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

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef __ASM_SH_SEGMENT_H
   3#define __ASM_SH_SEGMENT_H
   4
   5#ifndef __ASSEMBLY__
   6
   7typedef struct {
   8        unsigned long seg;
   9} mm_segment_t;
  10
  11#define MAKE_MM_SEG(s)  ((mm_segment_t) { (s) })
  12
  13/*
  14 * The fs value determines whether argument validity checking should be
  15 * performed or not.  If get_fs() == USER_DS, checking is performed, with
  16 * get_fs() == KERNEL_DS, checking is bypassed.
  17 *
  18 * For historical reasons, these macros are grossly misnamed.
  19 */
  20#define KERNEL_DS       MAKE_MM_SEG(0xFFFFFFFFUL)
  21#ifdef CONFIG_MMU
  22#define USER_DS         MAKE_MM_SEG(PAGE_OFFSET)
  23#else
  24#define USER_DS         KERNEL_DS
  25#endif
  26
  27#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg)
  28
  29#define get_fs()        (current_thread_info()->addr_limit)
  30#define set_fs(x)       (current_thread_info()->addr_limit = (x))
  31
  32#endif /* __ASSEMBLY__ */
  33#endif /* __ASM_SH_SEGMENT_H */
  34