e2dbe59f5d
In order for a system object to work in SE mode and FS mode, it has to either always require a platform object even in SE mode, or get rid of the requirement all together. Making SE mode carry around unnecessary/unused bits of FS seems less than ideal, so I decided to go with the second option. The platform pointer in the System class was used for exactly one purpose, a path for the Alpha Linux system object to get to the real time clock and read its frequency so that it could short cut the loops_per_jiffy calculation. There was also a copy and pasted implementation in MIPS, but since it was only there because it was there in Alpha I still count that as one use. This change reverses the mechanism that communicates the RTC frequency so that the Tsunami platform object pushes it up to the AlphaSystem object. This is slightly less specific than it could be because really only the AlphaLinuxSystem uses it. Because the intrFrequency function on the Platform class was no longer necessary (and unimplemented on anything but Alpha) it was eliminated. After this change, a platform will need to have a system, but a system won't have to have a platform.
182 lines
6.2 KiB
C++
182 lines
6.2 KiB
C++
/*
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* Copyright (c) 2004-2006 The Regents of The University of Michigan
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer;
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* redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution;
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* neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Authors: Ali Saidi
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* Lisa Hsu
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* Nathan Binkert
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*/
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/**
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* @file
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* This code loads the linux kernel, console, pal and patches certain
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* functions. The symbol tables are loaded so that traces can show
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* the executing function and we can skip functions. Various delay
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* loops are skipped and their final values manually computed to speed
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* up boot time.
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*/
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#include "arch/mips/linux/system.hh"
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#include "arch/mips/linux/threadinfo.hh"
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#include "arch/mips/idle_event.hh"
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#include "arch/mips/system.hh"
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#include "arch/vtophys.hh"
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#include "base/loader/symtab.hh"
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#include "cpu/base.hh"
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#include "cpu/thread_context.hh"
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#include "dev/platform.hh"
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#include "kern/linux/events.hh"
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#include "kern/linux/printk.hh"
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#include "mem/physical.hh"
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#include "mem/port.hh"
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#include "sim/arguments.hh"
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#include "sim/byteswap.hh"
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using namespace std;
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using namespace MipsISA;
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using namespace Linux;
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LinuxMipsSystem::LinuxMipsSystem(Params *p)
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: MipsSystem(p)
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{
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Addr addr = 0;
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/**
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* The symbol swapper_pg_dir marks the beginning of the kernel and
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* the location of bootloader passed arguments
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*/
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if (!kernelSymtab->findAddress("swapper_pg_dir", KernelStart)) {
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panic("Could not determine start location of kernel");
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}
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/**
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* Since we aren't using a bootloader, we have to copy the
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* kernel arguments directly into the kernel's memory.
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*/
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virtPort.writeBlob(CommandLine(), (uint8_t*)params()->boot_osflags.c_str(),
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params()->boot_osflags.length()+1);
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/**
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* find the address of the est_cycle_freq variable and insert it
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* so we don't through the lengthly process of trying to
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* calculated it by using the PIT, RTC, etc.
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*/
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if (kernelSymtab->findAddress("est_cycle_freq", addr))
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virtPort.write(addr, (uint64_t)(SimClock::Frequency /
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p->boot_cpu_frequency));
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/**
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* EV5 only supports 127 ASNs so we are going to tell the kernel that the
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* paritiuclar EV6 we have only supports 127 asns.
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* @todo At some point we should change ev5.hh and the palcode to support
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* 255 ASNs.
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*/
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if (kernelSymtab->findAddress("dp264_mv", addr))
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virtPort.write(addr + 0x18, LittleEndianGuest::htog((uint32_t)127));
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else
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panic("could not find dp264_mv\n");
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#ifndef NDEBUG
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kernelPanicEvent = addKernelFuncEvent<BreakPCEvent>("panic");
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if (!kernelPanicEvent)
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panic("could not find kernel symbol \'panic\'");
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#endif
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/**
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* Any time ide_delay_50ms, calibarte_delay or
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* determine_cpu_caches is called just skip the
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* function. Currently determine_cpu_caches only is used put
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* information in proc, however if that changes in the future we
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* will have to fill in the cache size variables appropriately.
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*/
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skipIdeDelay50msEvent =
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addKernelFuncEvent<SkipFuncEvent>("ide_delay_50ms");
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skipDelayLoopEvent =
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addKernelFuncEvent<SkipDelayLoopEvent>("calibrate_delay");
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skipCacheProbeEvent =
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addKernelFuncEvent<SkipFuncEvent>("determine_cpu_caches");
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debugPrintkEvent = addKernelFuncEvent<DebugPrintkEvent>("dprintk");
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idleStartEvent = addKernelFuncEvent<IdleStartEvent>("cpu_idle");
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// Disable for now as it runs into panic() calls in VPTr methods
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// (see sim/vptr.hh). Once those bugs are fixed, we can
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// re-enable, but we should find a better way to turn it on than
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// using DTRACE(Thread), since looking at a trace flag at tick 0
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// leads to non-intuitive behavior with --trace-start.
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if (false && kernelSymtab->findAddress("mips_switch_to", addr)) {
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printThreadEvent = new PrintThreadInfo(&pcEventQueue, "threadinfo",
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addr + sizeof(MachInst) * 6);
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} else {
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printThreadEvent = NULL;
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}
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}
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LinuxMipsSystem::~LinuxMipsSystem()
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{
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#ifndef NDEBUG
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delete kernelPanicEvent;
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#endif
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delete skipIdeDelay50msEvent;
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delete skipDelayLoopEvent;
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delete skipCacheProbeEvent;
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delete debugPrintkEvent;
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delete idleStartEvent;
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delete printThreadEvent;
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}
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void
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LinuxMipsSystem::setDelayLoop(ThreadContext *tc)
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{
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panic("setDelayLoop not implemented.\n");
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}
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void
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LinuxMipsSystem::SkipDelayLoopEvent::process(ThreadContext *tc)
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{
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SkipFuncEvent::process(tc);
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// calculate and set loops_per_jiffy
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((LinuxMipsSystem *)tc->getSystemPtr())->setDelayLoop(tc);
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}
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void
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LinuxMipsSystem::PrintThreadInfo::process(ThreadContext *tc)
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{
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Linux::ThreadInfo ti(tc);
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DPRINTF(Thread, "Currently Executing Thread %s, pid %d, started at: %d\n",
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ti.curTaskName(), ti.curTaskPID(), ti.curTaskStart());
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}
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LinuxMipsSystem *
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LinuxMipsSystemParams::create()
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{
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return new LinuxMipsSystem(this);
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}
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