[linux-2.6-block.git] / include / asm-x86 / segment.h

#ifndef ASM_X86__SEGMENT_H
#define ASM_X86__SEGMENT_H

/* Constructor for a conventional segment GDT (or LDT) entry */
/* This is a macro so it can be used in initializers */
#define GDT_ENTRY(flags, base, limit)			\
	((((base)  & 0xff000000ULL) << (56-24)) |	\
	 (((flags) & 0x0000f0ffULL) << 40) |		\
	 (((limit) & 0x000f0000ULL) << (48-16)) |	\
	 (((base)  & 0x00ffffffULL) << 16) |		\
	 (((limit) & 0x0000ffffULL)))

/* Simple and small GDT entries for booting only */

#define GDT_ENTRY_BOOT_CS	2
#define __BOOT_CS		(GDT_ENTRY_BOOT_CS * 8)

#define GDT_ENTRY_BOOT_DS	(GDT_ENTRY_BOOT_CS + 1)
#define __BOOT_DS		(GDT_ENTRY_BOOT_DS * 8)

#define GDT_ENTRY_BOOT_TSS	(GDT_ENTRY_BOOT_CS + 2)
#define __BOOT_TSS		(GDT_ENTRY_BOOT_TSS * 8)

#ifdef CONFIG_X86_32
/*
 * The layout of the per-CPU GDT under Linux:
 *
 *   0 - null
 *   1 - reserved
 *   2 - reserved
 *   3 - reserved
 *
 *   4 - unused			<==== new cacheline
 *   5 - unused
 *
 *  ------- start of TLS (Thread-Local Storage) segments:
 *
 *   6 - TLS segment #1			[ glibc's TLS segment ]
 *   7 - TLS segment #2			[ Wine's %fs Win32 segment ]
 *   8 - TLS segment #3
 *   9 - reserved
 *  10 - reserved
 *  11 - reserved
 *
 *  ------- start of kernel segments:
 *
 *  12 - kernel code segment		<==== new cacheline
 *  13 - kernel data segment
 *  14 - default user CS
 *  15 - default user DS
 *  16 - TSS
 *  17 - LDT
 *  18 - PNPBIOS support (16->32 gate)
 *  19 - PNPBIOS support
 *  20 - PNPBIOS support
 *  21 - PNPBIOS support
 *  22 - PNPBIOS support
 *  23 - APM BIOS support
 *  24 - APM BIOS support
 *  25 - APM BIOS support
 *
 *  26 - ESPFIX small SS
 *  27 - per-cpu			[ offset to per-cpu data area ]
 *  28 - unused
 *  29 - unused
 *  30 - unused
 *  31 - TSS for double fault handler
 */
#define GDT_ENTRY_TLS_MIN	6
#define GDT_ENTRY_TLS_MAX 	(GDT_ENTRY_TLS_MIN + GDT_ENTRY_TLS_ENTRIES - 1)

#define GDT_ENTRY_DEFAULT_USER_CS	14

#define GDT_ENTRY_DEFAULT_USER_DS	15

#define GDT_ENTRY_KERNEL_BASE	12

#define GDT_ENTRY_KERNEL_CS		(GDT_ENTRY_KERNEL_BASE + 0)

#define GDT_ENTRY_KERNEL_DS		(GDT_ENTRY_KERNEL_BASE + 1)

#define GDT_ENTRY_TSS			(GDT_ENTRY_KERNEL_BASE + 4)
#define GDT_ENTRY_LDT			(GDT_ENTRY_KERNEL_BASE + 5)

#define GDT_ENTRY_PNPBIOS_BASE		(GDT_ENTRY_KERNEL_BASE + 6)
#define GDT_ENTRY_APMBIOS_BASE		(GDT_ENTRY_KERNEL_BASE + 11)

#define GDT_ENTRY_ESPFIX_SS		(GDT_ENTRY_KERNEL_BASE + 14)
#define __ESPFIX_SS (GDT_ENTRY_ESPFIX_SS * 8)

#define GDT_ENTRY_PERCPU			(GDT_ENTRY_KERNEL_BASE + 15)
#ifdef CONFIG_SMP
#define __KERNEL_PERCPU (GDT_ENTRY_PERCPU * 8)
#else
#define __KERNEL_PERCPU 0
#endif

#define GDT_ENTRY_DOUBLEFAULT_TSS	31

/*
 * The GDT has 32 entries
 */
#define GDT_ENTRIES 32

/* The PnP BIOS entries in the GDT */
#define GDT_ENTRY_PNPBIOS_CS32		(GDT_ENTRY_PNPBIOS_BASE + 0)
#define GDT_ENTRY_PNPBIOS_CS16		(GDT_ENTRY_PNPBIOS_BASE + 1)
#define GDT_ENTRY_PNPBIOS_DS		(GDT_ENTRY_PNPBIOS_BASE + 2)
#define GDT_ENTRY_PNPBIOS_TS1		(GDT_ENTRY_PNPBIOS_BASE + 3)
#define GDT_ENTRY_PNPBIOS_TS2		(GDT_ENTRY_PNPBIOS_BASE + 4)

/* The PnP BIOS selectors */
#define PNP_CS32   (GDT_ENTRY_PNPBIOS_CS32 * 8)	/* segment for calling fn */
#define PNP_CS16   (GDT_ENTRY_PNPBIOS_CS16 * 8)	/* code segment for BIOS */
#define PNP_DS     (GDT_ENTRY_PNPBIOS_DS * 8)	/* data segment for BIOS */
#define PNP_TS1    (GDT_ENTRY_PNPBIOS_TS1 * 8)	/* transfer data segment */
#define PNP_TS2    (GDT_ENTRY_PNPBIOS_TS2 * 8)	/* another data segment */

/* Bottom two bits of selector give the ring privilege level */
#define SEGMENT_RPL_MASK	0x3
/* Bit 2 is table indicator (LDT/GDT) */
#define SEGMENT_TI_MASK		0x4

/* User mode is privilege level 3 */
#define USER_RPL		0x3
/* LDT segment has TI set, GDT has it cleared */
#define SEGMENT_LDT		0x4
#define SEGMENT_GDT		0x0

/*
 * Matching rules for certain types of segments.
 */

/* Matches only __KERNEL_CS, ignoring PnP / USER / APM segments */
#define SEGMENT_IS_KERNEL_CODE(x) (((x) & 0xfc) == GDT_ENTRY_KERNEL_CS * 8)

/* Matches __KERNEL_CS and __USER_CS (they must be 2 entries apart) */
#define SEGMENT_IS_FLAT_CODE(x)  (((x) & 0xec) == GDT_ENTRY_KERNEL_CS * 8)

/* Matches PNP_CS32 and PNP_CS16 (they must be consecutive) */
#define SEGMENT_IS_PNP_CODE(x)   (((x) & 0xf4) == GDT_ENTRY_PNPBIOS_BASE * 8)


#else
#include <asm/cache.h>

#define GDT_ENTRY_KERNEL32_CS 1
#define GDT_ENTRY_KERNEL_CS 2
#define GDT_ENTRY_KERNEL_DS 3

#define __KERNEL32_CS   (GDT_ENTRY_KERNEL32_CS * 8)

/*
 * we cannot use the same code segment descriptor for user and kernel
 * -- not even in the long flat mode, because of different DPL /kkeil
 * The segment offset needs to contain a RPL. Grr. -AK
 * GDT layout to get 64bit syscall right (sysret hardcodes gdt offsets)
 */
#define GDT_ENTRY_DEFAULT_USER32_CS 4
#define GDT_ENTRY_DEFAULT_USER_DS 5
#define GDT_ENTRY_DEFAULT_USER_CS 6
#define __USER32_CS   (GDT_ENTRY_DEFAULT_USER32_CS * 8 + 3)
#define __USER32_DS	__USER_DS

#define GDT_ENTRY_TSS 8	/* needs two entries */
#define GDT_ENTRY_LDT 10 /* needs two entries */
#define GDT_ENTRY_TLS_MIN 12
#define GDT_ENTRY_TLS_MAX 14

#define GDT_ENTRY_PER_CPU 15	/* Abused to load per CPU data from limit */
#define __PER_CPU_SEG	(GDT_ENTRY_PER_CPU * 8 + 3)

/* TLS indexes for 64bit - hardcoded in arch_prctl */
#define FS_TLS 0
#define GS_TLS 1

#define GS_TLS_SEL ((GDT_ENTRY_TLS_MIN+GS_TLS)*8 + 3)
#define FS_TLS_SEL ((GDT_ENTRY_TLS_MIN+FS_TLS)*8 + 3)

#define GDT_ENTRIES 16

#endif

#define __KERNEL_CS	(GDT_ENTRY_KERNEL_CS * 8)
#define __KERNEL_DS	(GDT_ENTRY_KERNEL_DS * 8)
#define __USER_DS     (GDT_ENTRY_DEFAULT_USER_DS* 8 + 3)
#define __USER_CS     (GDT_ENTRY_DEFAULT_USER_CS* 8 + 3)
#ifndef CONFIG_PARAVIRT
#define get_kernel_rpl()  0
#endif

/* User mode is privilege level 3 */
#define USER_RPL		0x3
/* LDT segment has TI set, GDT has it cleared */
#define SEGMENT_LDT		0x4
#define SEGMENT_GDT		0x0

/* Bottom two bits of selector give the ring privilege level */
#define SEGMENT_RPL_MASK	0x3
/* Bit 2 is table indicator (LDT/GDT) */
#define SEGMENT_TI_MASK		0x4

#define IDT_ENTRIES 256
#define NUM_EXCEPTION_VECTORS 32
#define GDT_SIZE (GDT_ENTRIES * 8)
#define GDT_ENTRY_TLS_ENTRIES 3
#define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8)

#ifdef __KERNEL__
#ifndef __ASSEMBLY__
extern const char early_idt_handlers[NUM_EXCEPTION_VECTORS][10];
#endif
#endif

#endif /* ASM_X86__SEGMENT_H */
Commit	Line	Data
77ef50a5 VN	1	#ifndef ASM_X86__SEGMENT_H
77ef50a5 VN	2	#define ASM_X86__SEGMENT_H
cef18950	3
4fdf08b5 PA	4	/* Constructor for a conventional segment GDT (or LDT) entry */
	5	/* This is a macro so it can be used in initializers */
	6	#define GDT_ENTRY(flags, base, limit) \
	7	((((base) & 0xff000000ULL) << (56-24)) \| \
	8	(((flags) & 0x0000f0ffULL) << 40) \| \
	9	(((limit) & 0x000f0000ULL) << (48-16)) \| \
	10	(((base) & 0x00ffffffULL) << 16) \| \
	11	(((limit) & 0x0000ffffULL)))
	12
2a6648e6 PA	13	/* Simple and small GDT entries for booting only */
	14
	15	#define GDT_ENTRY_BOOT_CS 2
	16	#define __BOOT_CS (GDT_ENTRY_BOOT_CS * 8)
	17
	18	#define GDT_ENTRY_BOOT_DS (GDT_ENTRY_BOOT_CS + 1)
	19	#define __BOOT_DS (GDT_ENTRY_BOOT_DS * 8)
	20
88089519 PA	21	#define GDT_ENTRY_BOOT_TSS (GDT_ENTRY_BOOT_CS + 2)
	22	#define __BOOT_TSS (GDT_ENTRY_BOOT_TSS * 8)
	23
96a388de	24	#ifdef CONFIG_X86_32
b23be399 GOC	25	/*
	26	* The layout of the per-CPU GDT under Linux:
	27	*
	28	* 0 - null
	29	* 1 - reserved
	30	* 2 - reserved
	31	* 3 - reserved
	32	*
	33	* 4 - unused <==== new cacheline
	34	* 5 - unused
	35	*
	36	* ------- start of TLS (Thread-Local Storage) segments:
	37	*
	38	* 6 - TLS segment #1 [ glibc's TLS segment ]
	39	* 7 - TLS segment #2 [ Wine's %fs Win32 segment ]
	40	* 8 - TLS segment #3
	41	* 9 - reserved
	42	* 10 - reserved
	43	* 11 - reserved
	44	*
	45	* ------- start of kernel segments:
	46	*
	47	* 12 - kernel code segment <==== new cacheline
	48	* 13 - kernel data segment
	49	* 14 - default user CS
	50	* 15 - default user DS
	51	* 16 - TSS
	52	* 17 - LDT
	53	* 18 - PNPBIOS support (16->32 gate)
	54	* 19 - PNPBIOS support
	55	* 20 - PNPBIOS support
	56	* 21 - PNPBIOS support
	57	* 22 - PNPBIOS support
	58	* 23 - APM BIOS support
	59	* 24 - APM BIOS support
	60	* 25 - APM BIOS support
	61	*
	62	* 26 - ESPFIX small SS
	63	* 27 - per-cpu [ offset to per-cpu data area ]
	64	* 28 - unused
	65	* 29 - unused
	66	* 30 - unused
	67	* 31 - TSS for double fault handler
	68	*/
	69	#define GDT_ENTRY_TLS_MIN 6
	70	#define GDT_ENTRY_TLS_MAX (GDT_ENTRY_TLS_MIN + GDT_ENTRY_TLS_ENTRIES - 1)
	71
	72	#define GDT_ENTRY_DEFAULT_USER_CS 14
b23be399 GOC	73
b23be399 GOC	74	#define GDT_ENTRY_DEFAULT_USER_DS 15
b23be399 GOC	75
	76	#define GDT_ENTRY_KERNEL_BASE 12
	77
	78	#define GDT_ENTRY_KERNEL_CS (GDT_ENTRY_KERNEL_BASE + 0)
b23be399 GOC	79
b23be399 GOC	80	#define GDT_ENTRY_KERNEL_DS (GDT_ENTRY_KERNEL_BASE + 1)
b23be399 GOC	81
	82	#define GDT_ENTRY_TSS (GDT_ENTRY_KERNEL_BASE + 4)
	83	#define GDT_ENTRY_LDT (GDT_ENTRY_KERNEL_BASE + 5)
	84
	85	#define GDT_ENTRY_PNPBIOS_BASE (GDT_ENTRY_KERNEL_BASE + 6)
	86	#define GDT_ENTRY_APMBIOS_BASE (GDT_ENTRY_KERNEL_BASE + 11)
	87
	88	#define GDT_ENTRY_ESPFIX_SS (GDT_ENTRY_KERNEL_BASE + 14)
	89	#define __ESPFIX_SS (GDT_ENTRY_ESPFIX_SS * 8)
	90
	91	#define GDT_ENTRY_PERCPU (GDT_ENTRY_KERNEL_BASE + 15)
	92	#ifdef CONFIG_SMP
	93	#define __KERNEL_PERCPU (GDT_ENTRY_PERCPU * 8)
	94	#else
	95	#define __KERNEL_PERCPU 0
	96	#endif
	97
	98	#define GDT_ENTRY_DOUBLEFAULT_TSS 31
	99
	100	/*
	101	* The GDT has 32 entries
	102	*/
	103	#define GDT_ENTRIES 32
	104
b23be399 GOC	105	/* The PnP BIOS entries in the GDT */
	106	#define GDT_ENTRY_PNPBIOS_CS32 (GDT_ENTRY_PNPBIOS_BASE + 0)
	107	#define GDT_ENTRY_PNPBIOS_CS16 (GDT_ENTRY_PNPBIOS_BASE + 1)
	108	#define GDT_ENTRY_PNPBIOS_DS (GDT_ENTRY_PNPBIOS_BASE + 2)
	109	#define GDT_ENTRY_PNPBIOS_TS1 (GDT_ENTRY_PNPBIOS_BASE + 3)
	110	#define GDT_ENTRY_PNPBIOS_TS2 (GDT_ENTRY_PNPBIOS_BASE + 4)
	111
	112	/* The PnP BIOS selectors */
	113	#define PNP_CS32 (GDT_ENTRY_PNPBIOS_CS32 * 8) /* segment for calling fn */
	114	#define PNP_CS16 (GDT_ENTRY_PNPBIOS_CS16 * 8) /* code segment for BIOS */
	115	#define PNP_DS (GDT_ENTRY_PNPBIOS_DS * 8) /* data segment for BIOS */
	116	#define PNP_TS1 (GDT_ENTRY_PNPBIOS_TS1 * 8) /* transfer data segment */
	117	#define PNP_TS2 (GDT_ENTRY_PNPBIOS_TS2 * 8) /* another data segment */
	118
	119	/* Bottom two bits of selector give the ring privilege level */
	120	#define SEGMENT_RPL_MASK 0x3
	121	/* Bit 2 is table indicator (LDT/GDT) */
	122	#define SEGMENT_TI_MASK 0x4
	123
	124	/* User mode is privilege level 3 */
	125	#define USER_RPL 0x3
	126	/* LDT segment has TI set, GDT has it cleared */
	127	#define SEGMENT_LDT 0x4
	128	#define SEGMENT_GDT 0x0
	129
	130	/*
	131	* Matching rules for certain types of segments.
	132	*/
	133
	134	/* Matches only __KERNEL_CS, ignoring PnP / USER / APM segments */
	135	#define SEGMENT_IS_KERNEL_CODE(x) (((x) & 0xfc) == GDT_ENTRY_KERNEL_CS * 8)
	136
	137	/* Matches __KERNEL_CS and __USER_CS (they must be 2 entries apart) */
	138	#define SEGMENT_IS_FLAT_CODE(x) (((x) & 0xec) == GDT_ENTRY_KERNEL_CS * 8)
	139
	140	/* Matches PNP_CS32 and PNP_CS16 (they must be consecutive) */
	141	#define SEGMENT_IS_PNP_CODE(x) (((x) & 0xf4) == GDT_ENTRY_PNPBIOS_BASE * 8)
	142
	143
96a388de	144	#else
b23be399 GOC	145	#include <asm/cache.h>
b23be399 GOC	146
a939098a GC	147	#define GDT_ENTRY_KERNEL32_CS 1
	148	#define GDT_ENTRY_KERNEL_CS 2
	149	#define GDT_ENTRY_KERNEL_DS 3
b23be399	150
a939098a	151	#define __KERNEL32_CS (GDT_ENTRY_KERNEL32_CS * 8)
b23be399 GOC	152
	153	/*
	154	* we cannot use the same code segment descriptor for user and kernel
	155	* -- not even in the long flat mode, because of different DPL /kkeil
	156	* The segment offset needs to contain a RPL. Grr. -AK
	157	* GDT layout to get 64bit syscall right (sysret hardcodes gdt offsets)
	158	*/
a939098a GC	159	#define GDT_ENTRY_DEFAULT_USER32_CS 4
	160	#define GDT_ENTRY_DEFAULT_USER_DS 5
	161	#define GDT_ENTRY_DEFAULT_USER_CS 6
	162	#define __USER32_CS (GDT_ENTRY_DEFAULT_USER32_CS * 8 + 3)
b23be399 GOC	163	#define __USER32_DS __USER_DS
	164
	165	#define GDT_ENTRY_TSS 8 /* needs two entries */
	166	#define GDT_ENTRY_LDT 10 /* needs two entries */
	167	#define GDT_ENTRY_TLS_MIN 12
	168	#define GDT_ENTRY_TLS_MAX 14
	169
	170	#define GDT_ENTRY_PER_CPU 15 /* Abused to load per CPU data from limit */
	171	#define __PER_CPU_SEG (GDT_ENTRY_PER_CPU * 8 + 3)
	172
	173	/* TLS indexes for 64bit - hardcoded in arch_prctl */
	174	#define FS_TLS 0
	175	#define GS_TLS 1
	176
	177	#define GS_TLS_SEL ((GDT_ENTRY_TLS_MIN+GS_TLS)*8 + 3)
	178	#define FS_TLS_SEL ((GDT_ENTRY_TLS_MIN+FS_TLS)*8 + 3)
	179
	180	#define GDT_ENTRIES 16
	181
96a388de	182	#endif
cef18950	183
a939098a GC	184	#define __KERNEL_CS (GDT_ENTRY_KERNEL_CS * 8)
	185	#define __KERNEL_DS (GDT_ENTRY_KERNEL_DS * 8)
	186	#define __USER_DS (GDT_ENTRY_DEFAULT_USER_DS* 8 + 3)
	187	#define __USER_CS (GDT_ENTRY_DEFAULT_USER_CS* 8 + 3)
cef18950 GOC	188	#ifndef CONFIG_PARAVIRT
	189	#define get_kernel_rpl() 0
	190	#endif
	191
15ee09b4 GOC	192	/* User mode is privilege level 3 */
	193	#define USER_RPL 0x3
	194	/* LDT segment has TI set, GDT has it cleared */
	195	#define SEGMENT_LDT 0x4
	196	#define SEGMENT_GDT 0x0
	197
	198	/* Bottom two bits of selector give the ring privilege level */
	199	#define SEGMENT_RPL_MASK 0x3
	200	/* Bit 2 is table indicator (LDT/GDT) */
	201	#define SEGMENT_TI_MASK 0x4
	202
	203	#define IDT_ENTRIES 256
5524ea32	204	#define NUM_EXCEPTION_VECTORS 32
15ee09b4 GOC	205	#define GDT_SIZE (GDT_ENTRIES * 8)
	206	#define GDT_ENTRY_TLS_ENTRIES 3
	207	#define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8)
	208
8866cd9d RM	209	#ifdef __KERNEL__
8866cd9d RM	210	#ifndef __ASSEMBLY__
5524ea32	211	extern const char early_idt_handlers[NUM_EXCEPTION_VECTORS][10];
8866cd9d RM	212	#endif
	213	#endif
	214
77ef50a5	215	#endif /* ASM_X86__SEGMENT_H */