Index: uspace/lib/c/generic/as.c
===================================================================
--- uspace/lib/c/generic/as.c	(revision 5d00e4020b7b5f980093c2a2251d4139e3abaa21)
+++ uspace/lib/c/generic/as.c	(revision c2020f7fee59f8604b9f025a9e1210aaa80b1529)
@@ -35,4 +35,5 @@
 #include <as.h>
 #include <libc.h>
+#include <errno.h>
 #include <unistd.h>
 #include <align.h>
@@ -128,4 +129,30 @@
 }
 
+/** Find mapping to physical address.
+ *
+ * @param address Virtual address in question (virtual).
+ * @param[out] frame Frame address (physical).
+ * @return Error code.
+ * @retval EOK No error, @p frame holds the translation.
+ * @retval ENOENT Mapping not found.
+ */
+int as_get_physical_mapping(void *address, uintptr_t *frame)
+{
+	uintptr_t tmp_frame;
+	uintptr_t virt = (uintptr_t) address;
+	
+	int rc = (int) __SYSCALL2(SYS_PAGE_FIND_MAPPING,
+	    (sysarg_t) virt, (sysarg_t) &tmp_frame);
+	if (rc != EOK) {
+		return rc;
+	}
+	
+	if (frame != NULL) {
+		*frame = tmp_frame;
+	}
+	
+	return EOK;
+}
+
 /** @}
  */
Index: uspace/lib/c/include/as.h
===================================================================
--- uspace/lib/c/include/as.h	(revision 5d00e4020b7b5f980093c2a2251d4139e3abaa21)
+++ uspace/lib/c/include/as.h	(revision c2020f7fee59f8604b9f025a9e1210aaa80b1529)
@@ -47,4 +47,5 @@
 extern void *set_maxheapsize(size_t mhs);
 extern void * as_get_mappable_page(size_t sz);
+extern int as_get_physical_mapping(void *address, uintptr_t *frame);
 
 #endif