From 066cdad36709a3633b1c99f17059a2796a725633 Mon Sep 17 00:00:00 2001
From: "Michael I. Bushnell" <mib@gnu.org>
Date: Thu, 10 Feb 1994 19:32:14 +0000
Subject: Initial revision

---
 libdiskfs/=exc.c | 87 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 libdiskfs/=exc.c

(limited to 'libdiskfs')

diff --git a/libdiskfs/=exc.c b/libdiskfs/=exc.c
new file mode 100644
index 00000000..3e0380c6
--- /dev/null
+++ b/libdiskfs/=exc.c
@@ -0,0 +1,87 @@
+/* 
+   Copyright (C) 1994 Free Software Foundation
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+/* Mark the memory at ADDR continuing for LEN bytes as mapped from pager P
+   at offset OFF.  Call when vm_map-ing part of the disk. 
+   CAVEAT: addr must not be zero. */
+void
+register_memory_fault_area (struct pager *p,
+			    vm_address_t off,
+			    void *addr, 
+			    long len)
+{
+  int i;
+
+  assert (addr);
+
+  spin_lock (&memory_fault_lock);
+  
+  for (i = 0; i < EXC_TABLE_SIZE; i++)
+    if (!memory_fault_table[i].offset)
+      {
+	memory_fault_table[i].p = p;
+	memory_fault_table[i].pager_offset = off;
+	memory_fault_table[i].offset = addr;
+	memory_fault_table[i].length = len;
+	spin_unlock (&memory_fault_lock);
+	return;
+      }
+
+  assert (0);
+}
+
+/* Mark the memory at ADDR continuing for LEN bytes as no longer
+   mapped from the disk.  Call when vm_unmap-ing part of the disk.  */
+void
+unregister_memory_fault_area (void *addr,
+			      long len)
+{
+  int i;
+
+  assert (addr);
+
+  spin_lock (&memory_fault_lock);
+  for (i = 0; i < EXC_TABLE_SIZE; i++)
+    if (memory_fault_table[i].offset == addr
+	&& memory_fault_table[i].length == len)
+      {
+	memory_fault_table[i].offset = 0;
+	spin_unlock (&memory_fault_lock);
+	return;
+      }
+  assert (0);
+}
+
+/* Set up the exception handling system.  */
+void
+init_exceptions ()
+{
+  int i;
+
+  for (i = 0; i < EXC_TABLE_SIZE; i++)
+    memory_fault_table[i].offset = 0;
+  spin_lock_init (&memory_fault_lock);
+
+#if notdebugging
+  mach_port_allocate (mach_task_self (), MACH_PORT_RIGHT_RECEIVE, &excport);
+  mach_port_insert_right (mach_task_self (), excport, excport, 
+			  MACH_MSG_TYPE_MAKE_SEND);
+  task_get_special_port (mach_task_self (), TASK_EXCEPTION_PORT, &oldexcport);
+  task_set_special_port (mach_task_self (), TASK_EXCEPTION_PORT, excport);
+  mach_port_deallocate (mach_task_self (), excport);
+#endif
+}
-- 
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