gem5/kern/linux/linux_system.cc

/*
 * 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
 * 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 "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"
#include "sim/debug.hh"

using namespace std;

LinuxSystem::LinuxSystem(Params *p)
    : System(p)
{
    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);
    }


    /**
     * 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, params->boot_osflags.c_str());
    }


    /**
     * 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)) {
        Addr paddr = vtophys(physmem, addr);
        char *dp264_mv = (char *)physmem->dma_addr(paddr, sizeof(uint64_t));

        if (dp264_mv) {
            *(uint32_t*)(dp264_mv+0x18) = htoa((uint32_t)127);
        } else
            panic("could not translate dp264_mv addr\n");

    } else
        panic("could not find dp264_mv\n");

#ifdef DEBUG
    kernelPanicEvent = new BreakPCEvent(&pcEventQueue, "kernel panic");
    if (kernelSymtab->findAddress("panic", addr))
        kernelPanicEvent->schedule(addr);
    else
        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 = new SkipFuncEvent(&pcEventQueue, "ide_delay_50ms");
    if (kernelSymtab->findAddress("ide_delay_50ms", addr))
        skipIdeDelay50msEvent->schedule(addr+sizeof(MachInst));

    skipDelayLoopEvent = new LinuxSkipDelayLoopEvent(&pcEventQueue,
                                                     "calibrate_delay");
    if (kernelSymtab->findAddress("calibrate_delay", addr))
        skipDelayLoopEvent->schedule(addr+sizeof(MachInst));

    skipCacheProbeEvent = new SkipFuncEvent(&pcEventQueue,
                                            "determine_cpu_caches");
    if (kernelSymtab->findAddress("determine_cpu_caches", addr))
        skipCacheProbeEvent->schedule(addr+sizeof(MachInst));

    debugPrintkEvent = new DebugPrintkEvent(&pcEventQueue, "dprintk");
    if (kernelSymtab->findAddress("dprintk", addr))
        debugPrintkEvent->schedule(addr+8);

    idleStartEvent = new IdleStartEvent(&pcEventQueue, "cpu_idle", this);
    if (kernelSymtab->findAddress("cpu_idle", addr))
        idleStartEvent->schedule(addr);

    printThreadEvent = new PrintThreadInfo(&pcEventQueue, "threadinfo");
    if (kernelSymtab->findAddress("alpha_switch_to", addr) && DTRACE(Thread))
        printThreadEvent->schedule(addr + sizeof(MachInst) * 6);

    intStartEvent = new InterruptStartEvent(&pcEventQueue, "intStartEvent");

    if (params->bin_int) {
        if (palSymtab->findAddress("sys_int_21", addr))
            intStartEvent->schedule(addr + sizeof(MachInst) * 2);
        else
            panic("could not find symbol: sys_int_21\n");

        intEndEvent = new InterruptEndEvent(&pcEventQueue, "intEndEvent");
        if (palSymtab->findAddress("rti_to_kern", addr))
            intEndEvent->schedule(addr) ;
        else
            panic("could not find symbol: rti_to_kern\n");

        intEndEvent2 = new InterruptEndEvent(&pcEventQueue, "intEndEvent2");
        if (palSymtab->findAddress("rti_to_user", addr))
            intEndEvent2->schedule(addr);
        else
            panic("could not find symbol: rti_to_user\n");


        intEndEvent3 = new InterruptEndEvent(&pcEventQueue, "intEndEvent3");
        if (kernelSymtab->findAddress("do_softirq", addr))
            intEndEvent3->schedule(addr + sizeof(MachInst) * 2);
        else
            panic("could not find symbol: do_softirq\n");
    }
}

LinuxSystem::~LinuxSystem()
{
#ifdef DEBUG
    delete kernelPanicEvent;
#endif
    delete skipIdeDelay50msEvent;
    delete skipDelayLoopEvent;
    delete skipCacheProbeEvent;
    delete debugPrintkEvent;
    delete idleStartEvent;
    delete printThreadEvent;
    delete intStartEvent;
    delete intEndEvent;
    delete intEndEvent2;
}


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);
    }
}

BEGIN_DECLARE_SIM_OBJECT_PARAMS(LinuxSystem)

    SimObjectParam<MemoryController *> mem_ctl;
    SimObjectParam<PhysicalMemory *> physmem;

    Param<string> kernel_code;
    Param<string> console_code;
    Param<string> pal_code;

    Param<string> boot_osflags;
    Param<string> readfile;
    Param<unsigned int> init_param;

    Param<uint64_t> system_type;
    Param<uint64_t> system_rev;

    Param<bool> bin;
    VectorParam<string> binned_fns;
    Param<bool> bin_int;

END_DECLARE_SIM_OBJECT_PARAMS(LinuxSystem)

BEGIN_INIT_SIM_OBJECT_PARAMS(LinuxSystem)

    INIT_PARAM(mem_ctl, "memory controller"),
    INIT_PARAM(physmem, "phsyical memory"),
    INIT_PARAM(kernel_code, "file that contains the kernel 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_DFLT(readfile, "file to read startup script from", ""),
    INIT_PARAM_DFLT(init_param, "numerical value to pass into simulator", 0),
    INIT_PARAM_DFLT(system_type, "Type of system we are emulating", 34),
    INIT_PARAM_DFLT(system_rev, "Revision of system we are emulating", 1<<10),
    INIT_PARAM_DFLT(bin, "is this system to be binned", false),
    INIT_PARAM(binned_fns, "functions to be broken down and binned"),
    INIT_PARAM_DFLT(bin_int, "is interrupt code binned seperately?", true)

END_INIT_SIM_OBJECT_PARAMS(LinuxSystem)

CREATE_SIM_OBJECT(LinuxSystem)
{
    System::Params *p = new System::Params;
    p->name = getInstanceName();
    p->memctrl = mem_ctl;
    p->physmem = physmem;
    p->kernel_path = kernel_code;
    p->console_path = console_code;
    p->palcode = pal_code;
    p->boot_osflags = boot_osflags;
    p->init_param = init_param;
    p->readfile = readfile;
    p->system_type = system_type;
    p->system_rev = system_rev;
    p->bin = bin;
    p->binned_fns = binned_fns;
    p->bin_int = bin_int;
    return new LinuxSystem(p);
}

REGISTER_SIM_OBJECT("LinuxSystem", LinuxSystem)