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/*
* Mach Operating System
* Copyright (c) 1991,1990 Carnegie Mellon University
* Copyright (c) 1991 IBM Corporation
* Copyright (c) 1994 The University of Utah and
* the Computer Systems Laboratory (CSL).
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation,
* and that the name IBM not be used in advertising or publicity
* pertaining to distribution of the software without specific, written
* prior permission.
*
* CARNEGIE MELLON, IBM, AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON, IBM, AND CSL DISCLAIM ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
#ifndef _I386_GDT_
#define _I386_GDT_
#include "seg.h"
/*
* Kernel descriptors for Mach - 32-bit flat address space.
*/
#define KERNEL_CS (0x08 | KERNEL_RING) /* kernel code */
#define KERNEL_DS (0x10 | KERNEL_RING) /* kernel data */
#ifndef MACH_PV_DESCRIPTORS
#define KERNEL_LDT 0x18 /* master LDT */
#endif /* MACH_PV_DESCRIPTORS */
#define KERNEL_TSS 0x20 /* master TSS (uniprocessor) */
#define USER_LDT 0x28 /* place for per-thread LDT */
#define USER_TSS 0x30 /* place for per-thread TSS
that holds IO bitmap */
#ifndef MACH_PV_DESCRIPTORS
#define LINEAR_DS 0x38 /* linear mapping */
#endif /* MACH_PV_DESCRIPTORS */
/* 0x40 was USER_FPREGS, now free */
#define USER_GDT 0x48 /* user-defined GDT entries */
#define USER_GDT_SLOTS 2
#define GDTSZ (USER_GDT/8 + USER_GDT_SLOTS)
extern struct real_descriptor gdt[GDTSZ];
/* Fill a segment descriptor in the GDT. */
#define fill_gdt_descriptor(segment, base, limit, access, sizebits) \
fill_descriptor(&gdt[segment/8], base, limit, access, sizebits)
extern void gdt_init(void);
#endif /* _I386_GDT_ */
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