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1 /*
2  * Copyright (c) 2013 Google, Inc
3  *
4  * SPDX-License-Identifier:     GPL-2.0+
5  */
6
7 #include <common.h>
8 #include <dm.h>
9 #include <tpm.h>
10 #include <asm/state.h>
11 #include <asm/unaligned.h>
12 #include <linux/crc8.h>
13
14 /* TPM NVRAM location indices. */
15 #define FIRMWARE_NV_INDEX               0x1007
16 #define KERNEL_NV_INDEX                 0x1008
17
18 #define NV_DATA_PUBLIC_PERMISSIONS_OFFSET       60
19
20 /* Kernel TPM space - KERNEL_NV_INDEX, locked with physical presence */
21 #define ROLLBACK_SPACE_KERNEL_VERSION   2
22 #define ROLLBACK_SPACE_KERNEL_UID       0x4752574C  /* 'GRWL' */
23
24 struct rollback_space_kernel {
25         /* Struct version, for backwards compatibility */
26         uint8_t struct_version;
27         /* Unique ID to detect space redefinition */
28         uint32_t uid;
29         /* Kernel versions */
30         uint32_t kernel_versions;
31         /* Reserved for future expansion */
32         uint8_t reserved[3];
33         /* Checksum (v2 and later only) */
34         uint8_t crc8;
35 } __packed rollback_space_kernel;
36
37 /*
38  * These numbers derive from adding the sizes of command fields as shown in
39  * the TPM commands manual.
40  */
41 #define TPM_REQUEST_HEADER_LENGTH       10
42 #define TPM_RESPONSE_HEADER_LENGTH      10
43
44 /* These are the different non-volatile spaces that we emulate */
45 enum {
46         NV_GLOBAL_LOCK,
47         NV_SEQ_FIRMWARE,
48         NV_SEQ_KERNEL,
49         NV_SEQ_COUNT,
50 };
51
52 /* Size of each non-volatile space */
53 #define NV_DATA_SIZE            0x20
54
55 /*
56  * Information about our TPM emulation. This is preserved in the sandbox
57  * state file if enabled.
58  */
59 static struct tpm_state {
60         uint8_t nvdata[NV_SEQ_COUNT][NV_DATA_SIZE];
61 } g_state;
62
63 /**
64  * sandbox_tpm_read_state() - read the sandbox EC state from the state file
65  *
66  * If data is available, then blob and node will provide access to it. If
67  * not this function sets up an empty TPM.
68  *
69  * @blob: Pointer to device tree blob, or NULL if no data to read
70  * @node: Node offset to read from
71  */
72 static int sandbox_tpm_read_state(const void *blob, int node)
73 {
74         const char *prop;
75         int len;
76         int i;
77
78         if (!blob)
79                 return 0;
80
81         for (i = 0; i < NV_SEQ_COUNT; i++) {
82                 char prop_name[20];
83
84                 sprintf(prop_name, "nvdata%d", i);
85                 prop = fdt_getprop(blob, node, prop_name, &len);
86                 if (prop && len == NV_DATA_SIZE)
87                         memcpy(g_state.nvdata[i], prop, NV_DATA_SIZE);
88         }
89
90         return 0;
91 }
92
93 /**
94  * cros_ec_write_state() - Write out our state to the state file
95  *
96  * The caller will ensure that there is a node ready for the state. The node
97  * may already contain the old state, in which case it is overridden.
98  *
99  * @blob: Device tree blob holding state
100  * @node: Node to write our state into
101  */
102 static int sandbox_tpm_write_state(void *blob, int node)
103 {
104         int i;
105
106         /*
107          * We are guaranteed enough space to write basic properties.
108          * We could use fdt_add_subnode() to put each set of data in its
109          * own node - perhaps useful if we add access informaiton to each.
110          */
111         for (i = 0; i < NV_SEQ_COUNT; i++) {
112                 char prop_name[20];
113
114                 sprintf(prop_name, "nvdata%d", i);
115                 fdt_setprop(blob, node, prop_name, g_state.nvdata[i],
116                             NV_DATA_SIZE);
117         }
118
119         return 0;
120 }
121
122 SANDBOX_STATE_IO(sandbox_tpm, "google,sandbox-tpm", sandbox_tpm_read_state,
123                  sandbox_tpm_write_state);
124
125 static int index_to_seq(uint32_t index)
126 {
127         switch (index) {
128         case FIRMWARE_NV_INDEX:
129                 return NV_SEQ_FIRMWARE;
130         case KERNEL_NV_INDEX:
131                 return NV_SEQ_KERNEL;
132         case 0:
133                 return NV_GLOBAL_LOCK;
134         }
135
136         printf("Invalid nv index %#x\n", index);
137         return -1;
138 }
139
140 static int sandbox_tpm_xfer(struct udevice *dev, const uint8_t *sendbuf,
141                             size_t send_size, uint8_t *recvbuf,
142                             size_t *recv_len)
143 {
144         struct tpm_state *tpm = dev_get_priv(dev);
145         uint32_t code, index, length, type;
146         uint8_t *data;
147         int seq;
148
149         code = get_unaligned_be32(sendbuf + sizeof(uint16_t) +
150                                   sizeof(uint32_t));
151         printf("tpm: %zd bytes, recv_len %zd, cmd = %x\n", send_size,
152                *recv_len, code);
153         print_buffer(0, sendbuf, 1, send_size, 0);
154         switch (code) {
155         case 0x65: /* get flags */
156                 type = get_unaligned_be32(sendbuf + 14);
157                 switch (type) {
158                 case 4:
159                         index = get_unaligned_be32(sendbuf + 18);
160                         printf("Get flags index %#02x\n", index);
161                         *recv_len = 22;
162                         memset(recvbuf, '\0', *recv_len);
163                         put_unaligned_be32(22, recvbuf +
164                                            TPM_RESPONSE_HEADER_LENGTH);
165                         data = recvbuf + TPM_RESPONSE_HEADER_LENGTH +
166                                         sizeof(uint32_t);
167                         switch (index) {
168                         case FIRMWARE_NV_INDEX:
169                                 break;
170                         case KERNEL_NV_INDEX:
171                                 /* TPM_NV_PER_PPWRITE */
172                                 put_unaligned_be32(1, data +
173                                         NV_DATA_PUBLIC_PERMISSIONS_OFFSET);
174                                 break;
175                         }
176                         break;
177                 case 0x11: /* TPM_CAP_NV_INDEX */
178                         index = get_unaligned_be32(sendbuf + 18);
179                         printf("Get cap nv index %#02x\n", index);
180                         put_unaligned_be32(22, recvbuf +
181                                            TPM_RESPONSE_HEADER_LENGTH);
182                         break;
183                 default:
184                         printf("   ** Unknown 0x65 command type %#02x\n",
185                                type);
186                         return -1;
187                 }
188                 break;
189         case 0xcd: /* nvwrite */
190                 index = get_unaligned_be32(sendbuf + 10);
191                 length = get_unaligned_be32(sendbuf + 18);
192                 seq = index_to_seq(index);
193                 if (seq < 0)
194                         return -1;
195                 printf("tpm: nvwrite index=%#02x, len=%#02x\n", index, length);
196                 memcpy(&tpm->nvdata[seq], sendbuf + 22, length);
197                 *recv_len = 12;
198                 memset(recvbuf, '\0', *recv_len);
199                 break;
200         case 0xcf: /* nvread */
201                 index = get_unaligned_be32(sendbuf + 10);
202                 length = get_unaligned_be32(sendbuf + 18);
203                 seq = index_to_seq(index);
204                 if (seq < 0)
205                         return -1;
206                 printf("tpm: nvread index=%#02x, len=%#02x\n", index, length);
207                 *recv_len = TPM_RESPONSE_HEADER_LENGTH + sizeof(uint32_t) +
208                                         length;
209                 memset(recvbuf, '\0', *recv_len);
210                 put_unaligned_be32(length, recvbuf +
211                                    TPM_RESPONSE_HEADER_LENGTH);
212                 if (seq == NV_SEQ_KERNEL) {
213                         struct rollback_space_kernel rsk;
214
215                         data = recvbuf + TPM_RESPONSE_HEADER_LENGTH +
216                                         sizeof(uint32_t);
217                         memset(&rsk, 0, sizeof(struct rollback_space_kernel));
218                         rsk.struct_version = 2;
219                         rsk.uid = ROLLBACK_SPACE_KERNEL_UID;
220                         rsk.crc8 = crc8(0, (unsigned char *)&rsk,
221                                         offsetof(struct rollback_space_kernel,
222                                                  crc8));
223                         memcpy(data, &rsk, sizeof(rsk));
224                 } else {
225                         memcpy(recvbuf + TPM_RESPONSE_HEADER_LENGTH +
226                                sizeof(uint32_t), &tpm->nvdata[seq], length);
227                 }
228                 break;
229         case 0x14: /* tpm extend */
230         case 0x15: /* pcr read */
231         case 0x5d: /* force clear */
232         case 0x6f: /* physical enable */
233         case 0x72: /* physical set deactivated */
234         case 0x99: /* startup */
235         case 0x4000000a:  /* assert physical presence */
236                 *recv_len = 12;
237                 memset(recvbuf, '\0', *recv_len);
238                 break;
239         default:
240                 printf("Unknown tpm command %02x\n", code);
241                 return -1;
242         }
243
244         return 0;
245 }
246
247 static int sandbox_tpm_get_desc(struct udevice *dev, char *buf, int size)
248 {
249         if (size < 15)
250                 return -ENOSPC;
251
252         return snprintf(buf, size, "sandbox TPM");
253 }
254
255 static int sandbox_tpm_probe(struct udevice *dev)
256 {
257         struct tpm_state *tpm = dev_get_priv(dev);
258
259         memcpy(tpm, &g_state, sizeof(*tpm));
260
261         return 0;
262 }
263
264 static int sandbox_tpm_open(struct udevice *dev)
265 {
266         return 0;
267 }
268
269 static int sandbox_tpm_close(struct udevice *dev)
270 {
271         return 0;
272 }
273
274 static const struct tpm_ops sandbox_tpm_ops = {
275         .open           = sandbox_tpm_open,
276         .close          = sandbox_tpm_close,
277         .get_desc       = sandbox_tpm_get_desc,
278         .xfer           = sandbox_tpm_xfer,
279 };
280
281 static const struct udevice_id sandbox_tpm_ids[] = {
282         { .compatible = "google,sandbox-tpm" },
283         { }
284 };
285
286 U_BOOT_DRIVER(sandbox_tpm) = {
287         .name   = "sandbox_tpm",
288         .id     = UCLASS_TPM,
289         .of_match = sandbox_tpm_ids,
290         .ops    = &sandbox_tpm_ops,
291         .probe  = sandbox_tpm_probe,
292         .priv_auto_alloc_size = sizeof(struct tpm_state),
293 };