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u-boot/include/tpm-v2.h
Heinrich Schuchardt 185f812c41 doc: replace @return by Return: 
Sphinx expects Return: and not @return to indicate a return value.

find . -name '*.c' -exec \
sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \;

find . -name '*.h' -exec \
sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \;

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
2022-01-19 18:11:34 +01:00

662 lines
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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Defines APIs and structures that allow software to interact with a
* TPM2 device
*
* Copyright (c) 2020 Linaro
* Copyright (c) 2018 Bootlin
*
* https://trustedcomputinggroup.org/resource/tss-overview-common-structures-specification/
*
* Author: Miquel Raynal <miquel.raynal@bootlin.com>
*/
#ifndef __TPM_V2_H
#define __TPM_V2_H
#include <tpm-common.h>
struct udevice;
#define TPM2_DIGEST_LEN 32
#define TPM2_SHA1_DIGEST_SIZE 20
#define TPM2_SHA256_DIGEST_SIZE 32
#define TPM2_SHA384_DIGEST_SIZE 48
#define TPM2_SHA512_DIGEST_SIZE 64
#define TPM2_SM3_256_DIGEST_SIZE 32
#define TPM2_MAX_PCRS 32
#define TPM2_PCR_SELECT_MAX ((TPM2_MAX_PCRS + 7) / 8)
#define TPM2_MAX_CAP_BUFFER 1024
#define TPM2_MAX_TPM_PROPERTIES ((TPM2_MAX_CAP_BUFFER - sizeof(u32) /* TPM2_CAP */ - \
sizeof(u32)) / sizeof(struct tpms_tagged_property))
#define TPM2_HDR_LEN 10
/*
* We deviate from this draft of the specification by increasing the value of
* TPM2_NUM_PCR_BANKS from 3 to 16 to ensure compatibility with TPM2
* implementations that have enabled a larger than typical number of PCR
* banks. This larger value for TPM2_NUM_PCR_BANKS is expected to be included
* in a future revision of the specification.
*/
#define TPM2_NUM_PCR_BANKS 16
/* Definition of (UINT32) TPM2_CAP Constants */
#define TPM2_CAP_PCRS 0x00000005U
#define TPM2_CAP_TPM_PROPERTIES 0x00000006U
/* Definition of (UINT32) TPM2_PT Constants */
#define TPM2_PT_GROUP (u32)(0x00000100)
#define TPM2_PT_FIXED (u32)(TPM2_PT_GROUP * 1)
#define TPM2_PT_MANUFACTURER (u32)(TPM2_PT_FIXED + 5)
#define TPM2_PT_PCR_COUNT (u32)(TPM2_PT_FIXED + 18)
#define TPM2_PT_MAX_COMMAND_SIZE (u32)(TPM2_PT_FIXED + 30)
#define TPM2_PT_MAX_RESPONSE_SIZE (u32)(TPM2_PT_FIXED + 31)
/*
* event types, cf.
* "TCG Server Management Domain Firmware Profile Specification",
* rev 1.00, 2020-05-01
*/
#define EV_POST_CODE ((u32)0x00000001)
#define EV_NO_ACTION ((u32)0x00000003)
#define EV_SEPARATOR ((u32)0x00000004)
#define EV_ACTION ((u32)0x00000005)
#define EV_TAG ((u32)0x00000006)
#define EV_S_CRTM_CONTENTS ((u32)0x00000007)
#define EV_S_CRTM_VERSION ((u32)0x00000008)
#define EV_CPU_MICROCODE ((u32)0x00000009)
#define EV_PLATFORM_CONFIG_FLAGS ((u32)0x0000000A)
#define EV_TABLE_OF_DEVICES ((u32)0x0000000B)
#define EV_COMPACT_HASH ((u32)0x0000000C)
/*
* event types, cf.
* "TCG PC Client Platform Firmware Profile Specification", Family "2.0"
* Level 00 Version 1.05 Revision 23, May 7, 2021
*/
#define EV_EFI_EVENT_BASE ((u32)0x80000000)
#define EV_EFI_VARIABLE_DRIVER_CONFIG ((u32)0x80000001)
#define EV_EFI_VARIABLE_BOOT ((u32)0x80000002)
#define EV_EFI_BOOT_SERVICES_APPLICATION ((u32)0x80000003)
#define EV_EFI_BOOT_SERVICES_DRIVER ((u32)0x80000004)
#define EV_EFI_RUNTIME_SERVICES_DRIVER ((u32)0x80000005)
#define EV_EFI_GPT_EVENT ((u32)0x80000006)
#define EV_EFI_ACTION ((u32)0x80000007)
#define EV_EFI_PLATFORM_FIRMWARE_BLOB ((u32)0x80000008)
#define EV_EFI_HANDOFF_TABLES ((u32)0x80000009)
#define EV_EFI_PLATFORM_FIRMWARE_BLOB2 ((u32)0x8000000A)
#define EV_EFI_HANDOFF_TABLES2 ((u32)0x8000000B)
#define EV_EFI_VARIABLE_BOOT2 ((u32)0x8000000C)
#define EV_EFI_HCRTM_EVENT ((u32)0x80000010)
#define EV_EFI_VARIABLE_AUTHORITY ((u32)0x800000E0)
#define EV_EFI_SPDM_FIRMWARE_BLOB ((u32)0x800000E1)
#define EV_EFI_SPDM_FIRMWARE_CONFIG ((u32)0x800000E2)
#define EFI_CALLING_EFI_APPLICATION \
"Calling EFI Application from Boot Option"
#define EFI_RETURNING_FROM_EFI_APPLICATION \
"Returning from EFI Application from Boot Option"
#define EFI_EXIT_BOOT_SERVICES_INVOCATION \
"Exit Boot Services Invocation"
#define EFI_EXIT_BOOT_SERVICES_FAILED \
"Exit Boot Services Returned with Failure"
#define EFI_EXIT_BOOT_SERVICES_SUCCEEDED \
"Exit Boot Services Returned with Success"
/* TPMS_TAGGED_PROPERTY Structure */
struct tpms_tagged_property {
u32 property;
u32 value;
} __packed;
/* TPMS_PCR_SELECTION Structure */
struct tpms_pcr_selection {
u16 hash;
u8 size_of_select;
u8 pcr_select[TPM2_PCR_SELECT_MAX];
} __packed;
/* TPML_PCR_SELECTION Structure */
struct tpml_pcr_selection {
u32 count;
struct tpms_pcr_selection selection[TPM2_NUM_PCR_BANKS];
} __packed;
/* TPML_TAGGED_TPM_PROPERTY Structure */
struct tpml_tagged_tpm_property {
u32 count;
struct tpms_tagged_property tpm_property[TPM2_MAX_TPM_PROPERTIES];
} __packed;
/* TPMU_CAPABILITIES Union */
union tpmu_capabilities {
/*
* Non exhaustive. Only added the structs needed for our
* current code
*/
struct tpml_pcr_selection assigned_pcr;
struct tpml_tagged_tpm_property tpm_properties;
} __packed;
/* TPMS_CAPABILITY_DATA Structure */
struct tpms_capability_data {
u32 capability;
union tpmu_capabilities data;
} __packed;
/**
* SHA1 Event Log Entry Format
*
* @pcr_index: PCRIndex event extended to
* @event_type: Type of event (see EFI specs)
* @digest: Value extended into PCR index
* @event_size: Size of event
* @event: Event data
*/
struct tcg_pcr_event {
u32 pcr_index;
u32 event_type;
u8 digest[TPM2_SHA1_DIGEST_SIZE];
u32 event_size;
u8 event[];
} __packed;
/**
* Definition of TPMU_HA Union
*/
union tmpu_ha {
u8 sha1[TPM2_SHA1_DIGEST_SIZE];
u8 sha256[TPM2_SHA256_DIGEST_SIZE];
u8 sm3_256[TPM2_SM3_256_DIGEST_SIZE];
u8 sha384[TPM2_SHA384_DIGEST_SIZE];
u8 sha512[TPM2_SHA512_DIGEST_SIZE];
} __packed;
/**
* Definition of TPMT_HA Structure
*
* @hash_alg: Hash algorithm defined in enum tpm2_algorithms
* @digest: Digest value for a given algorithm
*/
struct tpmt_ha {
u16 hash_alg;
union tmpu_ha digest;
} __packed;
/**
* Definition of TPML_DIGEST_VALUES Structure
*
* @count: Number of algorithms supported by hardware
* @digests: struct for algorithm id and hash value
*/
struct tpml_digest_values {
u32 count;
struct tpmt_ha digests[TPM2_NUM_PCR_BANKS];
} __packed;
/**
* Crypto Agile Log Entry Format
*
* @pcr_index: PCRIndex event extended to
* @event_type: Type of event
* @digests: List of digestsextended to PCR index
* @event_size: Size of the event data
* @event: Event data
*/
struct tcg_pcr_event2 {
u32 pcr_index;
u32 event_type;
struct tpml_digest_values digests;
u32 event_size;
u8 event[];
} __packed;
/**
* TPM2 Structure Tags for command/response buffers.
*
* @TPM2_ST_NO_SESSIONS: the command does not need an authentication.
* @TPM2_ST_SESSIONS: the command needs an authentication.
*/
enum tpm2_structures {
TPM2_ST_NO_SESSIONS = 0x8001,
TPM2_ST_SESSIONS = 0x8002,
};
/**
* TPM2 type of boolean.
*/
enum tpm2_yes_no {
TPMI_YES = 1,
TPMI_NO = 0,
};
/**
* TPM2 startup values.
*
* @TPM2_SU_CLEAR: reset the internal state.
* @TPM2_SU_STATE: restore saved state (if any).
*/
enum tpm2_startup_types {
TPM2_SU_CLEAR = 0x0000,
TPM2_SU_STATE = 0x0001,
};
/**
* TPM2 permanent handles.
*
* @TPM2_RH_OWNER: refers to the 'owner' hierarchy.
* @TPM2_RS_PW: indicates a password.
* @TPM2_RH_LOCKOUT: refers to the 'lockout' hierarchy.
* @TPM2_RH_ENDORSEMENT: refers to the 'endorsement' hierarchy.
* @TPM2_RH_PLATFORM: refers to the 'platform' hierarchy.
*/
enum tpm2_handles {
TPM2_RH_OWNER = 0x40000001,
TPM2_RS_PW = 0x40000009,
TPM2_RH_LOCKOUT = 0x4000000A,
TPM2_RH_ENDORSEMENT = 0x4000000B,
TPM2_RH_PLATFORM = 0x4000000C,
};
/**
* TPM2 command codes used at the beginning of a buffer, gives the command.
*
* @TPM2_CC_STARTUP: TPM2_Startup().
* @TPM2_CC_SELF_TEST: TPM2_SelfTest().
* @TPM2_CC_CLEAR: TPM2_Clear().
* @TPM2_CC_CLEARCONTROL: TPM2_ClearControl().
* @TPM2_CC_HIERCHANGEAUTH: TPM2_HierarchyChangeAuth().
* @TPM2_CC_PCR_SETAUTHPOL: TPM2_PCR_SetAuthPolicy().
* @TPM2_CC_DAM_RESET: TPM2_DictionaryAttackLockReset().
* @TPM2_CC_DAM_PARAMETERS: TPM2_DictionaryAttackParameters().
* @TPM2_CC_GET_CAPABILITY: TPM2_GetCapibility().
* @TPM2_CC_GET_RANDOM: TPM2_GetRandom().
* @TPM2_CC_PCR_READ: TPM2_PCR_Read().
* @TPM2_CC_PCR_EXTEND: TPM2_PCR_Extend().
* @TPM2_CC_PCR_SETAUTHVAL: TPM2_PCR_SetAuthValue().
*/
enum tpm2_command_codes {
TPM2_CC_STARTUP = 0x0144,
TPM2_CC_SELF_TEST = 0x0143,
TPM2_CC_HIER_CONTROL = 0x0121,
TPM2_CC_CLEAR = 0x0126,
TPM2_CC_CLEARCONTROL = 0x0127,
TPM2_CC_HIERCHANGEAUTH = 0x0129,
TPM2_CC_NV_DEFINE_SPACE = 0x012a,
TPM2_CC_PCR_SETAUTHPOL = 0x012C,
TPM2_CC_NV_WRITE = 0x0137,
TPM2_CC_NV_WRITELOCK = 0x0138,
TPM2_CC_DAM_RESET = 0x0139,
TPM2_CC_DAM_PARAMETERS = 0x013A,
TPM2_CC_NV_READ = 0x014E,
TPM2_CC_GET_CAPABILITY = 0x017A,
TPM2_CC_GET_RANDOM = 0x017B,
TPM2_CC_PCR_READ = 0x017E,
TPM2_CC_PCR_EXTEND = 0x0182,
TPM2_CC_PCR_SETAUTHVAL = 0x0183,
};
/**
* TPM2 return codes.
*/
enum tpm2_return_codes {
TPM2_RC_SUCCESS = 0x0000,
TPM2_RC_BAD_TAG = 0x001E,
TPM2_RC_FMT1 = 0x0080,
TPM2_RC_HASH = TPM2_RC_FMT1 + 0x0003,
TPM2_RC_VALUE = TPM2_RC_FMT1 + 0x0004,
TPM2_RC_SIZE = TPM2_RC_FMT1 + 0x0015,
TPM2_RC_BAD_AUTH = TPM2_RC_FMT1 + 0x0022,
TPM2_RC_HANDLE = TPM2_RC_FMT1 + 0x000B,
TPM2_RC_VER1 = 0x0100,
TPM2_RC_INITIALIZE = TPM2_RC_VER1 + 0x0000,
TPM2_RC_FAILURE = TPM2_RC_VER1 + 0x0001,
TPM2_RC_DISABLED = TPM2_RC_VER1 + 0x0020,
TPM2_RC_AUTH_MISSING = TPM2_RC_VER1 + 0x0025,
TPM2_RC_COMMAND_CODE = TPM2_RC_VER1 + 0x0043,
TPM2_RC_AUTHSIZE = TPM2_RC_VER1 + 0x0044,
TPM2_RC_AUTH_CONTEXT = TPM2_RC_VER1 + 0x0045,
TPM2_RC_NV_DEFINED = TPM2_RC_VER1 + 0x004c,
TPM2_RC_NEEDS_TEST = TPM2_RC_VER1 + 0x0053,
TPM2_RC_WARN = 0x0900,
TPM2_RC_TESTING = TPM2_RC_WARN + 0x000A,
TPM2_RC_REFERENCE_H0 = TPM2_RC_WARN + 0x0010,
TPM2_RC_LOCKOUT = TPM2_RC_WARN + 0x0021,
};
/**
* TPM2 algorithms.
*/
enum tpm2_algorithms {
TPM2_ALG_SHA1 = 0x04,
TPM2_ALG_XOR = 0x0A,
TPM2_ALG_SHA256 = 0x0B,
TPM2_ALG_SHA384 = 0x0C,
TPM2_ALG_SHA512 = 0x0D,
TPM2_ALG_NULL = 0x10,
TPM2_ALG_SM3_256 = 0x12,
};
/* NV index attributes */
enum tpm_index_attrs {
TPMA_NV_PPWRITE = 1UL << 0,
TPMA_NV_OWNERWRITE = 1UL << 1,
TPMA_NV_AUTHWRITE = 1UL << 2,
TPMA_NV_POLICYWRITE = 1UL << 3,
TPMA_NV_COUNTER = 1UL << 4,
TPMA_NV_BITS = 1UL << 5,
TPMA_NV_EXTEND = 1UL << 6,
TPMA_NV_POLICY_DELETE = 1UL << 10,
TPMA_NV_WRITELOCKED = 1UL << 11,
TPMA_NV_WRITEALL = 1UL << 12,
TPMA_NV_WRITEDEFINE = 1UL << 13,
TPMA_NV_WRITE_STCLEAR = 1UL << 14,
TPMA_NV_GLOBALLOCK = 1UL << 15,
TPMA_NV_PPREAD = 1UL << 16,
TPMA_NV_OWNERREAD = 1UL << 17,
TPMA_NV_AUTHREAD = 1UL << 18,
TPMA_NV_POLICYREAD = 1UL << 19,
TPMA_NV_NO_DA = 1UL << 25,
TPMA_NV_ORDERLY = 1UL << 26,
TPMA_NV_CLEAR_STCLEAR = 1UL << 27,
TPMA_NV_READLOCKED = 1UL << 28,
TPMA_NV_WRITTEN = 1UL << 29,
TPMA_NV_PLATFORMCREATE = 1UL << 30,
TPMA_NV_READ_STCLEAR = 1UL << 31,
TPMA_NV_MASK_READ = TPMA_NV_PPREAD | TPMA_NV_OWNERREAD |
TPMA_NV_AUTHREAD | TPMA_NV_POLICYREAD,
TPMA_NV_MASK_WRITE = TPMA_NV_PPWRITE | TPMA_NV_OWNERWRITE |
TPMA_NV_AUTHWRITE | TPMA_NV_POLICYWRITE,
};
enum {
TPM_ACCESS_VALID = 1 << 7,
TPM_ACCESS_ACTIVE_LOCALITY = 1 << 5,
TPM_ACCESS_REQUEST_PENDING = 1 << 2,
TPM_ACCESS_REQUEST_USE = 1 << 1,
TPM_ACCESS_ESTABLISHMENT = 1 << 0,
};
enum {
TPM_STS_FAMILY_SHIFT = 26,
TPM_STS_FAMILY_MASK = 0x3 << TPM_STS_FAMILY_SHIFT,
TPM_STS_FAMILY_TPM2 = 1 << TPM_STS_FAMILY_SHIFT,
TPM_STS_RESE_TESTABLISMENT_BIT = 1 << 25,
TPM_STS_COMMAND_CANCEL = 1 << 24,
TPM_STS_BURST_COUNT_SHIFT = 8,
TPM_STS_BURST_COUNT_MASK = 0xffff << TPM_STS_BURST_COUNT_SHIFT,
TPM_STS_VALID = 1 << 7,
TPM_STS_COMMAND_READY = 1 << 6,
TPM_STS_GO = 1 << 5,
TPM_STS_DATA_AVAIL = 1 << 4,
TPM_STS_DATA_EXPECT = 1 << 3,
TPM_STS_SELF_TEST_DONE = 1 << 2,
TPM_STS_RESPONSE_RETRY = 1 << 1,
TPM_STS_READ_ZERO = 0x23
};
enum {
TPM_CMD_COUNT_OFFSET = 2,
TPM_CMD_ORDINAL_OFFSET = 6,
TPM_MAX_BUF_SIZE = 1260,
};
enum {
/* Secure storage for firmware settings */
TPM_HT_PCR = 0,
TPM_HT_NV_INDEX,
TPM_HT_HMAC_SESSION,
TPM_HT_POLICY_SESSION,
HR_SHIFT = 24,
HR_PCR = TPM_HT_PCR << HR_SHIFT,
HR_HMAC_SESSION = TPM_HT_HMAC_SESSION << HR_SHIFT,
HR_POLICY_SESSION = TPM_HT_POLICY_SESSION << HR_SHIFT,
HR_NV_INDEX = TPM_HT_NV_INDEX << HR_SHIFT,
};
/**
* Issue a TPM2_Startup command.
*
* @dev TPM device
* @mode TPM startup mode
*
* Return: code of the operation
*/
u32 tpm2_startup(struct udevice *dev, enum tpm2_startup_types mode);
/**
* Issue a TPM2_SelfTest command.
*
* @dev TPM device
* @full_test Asking to perform all tests or only the untested ones
*
* Return: code of the operation
*/
u32 tpm2_self_test(struct udevice *dev, enum tpm2_yes_no full_test);
/**
* Issue a TPM2_Clear command.
*
* @dev TPM device
* @handle Handle
* @pw Password
* @pw_sz Length of the password
*
* Return: code of the operation
*/
u32 tpm2_clear(struct udevice *dev, u32 handle, const char *pw,
const ssize_t pw_sz);
/**
* Issue a TPM_NV_DefineSpace command
*
* This allows a space to be defined with given attributes and policy
*
* @dev TPM device
* @space_index index of the area
* @space_size size of area in bytes
* @nv_attributes TPM_NV_ATTRIBUTES of the area
* @nv_policy policy to use
* @nv_policy_size size of the policy
* Return: return code of the operation
*/
u32 tpm2_nv_define_space(struct udevice *dev, u32 space_index,
size_t space_size, u32 nv_attributes,
const u8 *nv_policy, size_t nv_policy_size);
/**
* Issue a TPM2_PCR_Extend command.
*
* @dev TPM device
* @index Index of the PCR
* @algorithm Algorithm used, defined in 'enum tpm2_algorithms'
* @digest Value representing the event to be recorded
* @digest_len len of the hash
*
* Return: code of the operation
*/
u32 tpm2_pcr_extend(struct udevice *dev, u32 index, u32 algorithm,
const u8 *digest, u32 digest_len);
/**
* Read data from the secure storage
*
* @dev TPM device
* @index Index of data to read
* @data Place to put data
* @count Number of bytes of data
* Return: code of the operation
*/
u32 tpm2_nv_read_value(struct udevice *dev, u32 index, void *data, u32 count);
/**
* Write data to the secure storage
*
* @dev TPM device
* @index Index of data to write
* @data Data to write
* @count Number of bytes of data
* Return: code of the operation
*/
u32 tpm2_nv_write_value(struct udevice *dev, u32 index, const void *data,
u32 count);
/**
* Issue a TPM2_PCR_Read command.
*
* @dev TPM device
* @idx Index of the PCR
* @idx_min_sz Minimum size in bytes of the pcrSelect array
* @algorithm Algorithm used, defined in 'enum tpm2_algorithms'
* @data Output buffer for contents of the named PCR
* @digest_len len of the data
* @updates Optional out parameter: number of updates for this PCR
*
* Return: code of the operation
*/
u32 tpm2_pcr_read(struct udevice *dev, u32 idx, unsigned int idx_min_sz,
u16 algorithm, void *data, u32 digest_len,
unsigned int *updates);
/**
* Issue a TPM2_GetCapability command. This implementation is limited
* to query property index that is 4-byte wide.
*
* @dev TPM device
* @capability Partition of capabilities
* @property Further definition of capability, limited to be 4 bytes wide
* @buf Output buffer for capability information
* @prop_count Size of output buffer
*
* Return: code of the operation
*/
u32 tpm2_get_capability(struct udevice *dev, u32 capability, u32 property,
void *buf, size_t prop_count);
/**
* Issue a TPM2_DictionaryAttackLockReset command.
*
* @dev TPM device
* @pw Password
* @pw_sz Length of the password
*
* Return: code of the operation
*/
u32 tpm2_dam_reset(struct udevice *dev, const char *pw, const ssize_t pw_sz);
/**
* Issue a TPM2_DictionaryAttackParameters command.
*
* @dev TPM device
* @pw Password
* @pw_sz Length of the password
* @max_tries Count of authorizations before lockout
* @recovery_time Time before decrementation of the failure count
* @lockout_recovery Time to wait after a lockout
*
* Return: code of the operation
*/
u32 tpm2_dam_parameters(struct udevice *dev, const char *pw,
const ssize_t pw_sz, unsigned int max_tries,
unsigned int recovery_time,
unsigned int lockout_recovery);
/**
* Issue a TPM2_HierarchyChangeAuth command.
*
* @dev TPM device
* @handle Handle
* @newpw New password
* @newpw_sz Length of the new password
* @oldpw Old password
* @oldpw_sz Length of the old password
*
* Return: code of the operation
*/
int tpm2_change_auth(struct udevice *dev, u32 handle, const char *newpw,
const ssize_t newpw_sz, const char *oldpw,
const ssize_t oldpw_sz);
/**
* Issue a TPM_PCR_SetAuthPolicy command.
*
* @dev TPM device
* @pw Platform password
* @pw_sz Length of the password
* @index Index of the PCR
* @digest New key to access the PCR
*
* Return: code of the operation
*/
u32 tpm2_pcr_setauthpolicy(struct udevice *dev, const char *pw,
const ssize_t pw_sz, u32 index, const char *key);
/**
* Issue a TPM_PCR_SetAuthValue command.
*
* @dev TPM device
* @pw Platform password
* @pw_sz Length of the password
* @index Index of the PCR
* @digest New key to access the PCR
* @key_sz Length of the new key
*
* Return: code of the operation
*/
u32 tpm2_pcr_setauthvalue(struct udevice *dev, const char *pw,
const ssize_t pw_sz, u32 index, const char *key,
const ssize_t key_sz);
/**
* Issue a TPM2_GetRandom command.
*
* @dev TPM device
* @param data output buffer for the random bytes
* @param count size of output buffer
*
* Return: return code of the operation
*/
u32 tpm2_get_random(struct udevice *dev, void *data, u32 count);
/**
* Lock data in the TPM
*
* Once locked the data cannot be written until after a reboot
*
* @dev TPM device
* @index Index of data to lock
* Return: code of the operation
*/
u32 tpm2_write_lock(struct udevice *dev, u32 index);
/**
* Disable access to any platform data
*
* This can be called to close off access to the firmware data in the data,
* before calling the kernel.
*
* @dev TPM device
* Return: code of the operation
*/
u32 tpm2_disable_platform_hierarchy(struct udevice *dev);
/**
* submit user specified data to the TPM and get response
*
* @dev TPM device
* @sendbuf: Buffer of the data to send
* @recvbuf: Buffer to save the response to
* @recv_size: Pointer to the size of the response buffer
*
* Return: code of the operation
*/
u32 tpm2_submit_command(struct udevice *dev, const u8 *sendbuf,
u8 *recvbuf, size_t *recv_size);
#endif /* __TPM_V2_H */
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