include/asm-nios2nommu/segment.h

   1 #ifndef _NIOS2NOMMU_SEGMENT_H
   2 #define _NIOS2NOMMU_SEGMENT_H
   3
   4 /*--------------------------------------------------------------------
   5  *
   6  * include/asm-nios2nommu/segment.h
   7  *
   8  * Derived from M68knommu
   9  *
  10  * Copyright (C) 2004   Microtronix Datacom Ltd
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  *
  23  * Jan/20/2004          dgt         NiosII
  24  *
  25  ---------------------------------------------------------------------*/
  26
  27
  28 /* define constants */
  29 /* Address spaces (FC0-FC2) */
  30 #define USER_DATA     (1)
  31 #ifndef __USER_DS
  32 #define __USER_DS     (USER_DATA)
  33 #endif
  34 #define USER_PROGRAM  (2)
  35 #define SUPER_DATA    (5)
  36 #ifndef __KERNEL_DS
  37 #define __KERNEL_DS   (SUPER_DATA)
  38 #endif
  39 #define SUPER_PROGRAM (6)
  40 #define CPU_SPACE     (7)
  41
  42 #ifndef __ASSEMBLY__
  43
  44 typedef struct {
  45         unsigned long seg;
  46 } mm_segment_t;
  47
  48 #define MAKE_MM_SEG(s)  ((mm_segment_t) { (s) })
  49 #define USER_DS         MAKE_MM_SEG(__USER_DS)
  50 #define KERNEL_DS       MAKE_MM_SEG(__KERNEL_DS)
  51
  52 /*
  53  * Get/set the SFC/DFC registers for MOVES instructions
  54  */
  55
  56 static inline mm_segment_t get_fs(void)
  57 {
  58     return USER_DS;
  59 }
  60
  61 static inline mm_segment_t get_ds(void)
  62 {
  63     /* return the supervisor data space code */
  64     return KERNEL_DS;
  65 }
  66
  67 static inline void set_fs(mm_segment_t val)
  68 {
  69 }
  70
  71 #define segment_eq(a,b) ((a).seg == (b).seg)
  72
  73 #endif /* __ASSEMBLY__ */
  74
  75 #endif /* _NIOS2NOMMU_SEGMENT_H */