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