1/* SPDX-License-Identifier: GPL-2.0 */
2/* Written 2000 by Andi Kleen */
3#ifndef _ASM_X86_DESC_DEFS_H
4#define _ASM_X86_DESC_DEFS_H
5
6/*
7 * Segment descriptor structure definitions, usable from both x86_64 and i386
8 * archs.
9 */
10
11#ifndef __ASSEMBLY__
12
13#include <linux/types.h>
14
15/* 8 byte segment descriptor */
16struct desc_struct {
17	u16	limit0;
18	u16	base0;
19	u16	base1: 8, type: 4, s: 1, dpl: 2, p: 1;
20	u16	limit1: 4, avl: 1, l: 1, d: 1, g: 1, base2: 8;
21} __attribute__((packed));
22
23#define GDT_ENTRY_INIT(flags, base, limit)			\
24	{							\
25		.limit0		= (u16) (limit),		\
26		.limit1		= ((limit) >> 16) & 0x0F,	\
27		.base0		= (u16) (base),			\
28		.base1		= ((base) >> 16) & 0xFF,	\
29		.base2		= ((base) >> 24) & 0xFF,	\
30		.type		= (flags & 0x0f),		\
31		.s		= (flags >> 4) & 0x01,		\
32		.dpl		= (flags >> 5) & 0x03,		\
33		.p		= (flags >> 7) & 0x01,		\
34		.avl		= (flags >> 12) & 0x01,		\
35		.l		= (flags >> 13) & 0x01,		\
36		.d		= (flags >> 14) & 0x01,		\
37		.g		= (flags >> 15) & 0x01,		\
38	}
39
40enum {
41	GATE_INTERRUPT = 0xE,
42	GATE_TRAP = 0xF,
43	GATE_CALL = 0xC,
44	GATE_TASK = 0x5,
45};
46
47enum {
48	DESC_TSS = 0x9,
49	DESC_LDT = 0x2,
50	DESCTYPE_S = 0x10,	/* !system */
51};
52
53/* LDT or TSS descriptor in the GDT. */
54struct ldttss_desc {
55	u16	limit0;
56	u16	base0;
57
58	u16	base1 : 8, type : 5, dpl : 2, p : 1;
59	u16	limit1 : 4, zero0 : 3, g : 1, base2 : 8;
60#ifdef CONFIG_X86_64
61	u32	base3;
62	u32	zero1;
63#endif
64} __attribute__((packed));
65
66typedef struct ldttss_desc ldt_desc;
67typedef struct ldttss_desc tss_desc;
68
69struct idt_bits {
70	u16		ist	: 3,
71			zero	: 5,
72			type	: 5,
73			dpl	: 2,
74			p	: 1;
75} __attribute__((packed));
76
77struct idt_data {
78	unsigned int	vector;
79	unsigned int	segment;
80	struct idt_bits	bits;
81	const void	*addr;
82};
83
84struct gate_struct {
85	u16		offset_low;
86	u16		segment;
87	struct idt_bits	bits;
88	u16		offset_middle;
89#ifdef CONFIG_X86_64
90	u32		offset_high;
91	u32		reserved;
92#endif
93} __attribute__((packed));
94
95typedef struct gate_struct gate_desc;
96
97static inline unsigned long gate_offset(const gate_desc *g)
98{
99#ifdef CONFIG_X86_64
100	return g->offset_low | ((unsigned long)g->offset_middle << 16) |
101		((unsigned long) g->offset_high << 32);
102#else
103	return g->offset_low | ((unsigned long)g->offset_middle << 16);
104#endif
105}
106
107static inline unsigned long gate_segment(const gate_desc *g)
108{
109	return g->segment;
110}
111
112struct desc_ptr {
113	unsigned short size;
114	unsigned long address;
115} __attribute__((packed)) ;
116
117#endif /* !__ASSEMBLY__ */
118
119/* Boot IDT definitions */
120#define	BOOT_IDT_ENTRIES	32
121
122/* Access rights as returned by LAR */
123#define AR_TYPE_RODATA		(0 * (1 << 9))
124#define AR_TYPE_RWDATA		(1 * (1 << 9))
125#define AR_TYPE_RODATA_EXPDOWN	(2 * (1 << 9))
126#define AR_TYPE_RWDATA_EXPDOWN	(3 * (1 << 9))
127#define AR_TYPE_XOCODE		(4 * (1 << 9))
128#define AR_TYPE_XRCODE		(5 * (1 << 9))
129#define AR_TYPE_XOCODE_CONF	(6 * (1 << 9))
130#define AR_TYPE_XRCODE_CONF	(7 * (1 << 9))
131#define AR_TYPE_MASK		(7 * (1 << 9))
132
133#define AR_DPL0			(0 * (1 << 13))
134#define AR_DPL3			(3 * (1 << 13))
135#define AR_DPL_MASK		(3 * (1 << 13))
136
137#define AR_A			(1 << 8)   /* "Accessed" */
138#define AR_S			(1 << 12)  /* If clear, "System" segment */
139#define AR_P			(1 << 15)  /* "Present" */
140#define AR_AVL			(1 << 20)  /* "AVaiLable" (no HW effect) */
141#define AR_L			(1 << 21)  /* "Long mode" for code segments */
142#define AR_DB			(1 << 22)  /* D/B, effect depends on type */
143#define AR_G			(1 << 23)  /* "Granularity" (limit in pages) */
144
145#endif /* _ASM_X86_DESC_DEFS_H */
146