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/*
* Copyright (c) 2004-2006 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.
*
* Authors: Ali Saidi
* Lisa Hsu
* Nathan Binkert
*/
/**
* @file
* This code 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 "arch/vtophys.hh"
#include "arch/mips/idle_event.hh"
#include "arch/mips/linux/system.hh"
#include "arch/mips/linux/threadinfo.hh"
#include "arch/mips/system.hh"
#include "base/loader/symtab.hh"
#include "cpu/thread_context.hh"
#include "cpu/base.hh"
#include "dev/platform.hh"
#include "kern/linux/printk.hh"
#include "kern/linux/events.hh"
#include "mem/physical.hh"
#include "mem/port.hh"
#include "sim/arguments.hh"
#include "sim/byteswap.hh"
using namespace std;
using namespace MipsISA;
using namespace Linux;
LinuxMipsSystem::LinuxMipsSystem(Params *p)
: MipsSystem(p)
{
Addr addr = 0;
/**
* The symbol swapper_pg_dir marks the beginning of the kernel and
* the location of bootloader passed arguments
*/
if (!kernelSymtab->findAddress("swapper_pg_dir", KernelStart)) {
panic("Could not determine start location of kernel");
}
/**
* Since we aren't using a bootloader, we have to copy the
* kernel arguments directly into the kernel's memory.
*/
virtPort.writeBlob(CommandLine(), (uint8_t*)params()->boot_osflags.c_str(),
params()->boot_osflags.length()+1);
/**
* 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))
virtPort.write(addr, (uint64_t)(SimClock::Frequency /
p->boot_cpu_frequency));
/**
* EV5 only supports 127 ASNs so we are going to tell the kernel that the
* paritiuclar EV6 we have only supports 127 asns.
* @todo At some point we should change ev5.hh and the palcode to support
* 255 ASNs.
*/
if (kernelSymtab->findAddress("dp264_mv", addr))
virtPort.write(addr + 0x18, LittleEndianGuest::htog((uint32_t)127));
else
panic("could not find dp264_mv\n");
#ifndef NDEBUG
kernelPanicEvent = addKernelFuncEvent<BreakPCEvent>("panic");
if (!kernelPanicEvent)
panic("could not find kernel symbol \'panic\'");
#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.
*/
skipIdeDelay50msEvent =
addKernelFuncEvent<SkipFuncEvent>("ide_delay_50ms");
skipDelayLoopEvent =
addKernelFuncEvent<SkipDelayLoopEvent>("calibrate_delay");
skipCacheProbeEvent =
addKernelFuncEvent<SkipFuncEvent>("determine_cpu_caches");
debugPrintkEvent = addKernelFuncEvent<DebugPrintkEvent>("dprintk");
idleStartEvent = addKernelFuncEvent<IdleStartEvent>("cpu_idle");
// Disable for now as it runs into panic() calls in VPTr methods
// (see sim/vptr.hh). Once those bugs are fixed, we can
// re-enable, but we should find a better way to turn it on than
// using DTRACE(Thread), since looking at a trace flag at tick 0
// leads to non-intuitive behavior with --trace-start.
if (false && kernelSymtab->findAddress("mips_switch_to", addr)) {
printThreadEvent = new PrintThreadInfo(&pcEventQueue, "threadinfo",
addr + sizeof(MachInst) * 6);
} else {
printThreadEvent = NULL;
}
}
LinuxMipsSystem::~LinuxMipsSystem()
{
#ifndef NDEBUG
delete kernelPanicEvent;
#endif
delete skipIdeDelay50msEvent;
delete skipDelayLoopEvent;
delete skipCacheProbeEvent;
delete debugPrintkEvent;
delete idleStartEvent;
delete printThreadEvent;
}
void
LinuxMipsSystem::setDelayLoop(ThreadContext *tc)
{
Addr addr = 0;
if (kernelSymtab->findAddress("loops_per_jiffy", addr)) {
Tick cpuFreq = tc->getCpuPtr()->frequency();
Tick intrFreq = platform->intrFrequency();
VirtualPort *vp;
vp = tc->getVirtPort();
vp->writeHtoG(addr, (uint32_t)((cpuFreq / intrFreq) * 0.9988));
}
}
void
LinuxMipsSystem::SkipDelayLoopEvent::process(ThreadContext *tc)
{
SkipFuncEvent::process(tc);
// calculate and set loops_per_jiffy
((LinuxMipsSystem *)tc->getSystemPtr())->setDelayLoop(tc);
}
void
LinuxMipsSystem::PrintThreadInfo::process(ThreadContext *tc)
{
Linux::ThreadInfo ti(tc);
DPRINTF(Thread, "Currently Executing Thread %s, pid %d, started at: %d\n",
ti.curTaskName(), ti.curTaskPID(), ti.curTaskStart());
}
LinuxMipsSystem *
LinuxMipsSystemParams::create()
{
return new LinuxMipsSystem(this);
}
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