vtophys.cc revision 5566:3440c9ad49b4 
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 *          Ali Saidi
31 */
32
33#include <string>
34
35#include "arch/alpha/ev5.hh"
36#include "arch/alpha/vtophys.hh"
37#include "base/chunk_generator.hh"
38#include "base/trace.hh"
39#include "cpu/thread_context.hh"
40#include "mem/vport.hh"
41
42using namespace std;
43using namespace AlphaISA;
44
45AlphaISA::PageTableEntry
46AlphaISA::kernel_pte_lookup(FunctionalPort *mem, Addr ptbr, AlphaISA::VAddr vaddr)
47{
48    Addr level1_pte = ptbr + vaddr.level1();
49    AlphaISA::PageTableEntry level1 = mem->read<uint64_t>(level1_pte);
50    if (!level1.valid()) {
51        DPRINTF(VtoPhys, "level 1 PTE not valid, va = %#\n", vaddr);
52        return 0;
53    }
54
55    Addr level2_pte = level1.paddr() + vaddr.level2();
56    AlphaISA::PageTableEntry level2 = mem->read<uint64_t>(level2_pte);
57    if (!level2.valid()) {
58        DPRINTF(VtoPhys, "level 2 PTE not valid, va = %#x\n", vaddr);
59        return 0;
60    }
61
62    Addr level3_pte = level2.paddr() + vaddr.level3();
63    AlphaISA::PageTableEntry level3 = mem->read<uint64_t>(level3_pte);
64    if (!level3.valid()) {
65        DPRINTF(VtoPhys, "level 3 PTE not valid, va = %#x\n", vaddr);
66        return 0;
67    }
68    return level3;
69}
70
71Addr
72AlphaISA::vtophys(Addr vaddr)
73{
74    Addr paddr = 0;
75    if (AlphaISA::IsUSeg(vaddr))
76        DPRINTF(VtoPhys, "vtophys: invalid vaddr %#x", vaddr);
77    else if (AlphaISA::IsK0Seg(vaddr))
78        paddr = AlphaISA::K0Seg2Phys(vaddr);
79    else
80        panic("vtophys: ptbr is not set on virtual lookup");
81
82    DPRINTF(VtoPhys, "vtophys(%#x) -> %#x\n", vaddr, paddr);
83
84    return paddr;
85}
86
87Addr
88AlphaISA::vtophys(ThreadContext *tc, Addr addr)
89{
90    AlphaISA::VAddr vaddr = addr;
91    Addr ptbr = tc->readMiscRegNoEffect(AlphaISA::IPR_PALtemp20);
92    Addr paddr = 0;
93    //@todo Andrew couldn't remember why he commented some of this code
94    //so I put it back in. Perhaps something to do with gdb debugging?
95    if (AlphaISA::PcPAL(vaddr) && (vaddr < AlphaISA::PalMax)) {
96        paddr = vaddr & ~ULL(1);
97    } else {
98        if (AlphaISA::IsK0Seg(vaddr)) {
99            paddr = AlphaISA::K0Seg2Phys(vaddr);
100        } else if (!ptbr) {
101            paddr = vaddr;
102        } else {
103            AlphaISA::PageTableEntry pte =
104                kernel_pte_lookup(tc->getPhysPort(), ptbr, vaddr);
105            if (pte.valid())
106                paddr = pte.paddr() | vaddr.offset();
107        }
108    }
109
110
111    DPRINTF(VtoPhys, "vtophys(%#x) -> %#x\n", vaddr, paddr);
112
113    return paddr;
114}
115
116