gem5/kern/linux/linux_system.cc

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/*
* Copyright (c) 2004 The Regents of The University of Michigan
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* @file
* linux_system.cc loads the linux kernel, console, pal and patches certain functions.
* The symbol tables are loaded so that traces can show the executing function and we can
* skip functions. Various delay loops are skipped and their final values manually computed to
* speed up boot time.
*/
#include "base/loader/aout_object.hh"
#include "base/loader/elf_object.hh"
#include "base/loader/object_file.hh"
#include "base/loader/symtab.hh"
#include "base/remote_gdb.hh"
#include "base/trace.hh"
#include "cpu/exec_context.hh"
#include "cpu/base_cpu.hh"
#include "kern/linux/linux_events.hh"
#include "kern/linux/linux_system.hh"
#include "kern/system_events.hh"
#include "mem/functional_mem/memory_control.hh"
#include "mem/functional_mem/physical_memory.hh"
#include "sim/builder.hh"
#include "dev/platform.hh"
#include "targetarch/isa_traits.hh"
#include "targetarch/vtophys.hh"
extern SymbolTable *debugSymbolTable;
using namespace std;
LinuxSystem::LinuxSystem(const string _name, const uint64_t _init_param,
MemoryController *_memCtrl, PhysicalMemory *_physmem,
const string &kernel_path, const string &console_path,
const string &palcode, const string &boot_osflags,
const bool _bin, const vector<string> &_binned_fns)
: System(_name, _init_param, _memCtrl, _physmem, _bin, _binned_fns),
bin(_bin), binned_fns(_binned_fns)
{
kernelSymtab = new SymbolTable;
consoleSymtab = new SymbolTable;
/**
* Load the kernel, pal, and console code into memory
*/
// Load kernel code
ObjectFile *kernel = createObjectFile(kernel_path);
if (kernel == NULL)
fatal("Could not load kernel file %s", kernel_path);
// Load Console Code
ObjectFile *console = createObjectFile(console_path);
if (console == NULL)
fatal("Could not load console file %s", console_path);
// Load pal file
ObjectFile *pal = createObjectFile(palcode);
if (pal == NULL)
fatal("Could not load PALcode file %s", palcode);
pal->loadSections(physmem, true);
// Load console file
console->loadSections(physmem, true);
// Load kernel file
kernel->loadSections(physmem, true);
kernelStart = kernel->textBase();
kernelEnd = kernel->bssBase() + kernel->bssSize();
kernelEntry = kernel->entryPoint();
// load symbols
if (!kernel->loadGlobalSymbols(kernelSymtab))
panic("could not load kernel symbols\n");
debugSymbolTable = kernelSymtab;
if (!kernel->loadLocalSymbols(kernelSymtab))
panic("could not load kernel local symbols\n");
if (!console->loadGlobalSymbols(consoleSymtab))
panic("could not load console symbols\n");
DPRINTF(Loader, "Kernel start = %#x\n"
"Kernel end = %#x\n"
"Kernel entry = %#x\n",
kernelStart, kernelEnd, kernelEntry);
DPRINTF(Loader, "Kernel loaded...\n");
#ifdef DEBUG
kernelPanicEvent = new BreakPCEvent(&pcEventQueue, "kernel panic");
consolePanicEvent = new BreakPCEvent(&pcEventQueue, "console panic");
#endif
skipIdeDelay50msEvent = new SkipFuncEvent(&pcEventQueue,
"ide_delay_50ms");
skipDelayLoopEvent = new LinuxSkipDelayLoopEvent(&pcEventQueue,
"calibrate_delay");
skipCacheProbeEvent = new SkipFuncEvent(&pcEventQueue,
"determine_cpu_caches");
Addr addr = 0;
/**
* find the address of the est_cycle_freq variable and insert it so we don't
* through the lengthly process of trying to calculated it by using the PIT,
* RTC, etc.
*/
if (kernelSymtab->findAddress("est_cycle_freq", addr)) {
Addr paddr = vtophys(physmem, addr);
uint8_t *est_cycle_frequency =
physmem->dma_addr(paddr, sizeof(uint64_t));
if (est_cycle_frequency)
*(uint64_t *)est_cycle_frequency = htoa(ticksPerSecond);
}
/**
* Copy the osflags (kernel arguments) into the consoles memory. Presently
* Linux does use the console service routine to get these command line
* arguments, but we might as well make them available just in case.
*/
if (consoleSymtab->findAddress("env_booted_osflags", addr)) {
Addr paddr = vtophys(physmem, addr);
char *osflags = (char *)physmem->dma_addr(paddr, sizeof(uint32_t));
if (osflags)
strcpy(osflags, boot_osflags.c_str());
}
/**
* Since we aren't using a bootloader, we have to copy the kernel arguments
* directly into the kernels memory.
*/
{
Addr paddr = vtophys(physmem, PARAM_ADDR);
char *commandline = (char*)physmem->dma_addr(paddr, sizeof(uint64_t));
if (commandline)
strcpy(commandline, boot_osflags.c_str());
}
/**
* Set the hardware reset parameter block system type and revision information
* to Tsunami.
*/
if (consoleSymtab->findAddress("xxm_rpb", addr)) {
Addr paddr = vtophys(physmem, addr);
char *hwprb = (char *)physmem->dma_addr(paddr, sizeof(uint64_t));
if (hwprb) {
*(uint64_t*)(hwprb+0x50) = htoa(ULL(34)); // Tsunami
*(uint64_t*)(hwprb+0x58) = htoa(ULL(1)<<10); // Plain DP264
}
else
panic("could not translate hwprb addr to set system type/variation\n");
} else
panic("could not find hwprb to set system type/variation\n");
#ifdef DEBUG
if (kernelSymtab->findAddress("panic", addr))
kernelPanicEvent->schedule(addr);
else
panic("could not find kernel symbol \'panic\'");
if (consoleSymtab->findAddress("panic", addr))
consolePanicEvent->schedule(addr);
#endif
/**
* Any time ide_delay_50ms, calibarte_delay or determine_cpu_caches is called
* just skip the function. Currently determine_cpu_caches only is used put
* information in proc, however if that changes in the future we will have to
* fill in the cache size variables appropriately.
*/
if (kernelSymtab->findAddress("ide_delay_50ms", addr))
skipIdeDelay50msEvent->schedule(addr+sizeof(MachInst));
if (kernelSymtab->findAddress("calibrate_delay", addr))
skipDelayLoopEvent->schedule(addr+sizeof(MachInst));
if (kernelSymtab->findAddress("determine_cpu_caches", addr))
skipCacheProbeEvent->schedule(addr+sizeof(MachInst));
}
LinuxSystem::~LinuxSystem()
{
delete kernel;
delete console;
delete kernelSymtab;
delete consoleSymtab;
delete kernelPanicEvent;
delete consolePanicEvent;
delete skipIdeDelay50msEvent;
delete skipDelayLoopEvent;
delete skipCacheProbeEvent;
}
void
LinuxSystem::setDelayLoop(ExecContext *xc)
{
Addr addr = 0;
if (kernelSymtab->findAddress("loops_per_jiffy", addr)) {
Addr paddr = vtophys(physmem, addr);
uint8_t *loops_per_jiffy =
physmem->dma_addr(paddr, sizeof(uint32_t));
Tick cpuFreq = xc->cpu->getFreq();
Tick intrFreq = platform->interrupt_frequency;
*(uint32_t *)loops_per_jiffy =
(uint32_t)((cpuFreq / intrFreq) * 0.9988);
}
}
int
LinuxSystem::registerExecContext(ExecContext *xc)
{
int xcIndex = System::registerExecContext(xc);
if (xcIndex == 0) {
// activate with zero delay so that we start ticking right
// away on cycle 0
xc->activate(0);
}
RemoteGDB *rgdb = new RemoteGDB(this, xc);
GDBListener *gdbl = new GDBListener(rgdb, 7000 + xcIndex);
gdbl->listen();
/**
* Uncommenting this line waits for a remote debugger to connect
* to the simulator before continuing.
*/
//gdbl->accept();
if (remoteGDB.size() <= xcIndex) {
remoteGDB.resize(xcIndex+1);
}
remoteGDB[xcIndex] = rgdb;
return xcIndex;
}
void
LinuxSystem::replaceExecContext(ExecContext *xc, int xcIndex)
{
System::replaceExecContext(xcIndex, xc);
remoteGDB[xcIndex]->replaceExecContext(xc);
}
bool
LinuxSystem::breakpoint()
{
return remoteGDB[0]->trap(ALPHA_KENTRY_IF);
}
BEGIN_DECLARE_SIM_OBJECT_PARAMS(LinuxSystem)
Param<bool> bin;
SimObjectParam<MemoryController *> mem_ctl;
SimObjectParam<PhysicalMemory *> physmem;
Param<uint64_t> init_param;
Param<string> kernel_code;
Param<string> console_code;
Param<string> pal_code;
Param<string> boot_osflags;
VectorParam<string> binned_fns;
END_DECLARE_SIM_OBJECT_PARAMS(LinuxSystem)
BEGIN_INIT_SIM_OBJECT_PARAMS(LinuxSystem)
INIT_PARAM_DFLT(bin, "is this system to be binned", false),
INIT_PARAM(mem_ctl, "memory controller"),
INIT_PARAM(physmem, "phsyical memory"),
INIT_PARAM_DFLT(init_param, "numerical value to pass into simulator", 0),
INIT_PARAM(kernel_code, "file that contains the code"),
INIT_PARAM(console_code, "file that contains the console code"),
INIT_PARAM(pal_code, "file that contains palcode"),
INIT_PARAM_DFLT(boot_osflags, "flags to pass to the kernel during boot",
"a"),
INIT_PARAM(binned_fns, "functions to be broken down and binned")
END_INIT_SIM_OBJECT_PARAMS(LinuxSystem)
CREATE_SIM_OBJECT(LinuxSystem)
{
LinuxSystem *sys = new LinuxSystem(getInstanceName(), init_param, mem_ctl,
physmem, kernel_code, console_code,
pal_code, boot_osflags, bin, binned_fns);
return sys;
}
REGISTER_SIM_OBJECT("LinuxSystem", LinuxSystem)