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52 lines
1.7 KiB
52 lines
1.7 KiB
/****************************************************************************** |
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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[]; /* grant IDs; length in nr_extra_pages */ |
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}; |
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#endif
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