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