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/* Copyright 2017 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "console.h"
#include "endian.h"
#include "extension.h"
#include "host_command.h"
#include "timer.h"
#include "tpm_log.h"
#include "tpm_vendor_cmds.h"
#include "usb_pd.h"
#include "util.h"
/*
* TPM event logging uses the standard 'event_log_entry' as its storage,
* with no additional payload bytes.
*/
#define TPM_EVENT_LOG_SIZE sizeof(struct event_log_entry)
void tpm_log_event(enum tpm_event type, uint16_t data)
{
uint32_t timestamp = get_time().val >> EVENT_LOG_TIMESTAMP_SHIFT;
log_add_event(type, 0, data, NULL, timestamp);
}
static enum vendor_cmd_rc vc_pop_log_entry(enum vendor_cmd_cc code,
void *buf,
size_t input_size,
size_t *response_size)
{
struct event_log_entry *entry = buf;
int byte_size = log_dequeue_event(entry);
if (entry->type == EVENT_LOG_NO_ENTRY) {
*response_size = 0;
return VENDOR_RC_SUCCESS;
}
if (byte_size != TPM_EVENT_LOG_SIZE)
return VENDOR_RC_INTERNAL_ERROR;
entry->timestamp = htobe32(entry->timestamp);
entry->data = htobe16(entry->data);
*response_size = byte_size;
return VENDOR_RC_SUCCESS;
}
DECLARE_VENDOR_COMMAND(VENDOR_CC_POP_LOG_ENTRY, vc_pop_log_entry);
#ifdef CONFIG_CMD_TPM_LOG
/* Store an entry in the TPM event log, for testing. */
int command_tpm_log(int argc, char **argv)
{
enum tpm_event type = 0;
uint16_t data = 0;
char *e;
if (argc >= 2) {
type = strtoi(argv[1], &e, 10);
if (*e)
return EC_ERROR_PARAM1;
}
if (argc >= 3) {
data = strtoi(argv[2], &e, 10);
if (*e)
return EC_ERROR_PARAM2;
}
tpm_log_event(type, data);
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(tpm_log,
command_tpm_log,
"<type> <data>",
"Write an entry to TPM log");
#endif /* CONFIG_CMD_TPM_LOG */
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