simple_thread.cc revision 2 
1/*
2 * Copyright (c) 2003 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
29#include <string>
30
31#include "base_cpu.hh"
32#include "exec_context.hh"
33
34#ifdef FULL_SYSTEM
35#include "system.hh"
36#else
37#include "prog.hh"
38#endif
39
40using namespace std;
41
42// constructor
43#ifdef FULL_SYSTEM
44ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num, System *_sys,
45                         AlphaItb *_itb, AlphaDtb *_dtb,
46                         FunctionalMemory *_mem, int _cpu_id)
47    : kernelStats(this, _cpu), cpu(_cpu), thread_num(_thread_num), mem(_mem),
48      itb(_itb), dtb(_dtb), cpu_id(_cpu_id), system(_sys),
49      memCtrl(_sys->memCtrl), physmem(_sys->physmem)
50{
51    memset(&regs, 0, sizeof(RegFile));
52    _status = Active;
53    func_exe_insn = 0;
54    storeCondFailures = 0;
55    system->registerExecContext(this);
56}
57#else
58ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num,
59                         Process *_process, int _asid)
60    : cpu(_cpu), thread_num(_thread_num), process(_process), asid (_asid)
61{
62
63    // Register with process object. Our 'active' will be set by the
64    // process iff we're the initial context.  Others are reserved for
65    // dynamically created threads.
66    process->registerExecContext(this);
67
68    mem = process->getMemory();
69
70    func_exe_insn = 0;
71    storeCondFailures = 0;
72}
73
74ExecContext::ExecContext(BaseCPU *_cpu, int _thread_num,
75                         FunctionalMemory *_mem, int _asid)
76    : cpu(_cpu), thread_num(_thread_num), process(NULL), mem(_mem),
77      asid(_asid)
78{
79}
80#endif
81
82void
83ExecContext::setStatus(Status new_status)
84{
85#ifdef FULL_SYSTEM
86    if (status() == new_status)
87        return;
88
89    // Don't change the status from active if there are pending interrupts
90    if (new_status == Suspended && cpu->check_interrupts()) {
91        assert(status() == Active);
92        return;
93    }
94#endif
95
96    _status = new_status;
97    cpu->execCtxStatusChg();
98}
99
100void
101ExecContext::regStats(const string &name)
102{
103#ifdef FULL_SYSTEM
104    kernelStats.regStats(name + ".kern");
105#endif
106}
107