include/asm-x86_64/ldt.h

   1 /*
   2  * ldt.h
   3  *
   4  * Definitions of structures used with the modify_ldt system call.
   5  */
   6 #ifndef _LINUX_LDT_H
   7 #define _LINUX_LDT_H
   8
   9 /* Maximum number of LDT entries supported. */
  10 #define LDT_ENTRIES     8192
  11 /* The size of each LDT entry. */
  12 #define LDT_ENTRY_SIZE  8
  13
  14 #ifndef __ASSEMBLY__
  15 /* Note on 64bit base and limit is ignored and you cannot set
  16    DS/ES/CS not to the default values if you still want to do syscalls. This
  17    call is more for 32bit mode therefore. */
  18 struct user_desc {
  19         unsigned int  entry_number;
  20         unsigned int  base_addr;
  21         unsigned int  limit;
  22         unsigned int  seg_32bit:1;
  23         unsigned int  contents:2;
  24         unsigned int  read_exec_only:1;
  25         unsigned int  limit_in_pages:1;
  26         unsigned int  seg_not_present:1;
  27         unsigned int  useable:1;
  28         unsigned int  lm:1;
  29 };
  30
  31 #define MODIFY_LDT_CONTENTS_DATA        0
  32 #define MODIFY_LDT_CONTENTS_STACK       1
  33 #define MODIFY_LDT_CONTENTS_CODE        2
  34
  35 #endif /* !__ASSEMBLY__ */
  36 #endif