release/src-rt-6.x/linux/linux-2.6/include/asm-frv/segment.h

   1 /* segment.h: MMU segment settings
   2  *
   3  * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #ifndef _ASM_SEGMENT_H
  13 #define _ASM_SEGMENT_H
  14
  15
  16 #ifndef __ASSEMBLY__
  17
  18 typedef struct {
  19         unsigned long seg;
  20 } mm_segment_t;
  21
  22 #define MAKE_MM_SEG(s)  ((mm_segment_t) { (s) })
  23
  24 #define KERNEL_DS               MAKE_MM_SEG(0xdfffffffUL)
  25
  26 #ifdef CONFIG_MMU
  27 #define USER_DS                 MAKE_MM_SEG(TASK_SIZE - 1)
  28 #else
  29 #define USER_DS                 KERNEL_DS
  30 #endif
  31
  32 #define get_ds()                (KERNEL_DS)
  33 #define get_fs()                (__current_thread_info->addr_limit)
  34 #define segment_eq(a,b)         ((a).seg == (b).seg)
  35 #define __kernel_ds_p()         segment_eq(get_fs(), KERNEL_DS)
  36 #define get_addr_limit()        (get_fs().seg)
  37
  38 #define set_fs(_x)                                      \
  39 do {                                                    \
  40         __current_thread_info->addr_limit = (_x);       \
  41 } while(0)
  42
  43
  44 #endif /* __ASSEMBLY__ */
  45 #endif /* _ASM_SEGMENT_H */