53 lines
1.7 KiB
C
53 lines
1.7 KiB
C
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/******************************************************************************
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* tpmif.h
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*
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* TPM I/O interface for Xen guest OSes, v2
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*
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* This file is in the public domain.
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*
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*/
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#ifndef __XEN_PUBLIC_IO_TPMIF_H__
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#define __XEN_PUBLIC_IO_TPMIF_H__
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/*
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* Xenbus state machine
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*
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* Device open:
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* 1. Both ends start in XenbusStateInitialising
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* 2. Backend transitions to InitWait (frontend does not wait on this step)
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* 3. Frontend populates ring-ref, event-channel, feature-protocol-v2
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* 4. Frontend transitions to Initialised
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* 5. Backend maps grant and event channel, verifies feature-protocol-v2
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* 6. Backend transitions to Connected
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* 7. Frontend verifies feature-protocol-v2, transitions to Connected
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*
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* Device close:
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* 1. State is changed to XenbusStateClosing
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* 2. Frontend transitions to Closed
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* 3. Backend unmaps grant and event, changes state to InitWait
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*/
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enum vtpm_shared_page_state {
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VTPM_STATE_IDLE, /* no contents / vTPM idle / cancel complete */
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VTPM_STATE_SUBMIT, /* request ready / vTPM working */
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VTPM_STATE_FINISH, /* response ready / vTPM idle */
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VTPM_STATE_CANCEL, /* cancel requested / vTPM working */
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};
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/* The backend should only change state to IDLE or FINISH, while the
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* frontend should only change to SUBMIT or CANCEL. */
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struct vtpm_shared_page {
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uint32_t length; /* request/response length in bytes */
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uint8_t state; /* enum vtpm_shared_page_state */
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uint8_t locality; /* for the current request */
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uint8_t pad;
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uint8_t nr_extra_pages; /* extra pages for long packets; may be zero */
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uint32_t extra_pages[0]; /* grant IDs; length in nr_extra_pages */
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};
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#endif
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