source: trunk/packages/xen-3.1/xen-3.1/linux-2.6-xen-sparse/include/asm-i386/mach-xen/asm/segment.h @ 34

Last change on this file since 34 was 34, checked in by hartmans, 18 years ago

Add xen and xen-common

File size: 3.3 KB
Line 
1#ifndef _ASM_SEGMENT_H
2#define _ASM_SEGMENT_H
3
4/*
5 * The layout of the per-CPU GDT under Linux:
6 *
7 *   0 - null
8 *   1 - reserved
9 *   2 - reserved
10 *   3 - reserved
11 *
12 *   4 - unused                 <==== new cacheline
13 *   5 - unused
14 *
15 *  ------- start of TLS (Thread-Local Storage) segments:
16 *
17 *   6 - TLS segment #1                 [ glibc's TLS segment ]
18 *   7 - TLS segment #2                 [ Wine's %fs Win32 segment ]
19 *   8 - TLS segment #3
20 *   9 - reserved
21 *  10 - reserved
22 *  11 - reserved
23 *
24 *  ------- start of kernel segments:
25 *
26 *  12 - kernel code segment            <==== new cacheline
27 *  13 - kernel data segment
28 *  14 - default user CS
29 *  15 - default user DS
30 *  16 - TSS
31 *  17 - LDT
32 *  18 - PNPBIOS support (16->32 gate)
33 *  19 - PNPBIOS support
34 *  20 - PNPBIOS support
35 *  21 - PNPBIOS support
36 *  22 - PNPBIOS support
37 *  23 - APM BIOS support
38 *  24 - APM BIOS support
39 *  25 - APM BIOS support
40 *
41 *  26 - ESPFIX small SS
42 *  27 - unused
43 *  28 - unused
44 *  29 - unused
45 *  30 - unused
46 *  31 - TSS for double fault handler
47 */
48#define GDT_ENTRY_TLS_ENTRIES   3
49#define GDT_ENTRY_TLS_MIN       6
50#define GDT_ENTRY_TLS_MAX       (GDT_ENTRY_TLS_MIN + GDT_ENTRY_TLS_ENTRIES - 1)
51
52#define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8)
53
54#define GDT_ENTRY_DEFAULT_USER_CS       14
55#define __USER_CS (GDT_ENTRY_DEFAULT_USER_CS * 8 + 3)
56
57#define GDT_ENTRY_DEFAULT_USER_DS       15
58#define __USER_DS (GDT_ENTRY_DEFAULT_USER_DS * 8 + 3)
59
60#define GDT_ENTRY_KERNEL_BASE   12
61
62#define GDT_ENTRY_KERNEL_CS             (GDT_ENTRY_KERNEL_BASE + 0)
63#define __KERNEL_CS (GDT_ENTRY_KERNEL_CS * 8)
64#define GET_KERNEL_CS() (__KERNEL_CS | (xen_feature(XENFEAT_supervisor_mode_kernel)?0:1) )
65
66#define GDT_ENTRY_KERNEL_DS             (GDT_ENTRY_KERNEL_BASE + 1)
67#define __KERNEL_DS (GDT_ENTRY_KERNEL_DS * 8)
68#define GET_KERNEL_DS() (__KERNEL_DS | (xen_feature(XENFEAT_supervisor_mode_kernel)?0:1) )
69
70#define GDT_ENTRY_TSS                   (GDT_ENTRY_KERNEL_BASE + 4)
71#define GDT_ENTRY_LDT                   (GDT_ENTRY_KERNEL_BASE + 5)
72
73#define GDT_ENTRY_PNPBIOS_BASE          (GDT_ENTRY_KERNEL_BASE + 6)
74#define GDT_ENTRY_APMBIOS_BASE          (GDT_ENTRY_KERNEL_BASE + 11)
75
76#define GDT_ENTRY_ESPFIX_SS             (GDT_ENTRY_KERNEL_BASE + 14)
77#define __ESPFIX_SS (GDT_ENTRY_ESPFIX_SS * 8)
78
79#define GDT_ENTRY_DOUBLEFAULT_TSS       31
80
81/*
82 * The GDT has 32 entries
83 */
84#define GDT_ENTRIES 32
85
86#define GDT_SIZE (GDT_ENTRIES * 8)
87
88/* Simple and small GDT entries for booting only */
89
90#define GDT_ENTRY_BOOT_CS               2
91#define __BOOT_CS       (GDT_ENTRY_BOOT_CS * 8)
92
93#define GDT_ENTRY_BOOT_DS               (GDT_ENTRY_BOOT_CS + 1)
94#define __BOOT_DS       (GDT_ENTRY_BOOT_DS * 8)
95
96/* The PnP BIOS entries in the GDT */
97#define GDT_ENTRY_PNPBIOS_CS32          (GDT_ENTRY_PNPBIOS_BASE + 0)
98#define GDT_ENTRY_PNPBIOS_CS16          (GDT_ENTRY_PNPBIOS_BASE + 1)
99#define GDT_ENTRY_PNPBIOS_DS            (GDT_ENTRY_PNPBIOS_BASE + 2)
100#define GDT_ENTRY_PNPBIOS_TS1           (GDT_ENTRY_PNPBIOS_BASE + 3)
101#define GDT_ENTRY_PNPBIOS_TS2           (GDT_ENTRY_PNPBIOS_BASE + 4)
102
103/* The PnP BIOS selectors */
104#define PNP_CS32   (GDT_ENTRY_PNPBIOS_CS32 * 8) /* segment for calling fn */
105#define PNP_CS16   (GDT_ENTRY_PNPBIOS_CS16 * 8) /* code segment for BIOS */
106#define PNP_DS     (GDT_ENTRY_PNPBIOS_DS * 8)   /* data segment for BIOS */
107#define PNP_TS1    (GDT_ENTRY_PNPBIOS_TS1 * 8)  /* transfer data segment */
108#define PNP_TS2    (GDT_ENTRY_PNPBIOS_TS2 * 8)  /* another data segment */
109
110/*
111 * The interrupt descriptor table has room for 256 idt's,
112 * the global descriptor table is dependent on the number
113 * of tasks we can have..
114 */
115#define IDT_ENTRIES 256
116
117#endif
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