memory: Add GetCurrentPageTable/SetCurrentPageTable

Don't expose Memory::current_page_table as a global.

src/core/hle/kernel/thread.cpp

@@ -178,16 +178,13 @@ static void SwitchContext(Thread* new_thread) {
         ready_queue.remove(new_thread->current_priority, new_thread);
         new_thread->status = THREADSTATUS_RUNNING;
 
-        Core::CPU().LoadContext(new_thread->context);
-        Core::CPU().SetCP15Register(CP15_THREAD_URO, new_thread->GetTLSAddress());
-
         if (previous_process != current_thread->owner_process) {
             Kernel::g_current_process = current_thread->owner_process;
-            Memory::current_page_table = &Kernel::g_current_process->vm_manager.page_table;
+            SetCurrentPageTable(&Kernel::g_current_process->vm_manager.page_table);
-            // We have switched processes and thus, page tables, clear the instruction cache so we
-            // don't keep stale data from the previous process.
-            Core::CPU().ClearInstructionCache();
         }
+
+        Core::CPU().LoadContext(new_thread->context);
+        Core::CPU().SetCP15Register(CP15_THREAD_URO, new_thread->GetTLSAddress());
     } else {
         current_thread = nullptr;
         // Note: We do not reset the current process and current page table when idling because

src/core/loader/3dsx.cpp

@@ -270,7 +270,7 @@ ResultStatus AppLoader_THREEDSX::Load() {
     Kernel::g_current_process = Kernel::Process::Create(std::move(codeset));
     Kernel::g_current_process->svc_access_mask.set();
     Kernel::g_current_process->address_mappings = default_address_mappings;
-    Memory::current_page_table = &Kernel::g_current_process->vm_manager.page_table;
+    Memory::SetCurrentPageTable(&Kernel::g_current_process->vm_manager.page_table);
 
     // Attach the default resource limit (APPLICATION) to the process
     Kernel::g_current_process->resource_limit =

src/core/loader/elf.cpp

@@ -397,7 +397,7 @@ ResultStatus AppLoader_ELF::Load() {
     Kernel::g_current_process = Kernel::Process::Create(std::move(codeset));
     Kernel::g_current_process->svc_access_mask.set();
     Kernel::g_current_process->address_mappings = default_address_mappings;
-    Memory::current_page_table = &Kernel::g_current_process->vm_manager.page_table;
+    Memory::SetCurrentPageTable(&Kernel::g_current_process->vm_manager.page_table);
 
     // Attach the default resource limit (APPLICATION) to the process
     Kernel::g_current_process->resource_limit =

src/core/loader/ncch.cpp

@@ -172,7 +172,7 @@ ResultStatus AppLoader_NCCH::LoadExec() {
         codeset->memory = std::make_shared<std::vector<u8>>(std::move(code));
 
         Kernel::g_current_process = Kernel::Process::Create(std::move(codeset));
-        Memory::current_page_table = &Kernel::g_current_process->vm_manager.page_table;
+        Memory::SetCurrentPageTable(&Kernel::g_current_process->vm_manager.page_table);
 
         // Attach a resource limit to the process based on the resource limit category
         Kernel::g_current_process->resource_limit =

src/core/memory.cpp

@@ -22,12 +22,20 @@ namespace Memory {
 static std::array<u8, Memory::VRAM_SIZE> vram;
 static std::array<u8, Memory::N3DS_EXTRA_RAM_SIZE> n3ds_extra_ram;
 
-PageTable* current_page_table = nullptr;
+static PageTable* current_page_table = nullptr;
 
 std::array<u8*, PAGE_TABLE_NUM_ENTRIES>* GetCurrentPageTablePointers() {
     return &current_page_table->pointers;
 }
 
+void SetCurrentPageTable(PageTable* page_table) {
+    current_page_table = page_table;
+}
+
+PageTable* GetCurrentPageTable() {
+    return current_page_table;
+}
+
 static void MapPages(PageTable& page_table, u32 base, u32 size, u8* memory, PageType type) {
     LOG_DEBUG(HW_Memory, "Mapping %p onto %08X-%08X", memory, base * PAGE_SIZE,
               (base + size) * PAGE_SIZE);

src/core/memory.h

@@ -182,7 +182,8 @@ enum : VAddr {
 };
 
 /// Currently active page table
-extern PageTable* current_page_table;
+void SetCurrentPageTable(PageTable* page_table);
+PageTable* GetCurrentPageTable();
 
 bool IsValidVirtualAddress(const VAddr addr);
 bool IsValidPhysicalAddress(const PAddr addr);

src/tests/core/arm/arm_test_common.cpp

@@ -21,7 +21,7 @@ TestEnvironment::TestEnvironment(bool mutable_memory_)
     Memory::MapIoRegion(page_table, 0x00000000, 0x80000000, test_memory);
     Memory::MapIoRegion(page_table, 0x80000000, 0x80000000, test_memory);
 
-    Memory::current_page_table = &page_table;
+    Memory::SetCurrentPageTable(&page_table);
 }
 
 TestEnvironment::~TestEnvironment() {