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kern: Map L1/L2 blocks when possible

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This commit is contained in:
Michael Scire
2020-07-27 03:00:04 -07:00
committed by SciresM
parent 4ac94e9179
commit 9dc3e025fc
2 changed files with 88 additions and 7 deletions
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77
libraries/libmesosphere/source/arch/arm64/kern_k_page_table.cpp
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@@ -358,7 +358,82 @@ namespace ams::kern::arch::arm64 {
}
}
Result KPageTable::Map(KProcessAddress virt_addr, KPhysicalAddress phys_addr, size_t num_pages, PageTableEntry entry_template, PageLinkedList *page_list, bool reuse_ll) {
Result KPageTable::MapL1Blocks(KProcessAddress virt_addr, KPhysicalAddress phys_addr, size_t num_pages, PageTableEntry entry_template, PageLinkedList *page_list, bool reuse_ll) {
MESOSPHERE_ASSERT(this->IsLockedByCurrentThread());
MESOSPHERE_ASSERT(util::IsAligned(GetInteger(virt_addr), L1BlockSize));
MESOSPHERE_ASSERT(util::IsAligned(GetInteger(phys_addr), L1BlockSize));
MESOSPHERE_ASSERT(util::IsAligned(num_pages * PageSize, L1BlockSize));
auto &impl = this->GetImpl();
/* Iterate, mapping each block. */
for (size_t i = 0; i < num_pages; i += L1BlockSize / PageSize) {
/* Map the block. */
*impl.GetL1Entry(virt_addr) = L1PageTableEntry(PageTableEntry::BlockTag{}, phys_addr, PageTableEntry(entry_template), false);
virt_addr += L1BlockSize;
phys_addr += L1BlockSize;
}
return ResultSuccess();
}
Result KPageTable::MapL2Blocks(KProcessAddress virt_addr, KPhysicalAddress phys_addr, size_t num_pages, PageTableEntry entry_template, PageLinkedList *page_list, bool reuse_ll) {
MESOSPHERE_ASSERT(this->IsLockedByCurrentThread());
MESOSPHERE_ASSERT(util::IsAligned(GetInteger(virt_addr), L2BlockSize));
MESOSPHERE_ASSERT(util::IsAligned(GetInteger(phys_addr), L2BlockSize));
MESOSPHERE_ASSERT(util::IsAligned(num_pages * PageSize, L2BlockSize));
auto &impl = this->GetImpl();
KVirtualAddress l2_virt = Null<KVirtualAddress>;
int l2_open_count = 0;
/* Iterate, mapping each block. */
for (size_t i = 0; i < num_pages; i += L2BlockSize / PageSize) {
KPhysicalAddress l2_phys = Null<KPhysicalAddress>;
/* If we have no L2 table, we should get or allocate one. */
if (l2_virt == Null<KVirtualAddress>) {
if (L1PageTableEntry *l1_entry = impl.GetL1Entry(virt_addr); !l1_entry->GetTable(l2_phys)) {
/* Allocate table. */
l2_virt = AllocatePageTable(page_list, reuse_ll);
R_UNLESS(l2_virt != Null<KVirtualAddress>, svc::ResultOutOfResource());
/* Set the entry. */
l2_phys = GetPageTablePhysicalAddress(l2_virt);
PteDataSynchronizationBarrier();
*l1_entry = L1PageTableEntry(PageTableEntry::TableTag{}, l2_phys, this->IsKernel(), true);
PteDataSynchronizationBarrier();
} else {
l2_virt = GetPageTableVirtualAddress(l2_phys);
}
}
MESOSPHERE_ASSERT(l2_virt != Null<KVirtualAddress>);
/* Map the block. */
*impl.GetL2EntryFromTable(l2_virt, virt_addr) = L2PageTableEntry(PageTableEntry::BlockTag{}, phys_addr, PageTableEntry(entry_template), false);
l2_open_count++;
virt_addr += L2BlockSize;
phys_addr += L2BlockSize;
/* Account for hitting end of table. */
if (util::IsAligned(GetInteger(virt_addr), L1BlockSize)) {
if (this->GetPageTableManager().IsInPageTableHeap(l2_virt)) {
this->GetPageTableManager().Open(l2_virt, l2_open_count);
}
l2_virt = Null<KVirtualAddress>;
l2_open_count = 0;
}
}
/* Perform any remaining opens. */
if (l2_open_count > 0 && this->GetPageTableManager().IsInPageTableHeap(l2_virt)) {
this->GetPageTableManager().Open(l2_virt, l2_open_count);
}
return ResultSuccess();
}
Result KPageTable::MapL3Blocks(KProcessAddress virt_addr, KPhysicalAddress phys_addr, size_t num_pages, PageTableEntry entry_template, PageLinkedList *page_list, bool reuse_ll) {
MESOSPHERE_ASSERT(this->IsLockedByCurrentThread());
MESOSPHERE_ASSERT(util::IsAligned(GetInteger(virt_addr), PageSize));
MESOSPHERE_ASSERT(util::IsAligned(GetInteger(phys_addr), PageSize));