system.cc revision 10810:683ab55819fd 
1/*
2 * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
3 * All rights reserved.
4 *
5 * This software was developed by the University of Cambridge Computer
6 * Laboratory as part of the CTSRD Project, with support from the UK Higher
7 * Education Innovation Fund (HEIF).
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are
11 * met: redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer;
13 * redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution;
16 * neither the name of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#include "arch/arm/freebsd/system.hh"
34
35#include "arch/arm/isa_traits.hh"
36#include "arch/arm/utility.hh"
37#include "arch/generic/freebsd/threadinfo.hh"
38#include "base/loader/dtb_object.hh"
39#include "base/loader/object_file.hh"
40#include "base/loader/symtab.hh"
41#include "cpu/base.hh"
42#include "cpu/pc_event.hh"
43#include "cpu/thread_context.hh"
44#include "debug/Loader.hh"
45#include "kern/freebsd/events.hh"
46#include "mem/fs_translating_port_proxy.hh"
47#include "mem/physical.hh"
48#include "sim/stat_control.hh"
49
50using namespace ArmISA;
51using namespace FreeBSD;
52
53FreebsdArmSystem::FreebsdArmSystem(Params *p)
54    : GenericArmSystem(p), dumpStatsPCEventF(nullptr),
55      enableContextSwitchStatsDump(p->enable_context_switch_stats_dump),
56      taskFile(nullptr), kernelPanicEvent(nullptr), kernelOopsEvent(nullptr),
57      bootReleaseAddr(p->boot_release_addr)
58{
59    if (p->panic_on_panic) {
60        kernelPanicEvent = addKernelFuncEventOrPanic<PanicPCEvent>(
61            "panic", "Kernel panic in simulated kernel");
62    } else {
63#ifndef NDEBUG
64        kernelPanicEvent = addKernelFuncEventOrPanic<BreakPCEvent>("panic");
65#endif
66    }
67
68    if (p->panic_on_oops) {
69        kernelOopsEvent = addKernelFuncEventOrPanic<PanicPCEvent>(
70            "oops_exit", "Kernel oops in guest");
71    }
72
73    uDelaySkipEvent = addKernelFuncEvent<UDelayEvent>(
74        "DELAY", "DELAY", 1000, 0);
75}
76
77bool
78FreebsdArmSystem::adderBootUncacheable(Addr a)
79{
80
81    return false;
82}
83
84void
85FreebsdArmSystem::initState()
86{
87    // Moved from the constructor to here since it relies on the
88    // address map being resolved in the interconnect
89
90    // Call the initialisation of the super class
91    GenericArmSystem::initState();
92
93    // Load symbols at physical address, we might not want
94    // to do this permanently, for but early bootup work
95    // it is helpful.
96    if (params()->early_kernel_symbols) {
97        kernel->loadGlobalSymbols(kernelSymtab, loadAddrMask);
98        kernel->loadGlobalSymbols(debugSymbolTable, loadAddrMask);
99    }
100
101    // Setup boot data structure
102    Addr addr = 0;
103
104    // Check if the kernel image has a symbol that tells us it supports
105    // device trees.
106    bool kernel_has_fdt_support =
107        kernelSymtab->findAddress("fdt_get_range", addr);
108    bool dtb_file_specified = params()->dtb_filename != "";
109
110    if (!dtb_file_specified)
111        fatal("dtb file is not specified\n");
112
113    if (!kernel_has_fdt_support)
114        fatal("kernel must have fdt support\n");
115
116    // Kernel supports flattened device tree and dtb file specified.
117    // Using Device Tree Blob to describe system configuration.
118    inform("Loading DTB file: %s at address %#x\n", params()->dtb_filename,
119            params()->atags_addr + loadAddrOffset);
120
121    ObjectFile *dtb_file = createObjectFile(params()->dtb_filename, true);
122    if (!dtb_file) {
123        fatal("couldn't load DTB file: %s\n", params()->dtb_filename);
124    }
125
126    DtbObject *_dtb_file = dynamic_cast<DtbObject*>(dtb_file);
127
128    if (_dtb_file) {
129        if (!_dtb_file->addBootCmdLine(params()->boot_osflags.c_str(),
130                                       params()->boot_osflags.size())) {
131            warn("couldn't append bootargs to DTB file: %s\n",
132                 params()->dtb_filename);
133        }
134    } else {
135        warn("dtb_file cast failed; couldn't append bootargs "
136             "to DTB file: %s\n", params()->dtb_filename);
137    }
138
139    Addr ra = _dtb_file->findReleaseAddr();
140    if (ra)
141        bootReleaseAddr = ra & ~ULL(0x7F);
142
143    dtb_file->setTextBase(params()->atags_addr + loadAddrOffset);
144    dtb_file->loadSections(physProxy);
145    delete dtb_file;
146
147    // Kernel boot requirements to set up r0, r1 and r2 in ARMv7
148    for (int i = 0; i < threadContexts.size(); i++) {
149        threadContexts[i]->setIntReg(0, 0);
150        threadContexts[i]->setIntReg(1, params()->machine_type);
151        threadContexts[i]->setIntReg(2, params()->atags_addr + loadAddrOffset);
152    }
153}
154
155FreebsdArmSystem::~FreebsdArmSystem()
156{
157    if (uDelaySkipEvent)
158        delete uDelaySkipEvent;
159    if (constUDelaySkipEvent)
160        delete constUDelaySkipEvent;
161
162    if (dumpStatsPCEventF)
163        delete dumpStatsPCEventF;
164}
165
166FreebsdArmSystem *
167FreebsdArmSystemParams::create()
168{
169    return new FreebsdArmSystem(this);
170}
171
172void
173FreebsdArmSystem::startup()
174{
175}
176