1 /*
2 * Copyright (c) 2021, ARM Limited and Contributors. All rights reserved.
3 *
4 * SPDX-License-Identifier: BSD-3-Clause
5 */
6
7 #include <assert.h>
8 #include <stdint.h>
9 #include <string.h>
10
11 #include <lib/fconf/fconf.h>
12 #include <lib/mmio.h>
13 #include <tools_share/tbbr_oid.h>
14
15 #include <plat/arm/common/fconf_nv_cntr_getter.h>
16 #include <plat/arm/common/plat_arm.h>
17 #include <plat/common/platform.h>
18 #include <platform_def.h>
19
20
21 /*
22 * Return the ROTPK hash in the following ASN.1 structure in DER format:
23 *
24 * AlgorithmIdentifier ::= SEQUENCE {
25 * algorithm OBJECT IDENTIFIER,
26 * parameters ANY DEFINED BY algorithm OPTIONAL
27 * }
28 *
29 * DigestInfo ::= SEQUENCE {
30 * digestAlgorithm AlgorithmIdentifier,
31 * digest OCTET STRING
32 * }
33 */
plat_get_rotpk_info(void * cookie,void ** key_ptr,unsigned int * key_len,unsigned int * flags)34 int plat_get_rotpk_info(void *cookie, void **key_ptr, unsigned int *key_len,
35 unsigned int *flags)
36 {
37 return arm_get_rotpk_info(cookie, key_ptr, key_len, flags);
38 }
39
40 /*
41 * Store a new non-volatile counter value.
42 *
43 * On some FVP_R versions, the non-volatile counters are read-only so this
44 * function will always fail.
45 *
46 * Return: 0 = success, Otherwise = error
47 */
plat_set_nv_ctr(void * cookie,unsigned int nv_ctr)48 int plat_set_nv_ctr(void *cookie, unsigned int nv_ctr)
49 {
50 const char *oid;
51 uintptr_t nv_ctr_addr;
52
53 assert(cookie != NULL);
54
55 oid = (const char *)cookie;
56 if (strcmp(oid, TRUSTED_FW_NVCOUNTER_OID) == 0) {
57 nv_ctr_addr = FCONF_GET_PROPERTY(cot, nv_cntr_addr,
58 TRUSTED_NV_CTR_ID);
59 } else if (strcmp(oid, NON_TRUSTED_FW_NVCOUNTER_OID) == 0) {
60 nv_ctr_addr = FCONF_GET_PROPERTY(cot, nv_cntr_addr,
61 NON_TRUSTED_NV_CTR_ID);
62 } else {
63 return 1;
64 }
65
66 mmio_write_32(nv_ctr_addr, nv_ctr);
67
68 /*
69 * If the FVP_R models a locked counter then its value cannot be updated
70 * and the above write operation has been silently ignored.
71 */
72 return (mmio_read_32(nv_ctr_addr) == nv_ctr) ? 0 : 1;
73 }
74