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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>
39 lines
569 B
C
39 lines
569 B
C
/*
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* TPM stubs
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "qapi/qapi-commands-tpm.h"
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#include "sysemu/tpm.h"
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#include "hw/acpi/tpm.h"
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void tpm_init(void)
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{
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}
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void tpm_cleanup(void)
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{
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}
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TPMInfoList *qmp_query_tpm(Error **errp)
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{
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return NULL;
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}
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TpmTypeList *qmp_query_tpm_types(Error **errp)
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{
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return NULL;
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}
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TpmModelList *qmp_query_tpm_models(Error **errp)
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{
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return NULL;
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}
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void tpm_build_ppi_acpi(TPMIf *tpm, Aml *dev)
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{
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}
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