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- /*
- * ldt.h
- *
- * Definitions of structures used with the modify_ldt system call.
- */
- #ifndef _ASM_X86_LDT_H
- #define _ASM_X86_LDT_H
- /* Maximum number of LDT entries supported. */
- #define LDT_ENTRIES 8192
- /* The size of each LDT entry. */
- #define LDT_ENTRY_SIZE 8
- #ifndef __ASSEMBLY__
- /*
- * Note on 64bit base and limit is ignored and you cannot set DS/ES/CS
- * not to the default values if you still want to do syscalls. This
- * call is more for 32bit mode therefore.
- */
- struct user_desc {
- unsigned int entry_number;
- unsigned int base_addr;
- unsigned int limit;
- unsigned int seg_32bit:1;
- unsigned int contents:2;
- unsigned int read_exec_only:1;
- unsigned int limit_in_pages:1;
- unsigned int seg_not_present:1;
- unsigned int useable:1;
- #ifdef __x86_64__
- /*
- * Because this bit is not present in 32-bit user code, user
- * programs can pass uninitialized values here. Therefore, in
- * any context in which a user_desc comes from a 32-bit program,
- * the kernel must act as though lm == 0, regardless of the
- * actual value.
- */
- unsigned int lm:1;
- #endif
- };
- #define MODIFY_LDT_CONTENTS_DATA 0
- #define MODIFY_LDT_CONTENTS_STACK 1
- #define MODIFY_LDT_CONTENTS_CODE 2
- #endif /* !__ASSEMBLY__ */
- #endif /* _ASM_X86_LDT_H */
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