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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 "config.h"
#include "Global.h"
#include "board.h"
#include "console.h"
#include "endian.h"
#include "extension.h"
#include "system.h"
#include "util.h"
#define CPRINTS(format, args...) cprints(CC_SYSTEM, format, ## args)
/*
* The below structure represents the body of the response to the 'report tpm
* state' vendor command.
*
* It will be transferred over the wire, so it needs to be
* serialized/deserialized, and it is likely to change, so its contents must
* be versioned.
*/
#define TPM_STATE_VERSION 1
struct tpm_state {
uint32_t version;
uint32_t fail_line; /* s_failLIne */
uint32_t fail_code; /* s_failCode */
char func_name[4]; /* s_failFunction, limited to 4 chars */
uint32_t failed_tries; /* gp.failedTries */
uint32_t max_tries; /* gp.maxTries */
/* The below fields are present in version 2 and above. */
} __packed;
static void serialize_u32(void *buf, uint32_t value)
{
value = htobe32(value);
memcpy(buf, &value, sizeof(value));
}
static enum vendor_cmd_rc report_tpm_state(enum vendor_cmd_cc code,
void *buf,
size_t input_size,
size_t *response_size)
{
struct tpm_state *state = buf;
CPRINTS("%s", __func__);
memset(state, 0, sizeof(*state));
if (board_id_is_mismatched()) {
s_failCode = 0xbadc0de;
s_failLine = __LINE__;
memcpy(&s_failFunction, __func__, sizeof(s_failFunction));
}
serialize_u32(&state->version, TPM_STATE_VERSION);
serialize_u32(&state->fail_code, s_failCode);
serialize_u32(&state->fail_line, s_failLine);
serialize_u32(&state->failed_tries, gp.failedTries);
serialize_u32(&state->max_tries, gp.maxTries);
if (s_failFunction)
memcpy(state->func_name, (void *)&s_failFunction,
sizeof(state->func_name));
*response_size = sizeof(*state);
return VENDOR_RC_SUCCESS;
}
DECLARE_VENDOR_COMMAND(VENDOR_CC_REPORT_TPM_STATE, report_tpm_state);
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