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TPM commands are much easier to read/write with these macros that will transform words or integers into byte strings. This way, there is no need to call pack_byte_string() while all variable length in a command are known (and at must 4 bytes, which is a lot of them). Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Tom Rini <trini@konsulko.com>
101 lines
3 KiB
C
101 lines
3 KiB
C
/* 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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