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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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9
libraries/libmesosphere/include/mesosphere/kern_k_page_table_manager.hpp
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@@ -25,18 +25,20 @@ namespace ams::kern {
class PageTablePage {
private:
u8 m_buffer[PageSize];
public:
ALWAYS_INLINE PageTablePage() { /* Do not initialize anything. */ }
};
static_assert(sizeof(PageTablePage) == PageSize);
}
class KPageTableManager : public KDynamicSlabHeap<impl::PageTablePage> {
class KPageTableManager : public KDynamicSlabHeap<impl::PageTablePage, true> {
public:
using RefCount = u16;
static constexpr size_t PageTableSize = sizeof(impl::PageTablePage);
static_assert(PageTableSize == PageSize);
private:
using BaseHeap = KDynamicSlabHeap<impl::PageTablePage>;
using BaseHeap = KDynamicSlabHeap<impl::PageTablePage, true>;
private:
RefCount *m_ref_counts;
public:
@@ -72,9 +74,6 @@ namespace ams::kern {
}
void Free(KVirtualAddress addr) {
/* Ensure all pages in the heap are zero. */
cpu::ClearPageToZero(GetVoidPointer(addr));
/* Free the page. */
BaseHeap::Free(GetPointer<impl::PageTablePage>(addr));
}