lib/efi_loader/efi_smbios.c

   1 /*
   2  *  EFI application tables support
   3  *
   4  *  Copyright (c) 2016 Alexander Graf
   5  *
   6  *  SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <efi_loader.h>
  11 #include <inttypes.h>
  12 #include <smbios.h>
  13
  14 static const efi_guid_t smbios_guid = SMBIOS_TABLE_GUID;
  15
  16 void efi_smbios_register(void)
  17 {
  18         /* Map within the low 32 bits, to allow for 32bit SMBIOS tables */
  19         uint64_t dmi = 0xffffffff;
  20         /* Reserve 4kb for SMBIOS */
  21         uint64_t pages = 1;
  22         int memtype = EFI_RUNTIME_SERVICES_DATA;
  23
  24         if (efi_allocate_pages(1, memtype, pages, &dmi) != EFI_SUCCESS)
  25                 return;
  26
  27         /* Generate SMBIOS tables */
  28         write_smbios_table(dmi);
  29
  30         /* And expose them to our EFI payload */
  31         efi_install_configuration_table(&smbios_guid, (void*)(uintptr_t)dmi);
  32 }