1 /* Written 2000 by Andi Kleen */
2 #ifndef __ARCH_DESC_DEFS_H
3 #define __ARCH_DESC_DEFS_H
6 * Segment descriptor structure definitions, usable from both x86_64 and i386
12 #include <linux/types.h>
14 // 8 byte segment descriptor
18 unsigned base1 : 8, type : 4, s : 1, dpl : 2, p : 1;
19 unsigned limit : 4, avl : 1, l : 1, d : 1, g : 1, base2 : 8;
20 } __attribute__((packed));
22 struct n_desc_struct {
36 unsigned ist : 3, zero0 : 5, type : 5, dpl : 2, p : 1;
40 } __attribute__((packed));
42 #define PTR_LOW(x) ((unsigned long)(x) & 0xFFFF)
43 #define PTR_MIDDLE(x) (((unsigned long)(x) >> 16) & 0xFFFF)
44 #define PTR_HIGH(x) ((unsigned long)(x) >> 32)
51 // LDT or TSS descriptor in the GDT. 16 bytes.
55 unsigned base1 : 8, type : 5, dpl : 2, p : 1;
56 unsigned limit1 : 4, zero0 : 3, g : 1, base2 : 8;
59 } __attribute__((packed));
63 unsigned long address;
64 } __attribute__((packed)) ;
67 #endif /* !__ASSEMBLY__ */