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 #include <linux/config.h>
  16
  17 #ifndef __ASSEMBLY__
  18
  19 typedef struct {
  20         unsigned long seg;
  21 } mm_segment_t;
  22
  23 #define MAKE_MM_SEG(s)  ((mm_segment_t) { (s) })
  24
  25 #define KERNEL_DS               MAKE_MM_SEG(0xdfffffffUL)
  26
  27 #ifdef CONFIG_MMU
  28 #define USER_DS                 MAKE_MM_SEG(TASK_SIZE - 1)
  29 #else
  30 #define USER_DS                 KERNEL_DS
  31 #endif
  32
  33 #define get_ds()                (KERNEL_DS)
  34 #define get_fs()                (__current_thread_info->addr_limit)
  35 #define segment_eq(a,b)         ((a).seg == (b).seg)
  36 #define __kernel_ds_p()         segment_eq(get_fs(), KERNEL_DS)
  37 #define get_addr_limit()        (get_fs().seg)
  38
  39 #define set_fs(_x)                                      \
  40 do {                                                    \
  41         __current_thread_info->addr_limit = (_x);       \
  42 } while(0)
  43
  44
  45 #endif /* __ASSEMBLY__ */
  46 #endif /* _ASM_SEGMENT_H */