1 files changed, 30 insertions, 0 deletions
diff --git a/linux-2.6-xen-sparse/include/asm-xen/foreign_page.h b/linux-2.6-xen-sparse/include/asm-xen/foreign_page.h
new file mode 100644
index 0000000000..d043bc491d
--- /dev/null
+++ b/linux-2.6-xen-sparse/include/asm-xen/foreign_page.h
@@ -0,0 +1,30 @@
+/******************************************************************************
+ * foreign_page.h
+ * 
+ * Provide a "foreign" page type, that is owned by a foreign allocator and 
+ * not the normal buddy allocator in page_alloc.c
+ * 
+ * Copyright (c) 2004, K A Fraser
+ */
+
+#ifndef __ASM_XEN_FOREIGN_PAGE_H__
+#define __ASM_XEN_FOREIGN_PAGE_H__
+
+#define PG_foreign		PG_arch_1
+
+#define PageForeign(page)	test_bit(PG_foreign, &(page)->flags)
+
+#define SetPageForeign(page, dtor) do {		\
+	set_bit(PG_foreign, &(page)->flags);	\
+	(page)->mapping = (void *)dtor;		\
+} while (0)
+
+#define ClearPageForeign(page) do {		\
+	clear_bit(PG_foreign, &(page)->flags);	\
+	(page)->mapping = NULL;			\
+} while (0)
+
+#define PageForeignDestructor(page)	\
+	( (void (*) (struct page *)) (page)->mapping )
+
+#endif /* __ASM_XEN_FOREIGN_PAGE_H__ */