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 modify_ldt_ldt_s { 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 37