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acpi: build TPM Physical Presence interface

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The TPM Physical Presence interface consists of an ACPI part, a shared
memory part, and code in the firmware. Users can send messages to the
firmware by writing a code into the shared memory through invoking the
ACPI code. When a reboot happens, the firmware looks for the code and
acts on it by sending sequences of commands to the TPM.

This patch adds the ACPI code. It is similar to the one in EDK2 but doesn't
assume that SMIs are necessary to use. It uses a similar datastructure for
the shared memory as EDK2 does so that EDK2 and SeaBIOS could both make use
of it. I extended the shared memory data structure with an array of 256
bytes, one for each code that could be implemented. The array contains
flags describing the individual codes. This decouples the ACPI implementation
from the firmware implementation.

The underlying TCG specification is accessible from the following page.

https://trustedcomputinggroup.org/tcg-physical-presence-interface-specification/

This patch implements version 1.30.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
[ Marc-André - ACPI code improvements and windows fixes ]
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Stefan Berger <stefanb@linux.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Stefan Berger 2019-01-15 02:27:52 +04:00 • committed by Michael S. Tsirkin
parent 0fe2466903
commit ac6dd31e3f
6 changed files with 514 additions and 3 deletions
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12
include/hw/acpi/tpm.h
View file

@ -18,6 +18,8 @@
#include "qemu/units.h"
#include "hw/registerfields.h"
#include "hw/acpi/aml-build.h"
#include "sysemu/tpm.h"
#define TPM_TIS_ADDR_BASE 0xFED40000
#define TPM_TIS_ADDR_SIZE 0x5000
@ -197,4 +199,14 @@ REG32(CRB_DATA_BUFFER, 0x80)
#define TPM_PPI_VERSION_NONE 0
#define TPM_PPI_VERSION_1_30 1
/* whether function is blocked by BIOS settings; bits 0, 1, 2 */
#define TPM_PPI_FUNC_NOT_IMPLEMENTED (0 << 0)
#define TPM_PPI_FUNC_BIOS_ONLY (1 << 0)
#define TPM_PPI_FUNC_BLOCKED (2 << 0)
#define TPM_PPI_FUNC_ALLOWED_USR_REQ (3 << 0)
#define TPM_PPI_FUNC_ALLOWED_USR_NOT_REQ (4 << 0)
#define TPM_PPI_FUNC_MASK (7 << 0)
void tpm_build_ppi_acpi(TPMIf *tpm, Aml *dev);
#endif /* HW_ACPI_TPM_H */