include/asm-um/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 "asm/semaphore.h"
  12 #include "asm/host_ldt.h"
  13
  14 struct mmu_context_skas;
  15 extern void ldt_host_info(void);
  16 extern long init_new_ldt(struct mmu_context_skas * to_mm,
  17                          struct mmu_context_skas * from_mm);
  18 extern 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
  27 struct ldt_entry {
  28         __u32 a;
  29         __u32 b;
  30 };
  31
  32 typedef 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 #endif