summaryrefslogtreecommitdiff
path: root/src/arch/arm/isa_traits.hh
blob: 8be2bf04ab325d7f3161fa6c7a46f2f8e232dc9e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
/*
 * Copyright (c) 2010, 2012 ARM Limited
 * All rights reserved
 *
 * The license below extends only to copyright in the software and shall
 * not be construed as granting a license to any other intellectual
 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
 * unmodified and in its entirety in all distributions of the software,
 * modified or unmodified, in source code or in binary form.
 *
 * Copyright (c) 2003-2005 The Regents of The University of Michigan
 * 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: Gabe Black
 *          Stephen Hines
 */

#ifndef __ARCH_ARM_ISA_TRAITS_HH__
#define __ARCH_ARM_ISA_TRAITS_HH__

#include "arch/arm/types.hh"
#include "base/types.hh"
#include "cpu/static_inst_fwd.hh"

namespace LittleEndianGuest {}

namespace ArmISA
{
    using namespace LittleEndianGuest;

    StaticInstPtr decodeInst(ExtMachInst);

    // ARM DOES NOT have a delay slot
    #define ISA_HAS_DELAY_SLOT 0

    const Addr PageShift = 12;
    const Addr PageBytes = ULL(1) << PageShift;
    const Addr Page_Mask = ~(PageBytes - 1);
    const Addr PageOffset = PageBytes - 1;


    ////////////////////////////////////////////////////////////////////////
    //
    //  Translation stuff
    //

    const Addr PteShift = 3;
    const Addr NPtePageShift = PageShift - PteShift;
    const Addr NPtePage = ULL(1) << NPtePageShift;
    const Addr PteMask = NPtePage - 1;

    //// All 'Mapped' segments go through the TLB
    //// All other segments are translated by dropping the MSB, to give
    //// the corresponding physical address
    // User Segment - Mapped
    const Addr USegBase = ULL(0x0);
    const Addr USegEnd = ULL(0x7FFFFFFF);

    const unsigned VABits = 32;
    const unsigned PABits = 32; // Is this correct?
    const Addr VAddrImplMask = (ULL(1) << VABits) - 1;
    const Addr VAddrUnImplMask = ~VAddrImplMask;
    inline Addr VAddrImpl(Addr a) { return a & VAddrImplMask; }
    inline Addr VAddrVPN(Addr a) { return a >> ArmISA::PageShift; }
    inline Addr VAddrOffset(Addr a) { return a & ArmISA::PageOffset; }

    const Addr PAddrImplMask = (ULL(1) << PABits) - 1;

    // Max. physical address range in bits supported by the architecture
    const unsigned MaxPhysAddrRange = 48;

    // return a no-op instruction... used for instruction fetch faults
    const ExtMachInst NoopMachInst = 0x01E320F000ULL;

    const int MachineBytes = 4;

    const uint32_t HighVecs = 0xFFFF0000;

    // Memory accesses cannot be unaligned
    const bool HasUnalignedMemAcc = true;

    const bool CurThreadInfoImplemented = false;
    const int CurThreadInfoReg = -1;

    enum InterruptTypes
    {
        INT_RST,
        INT_ABT,
        INT_IRQ,
        INT_FIQ,
        INT_SEV, // Special interrupt for recieving SEV's
        INT_VIRT_IRQ,
        INT_VIRT_FIQ,
        NumInterruptTypes
    };
} // namespace ArmISA

using namespace ArmISA;

#endif // __ARCH_ARM_ISA_TRAITS_HH__