sh: Consolidate segment modifiers across mmu/nommu systems.

This moves get_fs/set_fs() and friends in to asm/segment.h. The
mm_segment_t definition is likewise consolidated from the _32/_64 split.

This is prepatory groundwork for using the generic address space limit
and verification routines across mmu/nommu configs.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

include/asm-sh/processor.h

@@ -2,6 +2,7 @@
 #define __ASM_SH_PROCESSOR_H
 
 #include <asm/cpu-features.h>
+#include <asm/segment.h>
 
 #ifndef __ASSEMBLY__
 /*

include/asm-sh/processor_32.h

@@ -113,10 +113,6 @@ struct thread_struct {
 	union sh_fpu_union fpu;
 };
 
-typedef struct {
-	unsigned long seg;
-} mm_segment_t;
-
 /* Count of active tasks with UBC settings */
 extern int ubc_usercnt;
 

include/asm-sh/processor_64.h

@@ -166,10 +166,6 @@ struct thread_struct {
 	union sh_fpu_union fpu;
 };
 
-typedef struct {
-	unsigned long seg;
-} mm_segment_t;
-
 #define INIT_MMAP \
 { &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
 

include/asm-sh/segment.h

@@ -1,6 +1,34 @@
 #ifndef __ASM_SH_SEGMENT_H
 #define __ASM_SH_SEGMENT_H
 
-/* Only here because we have some old header files that expect it.. */
+#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 */

include/asm-sh/uaccess_32.h

@@ -1,9 +1,8 @@
-/* $Id: uaccess.h,v 1.11 2003/10/13 07:21:20 lethal Exp $
- *
+/*
  * User space memory access functions
  *
  * Copyright (C) 1999, 2002  Niibe Yutaka
- * Copyright (C) 2003  Paul Mundt
+ * Copyright (C) 2003 - 2008  Paul Mundt
  *
  *  Based on:
  *     MIPS implementation version 1.15 by
@@ -15,40 +14,16 @@
 
 #include <linux/errno.h>
 #include <linux/sched.h>
+#include <asm/segment.h>
 
 #define VERIFY_READ    0
 #define VERIFY_WRITE   1
 
-/*
- * 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 (Data Segment Register?), these macros are misnamed.
- */
-
-#define MAKE_MM_SEG(s)	((mm_segment_t) { (s) })
-
-#define KERNEL_DS	MAKE_MM_SEG(0xFFFFFFFFUL)
-#define USER_DS		MAKE_MM_SEG(PAGE_OFFSET)
-
-#define segment_eq(a,b)	((a).seg == (b).seg)
-
-#define get_ds()	(KERNEL_DS)
 
 #if !defined(CONFIG_MMU)
 /* NOMMU is always true */
 #define __addr_ok(addr) (1)
 
-static inline mm_segment_t get_fs(void)
-{
-	return USER_DS;
-}
-
-static inline void set_fs(mm_segment_t s)
-{
-}
-
 /*
  * __access_ok: Check if address with size is OK or not.
  *
@@ -64,8 +39,6 @@ static inline int __access_ok(unsigned long addr, unsigned long size)
 #define __addr_ok(addr) \
 	((unsigned long)(addr) < (current_thread_info()->addr_limit.seg))
 
-#define get_fs()	(current_thread_info()->addr_limit)
-#define set_fs(x)	(current_thread_info()->addr_limit = (x))
 
 /*
  * __access_ok: Check if address with size is OK or not.