109 lines
2.9 KiB
C
109 lines
2.9 KiB
C
/* 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
|