44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
/* Copyright 2016 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "console.h"
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#include "tpm_manufacture.h"
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#include "Global.h"
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#include "NV_fp.h"
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#include "Platform.h"
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#include "TPM_Types.h"
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#include "TpmBuildSwitches.h"
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#include "tpm_types.h"
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#define CPRINTF(format, args...) cprintf(CC_EXTENSION, format, ## args)
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#define EK_CERT_NV_START_INDEX 0x01C00000
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int tpm_manufactured(void)
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{
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uint32_t nv_ram_index;
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const uint32_t rsa_ek_nv_index = EK_CERT_NV_START_INDEX;
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const uint32_t ecc_ek_nv_index = EK_CERT_NV_START_INDEX + 1;
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/*
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* If nvram_index (value written at NV RAM offset of zero) is all
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* ones, or either endorsement certificate is not installed, consider
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* the chip un-manufactured.
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*
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* Thus, wiping flash NV ram allows to re-manufacture the chip.
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*/
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_plat__NvMemoryRead(0, sizeof(nv_ram_index), &nv_ram_index);
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if ((nv_ram_index == ~0) ||
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(NvIsUndefinedIndex(rsa_ek_nv_index) == TPM_RC_SUCCESS) ||
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(NvIsUndefinedIndex(ecc_ek_nv_index) == TPM_RC_SUCCESS)) {
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CPRINTF("%s: NOT manufactured\n", __func__);
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return 0;
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}
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CPRINTF("%s: manufactured\n", __func__);
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return 1;
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}
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