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Glauber de Oliveira Costacef18952008-01-30 13:31:09 +01001#ifndef _ASM_X86_SEGMENT_H_
2#define _ASM_X86_SEGMENT_H_
3
H. Peter Anvin2a6648e2008-01-30 13:33:01 +01004/* Simple and small GDT entries for booting only */
5
6#define GDT_ENTRY_BOOT_CS 2
7#define __BOOT_CS (GDT_ENTRY_BOOT_CS * 8)
8
9#define GDT_ENTRY_BOOT_DS (GDT_ENTRY_BOOT_CS + 1)
10#define __BOOT_DS (GDT_ENTRY_BOOT_DS * 8)
11
H. Peter Anvin88089512008-01-30 13:33:02 +010012#define GDT_ENTRY_BOOT_TSS (GDT_ENTRY_BOOT_CS + 2)
13#define __BOOT_TSS (GDT_ENTRY_BOOT_TSS * 8)
14
Thomas Gleixner96a388d2007-10-11 11:20:03 +020015#ifdef CONFIG_X86_32
Glauber de Oliveira Costab23be392008-01-30 13:31:09 +010016/*
17 * The layout of the per-CPU GDT under Linux:
18 *
19 * 0 - null
20 * 1 - reserved
21 * 2 - reserved
22 * 3 - reserved
23 *
24 * 4 - unused <==== new cacheline
25 * 5 - unused
26 *
27 * ------- start of TLS (Thread-Local Storage) segments:
28 *
29 * 6 - TLS segment #1 [ glibc's TLS segment ]
30 * 7 - TLS segment #2 [ Wine's %fs Win32 segment ]
31 * 8 - TLS segment #3
32 * 9 - reserved
33 * 10 - reserved
34 * 11 - reserved
35 *
36 * ------- start of kernel segments:
37 *
38 * 12 - kernel code segment <==== new cacheline
39 * 13 - kernel data segment
40 * 14 - default user CS
41 * 15 - default user DS
42 * 16 - TSS
43 * 17 - LDT
44 * 18 - PNPBIOS support (16->32 gate)
45 * 19 - PNPBIOS support
46 * 20 - PNPBIOS support
47 * 21 - PNPBIOS support
48 * 22 - PNPBIOS support
49 * 23 - APM BIOS support
50 * 24 - APM BIOS support
51 * 25 - APM BIOS support
52 *
53 * 26 - ESPFIX small SS
54 * 27 - per-cpu [ offset to per-cpu data area ]
55 * 28 - unused
56 * 29 - unused
57 * 30 - unused
58 * 31 - TSS for double fault handler
59 */
60#define GDT_ENTRY_TLS_MIN 6
61#define GDT_ENTRY_TLS_MAX (GDT_ENTRY_TLS_MIN + GDT_ENTRY_TLS_ENTRIES - 1)
62
63#define GDT_ENTRY_DEFAULT_USER_CS 14
64#define __USER_CS (GDT_ENTRY_DEFAULT_USER_CS * 8 + 3)
65
66#define GDT_ENTRY_DEFAULT_USER_DS 15
67#define __USER_DS (GDT_ENTRY_DEFAULT_USER_DS * 8 + 3)
68
69#define GDT_ENTRY_KERNEL_BASE 12
70
71#define GDT_ENTRY_KERNEL_CS (GDT_ENTRY_KERNEL_BASE + 0)
72#define __KERNEL_CS (GDT_ENTRY_KERNEL_CS * 8)
73
74#define GDT_ENTRY_KERNEL_DS (GDT_ENTRY_KERNEL_BASE + 1)
75#define __KERNEL_DS (GDT_ENTRY_KERNEL_DS * 8)
76
77#define GDT_ENTRY_TSS (GDT_ENTRY_KERNEL_BASE + 4)
78#define GDT_ENTRY_LDT (GDT_ENTRY_KERNEL_BASE + 5)
79
80#define GDT_ENTRY_PNPBIOS_BASE (GDT_ENTRY_KERNEL_BASE + 6)
81#define GDT_ENTRY_APMBIOS_BASE (GDT_ENTRY_KERNEL_BASE + 11)
82
83#define GDT_ENTRY_ESPFIX_SS (GDT_ENTRY_KERNEL_BASE + 14)
84#define __ESPFIX_SS (GDT_ENTRY_ESPFIX_SS * 8)
85
86#define GDT_ENTRY_PERCPU (GDT_ENTRY_KERNEL_BASE + 15)
87#ifdef CONFIG_SMP
88#define __KERNEL_PERCPU (GDT_ENTRY_PERCPU * 8)
Thomas Gleixner96a388d2007-10-11 11:20:03 +020089#else
Glauber de Oliveira Costab23be392008-01-30 13:31:09 +010090#define __KERNEL_PERCPU 0
91#endif
92
93#define GDT_ENTRY_DOUBLEFAULT_TSS 31
94
95/*
96 * The GDT has 32 entries
97 */
98#define GDT_ENTRIES 32
99
Glauber de Oliveira Costab23be392008-01-30 13:31:09 +0100100/* The PnP BIOS entries in the GDT */
101#define GDT_ENTRY_PNPBIOS_CS32 (GDT_ENTRY_PNPBIOS_BASE + 0)
102#define GDT_ENTRY_PNPBIOS_CS16 (GDT_ENTRY_PNPBIOS_BASE + 1)
103#define GDT_ENTRY_PNPBIOS_DS (GDT_ENTRY_PNPBIOS_BASE + 2)
104#define GDT_ENTRY_PNPBIOS_TS1 (GDT_ENTRY_PNPBIOS_BASE + 3)
105#define GDT_ENTRY_PNPBIOS_TS2 (GDT_ENTRY_PNPBIOS_BASE + 4)
106
107/* The PnP BIOS selectors */
108#define PNP_CS32 (GDT_ENTRY_PNPBIOS_CS32 * 8) /* segment for calling fn */
109#define PNP_CS16 (GDT_ENTRY_PNPBIOS_CS16 * 8) /* code segment for BIOS */
110#define PNP_DS (GDT_ENTRY_PNPBIOS_DS * 8) /* data segment for BIOS */
111#define PNP_TS1 (GDT_ENTRY_PNPBIOS_TS1 * 8) /* transfer data segment */
112#define PNP_TS2 (GDT_ENTRY_PNPBIOS_TS2 * 8) /* another data segment */
113
114/* Bottom two bits of selector give the ring privilege level */
115#define SEGMENT_RPL_MASK 0x3
116/* Bit 2 is table indicator (LDT/GDT) */
117#define SEGMENT_TI_MASK 0x4
118
119/* User mode is privilege level 3 */
120#define USER_RPL 0x3
121/* LDT segment has TI set, GDT has it cleared */
122#define SEGMENT_LDT 0x4
123#define SEGMENT_GDT 0x0
124
125/*
126 * Matching rules for certain types of segments.
127 */
128
129/* Matches only __KERNEL_CS, ignoring PnP / USER / APM segments */
130#define SEGMENT_IS_KERNEL_CODE(x) (((x) & 0xfc) == GDT_ENTRY_KERNEL_CS * 8)
131
132/* Matches __KERNEL_CS and __USER_CS (they must be 2 entries apart) */
133#define SEGMENT_IS_FLAT_CODE(x) (((x) & 0xec) == GDT_ENTRY_KERNEL_CS * 8)
134
135/* Matches PNP_CS32 and PNP_CS16 (they must be consecutive) */
136#define SEGMENT_IS_PNP_CODE(x) (((x) & 0xf4) == GDT_ENTRY_PNPBIOS_BASE * 8)
137
138
139#else
140#include <asm/cache.h>
141
Glauber de Oliveira Costab23be392008-01-30 13:31:09 +0100142#define __KERNEL_CS 0x10
143#define __KERNEL_DS 0x18
144
145#define __KERNEL32_CS 0x08
146
147/*
148 * we cannot use the same code segment descriptor for user and kernel
149 * -- not even in the long flat mode, because of different DPL /kkeil
150 * The segment offset needs to contain a RPL. Grr. -AK
151 * GDT layout to get 64bit syscall right (sysret hardcodes gdt offsets)
152 */
153
154#define __USER32_CS 0x23 /* 4*8+3 */
155#define __USER_DS 0x2b /* 5*8+3 */
156#define __USER_CS 0x33 /* 6*8+3 */
157#define __USER32_DS __USER_DS
158
159#define GDT_ENTRY_TSS 8 /* needs two entries */
160#define GDT_ENTRY_LDT 10 /* needs two entries */
161#define GDT_ENTRY_TLS_MIN 12
162#define GDT_ENTRY_TLS_MAX 14
163
164#define GDT_ENTRY_PER_CPU 15 /* Abused to load per CPU data from limit */
165#define __PER_CPU_SEG (GDT_ENTRY_PER_CPU * 8 + 3)
166
167/* TLS indexes for 64bit - hardcoded in arch_prctl */
168#define FS_TLS 0
169#define GS_TLS 1
170
171#define GS_TLS_SEL ((GDT_ENTRY_TLS_MIN+GS_TLS)*8 + 3)
172#define FS_TLS_SEL ((GDT_ENTRY_TLS_MIN+FS_TLS)*8 + 3)
173
174#define GDT_ENTRIES 16
175
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200176#endif
Glauber de Oliveira Costacef18952008-01-30 13:31:09 +0100177
178#ifndef CONFIG_PARAVIRT
179#define get_kernel_rpl() 0
180#endif
181
Glauber de Oliveira Costa15ee09b2008-01-30 13:31:09 +0100182/* User mode is privilege level 3 */
183#define USER_RPL 0x3
184/* LDT segment has TI set, GDT has it cleared */
185#define SEGMENT_LDT 0x4
186#define SEGMENT_GDT 0x0
187
188/* Bottom two bits of selector give the ring privilege level */
189#define SEGMENT_RPL_MASK 0x3
190/* Bit 2 is table indicator (LDT/GDT) */
191#define SEGMENT_TI_MASK 0x4
192
193#define IDT_ENTRIES 256
Andi Kleen5524ea32008-03-11 02:23:20 +0100194#define NUM_EXCEPTION_VECTORS 32
Glauber de Oliveira Costa15ee09b2008-01-30 13:31:09 +0100195#define GDT_SIZE (GDT_ENTRIES * 8)
196#define GDT_ENTRY_TLS_ENTRIES 3
197#define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8)
198
Roland McGrath8866cd92008-01-30 13:33:06 +0100199#ifdef __KERNEL__
200#ifndef __ASSEMBLY__
Andi Kleen5524ea32008-03-11 02:23:20 +0100201extern const char early_idt_handlers[NUM_EXCEPTION_VECTORS][10];
Roland McGrath8866cd92008-01-30 13:33:06 +0100202#endif
203#endif
204
Glauber de Oliveira Costacef18952008-01-30 13:31:09 +0100205#endif