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kern: KSupervisorPageTable now checks wxn instead of setting it

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This commit is contained in:
Michael Scire 2023-10-11 08:41:36 -07:00 committed by SciresM
parent 85b5f20395
commit b7384a8667
3 changed files with 7 additions and 10 deletions
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4
libraries/libmesosphere/include/mesosphere/arch/arm64/kern_cpu_system_registers.hpp
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@ -372,6 +372,10 @@ namespace ams::kern::arch::arm64::cpu {
this->SetBit(19, en);
return *this;
}
constexpr ALWAYS_INLINE bool GetWxn() const {
return this->GetBits(19, 1) != 0;
}
};
/* Accessors for timer registers. */

5
libraries/libmesosphere/include/mesosphere/arch/arm64/kern_k_supervisor_page_table.hpp
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@ -23,9 +23,8 @@ namespace ams::kern::arch::arm64 {
class KSupervisorPageTable {
private:
KPageTable m_page_table;
u64 m_ttbr0_identity[cpu::NumCores];
public:
constexpr KSupervisorPageTable() : m_page_table(util::ConstantInitialize), m_ttbr0_identity() { /* ... */ }
constexpr KSupervisorPageTable() : m_page_table(util::ConstantInitialize) { /* ... */ }
NOINLINE void Initialize(s32 core_id);
@ -61,8 +60,6 @@ namespace ams::kern::arch::arm64 {
return m_page_table.GetPhysicalAddress(out, address);
}
constexpr u64 GetIdentityMapTtbr0(s32 core_id) const { return m_ttbr0_identity[core_id]; }
void DumpMemoryBlocks() const {
return m_page_table.DumpMemoryBlocks();
}

8
libraries/libmesosphere/source/arch/arm64/kern_k_supervisor_page_table.cpp
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@ -18,12 +18,8 @@
namespace ams::kern::arch::arm64 {
void KSupervisorPageTable::Initialize(s32 core_id) {
/* Get the identity mapping ttbr0. */
m_ttbr0_identity[core_id] = cpu::GetTtbr0El1();
/* Set sctlr_el1 */
cpu::SystemControlRegisterAccessor().SetWxn(true).Store();
cpu::EnsureInstructionConsistency();
/* Verify that sctlr_el1 has the wxn bit set. */
MESOSPHERE_ABORT_UNLESS(cpu::SystemControlRegisterAccessor().GetWxn());
/* Invalidate the entire TLB. */
cpu::InvalidateEntireTlb();