2608a6584a
This copies into asm-x86/segment_64.h some macros from asm-x86/segment_32.h for dissecting segment selectors. This lets other code use these macros uniformly on 32/64-bit rather than duplicating the constants elsewhere. Signed-off-by: Roland McGrath <roland@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
#ifndef _ASM_SEGMENT_H
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#define _ASM_SEGMENT_H
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#include <asm/cache.h>
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/* Simple and small GDT entries for booting only */
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#define GDT_ENTRY_BOOT_CS 2
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#define __BOOT_CS (GDT_ENTRY_BOOT_CS * 8)
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#define GDT_ENTRY_BOOT_DS (GDT_ENTRY_BOOT_CS + 1)
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#define __BOOT_DS (GDT_ENTRY_BOOT_DS * 8)
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#define __KERNEL_CS 0x10
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#define __KERNEL_DS 0x18
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#define __KERNEL32_CS 0x08
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/*
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* we cannot use the same code segment descriptor for user and kernel
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* -- not even in the long flat mode, because of different DPL /kkeil
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* The segment offset needs to contain a RPL. Grr. -AK
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* GDT layout to get 64bit syscall right (sysret hardcodes gdt offsets)
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*/
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#define __USER32_CS 0x23 /* 4*8+3 */
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#define __USER_DS 0x2b /* 5*8+3 */
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#define __USER_CS 0x33 /* 6*8+3 */
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#define __USER32_DS __USER_DS
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#define GDT_ENTRY_TSS 8 /* needs two entries */
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#define GDT_ENTRY_LDT 10 /* needs two entries */
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#define GDT_ENTRY_TLS_MIN 12
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#define GDT_ENTRY_TLS_MAX 14
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#define GDT_ENTRY_TLS_ENTRIES 3
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#define GDT_ENTRY_PER_CPU 15 /* Abused to load per CPU data from limit */
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#define __PER_CPU_SEG (GDT_ENTRY_PER_CPU * 8 + 3)
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/* TLS indexes for 64bit - hardcoded in arch_prctl */
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#define FS_TLS 0
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#define GS_TLS 1
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#define GS_TLS_SEL ((GDT_ENTRY_TLS_MIN+GS_TLS)*8 + 3)
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#define FS_TLS_SEL ((GDT_ENTRY_TLS_MIN+FS_TLS)*8 + 3)
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#define IDT_ENTRIES 256
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#define GDT_ENTRIES 16
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#define GDT_SIZE (GDT_ENTRIES * 8)
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#define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8)
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/* Bottom two bits of selector give the ring privilege level */
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#define SEGMENT_RPL_MASK 0x3
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/* Bit 2 is table indicator (LDT/GDT) */
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#define SEGMENT_TI_MASK 0x4
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/* User mode is privilege level 3 */
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#define USER_RPL 0x3
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/* LDT segment has TI set, GDT has it cleared */
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#define SEGMENT_LDT 0x4
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#define SEGMENT_GDT 0x0
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#endif
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