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858259cf BS |
1 | /* |
2 | * Copyright (C) 2004 Fujitsu Siemens Computers GmbH | |
3 | * Licensed under the GPL | |
4 | * | |
5 | * Author: Bodo Stroesser <bstroesser@fujitsu-siemens.com> | |
6 | */ | |
7 | ||
8 | #ifndef __ASM_LDT_I386_H | |
9 | #define __ASM_LDT_I386_H | |
10 | ||
11 | #include "asm/semaphore.h" | |
12 | #include "asm/arch/ldt.h" | |
13 | ||
14 | struct mmu_context_skas; | |
15 | extern void ldt_host_info(void); | |
16 | extern long init_new_ldt(struct mmu_context_skas * to_mm, | |
17 | struct mmu_context_skas * from_mm); | |
18 | extern void free_ldt(struct mmu_context_skas * mm); | |
19 | ||
20 | #define LDT_PAGES_MAX \ | |
21 | ((LDT_ENTRIES * LDT_ENTRY_SIZE)/PAGE_SIZE) | |
22 | #define LDT_ENTRIES_PER_PAGE \ | |
23 | (PAGE_SIZE/LDT_ENTRY_SIZE) | |
24 | #define LDT_DIRECT_ENTRIES \ | |
25 | ((LDT_PAGES_MAX*sizeof(void *))/LDT_ENTRY_SIZE) | |
26 | ||
27 | struct ldt_entry { | |
28 | __u32 a; | |
29 | __u32 b; | |
30 | }; | |
31 | ||
32 | typedef struct uml_ldt { | |
33 | int entry_count; | |
34 | struct semaphore semaphore; | |
35 | union { | |
36 | struct ldt_entry * pages[LDT_PAGES_MAX]; | |
37 | struct ldt_entry entries[LDT_DIRECT_ENTRIES]; | |
e23181de | 38 | } u; |
858259cf BS |
39 | } uml_ldt_t; |
40 | ||
41 | /* | |
42 | * macros stolen from include/asm-i386/desc.h | |
43 | */ | |
44 | #define LDT_entry_a(info) \ | |
45 | ((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff)) | |
46 | ||
47 | #define LDT_entry_b(info) \ | |
48 | (((info)->base_addr & 0xff000000) | \ | |
49 | (((info)->base_addr & 0x00ff0000) >> 16) | \ | |
50 | ((info)->limit & 0xf0000) | \ | |
51 | (((info)->read_exec_only ^ 1) << 9) | \ | |
52 | ((info)->contents << 10) | \ | |
53 | (((info)->seg_not_present ^ 1) << 15) | \ | |
54 | ((info)->seg_32bit << 22) | \ | |
55 | ((info)->limit_in_pages << 23) | \ | |
56 | ((info)->useable << 20) | \ | |
57 | 0x7000) | |
58 | ||
59 | #define LDT_empty(info) (\ | |
60 | (info)->base_addr == 0 && \ | |
61 | (info)->limit == 0 && \ | |
62 | (info)->contents == 0 && \ | |
63 | (info)->read_exec_only == 1 && \ | |
64 | (info)->seg_32bit == 0 && \ | |
65 | (info)->limit_in_pages == 0 && \ | |
66 | (info)->seg_not_present == 1 && \ | |
67 | (info)->useable == 0 ) | |
68 | ||
69 | #endif |