LXR linux/arch/m68k/include/asm/segment.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _M68K_SEGMENT_H
   3#define _M68K_SEGMENT_H
   4
   5/* define constants */
   6/* Address spaces (FC0-FC2) */
   7#define USER_DATA     (1)
   8#ifndef __USER_DS
   9#define __USER_DS     (USER_DATA)
  10#endif
  11#define USER_PROGRAM  (2)
  12#define SUPER_DATA    (5)
  13#ifndef __KERNEL_DS
  14#define __KERNEL_DS   (SUPER_DATA)
  15#endif
  16#define SUPER_PROGRAM (6)
  17#define CPU_SPACE     (7)
  18
  19#ifndef __ASSEMBLY__
  20
  21typedef struct {
  22        unsigned long seg;
  23} mm_segment_t;
  24
  25#define MAKE_MM_SEG(s)  ((mm_segment_t) { (s) })
  26
  27#ifdef CONFIG_CPU_HAS_ADDRESS_SPACES
  28/*
  29 * Get/set the SFC/DFC registers for MOVES instructions
  30 */
  31#define USER_DS         MAKE_MM_SEG(__USER_DS)
  32#define KERNEL_DS       MAKE_MM_SEG(__KERNEL_DS)
  33
  34static inline mm_segment_t get_fs(void)
  35{
  36        mm_segment_t _v;
  37        __asm__ ("movec %/dfc,%0":"=r" (_v.seg):);
  38        return _v;
  39}
  40
  41static inline void set_fs(mm_segment_t val)
  42{
  43        __asm__ __volatile__ ("movec %0,%/sfc\n\t"
  44                              "movec %0,%/dfc\n\t"
  45                              : /* no outputs */ : "r" (val.seg) : "memory");
  46}
  47
  48#else
  49#define USER_DS         MAKE_MM_SEG(TASK_SIZE)
  50#define KERNEL_DS       MAKE_MM_SEG(0xFFFFFFFF)
  51#define get_fs()        (current_thread_info()->addr_limit)
  52#define set_fs(x)       (current_thread_info()->addr_limit = (x))
  53#endif
  54
  55#define segment_eq(a, b) ((a).seg == (b).seg)
  56
  57#endif /* __ASSEMBLY__ */
  58
  59#endif /* _M68K_SEGMENT_H */
  60