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/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/*
* TPM Lightweight Command Library.
*
* A low-level library for interfacing to TPM hardware or an emulator.
*/
#ifndef TPM_LITE_TLCL_H_
#define TPM_LITE_TLCL_H_
#include <stdint.h>
#include "tss_constants.h"
/*****************************************************************************/
/* Functions implemented in tlcl.c */
/**
* Call this first. Returns 0 if success, nonzero if error.
*/
uint32_t TlclLibInit(void);
/**
* Call this on shutdown. Returns 0 if success, nonzero if error.
*/
uint32_t TlclLibClose(void);
/* Low-level operations */
/**
* Perform a raw TPM request/response transaction.
*/
uint32_t TlclSendReceive(const uint8_t *request, uint8_t *response,
int max_length);
/**
* Return the size of a TPM request or response packet.
*/
int TlclPacketSize(const uint8_t *packet);
/* Commands */
/**
* Send a TPM_Startup(ST_CLEAR). The TPM error code is returned (0 for
* success).
*/
uint32_t TlclStartup(void);
/**
* Save the TPM state. Normally done by the kernel before a suspend, included
* here for tests. The TPM error code is returned (0 for success).
*/
uint32_t TlclSaveState(void);
/**
* Resume by sending a TPM_Startup(ST_STATE). The TPM error code is returned
* (0 for success).
*/
uint32_t TlclResume(void);
/**
* Run the self test.
*
* Note---this is synchronous. To run this in parallel with other firmware,
* use ContinueSelfTest(). The TPM error code is returned.
*/
uint32_t TlclSelfTestFull(void);
/**
* Run the self test in the background.
*/
uint32_t TlclContinueSelfTest(void);
/**
* Define a space with permission [perm]. [index] is the index for the space,
* [size] the usable data size. The TPM error code is returned.
*/
uint32_t TlclDefineSpace(uint32_t index, uint32_t perm, uint32_t size);
/**
* Write [length] bytes of [data] to space at [index]. The TPM error code is
* returned.
*/
uint32_t TlclWrite(uint32_t index, const void *data, uint32_t length);
/**
* Read [length] bytes from space at [index] into [data]. The TPM error code
* is returned.
*/
uint32_t TlclRead(uint32_t index, void *data, uint32_t length);
/**
* Read PCR at [index] into [data]. [length] must be TPM_PCR_DIGEST or
* larger. The TPM error code is returned.
*/
uint32_t TlclPCRRead(uint32_t index, void *data, uint32_t length);
/**
* Write-lock space at [index]. The TPM error code is returned.
*/
uint32_t TlclWriteLock(uint32_t index);
/**
* Read-lock space at [index]. The TPM error code is returned.
*/
uint32_t TlclReadLock(uint32_t index);
/**
* Assert physical presence in software. The TPM error code is returned.
*/
uint32_t TlclAssertPhysicalPresence(void);
/**
* Enable the physical presence command. The TPM error code is returned.
*/
uint32_t TlclPhysicalPresenceCMDEnable(void);
/**
* Finalize the physical presence settings: sofware PP is enabled, hardware PP
* is disabled, and the lifetime lock is set. The TPM error code is returned.
*/
uint32_t TlclFinalizePhysicalPresence(void);
uint32_t TlclAssertPhysicalPresenceResult(void);
/**
* Turn off physical presence and locks it off until next reboot. The TPM
* error code is returned.
*/
uint32_t TlclLockPhysicalPresence(void);
/**
* Set the nvLocked bit. The TPM error code is returned.
*/
uint32_t TlclSetNvLocked(void);
/**
* Return 1 if the TPM is owned, 0 otherwise.
*/
int TlclIsOwned(void);
/**
* Issue a ForceClear. The TPM error code is returned.
*/
uint32_t TlclForceClear(void);
/**
* Issue a PhysicalEnable. The TPM error code is returned.
*/
uint32_t TlclSetEnable(void);
/**
* Issue a PhysicalDisable. The TPM error code is returned.
*/
uint32_t TlclClearEnable(void);
/**
* Issue a SetDeactivated. Pass 0 to activate. Returns result code.
*/
uint32_t TlclSetDeactivated(uint8_t flag);
/**
* Get flags of interest. Pointers for flags you aren't interested in may
* be NULL. The TPM error code is returned.
*/
uint32_t TlclGetFlags(uint8_t *disable, uint8_t *deactivated,
uint8_t *nvlocked);
/**
* Set the bGlobalLock flag, which only a reboot can clear. The TPM error
* code is returned.
*/
uint32_t TlclSetGlobalLock(void);
/**
* Perform a TPM_Extend.
*/
uint32_t TlclExtend(int pcr_num, const uint8_t *in_digest, uint8_t *out_digest);
/**
* Get the permission bits for the NVRAM space with |index|.
*/
uint32_t TlclGetPermissions(uint32_t index, uint32_t *permissions);
/**
* Get the entire set of permanent flags.
*/
uint32_t TlclGetPermanentFlags(TPM_PERMANENT_FLAGS *pflags);
/**
* Get the entire set of volatile (ST_CLEAR) flags.
*/
uint32_t TlclGetSTClearFlags(TPM_STCLEAR_FLAGS *pflags);
/**
* Get the ownership flag. The TPM error code is returned.
*/
uint32_t TlclGetOwnership(uint8_t *owned);
/**
* Request [length] bytes from TPM RNG to be stored in [data]. Actual number of
* bytes read is stored in [size]. The TPM error code is returned.
*/
uint32_t TlclGetRandom(uint8_t *data, uint32_t length, uint32_t *size);
#endif /* TPM_LITE_TLCL_H_ */
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