1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Common features for sandbox TPM1 and TPM2 implementations
4 *
5 * Copyright 2021 Google LLC
6 */
7
8#define LOG_CATEGORY	UCLASS_TPM
9
10#include <common.h>
11#include <tpm-v1.h>
12#include <tpm-v2.h>
13#include <asm/unaligned.h>
14#include "sandbox_common.h"
15
16#define TPM_ERR_CODE_OFS	(2 + 4)		/* after tag and size */
17
18int sb_tpm_index_to_seq(u32 index)
19{
20	index &= ~HR_NV_INDEX;
21	switch (index) {
22	case FIRMWARE_NV_INDEX:
23		return NV_SEQ_FIRMWARE;
24	case KERNEL_NV_INDEX:
25		return NV_SEQ_KERNEL;
26	case BACKUP_NV_INDEX:
27		return NV_SEQ_BACKUP;
28	case FWMP_NV_INDEX:
29		return NV_SEQ_FWMP;
30	case MRC_REC_HASH_NV_INDEX:
31		return NV_SEQ_REC_HASH;
32	case 0:
33		return NV_SEQ_GLOBAL_LOCK;
34	case TPM_NV_INDEX_LOCK:
35		return NV_SEQ_ENABLE_LOCKING;
36	}
37
38	printf("Invalid nv index %#x\n", index);
39	return -1;
40}
41
42void sb_tpm_read_data(const struct nvdata_state nvdata[NV_SEQ_COUNT],
43		      enum sandbox_nv_space seq, u8 *buf, int data_ofs,
44		      int length)
45{
46	const struct nvdata_state *nvd = &nvdata[seq];
47
48	if (!nvd->present)
49		put_unaligned_be32(TPM_BADINDEX, buf + TPM_ERR_CODE_OFS);
50	else if (length > nvd->length)
51		put_unaligned_be32(TPM_BAD_DATASIZE, buf + TPM_ERR_CODE_OFS);
52	else
53		memcpy(buf + data_ofs, &nvd->data, length);
54}
55
56void sb_tpm_write_data(struct nvdata_state nvdata[NV_SEQ_COUNT],
57		       enum sandbox_nv_space seq, const u8 *buf, int data_ofs,
58		       int length)
59{
60	struct nvdata_state *nvd = &nvdata[seq];
61
62	if (length > nvd->length)
63		log_err("Invalid length %x (max %x)\n", length, nvd->length);
64	else
65		memcpy(&nvdata[seq].data, buf + data_ofs, length);
66}
67
68void sb_tpm_define_data(struct nvdata_state nvdata[NV_SEQ_COUNT],
69			enum sandbox_nv_space seq, int length)
70{
71	struct nvdata_state *nvd = &nvdata[seq];
72
73	if (length > NV_DATA_SIZE)
74		log_err("Invalid length %x (max %x)\n", length, NV_DATA_SIZE);
75	nvd->length = length;
76	nvd->present = true;
77}
78