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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
14struct mmu_context_skas;
15extern void ldt_host_info(void);
16extern long init_new_ldt(struct mmu_context_skas * to_mm,
17 struct mmu_context_skas * from_mm);
18extern 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
27struct ldt_entry {
28 __u32 a;
29 __u32 b;
30};
31
32typedef 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];
38 } u;
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