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101 lines
3.0 KiB
101 lines
3.0 KiB
/* SPDX-License-Identifier: GPL-2.0+ */ |
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/* |
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* Copyright (c) 2013 The Chromium OS Authors. |
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* Coypright (c) 2013 Guntermann & Drunck GmbH |
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*/ |
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#ifndef __TPM_UTILS_H |
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#define __TPM_UTILS_H |
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#define COMMAND_BUFFER_SIZE 256 |
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/* Internal error of TPM command library */ |
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#define TPM_LIB_ERROR ((u32)~0u) |
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/* To make strings of commands more easily */ |
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#define __MSB(x) ((x) >> 8) |
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#define __LSB(x) ((x) & 0xFF) |
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#define tpm_u16(x) __MSB(x), __LSB(x) |
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#define tpm_u32(x) tpm_u16((x) >> 16), tpm_u16((x) & 0xFFFF) |
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/** |
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* tpm_open() - Request access to locality 0 for the caller |
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* |
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* After all commands have been completed the caller is supposed to |
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* call tpm_close(). |
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* |
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* Returns 0 on success, -ve on failure. |
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*/ |
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int tpm_open(struct udevice *dev); |
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/** |
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* tpm_close() - Close the current session |
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* |
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* Releasing the locked locality. Returns 0 on success, -ve 1 on |
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* failure (in case lock removal did not succeed). |
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*/ |
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int tpm_close(struct udevice *dev); |
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/** |
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* Pack data into a byte string. The data types are specified in |
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* the format string: 'b' means unsigned byte, 'w' unsigned word, |
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* 'd' unsigned double word, and 's' byte string. The data are a |
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* series of offsets and values (for type byte string there are also |
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* lengths). The data values are packed into the byte string |
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* sequentially, and so a latter value could over-write a former |
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* value. |
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* |
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* @param str output string |
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* @param size size of output string |
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* @param format format string |
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* @param ... data points |
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* @return 0 on success, non-0 on error |
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*/ |
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int pack_byte_string(u8 *str, size_t size, const char *format, ...); |
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/** |
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* Unpack data from a byte string. The data types are specified in |
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* the format string: 'b' means unsigned byte, 'w' unsigned word, |
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* 'd' unsigned double word, and 's' byte string. The data are a |
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* series of offsets and pointers (for type byte string there are also |
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* lengths). |
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* |
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* @param str output string |
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* @param size size of output string |
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* @param format format string |
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* @param ... data points |
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* @return 0 on success, non-0 on error |
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*/ |
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int unpack_byte_string(const u8 *str, size_t size, const char *format, ...); |
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/** |
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* Get TPM command size. |
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* |
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* @param command byte string of TPM command |
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* @return command size of the TPM command |
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*/ |
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u32 tpm_command_size(const void *command); |
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/** |
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* Get TPM response return code, which is one of TPM_RESULT values. |
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* |
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* @param response byte string of TPM response |
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* @return return code of the TPM response |
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*/ |
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u32 tpm_return_code(const void *response); |
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/** |
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* Send a TPM command and return response's return code, and optionally |
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* return response to caller. |
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* |
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* @param command byte string of TPM command |
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* @param response output buffer for TPM response, or NULL if the |
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* caller does not care about it |
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* @param size_ptr output buffer size (input parameter) and TPM |
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* response length (output parameter); this parameter |
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* is a bidirectional |
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* @return return code of the TPM response |
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*/ |
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u32 tpm_sendrecv_command(const void *command, void *response, size_t *size_ptr); |
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#endif /* __TPM_UTILS_H */
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