arch/um/include/shared/ldt.h

   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 <sysdep/host_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 #endif