Annotation of sys/arch/amd64/include/segments.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: segments.h,v 1.4 2005/12/13 00:18:19 jsg Exp $ */
2: /* $NetBSD: segments.h,v 1.1 2003/04/26 18:39:47 fvdl Exp $ */
3:
4: /*-
5: * Copyright (c) 1995, 1997
6: * Charles M. Hannum. All rights reserved.
7: * Copyright (c) 1989, 1990 William F. Jolitz
8: * Copyright (c) 1990 The Regents of the University of California.
9: * All rights reserved.
10: *
11: * This code is derived from software contributed to Berkeley by
12: * William Jolitz.
13: *
14: * Redistribution and use in source and binary forms, with or without
15: * modification, are permitted provided that the following conditions
16: * are met:
17: * 1. Redistributions of source code must retain the above copyright
18: * notice, this list of conditions and the following disclaimer.
19: * 2. Redistributions in binary form must reproduce the above copyright
20: * notice, this list of conditions and the following disclaimer in the
21: * documentation and/or other materials provided with the distribution.
22: * 3. Neither the name of the University nor the names of its contributors
23: * may be used to endorse or promote products derived from this software
24: * without specific prior written permission.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36: * SUCH DAMAGE.
37: *
38: * @(#)segments.h 7.1 (Berkeley) 5/9/91
39: */
40:
41: /*
42: * Adapted for NetBSD/amd64 by fvdl@wasabisystems.com.
43: */
44:
45: /*
46: * 386 Segmentation Data Structures and definitions
47: * William F. Jolitz (william@ernie.berkeley.edu) 6/20/1989
48: */
49:
50: #ifndef _AMD64_SEGMENTS_H_
51: #define _AMD64_SEGMENTS_H_
52:
53: /*
54: * Selectors
55: */
56:
57: #define ISPL(s) ((s) & SEL_RPL) /* what is the priority level of a selector */
58: #define SEL_KPL 0 /* kernel privilege level */
59: #define SEL_UPL 3 /* user privilege level */
60: #define SEL_RPL 3 /* requester's privilege level mask */
61: #define ISLDT(s) ((s) & SEL_LDT) /* is it local or global */
62: #define SEL_LDT 4 /* local descriptor table */
63:
64: /* Dynamically allocated TSSs and LDTs start (byte offset) */
65: #define SYSSEL_START (NGDT_MEM << 3)
66: #define DYNSEL_START (SYSSEL_START + (NGDT_SYS << 4))
67:
68: /*
69: * These define the index not from the start of the GDT, but from
70: * the part of the GDT that they're allocated from.
71: * First NGDT_MEM entries are 8-byte descriptors for CS and DS.
72: * Next NGDT_SYS entries are 16-byte descriptors defining LDTs.
73: *
74: * The rest is 16-byte descriptors for TSS and LDT.
75: */
76:
77: #define IDXSEL(s) (((s) >> 3) & 0x1fff)
78: #define IDXDYNSEL(s) ((((s) & ~SEL_RPL) - DYNSEL_START) >> 4)
79:
80: #define GSEL(s,r) (((s) << 3) | r)
81: #define GSYSSEL(s,r) ((((s) << 4) + SYSSEL_START) | r)
82: #define GDYNSEL(s,r) ((((s) << 4) + DYNSEL_START) | r | SEL_KPL)
83:
84: #define LSEL(s,r) ((s) | r | SEL_LDT)
85:
86: #define USERMODE(c, f) (ISPL(c) == SEL_UPL)
87: #define KERNELMODE(c, f) (ISPL(c) == SEL_KPL)
88:
89: #ifndef _LOCORE
90:
91: /*
92: * Memory and System segment descriptors
93: */
94:
95: /*
96: * Below is used for TSS and LDT.
97: */
98: struct sys_segment_descriptor {
99: /*BITFIELDTYPE*/ u_int64_t sd_lolimit:16;/* segment extent (lsb) */
100: /*BITFIELDTYPE*/ u_int64_t sd_lobase:24;/* segment base address (lsb) */
101: /*BITFIELDTYPE*/ u_int64_t sd_type:5; /* segment type */
102: /*BITFIELDTYPE*/ u_int64_t sd_dpl:2; /* segment descriptor priority level */
103: /*BITFIELDTYPE*/ u_int64_t sd_p:1; /* segment descriptor present */
104: /*BITFIELDTYPE*/ u_int64_t sd_hilimit:4;/* segment extent (msb) */
105: /*BITFIELDTYPE*/ u_int64_t sd_xx1:3; /* avl, long and def32 (not used) */
106: /*BITFIELDTYPE*/ u_int64_t sd_gran:1; /* limit granularity (byte/page) */
107: /*BITFIELDTYPE*/ u_int64_t sd_hibase:40;/* segment base address (msb) */
108: /*BITFIELDTYPE*/ u_int64_t sd_xx2:8; /* reserved */
109: /*BITFIELDTYPE*/ u_int64_t sd_zero:5; /* must be zero */
110: /*BITFIELDTYPE*/ u_int64_t sd_xx3:19; /* reserved */
111: } __attribute__((packed));
112:
113: /*
114: * Below is used for cs, ds, etc.
115: */
116: struct mem_segment_descriptor {
117: unsigned int sd_lolimit:16; /* segment extent (lsb) */
118: unsigned int sd_lobase:24; /* segment base address (lsb) */
119: unsigned int sd_type:5; /* segment type */
120: unsigned int sd_dpl:2; /* segment descriptor priority level */
121: unsigned int sd_p:1; /* segment descriptor present */
122: unsigned int sd_hilimit:4; /* segment extent (msb) */
123: unsigned int sd_avl:1; /* available */
124: unsigned int sd_long:1; /* long mode */
125: unsigned int sd_def32:1; /* default 32 vs 16 bit size */
126: unsigned int sd_gran:1; /* limit granularity (byte/page) */
127: unsigned int sd_hibase:8; /* segment base address (msb) */
128: } __attribute__((packed));
129:
130: /*
131: * Gate descriptors (e.g. indirect descriptors)
132: */
133: struct gate_descriptor {
134: /*BITFIELDTYPE*/ u_int64_t gd_looffset:16;/* gate offset (lsb) */
135: /*BITFIELDTYPE*/ u_int64_t gd_selector:16;/* gate segment selector */
136: /*BITFIELDTYPE*/ u_int64_t gd_ist:3; /* IST select */
137: /*BITFIELDTYPE*/ u_int64_t gd_xx1:5; /* reserved */
138: /*BITFIELDTYPE*/ u_int64_t gd_type:5; /* segment type */
139: /*BITFIELDTYPE*/ u_int64_t gd_dpl:2; /* segment descriptor priority level */
140: /*BITFIELDTYPE*/ u_int64_t gd_p:1; /* segment descriptor present */
141: /*BITFIELDTYPE*/ u_int64_t gd_hioffset:48;/* gate offset (msb) */
142: /*BITFIELDTYPE*/ u_int64_t gd_xx2:8; /* reserved */
143: /*BITFIELDTYPE*/ u_int64_t gd_zero:5; /* must be zero */
144: /*BITFIELDTYPE*/ u_int64_t gd_xx3:19; /* reserved */
145: } __attribute__((packed));
146:
147: /*
148: * region descriptors, used to load gdt/idt tables before segments yet exist.
149: */
150: struct region_descriptor {
151: u_int16_t rd_limit; /* segment extent */
152: u_int64_t rd_base; /* base address */
153: } __attribute__((packed));
154:
155: #ifdef _KERNEL
156: #if 0
157: extern struct sys_segment_descriptor *ldt;
158: #endif
159: extern struct gate_descriptor *idt;
160: extern char *gdtstore;
161: extern char *ldtstore;
162:
163: void setgate(struct gate_descriptor *, void *, int, int, int, int);
164: void unsetgate(struct gate_descriptor *);
165: void setregion(struct region_descriptor *, void *, u_int16_t);
166: void set_sys_segment(struct sys_segment_descriptor *, void *, size_t,
167: int, int, int);
168: void set_mem_segment(struct mem_segment_descriptor *, void *, size_t,
169: int, int, int, int, int);
170: int idt_vec_alloc(int, int);
171: void idt_vec_set(int, void (*)(void));
172: void idt_vec_free(int);
173: void cpu_init_idt(void);
174:
175: #endif /* _KERNEL */
176:
177: #endif /* !_LOCORE */
178:
179: /* system segments and gate types */
180: #define SDT_SYSNULL 0 /* system null */
181: #define SDT_SYS286TSS 1 /* system 286 TSS available */
182: #define SDT_SYSLDT 2 /* system local descriptor table */
183: #define SDT_SYS286BSY 3 /* system 286 TSS busy */
184: #define SDT_SYS286CGT 4 /* system 286 call gate */
185: #define SDT_SYSTASKGT 5 /* system task gate */
186: #define SDT_SYS286IGT 6 /* system 286 interrupt gate */
187: #define SDT_SYS286TGT 7 /* system 286 trap gate */
188: #define SDT_SYSNULL2 8 /* system null again */
189: #define SDT_SYS386TSS 9 /* system 386 TSS available */
190: #define SDT_SYSNULL3 10 /* system null again */
191: #define SDT_SYS386BSY 11 /* system 386 TSS busy */
192: #define SDT_SYS386CGT 12 /* system 386 call gate */
193: #define SDT_SYSNULL4 13 /* system null again */
194: #define SDT_SYS386IGT 14 /* system 386 interrupt gate */
195: #define SDT_SYS386TGT 15 /* system 386 trap gate */
196:
197: /* memory segment types */
198: #define SDT_MEMRO 16 /* memory read only */
199: #define SDT_MEMROA 17 /* memory read only accessed */
200: #define SDT_MEMRW 18 /* memory read write */
201: #define SDT_MEMRWA 19 /* memory read write accessed */
202: #define SDT_MEMROD 20 /* memory read only expand dwn limit */
203: #define SDT_MEMRODA 21 /* memory read only expand dwn limit accessed */
204: #define SDT_MEMRWD 22 /* memory read write expand dwn limit */
205: #define SDT_MEMRWDA 23 /* memory read write expand dwn limit acessed */
206: #define SDT_MEME 24 /* memory execute only */
207: #define SDT_MEMEA 25 /* memory execute only accessed */
208: #define SDT_MEMER 26 /* memory execute read */
209: #define SDT_MEMERA 27 /* memory execute read accessed */
210: #define SDT_MEMEC 28 /* memory execute only conforming */
211: #define SDT_MEMEAC 29 /* memory execute only accessed conforming */
212: #define SDT_MEMERC 30 /* memory execute read conforming */
213: #define SDT_MEMERAC 31 /* memory execute read accessed conforming */
214:
215: /* is memory segment descriptor pointer ? */
216: #define ISMEMSDP(s) ((s->d_type) >= SDT_MEMRO && \
217: (s->d_type) <= SDT_MEMERAC)
218:
219: /* is 286 gate descriptor pointer ? */
220: #define IS286GDP(s) ((s->d_type) >= SDT_SYS286CGT && \
221: (s->d_type) < SDT_SYS286TGT)
222:
223: /* is 386 gate descriptor pointer ? */
224: #define IS386GDP(s) ((s->d_type) >= SDT_SYS386CGT && \
225: (s->d_type) < SDT_SYS386TGT)
226:
227: /* is gate descriptor pointer ? */
228: #define ISGDP(s) (IS286GDP(s) || IS386GDP(s))
229:
230: /* is segment descriptor pointer ? */
231: #define ISSDP(s) (ISMEMSDP(s) || !ISGDP(s))
232:
233: /* is system segment descriptor pointer ? */
234: #define ISSYSSDP(s) (!ISMEMSDP(s) && !ISGDP(s))
235:
236: /*
237: * Segment Protection Exception code bits
238: */
239: #define SEGEX_EXT 0x01 /* recursive or externally induced */
240: #define SEGEX_IDT 0x02 /* interrupt descriptor table */
241: #define SEGEX_TI 0x04 /* local descriptor table */
242:
243: /*
244: * Entries in the Interrupt Descriptor Table (IDT)
245: */
246: #define NIDT 256
247: #define NRSVIDT 32 /* reserved entries for cpu exceptions */
248:
249: /*
250: * Entries in the Global Descriptor Table (GDT)
251: * The code and data descriptors must come first. There
252: * are NGDT_MEM of them.
253: *
254: * Then come the predefined LDT (and possibly TSS) descriptors.
255: * There are NGDT_SYS of them.
256: */
257: #define GNULL_SEL 0 /* Null descriptor */
258: #define GCODE_SEL 1 /* Kernel code descriptor */
259: #define GDATA_SEL 2 /* Kernel data descriptor */
260: #define GUCODE_SEL 3 /* User code descriptor */
261: #define GUDATA_SEL 4 /* User data descriptor */
262: #define GAPM32CODE_SEL 5
263: #define GAPM16CODE_SEL 6
264: #define GAPMDATA_SEL 7
265: #define GBIOSCODE_SEL 8
266: #define GBIOSDATA_SEL 9
267: #define GPNPBIOSCODE_SEL 10
268: #define GPNPBIOSDATA_SEL 11
269: #define GPNPBIOSSCRATCH_SEL 12
270: #define GPNPBIOSTRAMP_SEL 13
271: #define GUCODE32_SEL 14
272: #define GUDATA32_SEL 15
273: #define NGDT_MEM 16
274:
275: #define GLDT_SEL 0 /* Default LDT descriptor */
276: #define NGDT_SYS 1
277:
278: #define GDT_SYS_OFFSET (NGDT_MEM << 3)
279:
280: #define GDT_ADDR_MEM(s,i) \
281: ((struct mem_segment_descriptor *)((s) + ((i) << 3)))
282: #define GDT_ADDR_SYS(s,i) \
283: ((struct sys_segment_descriptor *)((s) + (((i) << 4) + SYSSEL_START)))
284:
285: /*
286: * Byte offsets in the Local Descriptor Table (LDT)
287: * Strange order because of syscall/sysret insns
288: */
289: #define LSYS5CALLS_SEL 0 /* iBCS system call gate */
290: #define LUCODE32_SEL 8 /* 32 bit user code descriptor */
291: #define LUDATA_SEL 16 /* User data descriptor */
292: #define LUCODE_SEL 24 /* User code descriptor */
293: #define LSOL26CALLS_SEL 32 /* Solaris 2.6 system call gate */
294: #define LUDATA32_SEL 56 /* 32 bit user data descriptor (needed?)*/
295: #define LBSDICALLS_SEL 128 /* BSDI system call gate */
296:
297: #define LDT_SIZE 144
298:
299: #define LSYSRETBASE_SEL LUCODE32_SEL
300:
301: /*
302: * Checks for valid user selectors. If USER_LDT ever gets implemented
303: * for amd64, these must check the ldt length and SEL_UPL if a user
304: * ldt is active.
305: */
306: #define VALID_USER_DSEL32(s) \
307: ((s) == GSEL(GUDATA32_SEL, SEL_UPL) || (s) == LSEL(LUDATA32_SEL, SEL_UPL))
308: #define VALID_USER_CSEL32(s) \
309: ((s) == GSEL(GUCODE32_SEL, SEL_UPL) || (s) == LSEL(LUCODE32_SEL, SEL_UPL))
310:
311: #define VALID_USER_CSEL(s) \
312: ((s) == GSEL(GUCODE_SEL, SEL_UPL) || (s) == LSEL(LUCODE_SEL, SEL_UPL))
313: #define VALID_USER_DSEL(s) \
314: ((s) == GSEL(GUDATA_SEL, SEL_UPL) || (s) == LSEL(LUDATA_SEL, SEL_UPL))
315:
316: #endif /* _AMD64_SEGMENTS_H_ */
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