xref: /openbmc/linux/arch/x86/um/asm/mm_context.h (revision c900529f3d9161bfde5cca0754f83b4d3c3e0220)
1*b3ee571eSAl Viro /*
2*b3ee571eSAl Viro  * Copyright (C) 2004 Fujitsu Siemens Computers GmbH
3*b3ee571eSAl Viro  * Licensed under the GPL
4*b3ee571eSAl Viro  *
5*b3ee571eSAl Viro  * Author: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
6*b3ee571eSAl Viro  */
7*b3ee571eSAl Viro 
8*b3ee571eSAl Viro #ifndef __ASM_LDT_H
9*b3ee571eSAl Viro #define __ASM_LDT_H
10*b3ee571eSAl Viro 
11*b3ee571eSAl Viro #include <linux/mutex.h>
12*b3ee571eSAl Viro #include <asm/ldt.h>
13*b3ee571eSAl Viro 
14*b3ee571eSAl Viro #define LDT_PAGES_MAX \
15*b3ee571eSAl Viro 	((LDT_ENTRIES * LDT_ENTRY_SIZE)/PAGE_SIZE)
16*b3ee571eSAl Viro #define LDT_ENTRIES_PER_PAGE \
17*b3ee571eSAl Viro 	(PAGE_SIZE/LDT_ENTRY_SIZE)
18*b3ee571eSAl Viro #define LDT_DIRECT_ENTRIES \
19*b3ee571eSAl Viro 	((LDT_PAGES_MAX*sizeof(void *))/LDT_ENTRY_SIZE)
20*b3ee571eSAl Viro 
21*b3ee571eSAl Viro struct ldt_entry {
22*b3ee571eSAl Viro 	__u32 a;
23*b3ee571eSAl Viro 	__u32 b;
24*b3ee571eSAl Viro };
25*b3ee571eSAl Viro 
26*b3ee571eSAl Viro typedef struct uml_ldt {
27*b3ee571eSAl Viro 	int entry_count;
28*b3ee571eSAl Viro 	struct mutex lock;
29*b3ee571eSAl Viro 	union {
30*b3ee571eSAl Viro 		struct ldt_entry * pages[LDT_PAGES_MAX];
31*b3ee571eSAl Viro 		struct ldt_entry entries[LDT_DIRECT_ENTRIES];
32*b3ee571eSAl Viro 	} u;
33*b3ee571eSAl Viro } uml_ldt_t;
34*b3ee571eSAl Viro 
35*b3ee571eSAl Viro #define LDT_entry_a(info) \
36*b3ee571eSAl Viro 	((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff))
37*b3ee571eSAl Viro 
38*b3ee571eSAl Viro #define LDT_entry_b(info) \
39*b3ee571eSAl Viro 	(((info)->base_addr & 0xff000000) | \
40*b3ee571eSAl Viro 	(((info)->base_addr & 0x00ff0000) >> 16) | \
41*b3ee571eSAl Viro 	((info)->limit & 0xf0000) | \
42*b3ee571eSAl Viro 	(((info)->read_exec_only ^ 1) << 9) | \
43*b3ee571eSAl Viro 	((info)->contents << 10) | \
44*b3ee571eSAl Viro 	(((info)->seg_not_present ^ 1) << 15) | \
45*b3ee571eSAl Viro 	((info)->seg_32bit << 22) | \
46*b3ee571eSAl Viro 	((info)->limit_in_pages << 23) | \
47*b3ee571eSAl Viro 	((info)->useable << 20) | \
48*b3ee571eSAl Viro 	0x7000)
49*b3ee571eSAl Viro 
50*b3ee571eSAl Viro #define _LDT_empty(info) (\
51*b3ee571eSAl Viro 	(info)->base_addr	== 0	&& \
52*b3ee571eSAl Viro 	(info)->limit		== 0	&& \
53*b3ee571eSAl Viro 	(info)->contents	== 0	&& \
54*b3ee571eSAl Viro 	(info)->read_exec_only	== 1	&& \
55*b3ee571eSAl Viro 	(info)->seg_32bit	== 0	&& \
56*b3ee571eSAl Viro 	(info)->limit_in_pages	== 0	&& \
57*b3ee571eSAl Viro 	(info)->seg_not_present	== 1	&& \
58*b3ee571eSAl Viro 	(info)->useable		== 0	)
59*b3ee571eSAl Viro 
60*b3ee571eSAl Viro #ifdef CONFIG_X86_64
61*b3ee571eSAl Viro #define LDT_empty(info) (_LDT_empty(info) && ((info)->lm == 0))
62*b3ee571eSAl Viro #else
63*b3ee571eSAl Viro #define LDT_empty(info) (_LDT_empty(info))
64*b3ee571eSAl Viro #endif
65*b3ee571eSAl Viro 
66*b3ee571eSAl Viro struct uml_arch_mm_context {
67*b3ee571eSAl Viro 	uml_ldt_t ldt;
68*b3ee571eSAl Viro };
69*b3ee571eSAl Viro 
70*b3ee571eSAl Viro #endif
71