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, 15 insertions, 0 deletions

diff --git a/include/efi_tcg2.h b/include/efi_tcg2.h
index 8f02d4fb0b..ca66695b39 100644
--- a/include/efi_tcg2.h
+++ b/include/efi_tcg2.h
@@ -210,6 +210,21 @@ struct efi_tcg2_uefi_variable_data {
 	u8 variable_data[1];
 };
 
+/**
+ * struct tdUEFI_HANDOFF_TABLE_POINTERS2 - event log structure of SMBOIS tables
+ * @table_description_size:	size of table description
+ * @table_description:		table description
+ * @number_of_tables:		number of uefi configuration table
+ * @table_entry:		uefi configuration table entry
+ */
+#define SMBIOS_HANDOFF_TABLE_DESC  "SmbiosTable"
+struct smbios_handoff_table_pointers2 {
+	u8 table_description_size;
+	u8 table_description[sizeof(SMBIOS_HANDOFF_TABLE_DESC)];
+	u64 number_of_tables;
+	struct efi_configuration_table table_entry[];
+} __packed;
+
 struct efi_tcg2_protocol {
 	efi_status_t (EFIAPI * get_capability)(struct efi_tcg2_protocol *this,
 					       struct efi_tcg2_boot_service_capability *capability);