vtophys.cc revision 11793 
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 "arch/alpha/vtophys.hh"
34
35#include <string>
36
37#include "arch/alpha/ev5.hh"
38#include "base/chunk_generator.hh"
39#include "base/trace.hh"
40#include "cpu/thread_context.hh"
41#include "debug/VtoPhys.hh"
42#include "mem/port_proxy.hh"
43
44using namespace std;
45
46namespace AlphaISA {
47
48PageTableEntry
49kernel_pte_lookup(PortProxy &mem, Addr ptbr, VAddr vaddr)
50{
51    Addr level1_pte = ptbr + vaddr.level1();
52    PageTableEntry level1 = mem.read<uint64_t>(level1_pte);
53    if (!level1.valid()) {
54        DPRINTF(VtoPhys, "level 1 PTE not valid, va = %#\n", vaddr);
55        return 0;
56    }
57
58    Addr level2_pte = level1.paddr() + vaddr.level2();
59    PageTableEntry level2 = mem.read<uint64_t>(level2_pte);
60    if (!level2.valid()) {
61        DPRINTF(VtoPhys, "level 2 PTE not valid, va = %#x\n", vaddr);
62        return 0;
63    }
64
65    Addr level3_pte = level2.paddr() + vaddr.level3();
66    PageTableEntry level3 = mem.read<uint64_t>(level3_pte);
67    if (!level3.valid()) {
68        DPRINTF(VtoPhys, "level 3 PTE not valid, va = %#x\n", vaddr);
69        return 0;
70    }
71    return level3;
72}
73
74Addr
75vtophys(Addr vaddr)
76{
77    Addr paddr = 0;
78    if (IsUSeg(vaddr))
79        DPRINTF(VtoPhys, "vtophys: invalid vaddr %#x", vaddr);
80    else if (IsK0Seg(vaddr))
81        paddr = K0Seg2Phys(vaddr);
82    else
83        panic("vtophys: ptbr is not set on virtual lookup");
84
85    DPRINTF(VtoPhys, "vtophys(%#x) -> %#x\n", vaddr, paddr);
86
87    return paddr;
88}
89
90Addr
91vtophys(ThreadContext *tc, Addr addr)
92{
93    VAddr vaddr = addr;
94    Addr ptbr = tc->readMiscRegNoEffect(IPR_PALtemp20);
95    Addr paddr = 0;
96    //@todo Andrew couldn't remember why he commented some of this code
97    //so I put it back in. Perhaps something to do with gdb debugging?
98    if (PcPAL(vaddr) && (vaddr < PalMax)) {
99        paddr = vaddr & ~ULL(1);
100    } else {
101        if (IsK0Seg(vaddr)) {
102            paddr = K0Seg2Phys(vaddr);
103        } else if (!ptbr) {
104            paddr = vaddr;
105        } else {
106            PageTableEntry pte =
107                kernel_pte_lookup(tc->getPhysProxy(), ptbr, vaddr);
108            if (pte.valid())
109                paddr = pte.paddr() | vaddr.offset();
110        }
111    }
112
113
114    DPRINTF(VtoPhys, "vtophys(%#x) -> %#x\n", vaddr, paddr);
115
116    return paddr;
117}
118
119} // namespace AlphaISA
120