Fix the VKERNEL/VKERNEL64 build.
[dragonfly.git] / sys / cpu / i386 / include / segments.h
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1/*-
2 * Copyright (c) 1989, 1990 William F. Jolitz
3 * Copyright (c) 1990 The Regents of the University of California.
4 * All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * William Jolitz.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 * from: @(#)segments.h 7.1 (Berkeley) 5/9/91
38 * $FreeBSD: src/sys/i386/include/segments.h,v 1.24 1999/12/29 04:33:07 peter Exp $
39 */
40
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41#ifndef _CPU_SEGMENTS_H_
42#define _CPU_SEGMENTS_H_
984263bc 43
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44/*
45 * 386 Segmentation Data Structures and definitions
46 * William F. Jolitz (william@ernie.berkeley.edu) 6/20/1989
47 */
48
49/*
50 * Selectors
51 */
52
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53#define SEL_RPL_MASK 0x0003
54
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55#define ISPL(s) ((s)&3) /* what is the priority level of a selector */
56#define SEL_KPL 0 /* kernel priority level */
57#define SEL_UPL 3 /* user priority level */
58#define ISLDT(s) ((s)&SEL_LDT) /* is it local or global */
59#define SEL_LDT 4 /* local descriptor table */
60#define IDXSEL(s) (((s)>>3) & 0x1fff) /* index of selector */
61#define LSEL(s,r) (((s)<<3) | SEL_LDT | r) /* a local selector */
62#define GSEL(s,r) (((s)<<3) | r) /* a global selector */
63
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64#ifndef LOCORE
65
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66/*
67 * Memory and System segment descriptors
68 */
69struct segment_descriptor {
70 unsigned sd_lolimit:16 ; /* segment extent (lsb) */
71 unsigned sd_lobase:24 __attribute__ ((packed));
72 /* segment base address (lsb) */
73 unsigned sd_type:5 ; /* segment type */
74 unsigned sd_dpl:2 ; /* segment descriptor priority level */
75 unsigned sd_p:1 ; /* segment descriptor present */
76 unsigned sd_hilimit:4 ; /* segment extent (msb) */
77 unsigned sd_xx:2 ; /* unused */
78 unsigned sd_def32:1 ; /* default 32 vs 16 bit size */
79 unsigned sd_gran:1 ; /* limit granularity (byte/page units)*/
80 unsigned sd_hibase:8 ; /* segment base address (msb) */
81} ;
82
83/*
84 * Gate descriptors (e.g. indirect descriptors)
85 */
86struct gate_descriptor {
87 unsigned gd_looffset:16 ; /* gate offset (lsb) */
88 unsigned gd_selector:16 ; /* gate segment selector */
89 unsigned gd_stkcpy:5 ; /* number of stack wds to cpy */
90 unsigned gd_xx:3 ; /* unused */
91 unsigned gd_type:5 ; /* segment type */
92 unsigned gd_dpl:2 ; /* segment descriptor priority level */
93 unsigned gd_p:1 ; /* segment descriptor present */
94 unsigned gd_hioffset:16 ; /* gate offset (msb) */
95} ;
96
97/*
98 * Generic descriptor
99 */
100union descriptor {
101 struct segment_descriptor sd;
102 struct gate_descriptor gd;
103};
104
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105#endif
106
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107 /* system segments and gate types */
108#define SDT_SYSNULL 0 /* system null */
109#define SDT_SYS286TSS 1 /* system 286 TSS available */
110#define SDT_SYSLDT 2 /* system local descriptor table */
111#define SDT_SYS286BSY 3 /* system 286 TSS busy */
112#define SDT_SYS286CGT 4 /* system 286 call gate */
113#define SDT_SYSTASKGT 5 /* system task gate */
114#define SDT_SYS286IGT 6 /* system 286 interrupt gate */
115#define SDT_SYS286TGT 7 /* system 286 trap gate */
116#define SDT_SYSNULL2 8 /* system null again */
117#define SDT_SYS386TSS 9 /* system 386 TSS available */
118#define SDT_SYSNULL3 10 /* system null again */
119#define SDT_SYS386BSY 11 /* system 386 TSS busy */
120#define SDT_SYS386CGT 12 /* system 386 call gate */
121#define SDT_SYSNULL4 13 /* system null again */
122#define SDT_SYS386IGT 14 /* system 386 interrupt gate */
123#define SDT_SYS386TGT 15 /* system 386 trap gate */
124
125 /* memory segment types */
126#define SDT_MEMRO 16 /* memory read only */
127#define SDT_MEMROA 17 /* memory read only accessed */
128#define SDT_MEMRW 18 /* memory read write */
129#define SDT_MEMRWA 19 /* memory read write accessed */
130#define SDT_MEMROD 20 /* memory read only expand dwn limit */
131#define SDT_MEMRODA 21 /* memory read only expand dwn limit accessed */
132#define SDT_MEMRWD 22 /* memory read write expand dwn limit */
133#define SDT_MEMRWDA 23 /* memory read write expand dwn limit accessed */
134#define SDT_MEME 24 /* memory execute only */
135#define SDT_MEMEA 25 /* memory execute only accessed */
136#define SDT_MEMER 26 /* memory execute read */
137#define SDT_MEMERA 27 /* memory execute read accessed */
138#define SDT_MEMEC 28 /* memory execute only conforming */
139#define SDT_MEMEAC 29 /* memory execute only accessed conforming */
140#define SDT_MEMERC 30 /* memory execute read conforming */
141#define SDT_MEMERAC 31 /* memory execute read accessed conforming */
142
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143#ifndef LOCORE
144
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145/* is memory segment descriptor pointer ? */
146#define ISMEMSDP(s) ((s->d_type) >= SDT_MEMRO && (s->d_type) <= SDT_MEMERAC)
147
148/* is 286 gate descriptor pointer ? */
149#define IS286GDP(s) (((s->d_type) >= SDT_SYS286CGT \
150 && (s->d_type) < SDT_SYS286TGT))
151
152/* is 386 gate descriptor pointer ? */
153#define IS386GDP(s) (((s->d_type) >= SDT_SYS386CGT \
154 && (s->d_type) < SDT_SYS386TGT))
155
156/* is gate descriptor pointer ? */
157#define ISGDP(s) (IS286GDP(s) || IS386GDP(s))
158
159/* is segment descriptor pointer ? */
160#define ISSDP(s) (ISMEMSDP(s) || !ISGDP(s))
161
162/* is system segment descriptor pointer ? */
163#define ISSYSSDP(s) (!ISMEMSDP(s) && !ISGDP(s))
164
165/*
166 * Software definitions are in this convenient format,
167 * which are translated into inconvenient segment descriptors
168 * when needed to be used by the 386 hardware
169 */
170
171struct soft_segment_descriptor {
172 unsigned ssd_base ; /* segment base address */
173 unsigned ssd_limit ; /* segment extent */
174 unsigned ssd_type:5 ; /* segment type */
175 unsigned ssd_dpl:2 ; /* segment descriptor priority level */
176 unsigned ssd_p:1 ; /* segment descriptor present */
177 unsigned ssd_xx:4 ; /* unused */
178 unsigned ssd_xx1:2 ; /* unused */
179 unsigned ssd_def32:1 ; /* default 32 vs 16 bit size */
180 unsigned ssd_gran:1 ; /* limit granularity (byte/page units)*/
181};
182
183/*
184 * region descriptors, used to load gdt/idt tables before segments yet exist.
185 */
186struct region_descriptor {
187 unsigned rd_limit:16; /* segment extent */
188 unsigned rd_base:32 __attribute__ ((packed)); /* base address */
189};
190
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191#endif
192
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193/*
194 * Segment Protection Exception code bits
195 */
196
197#define SEGEX_EXT 0x01 /* recursive or externally induced */
198#define SEGEX_IDT 0x02 /* interrupt descriptor table */
199#define SEGEX_TI 0x04 /* local descriptor table */
200 /* other bits are affected descriptor index */
81c02e76 201#define SEGEX_IDX(s) (((s)>>3)&0x1fff)
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202
203/*
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204 * Size of IDT table. Theoretically we only need to cover past 0x81
205 * (NIDT=130) if not running APIC_IO or SMP, but at this point we might
206 * as well just use all of them.
984263bc 207 */
984263bc 208#define NIDT 256 /* we use them all */
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209
210/*
211 * Entries in the Global Descriptor Table (GDT)
212 */
213#define GNULL_SEL 0 /* Null Descriptor */
214#define GCODE_SEL 1 /* Kernel Code Descriptor */
215#define GDATA_SEL 2 /* Kernel Data Descriptor */
216#define GPRIV_SEL 3 /* SMP Per-Processor Private Data */
217#define GPROC0_SEL 4 /* Task state process slot zero and up */
218#define GLDT_SEL 5 /* LDT - eventually one per process */
219#define GUSERLDT_SEL 6 /* User LDT */
220#define GTGATE_SEL 7 /* Process task switch gate */
221#define GBIOSLOWMEM_SEL 8 /* BIOS low memory access (must be entry 8) */
222#define GPANIC_SEL 9 /* Task state to consider panic from */
223#define GBIOSCODE32_SEL 10 /* BIOS interface (32bit Code) */
224#define GBIOSCODE16_SEL 11 /* BIOS interface (16bit Code) */
225#define GBIOSDATA_SEL 12 /* BIOS interface (Data) */
226#define GBIOSUTIL_SEL 13 /* BIOS interface (Utility) */
227#define GBIOSARGS_SEL 14 /* BIOS interface (Arguments) */
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228#define GTLS_START 15 /* Thread TLS Descriptor */
229#define GTLS_END 17 /* Thread TLS Descriptor */
efba76b4 230#define GNDIS_SEL 18 /* For the NDIS layer */
984263bc 231
806bf111 232#define NGTLS (GTLS_END - GTLS_START + 1)
984263bc 233#ifdef BDE_DEBUGGER
806bf111 234#define NGDT 21 /* some of 11-17 are reserved for debugger */
984263bc 235#else
efba76b4 236#define NGDT 19
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237#endif
238
239/*
240 * Entries in the Local Descriptor Table (LDT)
241 */
242#define LSYS5CALLS_SEL 0 /* forced by intel BCS */
243#define LSYS5SIGR_SEL 1
244#define L43BSDCALLS_SEL 2 /* notyet */
245#define LUCODE_SEL 3
246#define LSOL26CALLS_SEL 4 /* Solaris >= 2.6 system call gate */
247#define LUDATA_SEL 5
248/* separate stack, es,fs,gs sels ? */
249/* #define LPOSIXCALLS_SEL 5*/ /* notyet */
250#define LBSDICALLS_SEL 16 /* BSDI system call gate */
251#define NLDT (LBSDICALLS_SEL + 1)
252
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253#ifndef LOCORE
254
255struct savetls {
256 struct segment_descriptor tls[NGTLS];
257};
258
259#endif
260
bdc560a1 261#if defined(_KERNEL) && !defined(LOCORE)
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262
263#ifndef _SYS_TYPES_H_
264#include <sys/types.h>
265#endif
266
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267extern int _default_ldt;
268extern union descriptor gdt[];
269extern struct soft_segment_descriptor gdt_segs[];
270extern struct gate_descriptor *idt;
271extern union descriptor ldt[NLDT];
7773e565 272extern struct mtx dt_lock;
984263bc 273
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274void lgdt (struct region_descriptor *rdp);
275void lidt (struct region_descriptor *rdp);
276void lldt (u_short sel);
277void sdtossd (struct segment_descriptor *sdp,
278 struct soft_segment_descriptor *ssdp);
279void ssdtosd (struct soft_segment_descriptor *ssdp,
280 struct segment_descriptor *sdp);
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281#endif /* _KERNEL */
282
a9295349 283#endif /* !_CPU_SEGMENTS_H_ */