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kern: update KernelLdr for 19.0.0 (new checks, dummy function call).

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Also, fix a few very embarassing mistakes in kernel ldr:
* We have been mapping the page table region RWX for a few years now, accidentally.
* My attempt at making initial page tables not use bit 58 was broken in multiple ways.
This commit is contained in:
Michael Scire
2025-04-07 16:46:58 -07:00
parent 4e99a5e08d
commit 85fd13f724
4 changed files with 27 additions and 18 deletions
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13
libraries/libmesosphere/source/arch/arm64/kern_k_page_table_impl.cpp
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@@ -21,12 +21,6 @@ namespace ams::kern::arch::arm64 {
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;
/* 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 };
@@ -68,7 +62,6 @@ namespace ams::kern::arch::arm64 {
/* 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;
}
@@ -83,6 +76,12 @@ namespace ams::kern::arch::arm64 {
}
}
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;
}