utility.hh revision 4181:6edaeff44647 
1/*
2 * Copyright (c) 2003-2005 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 */
31
32#ifndef __ARCH_ALPHA_UTILITY_HH__
33#define __ARCH_ALPHA_UTILITY_HH__
34
35#include "config/full_system.hh"
36#include "arch/alpha/types.hh"
37#include "arch/alpha/isa_traits.hh"
38#include "arch/alpha/regfile.hh"
39#include "base/misc.hh"
40#include "cpu/thread_context.hh"
41
42namespace AlphaISA
43{
44
45    static inline bool
46    inUserMode(ThreadContext *tc)
47    {
48        return (tc->readMiscRegNoEffect(AlphaISA::IPR_DTB_CM) & 0x18) != 0;
49    }
50
51    enum PredecodeResult {
52        MoreBytes = 1,
53        ExtMIReady = 2
54    };
55
56    static inline unsigned int
57    predecode(ExtMachInst & ext_inst, Addr pc, MachInst inst, ThreadContext *) {
58        ext_inst = inst;
59#if FULL_SYSTEM
60        if (pc && 0x1)
61            ext_inst|=(static_cast<ExtMachInst>(pc & 0x1) << 32);
62#endif
63        return MoreBytes | ExtMIReady;
64    }
65
66    inline bool isCallerSaveIntegerRegister(unsigned int reg) {
67        panic("register classification not implemented");
68        return (reg >= 1 && reg <= 8 || reg >= 22 && reg <= 25 || reg == 27);
69    }
70
71    inline bool isCalleeSaveIntegerRegister(unsigned int reg) {
72        panic("register classification not implemented");
73        return (reg >= 9 && reg <= 15);
74    }
75
76    inline bool isCallerSaveFloatRegister(unsigned int reg) {
77        panic("register classification not implemented");
78        return false;
79    }
80
81    inline bool isCalleeSaveFloatRegister(unsigned int reg) {
82        panic("register classification not implemented");
83        return false;
84    }
85
86    inline Addr alignAddress(const Addr &addr,
87                                         unsigned int nbytes) {
88        return (addr & ~(nbytes - 1));
89    }
90
91    // Instruction address compression hooks
92    inline Addr realPCToFetchPC(const Addr &addr) {
93        return addr;
94    }
95
96    inline Addr fetchPCToRealPC(const Addr &addr) {
97        return addr;
98    }
99
100    // the size of "fetched" instructions (not necessarily the size
101    // of real instructions for PISA)
102    inline size_t fetchInstSize() {
103        return sizeof(MachInst);
104    }
105
106    inline MachInst makeRegisterCopy(int dest, int src) {
107        panic("makeRegisterCopy not implemented");
108        return 0;
109    }
110
111    // Machine operations
112
113    void saveMachineReg(AnyReg &savereg, const RegFile &reg_file,
114                               int regnum);
115
116    void restoreMachineReg(RegFile &regs, const AnyReg &reg,
117                                  int regnum);
118
119    /**
120     * Function to insure ISA semantics about 0 registers.
121     * @param tc The thread context.
122     */
123    template <class TC>
124    void zeroRegisters(TC *tc);
125
126    // Alpha IPR register accessors
127    inline bool PcPAL(Addr addr) { return addr & 0x3; }
128#if FULL_SYSTEM
129
130    ////////////////////////////////////////////////////////////////////////
131    //
132    //  Translation stuff
133    //
134
135    inline Addr PteAddr(Addr a) { return (a & PteMask) << PteShift; }
136
137    // User Virtual
138    inline bool IsUSeg(Addr a) { return USegBase <= a && a <= USegEnd; }
139
140    // Kernel Direct Mapped
141    inline bool IsK0Seg(Addr a) { return K0SegBase <= a && a <= K0SegEnd; }
142    inline Addr K0Seg2Phys(Addr addr) { return addr & ~K0SegBase; }
143
144    // Kernel Virtual
145    inline bool IsK1Seg(Addr a) { return K1SegBase <= a && a <= K1SegEnd; }
146
147    inline Addr
148    TruncPage(Addr addr)
149    { return addr & ~(PageBytes - 1); }
150
151    inline Addr
152    RoundPage(Addr addr)
153    { return (addr + PageBytes - 1) & ~(PageBytes - 1); }
154
155    void initCPU(ThreadContext *tc, int cpuId);
156    void initIPRs(ThreadContext *tc, int cpuId);
157
158    /**
159     * Function to check for and process any interrupts.
160     * @param tc The thread context.
161     */
162    template <class TC>
163    void processInterrupts(TC *tc);
164#endif
165
166} // namespace AlphaISA
167
168#endif
169