fs_workload.cc

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/*
 * Copyright (c) 2007-2008 The Hewlett-Packard Development Company
 * All rights reserved.
 *
 * The license below extends only to copyright in the software and shall
 * not be construed as granting a license to any other intellectual
 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
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 * modified or unmodified, in source code or in binary form.
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 * met: redistributions of source code must retain the above copyright
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 * redistributions in binary form must reproduce the above copyright
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#include "arch/x86/linux/fs_workload.hh"
 
#include "arch/x86/regs/int.hh"
#include "base/trace.hh"
#include "cpu/thread_context.hh"
#include "mem/port_proxy.hh"
#include "params/X86FsLinux.hh"
#include "sim/byteswap.hh"
#include "sim/system.hh"
 
namespace gem5
{
 
namespace X86ISA
{
 
FsLinux::FsLinux(const Params &p) :
    X86ISA::FsWorkload(p), e820Table(p.e820_table)
{}
 
void
FsLinux::initState()
{
    X86ISA::FsWorkload::initState();
 
    auto phys_proxy = system->physProxy;
 
    // The location of the real mode data structure.
    const Addr realModeData = 0x90200;
 
    /*
     * 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;
 
    panic_if(commandLine.length() + 1 > realModeData - commandLineBuff,
             "Command line \"%s\" is longer than %d characters.",
                commandLine, realModeData - commandLineBuff - 1);
    phys_proxy.writeString(commandLineBuff, commandLine.c_str());
 
    // Generate a pointer of the right size and endianness to put into
    // commandLinePointer.
    uint32_t guestCommandLineBuff = htole((uint32_t)commandLineBuff);
    phys_proxy.writeBlob(commandLinePointer, &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(phys_proxy, 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.
     */
    system->threads[0]->setReg(int_reg::Rsi, realModeData);
}
 
} // namespace X86ISA
} // namespace gem5