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