src/arch/arm/freebsd/system.cc

   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_file.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
  50 using namespace ArmISA;
  51 using namespace FreeBSD;
  52
  53 FreebsdArmSystem::FreebsdArmSystem(Params *p)
  54     : GenericArmSystem(p),
  55       enableContextSwitchStatsDump(p->enable_context_switch_stats_dump),
  56       taskFile(nullptr), kernelPanicEvent(nullptr), kernelOopsEvent(nullptr)
  57 {
  58     if (p->panic_on_panic) {
  59         kernelPanicEvent = addKernelFuncEventOrPanic<PanicPCEvent>(
  60             "panic", "Kernel panic in simulated kernel");
  61     } else {
  62 #ifndef NDEBUG
  63         kernelPanicEvent = addKernelFuncEventOrPanic<BreakPCEvent>("panic");
  64 #endif
  65     }
  66
  67     if (p->panic_on_oops) {
  68         kernelOopsEvent = addKernelFuncEventOrPanic<PanicPCEvent>(
  69             "oops_exit", "Kernel oops in guest");
  70     }
  71
  72     uDelaySkipEvent = addKernelFuncEvent<UDelayEvent>(
  73         "DELAY", "DELAY", 1000, 0);
  74 }
  75
  76 void
  77 FreebsdArmSystem::initState()
  78 {
  79     // Moved from the constructor to here since it relies on the
  80     // address map being resolved in the interconnect
  81
  82     // Call the initialisation of the super class
  83     GenericArmSystem::initState();
  84
  85     // Load symbols at physical address, we might not want
  86     // to do this permanently, for but early bootup work
  87     // it is helpful.
  88     if (params()->early_kernel_symbols) {
  89         kernel->loadGlobalSymbols(kernelSymtab, 0, 0, loadAddrMask);
  90         kernel->loadGlobalSymbols(debugSymbolTable, 0, 0, loadAddrMask);
  91     }
  92
  93     // Setup boot data structure
  94     Addr addr = 0;
  95
  96     // Check if the kernel image has a symbol that tells us it supports
  97     // device trees.
  98     bool kernel_has_fdt_support =
  99         kernelSymtab->findAddress("fdt_get_range", addr);
 100     bool dtb_file_specified = params()->dtb_filename != "";
 101
 102     if (!dtb_file_specified)
 103         fatal("dtb file is not specified\n");
 104
 105     if (!kernel_has_fdt_support)
 106         fatal("kernel must have fdt support\n");
 107
 108     // Kernel supports flattened device tree and dtb file specified.
 109     // Using Device Tree Blob to describe system configuration.
 110     inform("Loading DTB file: %s at address %#x\n", params()->dtb_filename,
 111             params()->atags_addr + loadAddrOffset);
 112
 113     DtbFile *dtb_file = new DtbFile(params()->dtb_filename);
 114
 115     if (!dtb_file->addBootCmdLine(params()->boot_osflags.c_str(),
 116                                   params()->boot_osflags.size())) {
 117         warn("couldn't append bootargs to DTB file: %s\n",
 118              params()->dtb_filename);
 119     }
 120
 121     Addr ra = dtb_file->findReleaseAddr();
 122     if (ra)
 123         bootReleaseAddr = ra & ~ULL(0x7F);
 124
 125     dtb_file->buildImage().
 126         offset(params()->atags_addr + loadAddrOffset).write(physProxy);
 127     delete dtb_file;
 128
 129     // Kernel boot requirements to set up r0, r1 and r2 in ARMv7
 130     for (int i = 0; i < threadContexts.size(); i++) {
 131         threadContexts[i]->setIntReg(0, 0);
 132         threadContexts[i]->setIntReg(1, params()->machine_type);
 133         threadContexts[i]->setIntReg(2, params()->atags_addr + loadAddrOffset);
 134     }
 135 }
 136
 137 FreebsdArmSystem::~FreebsdArmSystem()
 138 {
 139     if (uDelaySkipEvent)
 140         delete uDelaySkipEvent;
 141     if (constUDelaySkipEvent)
 142         delete constUDelaySkipEvent;
 143 }
 144
 145 FreebsdArmSystem *
 146 FreebsdArmSystemParams::create()
 147 {
 148     return new FreebsdArmSystem(this);
 149 }
 150
 151 void
 152 FreebsdArmSystem::startup()
 153 {
 154 }