417 lines
15 KiB
C
417 lines
15 KiB
C
/* $NetBSD: segments.h,v 1.22 2011/02/07 03:54:45 chs Exp $ */
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)segments.h 7.1 (Berkeley) 5/9/91
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*/
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/*-
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* Copyright (c) 1995, 1997
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* Charles M. Hannum. All rights reserved.
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* Copyright (c) 1989, 1990 William F. Jolitz
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)segments.h 7.1 (Berkeley) 5/9/91
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*/
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/*
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* Adapted for NetBSD/amd64 by fvdl@wasabisystems.com.
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*/
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/*
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* 386 Segmentation Data Structures and definitions
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* William F. Jolitz (william@ernie.berkeley.edu) 6/20/1989
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*/
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#ifndef _AMD64_SEGMENTS_H_
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#define _AMD64_SEGMENTS_H_
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#ifdef __x86_64__
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#ifdef _KERNEL_OPT
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#include "opt_xen.h"
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#endif
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/*
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* Selectors
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*/
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#define ISPL(s) ((s) & SEL_RPL) /* what is the priority level of a selector */
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#ifdef XEN
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#define SEL_KPL 3 /* kernel privilege level */
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#define SEL_XPL 0 /* Xen Hypervisor privilege level */
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#else
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#define SEL_KPL 0 /* kernel privilege level */
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#endif
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#define SEL_UPL 3 /* user privilege level */
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#define SEL_RPL 3 /* requester's privilege level mask */
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#define ISLDT(s) ((s) & SEL_LDT) /* is it local or global */
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#define SEL_LDT 4 /* local descriptor table */
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/* Dynamically allocated TSSs and LDTs start (byte offset) */
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#define SYSSEL_START (NGDT_MEM << 3)
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#define DYNSEL_START (SYSSEL_START + (NGDT_SYS << 4))
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/*
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* These define the index not from the start of the GDT, but from
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* the part of the GDT that they're allocated from.
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* First NGDT_MEM entries are 8-byte descriptors for CS and DS.
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* Next NGDT_SYS entries are 16-byte descriptors defining LDTs.
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*
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* The rest is 16-byte descriptors for TSS and LDT.
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*/
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#define IDXSEL(s) (((s) >> 3) & 0x1fff)
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#define IDXDYNSEL(s) ((((s) & ~SEL_RPL) - DYNSEL_START) >> 4)
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#define GSEL(s,r) (((s) << 3) | r)
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#define GSYSSEL(s,r) ((((s) << 4) + SYSSEL_START) | r)
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#define GDYNSEL(s,r) ((((s) << 4) + DYNSEL_START) | r | SEL_KPL)
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#define LSEL(s,r) ((s) | r | SEL_LDT)
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#define USERMODE(c, f) (ISPL(c) == SEL_UPL)
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#ifdef XEN
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/*
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* As KPL == UPL, Xen emulate interrupt in kernel context by pushing
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* a fake CS with XPL privilege
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*/
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#define KERNELMODE(c, f) (ISPL(c) == SEL_XPL)
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#else
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#define KERNELMODE(c, f) (ISPL(c) == SEL_KPL)
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#endif
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#ifndef _LOCORE
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/*
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* Memory and System segment descriptors
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*/
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/*
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* Below is used for TSS and LDT.
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*/
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struct sys_segment_descriptor {
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/*BITFIELDTYPE*/ uint64_t sd_lolimit:16;/* segment extent (lsb) */
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/*BITFIELDTYPE*/ uint64_t sd_lobase:24;/* segment base address (lsb) */
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/*BITFIELDTYPE*/ uint64_t sd_type:5; /* segment type */
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/*BITFIELDTYPE*/ uint64_t sd_dpl:2; /* segment descriptor priority level */
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/*BITFIELDTYPE*/ uint64_t sd_p:1; /* segment descriptor present */
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/*BITFIELDTYPE*/ uint64_t sd_hilimit:4;/* segment extent (msb) */
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/*BITFIELDTYPE*/ uint64_t sd_xx1:3; /* avl, long and def32 (not used) */
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/*BITFIELDTYPE*/ uint64_t sd_gran:1; /* limit granularity (byte/page) */
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/*BITFIELDTYPE*/ uint64_t sd_hibase:40;/* segment base address (msb) */
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/*BITFIELDTYPE*/ uint64_t sd_xx2:8; /* reserved */
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/*BITFIELDTYPE*/ uint64_t sd_zero:5; /* must be zero */
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/*BITFIELDTYPE*/ uint64_t sd_xx3:19; /* reserved */
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} __packed;
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/*
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* Below is used for cs, ds, etc.
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*/
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struct mem_segment_descriptor {
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unsigned sd_lolimit:16; /* segment extent (lsb) */
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unsigned sd_lobase:24; /* segment base address (lsb) */
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unsigned sd_type:5; /* segment type */
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unsigned sd_dpl:2; /* segment descriptor priority level */
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unsigned sd_p:1; /* segment descriptor present */
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unsigned sd_hilimit:4; /* segment extent (msb) */
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unsigned sd_avl:1; /* available */
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unsigned sd_long:1; /* long mode */
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unsigned sd_def32:1; /* default 32 vs 16 bit size */
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unsigned sd_gran:1; /* limit granularity (byte/page) */
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unsigned sd_hibase:8; /* segment base address (msb) */
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} __packed;
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/*
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* Common part of the above structures. Used to walk descriptor tables.
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*/
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struct common_segment_descriptor {
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unsigned sdc_lolimit:16;
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unsigned sdc_lobase:24;
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unsigned sdc_type:5;
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unsigned sdc_other:19;
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} __packed;
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/*
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* Gate descriptors (e.g. indirect descriptors)
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*/
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struct gate_descriptor {
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/*BITFIELDTYPE*/ uint64_t gd_looffset:16;/* gate offset (lsb) */
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/*BITFIELDTYPE*/ uint64_t gd_selector:16;/* gate segment selector */
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/*BITFIELDTYPE*/ uint64_t gd_ist:3; /* IST select */
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/*BITFIELDTYPE*/ uint64_t gd_xx1:5; /* reserved */
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/*BITFIELDTYPE*/ uint64_t gd_type:5; /* segment type */
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/*BITFIELDTYPE*/ uint64_t gd_dpl:2; /* segment descriptor priority level */
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/*BITFIELDTYPE*/ uint64_t gd_p:1; /* segment descriptor present */
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/*BITFIELDTYPE*/ uint64_t gd_hioffset:48;/* gate offset (msb) */
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/*BITFIELDTYPE*/ uint64_t gd_xx2:8; /* reserved */
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/*BITFIELDTYPE*/ uint64_t gd_zero:5; /* must be zero */
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/*BITFIELDTYPE*/ uint64_t gd_xx3:19; /* reserved */
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} __packed;
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/*
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* Generic descriptor
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*/
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union descriptor {
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struct mem_segment_descriptor sd;
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uint32_t raw[2];
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uint64_t raw64;
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} __packed;
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/*
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* region descriptors, used to load gdt/idt tables before segments yet exist.
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*/
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struct region_descriptor {
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uint16_t rd_limit; /* segment extent */
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uint64_t rd_base; /* base address */
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} __packed;
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#ifdef _KERNEL
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#if 0
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extern struct sys_segment_descriptor *ldt;
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#endif
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#ifdef XEN
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extern struct trap_info *idt;
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#else
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extern struct gate_descriptor *idt;
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#endif
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extern char *gdtstore;
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extern char *ldtstore;
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void setgate(struct gate_descriptor *, void *, int, int, int, int);
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void unsetgate(struct gate_descriptor *);
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void setregion(struct region_descriptor *, void *, uint16_t);
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void set_sys_segment(struct sys_segment_descriptor *, void *, size_t,
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int, int, int);
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void set_mem_segment(struct mem_segment_descriptor *, void *, size_t,
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int, int, int, int, int);
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void cpu_init_idt(void);
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void update_descriptor(void *, void *);
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#if !defined(XEN)
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void idt_init(void);
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void idt_vec_reserve(int);
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int idt_vec_alloc(int, int);
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void idt_vec_set(int, void (*)(void));
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void idt_vec_free(int);
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#endif
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struct lwp;
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int memseg_baseaddr(struct lwp *, uint64_t, char *, int, uint64_t *);
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int valid_user_selector(struct lwp *, uint64_t, char *, int);
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void cpu_fsgs_zero(struct lwp *);
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void cpu_fsgs_reload(struct lwp *, int, int);
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#endif /* _KERNEL */
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#endif /* !_LOCORE */
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/* system segments and gate types */
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#define SDT_SYSNULL 0 /* system null */
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#define SDT_SYS286TSS 1 /* system 286 TSS available */
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#define SDT_SYSLDT 2 /* system local descriptor table */
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#define SDT_SYS286BSY 3 /* system 286 TSS busy */
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#define SDT_SYS286CGT 4 /* system 286 call gate */
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#define SDT_SYSTASKGT 5 /* system task gate */
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#define SDT_SYS286IGT 6 /* system 286 interrupt gate */
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#define SDT_SYS286TGT 7 /* system 286 trap gate */
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#define SDT_SYSNULL2 8 /* system null again */
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#define SDT_SYS386TSS 9 /* system 386 TSS available */
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#define SDT_SYSNULL3 10 /* system null again */
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#define SDT_SYS386BSY 11 /* system 386 TSS busy */
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#define SDT_SYS386CGT 12 /* system 386 call gate */
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#define SDT_SYSNULL4 13 /* system null again */
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#define SDT_SYS386IGT 14 /* system 386 interrupt gate */
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#define SDT_SYS386TGT 15 /* system 386 trap gate */
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/* memory segment types */
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#define SDT_MEMRO 16 /* memory read only */
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#define SDT_MEMROA 17 /* memory read only accessed */
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#define SDT_MEMRW 18 /* memory read write */
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#define SDT_MEMRWA 19 /* memory read write accessed */
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#define SDT_MEMROD 20 /* memory read only expand dwn limit */
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#define SDT_MEMRODA 21 /* memory read only expand dwn limit accessed */
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#define SDT_MEMRWD 22 /* memory read write expand dwn limit */
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#define SDT_MEMRWDA 23 /* memory read write expand dwn limit acessed */
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#define SDT_MEME 24 /* memory execute only */
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#define SDT_MEMEA 25 /* memory execute only accessed */
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#define SDT_MEMER 26 /* memory execute read */
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#define SDT_MEMERA 27 /* memory execute read accessed */
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#define SDT_MEMEC 28 /* memory execute only conforming */
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#define SDT_MEMEAC 29 /* memory execute only accessed conforming */
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#define SDT_MEMERC 30 /* memory execute read conforming */
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#define SDT_MEMERAC 31 /* memory execute read accessed conforming */
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/* is memory segment descriptor pointer ? */
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#define ISMEMSDP(s) ((s->d_type) >= SDT_MEMRO && \
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(s->d_type) <= SDT_MEMERAC)
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/* is 286 gate descriptor pointer ? */
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#define IS286GDP(s) ((s->d_type) >= SDT_SYS286CGT && \
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(s->d_type) < SDT_SYS286TGT)
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/* is 386 gate descriptor pointer ? */
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#define IS386GDP(s) ((s->d_type) >= SDT_SYS386CGT && \
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(s->d_type) < SDT_SYS386TGT)
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/* is gate descriptor pointer ? */
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#define ISGDP(s) (IS286GDP(s) || IS386GDP(s))
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/* is segment descriptor pointer ? */
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#define ISSDP(s) (ISMEMSDP(s) || !ISGDP(s))
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/* is system segment descriptor pointer ? */
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#define ISSYSSDP(s) (!ISMEMSDP(s) && !ISGDP(s))
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/*
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* Segment Protection Exception code bits
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*/
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#define SEGEX_EXT 0x01 /* recursive or externally induced */
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#define SEGEX_IDT 0x02 /* interrupt descriptor table */
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#define SEGEX_TI 0x04 /* local descriptor table */
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/*
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* Entries in the Interrupt Descriptor Table (IDT)
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*/
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#define NIDT 256
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#define NRSVIDT 32 /* reserved entries for CPU exceptions */
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/*
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* Entries in the Global Descriptor Table (GDT)
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* The code and data descriptors must come first. There
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* are NGDT_MEM of them.
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*
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* Then come the predefined LDT (and possibly TSS) descriptors.
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* There are NGDT_SYS of them.
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*/
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#define GNULL_SEL 0 /* Null descriptor */
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#define GCODE_SEL 1 /* Kernel code descriptor */
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#define GDATA_SEL 2 /* Kernel data descriptor */
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#define GUCODE_SEL 3 /* User code descriptor */
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#define GUDATA_SEL 4 /* User data descriptor */
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#define GAPM32CODE_SEL 5
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#define GAPM16CODE_SEL 6
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#define GAPMDATA_SEL 7
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#define GBIOSCODE_SEL 8
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#define GBIOSDATA_SEL 9
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#define GPNPBIOSCODE_SEL 10
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#define GPNPBIOSDATA_SEL 11
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#define GPNPBIOSSCRATCH_SEL 12
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#define GPNPBIOSTRAMP_SEL 13
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#define GUCODE32_SEL 14
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#define GUDATA32_SEL 15
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#define GUFS_SEL 16 /* 32-bit Per-thread %fs */
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#define GUGS_SEL 17 /* 32-bit Per-thread %gs */
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#define NGDT_MEM 18
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#define GLDT_SEL 0 /* Default LDT descriptor */
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#define NGDT_SYS 1
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#define GDT_ADDR_MEM(s,i) \
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((struct mem_segment_descriptor *)((s) + ((i) << 3)))
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#define GDT_ADDR_SYS(s,i) \
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((struct sys_segment_descriptor *)((s) + (((i) << 4) + SYSSEL_START)))
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/*
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* Byte offsets in the Local Descriptor Table (LDT)
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* Strange order because of syscall/sysret insns
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*/
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#define LSYS5CALLS_SEL 0 /* iBCS system call gate */
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#define LUCODE32_SEL 8 /* 32 bit user code descriptor */
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#define LUDATA_SEL 16 /* User data descriptor */
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#define LUCODE_SEL 24 /* User code descriptor */
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#define LSOL26CALLS_SEL 32 /* Solaris 2.6 system call gate */
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#define LUDATA32_SEL 56 /* 32 bit user data descriptor (needed?)*/
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#define LBSDICALLS_SEL 128 /* BSDI system call gate */
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#define LDT_SIZE 144
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#define LSYSRETBASE_SEL LUCODE32_SEL
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/*
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* Checks for valid user selectors. If USER_LDT ever gets implemented
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* for amd64, these must check the ldt length and SEL_UPL if a user
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* ldt is active.
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*/
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#define VALID_USER_DSEL32(s) \
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(((s) & 0xffff) == GSEL(GUDATA32_SEL, SEL_UPL) || \
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((s) & 0xffff) == LSEL(LUDATA32_SEL, SEL_UPL))
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#define VALID_USER_CSEL32(s) \
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((s) == GSEL(GUCODE32_SEL, SEL_UPL) || (s) == LSEL(LUCODE32_SEL, SEL_UPL))
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#define VALID_USER_FSEL32(s) \
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(((s) & 0xffff) == GSEL(GUFS_SEL, SEL_UPL))
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#define VALID_USER_GSEL32(s) \
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(((s) & 0xffff) == GSEL(GUGS_SEL, SEL_UPL))
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#define VALID_USER_CSEL(s) \
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((s) == GSEL(GUCODE_SEL, SEL_UPL) || (s) == LSEL(LUCODE_SEL, SEL_UPL))
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#define VALID_USER_DSEL(s) \
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((s) == GSEL(GUDATA_SEL, SEL_UPL) || (s) == LSEL(LUDATA_SEL, SEL_UPL))
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#else /* __x86_64__ */
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#include <i386/segments.h>
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#endif /* __x86_64__ */
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#endif /* _AMD64_SEGMENTS_H_ */
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