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8 #ifndef __ASM_LDT_H
9 #define __ASM_LDT_H
10
11 #include <linux/mutex.h>
12 #include <asm/ldt.h>
13
14 extern void ldt_host_info(void);
15
16 #define LDT_PAGES_MAX \
17 ((LDT_ENTRIES * LDT_ENTRY_SIZE)/PAGE_SIZE)
18 #define LDT_ENTRIES_PER_PAGE \
19 (PAGE_SIZE/LDT_ENTRY_SIZE)
20 #define LDT_DIRECT_ENTRIES \
21 ((LDT_PAGES_MAX*sizeof(void *))/LDT_ENTRY_SIZE)
22
23 struct ldt_entry {
24 __u32 a;
25 __u32 b;
26 };
27
28 typedef struct uml_ldt {
29 int entry_count;
30 struct mutex lock;
31 union {
32 struct ldt_entry * pages[LDT_PAGES_MAX];
33 struct ldt_entry entries[LDT_DIRECT_ENTRIES];
34 } u;
35 } uml_ldt_t;
36
37 #define LDT_entry_a(info) \
38 ((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff))
39
40 #define LDT_entry_b(info) \
41 (((info)->base_addr & 0xff000000) | \
42 (((info)->base_addr & 0x00ff0000) >> 16) | \
43 ((info)->limit & 0xf0000) | \
44 (((info)->read_exec_only ^ 1) << 9) | \
45 ((info)->contents << 10) | \
46 (((info)->seg_not_present ^ 1) << 15) | \
47 ((info)->seg_32bit << 22) | \
48 ((info)->limit_in_pages << 23) | \
49 ((info)->useable << 20) | \
50 0x7000)
51
52 #define _LDT_empty(info) (\
53 (info)->base_addr == 0 && \
54 (info)->limit == 0 && \
55 (info)->contents == 0 && \
56 (info)->read_exec_only == 1 && \
57 (info)->seg_32bit == 0 && \
58 (info)->limit_in_pages == 0 && \
59 (info)->seg_not_present == 1 && \
60 (info)->useable == 0 )
61
62 #ifdef CONFIG_X86_64
63 #define LDT_empty(info) (_LDT_empty(info) && ((info)->lm == 0))
64 #else
65 #define LDT_empty(info) (_LDT_empty(info))
66 #endif
67
68 struct uml_arch_mm_context {
69 uml_ldt_t ldt;
70 };
71
72 #endif