91 lines
2.0 KiB
C
91 lines
2.0 KiB
C
/* Written 2000 by Andi Kleen */
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#ifndef __ARCH_DESC_DEFS_H
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#define __ARCH_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: Acessing 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 acessors, 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 { unsigned int a, b; };
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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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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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#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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#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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#endif
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