LXR linux/arch/h8300/include/asm/segment.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _H8300_SEGMENT_H
   3#define _H8300_SEGMENT_H
   4
   5/* define constants */
   6#define USER_DATA     (1)
   7#ifndef __USER_DS
   8#define __USER_DS     (USER_DATA)
   9#endif
  10#define USER_PROGRAM  (2)
  11#define SUPER_DATA    (3)
  12#ifndef __KERNEL_DS
  13#define __KERNEL_DS   (SUPER_DATA)
  14#endif
  15#define SUPER_PROGRAM (4)
  16
  17#ifndef __ASSEMBLY__
  18
  19typedef struct {
  20        unsigned long seg;
  21} mm_segment_t;
  22
  23#define MAKE_MM_SEG(s)  ((mm_segment_t) { (s) })
  24#define USER_DS         MAKE_MM_SEG(__USER_DS)
  25#define KERNEL_DS       MAKE_MM_SEG(__KERNEL_DS)
  26
  27/*
  28 * Get/set the SFC/DFC registers for MOVES instructions
  29 */
  30
  31static inline mm_segment_t get_fs(void)
  32{
  33        return USER_DS;
  34}
  35
  36#define uaccess_kernel()        (get_fs().seg == KERNEL_DS.seg)
  37
  38#endif /* __ASSEMBLY__ */
  39
  40#endif /* _H8300_SEGMENT_H */
  41