1 files changed, 53 insertions, 0 deletions
diff --git a/arch/csky/abiv2/inc/abi/pgtable-bits.h b/arch/csky/abiv2/inc/abi/pgtable-bits.h
new file mode 100644
index 000000000..526152bd2
--- /dev/null
+++ b/arch/csky/abiv2/inc/abi/pgtable-bits.h
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ASM_CSKY_PGTABLE_BITS_H
+#define __ASM_CSKY_PGTABLE_BITS_H
+
+/* implemented in software */
+#define _PAGE_ACCESSED		(1<<7)
+#define _PAGE_READ		(1<<8)
+#define _PAGE_WRITE		(1<<9)
+#define _PAGE_PRESENT		(1<<10)
+#define _PAGE_MODIFIED		(1<<11)
+
+/* We borrow bit 7 to store the exclusive marker in swap PTEs. */
+#define _PAGE_SWP_EXCLUSIVE	(1<<7)
+
+/* implemented in hardware */
+#define _PAGE_GLOBAL		(1<<0)
+#define _PAGE_VALID		(1<<1)
+#define _PAGE_DIRTY		(1<<2)
+
+#define _PAGE_SO		(1<<5)
+#define _PAGE_BUF		(1<<6)
+#define _PAGE_CACHE		(1<<3)
+#define _CACHE_MASK		_PAGE_CACHE
+
+#define _CACHE_CACHED		(_PAGE_CACHE | _PAGE_BUF)
+#define _CACHE_UNCACHED		(0)
+
+#define _PAGE_PROT_NONE		_PAGE_WRITE
+
+/*
+ * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
+ * are !pte_none() && !pte_present().
+ *
+ * Format of swap PTE:
+ *     bit          0:    _PAGE_GLOBAL (zero)
+ *     bit          1:    _PAGE_VALID (zero)
+ *     bit      2 - 6:    swap type
+ *     bit          7:    exclusive marker
+ *     bit          8:    swap offset[0]
+ *     bit          9:    _PAGE_WRITE (zero)
+ *     bit         10:    _PAGE_PRESENT (zero)
+ *     bit    11 - 31:    swap offset[1 - 21]
+ */
+#define __swp_type(x)			(((x).val >> 2) & 0x1f)
+#define __swp_offset(x)			((((x).val >> 8) & 0x1) | \
+					(((x).val >> 10) & 0x3ffffe))
+#define __swp_entry(type, offset)	((swp_entry_t) { \
+					((type & 0x1f) << 2) | \
+					((offset & 0x1) << 8) | \
+					((offset & 0x3ffffe) << 10)})
+
+#endif /* __ASM_CSKY_PGTABLE_BITS_H */