OvmfPkg/Bhyve/SmbiosPlatformDxe/Bhyve.c

/*
 * Copyright (c) 2020, Rebecca Cran <rebecca@bsdio.com>
 * Copyright (c) 2014, Pluribus Networks, Inc.
 *
 * SPDX-License-Identifier: BSD-2-Clause-Patent
 */

#include "SmbiosPlatformDxe.h"

#define BHYVE_SMBIOS_PHYSICAL_ADDRESS  0x000F0000
#define BHYVE_SMBIOS_PHYSICAL_END      0x000FFFFF

/**
  Locates the bhyve SMBIOS data if it exists

  @return SMBIOS_TABLE_ENTRY_POINT   Address of bhyve SMBIOS data

**/
SMBIOS_TABLE_ENTRY_POINT *
GetBhyveSmbiosTables (
  VOID
  )
{
  UINT8                     *BhyveSmbiosPtr;
  SMBIOS_TABLE_ENTRY_POINT  *BhyveSmbiosEntryPointStructure;

  for (BhyveSmbiosPtr = (UINT8 *)(UINTN)BHYVE_SMBIOS_PHYSICAL_ADDRESS;
       BhyveSmbiosPtr < (UINT8 *)(UINTN)BHYVE_SMBIOS_PHYSICAL_END;
       BhyveSmbiosPtr += 0x10)
  {
    BhyveSmbiosEntryPointStructure = (SMBIOS_TABLE_ENTRY_POINT *)BhyveSmbiosPtr;

    if (!AsciiStrnCmp ((CHAR8 *)BhyveSmbiosEntryPointStructure->AnchorString, "_SM_", 4) &&
        !AsciiStrnCmp ((CHAR8 *)BhyveSmbiosEntryPointStructure->IntermediateAnchorString, "_DMI_", 5) &&
        IsEntryPointStructureValid (BhyveSmbiosEntryPointStructure))
    {
      return BhyveSmbiosEntryPointStructure;
    }
  }

  return NULL;
}