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/*
* Copyright (c) 2013 The Chromium OS Authors.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#ifndef __TPM_H
#define __TPM_H
#include <tis.h>
/*
* Here is a partial implementation of TPM commands. Please consult TCG Main
* Specification for definitions of TPM commands.
*/
enum tpm_startup_type {
TPM_ST_CLEAR = 0x0001,
TPM_ST_STATE = 0x0002,
TPM_ST_DEACTIVATED = 0x0003,
};
enum tpm_physical_presence {
TPM_PHYSICAL_PRESENCE_HW_DISABLE = 0x0200,
TPM_PHYSICAL_PRESENCE_CMD_DISABLE = 0x0100,
TPM_PHYSICAL_PRESENCE_LIFETIME_LOCK = 0x0080,
TPM_PHYSICAL_PRESENCE_HW_ENABLE = 0x0040,
TPM_PHYSICAL_PRESENCE_CMD_ENABLE = 0x0020,
TPM_PHYSICAL_PRESENCE_NOTPRESENT = 0x0010,
TPM_PHYSICAL_PRESENCE_PRESENT = 0x0008,
TPM_PHYSICAL_PRESENCE_LOCK = 0x0004,
};
enum tpm_nv_index {
TPM_NV_INDEX_LOCK = 0xffffffff,
TPM_NV_INDEX_0 = 0x00000000,
TPM_NV_INDEX_DIR = 0x10000001,
};
/**
* Initialize TPM device. It must be called before any TPM commands.
*
* @return 0 on success, non-0 on error.
*/
uint32_t tpm_init(void);
/**
* Issue a TPM_Startup command.
*
* @param mode TPM startup mode
* @return return code of the operation
*/
uint32_t tpm_startup(enum tpm_startup_type mode);
/**
* Issue a TPM_SelfTestFull command.
*
* @return return code of the operation
*/
uint32_t tpm_self_test_full(void);
/**
* Issue a TPM_ContinueSelfTest command.
*
* @return return code of the operation
*/
uint32_t tpm_continue_self_test(void);
/**
* Issue a TPM_NV_DefineSpace command. The implementation is limited
* to specify TPM_NV_ATTRIBUTES and size of the area. The area index
* could be one of the special value listed in enum tpm_nv_index.
*
* @param index index of the area
* @param perm TPM_NV_ATTRIBUTES of the area
* @param size size of the area
* @return return code of the operation
*/
uint32_t tpm_nv_define_space(uint32_t index, uint32_t perm, uint32_t size);
/**
* Issue a TPM_NV_ReadValue command. This implementation is limited
* to read the area from offset 0. The area index could be one of
* the special value listed in enum tpm_nv_index.
*
* @param index index of the area
* @param data output buffer of the area contents
* @param count size of output buffer
* @return return code of the operation
*/
uint32_t tpm_nv_read_value(uint32_t index, void *data, uint32_t count);
/**
* Issue a TPM_NV_WriteValue command. This implementation is limited
* to write the area from offset 0. The area index could be one of
* the special value listed in enum tpm_nv_index.
*
* @param index index of the area
* @param data input buffer to be wrote to the area
* @param length length of data bytes of input buffer
* @return return code of the operation
*/
uint32_t tpm_nv_write_value(uint32_t index, const void *data, uint32_t length);
/**
* Issue a TPM_Extend command.
*
* @param index index of the PCR
* @param in_digest 160-bit value representing the event to be
* recorded
* @param out_digest 160-bit PCR value after execution of the
* command
* @return return code of the operation
*/
uint32_t tpm_extend(uint32_t index, const void *in_digest, void *out_digest);
/**
* Issue a TPM_PCRRead command.
*
* @param index index of the PCR
* @param data output buffer for contents of the named PCR
* @param count size of output buffer
* @return return code of the operation
*/
uint32_t tpm_pcr_read(uint32_t index, void *data, size_t count);
/**
* Issue a TSC_PhysicalPresence command. TPM physical presence flag
* is bit-wise OR'ed of flags listed in enum tpm_physical_presence.
*
* @param presence TPM physical presence flag
* @return return code of the operation
*/
uint32_t tpm_tsc_physical_presence(uint16_t presence);
/**
* Issue a TPM_ReadPubek command.
*
* @param data output buffer for the public endorsement key
* @param count size of ouput buffer
* @return return code of the operation
*/
uint32_t tpm_read_pubek(void *data, size_t count);
/**
* Issue a TPM_ForceClear command.
*
* @return return code of the operation
*/
uint32_t tpm_force_clear(void);
/**
* Issue a TPM_PhysicalEnable command.
*
* @return return code of the operation
*/
uint32_t tpm_physical_enable(void);
/**
* Issue a TPM_PhysicalDisable command.
*
* @return return code of the operation
*/
uint32_t tpm_physical_disable(void);
/**
* Issue a TPM_PhysicalSetDeactivated command.
*
* @param state boolean state of the deactivated flag
* @return return code of the operation
*/
uint32_t tpm_physical_set_deactivated(uint8_t state);
/**
* Issue a TPM_GetCapability command. This implementation is limited
* to query sub_cap index that is 4-byte wide.
*
* @param cap_area partition of capabilities
* @param sub_cap further definition of capability, which is
* limited to be 4-byte wide
* @param cap output buffer for capability information
* @param count size of ouput buffer
* @return return code of the operation
*/
uint32_t tpm_get_capability(uint32_t cap_area, uint32_t sub_cap,
void *cap, size_t count);
#endif /* __TPM_H */
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