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Linux/arch/frv/include/asm/segment.h

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  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 #ifdef CONFIG_MMU
 25 #define USER_DS                 MAKE_MM_SEG(TASK_SIZE - 1)
 26 #define KERNEL_DS               MAKE_MM_SEG(0xdfffffffUL)
 27 #else
 28 #define USER_DS                 MAKE_MM_SEG(memory_end)
 29 #define KERNEL_DS               MAKE_MM_SEG(0xe0000000UL)
 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 */
 46 

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