From 0fe246690315335a40a132f05cb6fdc7bfb9adca Mon Sep 17 00:00:00 2001 From: Stefan Berger Date: Tue, 15 Jan 2019 02:27:51 +0400 Subject: acpi: expose TPM/PPI configuration parameters to firmware via fw_cfg MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit To avoid having to hard code the base address of the PPI virtual memory device we introduce a fw_cfg file etc/tpm/config that holds the base address of the PPI device, the version of the PPI interface and the version of the attached TPM. Signed-off-by: Stefan Berger [ Marc-André: renamed to etc/tpm/config, made it static, document it ] Signed-off-by: Marc-André Lureau Acked-by: Michael S. Tsirkin Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Michael S. Tsirkin Tested-by: Stefan Berger Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- docs/specs/tpm.txt | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'docs') diff --git a/docs/specs/tpm.txt b/docs/specs/tpm.txt index 1af82bba86..e4bb094700 100644 --- a/docs/specs/tpm.txt +++ b/docs/specs/tpm.txt @@ -34,6 +34,25 @@ The CRB interface makes a memory mapped IO region in the area 0xfed40000 - QEMU files related to TPM CRB interface: - hw/tpm/tpm_crb.c += fw_cfg interface = + +The bios/firmware may read the "etc/tpm/config" fw_cfg entry for +configuring the guest appropriately. + +The entry of 6 bytes has the following content, in little-endian: + + #define TPM_VERSION_UNSPEC 0 + #define TPM_VERSION_1_2 1 + #define TPM_VERSION_2_0 2 + + #define TPM_PPI_VERSION_NONE 0 + #define TPM_PPI_VERSION_1_30 1 + + struct FwCfgTPMConfig { + uint32_t tpmppi_address; /* PPI memory location */ + uint8_t tpm_version; /* TPM version */ + uint8_t tpmppi_version; /* PPI version */ + }; = ACPI Interface = -- cgit v1.2.3