109 lines
3 KiB
C
109 lines
3 KiB
C
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/* Copyright 2013-2016 IBM Corp.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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* implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __TPM_H
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#define __TPM_H
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#include <device.h>
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#include "tss/tpmLogMgr.H"
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#include "tss/trustedTypes.H"
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struct tpm_dev {
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/* TPM bus id */
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int bus_id;
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/* TPM address in the bus */
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int i2c_addr;
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};
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struct tpm_driver {
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/* Driver name */
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const char* name;
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/* Transmit the TPM command stored in buf to the tpm device */
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int (*transmit)(struct tpm_dev *dev, uint8_t* buf, size_t cmdlen,
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size_t *buflen);
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};
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struct tpm_chip {
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/* TPM chip id */
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int id;
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/* Indicates whether or not the device and log are functional */
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bool enabled;
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/* TPM device tree node */
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struct dt_node *node;
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/* Event log handler */
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struct _TpmLogMgr logmgr;
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/* TPM device handler */
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struct tpm_dev *dev;
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/* TPM driver handler */
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struct tpm_driver *driver;
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struct list_node link;
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};
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/* TSS tweak */
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typedef struct tpm_chip TpmTarget;
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/*
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* Register a tpm chip by binding the driver to dev.
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* Event log is also registered by this function.
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*/
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extern int tpm_register_chip(struct dt_node *node, struct tpm_dev *dev,
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struct tpm_driver *driver);
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/*
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* tpm_extendl - For each TPM device, this extends the sha1 and sha 256 digests
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* to the indicated PCR and also records an event for the same PCR
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* in the event log
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* This calls a TSS extend function that supports multibank. Both sha1 and
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* sha256 digests are extended in a single operation sent to the TPM device.
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*
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* @pcr: PCR number to be extended and recorded in the event log. The same PCR
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* number is extende for both sha1 and sha256 banks.
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* @alg1: SHA algorithm of digest1. Either TPM_ALG_SHA1 or TPM_ALG_SHA256
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* @digest1: digest1 buffer
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* @size1: size of digest1. Either TPM_ALG_SHA1_SIZE or TPM_ALG_SHA256_SIZE
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* @alg2: SHA algorithm of digest2. Either TPM_ALG_SHA1 or TPM_ALG_SHA256
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* @digest2: digest2 buffer
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* @size2: size of digest2. Either TPM_ALG_SHA1_SIZE or TPM_ALG_SHA256_SIZE
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* @event_type: event type log. In skiboot, either EV_ACTION or EV_SEPARATOR.
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* @event_msg: event log message that describes the event
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*
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* Returns O for success or a negative number if it fails.
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*/
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extern int tpm_extendl(TPM_Pcr pcr,
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TPM_Alg_Id alg1, uint8_t* digest1, size_t size1,
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TPM_Alg_Id alg2, uint8_t* digest2, size_t size2,
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uint32_t event_type, const char* event_msg);
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/* Add status property to the TPM devices */
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extern void tpm_add_status_property(void);
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extern int tpm_init(void);
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extern void tpm_cleanup(void);
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#endif /* __TPM_H */
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