1 files changed, 43 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/pgtable-bits.h b/arch/riscv/include/asm/pgtable-bits.h
new file mode 100644
index 000000000..bbaeb5d35
--- /dev/null
+++ b/arch/riscv/include/asm/pgtable-bits.h
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (C) 2012 Regents of the University of California
+ */
+
+#ifndef _ASM_RISCV_PGTABLE_BITS_H
+#define _ASM_RISCV_PGTABLE_BITS_H
+
+/*
+ * PTE format:
+ * | XLEN-1  10 | 9             8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0
+ *       PFN      reserved for SW   D   A   G   U   X   W   R   V
+ */
+
+#define _PAGE_ACCESSED_OFFSET 6
+
+#define _PAGE_PRESENT   (1 << 0)
+#define _PAGE_READ      (1 << 1)    /* Readable */
+#define _PAGE_WRITE     (1 << 2)    /* Writable */
+#define _PAGE_EXEC      (1 << 3)    /* Executable */
+#define _PAGE_USER      (1 << 4)    /* User */
+#define _PAGE_GLOBAL    (1 << 5)    /* Global */
+#define _PAGE_ACCESSED  (1 << 6)    /* Set by hardware on any access */
+#define _PAGE_DIRTY     (1 << 7)    /* Set by hardware on any write */
+#define _PAGE_SOFT      (1 << 8)    /* Reserved for software */
+
+#define _PAGE_SPECIAL   _PAGE_SOFT
+#define _PAGE_TABLE     _PAGE_PRESENT
+
+/*
+ * _PAGE_PROT_NONE is set on not-present pages (and ignored by the hardware) to
+ * distinguish them from swapped out pages
+ */
+#define _PAGE_PROT_NONE _PAGE_READ
+
+#define _PAGE_PFN_SHIFT 10
+
+/* Set of bits to preserve across pte_modify() */
+#define _PAGE_CHG_MASK  (~(unsigned long)(_PAGE_PRESENT | _PAGE_READ |	\
+					  _PAGE_WRITE | _PAGE_EXEC |	\
+					  _PAGE_USER | _PAGE_GLOBAL))
+
+#endif /* _ASM_RISCV_PGTABLE_BITS_H */