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kern: implement improved [new page tables are zero] invariant

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This commit is contained in:
Michael Scire 2021-06-17 13:03:46 -07:00
parent 25305257d6
commit 4892ffae15
5 changed files with 33 additions and 12 deletions
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12
libraries/libmesosphere/source/arch/arm64/kern_k_page_table.cpp
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@ -279,9 +279,10 @@ namespace ams::kern::arch::arm64 {
if (l1_entry->IsTable()) {
L2PageTableEntry *l2_entry = impl.GetL2Entry(l1_entry, cur_address);
if (l2_entry->IsTable()) {
KVirtualAddress l3_table = GetPageTableVirtualAddress(l2_entry->GetTable());
const KVirtualAddress l3_table = GetPageTableVirtualAddress(l2_entry->GetTable());
if (this->GetPageTableManager().IsInPageTableHeap(l3_table)) {
while (!this->GetPageTableManager().Close(l3_table, 1)) { /* ... */ }
ClearPageTable(l3_table);
this->GetPageTableManager().Free(l3_table);
}
}
@ -292,16 +293,21 @@ namespace ams::kern::arch::arm64 {
for (KProcessAddress cur_address = as_start; cur_address <= as_last; cur_address += L1BlockSize) {
L1PageTableEntry *l1_entry = impl.GetL1Entry(cur_address);
if (l1_entry->IsTable()) {
KVirtualAddress l2_table = GetPageTableVirtualAddress(l1_entry->GetTable());
const KVirtualAddress l2_table = GetPageTableVirtualAddress(l1_entry->GetTable());
if (this->GetPageTableManager().IsInPageTableHeap(l2_table)) {
while (!this->GetPageTableManager().Close(l2_table, 1)) { /* ... */ }
ClearPageTable(l2_table);
this->GetPageTableManager().Free(l2_table);
}
}
}
/* Free the L1 table. */
this->GetPageTableManager().Free(reinterpret_cast<uintptr_t>(impl.Finalize()));
{
const KVirtualAddress l1_table = reinterpret_cast<uintptr_t>(impl.Finalize());
ClearPageTable(l1_table);
this->GetPageTableManager().Free(l1_table);
}
/* Perform inherited finalization. */
KPageTableBase::Finalize();