efi_loader: add SMBIOS table measurement

TCG PC Client Platform Firmware Profile Specification
requires to measure the SMBIOS table that contains static
configuration information (e.g. Platform Manufacturer
Enterprise Number assigned by IANA, platform model number,
Vendor and Device IDs for each SMBIOS table).

The device- and environment-dependent information such as
serial number is cleared to zero or space character for
the measurement.

Existing smbios_string() function returns pointer to the string
with const qualifier, but exisintg use case is updating version
string and const qualifier must be removed.
This commit removes const qualifier from smbios_string()
return value and reuses to clear the strings for the measurement.

This commit also fixes the following compiler warning:

lib/smbios-parser.c:59:39: warning: cast to pointer from integer of
different size [-Wint-to-pointer-cast]
  const struct smbios_header *header = (struct smbios_header *)entry->struct_table_address;

Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/efi_loader.h b/include/efi_loader.h
index f6d65a6c0c2..d0433ea52e4 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -308,6 +308,8 @@ extern const efi_guid_t efi_guid_capsule_report;
 extern const efi_guid_t efi_guid_firmware_management_protocol;
 /* GUID for the ESRT */
 extern const efi_guid_t efi_esrt_guid;
+/* GUID of the SMBIOS table */
+extern const efi_guid_t smbios_guid;
 
 extern char __efi_runtime_start[], __efi_runtime_stop[];
 extern char __efi_runtime_rel_start[], __efi_runtime_rel_stop[];