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/*
* Copyright (c) Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <mesosphere.hpp>
namespace ams::kern::arch::arm64 {
void KPageTableImpl::InitializeForKernel(void *tb, KVirtualAddress start, KVirtualAddress end) {
m_table = static_cast<L1PageTableEntry *>(tb);
m_is_kernel = true;
m_num_entries = util::AlignUp(end - start, L1BlockSize) / L1BlockSize;
}
void KPageTableImpl::InitializeForProcess(void *tb, KVirtualAddress start, KVirtualAddress end) {
m_table = static_cast<L1PageTableEntry *>(tb);
m_is_kernel = false;
m_num_entries = util::AlignUp(end - start, L1BlockSize) / L1BlockSize;
}
L1PageTableEntry *KPageTableImpl::Finalize() {
return m_table;
}
bool KPageTableImpl::BeginTraversal(TraversalEntry *out_entry, TraversalContext *out_context, KProcessAddress address) const {
/* Setup invalid defaults. */
*out_entry = {};
*out_context = {};
/* Validate that we can read the actual entry. */
const size_t l0_index = GetL0Index(address);
const size_t l1_index = GetL1Index(address);
if (m_is_kernel) {
/* Kernel entries must be accessed via TTBR1. */
if ((l0_index != MaxPageTableEntries - 1) || (l1_index < MaxPageTableEntries - m_num_entries)) {
return false;
}
} else {
/* User entries must be accessed with TTBR0. */
if ((l0_index != 0) || l1_index >= m_num_entries) {
return false;
}
}
/* 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);
/* 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;
}
/* 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 {
/* Advance entry. */
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), BlocksPerContiguousBlock * sizeof(PageTableEntry)) + BlocksPerContiguousBlock * sizeof(PageTableEntry) : reinterpret_cast<uintptr_t>(cur_pte) + sizeof(PageTableEntry));
/* Set the pte. */
context->level_entries[context->level] = next_pte;
/* 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;
}
}
/* 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 {
/* Validate that we can read the actual entry. */
const size_t l0_index = GetL0Index(address);
const size_t l1_index = GetL1Index(address);
if (m_is_kernel) {
/* Kernel entries must be accessed via TTBR1. */
if ((l0_index != MaxPageTableEntries - 1) || (l1_index < MaxPageTableEntries - m_num_entries)) {
return false;
}
} else {
/* User entries must be accessed with TTBR0. */
if ((l0_index != 0) || l1_index >= m_num_entries) {
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;
}
}
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>;
}
return is_block;
}
bool KPageTableImpl::MergePages(KVirtualAddress *out, TraversalContext *context) {
/* We want to upgrade the pages by one step. */
if (context->is_contiguous) {
/* We can't merge an L1 table. */
if (context->level == EntryLevel_L1) {
return false;
}
/* We want to upgrade a contiguous mapping in a table to a block. */
PageTableEntry *pte = reinterpret_cast<PageTableEntry *>(util::AlignDown(reinterpret_cast<uintptr_t>(context->level_entries[context->level]), BlocksPerTable * sizeof(PageTableEntry)));
const KPhysicalAddress phys_addr = GetBlock(pte, context->level);
/* First, check that all entries are valid for us to merge. */
const u64 entry_template = pte->GetEntryTemplateForMerge();
for (size_t i = 0; i < BlocksPerTable; ++i) {
if (!pte[i].IsForMerge(entry_template | GetInteger(phys_addr + (i << (PageBits + LevelBits * context->level))) | PageTableEntry::ContigType_Contiguous | pte->GetTestTableMask())) {
return false;
}
if (i > 0 && pte[i].IsHeadOrHeadAndBodyMergeDisabled()) {
return false;
}
if (i < BlocksPerTable - 1 && pte[i].IsTailMergeDisabled()) {
return false;
}
}
/* The entries are valid for us to merge, so merge them. */
const auto *head_pte = pte;
const auto *tail_pte = pte + BlocksPerTable - 1;
const auto sw_reserved_bits = PageTableEntry::EncodeSoftwareReservedBits(head_pte->IsHeadMergeDisabled(), head_pte->IsHeadAndBodyMergeDisabled(), tail_pte->IsTailMergeDisabled());
*context->level_entries[context->level + 1] = PageTableEntry(PageTableEntry::BlockTag{}, phys_addr, PageTableEntry(entry_template), sw_reserved_bits, false, false);
/* Update our context. */
context->is_contiguous = false;
context->level = static_cast<EntryLevel>(util::ToUnderlying(context->level) + 1);
/* Set the output to the table we just freed. */
*out = KVirtualAddress(pte);
} else {
/* We want to upgrade a non-contiguous mapping to a contiguous mapping. */
PageTableEntry *pte = reinterpret_cast<PageTableEntry *>(util::AlignDown(reinterpret_cast<uintptr_t>(context->level_entries[context->level]), BlocksPerContiguousBlock * sizeof(PageTableEntry)));
const KPhysicalAddress phys_addr = GetBlock(pte, context->level);
/* First, check that all entries are valid for us to merge. */
const u64 entry_template = pte->GetEntryTemplateForMerge();
for (size_t i = 0; i < BlocksPerContiguousBlock; ++i) {
if (!pte[i].IsForMerge(entry_template | GetInteger(phys_addr + (i << (PageBits + LevelBits * context->level))) | pte->GetTestTableMask())) {
return false;
}
if (i > 0 && pte[i].IsHeadOrHeadAndBodyMergeDisabled()) {
return false;
}
if (i < BlocksPerContiguousBlock - 1 && pte[i].IsTailMergeDisabled()) {
return false;
}
}
/* The entries are valid for us to merge, so merge them. */
const auto *head_pte = pte;
const auto *tail_pte = pte + BlocksPerContiguousBlock - 1;
const auto sw_reserved_bits = PageTableEntry::EncodeSoftwareReservedBits(head_pte->IsHeadMergeDisabled(), head_pte->IsHeadAndBodyMergeDisabled(), tail_pte->IsTailMergeDisabled());
for (size_t i = 0; i < BlocksPerContiguousBlock; ++i) {
pte[i] = PageTableEntry(PageTableEntry::BlockTag{}, phys_addr + (i << (PageBits + LevelBits * context->level)), PageTableEntry(entry_template), sw_reserved_bits, true, context->level == EntryLevel_L3);
}
/* Update our context. */
context->level_entries[context->level] = pte;
context->is_contiguous = true;
}
return true;
}
void KPageTableImpl::SeparatePages(TraversalEntry *entry, TraversalContext *context, KProcessAddress address, PageTableEntry *pte) const {
/* We want to downgrade the pages by one step. */
if (context->is_contiguous) {
/* We want to downgrade a contiguous mapping to a non-contiguous mapping. */
pte = reinterpret_cast<PageTableEntry *>(util::AlignDown(reinterpret_cast<uintptr_t>(context->level_entries[context->level]), BlocksPerContiguousBlock * sizeof(PageTableEntry)));
auto * const first = pte;
const KPhysicalAddress block = this->GetBlock(first, context->level);
for (size_t i = 0; i < BlocksPerContiguousBlock; ++i) {
pte[i] = PageTableEntry(PageTableEntry::BlockTag{}, block + (i << (PageBits + LevelBits * context->level)), PageTableEntry(first->GetEntryTemplateForSeparateContiguous(i)), PageTableEntry::SeparateContiguousTag{});
}
context->is_contiguous = false;
context->level_entries[context->level] = pte + (this->GetLevelIndex(address, context->level) & (BlocksPerContiguousBlock - 1));
} else {
/* We want to downgrade a block into a table. */
auto * const first = context->level_entries[context->level];
const KPhysicalAddress block = this->GetBlock(first, context->level);
for (size_t i = 0; i < BlocksPerTable; ++i) {
pte[i] = PageTableEntry(PageTableEntry::BlockTag{}, block + (i << (PageBits + LevelBits * (context->level - 1))), PageTableEntry(first->GetEntryTemplateForSeparate(i)), PageTableEntry::SoftwareReservedBit_None, true, context->level - 1 == EntryLevel_L3);
}
context->is_contiguous = true;
context->level = static_cast<EntryLevel>(util::ToUnderlying(context->level) - 1);
/* Wait for pending stores to complete. */
cpu::DataSynchronizationBarrierInnerShareableStore();
/* Update the block entry to be a table entry. */
*context->level_entries[context->level + 1] = PageTableEntry(PageTableEntry::TableTag{}, KPageTable::GetPageTablePhysicalAddress(KVirtualAddress(pte)), m_is_kernel, true, BlocksPerTable);
context->level_entries[context->level] = pte + this->GetLevelIndex(address, context->level);
}
entry->sw_reserved_bits = 0;
entry->attr = 0;
entry->phys_addr = this->GetBlock(context->level_entries[context->level], context->level) + this->GetOffset(address, context->level);
entry->block_size = static_cast<size_t>(1) << (PageBits + LevelBits * context->level + 4 * context->is_contiguous);
}
void KPageTableImpl::Dump(uintptr_t start, size_t size) const {
/* If zero size, there's nothing to dump. */
if (size == 0) {
return;
}
/* Define extents. */
const uintptr_t end = start + size;
const uintptr_t last = end - 1;
/* Define tracking variables. */
bool unmapped = false;
uintptr_t unmapped_start = 0;
/* Walk the table. */
uintptr_t cur = start;
while (cur < end) {
/* Validate that we can read the actual entry. */
const size_t l0_index = GetL0Index(cur);
const size_t l1_index = GetL1Index(cur);
if (m_is_kernel) {
/* Kernel entries must be accessed via TTBR1. */
if ((l0_index != MaxPageTableEntries - 1) || (l1_index < MaxPageTableEntries - m_num_entries)) {
return;
}
} else {
/* User entries must be accessed with TTBR0. */
if ((l0_index != 0) || l1_index >= m_num_entries) {
return;
}
}
/* Try to get from l1 table. */
const L1PageTableEntry *l1_entry = this->GetL1Entry(cur);
if (l1_entry->IsBlock()) {
/* Update. */
cur = util::AlignDown(cur, L1BlockSize);
if (unmapped) {
unmapped = false;
MESOSPHERE_RELEASE_LOG("%016lx - %016lx: not mapped\n", unmapped_start, cur - 1);
}
/* Print. */
MESOSPHERE_RELEASE_LOG("%016lx: %016lx PA=%p SZ=1G Mapped=%d UXN=%d PXN=%d Cont=%d nG=%d AF=%d SH=%x RO=%d UA=%d NS=%d AttrIndx=%d NoMerge=%d,%d,%d\n", cur,
*reinterpret_cast<const u64 *>(l1_entry),
reinterpret_cast<void *>(GetInteger(l1_entry->GetBlock())),
l1_entry->IsMapped(),
l1_entry->IsUserExecuteNever(),
l1_entry->IsPrivilegedExecuteNever(),
l1_entry->IsContiguous(),
!l1_entry->IsGlobal(),
static_cast<int>(l1_entry->GetAccessFlagInteger()),
static_cast<unsigned int>(l1_entry->GetShareableInteger()),
l1_entry->IsReadOnly(),
l1_entry->IsUserAccessible(),
l1_entry->IsNonSecure(),
static_cast<int>(l1_entry->GetPageAttributeInteger()),
l1_entry->IsHeadMergeDisabled(),
l1_entry->IsHeadAndBodyMergeDisabled(),
l1_entry->IsTailMergeDisabled());
/* Advance. */
cur += L1BlockSize;
continue;
} else if (!l1_entry->IsTable()) {
/* Update. */
cur = util::AlignDown(cur, L1BlockSize);
if (!unmapped) {
unmapped_start = cur;
unmapped = true;
}
/* Advance. */
cur += L1BlockSize;
continue;
}
/* Try to get from l2 table. */
const L2PageTableEntry *l2_entry = this->GetL2Entry(l1_entry, cur);
if (l2_entry->IsBlock()) {
/* Update. */
cur = util::AlignDown(cur, L2BlockSize);
if (unmapped) {
unmapped = false;
MESOSPHERE_RELEASE_LOG("%016lx - %016lx: not mapped\n", unmapped_start, cur - 1);
}
/* Print. */
MESOSPHERE_RELEASE_LOG("%016lx: %016lx PA=%p SZ=2M Mapped=%d UXN=%d PXN=%d Cont=%d nG=%d AF=%d SH=%x RO=%d UA=%d NS=%d AttrIndx=%d NoMerge=%d,%d,%d\n", cur,
*reinterpret_cast<const u64 *>(l2_entry),
reinterpret_cast<void *>(GetInteger(l2_entry->GetBlock())),
l2_entry->IsMapped(),
l2_entry->IsUserExecuteNever(),
l2_entry->IsPrivilegedExecuteNever(),
l2_entry->IsContiguous(),
!l2_entry->IsGlobal(),
static_cast<int>(l2_entry->GetAccessFlagInteger()),
static_cast<unsigned int>(l2_entry->GetShareableInteger()),
l2_entry->IsReadOnly(),
l2_entry->IsUserAccessible(),
l2_entry->IsNonSecure(),
static_cast<int>(l2_entry->GetPageAttributeInteger()),
l2_entry->IsHeadMergeDisabled(),
l2_entry->IsHeadAndBodyMergeDisabled(),
l2_entry->IsTailMergeDisabled());
/* Advance. */
cur += L2BlockSize;
continue;
} else if (!l2_entry->IsTable()) {
/* Update. */
cur = util::AlignDown(cur, L2BlockSize);
if (!unmapped) {
unmapped_start = cur;
unmapped = true;
}
/* Advance. */
cur += L2BlockSize;
continue;
}
/* Try to get from l3 table. */
const L3PageTableEntry *l3_entry = this->GetL3Entry(l2_entry, cur);
if (l3_entry->IsBlock()) {
/* Update. */
cur = util::AlignDown(cur, L3BlockSize);
if (unmapped) {
unmapped = false;
MESOSPHERE_RELEASE_LOG("%016lx - %016lx: not mapped\n", unmapped_start, cur - 1);
}
/* Print. */
MESOSPHERE_RELEASE_LOG("%016lx: %016lx PA=%p SZ=4K Mapped=%d UXN=%d PXN=%d Cont=%d nG=%d AF=%d SH=%x RO=%d UA=%d NS=%d AttrIndx=%d NoMerge=%d,%d,%d\n", cur,
*reinterpret_cast<const u64 *>(l3_entry),
reinterpret_cast<void *>(GetInteger(l3_entry->GetBlock())),
l3_entry->IsMapped(),
l3_entry->IsUserExecuteNever(),
l3_entry->IsPrivilegedExecuteNever(),
l3_entry->IsContiguous(),
!l3_entry->IsGlobal(),
static_cast<int>(l3_entry->GetAccessFlagInteger()),
static_cast<unsigned int>(l3_entry->GetShareableInteger()),
l3_entry->IsReadOnly(),
l3_entry->IsUserAccessible(),
l3_entry->IsNonSecure(),
static_cast<int>(l3_entry->GetPageAttributeInteger()),
l3_entry->IsHeadMergeDisabled(),
l3_entry->IsHeadAndBodyMergeDisabled(),
l3_entry->IsTailMergeDisabled());
/* Advance. */
cur += L3BlockSize;
continue;
} else {
/* Update. */
cur = util::AlignDown(cur, L3BlockSize);
if (!unmapped) {
unmapped_start = cur;
unmapped = true;
}
/* Advance. */
cur += L3BlockSize;
continue;
}
}
/* Print the last unmapped range if necessary. */
if (unmapped) {
MESOSPHERE_RELEASE_LOG("%016lx - %016lx: not mapped\n", unmapped_start, last);
}
}
size_t KPageTableImpl::CountPageTables() const {
size_t num_tables = 0;
#if defined(MESOSPHERE_BUILD_FOR_DEBUGGING)
{
++num_tables;
for (size_t l1_index = 0; l1_index < m_num_entries; ++l1_index) {
auto &l1_entry = m_table[l1_index];
if (l1_entry.IsTable()) {
++num_tables;
for (size_t l2_index = 0; l2_index < MaxPageTableEntries; ++l2_index) {
auto *l2_entry = GetPointer<L2PageTableEntry>(GetTableEntry(KMemoryLayout::GetLinearVirtualAddress(l1_entry.GetTable()), l2_index));
if (l2_entry->IsTable()) {
++num_tables;
}
}
}
}
}
#endif
return num_tables;
}
}