user_ldt.h   [plain text]


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/* 
 * Mach Operating System
 * Copyright (c) 1991 Carnegie Mellon University
 * All Rights Reserved.
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/*
 */

#ifndef	_I386_USER_LDT_H_
#define	_I386_USER_LDT_H_

/*
 * User LDT management.
 *
 * Each task may have its own LDT.
 */

#define	LDT_AUTO_ALLOC	0xffffffff

#ifdef KERNEL
#include <i386/seg.h>

struct user_ldt {
	unsigned int start;		/* first descriptor in table */
	unsigned int count;		/* how many descriptors in table */
	struct real_descriptor	ldt[0];	/* descriptor table (variable) */
};
typedef struct user_ldt *	user_ldt_t;

extern user_ldt_t	user_ldt_copy(
			user_ldt_t	uldt);
extern void	user_ldt_free(
			user_ldt_t	uldt);
extern void	user_ldt_set(
			thread_t	thread);
#else /* !KERNEL */
#include <sys/cdefs.h>

union ldt_entry;

__BEGIN_DECLS
int i386_get_ldt(int, union ldt_entry *, int);
int i386_set_ldt(int, const union ldt_entry *, int);
__END_DECLS
#endif /* KERNEL */

#endif	/* _I386_USER_LDT_H_ */