[J-u-boot.git] / lib / tpm-utils.h

/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Copyright (c) 2013 The Chromium OS Authors.
 * Coypright (c) 2013 Guntermann & Drunck GmbH
 */

#ifndef __TPM_UTILS_H
#define __TPM_UTILS_H

#define COMMAND_BUFFER_SIZE 256

/* Internal error of TPM command library */
#define TPM_LIB_ERROR ((u32)~0u)

/* To make strings of commands more easily */
#define __MSB(x) ((x) >> 8)
#define __LSB(x) ((x) & 0xFF)
#define tpm_u16(x) __MSB(x), __LSB(x)
#define tpm_u32(x) tpm_u16((x) >> 16), tpm_u16((x) & 0xFFFF)

/**
 * Pack data into a byte string.  The data types are specified in
 * the format string: 'b' means unsigned byte, 'w' unsigned word,
 * 'd' unsigned double word, and 's' byte string.  The data are a
 * series of offsets and values (for type byte string there are also
 * lengths).  The data values are packed into the byte string
 * sequentially, and so a latter value could over-write a former
 * value.
 *
 * @param str		output string
 * @param size		size of output string
 * @param format	format string
 * @param ...		data points
 * @return 0 on success, non-0 on error
 */
int pack_byte_string(u8 *str, size_t size, const char *format, ...);

/**
 * Unpack data from a byte string.  The data types are specified in
 * the format string: 'b' means unsigned byte, 'w' unsigned word,
 * 'd' unsigned double word, and 's' byte string.  The data are a
 * series of offsets and pointers (for type byte string there are also
 * lengths).
 *
 * @param str		output string
 * @param size		size of output string
 * @param format	format string
 * @param ...		data points
 * @return 0 on success, non-0 on error
 */
int unpack_byte_string(const u8 *str, size_t size, const char *format, ...);

/**
 * Get TPM command size.
 *
 * @param command	byte string of TPM command
 * @return command size of the TPM command
 */
u32 tpm_command_size(const void *command);

/**
 * Get TPM response return code, which is one of TPM_RESULT values.
 *
 * @param response	byte string of TPM response
 * @return return code of the TPM response
 */
u32 tpm_return_code(const void *response);

/**
 * Send a TPM command and return response's return code, and optionally
 * return response to caller.
 *
 * @param command	byte string of TPM command
 * @param response	output buffer for TPM response, or NULL if the
 *			caller does not care about it
 * @param size_ptr	output buffer size (input parameter) and TPM
 *			response length (output parameter); this parameter
 *			is a bidirectional
 * @return return code of the TPM response
 */
u32 tpm_sendrecv_command(struct udevice *dev, const void *command,
			 void *response, size_t *size_ptr);

#endif /* __TPM_UTILS_H */
Commit	Line	Data
d677bfe2 MR	1	/* SPDX-License-Identifier: GPL-2.0+ */
	2	/*
	3	* Copyright (c) 2013 The Chromium OS Authors.
	4	* Coypright (c) 2013 Guntermann & Drunck GmbH
	5	*/
	6
	7	#ifndef __TPM_UTILS_H
	8	#define __TPM_UTILS_H
	9
	10	#define COMMAND_BUFFER_SIZE 256
	11
	12	/* Internal error of TPM command library */
	13	#define TPM_LIB_ERROR ((u32)~0u)
	14
f6872816 MR	15	/* To make strings of commands more easily */
	16	#define __MSB(x) ((x) >> 8)
	17	#define __LSB(x) ((x) & 0xFF)
	18	#define tpm_u16(x) __MSB(x), __LSB(x)
	19	#define tpm_u32(x) tpm_u16((x) >> 16), tpm_u16((x) & 0xFFFF)
	20
d677bfe2 MR	21	/**
	22	* Pack data into a byte string. The data types are specified in
	23	* the format string: 'b' means unsigned byte, 'w' unsigned word,
	24	* 'd' unsigned double word, and 's' byte string. The data are a
	25	* series of offsets and values (for type byte string there are also
	26	* lengths). The data values are packed into the byte string
	27	* sequentially, and so a latter value could over-write a former
	28	* value.
	29	*
	30	* @param str output string
	31	* @param size size of output string
	32	* @param format format string
	33	* @param ... data points
	34	* @return 0 on success, non-0 on error
	35	*/
	36	int pack_byte_string(u8 str, size_t size, const char format, ...);
	37
	38	/**
	39	* Unpack data from a byte string. The data types are specified in
	40	* the format string: 'b' means unsigned byte, 'w' unsigned word,
	41	* 'd' unsigned double word, and 's' byte string. The data are a
	42	* series of offsets and pointers (for type byte string there are also
	43	* lengths).
	44	*
	45	* @param str output string
	46	* @param size size of output string
	47	* @param format format string
	48	* @param ... data points
	49	* @return 0 on success, non-0 on error
	50	*/
	51	int unpack_byte_string(const u8 str, size_t size, const char format, ...);
	52
	53	/**
	54	* Get TPM command size.
	55	*
	56	* @param command byte string of TPM command
	57	* @return command size of the TPM command
	58	*/
	59	u32 tpm_command_size(const void *command);
	60
	61	/**
	62	* Get TPM response return code, which is one of TPM_RESULT values.
	63	*
	64	* @param response byte string of TPM response
	65	* @return return code of the TPM response
	66	*/
	67	u32 tpm_return_code(const void *response);
	68
	69	/**
	70	* Send a TPM command and return response's return code, and optionally
	71	* return response to caller.
	72	*
	73	* @param command byte string of TPM command
	74	* @param response output buffer for TPM response, or NULL if the
	75	* caller does not care about it
	76	* @param size_ptr output buffer size (input parameter) and TPM
	77	* response length (output parameter); this parameter
	78	* is a bidirectional
	79	* @return return code of the TPM response
	80	*/
abdc7b8a SG	81	u32 tpm_sendrecv_command(struct udevice dev, const void command,
abdc7b8a SG	82	void response, size_t size_ptr);
d677bfe2 MR	83
d677bfe2 MR	84	#endif /* __TPM_UTILS_H */