136 lines
3.2 KiB
C
Executable file
136 lines
3.2 KiB
C
Executable file
/* 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 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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/* 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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