0,0 → 1,101 |
/* Written 2000 by Andi Kleen */ |
#ifndef _ASM_X86_DESC_DEFS_H |
#define _ASM_X86_DESC_DEFS_H |
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/* |
* Segment descriptor structure definitions, usable from both x86_64 and i386 |
* archs. |
*/ |
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#ifndef __ASSEMBLY__ |
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#include <linux/types.h> |
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/* |
* FIXME: Accessing the desc_struct through its fields is more elegant, |
* and should be the one valid thing to do. However, a lot of open code |
* still touches the a and b accessors, and doing this allow us to do it |
* incrementally. We keep the signature as a struct, rather than an union, |
* so we can get rid of it transparently in the future -- glommer |
*/ |
/* 8 byte segment descriptor */ |
struct desc_struct { |
union { |
struct { |
unsigned int a; |
unsigned int b; |
}; |
struct { |
u16 limit0; |
u16 base0; |
unsigned base1: 8, type: 4, s: 1, dpl: 2, p: 1; |
unsigned limit: 4, avl: 1, l: 1, d: 1, g: 1, base2: 8; |
}; |
}; |
} __attribute__((packed)); |
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#define GDT_ENTRY_INIT(flags, base, limit) { { { \ |
.a = ((limit) & 0xffff) | (((base) & 0xffff) << 16), \ |
.b = (((base) & 0xff0000) >> 16) | (((flags) & 0xf0ff) << 8) | \ |
((limit) & 0xf0000) | ((base) & 0xff000000), \ |
} } } |
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enum { |
GATE_INTERRUPT = 0xE, |
GATE_TRAP = 0xF, |
GATE_CALL = 0xC, |
GATE_TASK = 0x5, |
}; |
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/* 16byte gate */ |
struct gate_struct64 { |
u16 offset_low; |
u16 segment; |
unsigned ist : 3, zero0 : 5, type : 5, dpl : 2, p : 1; |
u16 offset_middle; |
u32 offset_high; |
u32 zero1; |
} __attribute__((packed)); |
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#define PTR_LOW(x) ((unsigned long long)(x) & 0xFFFF) |
#define PTR_MIDDLE(x) (((unsigned long long)(x) >> 16) & 0xFFFF) |
#define PTR_HIGH(x) ((unsigned long long)(x) >> 32) |
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enum { |
DESC_TSS = 0x9, |
DESC_LDT = 0x2, |
DESCTYPE_S = 0x10, /* !system */ |
}; |
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/* LDT or TSS descriptor in the GDT. 16 bytes. */ |
struct ldttss_desc64 { |
u16 limit0; |
u16 base0; |
unsigned base1 : 8, type : 5, dpl : 2, p : 1; |
unsigned limit1 : 4, zero0 : 3, g : 1, base2 : 8; |
u32 base3; |
u32 zero1; |
} __attribute__((packed)); |
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#ifdef CONFIG_X86_64 |
typedef struct gate_struct64 gate_desc; |
typedef struct ldttss_desc64 ldt_desc; |
typedef struct ldttss_desc64 tss_desc; |
#define gate_offset(g) ((g).offset_low | ((unsigned long)(g).offset_middle << 16) | ((unsigned long)(g).offset_high << 32)) |
#define gate_segment(g) ((g).segment) |
#else |
typedef struct desc_struct gate_desc; |
typedef struct desc_struct ldt_desc; |
typedef struct desc_struct tss_desc; |
#define gate_offset(g) (((g).b & 0xffff0000) | ((g).a & 0x0000ffff)) |
#define gate_segment(g) ((g).a >> 16) |
#endif |
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struct desc_ptr { |
unsigned short size; |
unsigned long address; |
} __attribute__((packed)) ; |
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#endif /* !__ASSEMBLY__ */ |
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#endif /* _ASM_X86_DESC_DEFS_H */ |