/* 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. */ /* * Low-level interface mapping flags/field names to bits */ /* Flags for _DESC_S (non-system) descriptors */ #define _DESC_ACCESSED … #define _DESC_DATA_WRITABLE … #define _DESC_CODE_READABLE … #define _DESC_DATA_EXPAND_DOWN … #define _DESC_CODE_CONFORMING … #define _DESC_CODE_EXECUTABLE … /* Common flags */ #define _DESC_S … #define _DESC_DPL(dpl) … #define _DESC_PRESENT … #define _DESC_LONG_CODE … #define _DESC_DB … #define _DESC_GRANULARITY_4K … /* System descriptors have a numeric "type" field instead of flags */ #define _DESC_SYSTEM(code) … /* * High-level interface mapping intended usage to low-level combinations * of flags */ #define _DESC_DATA … #define _DESC_CODE … #define DESC_DATA16 … #define DESC_CODE16 … #define DESC_DATA32 … #define DESC_DATA32_BIOS … #define DESC_CODE32 … #define DESC_CODE32_BIOS … #define DESC_TSS32 … #define DESC_DATA64 … #define DESC_CODE64 … #define DESC_USER … #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 … 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 idt_data { unsigned int vector; unsigned int segment; struct idt_bits bits; const void *addr; }; 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; #ifndef _SETUP 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; } #endif struct desc_ptr { unsigned short size; unsigned long address; } __attribute__((packed)) ; #endif /* !__ASSEMBLY__ */ /* Boot IDT definitions */ #define BOOT_IDT_ENTRIES … /* Access rights as returned by LAR */ #define AR_TYPE_RODATA … #define AR_TYPE_RWDATA … #define AR_TYPE_RODATA_EXPDOWN … #define AR_TYPE_RWDATA_EXPDOWN … #define AR_TYPE_XOCODE … #define AR_TYPE_XRCODE … #define AR_TYPE_XOCODE_CONF … #define AR_TYPE_XRCODE_CONF … #define AR_TYPE_MASK … #define AR_DPL0 … #define AR_DPL3 … #define AR_DPL_MASK … #define AR_A … #define AR_S … #define AR_P … #define AR_AVL … #define AR_L … #define AR_DB … #define AR_G … #endif /* _ASM_X86_DESC_DEFS_H */
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