Avi Kivity | 249e83f | 2006-12-07 02:14:04 +0100 | [diff] [blame] | 1 | /* Written 2000 by Andi Kleen */ |
H. Peter Anvin | 1965aae | 2008-10-22 22:26:29 -0700 | [diff] [blame] | 2 | #ifndef _ASM_X86_DESC_DEFS_H |
| 3 | #define _ASM_X86_DESC_DEFS_H |
Avi Kivity | 249e83f | 2006-12-07 02:14:04 +0100 | [diff] [blame] | 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 | /* |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 15 | * FIXME: Accessing the desc_struct through its fields is more elegant, |
Glauber de Oliveira Costa | 6842ef0 | 2008-01-30 13:31:11 +0100 | [diff] [blame] | 16 | * and should be the one valid thing to do. However, a lot of open code |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 17 | * still touches the a and b accessors, and doing this allow us to do it |
Glauber de Oliveira Costa | 6842ef0 | 2008-01-30 13:31:11 +0100 | [diff] [blame] | 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 | */ |
Joe Perches | b776190 | 2008-03-23 01:01:57 -0700 | [diff] [blame] | 21 | /* 8 byte segment descriptor */ |
Avi Kivity | 249e83f | 2006-12-07 02:14:04 +0100 | [diff] [blame] | 22 | struct desc_struct { |
Glauber de Oliveira Costa | 6842ef0 | 2008-01-30 13:31:11 +0100 | [diff] [blame] | 23 | union { |
Joe Perches | b776190 | 2008-03-23 01:01:57 -0700 | [diff] [blame] | 24 | struct { |
| 25 | unsigned int a; |
| 26 | unsigned int b; |
| 27 | }; |
Glauber de Oliveira Costa | 6842ef0 | 2008-01-30 13:31:11 +0100 | [diff] [blame] | 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 | }; |
Glauber de Oliveira Costa | 6842ef0 | 2008-01-30 13:31:11 +0100 | [diff] [blame] | 34 | }; |
| 35 | } __attribute__((packed)); |
Avi Kivity | 249e83f | 2006-12-07 02:14:04 +0100 | [diff] [blame] | 36 | |
Akinobu Mita | 1e5de18 | 2009-07-19 00:12:20 +0900 | [diff] [blame] | 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 | |
Avi Kivity | 249e83f | 2006-12-07 02:14:04 +0100 | [diff] [blame] | 43 | enum { |
| 44 | GATE_INTERRUPT = 0xE, |
| 45 | GATE_TRAP = 0xF, |
| 46 | GATE_CALL = 0xC, |
Glauber de Oliveira Costa | 507f90c | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 47 | GATE_TASK = 0x5, |
Avi Kivity | 249e83f | 2006-12-07 02:14:04 +0100 | [diff] [blame] | 48 | }; |
| 49 | |
Joe Perches | b776190 | 2008-03-23 01:01:57 -0700 | [diff] [blame] | 50 | /* 16byte gate */ |
Glauber de Oliveira Costa | 010d4f8 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 51 | struct gate_struct64 { |
Avi Kivity | 249e83f | 2006-12-07 02:14:04 +0100 | [diff] [blame] | 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 | |
Glauber de Oliveira Costa | 54cd0ea | 2008-01-30 13:31:14 +0100 | [diff] [blame] | 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) |
Avi Kivity | 249e83f | 2006-12-07 02:14:04 +0100 | [diff] [blame] | 63 | |
| 64 | enum { |
| 65 | DESC_TSS = 0x9, |
| 66 | DESC_LDT = 0x2, |
Joe Perches | b776190 | 2008-03-23 01:01:57 -0700 | [diff] [blame] | 67 | DESCTYPE_S = 0x10, /* !system */ |
Avi Kivity | 249e83f | 2006-12-07 02:14:04 +0100 | [diff] [blame] | 68 | }; |
| 69 | |
Joe Perches | b776190 | 2008-03-23 01:01:57 -0700 | [diff] [blame] | 70 | /* LDT or TSS descriptor in the GDT. 16 bytes. */ |
Glauber de Oliveira Costa | 25deca5 | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 71 | struct ldttss_desc64 { |
Avi Kivity | 249e83f | 2006-12-07 02:14:04 +0100 | [diff] [blame] | 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 | |
Glauber de Oliveira Costa | 010d4f8 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 80 | #ifdef CONFIG_X86_64 |
| 81 | typedef struct gate_struct64 gate_desc; |
Glauber de Oliveira Costa | 25deca5 | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 82 | typedef struct ldttss_desc64 ldt_desc; |
Glauber de Oliveira Costa | 18245d5 | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 83 | typedef struct ldttss_desc64 tss_desc; |
Jeremy Fitzhardinge | 43adfc2 | 2008-06-25 00:19:04 -0400 | [diff] [blame] | 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) |
Glauber de Oliveira Costa | 010d4f8 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 86 | #else |
| 87 | typedef struct desc_struct gate_desc; |
Glauber de Oliveira Costa | 25deca5 | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 88 | typedef struct desc_struct ldt_desc; |
Glauber de Oliveira Costa | 18245d5 | 2008-01-30 13:31:13 +0100 | [diff] [blame] | 89 | typedef struct desc_struct tss_desc; |
Jeremy Fitzhardinge | 43adfc2 | 2008-06-25 00:19:04 -0400 | [diff] [blame] | 90 | #define gate_offset(g) (((g).b & 0xffff0000) | ((g).a & 0x0000ffff)) |
| 91 | #define gate_segment(g) ((g).a >> 16) |
Glauber de Oliveira Costa | 010d4f8 | 2008-01-30 13:31:12 +0100 | [diff] [blame] | 92 | #endif |
| 93 | |
Avi Kivity | 249e83f | 2006-12-07 02:14:04 +0100 | [diff] [blame] | 94 | struct desc_ptr { |
| 95 | unsigned short size; |
| 96 | unsigned long address; |
| 97 | } __attribute__((packed)) ; |
| 98 | |
Avi Kivity | 249e83f | 2006-12-07 02:14:04 +0100 | [diff] [blame] | 99 | #endif /* !__ASSEMBLY__ */ |
| 100 | |
H. Peter Anvin | 1965aae | 2008-10-22 22:26:29 -0700 | [diff] [blame] | 101 | #endif /* _ASM_X86_DESC_DEFS_H */ |