fs_workload.cc

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/*
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 * All rights reserved.
 *
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 * property including but not limited to intellectual property relating
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 * 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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#include "arch/x86/linux/fs_workload.hh"
 
#include "arch/x86/regs/int.hh"
#include "base/trace.hh"
#include "cpu/pc_event.hh"
#include "cpu/thread_context.hh"
#include "kern/linux/events.hh"
#include "mem/port_proxy.hh"
#include "params/X86FsLinux.hh"
#include "sim/byteswap.hh"
#include "sim/sim_exit.hh"
#include "sim/system.hh"
 
namespace gem5
{
 
namespace X86ISA
{
 
FsLinux::FsLinux(const Params &p) :
    X86ISA::FsWorkload(p), e820Table(p.e820_table)
{}
 
void
FsLinux::startup()
{
    KernelWorkload::startup();
 
    addExitOnKernelOopsEvent();
    addExitOnKernelPanicEvent();
}
 
 
void
FsLinux::addExitOnKernelPanicEvent()
{
    const std::string dmesg_output = name() + ".dmesg";
 
    if (params().exit_on_kernel_panic) {
        // This was taken from the RISCV implementation. Some kernels may not
        // have kernel symbols, causing `kernelSymtab` to be empty.
        // In that case, addKernelFuncEvent tries to access the "panic" symbol
        // in the symbol table but can't, so the event won't be added and the
        // simulation will hang upon kernel panic.
        kernelPanicPcEvent = addKernelFuncEvent<linux::PanicOrOopsEvent>(
            "panic", "Kernel panic in simulated system.",
            dmesg_output, params().on_panic
        );
    }
}
 
void
FsLinux::addExitOnKernelOopsEvent()
{
    const std::string dmesg_output = name() + ".dmesg";
    if (params().exit_on_kernel_oops) {
        // This was taken from the RISCV implementation. Some kernels may not
        // have kernel symbols, causing `kernelSymtab` to be empty.
        // In that case, addKernelFuncEvent tries to access the "panic" symbol
        // in the symbol table but can't, so the event won't be added and the
        // simulation will continue upon kernel oops.
        kernelOopsPcEvent = addKernelFuncEvent<linux::PanicOrOopsEvent>(
            "oops_exit", "Kernel oops in simulated system.",
            dmesg_output, params().on_oops
        );
    }
}
 
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