system.cc revision 4762:c94e103c83ad 
1/*
2 * Copyright (c) 2004-2005 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: Ben Nash
29 */
30
31/**
32 * @file
33 * Modifications for the FreeBSD kernel.
34 * Based on kern/linux/linux_system.cc.
35 *
36 */
37
38#include "arch/alpha/freebsd/system.hh"
39#include "arch/alpha/system.hh"
40#include "arch/isa_traits.hh"
41#include "arch/vtophys.hh"
42#include "base/loader/symtab.hh"
43#include "cpu/thread_context.hh"
44#include "mem/physical.hh"
45#include "mem/port.hh"
46#include "sim/byteswap.hh"
47
48#define TIMER_FREQUENCY 1193180
49
50using namespace std;
51using namespace AlphaISA;
52
53FreebsdAlphaSystem::FreebsdAlphaSystem(Params *p)
54    : AlphaSystem(p)
55{
56    /**
57     * Any time DELAY is called just skip the function.
58     * Shouldn't we actually emulate the delay?
59     */
60    skipDelayEvent = addKernelFuncEvent<SkipFuncEvent>("DELAY");
61    skipCalibrateClocks =
62        addKernelFuncEvent<SkipCalibrateClocksEvent>("calibrate_clocks");
63}
64
65
66FreebsdAlphaSystem::~FreebsdAlphaSystem()
67{
68    delete skipDelayEvent;
69    delete skipCalibrateClocks;
70}
71
72
73void
74FreebsdAlphaSystem::doCalibrateClocks(ThreadContext *tc)
75{
76    Addr ppc_vaddr = 0;
77    Addr timer_vaddr = 0;
78
79    ppc_vaddr = (Addr)tc->readIntReg(ArgumentReg1);
80    timer_vaddr = (Addr)tc->readIntReg(ArgumentReg2);
81
82    virtPort.write(ppc_vaddr, (uint32_t)Clock::Frequency);
83    virtPort.write(timer_vaddr, (uint32_t)TIMER_FREQUENCY);
84}
85
86
87void
88FreebsdAlphaSystem::SkipCalibrateClocksEvent::process(ThreadContext *tc)
89{
90    SkipFuncEvent::process(tc);
91    ((FreebsdAlphaSystem *)tc->getSystemPtr())->doCalibrateClocks(tc);
92}
93
94FreebsdAlphaSystem *
95FreebsdAlphaSystemParams::create()
96{
97    return new FreebsdAlphaSystem(this);
98}
99