qemu_fw_cfg.cc

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/*
 * Copyright 2022 Google, Inc.
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 * modification, are permitted provided that the following conditions are
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 * notice, this list of conditions and the following disclaimer;
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 *
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#include "dev/x86/qemu_fw_cfg.hh"
 
#include "arch/x86/bios/e820.hh"
#include "base/compiler.hh"
#include "base/logging.hh"
#include "sim/byteswap.hh"
 
namespace gem5
{
 
namespace qemu
{
 
FwCfgItemE820::FwCfgItemE820(const QemuFwCfgItemE820Params &p) :
    FwCfgItemFixed(p.path, p.arch_specific, p.index)
{
    struct GEM5_PACKED Entry
    {
        uint64_t addr;
        uint64_t size;
        uint32_t type;
    };
 
    uint32_t count = p.entries.size();
 
    panic_if(count >= 128, "Too many E820 entries (%d).", count);
 
    size_t bytes = count * sizeof(Entry);
    data.resize(bytes);
 
    uint8_t *ptr = data.data();
 
    // Write out the e820 entries.
    for (auto *e: p.entries) {
        Entry entry{htole(e->addr), htole(e->size), htole(e->type)};
        std::memcpy(ptr, &entry, sizeof(entry));
        ptr += sizeof(entry);
    }
};
 
} // namespace qemu
} // namespace gem5