xnu-4903.221.2.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 4295d939efce46ac0367356c6cc817ffb79a880d..8285cb4df71f9f2341bcf0dafa10b9ebd8800472 100644 (file)
--- a/osfmk/i386/user_ldt.h
+++ b/osfmk/i386/user_ldt.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2008 Apple Inc. All rights reserved.
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
@@ -63,29 +63,36 @@
 /*
  * User LDT management.
  *
- * Each thread in a task may have its own LDT.
+ * Each task may have its own LDT.
  */
 
+#define        LDT_AUTO_ALLOC  0xffffffff
+
+#ifdef KERNEL
 #include <i386/seg.h>
 
 struct user_ldt {
-       struct real_descriptor  desc;   /* descriptor for self */
-       struct real_descriptor  ldt[1]; /* descriptor table (variable) */
+       unsigned int start;             /* first descriptor in table */
+       unsigned int count;             /* how many descriptors in table */
+       struct real_descriptor  ldt[0]; /* descriptor table (variable) */
 };
 typedef struct user_ldt *      user_ldt_t;
 
-/*
- * 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 user_ldt_t      user_ldt_copy(
+                       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_ */