Libc-391.5.22.tar.gz

[apple/libc.git] / mach / mach_init.c

diff --git a/mach/mach_init.c b/mach/mach_init.c
index 8bb2f538de6504e7e8f22cd30ab3b396fc23c066..8ac6241c1098b2d5bfa3500d805cb1b86c420749 100644 (file)
--- a/mach/mach_init.c
+++ b/mach/mach_init.c
@@ -3,19 +3,20 @@
  *
  * @APPLE_LICENSE_HEADER_START@
  * 
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License").  You may not use this file except in compliance with the
- * License.  Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * 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.
  * 
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
  * 
  * @APPLE_LICENSE_HEADER_END@
  */
@@ -59,6 +60,8 @@ mach_port_t     mach_host_self_ = MACH_PORT_NULL;
 __private_extern__ kern_return_t _host_mach_msg_trap_return_;
 
 vm_size_t      vm_page_size;
+vm_size_t      vm_page_mask;
+int            vm_page_shift;
 
 /*
  * Forward internal declarations for automatic mach_init during
@@ -70,9 +73,11 @@ void (*_atfork_child_routine)(void);
 static void mach_atfork_child_routine(void);
 static boolean_t first = TRUE;
 static void (*previous_atfork_child_routine)(void);
+static boolean_t mach_init_inited = FALSE;
 extern int mach_init(void);
 extern void _pthread_set_self(void *);
 extern void cthread_set_self(void *);
+extern void other_libc_init(void);
 
 
 static void mach_atfork_child_routine(void)
@@ -89,6 +94,7 @@ static void mach_atfork_child_routine(void)
        if (previous_atfork_child_routine) {
                (*previous_atfork_child_routine)();
        }
+       mach_init_inited = FALSE;
        mach_init();
 }
 
@@ -100,7 +106,6 @@ mach_host_self()
 
 int mach_init_doit(int forkchild)
 {
-       mach_msg_type_number_t host_info_size;
        host_t host;
 
        /*
@@ -137,15 +142,25 @@ int mach_init_doit(int forkchild)
         *      Cache some other valuable system constants
         */
 
-#ifdef HOST_MACH_MSG_TRAP      
-       host_info_size = 0;
-        _host_mach_msg_trap_return_ = host_info(host,
-                                           HOST_MACH_MSG_TRAP,
-                                           0,
-                                           &host_info_size);
-#endif
-
+#if defined(__ppc64__) /* NGK hack for now */
+       vm_page_size = 4096;
+#else
        (void)host_page_size(host, &vm_page_size);
+#endif
+       vm_page_mask = vm_page_size - 1;
+       if (vm_page_size == 0) {
+               /* guard against unlikely craziness */
+               vm_page_shift = 0;
+       } else {
+               /*
+                * Unfortunately there's no kernel interface to get the
+                * vm_page_shift, but it's easy enough to calculate.
+                */
+               for (vm_page_shift = 0;
+                    (vm_page_size & (1 << vm_page_shift)) == 0;
+                    vm_page_shift++)
+                       continue;
+       }
 
        mach_port_deallocate(mach_task_self_, host);
 
@@ -197,12 +212,35 @@ int mach_init_doit(int forkchild)
                             VM_PROT_NONE, VM_PROT_NONE, VM_INHERIT_COPY);
                /* ignore result, we don't care if it failed */
        }
+
        return(0);
 }
 
+#ifdef __DYNAMIC__
+/* libc_initializer is the dyld initializer for libc (3760827) */
+static void libc_initializer() __attribute__((constructor));
+static void
+libc_initializer()
+{
+       mach_init();
+}
+#endif /* __DYNAMIC__ */
+
+/* mach_init may get called from the initializer and from crt.c, but only
+ * call mach_init_doit() once */
 int mach_init(void)
 {
-        return(mach_init_doit(0));
+       int ret;
+
+       if (mach_init_inited)
+               return(0);
+       mach_init_inited = TRUE;
+       ret = mach_init_doit(0);
+
+       /* Do other Libc initialization */
+       other_libc_init();
+
+       return ret;
 }
 
 int    (*mach_init_routine)(void) = mach_init;