system.cc revision 8299:64a938a8b7fc 
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 <iostream>
44
45#include "arch/arm/system.hh"
46#include "base/loader/object_file.hh"
47#include "base/loader/symtab.hh"
48#include "cpu/thread_context.hh"
49#include "mem/physical.hh"
50
51using namespace std;
52using namespace Linux;
53
54ArmSystem::ArmSystem(Params *p)
55    : System(p), bootldr(NULL)
56{
57    debugPrintkEvent = addKernelFuncEvent<DebugPrintkEvent>("dprintk");
58
59    if ((p->boot_loader == "") != (p->boot_loader_mem == NULL))
60        fatal("If boot_loader is specifed, memory to load it must be also.\n");
61
62    if (p->boot_loader != "") {
63        bootldr = createObjectFile(p->boot_loader);
64
65        if (!bootldr)
66            fatal("Could not read bootloader: %s\n", p->boot_loader);
67
68        Port *mem_port;
69        FunctionalPort fp(name() + "-fport");
70        mem_port = p->boot_loader_mem->getPort("functional");
71        fp.setPeer(mem_port);
72        mem_port->setPeer(&fp);
73
74        bootldr->loadSections(&fp);
75        bootldr->loadGlobalSymbols(debugSymbolTable);
76
77        uint8_t jump_to_bl[] =
78        {
79            0x07, 0xf0, 0xa0, 0xe1  // branch to r7
80        };
81        functionalPort->writeBlob(0x0, jump_to_bl, sizeof(jump_to_bl));
82
83        inform("Using bootloader at address %#x\n", bootldr->entryPoint());
84    }
85}
86
87void
88ArmSystem::initState()
89{
90    System::initState();
91    if (bootldr) {
92        // Put the address of the boot loader into r7 so we know
93        // where to branch to after the reset fault
94        // All other values needed by the boot loader to know what to do
95        for (int i = 0; i < threadContexts.size(); i++) {
96            threadContexts[i]->setIntReg(3, kernelEntry & loadAddrMask);
97            threadContexts[i]->setIntReg(4, params()->gic_cpu_addr);
98            threadContexts[i]->setIntReg(5, params()->flags_addr);
99            threadContexts[i]->setIntReg(7, bootldr->entryPoint());
100        }
101        if (!params()->gic_cpu_addr || !params()->flags_addr)
102            fatal("gic_cpu_addr && flags_addr must be set with bootloader\n");
103    } else {
104        // Set the initial PC to be at start of the kernel code
105        threadContexts[0]->pcState(kernelEntry & loadAddrMask);
106    }
107    for (int i = 0; i < threadContexts.size(); i++) {
108        if (params()->midr_regval) {
109            threadContexts[i]->setMiscReg(ArmISA::MISCREG_MIDR,
110                    params()->midr_regval);
111        }
112    }
113
114}
115
116ArmSystem::~ArmSystem()
117{
118    if (debugPrintkEvent)
119        delete debugPrintkEvent;
120}
121
122
123ArmSystem *
124ArmSystemParams::create()
125{
126    return new ArmSystem(this);
127}
128