2 * Copyright (c) 1989, 1990 William F. Jolitz
3 * Copyright (c) 1990 The Regents of the University of California.
6 * This code is derived from software contributed to Berkeley by
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10 * modification, are permitted provided that the following conditions
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17 * 4. Neither the name of the University nor the names of its contributors
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21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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33 * from: @(#)segments.h 7.1 (Berkeley) 5/9/91
37 #ifndef _MACHINE_SEGMENTS_H_
38 #define _MACHINE_SEGMENTS_H_
41 * AMD64 Segmentation Data Structures and definitions
44 #include <x86/segments.h>
47 * System segment descriptors (128 bit wide)
49 struct system_segment_descriptor {
50 u_int64_t sd_lolimit:16; /* segment extent (lsb) */
51 u_int64_t sd_lobase:24; /* segment base address (lsb) */
52 u_int64_t sd_type:5; /* segment type */
53 u_int64_t sd_dpl:2; /* segment descriptor priority level */
54 u_int64_t sd_p:1; /* segment descriptor present */
55 u_int64_t sd_hilimit:4; /* segment extent (msb) */
56 u_int64_t sd_xx0:3; /* unused */
57 u_int64_t sd_gran:1; /* limit granularity (byte/page units)*/
58 u_int64_t sd_hibase:40 __packed;/* segment base address (msb) */
60 u_int64_t sd_mbz:5; /* MUST be zero */
65 * Software definitions are in this convenient format,
66 * which are translated into inconvenient segment descriptors
67 * when needed to be used by the 386 hardware
70 struct soft_segment_descriptor {
71 unsigned long ssd_base; /* segment base address */
72 unsigned long ssd_limit; /* segment extent */
73 unsigned long ssd_type:5; /* segment type */
74 unsigned long ssd_dpl:2; /* segment descriptor priority level */
75 unsigned long ssd_p:1; /* segment descriptor present */
76 unsigned long ssd_long:1; /* long mode (for %cs) */
77 unsigned long ssd_def32:1; /* default 32 vs 16 bit size */
78 unsigned long ssd_gran:1; /* limit granularity (byte/page units)*/
82 * region descriptors, used to load gdt/idt tables before segments yet exist.
84 struct region_descriptor {
85 uint64_t rd_limit:16; /* segment extent */
86 uint64_t rd_base:64 __packed; /* base address */
90 extern struct user_segment_descriptor gdt[];
91 extern struct soft_segment_descriptor gdt_segs[];
92 extern struct gate_descriptor *idt;
93 extern struct region_descriptor r_gdt, r_idt;
95 void lgdt(struct region_descriptor *rdp);
96 void sdtossd(struct user_segment_descriptor *sdp,
97 struct soft_segment_descriptor *ssdp);
98 void ssdtosd(struct soft_segment_descriptor *ssdp,
99 struct user_segment_descriptor *sdp);
100 void ssdtosyssd(struct soft_segment_descriptor *ssdp,
101 struct system_segment_descriptor *sdp);
102 void update_gdt_gsbase(struct thread *td, uint32_t base);
103 void update_gdt_fsbase(struct thread *td, uint32_t base);
106 #endif /* !_MACHINE_SEGMENTS_H_ */