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kern: start KPageTable(Impl) refactor, use array-with-levels for KPageTableImpl

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This commit is contained in:
Michael Scire 2024-10-10 05:31:57 -07:00 committed by SciresM
parent 7aa0bed869
commit 02e837d82e
3 changed files with 205 additions and 230 deletions
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13
libraries/libmesosphere/include/mesosphere/arch/arm64/kern_k_page_table_entry.hpp
View File

@ -170,9 +170,17 @@ namespace ams::kern::arch::arm64 {
constexpr ALWAYS_INLINE bool IsReadOnly() const { return this->GetBits(7, 1) != 0; }
constexpr ALWAYS_INLINE bool IsUserAccessible() const { return this->GetBits(6, 1) != 0; }
constexpr ALWAYS_INLINE bool IsNonSecure() const { return this->GetBits(5, 1) != 0; }
constexpr ALWAYS_INLINE u64 GetTestTableMask() const { return (m_attributes & ExtensionFlag_TestTableMask); }
constexpr ALWAYS_INLINE bool IsBlock() const { return (m_attributes & ExtensionFlag_TestTableMask) == ExtensionFlag_Valid; }
constexpr ALWAYS_INLINE bool IsPage() const { return (m_attributes & ExtensionFlag_TestTableMask) == ExtensionFlag_TestTableMask; }
constexpr ALWAYS_INLINE bool IsTable() const { return (m_attributes & ExtensionFlag_TestTableMask) == 2; }
constexpr ALWAYS_INLINE bool IsEmpty() const { return (m_attributes & ExtensionFlag_TestTableMask) == 0; }
constexpr ALWAYS_INLINE KPhysicalAddress GetTable() const { return this->SelectBits(12, 36); }
constexpr ALWAYS_INLINE bool IsMappedTable() const { return this->GetBits(0, 2) == 3; }
constexpr ALWAYS_INLINE bool IsMapped() const { return this->GetBits(0, 1) != 0; }
constexpr ALWAYS_INLINE decltype(auto) SetUserExecuteNever(bool en) { this->SetBit(54, en); return *this; }
@ -196,10 +204,13 @@ namespace ams::kern::arch::arm64 {
return (m_attributes & BaseMaskForMerge) == attr;
}
constexpr ALWAYS_INLINE u64 GetRawAttributesUnsafeForSwap() const {
constexpr ALWAYS_INLINE u64 GetRawAttributesUnsafe() const {
return m_attributes;
}
constexpr ALWAYS_INLINE u64 GetRawAttributesUnsafeForSwap() const {
return m_attributes;
}
protected:
constexpr ALWAYS_INLINE u64 GetRawAttributes() const {
return m_attributes;

34
libraries/libmesosphere/include/mesosphere/arch/arm64/kern_k_page_table_impl.hpp
View File

@ -37,10 +37,17 @@ namespace ams::kern::arch::arm64 {
constexpr bool IsTailMergeDisabled() const { return (this->sw_reserved_bits & PageTableEntry::SoftwareReservedBit_DisableMergeHeadTail) != 0; }
};
enum EntryLevel : u32 {
EntryLevel_L3 = 0,
EntryLevel_L2 = 1,
EntryLevel_L1 = 2,
EntryLevel_Count = 3,
};
struct TraversalContext {
const L1PageTableEntry *l1_entry;
const L2PageTableEntry *l2_entry;
const L3PageTableEntry *l3_entry;
const PageTableEntry *level_entries[EntryLevel_Count];
EntryLevel level;
bool is_contiguous;
};
private:
static constexpr size_t PageBits = util::CountTrailingZeros(PageSize);
@ -53,16 +60,26 @@ namespace ams::kern::arch::arm64 {
return (value >> Offset) & ((1ul << Count) - 1);
}
static constexpr ALWAYS_INLINE u64 GetBits(u64 value, size_t offset, size_t count) {
return (value >> offset) & ((1ul << count) - 1);
}
template<size_t Offset, size_t Count>
constexpr ALWAYS_INLINE u64 SelectBits(u64 value) {
static constexpr ALWAYS_INLINE u64 SelectBits(u64 value) {
return value & (((1ul << Count) - 1) << Offset);
}
static constexpr ALWAYS_INLINE u64 SelectBits(u64 value, size_t offset, size_t count) {
return value & (((1ul << count) - 1) << offset);
}
static constexpr ALWAYS_INLINE uintptr_t GetL0Index(KProcessAddress addr) { return GetBits<PageBits + LevelBits * (NumLevels - 0), LevelBits>(GetInteger(addr)); }
static constexpr ALWAYS_INLINE uintptr_t GetL1Index(KProcessAddress addr) { return GetBits<PageBits + LevelBits * (NumLevels - 1), LevelBits>(GetInteger(addr)); }
static constexpr ALWAYS_INLINE uintptr_t GetL2Index(KProcessAddress addr) { return GetBits<PageBits + LevelBits * (NumLevels - 2), LevelBits>(GetInteger(addr)); }
static constexpr ALWAYS_INLINE uintptr_t GetL3Index(KProcessAddress addr) { return GetBits<PageBits + LevelBits * (NumLevels - 3), LevelBits>(GetInteger(addr)); }
static constexpr ALWAYS_INLINE uintptr_t GetLevelIndex(KProcessAddress addr, EntryLevel level) { return GetBits(GetInteger(addr), PageBits + LevelBits * level, LevelBits); }
static constexpr ALWAYS_INLINE uintptr_t GetL1Offset(KProcessAddress addr) { return GetBits<0, PageBits + LevelBits * (NumLevels - 1)>(GetInteger(addr)); }
static constexpr ALWAYS_INLINE uintptr_t GetL2Offset(KProcessAddress addr) { return GetBits<0, PageBits + LevelBits * (NumLevels - 2)>(GetInteger(addr)); }
static constexpr ALWAYS_INLINE uintptr_t GetL3Offset(KProcessAddress addr) { return GetBits<0, PageBits + LevelBits * (NumLevels - 3)>(GetInteger(addr)); }
@ -70,13 +87,16 @@ namespace ams::kern::arch::arm64 {
static constexpr ALWAYS_INLINE uintptr_t GetContiguousL2Offset(KProcessAddress addr) { return GetBits<0, PageBits + LevelBits * (NumLevels - 2) + 4>(GetInteger(addr)); }
static constexpr ALWAYS_INLINE uintptr_t GetContiguousL3Offset(KProcessAddress addr) { return GetBits<0, PageBits + LevelBits * (NumLevels - 3) + 4>(GetInteger(addr)); }
static constexpr ALWAYS_INLINE uintptr_t GetBlock(const PageTableEntry *pte, EntryLevel level) { return SelectBits(pte->GetRawAttributesUnsafe(), PageBits + LevelBits * level, LevelBits * (NumLevels + 1 - level)); }
static constexpr ALWAYS_INLINE uintptr_t GetOffset(KProcessAddress addr, EntryLevel level) { return GetBits(GetInteger(addr), 0, PageBits + LevelBits * level); }
static ALWAYS_INLINE KVirtualAddress GetPageTableVirtualAddress(KPhysicalAddress addr) {
return KMemoryLayout::GetLinearVirtualAddress(addr);
}
ALWAYS_INLINE bool ExtractL1Entry(TraversalEntry *out_entry, TraversalContext *out_context, const L1PageTableEntry *l1_entry, KProcessAddress virt_addr) const;
ALWAYS_INLINE bool ExtractL2Entry(TraversalEntry *out_entry, TraversalContext *out_context, const L2PageTableEntry *l2_entry, KProcessAddress virt_addr) const;
ALWAYS_INLINE bool ExtractL3Entry(TraversalEntry *out_entry, TraversalContext *out_context, const L3PageTableEntry *l3_entry, KProcessAddress virt_addr) const;
//ALWAYS_INLINE bool ExtractL1Entry(TraversalEntry *out_entry, TraversalContext *out_context, const L1PageTableEntry *l1_entry, KProcessAddress virt_addr) const;
//ALWAYS_INLINE bool ExtractL2Entry(TraversalEntry *out_entry, TraversalContext *out_context, const L2PageTableEntry *l2_entry, KProcessAddress virt_addr) const;
//ALWAYS_INLINE bool ExtractL3Entry(TraversalEntry *out_entry, TraversalContext *out_context, const L3PageTableEntry *l3_entry, KProcessAddress virt_addr) const;
private:
L1PageTableEntry *m_table;
bool m_is_kernel;

388
libraries/libmesosphere/source/arch/arm64/kern_k_page_table_impl.cpp
View File

@ -33,103 +33,98 @@ namespace ams::kern::arch::arm64 {
return m_table;
}
bool KPageTableImpl::ExtractL3Entry(TraversalEntry *out_entry, TraversalContext *out_context, const L3PageTableEntry *l3_entry, KProcessAddress virt_addr) const {
/* Set the L3 entry. */
out_context->l3_entry = l3_entry;
if (l3_entry->IsBlock()) {
/* Set the output entry. */
out_entry->phys_addr = l3_entry->GetBlock() + (virt_addr & (L3BlockSize - 1));
if (l3_entry->IsContiguous()) {
out_entry->block_size = L3ContiguousBlockSize;
} else {
out_entry->block_size = L3BlockSize;
}
out_entry->sw_reserved_bits = l3_entry->GetSoftwareReservedBits();
out_entry->attr = 0;
return true;
} else {
out_entry->phys_addr = Null<KPhysicalAddress>;
out_entry->block_size = L3BlockSize;
out_entry->sw_reserved_bits = 0;
out_entry->attr = 0;
return false;
}
}
bool KPageTableImpl::ExtractL2Entry(TraversalEntry *out_entry, TraversalContext *out_context, const L2PageTableEntry *l2_entry, KProcessAddress virt_addr) const {
/* Set the L2 entry. */
out_context->l2_entry = l2_entry;
if (l2_entry->IsBlock()) {
/* Set the output entry. */
out_entry->phys_addr = l2_entry->GetBlock() + (virt_addr & (L2BlockSize - 1));
if (l2_entry->IsContiguous()) {
out_entry->block_size = L2ContiguousBlockSize;
} else {
out_entry->block_size = L2BlockSize;
}
out_entry->sw_reserved_bits = l2_entry->GetSoftwareReservedBits();
out_entry->attr = 0;
/* Set the output context. */
out_context->l3_entry = nullptr;
return true;
} else if (l2_entry->IsTable()) {
return this->ExtractL3Entry(out_entry, out_context, this->GetL3EntryFromTable(GetPageTableVirtualAddress(l2_entry->GetTable()), virt_addr), virt_addr);
} else {
out_entry->phys_addr = Null<KPhysicalAddress>;
out_entry->block_size = L2BlockSize;
out_entry->sw_reserved_bits = 0;
out_entry->attr = 0;
out_context->l3_entry = nullptr;
return false;
}
}
bool KPageTableImpl::ExtractL1Entry(TraversalEntry *out_entry, TraversalContext *out_context, const L1PageTableEntry *l1_entry, KProcessAddress virt_addr) const {
/* Set the L1 entry. */
out_context->l1_entry = l1_entry;
if (l1_entry->IsBlock()) {
/* Set the output entry. */
out_entry->phys_addr = l1_entry->GetBlock() + (virt_addr & (L1BlockSize - 1));
if (l1_entry->IsContiguous()) {
out_entry->block_size = L1ContiguousBlockSize;
} else {
out_entry->block_size = L1BlockSize;
}
out_entry->sw_reserved_bits = l1_entry->GetSoftwareReservedBits();
/* Set the output context. */
out_context->l2_entry = nullptr;
out_context->l3_entry = nullptr;
return true;
} else if (l1_entry->IsTable()) {
return this->ExtractL2Entry(out_entry, out_context, this->GetL2EntryFromTable(GetPageTableVirtualAddress(l1_entry->GetTable()), virt_addr), virt_addr);
} else {
out_entry->phys_addr = Null<KPhysicalAddress>;
out_entry->block_size = L1BlockSize;
out_entry->sw_reserved_bits = 0;
out_entry->attr = 0;
out_context->l2_entry = nullptr;
out_context->l3_entry = nullptr;
return false;
}
}
// bool KPageTableImpl::ExtractL3Entry(TraversalEntry *out_entry, TraversalContext *out_context, const L3PageTableEntry *l3_entry, KProcessAddress virt_addr) const {
// /* Set the L3 entry. */
// out_context->l3_entry = l3_entry;
//
// if (l3_entry->IsBlock()) {
// /* Set the output entry. */
// out_entry->phys_addr = l3_entry->GetBlock() + (virt_addr & (L3BlockSize - 1));
// if (l3_entry->IsContiguous()) {
// out_entry->block_size = L3ContiguousBlockSize;
// } else {
// out_entry->block_size = L3BlockSize;
// }
// out_entry->sw_reserved_bits = l3_entry->GetSoftwareReservedBits();
// out_entry->attr = 0;
//
// return true;
// } else {
// out_entry->phys_addr = Null<KPhysicalAddress>;
// out_entry->block_size = L3BlockSize;
// out_entry->sw_reserved_bits = 0;
// out_entry->attr = 0;
// return false;
// }
// }
//
// bool KPageTableImpl::ExtractL2Entry(TraversalEntry *out_entry, TraversalContext *out_context, const L2PageTableEntry *l2_entry, KProcessAddress virt_addr) const {
// /* Set the L2 entry. */
// out_context->l2_entry = l2_entry;
//
// if (l2_entry->IsBlock()) {
// /* Set the output entry. */
// out_entry->phys_addr = l2_entry->GetBlock() + (virt_addr & (L2BlockSize - 1));
// if (l2_entry->IsContiguous()) {
// out_entry->block_size = L2ContiguousBlockSize;
// } else {
// out_entry->block_size = L2BlockSize;
// }
// out_entry->sw_reserved_bits = l2_entry->GetSoftwareReservedBits();
// out_entry->attr = 0;
//
// /* Set the output context. */
// out_context->l3_entry = nullptr;
// return true;
// } else if (l2_entry->IsTable()) {
// return this->ExtractL3Entry(out_entry, out_context, this->GetL3EntryFromTable(GetPageTableVirtualAddress(l2_entry->GetTable()), virt_addr), virt_addr);
// } else {
// out_entry->phys_addr = Null<KPhysicalAddress>;
// out_entry->block_size = L2BlockSize;
// out_entry->sw_reserved_bits = 0;
// out_entry->attr = 0;
//
// out_context->l3_entry = nullptr;
// return false;
// }
// }
//
// bool KPageTableImpl::ExtractL1Entry(TraversalEntry *out_entry, TraversalContext *out_context, const L1PageTableEntry *l1_entry, KProcessAddress virt_addr) const {
// /* Set the L1 entry. */
// out_context->level_entries[EntryLevel_L1] = l1_entry;
//
// if (l1_entry->IsBlock()) {
// /* Set the output entry. */
// out_entry->phys_addr = l1_entry->GetBlock() + (virt_addr & (L1BlockSize - 1));
// if (l1_entry->IsContiguous()) {
// out_entry->block_size = L1ContiguousBlockSize;
// } else {
// out_entry->block_size = L1BlockSize;
// }
// out_entry->sw_reserved_bits = l1_entry->GetSoftwareReservedBits();
//
// /* Set the output context. */
// out_context->l2_entry = nullptr;
// out_context->l3_entry = nullptr;
// return true;
// } else if (l1_entry->IsTable()) {
// return this->ExtractL2Entry(out_entry, out_context, this->GetL2EntryFromTable(GetPageTableVirtualAddress(l1_entry->GetTable()), virt_addr), virt_addr);
// } else {
// out_entry->phys_addr = Null<KPhysicalAddress>;
// out_entry->block_size = L1BlockSize;
// out_entry->sw_reserved_bits = 0;
// out_entry->attr = 0;
//
// out_context->l2_entry = nullptr;
// out_context->l3_entry = nullptr;
// return false;
// }
// }
bool KPageTableImpl::BeginTraversal(TraversalEntry *out_entry, TraversalContext *out_context, KProcessAddress address) const {
/* Setup invalid defaults. */
out_entry->phys_addr = Null<KPhysicalAddress>;
out_entry->block_size = L1BlockSize;
out_entry->sw_reserved_bits = 0;
out_entry->attr = 0;
out_context->l1_entry = m_table + m_num_entries;
out_context->l2_entry = nullptr;
out_context->l3_entry = nullptr;
*out_entry = {};
*out_context = {};
/* Validate that we can read the actual entry. */
const size_t l0_index = GetL0Index(address);
@ -146,125 +141,79 @@ namespace ams::kern::arch::arm64 {
}
}
/* Extract the entry. */
const bool valid = this->ExtractL1Entry(out_entry, out_context, this->GetL1Entry(address), address);
/* Get the L1 entry, and check if it's a table. */
out_context->level_entries[EntryLevel_L1] = this->GetL1Entry(address);
if (out_context->level_entries[EntryLevel_L1]->IsMappedTable()) {
/* Get the L2 entry, and check if it's a table. */
out_context->level_entries[EntryLevel_L2] = this->GetL2EntryFromTable(GetPageTableVirtualAddress(out_context->level_entries[EntryLevel_L1]->GetTable()), address);
if (out_context->level_entries[EntryLevel_L2]->IsMappedTable()) {
/* Get the L3 entry. */
out_context->level_entries[EntryLevel_L3] = this->GetL3EntryFromTable(GetPageTableVirtualAddress(out_context->level_entries[EntryLevel_L2]->GetTable()), address);
/* Update the context for next traversal. */
switch (out_entry->block_size) {
case L1ContiguousBlockSize:
out_context->l1_entry += (L1ContiguousBlockSize / L1BlockSize) - GetContiguousL1Offset(address) / L1BlockSize;
break;
case L1BlockSize:
out_context->l1_entry += 1;
break;
case L2ContiguousBlockSize:
out_context->l1_entry += 1;
out_context->l2_entry += (L2ContiguousBlockSize / L2BlockSize) - GetContiguousL2Offset(address) / L2BlockSize;
break;
case L2BlockSize:
out_context->l1_entry += 1;
out_context->l2_entry += 1;
break;
case L3ContiguousBlockSize:
out_context->l1_entry += 1;
out_context->l2_entry += 1;
out_context->l3_entry += (L3ContiguousBlockSize / L3BlockSize) - GetContiguousL3Offset(address) / L3BlockSize;
break;
case L3BlockSize:
out_context->l1_entry += 1;
out_context->l2_entry += 1;
out_context->l3_entry += 1;
break;
MESOSPHERE_UNREACHABLE_DEFAULT_CASE();
/* It's either a page or not. */
out_context->level = EntryLevel_L3;
} else {
/* Not a L2 table, so possibly an L2 block. */
out_context->level = EntryLevel_L2;
}
} else {
/* Not a L1 table, so possibly an L1 block. */
out_context->level = EntryLevel_L1;
}
return valid;
/* Determine other fields. */
const auto *pte = out_context->level_entries[out_context->level];
out_context->is_contiguous = pte->IsContiguous();
out_entry->sw_reserved_bits = pte->GetSoftwareReservedBits();
out_entry->attr = 0;
out_entry->phys_addr = this->GetBlock(pte, out_context->level) + this->GetOffset(address, out_context->level);
out_entry->block_size = static_cast<size_t>(1) << (PageBits + LevelBits * out_context->level + 4 * out_context->is_contiguous);
return out_context->level == EntryLevel_L3 ? pte->IsPage() : pte->IsBlock();
}
bool KPageTableImpl::ContinueTraversal(TraversalEntry *out_entry, TraversalContext *context) const {
bool valid = false;
/* Advance entry. */
/* Check if we're not at the end of an L3 table. */
if (!util::IsAligned(reinterpret_cast<uintptr_t>(context->l3_entry), PageSize)) {
valid = this->ExtractL3Entry(out_entry, context, context->l3_entry, Null<KProcessAddress>);
auto *cur_pte = context->level_entries[context->level];
auto *next_pte = reinterpret_cast<PageTableEntry *>(context->is_contiguous ? util::AlignDown(reinterpret_cast<uintptr_t>(cur_pte), 0x10 * sizeof(PageTableEntry)) + 0x10 * sizeof(PageTableEntry) : reinterpret_cast<uintptr_t>(cur_pte) + sizeof(PageTableEntry));
switch (out_entry->block_size) {
case L3ContiguousBlockSize:
context->l3_entry += (L3ContiguousBlockSize / L3BlockSize);
break;
case L3BlockSize:
context->l3_entry += 1;
break;
MESOSPHERE_UNREACHABLE_DEFAULT_CASE();
}
} else if (!util::IsAligned(reinterpret_cast<uintptr_t>(context->l2_entry), PageSize)) {
/* We're not at the end of an L2 table. */
valid = this->ExtractL2Entry(out_entry, context, context->l2_entry, Null<KProcessAddress>);
/* Set the pte. */
context->level_entries[context->level] = next_pte;
switch (out_entry->block_size) {
case L2ContiguousBlockSize:
context->l2_entry += (L2ContiguousBlockSize / L2BlockSize);
break;
case L2BlockSize:
context->l2_entry += 1;
break;
case L3ContiguousBlockSize:
context->l2_entry += 1;
context->l3_entry += (L3ContiguousBlockSize / L3BlockSize);
break;
case L3BlockSize:
context->l2_entry += 1;
context->l3_entry += 1;
break;
MESOSPHERE_UNREACHABLE_DEFAULT_CASE();
}
} else {
/* We need to update the l1 entry. */
const size_t l1_index = context->l1_entry - m_table;
if (l1_index < m_num_entries) {
valid = this->ExtractL1Entry(out_entry, context, context->l1_entry, Null<KProcessAddress>);
} else {
/* Invalid, end traversal. */
out_entry->phys_addr = Null<KPhysicalAddress>;
out_entry->block_size = L1BlockSize;
out_entry->sw_reserved_bits = 0;
out_entry->attr = 0;
context->l1_entry = m_table + m_num_entries;
context->l2_entry = nullptr;
context->l3_entry = nullptr;
/* Advance appropriately. */
while (context->level < EntryLevel_L1 && util::IsAligned(reinterpret_cast<uintptr_t>(context->level_entries[context->level]), PageSize)) {
/* Advance the above table by one entry. */
context->level_entries[context->level + 1]++;
context->level = static_cast<EntryLevel>(util::ToUnderlying(context->level) + 1);
}
/* Check if we've hit the end of the L1 table. */
if (context->level == EntryLevel_L1) {
if (context->level_entries[EntryLevel_L1] - static_cast<const PageTableEntry *>(m_table) >= m_num_entries) {
*context = {};
*out_entry = {};
return false;
}
switch (out_entry->block_size) {
case L1ContiguousBlockSize:
context->l1_entry += (L1ContiguousBlockSize / L1BlockSize);
break;
case L1BlockSize:
context->l1_entry += 1;
break;
case L2ContiguousBlockSize:
context->l1_entry += 1;
context->l2_entry += (L2ContiguousBlockSize / L2BlockSize);
break;
case L2BlockSize:
context->l1_entry += 1;
context->l2_entry += 1;
break;
case L3ContiguousBlockSize:
context->l1_entry += 1;
context->l2_entry += 1;
context->l3_entry += (L3ContiguousBlockSize / L3BlockSize);
break;
case L3BlockSize:
context->l1_entry += 1;
context->l2_entry += 1;
context->l3_entry += 1;
break;
MESOSPHERE_UNREACHABLE_DEFAULT_CASE();
}
}
return valid;
/* We may have advanced to a new table, and if we have we should descend. */
while (context->level > EntryLevel_L3 && context->level_entries[context->level]->IsMappedTable()) {
context->level_entries[context->level - 1] = GetPointer<PageTableEntry>(GetPageTableVirtualAddress(context->level_entries[context->level]->GetTable()));
context->level = static_cast<EntryLevel>(util::ToUnderlying(context->level) - 1);
}
const auto *pte = context->level_entries[context->level];
context->is_contiguous = pte->IsContiguous();
out_entry->sw_reserved_bits = pte->GetSoftwareReservedBits();
out_entry->attr = 0;
out_entry->phys_addr = this->GetBlock(pte, context->level);
out_entry->block_size = static_cast<size_t>(1) << (PageBits + LevelBits * context->level + 4 * context->is_contiguous);
return context->level == EntryLevel_L3 ? pte->IsPage() : pte->IsBlock();
}
bool KPageTableImpl::GetPhysicalAddress(KPhysicalAddress *out, KProcessAddress address) const {
@ -283,32 +232,27 @@ namespace ams::kern::arch::arm64 {
}
}
/* Try to get from l1 table. */
const L1PageTableEntry *l1_entry = this->GetL1Entry(address);
if (l1_entry->IsBlock()) {
*out = l1_entry->GetBlock() + GetL1Offset(address);
return true;
} else if (!l1_entry->IsTable()) {
return false;
/* Get the L1 entry, and check if it's a table. */
const PageTableEntry *pte = this->GetL1Entry(address);
EntryLevel level = EntryLevel_L1;
if (pte->IsMappedTable()) {
/* Get the L2 entry, and check if it's a table. */
pte = this->GetL2EntryFromTable(GetPageTableVirtualAddress(pte->GetTable()), address);
level = EntryLevel_L2;
if (pte->IsMappedTable()) {
pte = this->GetL3EntryFromTable(GetPageTableVirtualAddress(pte->GetTable()), address);
level = EntryLevel_L3;
}
}
/* Try to get from l2 table. */
const L2PageTableEntry *l2_entry = this->GetL2Entry(l1_entry, address);
if (l2_entry->IsBlock()) {
*out = l2_entry->GetBlock() + GetL2Offset(address);
return true;
} else if (!l2_entry->IsTable()) {
return false;
const bool is_block = level == EntryLevel_L3 ? pte->IsPage() : pte->IsBlock();
if (is_block) {
*out = this->GetBlock(pte, level) + this->GetOffset(address, level);
} else {
*out = Null<KPhysicalAddress>;
}
/* Try to get from l3 table. */
const L3PageTableEntry *l3_entry = this->GetL3Entry(l2_entry, address);
if (l3_entry->IsBlock()) {
*out = l3_entry->GetBlock() + GetL3Offset(address);
return true;
}
return false;
return is_block;
}
void KPageTableImpl::Dump(uintptr_t start, size_t size) const {