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/* SPDX-License-Identifier: GPL-2.0 */ /* Written 2000 by Andi Kleen */ #ifndef _ASM_X86_DESC_DEFS_H #define _ASM_X86_DESC_DEFS_H /* * Segment descriptor structure definitions, usable from both x86_64 and i386 * archs. */ #ifndef __ASSEMBLY__ #include <linux/types.h> /* 8 byte segment descriptor */ struct desc_struct { u16 limit0; u16 base0; u16 base1: 8, type: 4, s: 1, dpl: 2, p: 1; u16 limit1: 4, avl: 1, l: 1, d: 1, g: 1, base2: 8; } __attribute__((packed)); #define GDT_ENTRY_INIT(flags, base, limit) \ { \ .limit0 = (u16) (limit), \ .limit1 = ((limit) >> 16) & 0x0F, \ .base0 = (u16) (base), \ .base1 = ((base) >> 16) & 0xFF, \ .base2 = ((base) >> 24) & 0xFF, \ .type = (flags & 0x0f), \ .s = (flags >> 4) & 0x01, \ .dpl = (flags >> 5) & 0x03, \ .p = (flags >> 7) & 0x01, \ .avl = (flags >> 12) & 0x01, \ .l = (flags >> 13) & 0x01, \ .d = (flags >> 14) & 0x01, \ .g = (flags >> 15) & 0x01, \ } enum { GATE_INTERRUPT = 0xE, GATE_TRAP = 0xF, GATE_CALL = 0xC, GATE_TASK = 0x5, }; enum { DESC_TSS = 0x9, DESC_LDT = 0x2, DESCTYPE_S = 0x10, /* !system */ }; /* LDT or TSS descriptor in the GDT. */ struct ldttss_desc { u16 limit0; u16 base0; u16 base1 : 8, type : 5, dpl : 2, p : 1; u16 limit1 : 4, zero0 : 3, g : 1, base2 : 8; #ifdef CONFIG_X86_64 u32 base3; u32 zero1; #endif } __attribute__((packed)); typedef struct ldttss_desc ldt_desc; typedef struct ldttss_desc tss_desc; struct idt_bits { u16 ist : 3, zero : 5, type : 5, dpl : 2, p : 1; } __attribute__((packed)); struct gate_struct { u16 offset_low; u16 segment; struct idt_bits bits; u16 offset_middle; #ifdef CONFIG_X86_64 u32 offset_high; u32 reserved; #endif } __attribute__((packed)); typedef struct gate_struct gate_desc; static inline unsigned long gate_offset(const gate_desc *g) { #ifdef CONFIG_X86_64 return g->offset_low | ((unsigned long)g->offset_middle << 16) | ((unsigned long) g->offset_high << 32); #else return g->offset_low | ((unsigned long)g->offset_middle << 16); #endif } static inline unsigned long gate_segment(const gate_desc *g) { return g->segment; } struct desc_ptr { unsigned short size; unsigned long address; } __attribute__((packed)) ; #endif /* !__ASSEMBLY__ */ /* Access rights as returned by LAR */ #define AR_TYPE_RODATA (0 * (1 << 9)) #define AR_TYPE_RWDATA (1 * (1 << 9)) #define AR_TYPE_RODATA_EXPDOWN (2 * (1 << 9)) #define AR_TYPE_RWDATA_EXPDOWN (3 * (1 << 9)) #define AR_TYPE_XOCODE (4 * (1 << 9)) #define AR_TYPE_XRCODE (5 * (1 << 9)) #define AR_TYPE_XOCODE_CONF (6 * (1 << 9)) #define AR_TYPE_XRCODE_CONF (7 * (1 << 9)) #define AR_TYPE_MASK (7 * (1 << 9)) #define AR_DPL0 (0 * (1 << 13)) #define AR_DPL3 (3 * (1 << 13)) #define AR_DPL_MASK (3 * (1 << 13)) #define AR_A (1 << 8) /* "Accessed" */ #define AR_S (1 << 12) /* If clear, "System" segment */ #define AR_P (1 << 15) /* "Present" */ #define AR_AVL (1 << 20) /* "AVaiLable" (no HW effect) */ #define AR_L (1 << 21) /* "Long mode" for code segments */ #define AR_DB (1 << 22) /* D/B, effect depends on type */ #define AR_G (1 << 23) /* "Granularity" (limit in pages) */ #endif /* _ASM_X86_DESC_DEFS_H */
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