#ifndef _ASM_X86_SEGMENT_H_ #define _ASM_X86_SEGMENT_H_ /* 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) #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 __USER_CS (GDT_ENTRY_DEFAULT_USER_CS * 8 + 3) #define GDT_ENTRY_DEFAULT_USER_DS 15 #define __USER_DS (GDT_ENTRY_DEFAULT_USER_DS * 8 + 3) #define GDT_ENTRY_KERNEL_BASE 12 #define GDT_ENTRY_KERNEL_CS (GDT_ENTRY_KERNEL_BASE + 0) #define __KERNEL_CS (GDT_ENTRY_KERNEL_CS * 8) #define GDT_ENTRY_KERNEL_DS (GDT_ENTRY_KERNEL_BASE + 1) #define __KERNEL_DS (GDT_ENTRY_KERNEL_DS * 8) #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 #define __KERNEL_CS 0x10 #define __KERNEL_DS 0x18 #define __KERNEL32_CS 0x08 /* * 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 __USER32_CS 0x23 /* 4*8+3 */ #define __USER_DS 0x2b /* 5*8+3 */ #define __USER_CS 0x33 /* 6*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 #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 GDT_SIZE (GDT_ENTRIES * 8) #define GDT_ENTRY_TLS_ENTRIES 3 #define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8) #endif