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      1 /*
      2  * ldt.h
      3  *
      4  * Definitions of structures used with the modify_ldt system call.
      5  */
      6 #ifndef _ASM_X86_LDT_H
      7 #define _ASM_X86_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 /*
     16  * Note on 64bit base and limit is ignored and you cannot set DS/ES/CS
     17  * not to the default values if you still want to do syscalls. This
     18  * call is more for 32bit mode therefore.
     19  */
     20 struct user_desc {
     21 	unsigned int  entry_number;
     22 	unsigned int  base_addr;
     23 	unsigned int  limit;
     24 	unsigned int  seg_32bit:1;
     25 	unsigned int  contents:2;
     26 	unsigned int  read_exec_only:1;
     27 	unsigned int  limit_in_pages:1;
     28 	unsigned int  seg_not_present:1;
     29 	unsigned int  useable:1;
     30 #ifdef __x86_64__
     31 	unsigned int  lm:1;
     32 #endif
     33 };
     34 
     35 #define MODIFY_LDT_CONTENTS_DATA	0
     36 #define MODIFY_LDT_CONTENTS_STACK	1
     37 #define MODIFY_LDT_CONTENTS_CODE	2
     38 
     39 #endif /* !__ASSEMBLY__ */
     40 #endif
     41