kern: implement unsuspension of init threads

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

@@ -25,6 +25,11 @@ namespace ams::kern::arch::arm64 {
         public:
             constexpr KProcessPageTable() : page_table() { /* ... */ }
 
+            void Activate(u64 id) {
+                /* Activate the page table with the specified contextidr. */
+                this->page_table.Activate(id);
+            }
+
             Result Initialize(u32 id, ams::svc::CreateProcessFlag as_type, bool enable_aslr, bool from_back, KMemoryManager::Pool pool, KProcessAddress code_address, size_t code_size, KMemoryBlockSlabManager *mem_block_slab_manager, KBlockInfoManager *block_info_manager, KPageTableManager *pt_manager) {
                 return this->page_table.InitializeForProcess(id, as_type, enable_aslr, from_back, pool, code_address, code_size, mem_block_slab_manager, block_info_manager, pt_manager);
             }

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

@@ -28,7 +28,19 @@ namespace ams::kern::arch::arm64 {
             constexpr KSupervisorPageTable() : page_table(), ttbr0() { /* ... */ }
 
             NOINLINE void Initialize(s32 core_id);
-            NOINLINE void Activate();
+
+            void Activate() {
+                /* Activate, using process id = 0xFFFFFFFF */
+                this->page_table.Activate(0xFFFFFFFF);
+            }
+
+            void ActivateForInit() {
+                this->Activate();
+
+                /* Invalidate entire TLB. */
+                cpu::InvalidateEntireTlb();
+            }
+
             void Finalize(s32 core_id);
 
             Result MapPages(KProcessAddress *out_addr, size_t num_pages, size_t alignment, KPhysicalAddress phys_addr, KProcessAddress region_start, size_t region_num_pages, KMemoryState state, KMemoryPermission perm) {