Fix /proc/PID/stack in the new per-process page directory world.

I added an RAII helper called OtherTaskPagingScope. While present,
it switches the kernel over to using another task's page directory.
This is perfect for e.g walking the stack in /proc/PID/stack.

1 files changed, 10 insertions, 3 deletions

diff --git a/Kernel/MemoryManager.h b/Kernel/MemoryManager.h
index 34d173d343..33c124aed1 100644
--- a/Kernel/MemoryManager.h
+++ b/Kernel/MemoryManager.h
@@ -54,13 +54,10 @@ public:
 
     bool mapSubregion(Task&, Task::Subregion&);
     bool unmapSubregion(Task&, Task::Subregion&);
-    bool mapSubregionsForTask(Task&);
-    bool unmapSubregionsForTask(Task&);
 
     bool mapRegion(Task&, Task::Region&);
     bool unmapRegion(Task&, Task::Region&);
     bool mapRegionsForTask(Task&);
-    bool unmapRegionsForTask(Task&);
 
     void registerZone(Zone&);
     void unregisterZone(Zone&);
@@ -182,3 +179,13 @@ private:
 
     Vector<PhysicalAddress> m_freePages;
 };
+
+struct KernelPagingScope {
+    KernelPagingScope() { MM.enter_kernel_paging_scope(); }
+    ~KernelPagingScope() { MM.enter_task_paging_scope(*current); }
+};
+
+struct OtherTaskPagingScope {
+    OtherTaskPagingScope(Task& task) { MM.enter_task_paging_scope(task); }
+    ~OtherTaskPagingScope() { MM.enter_task_paging_scope(*current); }
+};