[deliverable/linux.git] / include / asm-sh / segment.h

#ifndef __ASM_SH_SEGMENT_H
#define __ASM_SH_SEGMENT_H

#ifndef __ASSEMBLY__

typedef struct {
	unsigned long seg;
} mm_segment_t;

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

/*
 * 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.
 */
#define KERNEL_DS	MAKE_MM_SEG(0xFFFFFFFFUL)
#ifdef CONFIG_MMU
#define USER_DS		MAKE_MM_SEG(PAGE_OFFSET)
#else
#define USER_DS		KERNEL_DS
#endif

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

#define get_ds()	(KERNEL_DS)

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

#endif /* __ASSEMBLY__ */
#endif /* __ASM_SH_SEGMENT_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef __ASM_SH_SEGMENT_H
	2	#define __ASM_SH_SEGMENT_H
	3
02f7e627	4	#ifndef __ASSEMBLY__
1da177e4	5
02f7e627 PM	6	typedef struct {
	7	unsigned long seg;
	8	} mm_segment_t;
	9
	10	#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) })
	11
	12	/*
	13	* The fs value determines whether argument validity checking should be
	14	* performed or not. If get_fs() == USER_DS, checking is performed, with
	15	* get_fs() == KERNEL_DS, checking is bypassed.
	16	*
	17	* For historical reasons, these macros are grossly misnamed.
	18	*/
	19	#define KERNEL_DS MAKE_MM_SEG(0xFFFFFFFFUL)
	20	#ifdef CONFIG_MMU
	21	#define USER_DS MAKE_MM_SEG(PAGE_OFFSET)
	22	#else
	23	#define USER_DS KERNEL_DS
	24	#endif
	25
	26	#define segment_eq(a,b) ((a).seg == (b).seg)
	27
	28	#define get_ds() (KERNEL_DS)
	29
	30	#define get_fs() (current_thread_info()->addr_limit)
	31	#define set_fs(x) (current_thread_info()->addr_limit = (x))
	32
	33	#endif /* __ASSEMBLY__ */
1da177e4	34	#endif /* __ASM_SH_SEGMENT_H */