update

[l4.git] / kernel / fiasco / src / kern / ia32 / vm.cpp

diff --git a/kernel/fiasco/src/kern/ia32/vm.cpp b/kernel/fiasco/src/kern/ia32/vm.cpp
index 93592e708fcb5f8d728395e46135c66d9764bc6c..df03955e6e0b636fefd8b7d14c4e1b8e4ee3229a 100644 (file)
--- a/kernel/fiasco/src/kern/ia32/vm.cpp
+++ b/kernel/fiasco/src/kern/ia32/vm.cpp
@@ -58,6 +58,34 @@ Vm::allocator()
   return slabs;
 }
 
+PUBLIC static
+int
+Vm::getpage(Utcb *utcb, L4_msg_tag tag, void **addr)
+{
+  L4_snd_item_iter item(utcb, tag.words());
+
+  if (EXPECT_FALSE(!tag.items() || !item.next()))
+    return -L4_err::EInval;
+
+  L4_fpage page(item.get()->d);
+
+  if (EXPECT_FALSE(   !page.is_mempage()
+                   || page.order() < 12))
+    return -L4_err::EInval;
+
+  unsigned int page_attribs;
+  Mem_space::Phys_addr phys;
+  Mem_space::Size size;
+
+  if (EXPECT_FALSE(!current()->space()->mem_space()
+                        ->v_lookup(Virt_addr(page.mem_address()),
+                                   &phys, &size, &page_attribs)))
+    return -L4_err::EInval;
+
+  *addr = (void *)Virt_addr(page.mem_address()).value();
+
+  return 0;
+}
 
 PUBLIC
 template< typename Vm_impl >