xnu-792.24.17.tar.gz

[apple/xnu.git] / osfmk / i386 / user_ldt.h

diff --git a/osfmk/i386/user_ldt.h b/osfmk/i386/user_ldt.h
index e11cd3072dadf06055a51a363154f894e42ee52d..db0b78e4d73802e4e0cd721d321efa42bbeb43dc 100644 (file)
--- a/osfmk/i386/user_ldt.h
+++ b/osfmk/i386/user_ldt.h
@@ -57,36 +57,29 @@
 /*
  * User LDT management.
  *
 /*
  * User LDT management.
  *

- * Each task may have its own LDT.
+ * Each thread in a task may have its own LDT.

  */
 
  */
 

-#define        LDT_AUTO_ALLOC  0xffffffff
-
-#ifdef KERNEL

 #include <i386/seg.h>
 
 struct user_ldt {
 #include <i386/seg.h>
 
 struct user_ldt {

-       unsigned int start;             /* first descriptor in table */
-       unsigned int count;             /* how many descriptors in table */
-       struct real_descriptor  ldt[0]; /* descriptor table (variable) */
+       struct real_descriptor  desc;   /* descriptor for self */
+       struct real_descriptor  ldt[1]; /* descriptor table (variable) */

 };
 typedef struct user_ldt *      user_ldt_t;
 
 };
 typedef struct user_ldt *      user_ldt_t;
 

-extern user_ldt_t      user_ldt_copy(
-                       user_ldt_t      uldt);
+/*
+ * Check code/stack/data selector values against LDT if present.
+ */
+#define        S_CODE  0               /* code segment */
+#define        S_STACK 1               /* stack segment */
+#define        S_DATA  2               /* data segment */
+
+extern boolean_t selector_check(
+                       thread_t        thread,
+                       int             sel,
+                       int             type);

 extern void    user_ldt_free(
                        user_ldt_t      uldt);
 extern void    user_ldt_free(
                        user_ldt_t      uldt);

-extern void    user_ldt_set(
-                       thread_t        thread);
-#else /* !KERNEL */
-#include <sys/cdefs.h>
-
-union ldt_entry;
-
-__BEGIN_DECLS
-int i386_get_ldt(int, union ldt_entry *, int);
-int i386_set_ldt(int, const union ldt_entry *, int);
-__END_DECLS
-#endif /* KERNEL */

 
 #endif /* _I386_USER_LDT_H_ */
 
 #endif /* _I386_USER_LDT_H_ */