target/linux/ubicom32/files/arch/ubicom32/include/asm/segment.h

   1 /*
   2  * arch/ubicom32/include/asm/segment.h
   3  *   Memory segment definitions for Ubicom32 architecture.
   4  *
   5  * (C) Copyright 2009, Ubicom, Inc.
   6  *
   7  * This file is part of the Ubicom32 Linux Kernel Port.
   8  *
   9  * The Ubicom32 Linux Kernel Port is free software: you can redistribute
  10  * it and/or modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation, either version 2 of the
  12  * License, or (at your option) any later version.
  13  *
  14  * The Ubicom32 Linux Kernel Port is distributed in the hope that it
  15  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  16  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  * the GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with the Ubicom32 Linux Kernel Port.  If not,
  21  * see <http://www.gnu.org/licenses/>.
  22  *
  23  * Ubicom32 implementation derived from (with many thanks):
  24  *   arch/m68knommu
  25  *   arch/blackfin
  26  *   arch/parisc
  27  */
  28 #ifndef _ASM_UBICOM32_SEGMENT_H
  29 #define _ASM_UBICOM32_SEGMENT_H
  30
  31 /* define constants */
  32 /* Address spaces (FC0-FC2) */
  33 #define USER_DATA     (1)
  34 #ifndef __USER_DS
  35 #define __USER_DS     (USER_DATA)
  36 #endif
  37 #define USER_PROGRAM  (2)
  38 #define SUPER_DATA    (5)
  39 #ifndef __KERNEL_DS
  40 #define __KERNEL_DS   (SUPER_DATA)
  41 #endif
  42 #define SUPER_PROGRAM (6)
  43 #define CPU_SPACE     (7)
  44
  45 #ifndef __ASSEMBLY__
  46
  47 typedef struct {
  48         unsigned long seg;
  49 } mm_segment_t;
  50
  51 #define MAKE_MM_SEG(s)  ((mm_segment_t) { (s) })
  52 #define USER_DS         MAKE_MM_SEG(__USER_DS)
  53 #define KERNEL_DS       MAKE_MM_SEG(__KERNEL_DS)
  54
  55 /*
  56  * Get/set the SFC/DFC registers for MOVES instructions
  57  */
  58
  59 static inline mm_segment_t get_fs(void)
  60 {
  61     return USER_DS;
  62 }
  63
  64 static inline mm_segment_t get_ds(void)
  65 {
  66     /* return the supervisor data space code */
  67     return KERNEL_DS;
  68 }
  69
  70 static inline void set_fs(mm_segment_t val)
  71 {
  72 }
  73
  74 #define segment_eq(a,b) ((a).seg == (b).seg)
  75
  76 #endif /* __ASSEMBLY__ */
  77
  78 #endif /* _ASM_UBICOM32_SEGMENT_H */