1 files changed, 40 insertions, 0 deletions

diff --git a/arch/x86/include/asm/ldt.h b/arch/x86/include/asm/ldt.h
new file mode 100644
index 00000000000..a5228504d86
--- /dev/null
+++ b/arch/x86/include/asm/ldt.h
@@ -0,0 +1,40 @@
+/*
+ * 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__
+        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 */