1 files changed, 33 insertions, 0 deletions
diff --git a/arch/sh/include/asm/segment.h b/arch/sh/include/asm/segment.h
new file mode 100644
index 000000000..02e54a333
--- /dev/null
+++ b/arch/sh/include/asm/segment.h
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_SH_SEGMENT_H
+#define __ASM_SH_SEGMENT_H
+
+#ifndef __ASSEMBLY__
+
+typedef struct {
+	unsigned long seg;
+} mm_segment_t;
+
+#define MAKE_MM_SEG(s)	((mm_segment_t) { (s) })
+
+/*
+ * The fs value determines whether argument validity checking should be
+ * performed or not.  If get_fs() == USER_DS, checking is performed, with
+ * get_fs() == KERNEL_DS, checking is bypassed.
+ *
+ * For historical reasons, these macros are grossly misnamed.
+ */
+#define KERNEL_DS	MAKE_MM_SEG(0xFFFFFFFFUL)
+#ifdef CONFIG_MMU
+#define USER_DS		MAKE_MM_SEG(PAGE_OFFSET)
+#else
+#define USER_DS		KERNEL_DS
+#endif
+
+#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
+
+#define get_fs()	(current_thread_info()->addr_limit)
+#define set_fs(x)	(current_thread_info()->addr_limit = (x))
+
+#endif /* __ASSEMBLY__ */
+#endif /* __ASM_SH_SEGMENT_H */