xref: /gem5/src/arch/x86/bios/e820.cc

/*
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 * Authors: Gabe Black
 */

#include "arch/x86/bios/e820.hh"
#include "arch/x86/isa_traits.hh"
#include "mem/port.hh"
#include "sim/byteswap.hh"

using namespace std;
using namespace X86ISA;

template<class T>
void writeVal(T val, Port * port, Addr &addr)
{
    T guestVal = htog(val);
    port->writeBlob(addr, (uint8_t *)&guestVal, sizeof(T));
    addr += sizeof(T);
}

void X86ISA::E820Table::writeTo(Port * port, Addr countAddr, Addr addr)
{
    uint8_t e820Nr = entries.size();

    // Make sure the number of entries isn't bigger than what the kernel
    // would be capable of handling.
    assert(e820Nr <= 128);

    uint8_t guestE820Nr = htog(e820Nr);

    port->writeBlob(countAddr, (uint8_t *)&guestE820Nr, sizeof(guestE820Nr));

    for (int i = 0; i < e820Nr; i++) {
        writeVal(entries[i]->addr, port, addr);
        writeVal(entries[i]->size, port, addr);
        writeVal(entries[i]->type, port, addr);
    }
}

E820Table *
X86E820TableParams::create()
{
    return new E820Table(this);
}

E820Entry *
X86E820EntryParams::create()
{
    return new E820Entry(this);
}