125 lines
3.4 KiB
C
125 lines
3.4 KiB
C
/* 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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/*
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* FIXME: Accessing the desc_struct through its fields is more elegant,
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* and should be the one valid thing to do. However, a lot of open code
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* still touches the a and b accessors, and doing this allow us to do it
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* incrementally. We keep the signature as a struct, rather than an union,
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* so we can get rid of it transparently in the future -- glommer
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*/
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/* 8 byte segment descriptor */
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struct desc_struct {
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union {
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struct {
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unsigned int a;
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unsigned int b;
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};
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struct {
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u16 limit0;
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u16 base0;
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unsigned base1: 8, type: 4, s: 1, dpl: 2, p: 1;
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unsigned limit: 4, avl: 1, l: 1, d: 1, g: 1, base2: 8;
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};
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};
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} __attribute__((packed));
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#define GDT_ENTRY_INIT(flags, base, limit) { { { \
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.a = ((limit) & 0xffff) | (((base) & 0xffff) << 16), \
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.b = (((base) & 0xff0000) >> 16) | (((flags) & 0xf0ff) << 8) | \
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((limit) & 0xf0000) | ((base) & 0xff000000), \
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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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/* 16byte gate */
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struct gate_struct64 {
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u16 offset_low;
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u16 segment;
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unsigned ist : 3, zero0 : 5, type : 5, dpl : 2, p : 1;
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u16 offset_middle;
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u32 offset_high;
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u32 zero1;
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} __attribute__((packed));
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#define PTR_LOW(x) ((unsigned long long)(x) & 0xFFFF)
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#define PTR_MIDDLE(x) (((unsigned long long)(x) >> 16) & 0xFFFF)
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#define PTR_HIGH(x) ((unsigned long long)(x) >> 32)
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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. 16 bytes. */
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struct ldttss_desc64 {
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u16 limit0;
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u16 base0;
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unsigned base1 : 8, type : 5, dpl : 2, p : 1;
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unsigned limit1 : 4, zero0 : 3, g : 1, base2 : 8;
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u32 base3;
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u32 zero1;
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} __attribute__((packed));
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#ifdef CONFIG_X86_64
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typedef struct gate_struct64 gate_desc;
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typedef struct ldttss_desc64 ldt_desc;
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typedef struct ldttss_desc64 tss_desc;
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#define gate_offset(g) ((g).offset_low | ((unsigned long)(g).offset_middle << 16) | ((unsigned long)(g).offset_high << 32))
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#define gate_segment(g) ((g).segment)
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#else
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typedef struct desc_struct gate_desc;
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typedef struct desc_struct ldt_desc;
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typedef struct desc_struct tss_desc;
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#define gate_offset(g) (((g).b & 0xffff0000) | ((g).a & 0x0000ffff))
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#define gate_segment(g) ((g).a >> 16)
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#endif
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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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