system.cc revision 8229:78bf55f23338 
1/*
2 * Copyright (c) 2010 ARM Limited
3 * All rights reserved
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder.  You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Copyright (c) 2002-2006 The Regents of The University of Michigan
15 * All rights reserved.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions are
19 * met: redistributions of source code must retain the above copyright
20 * notice, this list of conditions and the following disclaimer;
21 * redistributions in binary form must reproduce the above copyright
22 * notice, this list of conditions and the following disclaimer in the
23 * documentation and/or other materials provided with the distribution;
24 * neither the name of the copyright holders nor the names of its
25 * contributors may be used to endorse or promote products derived from
26 * this software without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
29 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
30 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
31 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
32 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
33 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
34 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
35 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
36 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
37 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
38 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39 *
40 * Authors: Ali Saidi
41 */
42
43#include "arch/arm/linux/atag.hh"
44#include "arch/arm/linux/system.hh"
45#include "arch/arm/isa_traits.hh"
46#include "arch/arm/utility.hh"
47#include "base/loader/object_file.hh"
48#include "base/loader/symtab.hh"
49#include "cpu/thread_context.hh"
50#include "kern/linux/events.hh"
51#include "mem/physical.hh"
52
53using namespace ArmISA;
54using namespace Linux;
55
56LinuxArmSystem::LinuxArmSystem(Params *p)
57    : ArmSystem(p)
58{
59    // Load symbols at physical address, we might not want
60    // to do this perminately, for but early bootup work
61    // it is helpfulp.
62    kernel->loadGlobalSymbols(kernelSymtab, loadAddrMask);
63    kernel->loadGlobalSymbols(debugSymbolTable, loadAddrMask);
64
65    // Setup boot data structure
66    AtagCore *ac = new AtagCore;
67    ac->flags(1); // read-only
68    ac->pagesize(8192);
69    ac->rootdev(0);
70
71    AtagMem *am = new AtagMem;
72    am->memSize(params()->physmem->size());
73    am->memStart(params()->physmem->start());
74
75    AtagCmdline *ad = new AtagCmdline;
76    ad->cmdline(params()->boot_osflags);
77
78    DPRINTF(Loader, "boot command line %d bytes: %s\n", ad->size() <<2, params()->boot_osflags.c_str());
79
80    AtagNone *an = new AtagNone;
81
82    uint32_t size = ac->size() + am->size() + ad->size() + an->size();
83    uint32_t offset = 0;
84    uint8_t *boot_data = new uint8_t[size << 2];
85
86    offset += ac->copyOut(boot_data + offset);
87    offset += am->copyOut(boot_data + offset);
88    offset += ad->copyOut(boot_data + offset);
89    offset += an->copyOut(boot_data + offset);
90
91    DPRINTF(Loader, "Boot atags was %d bytes in total\n", size << 2);
92    DDUMP(Loader, boot_data, size << 2);
93
94    functionalPort->writeBlob(ParamsList, boot_data, size << 2);
95
96#ifndef NDEBUG
97    kernelPanicEvent = addKernelFuncEvent<BreakPCEvent>("panic");
98    if (!kernelPanicEvent)
99        panic("could not find kernel symbol \'panic\'");
100#endif
101
102    // With ARM udelay() is #defined to __udelay
103    Addr addr = 0;
104    if (kernelSymtab->findAddress("__udelay", addr)) {
105        uDelaySkipEvent = new UDelayEvent(&pcEventQueue, "__udelay",
106                fixFuncEventAddr(addr), 1000, 0);
107    } else {
108        panic("couldn't find kernel symbol \'udelay\'");
109    }
110
111    // constant arguments to udelay() have some precomputation done ahead of
112    // time. Constant comes from code.
113    if (kernelSymtab->findAddress("__const_udelay", addr)) {
114        constUDelaySkipEvent = new UDelayEvent(&pcEventQueue, "__const_udelay",
115                fixFuncEventAddr(addr), 1000, 107374);
116    } else {
117        panic("couldn't find kernel symbol \'udelay\'");
118    }
119}
120
121void
122LinuxArmSystem::initState()
123{
124    ArmSystem::initState();
125    ThreadContext *tc = threadContexts[0];
126
127    // Set the initial PC to be at start of the kernel code
128    tc->pcState(tc->getSystemPtr()->kernelEntry & loadAddrMask);
129
130    // Setup the machine type
131    tc->setIntReg(0, 0);
132    tc->setIntReg(1, params()->machine_type);
133    tc->setIntReg(2, ParamsList);
134}
135
136LinuxArmSystem::~LinuxArmSystem()
137{
138    if (uDelaySkipEvent)
139        delete uDelaySkipEvent;
140    if (constUDelaySkipEvent)
141        delete constUDelaySkipEvent;
142}
143
144LinuxArmSystem *
145LinuxArmSystemParams::create()
146{
147    return new LinuxArmSystem(this);
148}
149