sh: Abstract the number of page table levels
Keep the dimensions of the page tables in a separate header file in
preparation for allowing a three level page table structure.
Signed-off-by: Matt Fleming <matt@console-pimps.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/include/asm/pgtable_nopmd.h b/arch/sh/include/asm/pgtable_nopmd.h
new file mode 100644
index 0000000..f0b525b
--- /dev/null
+++ b/arch/sh/include/asm/pgtable_nopmd.h
@@ -0,0 +1,22 @@
+#ifndef __ASM_SH_PGTABLE_NOPMD_H
+#define __ASM_SH_PGTABLE_NOPMD_H
+
+#include <asm-generic/pgtable-nopmd.h>
+
+/*
+ * traditional two-level paging structure
+ */
+
+/* PTE bits */
+#define PTE_MAGNITUDE 2 /* 32-bit PTEs */
+
+#define PTE_SHIFT PAGE_SHIFT
+#define PTE_BITS (PTE_SHIFT - PTE_MAGNITUDE)
+
+/* PGD bits */
+#define PGDIR_SHIFT (PTE_SHIFT + PTE_BITS)
+
+#define PTRS_PER_PGD (PAGE_SIZE / (1 << PTE_MAGNITUDE))
+#define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE)
+
+#endif /* __ASM_SH_PGTABLE_NOPMD_H */