mirror of
https://github.com/Atmosphere-NX/Atmosphere
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89 lines
3.3 KiB
C++
89 lines
3.3 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_cache.hpp"
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#include "secmon_map.hpp"
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namespace ams::secmon {
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namespace {
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constexpr inline const uintptr_t BootCodeAddress = MemoryRegionVirtualTzramBootCode.GetAddress();
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constexpr inline const size_t BootCodeSize = MemoryRegionVirtualTzramBootCode.GetSize();
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using namespace ams::mmu;
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constexpr void UnmapBootCodeImpl(u64 *l1, u64 *l2, u64 *l3, uintptr_t boot_code, size_t boot_code_size) {
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/* Unmap the L3 entries corresponding to the boot code. */
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InvalidateL3Entries(l3, boot_code, boot_code_size);
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}
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constexpr void UnmapTzramImpl(u64 *l1, u64 *l2, u64 *l3) {
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/* Unmap the L3 entries corresponding to tzram. */
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InvalidateL3Entries(l3, MemoryRegionPhysicalTzram.GetAddress(), MemoryRegionPhysicalTzram.GetSize());
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/* Unmap the L2 entries corresponding to those L3 entries. */
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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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void ClearLow(uintptr_t address, size_t size) {
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/* Clear the low part. */
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util::ClearMemory(reinterpret_cast<void *>(address), size / 2);
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}
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void ClearHigh(uintptr_t address, size_t size) {
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/* Clear the high part. */
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util::ClearMemory(reinterpret_cast<void *>(address + size / 2), size / 2);
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}
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}
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void ClearBootCodeHigh() {
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ClearHigh(BootCodeAddress, BootCodeSize);
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}
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void UnmapBootCode() {
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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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/* Clear the low boot code region; high was already cleared by a previous call. */
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ClearLow(BootCodeAddress, BootCodeSize);
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/* Unmap. */
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UnmapBootCodeImpl(l1, l2_l3, l2_l3, BootCodeAddress, BootCodeSize);
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/* Ensure the mappings are consistent. */
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secmon::EnsureMappingConsistency();
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}
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void UnmapTzram() {
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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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UnmapTzramImpl(l1, l2_l3, l2_l3);
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/* Ensure the mappings are consistent. */
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secmon::EnsureMappingConsistency();
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}
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}
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