/*

* Copyright 2007 Sun Microsystems, Inc. All rights reserved.

* Use is subject to license terms.

*/

#ifndef _SYS_SEGMENTS_H

#define _SYS_SEGMENTS_H

//#pragma ident "@(#)segments.h 1.11 07/11/06 SMI"

#ifdef __cplusplus

extern "C" {

#endif

/*

* Copyright (c) 1989, 1990 William F. Jolitz

* Copyright (c) 1990 The Regents of the University of California.

* All rights reserved.

*

* This code is derived from software contributed to Berkeley by

* William Jolitz.

*

* Redistribution and use in source and binary forms, with or without

* modification, are permitted provided that the following conditions

* are met:

* 1. Redistributions of source code must retain the above copyright

* notice, this list of conditions and the following disclaimer.

* 2. Redistributions in binary form must reproduce the above copyright

* notice, this list of conditions and the following disclaimer in the

* documentation and/or other materials provided with the distribution.

* 3. All advertising materials mentioning features or use of this software

* must display the following acknowledgement:

* This product includes software developed by the University of

* California, Berkeley and its contributors.

* 4. Neither the name of the University nor the names of its contributors

* may be used to endorse or promote products derived from this software

* without specific prior written permission.

*

* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

* SUCH DAMAGE.

*

* from: @(#)segments.h 7.1 (Berkeley) 5/9/91

* $FreeBSD: src/sys/i386/include/segments.h,v 1.34 2003/09/10 01:07:04

* jhb Exp $

*

* 386 Segmentation Data Structures and definitions

* William F. Jolitz (william@ernie.berkeley.edu) 6/20/1989

*/

/*

* User segment descriptors (code and data).

* Legacy mode 64-bits wide.

*/

# if 0 /* only needed by fasttrap_isa.c */

typedef struct user_desc {

uint32_t usd_lolimit:16; /* segment limit 15:0 */

uint32_t usd_lobase:16; /* segment base 15:0 */

uint32_t usd_midbase:8; /* segment base 23:16 */

uint32_t usd_type:5; /* segment type, includes S bit */

uint32_t usd_dpl:2; /* segment descriptor priority level */

uint32_t usd_p:1; /* segment descriptor present */

uint32_t usd_hilimit:4; /* segment limit 19:16 */

uint32_t usd_avl:1; /* available to sw, but not used */

uint32_t usd_reserved:1; /* unused, ignored */

uint32_t usd_def32:1; /* default 32 vs 16 bit operand */

uint32_t usd_gran:1; /* limit units (bytes vs pages) */

uint32_t usd_hibase:8; /* segment base 31:24 */

} user_desc_t;

#endif

#define SELTOIDX(s) ((s) >> 3) /* selector to index */

#define SEL_UPL 3 /* user priority level */

#define TRP_UPL 3 /* system gate priv (user allowed) */

#define SEL_TI_LDT 4 /* local descriptor table */

#define SEL_LDT(s) (IDXTOSEL(s) | SEL_TI_LDT | SEL_UPL) /* local sel */

#define CPL_MASK 3 /* RPL mask for selector */

#define SELISLDT(s) (((s) & SEL_TI_LDT) == SEL_TI_LDT)

#define SELISUPL(s) (((s) & CPL_MASK) == SEL_UPL)

#ifdef __cplusplus

}

#endif

# endif /* _SYS_SEGMENTS_H */