Avi Kivity | 249e83f | 2006-12-07 02:14:04 +0100 | [diff] [blame] | 1 | /* Written 2000 by Andi Kleen */ |
| 2 | #ifndef __ARCH_DESC_DEFS_H |
| 3 | #define __ARCH_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 | |
Glauber de Oliveira Costa | 6842ef0 | 2008-01-30 13:31:11 +0100 | [diff] [blame] | 14 | /* |
| 15 | * FIXME: Acessing 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 acessors, 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 | */ |
Avi Kivity | 249e83f | 2006-12-07 02:14:04 +0100 | [diff] [blame] | 21 | // 8 byte segment descriptor |
| 22 | struct desc_struct { |
Glauber de Oliveira Costa | 6842ef0 | 2008-01-30 13:31:11 +0100 | [diff] [blame] | 23 | union { |
| 24 | struct { unsigned int a, b; }; |
| 25 | struct { |
| 26 | u16 limit0; |
| 27 | u16 base0; |
| 28 | unsigned base1: 8, type: 4, s: 1, dpl: 2, p: 1; |
| 29 | unsigned limit: 4, avl: 1, l: 1, d: 1, g: 1, base2: 8; |
| 30 | }; |
Avi Kivity | 249e83f | 2006-12-07 02:14:04 +0100 | [diff] [blame] | 31 | |
Glauber de Oliveira Costa | 6842ef0 | 2008-01-30 13:31:11 +0100 | [diff] [blame] | 32 | }; |
| 33 | } __attribute__((packed)); |
Avi Kivity | 249e83f | 2006-12-07 02:14:04 +0100 | [diff] [blame] | 34 | |
| 35 | enum { |
| 36 | GATE_INTERRUPT = 0xE, |
| 37 | GATE_TRAP = 0xF, |
| 38 | GATE_CALL = 0xC, |
| 39 | }; |
| 40 | |
| 41 | // 16byte gate |
Glauber de Oliveira Costa | 010d4f8 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 42 | struct gate_struct64 { |
Avi Kivity | 249e83f | 2006-12-07 02:14:04 +0100 | [diff] [blame] | 43 | u16 offset_low; |
| 44 | u16 segment; |
| 45 | unsigned ist : 3, zero0 : 5, type : 5, dpl : 2, p : 1; |
| 46 | u16 offset_middle; |
| 47 | u32 offset_high; |
| 48 | u32 zero1; |
| 49 | } __attribute__((packed)); |
| 50 | |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame^] | 51 | #define PTR_LOW(x) ((unsigned long long)(x) & 0xFFFF) |
| 52 | #define PTR_MIDDLE(x) (((unsigned long long)(x) >> 16) & 0xFFFF) |
| 53 | #define PTR_HIGH(x) ((unsigned long long)(x) >> 32) |
Avi Kivity | 249e83f | 2006-12-07 02:14:04 +0100 | [diff] [blame] | 54 | |
| 55 | enum { |
| 56 | DESC_TSS = 0x9, |
| 57 | DESC_LDT = 0x2, |
Glauber de Oliveira Costa | 59fbed7 | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 58 | DESCTYPE_TASK = 0x85, /* present, system, DPL-0, task gate */ |
| 59 | DESCTYPE_INT = 0x8e, /* present, system, DPL-0, interrupt gate */ |
| 60 | DESCTYPE_TRAP = 0x8f, /* present, system, DPL-0, trap gate */ |
| 61 | DESCTYPE_DPL3 = 0x60, /* DPL-3 */ |
| 62 | DESCTYPE_S = 0x10, /* !system */ |
Avi Kivity | 249e83f | 2006-12-07 02:14:04 +0100 | [diff] [blame] | 63 | }; |
| 64 | |
| 65 | // LDT or TSS descriptor in the GDT. 16 bytes. |
Glauber de Oliveira Costa | 25deca5 | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 66 | struct ldttss_desc64 { |
Avi Kivity | 249e83f | 2006-12-07 02:14:04 +0100 | [diff] [blame] | 67 | u16 limit0; |
| 68 | u16 base0; |
| 69 | unsigned base1 : 8, type : 5, dpl : 2, p : 1; |
| 70 | unsigned limit1 : 4, zero0 : 3, g : 1, base2 : 8; |
| 71 | u32 base3; |
| 72 | u32 zero1; |
| 73 | } __attribute__((packed)); |
| 74 | |
Glauber de Oliveira Costa | 010d4f8 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 75 | #ifdef CONFIG_X86_64 |
| 76 | typedef struct gate_struct64 gate_desc; |
Glauber de Oliveira Costa | 25deca5 | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 77 | typedef struct ldttss_desc64 ldt_desc; |
Glauber de Oliveira Costa | 18245d5 | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 78 | typedef struct ldttss_desc64 tss_desc; |
Glauber de Oliveira Costa | 010d4f8 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 79 | #else |
| 80 | typedef struct desc_struct gate_desc; |
Glauber de Oliveira Costa | 25deca5 | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 81 | typedef struct desc_struct ldt_desc; |
Glauber de Oliveira Costa | 18245d5 | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 82 | typedef struct desc_struct tss_desc; |
Glauber de Oliveira Costa | 010d4f8 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 83 | #endif |
| 84 | |
Avi Kivity | 249e83f | 2006-12-07 02:14:04 +0100 | [diff] [blame] | 85 | struct desc_ptr { |
| 86 | unsigned short size; |
| 87 | unsigned long address; |
| 88 | } __attribute__((packed)) ; |
| 89 | |
| 90 | |
| 91 | #endif /* !__ASSEMBLY__ */ |
| 92 | |
| 93 | #endif |