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segment.h

/*
 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
 * Copyright (C) 2008-2009 PetaLogix
 * Copyright (C) 2006 Atmark Techno, Inc.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License. See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#ifndef _ASM_MICROBLAZE_SEGMENT_H
#define _ASM_MICROBLAZE_SEGMENT_H

# ifndef __ASSEMBLY__

typedef struct {
      unsigned long seg;
} mm_segment_t;

/*
 * On Microblaze the fs value is actually the top of the corresponding
 * address space.
 *
 * The fs value determines whether argument validity checking should be
 * performed or not. If get_fs() == USER_DS, checking is performed, with
 * get_fs() == KERNEL_DS, checking is bypassed.
 *
 * For historical reasons, these macros are grossly misnamed.
 *
 * For non-MMU arch like Microblaze, KERNEL_DS and USER_DS is equal.
 */
# define MAKE_MM_SEG(s)       ((mm_segment_t) { (s) })

#  ifndef CONFIG_MMU
#  define KERNEL_DS     MAKE_MM_SEG(0)
#  define USER_DS KERNEL_DS
#  else
#  define KERNEL_DS     MAKE_MM_SEG(0xFFFFFFFF)
#  define USER_DS MAKE_MM_SEG(TASK_SIZE - 1)
#  endif

# define get_ds() (KERNEL_DS)
# define get_fs() (current_thread_info()->addr_limit)
# define set_fs(val)    (current_thread_info()->addr_limit = (val))

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

# endif /* __ASSEMBLY__ */
#endif /* _ASM_MICROBLAZE_SEGMENT_H */

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