checkpoint *cp, const std::string §ion); + }; + +}; +#endif // __ARCH_ARM_PAGETABLE_H__ + |