/* Written 2000 by Andi Kleen */ #ifndef _ASM_X86_DESC_DEFS_H #define _ASM_X86_DESC_DEFS_H /* * Segment descriptor structure definitions, usable from both x86_64 and i386 * archs. */ #ifndef __ASSEMBLY__ #include <linux/types.h> /* * 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)); #define GDT_ENTRY_INIT(flags, base, limit) { { { \ .a = ((limit) & 0xffff) | (((base) & 0xffff) << 16), \ .b = (((base) & 0xff0000) >> 16) | (((flags) & 0xf0ff) << 8) | \ ((limit) & 0xf0000) | ((base) & 0xff000000), \ } } } enum { GATE_INTERRUPT = 0xE, GATE_TRAP = 0xF, GATE_CALL = 0xC, GATE_TASK = 0x5, }; /* 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)); #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) enum { DESC_TSS = 0x9, DESC_LDT = 0x2, DESCTYPE_S = 0x10, /* !system */ }; /* 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)); #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 struct desc_ptr { unsigned short size; unsigned long address; } __attribute__((packed)) ; #endif /* !__ASSEMBLY__ */ /* Access rights as returned by LAR */ #define AR_TYPE_RODATA (0 * (1 << 9)) #define AR_TYPE_RWDATA (1 * (1 << 9)) #define AR_TYPE_RODATA_EXPDOWN (2 * (1 << 9)) #define AR_TYPE_RWDATA_EXPDOWN (3 * (1 << 9)) #define AR_TYPE_XOCODE (4 * (1 << 9)) #define AR_TYPE_XRCODE (5 * (1 << 9)) #define AR_TYPE_XOCODE_CONF (6 * (1 << 9)) #define AR_TYPE_XRCODE_CONF (7 * (1 << 9)) #define AR_TYPE_MASK (7 * (1 << 9)) #define AR_DPL0 (0 * (1 << 13)) #define AR_DPL3 (3 * (1 << 13)) #define AR_DPL_MASK (3 * (1 << 13)) #define AR_A (1 << 8) /* "Accessed" */ #define AR_S (1 << 12) /* If clear, "System" segment */ #define AR_P (1 << 15) /* "Present" */ #define AR_AVL (1 << 20) /* "AVaiLable" (no HW effect) */ #define AR_L (1 << 21) /* "Long mode" for code segments */ #define AR_DB (1 << 22) /* D/B, effect depends on type */ #define AR_G (1 << 23) /* "Granularity" (limit in pages) */ #endif /* _ASM_X86_DESC_DEFS_H */