This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / include / xen / foreign_page.h

diff --git a/include/xen/foreign_page.h b/include/xen/foreign_page.h
new file mode 100644 (file)
index 0000000..d043bc4
--- /dev/null
+++ b/include/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__ */