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-rw-r--r--include/linux/pfn.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/pfn.h b/include/linux/pfn.h
new file mode 100644
index 0000000..bb01f8b
--- /dev/null
+++ b/include/linux/pfn.h
@@ -0,0 +1,9 @@
+#ifndef _LINUX_PFN_H_
+#define _LINUX_PFN_H_
+
+#define PFN_ALIGN(x) (((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK)
+#define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
+#define PFN_DOWN(x) ((x) >> PAGE_SHIFT)
+#define PFN_PHYS(x) ((x) << PAGE_SHIFT)
+
+#endif
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