Release 4.14 arch/m68k/include/asm/segment.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _M68K_SEGMENT_H

#define _M68K_SEGMENT_H

/* define constants */
/* Address spaces (FC0-FC2) */

#define USER_DATA     (1)
#ifndef __USER_DS

#define __USER_DS     (USER_DATA)
#endif

#define USER_PROGRAM  (2)

#define SUPER_DATA    (5)
#ifndef __KERNEL_DS

#define __KERNEL_DS   (SUPER_DATA)
#endif

#define SUPER_PROGRAM (6)

#define CPU_SPACE     (7)

#ifndef __ASSEMBLY__

typedef struct {
	
unsigned long seg;

} mm_segment_t;


#define MAKE_MM_SEG(s)	((mm_segment_t) { (s) })

#ifdef CONFIG_CPU_HAS_ADDRESS_SPACES
/*
 * Get/set the SFC/DFC registers for MOVES instructions
 */

#define USER_DS		MAKE_MM_SEG(__USER_DS)

#define KERNEL_DS	MAKE_MM_SEG(__KERNEL_DS)



static inline mm_segment_t get_fs(void)
{
	mm_segment_t _v;
	__asm__ ("movec %/dfc,%0":"=r" (_v.seg):);
	return _v;
}

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static inline void set_fs(mm_segment_t val)
{
	__asm__ __volatile__ ("movec %0,%/sfc\n\t"
                              "movec %0,%/dfc\n\t"
                              : /* no outputs */ : "r" (val.seg) : "memory");
}

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static inline mm_segment_t get_ds(void)
{
    /* return the supervisor data space code */
    return KERNEL_DS;
}

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#else

#define USER_DS		MAKE_MM_SEG(TASK_SIZE)

#define KERNEL_DS	MAKE_MM_SEG(0xFFFFFFFF)

#define get_ds()	(KERNEL_DS)

#define get_fs()	(current_thread_info()->addr_limit)

#define set_fs(x)	(current_thread_info()->addr_limit = (x))
#endif


#define segment_eq(a, b) ((a).seg == (b).seg)

#endif /* __ASSEMBLY__ */

#endif /* _M68K_SEGMENT_H */
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Directory: arch/m68k/include/asm

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