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422 lines
19 KiB
C++
422 lines
19 KiB
C++
/*
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* Copyright (c) 2018-2020 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <exosphere.hpp>
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#include "secmon_boot.hpp"
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#include "secmon_boot_cache.hpp"
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#include "../secmon_setup.hpp"
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#include "../secmon_key_storage.hpp"
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namespace ams::secmon::boot {
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namespace {
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void ValidateSystemCounters() {
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const uintptr_t sysctr0 = MemoryRegionVirtualDeviceSysCtr0.GetAddress();
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/* Validate the system counter frequency is as expected. */
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AMS_ABORT_UNLESS(reg::Read(sysctr0 + SYSCTR0_CNTFID0) == 19'200'000u);
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/* Validate the system counters are as expected. */
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AMS_ABORT_UNLESS(reg::Read(sysctr0 + SYSCTR0_COUNTERID( 0)) == 0);
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AMS_ABORT_UNLESS(reg::Read(sysctr0 + SYSCTR0_COUNTERID( 1)) == 0);
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AMS_ABORT_UNLESS(reg::Read(sysctr0 + SYSCTR0_COUNTERID( 2)) == 0);
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AMS_ABORT_UNLESS(reg::Read(sysctr0 + SYSCTR0_COUNTERID( 3)) == 0);
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AMS_ABORT_UNLESS(reg::Read(sysctr0 + SYSCTR0_COUNTERID( 4)) == 0);
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AMS_ABORT_UNLESS(reg::Read(sysctr0 + SYSCTR0_COUNTERID( 5)) == 0);
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AMS_ABORT_UNLESS(reg::Read(sysctr0 + SYSCTR0_COUNTERID( 6)) == 0);
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AMS_ABORT_UNLESS(reg::Read(sysctr0 + SYSCTR0_COUNTERID( 7)) == 0);
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AMS_ABORT_UNLESS(reg::Read(sysctr0 + SYSCTR0_COUNTERID( 8)) == 0);
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AMS_ABORT_UNLESS(reg::Read(sysctr0 + SYSCTR0_COUNTERID( 9)) == 0);
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AMS_ABORT_UNLESS(reg::Read(sysctr0 + SYSCTR0_COUNTERID(10)) == 0);
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AMS_ABORT_UNLESS(reg::Read(sysctr0 + SYSCTR0_COUNTERID(11)) == 0);
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}
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void SetupPmcRegisters() {
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const auto pmc = MemoryRegionVirtualDevicePmc.GetAddress();
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/* Set the physical address of the warmboot binary to scratch 1. */
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if (GetSocType() == fuse::SocType_Mariko) {
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reg::Write(pmc + APBDEV_PMC_SECURE_SCRATCH119, static_cast<u32>(MemoryRegionPhysicalDramSecureDataStoreWarmbootFirmware.GetAddress()));
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} else /* if (GetSocType() == fuse::SocType_Erista) */ {
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reg::Write(pmc + APBDEV_PMC_SCRATCH1, static_cast<u32>(MemoryRegionPhysicalDramSecureDataStoreWarmbootFirmware.GetAddress()));
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}
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/* Configure logging by setting bits 18-19 of scratch 20. */
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reg::ReadWrite(pmc + APBDEV_PMC_SCRATCH20, REG_BITS_VALUE(18, 2, 0));
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/* Clear the wdt reset flag. */
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reg::ReadWrite(pmc + APBDEV_PMC_SCRATCH190, REG_BITS_VALUE(0, 1, 0));
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/* Configure warmboot to set Set FUSE_PRIVATEKEYDISABLE to KEY_INVISIBLE. */
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reg::ReadWrite(pmc + APBDEV_PMC_SECURE_SCRATCH21, REG_BITS_VALUE(4, 1, 1));
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/* Write the warmboot key. */
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/* TODO: This is necessary for mariko. We should decide how to handle this. */
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/* In particular, mariko will need to support loading older-than-expected warmboot firmware. */
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/* We could hash the warmboot firmware and use a lookup table, or require bootloader to provide */
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/* The warmboot key as a parameter. The latter is a better solution, but it would be nice to take */
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/* care of it here. Perhaps we should read the number of anti-downgrade fuses burnt, and translate that */
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/* to the warmboot key? To be decided during the process of implementing ams-on-mariko support. */
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reg::Write(pmc + APBDEV_PMC_SECURE_SCRATCH32, 0x129);
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}
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/* This function derives the master kek and device keys using the tsec root key. */
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void DeriveMasterKekAndDeviceKeyErista(bool is_prod) {
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/* NOTE: Exosphere does not use this in practice, and expects the bootloader to set up keys already. */
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/* NOTE: This function is currently not implemented. If implemented, it will only be a reference implementation. */
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if constexpr (false) {
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/* TODO: Consider implementing this as a reference. */
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}
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AMS_UNUSED(is_prod);
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}
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void DeriveMasterKekAndDeviceKeyMariko(bool is_prod) {
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/* Clear all keyslots other than KEK and SBK in SE1. */
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for (int i = 0; i < pkg1::AesKeySlot_Count; ++i) {
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if (i != pkg1::AesKeySlot_MarikoKek && i != pkg1::AesKeySlot_SecureBoot) {
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se::ClearAesKeySlot(i);
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}
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}
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/* Clear all keyslots in SE2. */
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for (int i = 0; i < pkg1::AesKeySlot_Count; ++i) {
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se::ClearAesKeySlot2(i);
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}
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/* Derive the master kek. */
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se::SetEncryptedAesKey128(pkg1::AesKeySlot_MasterKek, pkg1::AesKeySlot_MarikoKek, GetMarikoMasterKekSource(is_prod), se::AesBlockSize);
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/* Derive the device master key source kek. */
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se::SetEncryptedAesKey128(pkg1::AesKeySlot_DeviceMasterKeySourceKekMariko, pkg1::AesKeySlot_SecureBoot, GetDeviceMasterKeySourceKekSource(), se::AesBlockSize);
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/* Clear the KEK, now that we're done using it. */
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se::ClearAesKeySlot(pkg1::AesKeySlot_MarikoKek);
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}
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void DeriveMasterKekAndDeviceKey(bool is_prod) {
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if (GetSocType() == fuse::SocType_Mariko) {
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DeriveMasterKekAndDeviceKeyMariko(is_prod);
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} else /* if (GetSocType() == fuse::SocType_Erista) */ {
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DeriveMasterKekAndDeviceKeyErista(is_prod);
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}
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}
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void DeriveMasterKey() {
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if (GetSocType() == fuse::SocType_Mariko) {
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se::SetEncryptedAesKey128(pkg1::AesKeySlot_Master, pkg1::AesKeySlot_MasterKek, GetMasterKeySource(), se::AesBlockSize);
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} else /* if (GetSocType() == fuse::SocType_Erista) */ {
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/* Nothing to do here; erista bootloader will have derived master key already. */
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}
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}
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void SetupRandomKey(int slot, se::KeySlotLockFlags flags) {
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/* Create an aligned buffer to hold the key. */
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constexpr size_t KeySize = se::AesBlockSize;
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util::AlignedBuffer<hw::DataCacheLineSize, KeySize> key;
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/* Ensure data is consistent before triggering the SE. */
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hw::FlushDataCache(key, KeySize);
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hw::DataSynchronizationBarrierInnerShareable();
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/* Generate random bytes into the key. */
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se::GenerateRandomBytes(key, KeySize);
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/* Ensure that the CPU sees consistent data. */
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hw::DataSynchronizationBarrierInnerShareable();
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hw::FlushDataCache(key, KeySize);
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hw::DataSynchronizationBarrierInnerShareable();
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/* Use the random bytes as a key source. */
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se::SetEncryptedAesKey128(slot, pkg1::AesKeySlot_DeviceMaster, key, KeySize);
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/* Lock the keyslot. */
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se::LockAesKeySlot(slot, flags);
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}
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bool TestKeyGeneration(int generation, bool is_prod) {
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/* Decrypt the vector chain from generation to start. */
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int slot = pkg1::AesKeySlot_Master;
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for (int i = generation; i > 0; --i) {
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se::SetEncryptedAesKey128(pkg1::AesKeySlot_Temporary, slot, GetMasterKeyVector(is_prod, i), se::AesBlockSize);
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slot = pkg1::AesKeySlot_Temporary;
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}
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/* Decrypt the final vector. */
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u8 test_vector[se::AesBlockSize];
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se::DecryptAes128(test_vector, se::AesBlockSize, slot, GetMasterKeyVector(is_prod, 0), se::AesBlockSize);
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constexpr u8 ZeroBlock[se::AesBlockSize] = {};
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return crypto::IsSameBytes(ZeroBlock, test_vector, se::AesBlockSize);
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}
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int DetermineKeyGeneration(bool is_prod) {
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/* Test each generation in order. */
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for (int generation = 0; generation < pkg1::KeyGeneration_Count; ++generation) {
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if (TestKeyGeneration(generation, is_prod)) {
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return generation;
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}
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}
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/* We must have found a correct key generation. */
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AMS_ABORT();
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}
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void DeriveAllMasterKeys(bool is_prod, u8 * const work_block) {
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/* Determine the generation. */
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const int generation = DetermineKeyGeneration(is_prod);
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AMS_SECMON_LOG("KeyGen: %02X\n", static_cast<unsigned int>(generation));
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/* Set the global generation. */
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::ams::secmon::impl::SetKeyGeneration(generation);
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/* Derive all old keys. */
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int slot = pkg1::AesKeySlot_Master;
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for (int i = generation; i > 0; --i) {
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/* Decrypt the old master key. */
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se::DecryptAes128(work_block, se::AesBlockSize, slot, GetMasterKeyVector(is_prod, i), se::AesBlockSize);
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/* Set the old master key. */
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SetMasterKey(i - 1, work_block, se::AesBlockSize);
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/* Set the old master key into a temporary keyslot. */
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se::SetAesKey(pkg1::AesKeySlot_Temporary, work_block, se::AesBlockSize);
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/* Perform the next decryption with the older master key. */
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slot = pkg1::AesKeySlot_Temporary;
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}
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}
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void DeriveAllDeviceMasterKeys(bool is_prod, u8 * const work_block) {
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/* Get the current key generation. */
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const int current_generation = secmon::GetKeyGeneration();
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/* Get the kek slot. */
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const int kek_slot = GetSocType() == fuse::SocType_Mariko ? pkg1::AesKeySlot_DeviceMasterKeySourceKekMariko : pkg1::AesKeySlot_DeviceMasterKeySourceKekErista;
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/* Iterate for all generations. */
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for (int i = 0; i < pkg1::OldDeviceMasterKeyCount; ++i) {
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const int generation = pkg1::KeyGeneration_4_0_0 + i;
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/* Load the first master key into the temporary keyslot keyslot. */
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LoadMasterKey(pkg1::AesKeySlot_Temporary, pkg1::KeyGeneration_1_0_0);
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/* Decrypt the device master kek for the generation. */
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se::SetEncryptedAesKey128(pkg1::AesKeySlot_Temporary, pkg1::AesKeySlot_Temporary, GetDeviceMasterKekSource(is_prod, i), se::AesBlockSize);
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/* Decrypt the device master key source into the work block. */
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se::DecryptAes128(work_block, se::AesBlockSize, kek_slot, GetDeviceMasterKeySourceSource(i), se::AesBlockSize);
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/* If we're decrypting the current device master key, decrypt into the keyslot. */
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if (generation == current_generation) {
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se::SetEncryptedAesKey128(pkg1::AesKeySlot_DeviceMaster, pkg1::AesKeySlot_Temporary, work_block, se::AesBlockSize);
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} else {
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/* Otherwise, decrypt the work block into itself and set the old device master key. */
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se::DecryptAes128(work_block, se::AesBlockSize, pkg1::AesKeySlot_Temporary, work_block, se::AesBlockSize);
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/* Set the device master key. */
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SetDeviceMasterKey(generation, work_block, se::AesBlockSize);
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}
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}
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/* Clear and lock the Device Master Key Source Kek. */
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se::ClearAesKeySlot(pkg1::AesKeySlot_DeviceMasterKeySourceKekMariko);
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se::LockAesKeySlot(pkg1::AesKeySlot_DeviceMasterKeySourceKekMariko, se::KeySlotLockFlags_AllLockKek);
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}
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void DeriveAllKeys(bool is_prod) {
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/* Get the ephemeral work block. */
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u8 * const work_block = se::GetEphemeralWorkBlock();
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ON_SCOPE_EXIT { util::ClearMemory(work_block, se::AesBlockSize); };
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/* Lock the master key as a key. */
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se::LockAesKeySlot(pkg1::AesKeySlot_Master, se::KeySlotLockFlags_AllLockKey);
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/* Setup a random key to protect the old master and device master keys. */
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SetupRandomKey(pkg1::AesKeySlot_RandomForKeyStorageWrap, se::KeySlotLockFlags_AllLockKey);
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/* Derive the master keys. */
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DeriveAllMasterKeys(is_prod, work_block);
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/* Lock the master key as a kek. */
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se::LockAesKeySlot(pkg1::AesKeySlot_Master, se::KeySlotLockFlags_AllLockKek);
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/* Derive the device master keys. */
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DeriveAllDeviceMasterKeys(is_prod, work_block);
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/* Lock the device master key as a kek. */
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se::LockAesKeySlot(pkg1::AesKeySlot_DeviceMaster, se::KeySlotLockFlags_AllLockKek);
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/* Setup a random key to protect user keys. */
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SetupRandomKey(pkg1::AesKeySlot_RandomForUserWrap, se::KeySlotLockFlags_AllLockKek);
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}
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void InitializeKeys() {
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/* Read lock all aes keys. */
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for (int i = 0; i < se::AesKeySlotCount; ++i) {
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se::LockAesKeySlot(i, se::KeySlotLockFlags_AllReadLock);
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}
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/* Lock the secure monitor aes keys to be secmon only and non-readable. */
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for (int i = pkg1::AesKeySlot_SecmonStart; i < pkg1::AesKeySlot_SecmonEnd; ++i) {
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se::LockAesKeySlot(i, se::KeySlotLockFlags_KeyUse | se::KeySlotLockFlags_PerKey);
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}
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/* Lock the unused keyslots entirely. */
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static_assert(pkg1::AesKeySlot_UserEnd <= pkg1::AesKeySlot_SecmonStart);
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for (int i = pkg1::AesKeySlot_UserEnd; i < pkg1::AesKeySlot_SecmonStart; ++i) {
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se::LockAesKeySlot(i, se::KeySlotLockFlags_AllLockKek);
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}
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/* Read lock all rsa keys. */
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for (int i = 0; i < se::RsaKeySlotCount; ++i) {
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se::LockRsaKeySlot(i, se::KeySlotLockFlags_KeyUse | se::KeySlotLockFlags_PerKey | se::KeySlotLockFlags_KeyRead);
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}
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/* Initialize the rng. */
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se::InitializeRandom();
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/* Determine whether we're production. */
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const bool is_prod = IsProduction();
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/* Derive the master kek and device key. */
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/* NOTE: This is a no-op on erista, because fusee will have set up keys. */
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DeriveMasterKekAndDeviceKey(is_prod);
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/* Lock the device key as only usable as a kek. */
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se::LockAesKeySlot(pkg1::AesKeySlot_Device, se::KeySlotLockFlags_AllLockKek);
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/* Derive the master key. */
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DeriveMasterKey();
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/* Derive all other keys. */
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DeriveAllKeys(is_prod);
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}
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}
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namespace {
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using namespace ams::mmu;
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constexpr void UnmapPhysicalIdentityMappingImpl(u64 *l1, u64 *l2, u64 *l3) {
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/* Invalidate the L3 entries for the tzram and iram boot code regions. */
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InvalidateL3Entries(l3, MemoryRegionPhysicalTzram.GetAddress(), MemoryRegionPhysicalTzram.GetSize());
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InvalidateL3Entries(l3, MemoryRegionPhysicalIramBootCode.GetAddress(), MemoryRegionPhysicalIramBootCode.GetSize());
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/* Unmap the L2 entries corresponding to those L3 entries. */
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InvalidateL2Entries(l2, MemoryRegionPhysicalIramL2.GetAddress(), MemoryRegionPhysicalIramL2.GetSize());
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InvalidateL2Entries(l2, MemoryRegionPhysicalTzramL2.GetAddress(), MemoryRegionPhysicalTzramL2.GetSize());
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/* Unmap the L1 entry corresponding to to those L2 entries. */
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InvalidateL1Entries(l1, MemoryRegionPhysical.GetAddress(), MemoryRegionPhysical.GetSize());
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}
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constexpr void UnmapDramImpl(u64 *l1, u64 *l2, u64 *l3) {
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/* Unmap the L1 entry corresponding to to the Dram entries. */
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AMS_UNUSED(l2, l3);
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InvalidateL1Entries(l1, MemoryRegionDram.GetAddress(), MemoryRegionDram.GetSize());
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}
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constexpr void UnmapMarikoProgramImpl(u64 *l1, u64 *l2, u64 *l3) {
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/* Unmap the L1 entry corresponding to to the Dram entries. */
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AMS_UNUSED(l1, l2);
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InvalidateL3Entries(l3, MemoryRegionVirtualTzramMarikoProgram.GetAddress(), MemoryRegionVirtualTzramMarikoProgram.GetSize());
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}
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}
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void InitializeColdBoot() {
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/* Ensure that the system counters are valid. */
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ValidateSystemCounters();
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/* Set the security engine to Tzram Secure. */
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se::SetTzramSecure();
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/* Set the security engine to Per Key Secure. */
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se::SetPerKeySecure();
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/* Set the security engine to Context Save Secure. */
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se::SetContextSaveSecure();
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/* Setup the PMC registers. */
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SetupPmcRegisters();
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/* Lockout the scratch that we've just written. */
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/* pmc::LockSecureRegisters(1); */
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/* Generate a random srk. */
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se::GenerateSrk();
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/* Initialize the SE keyslots. */
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InitializeKeys();
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/* Save a test vector for the SE keyslots. */
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SaveSecurityEngineAesKeySlotTestVector();
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}
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void UnmapPhysicalIdentityMapping() {
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/* Get the tables. */
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u64 * const l1 = MemoryRegionVirtualTzramL1PageTable.GetPointer<u64>();
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u64 * const l2_l3 = MemoryRegionVirtualTzramL2L3PageTable.GetPointer<u64>();
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/* Unmap. */
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UnmapPhysicalIdentityMappingImpl(l1, l2_l3, l2_l3);
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/* Ensure the mappings are consistent. */
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secmon::boot::EnsureMappingConsistency();
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}
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void UnmapDram() {
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/* Get the tables. */
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u64 * const l1 = MemoryRegionVirtualTzramL1PageTable.GetPointer<u64>();
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u64 * const l2_l3 = MemoryRegionVirtualTzramL2L3PageTable.GetPointer<u64>();
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/* Unmap. */
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UnmapDramImpl(l1, l2_l3, l2_l3);
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/* Ensure the mappings are consistent. */
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secmon::boot::EnsureMappingConsistency();
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}
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void LoadMarikoProgram() {
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void * const mariko_program_dst = MemoryRegionVirtualTzramMarikoProgram.GetPointer<void>();
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void * const mariko_program_src = MemoryRegionPhysicalMarikoProgramImage.GetPointer<void>();
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const size_t mariko_program_size = MemoryRegionVirtualTzramMarikoProgram.GetSize();
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if (fuse::GetSocType() == fuse::SocType_Mariko) {
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/* On Mariko, we want to load the mariko program image into mariko tzram. */
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std::memcpy(mariko_program_dst, mariko_program_src, mariko_program_size);
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hw::FlushDataCache(mariko_program_dst, mariko_program_size);
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} else {
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/* On Erista, we don't have mariko-only-tzram, so unmap it. */
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u64 * const l1 = MemoryRegionVirtualTzramL1PageTable.GetPointer<u64>();
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u64 * const l2_l3 = MemoryRegionVirtualTzramL2L3PageTable.GetPointer<u64>();
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UnmapMarikoProgramImpl(l1, l2_l3, l2_l3);
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}
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/* Clear the Mariko program image from DRAM. */
|
|
util::ClearMemory(mariko_program_src, mariko_program_size);
|
|
hw::FlushDataCache(mariko_program_src, mariko_program_size);
|
|
hw::DataSynchronizationBarrierInnerShareable();
|
|
|
|
/* Ensure the mappings are consistent. */
|
|
secmon::boot::EnsureMappingConsistency();
|
|
}
|
|
|
|
}
|