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/*
* Copyright (c) 2002-2005 The Regents of The University of Michigan
* 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
* Ali Saidi
*/
#include <string>
#include "arch/alpha/ev5.hh"
#include "arch/alpha/vtophys.hh"
#include "base/chunk_generator.hh"
#include "base/trace.hh"
#include "cpu/thread_context.hh"
#include "mem/vport.hh"
using namespace std;
using namespace AlphaISA;
AlphaISA::PageTableEntry
AlphaISA::kernel_pte_lookup(FunctionalPort *mem, Addr ptbr, AlphaISA::VAddr vaddr)
{
Addr level1_pte = ptbr + vaddr.level1();
AlphaISA::PageTableEntry level1 = mem->read<uint64_t>(level1_pte);
if (!level1.valid()) {
DPRINTF(VtoPhys, "level 1 PTE not valid, va = %#\n", vaddr);
return 0;
}
Addr level2_pte = level1.paddr() + vaddr.level2();
AlphaISA::PageTableEntry level2 = mem->read<uint64_t>(level2_pte);
if (!level2.valid()) {
DPRINTF(VtoPhys, "level 2 PTE not valid, va = %#x\n", vaddr);
return 0;
}
Addr level3_pte = level2.paddr() + vaddr.level3();
AlphaISA::PageTableEntry level3 = mem->read<uint64_t>(level3_pte);
if (!level3.valid()) {
DPRINTF(VtoPhys, "level 3 PTE not valid, va = %#x\n", vaddr);
return 0;
}
return level3;
}
Addr
AlphaISA::vtophys(Addr vaddr)
{
Addr paddr = 0;
if (AlphaISA::IsUSeg(vaddr))
DPRINTF(VtoPhys, "vtophys: invalid vaddr %#x", vaddr);
else if (AlphaISA::IsK0Seg(vaddr))
paddr = AlphaISA::K0Seg2Phys(vaddr);
else
panic("vtophys: ptbr is not set on virtual lookup");
DPRINTF(VtoPhys, "vtophys(%#x) -> %#x\n", vaddr, paddr);
return paddr;
}
Addr
AlphaISA::vtophys(ThreadContext *tc, Addr addr)
{
AlphaISA::VAddr vaddr = addr;
Addr ptbr = tc->readMiscRegNoEffect(AlphaISA::IPR_PALtemp20);
Addr paddr = 0;
//@todo Andrew couldn't remember why he commented some of this code
//so I put it back in. Perhaps something to do with gdb debugging?
if (AlphaISA::PcPAL(vaddr) && (vaddr < EV5::PalMax)) {
paddr = vaddr & ~ULL(1);
} else {
if (AlphaISA::IsK0Seg(vaddr)) {
paddr = AlphaISA::K0Seg2Phys(vaddr);
} else if (!ptbr) {
paddr = vaddr;
} else {
AlphaISA::PageTableEntry pte =
kernel_pte_lookup(tc->getPhysPort(), ptbr, vaddr);
if (pte.valid())
paddr = pte.paddr() | vaddr.offset();
}
}
DPRINTF(VtoPhys, "vtophys(%#x) -> %#x\n", vaddr, paddr);
return paddr;
}
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