system.cc revision 13173:210b6fc57533 
1/*
2 * Copyright (c) 2010, 2012-2013, 2015,2017-2018 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/system.hh"
44
45#include <iostream>
46
47#include "arch/arm/semihosting.hh"
48#include "base/loader/object_file.hh"
49#include "base/loader/symtab.hh"
50#include "cpu/thread_context.hh"
51#include "mem/fs_translating_port_proxy.hh"
52#include "mem/physical.hh"
53#include "sim/full_system.hh"
54
55using namespace std;
56using namespace Linux;
57
58ArmSystem::ArmSystem(Params *p)
59    : System(p),
60      bootLoaders(), bootldr(nullptr),
61      _haveSecurity(p->have_security),
62      _haveLPAE(p->have_lpae),
63      _haveVirtualization(p->have_virtualization),
64      _haveCrypto(p->have_crypto),
65      _genericTimer(nullptr),
66      _highestELIs64(p->highest_el_is_64),
67      _resetAddr64(p->auto_reset_addr_64 ?
68                   (kernelEntry & loadAddrMask) + loadAddrOffset :
69                   p->reset_addr_64),
70      _physAddrRange64(p->phys_addr_range_64),
71      _haveLargeAsid64(p->have_large_asid_64),
72      _m5opRange(p->m5ops_base ?
73                 RangeSize(p->m5ops_base, 0x10000) :
74                 AddrRange(1, 0)), // Create an empty range if disabled
75      semihosting(p->semihosting),
76      multiProc(p->multi_proc)
77{
78    // Check if the physical address range is valid
79    if (_highestELIs64 && (
80            _physAddrRange64 < 32 ||
81            _physAddrRange64 > 48 ||
82            (_physAddrRange64 % 4 != 0 && _physAddrRange64 != 42))) {
83        fatal("Invalid physical address range (%d)\n", _physAddrRange64);
84    }
85
86    bootLoaders.reserve(p->boot_loader.size());
87    for (const auto &bl : p->boot_loader) {
88        std::unique_ptr<ObjectFile> obj;
89        obj.reset(createObjectFile(bl));
90
91        fatal_if(!obj, "Could not read bootloader: %s\n", bl);
92        bootLoaders.emplace_back(std::move(obj));
93    }
94
95    if (kernel) {
96        bootldr = getBootLoader(kernel);
97    } else if (!bootLoaders.empty()) {
98        // No kernel specified, default to the first boot loader
99        bootldr = bootLoaders[0].get();
100    }
101
102    if (!bootLoaders.empty() && !bootldr)
103        fatal("Can't find a matching boot loader / kernel combination!");
104
105    if (bootldr) {
106        bootldr->loadGlobalSymbols(debugSymbolTable);
107        if ((bootldr->getArch() == ObjectFile::Arm64) && !_highestELIs64) {
108            warn("Highest ARM exception-level set to AArch32 but bootloader "
109                  "is for AArch64. Assuming you wanted these to match.\n");
110            _highestELIs64 = true;
111        } else if ((bootldr->getArch() == ObjectFile::Arm) && _highestELIs64) {
112            warn("Highest ARM exception-level set to AArch64 but bootloader "
113                  "is for AArch32. Assuming you wanted these to match.\n");
114            _highestELIs64 = false;
115        }
116    }
117
118    debugPrintkEvent = addKernelFuncEvent<DebugPrintkEvent>("dprintk");
119}
120
121void
122ArmSystem::initState()
123{
124    // Moved from the constructor to here since it relies on the
125    // address map being resolved in the interconnect
126
127    // Call the initialisation of the super class
128    System::initState();
129
130    const Params* p = params();
131
132    if (bootldr) {
133        bootldr->loadSections(physProxy);
134
135        uint8_t jump_to_bl_32[] =
136        {
137            0x07, 0xf0, 0xa0, 0xe1  // branch to r7 in aarch32
138        };
139
140        uint8_t jump_to_bl_64[] =
141        {
142            0xe0, 0x00, 0x1f, 0xd6  // instruction "br x7" in aarch64
143        };
144
145        // write the jump to branch table into address 0
146        if (!_highestELIs64)
147            physProxy.writeBlob(0x0, jump_to_bl_32, sizeof(jump_to_bl_32));
148        else
149            physProxy.writeBlob(0x0, jump_to_bl_64, sizeof(jump_to_bl_64));
150
151        inform("Using bootloader at address %#x\n", bootldr->entryPoint());
152
153        // Put the address of the boot loader into r7 so we know
154        // where to branch to after the reset fault
155        // All other values needed by the boot loader to know what to do
156        if (!p->gic_cpu_addr || !p->flags_addr)
157            fatal("gic_cpu_addr && flags_addr must be set with bootloader\n");
158
159        for (int i = 0; i < threadContexts.size(); i++) {
160            if (!_highestELIs64)
161                threadContexts[i]->setIntReg(3, (kernelEntry & loadAddrMask) +
162                        loadAddrOffset);
163            threadContexts[i]->setIntReg(4, params()->gic_cpu_addr);
164            threadContexts[i]->setIntReg(5, params()->flags_addr);
165            threadContexts[i]->setIntReg(7, bootldr->entryPoint());
166        }
167        inform("Using kernel entry physical address at %#x\n",
168               (kernelEntry & loadAddrMask) + loadAddrOffset);
169    } else {
170        // Set the initial PC to be at start of the kernel code
171        if (!_highestELIs64)
172            threadContexts[0]->pcState((kernelEntry & loadAddrMask) +
173                    loadAddrOffset);
174    }
175}
176
177ArmSystem*
178ArmSystem::getArmSystem(ThreadContext *tc)
179{
180    ArmSystem *a_sys = dynamic_cast<ArmSystem *>(tc->getSystemPtr());
181    assert(a_sys);
182    return a_sys;
183}
184
185bool
186ArmSystem::haveSecurity(ThreadContext *tc)
187{
188    return FullSystem? getArmSystem(tc)->haveSecurity() : false;
189}
190
191
192ArmSystem::~ArmSystem()
193{
194    if (debugPrintkEvent)
195        delete debugPrintkEvent;
196}
197
198ObjectFile *
199ArmSystem::getBootLoader(ObjectFile *const obj)
200{
201    for (auto &bl : bootLoaders) {
202        if (bl->getArch() == obj->getArch())
203            return bl.get();
204    }
205
206    return nullptr;
207}
208
209bool
210ArmSystem::haveLPAE(ThreadContext *tc)
211{
212    return FullSystem? getArmSystem(tc)->haveLPAE() : false;
213}
214
215bool
216ArmSystem::haveVirtualization(ThreadContext *tc)
217{
218    return FullSystem? getArmSystem(tc)->haveVirtualization() : false;
219}
220
221bool
222ArmSystem::highestELIs64(ThreadContext *tc)
223{
224    return FullSystem? getArmSystem(tc)->highestELIs64() : true;
225}
226
227ExceptionLevel
228ArmSystem::highestEL(ThreadContext *tc)
229{
230    return FullSystem? getArmSystem(tc)->highestEL() : EL1;
231}
232
233bool
234ArmSystem::haveEL(ThreadContext *tc, ExceptionLevel el)
235{
236    switch (el) {
237      case EL0:
238      case EL1:
239        return true;
240      case EL2:
241        return haveVirtualization(tc);
242      case EL3:
243        return haveSecurity(tc);
244      default:
245        warn("Unimplemented Exception Level\n");
246        return false;
247    }
248}
249
250Addr
251ArmSystem::resetAddr64(ThreadContext *tc)
252{
253    return getArmSystem(tc)->resetAddr64();
254}
255
256uint8_t
257ArmSystem::physAddrRange(ThreadContext *tc)
258{
259    return getArmSystem(tc)->physAddrRange();
260}
261
262Addr
263ArmSystem::physAddrMask(ThreadContext *tc)
264{
265    return getArmSystem(tc)->physAddrMask();
266}
267
268bool
269ArmSystem::haveLargeAsid64(ThreadContext *tc)
270{
271    return getArmSystem(tc)->haveLargeAsid64();
272}
273
274bool
275ArmSystem::haveSemihosting(ThreadContext *tc)
276{
277    return FullSystem && getArmSystem(tc)->haveSemihosting();
278}
279
280uint64_t
281ArmSystem::callSemihosting64(ThreadContext *tc,
282                             uint32_t op, uint64_t param)
283{
284    ArmSystem *sys = getArmSystem(tc);
285    return sys->semihosting->call64(tc, op, param);
286}
287
288uint32_t
289ArmSystem::callSemihosting32(ThreadContext *tc,
290                             uint32_t op, uint32_t param)
291{
292    ArmSystem *sys = getArmSystem(tc);
293    return sys->semihosting->call32(tc, op, param);
294}
295
296ArmSystem *
297ArmSystemParams::create()
298{
299    return new ArmSystem(this);
300}
301
302void
303GenericArmSystem::initState()
304{
305    // Moved from the constructor to here since it relies on the
306    // address map being resolved in the interconnect
307
308    // Call the initialisation of the super class
309    ArmSystem::initState();
310}
311
312GenericArmSystem *
313GenericArmSystemParams::create()
314{
315
316    return new GenericArmSystem(this);
317}
318