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kern: Perform page table validity pass during KPageTableImpl::InitializeForKernel

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This commit is contained in:
Michael Scire 2024-10-10 19:14:07 -07:00 committed by SciresM
parent c911420d6a
commit e63cae5c77
4 changed files with 127 additions and 69 deletions
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104
libraries/libmesosphere/include/mesosphere/arch/arm64/init/kern_k_init_page_table.hpp
View file

@ -110,47 +110,47 @@ namespace ams::kern::arch::arm64::init {
L1PageTableEntry *l1_entry = this->GetL1Entry(virt_addr);
/* If an L1 block is mapped or we're empty, advance by L1BlockSize. */
if (l1_entry->IsBlock() || l1_entry->IsEmpty()) {
if (l1_entry->IsMappedBlock() || l1_entry->IsEmpty()) {
MESOSPHERE_INIT_ABORT_UNLESS(util::IsAligned(GetInteger(virt_addr), L1BlockSize));
MESOSPHERE_INIT_ABORT_UNLESS(static_cast<size_t>(end_virt_addr - virt_addr) >= L1BlockSize);
virt_addr += L1BlockSize;
if (l1_entry->IsBlock() && block_size == L1BlockSize) {
if (l1_entry->IsMappedBlock() && block_size == L1BlockSize) {
count++;
}
continue;
}
/* Non empty and non-block must be table. */
MESOSPHERE_INIT_ABORT_UNLESS(l1_entry->IsTable());
MESOSPHERE_INIT_ABORT_UNLESS(l1_entry->IsMappedTable());
/* Table, so check if we're mapped in L2. */
L2PageTableEntry *l2_entry = GetL2Entry(l1_entry, virt_addr);
if (l2_entry->IsBlock() || l2_entry->IsEmpty()) {
const size_t advance_size = (l2_entry->IsBlock() && l2_entry->IsContiguous()) ? L2ContiguousBlockSize : L2BlockSize;
if (l2_entry->IsMappedBlock() || l2_entry->IsEmpty()) {
const size_t advance_size = (l2_entry->IsMappedBlock() && l2_entry->IsContiguous()) ? L2ContiguousBlockSize : L2BlockSize;
MESOSPHERE_INIT_ABORT_UNLESS(util::IsAligned(GetInteger(virt_addr), advance_size));
MESOSPHERE_INIT_ABORT_UNLESS(static_cast<size_t>(end_virt_addr - virt_addr) >= advance_size);
virt_addr += advance_size;
if (l2_entry->IsBlock() && block_size == advance_size) {
if (l2_entry->IsMappedBlock() && block_size == advance_size) {
count++;
}
continue;
}
/* Non empty and non-block must be table. */
MESOSPHERE_INIT_ABORT_UNLESS(l2_entry->IsTable());
MESOSPHERE_INIT_ABORT_UNLESS(l2_entry->IsMappedTable());
/* Table, so check if we're mapped in L3. */
L3PageTableEntry *l3_entry = GetL3Entry(l2_entry, virt_addr);
/* L3 must be block or empty. */
MESOSPHERE_INIT_ABORT_UNLESS(l3_entry->IsBlock() || l3_entry->IsEmpty());
MESOSPHERE_INIT_ABORT_UNLESS(l3_entry->IsMappedBlock() || l3_entry->IsEmpty());
const size_t advance_size = (l3_entry->IsBlock() && l3_entry->IsContiguous()) ? L3ContiguousBlockSize : L3BlockSize;
const size_t advance_size = (l3_entry->IsMappedBlock() && l3_entry->IsContiguous()) ? L3ContiguousBlockSize : L3BlockSize;
MESOSPHERE_INIT_ABORT_UNLESS(util::IsAligned(GetInteger(virt_addr), advance_size));
MESOSPHERE_INIT_ABORT_UNLESS(static_cast<size_t>(end_virt_addr - virt_addr) >= advance_size);
virt_addr += advance_size;
if (l3_entry->IsBlock() && block_size == advance_size) {
if (l3_entry->IsMappedBlock() && block_size == advance_size) {
count++;
}
}
@ -164,10 +164,10 @@ namespace ams::kern::arch::arm64::init {
L1PageTableEntry *l1_entry = this->GetL1Entry(virt_addr);
/* If an L1 block is mapped or we're empty, advance by L1BlockSize. */
if (l1_entry->IsBlock() || l1_entry->IsEmpty()) {
if (l1_entry->IsMappedBlock() || l1_entry->IsEmpty()) {
MESOSPHERE_INIT_ABORT_UNLESS(util::IsAligned(GetInteger(virt_addr), L1BlockSize));
MESOSPHERE_INIT_ABORT_UNLESS(static_cast<size_t>(end_virt_addr - virt_addr) >= L1BlockSize);
if (l1_entry->IsBlock() && block_size == L1BlockSize) {
if (l1_entry->IsMappedBlock() && block_size == L1BlockSize) {
if ((count++) == index) {
return virt_addr;
}
@ -177,16 +177,16 @@ namespace ams::kern::arch::arm64::init {
}
/* Non empty and non-block must be table. */
MESOSPHERE_INIT_ABORT_UNLESS(l1_entry->IsTable());
MESOSPHERE_INIT_ABORT_UNLESS(l1_entry->IsMappedTable());
/* Table, so check if we're mapped in L2. */
L2PageTableEntry *l2_entry = GetL2Entry(l1_entry, virt_addr);
if (l2_entry->IsBlock() || l2_entry->IsEmpty()) {
const size_t advance_size = (l2_entry->IsBlock() && l2_entry->IsContiguous()) ? L2ContiguousBlockSize : L2BlockSize;
if (l2_entry->IsMappedBlock() || l2_entry->IsEmpty()) {
const size_t advance_size = (l2_entry->IsMappedBlock() && l2_entry->IsContiguous()) ? L2ContiguousBlockSize : L2BlockSize;
MESOSPHERE_INIT_ABORT_UNLESS(util::IsAligned(GetInteger(virt_addr), advance_size));
MESOSPHERE_INIT_ABORT_UNLESS(static_cast<size_t>(end_virt_addr - virt_addr) >= advance_size);
if (l2_entry->IsBlock() && block_size == advance_size) {
if (l2_entry->IsMappedBlock() && block_size == advance_size) {
if ((count++) == index) {
return virt_addr;
}
@ -196,18 +196,18 @@ namespace ams::kern::arch::arm64::init {
}
/* Non empty and non-block must be table. */
MESOSPHERE_INIT_ABORT_UNLESS(l2_entry->IsTable());
MESOSPHERE_INIT_ABORT_UNLESS(l2_entry->IsMappedTable());
/* Table, so check if we're mapped in L3. */
L3PageTableEntry *l3_entry = GetL3Entry(l2_entry, virt_addr);
/* L3 must be block or empty. */
MESOSPHERE_INIT_ABORT_UNLESS(l3_entry->IsBlock() || l3_entry->IsEmpty());
MESOSPHERE_INIT_ABORT_UNLESS(l3_entry->IsMappedBlock() || l3_entry->IsEmpty());
const size_t advance_size = (l3_entry->IsBlock() && l3_entry->IsContiguous()) ? L3ContiguousBlockSize : L3BlockSize;
const size_t advance_size = (l3_entry->IsMappedBlock() && l3_entry->IsContiguous()) ? L3ContiguousBlockSize : L3BlockSize;
MESOSPHERE_INIT_ABORT_UNLESS(util::IsAligned(GetInteger(virt_addr), advance_size));
MESOSPHERE_INIT_ABORT_UNLESS(static_cast<size_t>(end_virt_addr - virt_addr) >= advance_size);
if (l3_entry->IsBlock() && block_size == advance_size) {
if (l3_entry->IsMappedBlock() && block_size == advance_size) {
if ((count++) == index) {
return virt_addr;
}
@ -220,29 +220,29 @@ namespace ams::kern::arch::arm64::init {
PageTableEntry *GetMappingEntry(KVirtualAddress virt_addr, size_t block_size) {
L1PageTableEntry *l1_entry = this->GetL1Entry(virt_addr);
if (l1_entry->IsBlock()) {
if (l1_entry->IsMappedBlock()) {
MESOSPHERE_INIT_ABORT_UNLESS(block_size == L1BlockSize);
return l1_entry;
}
MESOSPHERE_INIT_ABORT_UNLESS(l1_entry->IsTable());
MESOSPHERE_INIT_ABORT_UNLESS(l1_entry->IsMappedTable());
/* Table, so check if we're mapped in L2. */
L2PageTableEntry *l2_entry = GetL2Entry(l1_entry, virt_addr);
if (l2_entry->IsBlock()) {
if (l2_entry->IsMappedBlock()) {
const size_t real_size = (l2_entry->IsContiguous()) ? L2ContiguousBlockSize : L2BlockSize;
MESOSPHERE_INIT_ABORT_UNLESS(real_size == block_size);
return l2_entry;
}
MESOSPHERE_INIT_ABORT_UNLESS(l2_entry->IsTable());
MESOSPHERE_INIT_ABORT_UNLESS(l2_entry->IsMappedTable());
/* Table, so check if we're mapped in L3. */
L3PageTableEntry *l3_entry = GetL3Entry(l2_entry, virt_addr);
/* L3 must be block. */
MESOSPHERE_INIT_ABORT_UNLESS(l3_entry->IsBlock());
MESOSPHERE_INIT_ABORT_UNLESS(l3_entry->IsMappedBlock());
const size_t real_size = (l3_entry->IsContiguous()) ? L3ContiguousBlockSize : L3BlockSize;
MESOSPHERE_INIT_ABORT_UNLESS(real_size == block_size);
@ -340,7 +340,7 @@ namespace ams::kern::arch::arm64::init {
}
/* If we don't already have an L2 table, we need to make a new one. */
if (!l1_entry->IsTable()) {
if (!l1_entry->IsMappedTable()) {
KPhysicalAddress new_table = AllocateNewPageTable(allocator, phys_to_virt_offset);
cpu::DataSynchronizationBarrierInnerShareable();
*l1_entry = L1PageTableEntry(PageTableEntry::TableTag{}, new_table, attr.IsPrivilegedExecuteNever());
@ -371,7 +371,7 @@ namespace ams::kern::arch::arm64::init {
}
/* If we don't already have an L3 table, we need to make a new one. */
if (!l2_entry->IsTable()) {
if (!l2_entry->IsMappedTable()) {
KPhysicalAddress new_table = AllocateNewPageTable(allocator, phys_to_virt_offset);
cpu::DataSynchronizationBarrierInnerShareable();
*l2_entry = L2PageTableEntry(PageTableEntry::TableTag{}, new_table, attr.IsPrivilegedExecuteNever());
@ -416,12 +416,12 @@ namespace ams::kern::arch::arm64::init {
for (size_t l1_index = 0; l1_index < m_num_entries[0]; l1_index++) {
/* Get L1 entry. */
L1PageTableEntry * const l1_entry = l1_table + l1_index;
if (l1_entry->IsBlock()) {
if (l1_entry->IsMappedBlock()) {
/* Unmap the L1 entry, if we should. */
if (ShouldUnmap(l1_entry)) {
*static_cast<PageTableEntry *>(l1_entry) = InvalidPageTableEntry;
}
} else if (l1_entry->IsTable()) {
} else if (l1_entry->IsMappedTable()) {
/* Get the L2 table. */
L2PageTableEntry * const l2_table = reinterpret_cast<L2PageTableEntry *>(GetInteger(l1_entry->GetTable()) + phys_to_virt_offset);
@ -430,7 +430,7 @@ namespace ams::kern::arch::arm64::init {
for (size_t l2_index = 0; l2_index < MaxPageTableEntries; ++l2_index) {
/* Get L2 entry. */
L2PageTableEntry * const l2_entry = l2_table + l2_index;
if (l2_entry->IsBlock()) {
if (l2_entry->IsMappedBlock()) {
const size_t num_to_clear = (l2_entry->IsContiguous() ? L2ContiguousBlockSize : L2BlockSize) / L2BlockSize;
if (ShouldUnmap(l2_entry)) {
@ -442,7 +442,7 @@ namespace ams::kern::arch::arm64::init {
}
l2_index = l2_index + num_to_clear - 1;
} else if (l2_entry->IsTable()) {
} else if (l2_entry->IsMappedTable()) {
/* Get the L3 table. */
L3PageTableEntry * const l3_table = reinterpret_cast<L3PageTableEntry *>(GetInteger(l2_entry->GetTable()) + phys_to_virt_offset);
@ -450,7 +450,7 @@ namespace ams::kern::arch::arm64::init {
size_t remaining_l3_entries = 0;
for (size_t l3_index = 0; l3_index < MaxPageTableEntries; ++l3_index) {
/* Get L3 entry. */
if (L3PageTableEntry * const l3_entry = l3_table + l3_index; l3_entry->IsBlock()) {
if (L3PageTableEntry * const l3_entry = l3_table + l3_index; l3_entry->IsMappedBlock()) {
const size_t num_to_clear = (l3_entry->IsContiguous() ? L3ContiguousBlockSize : L3BlockSize) / L3BlockSize;
if (ShouldUnmap(l3_entry)) {
@ -498,25 +498,25 @@ namespace ams::kern::arch::arm64::init {
/* Get the L1 entry. */
const L1PageTableEntry *l1_entry = this->GetL1Entry(virt_addr);
if (l1_entry->IsBlock()) {
if (l1_entry->IsMappedBlock()) {
return l1_entry->GetBlock() + (GetInteger(virt_addr) & (L1BlockSize - 1));
}
MESOSPHERE_INIT_ABORT_UNLESS(l1_entry->IsTable());
MESOSPHERE_INIT_ABORT_UNLESS(l1_entry->IsMappedTable());
/* Get the L2 entry. */
const L2PageTableEntry *l2_entry = GetL2Entry(l1_entry, virt_addr);
if (l2_entry->IsBlock()) {
if (l2_entry->IsMappedBlock()) {
return l2_entry->GetBlock() + (GetInteger(virt_addr) & (L2BlockSize - 1));
}
MESOSPHERE_INIT_ABORT_UNLESS(l2_entry->IsTable());
MESOSPHERE_INIT_ABORT_UNLESS(l2_entry->IsMappedTable());
/* Get the L3 entry. */
const L3PageTableEntry *l3_entry = GetL3Entry(l2_entry, virt_addr);
MESOSPHERE_INIT_ABORT_UNLESS(l3_entry->IsBlock());
MESOSPHERE_INIT_ABORT_UNLESS(l3_entry->IsMappedBlock());
return l3_entry->GetBlock() + (GetInteger(virt_addr) & (L3BlockSize - 1));
}
@ -561,26 +561,26 @@ namespace ams::kern::arch::arm64::init {
L1PageTableEntry *l1_entry = this->GetL1Entry(virt_addr);
/* If an L1 block is mapped, update. */
if (l1_entry->IsBlock()) {
if (l1_entry->IsMappedBlock()) {
UpdateExtents(l1_entry->GetBlock(), L1BlockSize);
continue;
}
/* Not a block, so we must have a table. */
MESOSPHERE_INIT_ABORT_UNLESS(l1_entry->IsTable());
MESOSPHERE_INIT_ABORT_UNLESS(l1_entry->IsMappedTable());
L2PageTableEntry *l2_entry = GetL2Entry(l1_entry, virt_addr);
if (l2_entry->IsBlock()) {
if (l2_entry->IsMappedBlock()) {
UpdateExtents(l2_entry->GetBlock(), l2_entry->IsContiguous() ? L2ContiguousBlockSize : L2BlockSize);
continue;
}
/* Not a block, so we must have a table. */
MESOSPHERE_INIT_ABORT_UNLESS(l2_entry->IsTable());
MESOSPHERE_INIT_ABORT_UNLESS(l2_entry->IsMappedTable());
/* We must have a mapped l3 entry to inspect. */
L3PageTableEntry *l3_entry = GetL3Entry(l2_entry, virt_addr);
MESOSPHERE_INIT_ABORT_UNLESS(l3_entry->IsBlock());
MESOSPHERE_INIT_ABORT_UNLESS(l3_entry->IsMappedBlock());
UpdateExtents(l3_entry->GetBlock(), l3_entry->IsContiguous() ? L3ContiguousBlockSize : L3BlockSize);
}
@ -602,11 +602,11 @@ namespace ams::kern::arch::arm64::init {
L1PageTableEntry *l1_entry = this->GetL1Entry(virt_addr);
/* If an L1 block is mapped, the address isn't free. */
if (l1_entry->IsBlock()) {
if (l1_entry->IsMappedBlock()) {
return false;
}
if (!l1_entry->IsTable()) {
if (!l1_entry->IsMappedTable()) {
/* Not a table, so just move to check the next region. */
virt_addr = util::AlignDown(GetInteger(virt_addr) + L1BlockSize, L1BlockSize);
continue;
@ -615,11 +615,11 @@ namespace ams::kern::arch::arm64::init {
/* Table, so check if we're mapped in L2. */
L2PageTableEntry *l2_entry = GetL2Entry(l1_entry, virt_addr);
if (l2_entry->IsBlock()) {
if (l2_entry->IsMappedBlock()) {
return false;
}
if (!l2_entry->IsTable()) {
if (!l2_entry->IsMappedTable()) {
/* Not a table, so just move to check the next region. */
virt_addr = util::AlignDown(GetInteger(virt_addr) + L2BlockSize, L2BlockSize);
continue;
@ -628,7 +628,7 @@ namespace ams::kern::arch::arm64::init {
/* Table, so check if we're mapped in L3. */
L3PageTableEntry *l3_entry = GetL3Entry(l2_entry, virt_addr);
if (l3_entry->IsBlock()) {
if (l3_entry->IsMappedBlock()) {
return false;
}
@ -648,7 +648,7 @@ namespace ams::kern::arch::arm64::init {
L1PageTableEntry *l1_entry = this->GetL1Entry(virt_addr);
/* Check if an L1 block is present. */
if (l1_entry->IsBlock()) {
if (l1_entry->IsMappedBlock()) {
/* Ensure that we are allowed to have an L1 block here. */
const KPhysicalAddress block = l1_entry->GetBlock();
MESOSPHERE_INIT_ABORT_UNLESS(util::IsAligned(GetInteger(virt_addr), L1BlockSize));
@ -669,10 +669,10 @@ namespace ams::kern::arch::arm64::init {
}
/* Not a block, so we must be a table. */
MESOSPHERE_INIT_ABORT_UNLESS(l1_entry->IsTable());
MESOSPHERE_INIT_ABORT_UNLESS(l1_entry->IsMappedTable());
L2PageTableEntry *l2_entry = GetL2Entry(l1_entry, virt_addr);
if (l2_entry->IsBlock()) {
if (l2_entry->IsMappedBlock()) {
const KPhysicalAddress block = l2_entry->GetBlock();
if (l2_entry->IsContiguous()) {
@ -720,11 +720,11 @@ namespace ams::kern::arch::arm64::init {
}
/* Not a block, so we must be a table. */
MESOSPHERE_INIT_ABORT_UNLESS(l2_entry->IsTable());
MESOSPHERE_INIT_ABORT_UNLESS(l2_entry->IsMappedTable());
/* We must have a mapped l3 entry to reprotect. */
L3PageTableEntry *l3_entry = GetL3Entry(l2_entry, virt_addr);
MESOSPHERE_INIT_ABORT_UNLESS(l3_entry->IsBlock());
MESOSPHERE_INIT_ABORT_UNLESS(l3_entry->IsMappedBlock());
const KPhysicalAddress block = l3_entry->GetBlock();
if (l3_entry->IsContiguous()) {

22
libraries/libmesosphere/include/mesosphere/arch/arm64/kern_k_page_table_entry.hpp
View file

@ -128,8 +128,8 @@ namespace ams::kern::arch::arm64 {
}
/* Construct a table. */
constexpr explicit ALWAYS_INLINE PageTableEntry(TableTag, KPhysicalAddress phys_addr, bool is_kernel, bool pxn, size_t num_blocks)
: PageTableEntry(((is_kernel ? 0x3ul : 0) << 60) | (static_cast<u64>(pxn) << 59) | GetInteger(phys_addr) | (num_blocks << 2) | 0x3)
constexpr explicit ALWAYS_INLINE PageTableEntry(TableTag, KPhysicalAddress phys_addr, bool is_kernel, bool pxn, size_t ref_count)
: PageTableEntry(((is_kernel ? 0x3ul : 0) << 60) | (static_cast<u64>(pxn) << 59) | GetInteger(phys_addr) | (ref_count << 2) | 0x3)
{
/* ... */
}
@ -203,6 +203,7 @@ namespace ams::kern::arch::arm64 {
constexpr ALWAYS_INLINE KPhysicalAddress GetTable() const { return this->SelectBits(12, 36); }
constexpr ALWAYS_INLINE bool IsMappedBlock() const { return this->GetBits(0, 2) == 1; }
constexpr ALWAYS_INLINE bool IsMappedTable() const { return this->GetBits(0, 2) == 3; }
constexpr ALWAYS_INLINE bool IsMapped() const { return this->GetBits(0, 1) != 0; }
@ -217,11 +218,13 @@ namespace ams::kern::arch::arm64 {
constexpr ALWAYS_INLINE decltype(auto) SetPageAttribute(PageAttribute a) { this->SetBitsDirect(2, 3, a); return *this; }
constexpr ALWAYS_INLINE decltype(auto) SetMapped(bool m) { static_assert(static_cast<u64>(MappingFlag_Mapped == (1 << 0))); this->SetBit(0, m); return *this; }
constexpr ALWAYS_INLINE size_t GetTableNumEntries() const { return this->GetBits(2, 10); }
constexpr ALWAYS_INLINE decltype(auto) SetTableNumEntries(size_t num) { this->SetBits(2, 10, num); }
constexpr ALWAYS_INLINE size_t GetTableReferenceCount() const { return this->GetBits(2, 10); }
constexpr ALWAYS_INLINE decltype(auto) SetTableReferenceCount(size_t num) { this->SetBits(2, 10, num); return *this; }
constexpr ALWAYS_INLINE decltype(auto) AddTableEntries(size_t num) { return this->SetTableNumEntries(this->GetTableNumEntries() + num); }
constexpr ALWAYS_INLINE decltype(auto) RemoveTableEntries(size_t num) { return this->SetTableNumEntries(this->GetTableNumEntries() - num); }
constexpr ALWAYS_INLINE decltype(auto) OpenTableReferences(size_t num) { MESOSPHERE_ASSERT(this->GetTableReferenceCount() + num <= BlocksPerTable + 1); return this->SetTableReferenceCount(this->GetTableReferenceCount() + num); }
constexpr ALWAYS_INLINE decltype(auto) CloseTableReferences(size_t num) { MESOSPHERE_ASSERT(this->GetTableReferenceCount() >= num); return this->SetTableReferenceCount(this->GetTableReferenceCount() - num); }
constexpr ALWAYS_INLINE decltype(auto) SetValid() { MESOSPHERE_ASSERT((m_attributes & ExtensionFlag_Valid) == 0); m_attributes |= ExtensionFlag_Valid; return *this; }
constexpr ALWAYS_INLINE u64 GetEntryTemplateForMerge() const {
constexpr u64 BaseMask = (0xFFFF000000000FFFul & ~static_cast<u64>((0x1ul << 52) | ExtensionFlag_TestTableMask | ExtensionFlag_DisableMergeHead | ExtensionFlag_DisableMergeHeadAndBody | ExtensionFlag_DisableMergeTail));
@ -301,7 +304,7 @@ namespace ams::kern::arch::arm64 {
}
constexpr explicit ALWAYS_INLINE L1PageTableEntry(BlockTag, KPhysicalAddress phys_addr, const PageTableEntry &attr, u8 sw_reserved_bits, bool contig)
: PageTableEntry(attr, (static_cast<u64>(sw_reserved_bits) << 55) | (static_cast<u64>(contig) << 52) | GetInteger(phys_addr) | PageTableEntry::ExtensionFlag_Valid)
: PageTableEntry(attr, (static_cast<u64>(sw_reserved_bits) << 55) | (static_cast<u64>(contig) << 52) | GetInteger(phys_addr) | 0x1)
{
/* ... */
}
@ -363,7 +366,7 @@ namespace ams::kern::arch::arm64 {
}
constexpr explicit ALWAYS_INLINE L2PageTableEntry(BlockTag, KPhysicalAddress phys_addr, const PageTableEntry &attr, u8 sw_reserved_bits, bool contig)
: PageTableEntry(attr, (static_cast<u64>(sw_reserved_bits) << 55) | (static_cast<u64>(contig) << 52) | GetInteger(phys_addr) | PageTableEntry::ExtensionFlag_Valid)
: PageTableEntry(attr, (static_cast<u64>(sw_reserved_bits) << 55) | (static_cast<u64>(contig) << 52) | GetInteger(phys_addr) | 0x1)
{
/* ... */
}
@ -428,12 +431,13 @@ namespace ams::kern::arch::arm64 {
constexpr explicit ALWAYS_INLINE L3PageTableEntry(InvalidTag) : PageTableEntry(InvalidTag{}) { /* ... */ }
constexpr explicit ALWAYS_INLINE L3PageTableEntry(BlockTag, KPhysicalAddress phys_addr, const PageTableEntry &attr, u8 sw_reserved_bits, bool contig)
: PageTableEntry(attr, (static_cast<u64>(sw_reserved_bits) << 55) | (static_cast<u64>(contig) << 52) | GetInteger(phys_addr) | static_cast<u64>(ExtensionFlag_TestTableMask))
: PageTableEntry(attr, (static_cast<u64>(sw_reserved_bits) << 55) | (static_cast<u64>(contig) << 52) | GetInteger(phys_addr) | 0x3)
{
/* ... */
}
constexpr ALWAYS_INLINE bool IsBlock() const { return (GetRawAttributes() & ExtensionFlag_TestTableMask) == ExtensionFlag_TestTableMask; }
constexpr ALWAYS_INLINE bool IsMappedBlock() const { return this->GetBits(0, 2) == 3; }
constexpr ALWAYS_INLINE KPhysicalAddress GetBlock() const {
return this->SelectBits(12, 36);

16
libraries/libmesosphere/source/arch/arm64/kern_k_page_table.cpp
View file

@ -220,7 +220,7 @@ namespace ams::kern::arch::arm64 {
/* Remove the entries from the previous table. */
if (context.level != KPageTableImpl::EntryLevel_L1) {
context.level_entries[context.level + 1]->RemoveTableEntries(num_to_clear);
context.level_entries[context.level + 1]->CloseTableReferences(num_to_clear);
}
/* If we cleared a table, we need to note that we updated and free the table. */
@ -238,7 +238,7 @@ namespace ams::kern::arch::arm64 {
context.level_entries[context.level] = pte + num_to_clear - 1;
/* We may have removed the last entries in a table, in which case we can free and unmap the tables. */
if (context.level >= KPageTableImpl::EntryLevel_L1 || context.level_entries[context.level + 1]->GetTableNumEntries() != 0) {
if (context.level >= KPageTableImpl::EntryLevel_L1 || context.level_entries[context.level + 1]->GetTableReferenceCount() != 0) {
break;
}
@ -395,7 +395,7 @@ namespace ams::kern::arch::arm64 {
/* Remove the entries from the previous table. */
if (context.level != KPageTableImpl::EntryLevel_L1) {
context.level_entries[context.level + 1]->RemoveTableEntries(num_to_clear);
context.level_entries[context.level + 1]->CloseTableReferences(num_to_clear);
}
/* If we cleared a table, we need to note that we updated and free the table. */
@ -415,7 +415,7 @@ namespace ams::kern::arch::arm64 {
context.level_entries[context.level] = pte + num_to_clear - 1;
/* We may have removed the last entries in a table, in which case we can free and unmap the tables. */
if (context.level >= KPageTableImpl::EntryLevel_L1 || context.level_entries[context.level + 1]->GetTableNumEntries() != 0) {
if (context.level >= KPageTableImpl::EntryLevel_L1 || context.level_entries[context.level + 1]->GetTableReferenceCount() != 0) {
break;
}
@ -485,7 +485,7 @@ namespace ams::kern::arch::arm64 {
/* Remove entries for and free any tables. */
while (context.level < KPageTableImpl::EntryLevel_L1) {
/* If the higher-level table has entries, we don't need to do a free. */
if (context.level_entries[context.level + 1]->GetTableNumEntries() != 0) {
if (context.level_entries[context.level + 1]->GetTableReferenceCount() != 0) {
break;
}
@ -500,7 +500,7 @@ namespace ams::kern::arch::arm64 {
/* Remove the entry for the table one level higher. */
if (context.level + 1 < KPageTableImpl::EntryLevel_L1) {
context.level_entries[context.level + 2]->RemoveTableEntries(1);
context.level_entries[context.level + 2]->CloseTableReferences(1);
}
/* Advance our level. */
@ -527,7 +527,7 @@ namespace ams::kern::arch::arm64 {
/* Add the entry to the table containing this one. */
if (context.level != KPageTableImpl::EntryLevel_L1) {
context.level_entries[context.level + 1]->AddTableEntries(1);
context.level_entries[context.level + 1]->OpenTableReferences(1);
}
/* Decrease our level. */
@ -559,7 +559,7 @@ namespace ams::kern::arch::arm64 {
/* Add the entries to the table containing this one. */
if (context.level != KPageTableImpl::EntryLevel_L1) {
context.level_entries[context.level + 1]->AddTableEntries(num_ptes);
context.level_entries[context.level + 1]->OpenTableReferences(num_ptes);
}
/* Update our context. */

54
libraries/libmesosphere/source/arch/arm64/kern_k_page_table_impl.cpp
View file

@ -27,6 +27,60 @@ namespace ams::kern::arch::arm64 {
m_table = static_cast<L1PageTableEntry *>(tb);
m_is_kernel = false;
m_num_entries = util::AlignUp(end - start, L1BlockSize) / L1BlockSize;
/* Page table entries created by KInitialPageTable need to be iterated and modified to ensure KPageTable invariants. */
PageTableEntry *level_entries[EntryLevel_Count] = { nullptr, nullptr, m_table };
u32 level = EntryLevel_L1;
while (level != EntryLevel_L1 || (level_entries[EntryLevel_L1] - static_cast<PageTableEntry *>(m_table)) < m_num_entries) {
/* Get the pte; it must never have the validity-extension flag set. */
auto *pte = level_entries[level];
MESOSPHERE_ASSERT((pte->GetSoftwareReservedBits() & PageTableEntry::SoftwareReservedBit_Valid) == 0);
/* While we're a table, recurse, fixing up the reference counts. */
while (level > EntryLevel_L3 && pte->IsMappedTable()) {
/* Count how many references are in the table. */
auto *table = GetPointer<PageTableEntry>(GetPageTableVirtualAddress(pte->GetTable()));
size_t ref_count = 0;
for (size_t i = 0; i < BlocksPerTable; ++i) {
if (table[i].IsMapped()) {
++ref_count;
}
}
/* Set the reference count for our new page, adding one additional uncloseable reference; kernel pages must never be unreferenced. */
pte->SetTableReferenceCount(ref_count + 1).SetValid();
/* Iterate downwards. */
level -= 1;
level_entries[level] = table;
pte = level_entries[level];
/* Check that the entry isn't unexpected. */
MESOSPHERE_ASSERT((pte->GetSoftwareReservedBits() & PageTableEntry::SoftwareReservedBit_Valid) == 0);
}
/* We're dealing with some block. If it's mapped, set it valid. */
if (pte->IsMapped()) {
pte->SetValid();
}
/* Advance. */
while (true) {
/* Advance to the next entry at the current level. */
++level_entries[level];
if (!util::IsAligned(reinterpret_cast<uintptr_t>(++level_entries[level]), PageSize)) {
break;
}
/* If we're at the end of a level, advance upwards. */
level_entries[level++] = nullptr;
if (level > EntryLevel_L1) {
return;
}
}
}
}
L1PageTableEntry *KPageTableImpl::Finalize() {