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https://github.com/ARM-software/arm-trusted-firmware.git
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b695b2f16e
Adding a static helper function plat_get_nv_ctr_addr() to be used by both plat_set_nv_ctr() and plat_get_nv_ctr() to return the non-volatile counter address stored in the platform. Change-Id: I5124c19e4537bb369724aa0160cc55a3cb1ab7eb Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
116 lines
2.8 KiB
C
116 lines
2.8 KiB
C
/*
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* Copyright (c) 2016-2023, Arm Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <assert.h>
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#include <stdint.h>
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#include <string.h>
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#include <lib/mmio.h>
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#include <lib/fconf/fconf.h>
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#include <plat/arm/common/plat_arm.h>
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#include <plat/arm/common/fconf_nv_cntr_getter.h>
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#include <plat/common/platform.h>
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#include <platform_def.h>
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#include <tools_share/cca_oid.h>
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/*
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* Return the ROTPK hash in the following ASN.1 structure in DER format:
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*
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* AlgorithmIdentifier ::= SEQUENCE {
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* algorithm OBJECT IDENTIFIER,
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* parameters ANY DEFINED BY algorithm OPTIONAL
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* }
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*
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* DigestInfo ::= SEQUENCE {
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* digestAlgorithm AlgorithmIdentifier,
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* digest OCTET STRING
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* }
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*/
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int plat_get_rotpk_info(void *cookie, void **key_ptr, unsigned int *key_len,
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unsigned int *flags)
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{
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return arm_get_rotpk_info(cookie, key_ptr, key_len, flags);
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}
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/*
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* Return the non-volatile counter address stored in the platform. The cookie
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* will contain the OID of the counter in the certificate.
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*
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* Return: 0 = success, Otherwise = error
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*/
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static int plat_get_nv_ctr_addr(void *cookie, uintptr_t *nv_ctr_addr)
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{
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const char *oid = (const char *)cookie;
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if (strcmp(oid, TRUSTED_FW_NVCOUNTER_OID) == 0) {
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*nv_ctr_addr = FCONF_GET_PROPERTY(cot, nv_cntr_addr,
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TRUSTED_NV_CTR_ID);
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} else if (strcmp(oid, NON_TRUSTED_FW_NVCOUNTER_OID) == 0) {
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*nv_ctr_addr = FCONF_GET_PROPERTY(cot, nv_cntr_addr,
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NON_TRUSTED_NV_CTR_ID);
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} else if (strcmp(oid, CCA_FW_NVCOUNTER_OID) == 0) {
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/* FVP does not support the CCA NV Counter so use the Trusted NV */
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*nv_ctr_addr = FCONF_GET_PROPERTY(cot, nv_cntr_addr,
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TRUSTED_NV_CTR_ID);
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} else {
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return 1;
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}
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return 0;
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}
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/*
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* Store a new non-volatile counter value.
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*
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* On some FVP versions, the non-volatile counters are read-only so this
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* function will always fail.
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*
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* Return: 0 = success, Otherwise = error
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*/
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int plat_set_nv_ctr(void *cookie, unsigned int nv_ctr)
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{
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uintptr_t nv_ctr_addr;
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int rc;
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assert(cookie != NULL);
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rc = plat_get_nv_ctr_addr(cookie, &nv_ctr_addr);
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if (rc != 0) {
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return rc;
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}
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mmio_write_32(nv_ctr_addr, nv_ctr);
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/*
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* If the FVP models a locked counter then its value cannot be updated
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* and the above write operation has been silently ignored.
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*/
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return (mmio_read_32(nv_ctr_addr) == nv_ctr) ? 0 : 1;
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}
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/*
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* Return the non-volatile counter value stored in the platform. The cookie
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* will contain the OID of the counter in the certificate.
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*
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* Return: 0 = success, Otherwise = error
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*/
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int plat_get_nv_ctr(void *cookie, unsigned int *nv_ctr)
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{
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uintptr_t nv_ctr_addr;
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int rc;
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assert(cookie != NULL);
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assert(nv_ctr != NULL);
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rc = plat_get_nv_ctr_addr(cookie, &nv_ctr_addr);
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if (rc != 0) {
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return rc;
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}
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*nv_ctr = *((unsigned int *)nv_ctr_addr);
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return 0;
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}
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