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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/sh/include/asm/segment.h
Initial import
Diffstat (limited to 'arch/sh/include/asm/segment.h')
-rw-r--r--arch/sh/include/asm/segment.h34
1 files changed, 34 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..ff795d3a6
--- /dev/null
+++ b/arch/sh/include/asm/segment.h
@@ -0,0 +1,34 @@
+#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 segment_eq(a, b) ((a).seg == (b).seg)
+
+#define get_ds() (KERNEL_DS)
+
+#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 */