kern: KSupervisorPageTable now checks wxn instead of setting it

libraries/libmesosphere/include/mesosphere/arch/arm64/kern_cpu_system_registers.hpp

@@ -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. */

libraries/libmesosphere/include/mesosphere/arch/arm64/kern_k_supervisor_page_table.hpp

@@ -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();
             }