#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 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 */