[PATCH v7 1/2] acpi: Extend TPM2 ACPI table with missing log fields

From: Stefan Berger
Date: Thu Jun 25 2020 - 17:50:15 EST


From: Stefan Berger <stefanb@xxxxxxxxxxxxx>

Recent extensions of the TPM2 ACPI table added 3 more fields
including 12 bytes of start method specific parameters and Log Area
Minimum Length (u32) and Log Area Start Address (u64). So, we define
a new structure acpi_tpm2_phy that holds these optional new fields.
The new fields allow non-UEFI systems to access the TPM2's log.

The specification that has the new fields is the following:
TCG ACPI Specification
Family "1.2" and "2.0"
Version 1.2, Revision 8

https://trustedcomputinggroup.org/wp-content/uploads/TCG_ACPIGeneralSpecification_v1.20_r8.pdf

Signed-off-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>
Cc: linux-acpi@xxxxxxxxxxxxxxx
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
---
include/acpi/actbl3.h | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/include/acpi/actbl3.h b/include/acpi/actbl3.h
index b0b163b9efc6..bdcac69fa6bd 100644
--- a/include/acpi/actbl3.h
+++ b/include/acpi/actbl3.h
@@ -415,6 +415,13 @@ struct acpi_table_tpm2 {
/* Platform-specific data follows */
};

+/* Optional trailer for revision 4 holding platform-specific data */
+struct acpi_tpm2_phy {
+ u8 start_method_specific[12];
+ u32 log_area_minimum_length;
+ u64 log_area_start_address;
+};
+
/* Values for start_method above */

#define ACPI_TPM2_NOT_ALLOWED 0
--
2.26.2