| 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115 |
- #ifndef _ASM_SEGMENT_H
- #define _ASM_SEGMENT_H
- /*
- * 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 - unused
- * 28 - unused
- * 29 - unused
- * 30 - unused
- * 31 - TSS for double fault handler
- */
- #define GDT_ENTRY_TLS_ENTRIES 3
- #define GDT_ENTRY_TLS_MIN 6
- #define GDT_ENTRY_TLS_MAX (GDT_ENTRY_TLS_MIN + GDT_ENTRY_TLS_ENTRIES - 1)
- #define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8)
- #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_DOUBLEFAULT_TSS 31
- /*
- * The GDT has 32 entries
- */
- #define GDT_ENTRIES 32
- #define GDT_SIZE (GDT_ENTRIES * 8)
- /* 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)
- /* 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 */
- /*
- * The interrupt descriptor table has room for 256 idt's,
- * the global descriptor table is dependent on the number
- * of tasks we can have..
- */
- #define IDT_ENTRIES 256
- #endif
|
