Added VMCache::DebugHasPage() and DebugLookupPage() for use in the kernel

debugger.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@36228 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/vm/VMCache.h

@@ -153,6 +153,9 @@ public:
 	virtual	void				AcquireStoreRef();
 	virtual	void				ReleaseStoreRef();
 
+	virtual	bool				DebugHasPage(off_t offset);
+			vm_page*			DebugLookupPage(off_t offset);
+
 public:
 			VMArea*				areas;
 			list_link			consumer_link;

src/system/kernel/vm/VMAnonymousCache.h

@@ -40,6 +40,7 @@ public:
 
 	virtual	status_t			Commit(off_t size, int priority);
 	virtual	bool				HasPage(off_t offset);
+	virtual	bool				DebugHasPage(off_t offset);
 
 	virtual	status_t			Read(off_t offset, const iovec* vecs,
 									size_t count, uint32 flags,

src/system/kernel/vm/VMCache.cpp

@@ -1239,6 +1239,27 @@ VMCache::ReleaseStoreRef()
 }
 
 
+/*!	Kernel debugger version of HasPage().
+	Does not do any locking.
+*/
+bool
+VMCache::DebugHasPage(off_t offset)
+{
+	// default that works for all subclasses that don't lock anyway
+	return HasPage(offset);
+}
+
+
+/*!	Kernel debugger version of LookupPage().
+	Does not do any locking.
+*/
+vm_page*
+VMCache::DebugLookupPage(off_t offset)
+{
+	return pages.Lookup((page_num_t)(offset >> PAGE_SHIFT));
+}
+
+
 /*!	Wakes up threads waiting for page events.
 	\param page The page for which events occurred.
 	\param events The mask of events that occurred.