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_H
 9#define __ASM_LDT_H
10
11#include <linux/mutex.h>
12#include <asm/ldt.h>
13
14extern 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
23struct ldt_entry {
24	__u32 a;
25	__u32 b;
26};
27
28typedef 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
68struct uml_arch_mm_context {
69	uml_ldt_t ldt;
70};
71
72#endif

 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_H
 9#define __ASM_LDT_H
10
11#include <linux/mutex.h>
12#include <asm/ldt.h>
13
14extern 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
23struct ldt_entry {
24	__u32 a;
25	__u32 b;
26};
27
28typedef 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
68struct uml_arch_mm_context {
69	uml_ldt_t ldt;
70};
71
72#endif