xnu-1699.32.7.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 03e6882ac35f2cb20d11fd6fc928576305784fd0..8285cb4df71f9f2341bcf0dafa10b9ebd8800472 100644 (file)
--- a/osfmk/i386/user_ldt.h
+++ b/osfmk/i386/user_ldt.h
@@ -1,16 +1,19 @@
 /*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2008 Apple Inc. All rights reserved.
  *
- * @APPLE_LICENSE_HEADER_START@
- * 
- * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
  * This file contains Original Code and/or Modifications of Original Code
  * as defined in and that are subject to the Apple Public Source License
  * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ * 
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
  * 
  * The Original Code and all software distributed under the License are
  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
@@ -20,7 +23,7 @@
  * Please see the License for the specific language governing rights and
  * limitations under the License.
  * 
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 /*
  * @OSF_COPYRIGHT@
@@ -60,29 +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      ldt);
+                       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_ */