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Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
109 lines
2.9 KiB
C
109 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Common features for sandbox TPM1 and TPM2 implementations
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*
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* Copyright 2021 Google LLC
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*/
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#ifndef __TPM_SANDBOX_COMMON_H
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#define __TPM_SANDBOX_COMMON_H
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/*
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* These numbers derive from adding the sizes of command fields as shown in
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* the TPM commands manual.
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*/
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#define TPM_HDR_LEN 10
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/* These are the different non-volatile spaces that we emulate */
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enum sandbox_nv_space {
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NV_SEQ_ENABLE_LOCKING,
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NV_SEQ_GLOBAL_LOCK,
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NV_SEQ_FIRMWARE,
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NV_SEQ_KERNEL,
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NV_SEQ_BACKUP,
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NV_SEQ_FWMP,
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NV_SEQ_REC_HASH,
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NV_SEQ_COUNT,
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};
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/* TPM NVRAM location indices */
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#define FIRMWARE_NV_INDEX 0x1007
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#define KERNEL_NV_INDEX 0x1008
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#define BACKUP_NV_INDEX 0x1009
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#define FWMP_NV_INDEX 0x100a
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#define MRC_REC_HASH_NV_INDEX 0x100b
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/* Size of each non-volatile space */
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#define NV_DATA_SIZE 0x28
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/**
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* struct nvdata_state - state of a single non-volatile-data 'space'
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*
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* @present: true if present
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* @length: length in bytes (max NV_DATA_SIZE)
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* @data: contents of non-volatile space
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*/
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struct nvdata_state {
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bool present;
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int length;
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u8 data[NV_DATA_SIZE];
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};
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/**
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* sb_tpm_index_to_seq() - convert an index into a space sequence number
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*
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* This converts the index as used by the vboot code into an internal sequence
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* number used by the sandbox emulation.
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*
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* @index: Index to use (FIRMWARE_NV_INDEX, etc.)
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* Return: associated space (enum sandbox_nv_space)
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*/
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int sb_tpm_index_to_seq(uint index);
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/**
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* sb_tpm_read_data() - Read non-volatile data
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*
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* This handles a TPM read of nvdata. If the nvdata is not present, a
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* TPM_BADINDEX error is put in the buffer. If @length is too large,
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* TPM_BAD_DATASIZE is put in the buffer.
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*
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* @nvdata: Current nvdata state
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* @seq: Sequence number to read
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* @recvbuf: Buffer to update with the TPM response, assumed to contain zeroes
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* @data_ofs: Offset of the 'data' portion of @recvbuf
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* @length: Number of bytes to read
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*/
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void sb_tpm_read_data(const struct nvdata_state nvdata[NV_SEQ_COUNT],
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enum sandbox_nv_space seq, u8 *recvbuf, int data_ofs,
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int length);
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/**
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* sb_tpm_write_data() - Write non-volatile data
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*
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* If @length is too large, an error is logged and nothing is written.
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*
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* @nvdata: Current nvdata state
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* @seq: Sequence number to read
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* @buf: Buffer containing the data to write
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* @data_ofs: Offset of the 'data' portion of @buf
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* @length: Number of bytes to write
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*/
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void sb_tpm_write_data(struct nvdata_state nvdata[NV_SEQ_COUNT],
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enum sandbox_nv_space seq, const u8 *buf, int data_ofs,
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int length);
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/**
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* sb_tpm_define_data() - Set up non-volatile data
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*
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* If @length is too large, an error is logged and nothing is written.
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*
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* @nvdata: Current nvdata state
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* @seq: Sequence number to set up
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* @length: Length of space in bytes
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*/
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void sb_tpm_define_data(struct nvdata_state nvdata[NV_SEQ_COUNT],
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enum sandbox_nv_space seq, int length);
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#endif
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