src/arch/x86/linux/system.cc

/*
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 * All rights reserved.
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 *
 * Redistributions of source code must retain the above copyright notice,
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 * Non-Commercial Uses.  Derivatives of the software may be shared with
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 * and (ii) such Derivatives of the software include the above copyright
 * notice to acknowledge the contribution from this software where
 * applicable, this list of conditions and the disclaimer below.
 *
 * 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
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 * Authors: Gabe Black
 */

#include "arch/x86/intregs.hh"
#include "arch/x86/linux/system.hh"
#include "arch/vtophys.hh"
#include "base/trace.hh"
#include "cpu/thread_context.hh"
#include "mem/physical.hh"
#include "params/LinuxX86System.hh"


using namespace LittleEndianGuest;
using namespace X86ISA;

LinuxX86System::LinuxX86System(Params *p)
    : X86System(p), commandLine(p->boot_osflags), e820Table(p->e820_table)
{
}

LinuxX86System::~LinuxX86System()
{
}

void
LinuxX86System::startup()
{
    X86System::startup();

    // The location of the real mode data structure.
    const Addr realModeData = 0x90200;

    // A port to write to memory.
    FunctionalPort * physPort = threadContexts[0]->getPhysPort();

    /*
     * Deal with the command line stuff.
     */

    // A buffer to store the command line.
    const Addr commandLineBuff = 0x90000;
    // A pointer to the commandLineBuff stored in the real mode data.
    const Addr commandLinePointer = realModeData + 0x228;

    if (commandLine.length() + 1 > realModeData - commandLineBuff)
        panic("Command line \"%s\" is longer than %d characters.\n",
                commandLine, realModeData - commandLineBuff - 1);
    physPort->writeBlob(commandLineBuff,
            (uint8_t *)commandLine.c_str(), commandLine.length() + 1);

    // Generate a pointer of the right size and endianness to put into
    // commandLinePointer.
    uint32_t guestCommandLineBuff =
        X86ISA::htog((uint32_t)commandLineBuff);
    physPort->writeBlob(commandLinePointer,
            (uint8_t *)&guestCommandLineBuff, sizeof(guestCommandLineBuff));

    /*
     * Screen Info.
     */

    // We'll skip on this for now because it's only needed for framebuffers,
    // something we don't support at the moment.

    /*
     * EDID info
     */

    // Skipping for now.

    /*
     * Saved video mode
     */

    // Skipping for now.

    /*
     * Loader type.
     */

    // Skipping for now.

    /*
     * E820 memory map
     */

    // A pointer to the number of E820 entries there are.
    const Addr e820MapNrPointer = realModeData + 0x1e8;

    // A pointer to the buffer for E820 entries.
    const Addr e820MapPointer = realModeData + 0x2d0;

    e820Table->writeTo(physPort, e820MapNrPointer, e820MapPointer);

    /*
     * Pass the location of the real mode data structure to the kernel
     * using register %esi. We'll use %rsi which should be equivalent.
     */
    threadContexts[0]->setIntReg(INTREG_RSI, realModeData);
}

LinuxX86System *
LinuxX86SystemParams::create()
{
    return new LinuxX86System(this);
}