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1: /* Written 2000 by Andi Kleen */ 2: #ifndef _ASM_X86_DESC_DEFS_H 3: #define _ASM_X86_DESC_DEFS_H 4: 5: /* 6: * Segment descriptor structure definitions, usable from both x86_64 and i386 7: * archs. 8: */ 9: 10: #ifndef __ASSEMBLY__ 11: 12: #include <linux/types.h> 13: 14: /* 15: * FIXME: Accessing the desc_struct through its fields is more elegant, 16: * and should be the one valid thing to do. However, a lot of open code 17: * still touches the a and b accessors, and doing this allow us to do it 18: * incrementally. We keep the signature as a struct, rather than an union, 19: * so we can get rid of it transparently in the future -- glommer 20: */ 21: /* 8 byte segment descriptor */ 22: struct desc_struct { 23: union { 24: struct { 25: unsigned int a; 26: unsigned int b; 27: }; 28: struct { 29: u16 limit0; 30: u16 base0; 31: unsigned base1: 8, type: 4, s: 1, dpl: 2, p: 1; 32: unsigned limit: 4, avl: 1, l: 1, d: 1, g: 1, base2: 8; 33: }; 34: }; 35: } __attribute__((packed)); 36: 37: #define GDT_ENTRY_INIT(flags, base, limit) { { { \ 38: .a = ((limit) & 0xffff) | (((base) & 0xffff) << 16), \ 39: .b = (((base) & 0xff0000) >> 16) | (((flags) & 0xf0ff) << 8) | \ 40: ((limit) & 0xf0000) | ((base) & 0xff000000), \ 41: } } } 42: 43: enum { 44: GATE_INTERRUPT = 0xE, 45: GATE_TRAP = 0xF, 46: GATE_CALL = 0xC, 47: GATE_TASK = 0x5, 48: }; 49: 50: /* 16byte gate */ 51: struct gate_struct64 { 52: u16 offset_low; 53: u16 segment; 54: unsigned ist : 3, zero0 : 5, type : 5, dpl : 2, p : 1; 55: u16 offset_middle; 56: u32 offset_high; 57: u32 zero1; 58: } __attribute__((packed)); 59: 60: #define PTR_LOW(x) ((unsigned long long)(x) & 0xFFFF) 61: #define PTR_MIDDLE(x) (((unsigned long long)(x) >> 16) & 0xFFFF) 62: #define PTR_HIGH(x) ((unsigned long long)(x) >> 32) 63: 64: enum { 65: DESC_TSS = 0x9, 66: DESC_LDT = 0x2, 67: DESCTYPE_S = 0x10, /* !system */ 68: }; 69: 70: /* LDT or TSS descriptor in the GDT. 16 bytes. */ 71: struct ldttss_desc64 { 72: u16 limit0; 73: u16 base0; 74: unsigned base1 : 8, type : 5, dpl : 2, p : 1; 75: unsigned limit1 : 4, zero0 : 3, g : 1, base2 : 8; 76: u32 base3; 77: u32 zero1; 78: } __attribute__((packed)); 79: 80: #ifdef CONFIG_X86_64 81: typedef struct gate_struct64 gate_desc; 82: typedef struct ldttss_desc64 ldt_desc; 83: typedef struct ldttss_desc64 tss_desc; 84: #define gate_offset(g) ((g).offset_low | ((unsigned long)(g).offset_middle << 16) | ((unsigned long)(g).offset_high << 32)) 85: #define gate_segment(g) ((g).segment) 86: #else 87: typedef struct desc_struct gate_desc; 88: typedef struct desc_struct ldt_desc; 89: typedef struct desc_struct tss_desc; 90: #define gate_offset(g) (((g).b & 0xffff0000) | ((g).a & 0x0000ffff)) 91: #define gate_segment(g) ((g).a >> 16) 92: #endif 93: 94: struct desc_ptr { 95: unsigned short size; 96: unsigned long address; 97: } __attribute__((packed)) ; 98: 99: #endif /* !__ASSEMBLY__ */ 100: 101: #endif /* _ASM_X86_DESC_DEFS_H */ 102: