1 files changed, 80 insertions, 0 deletions
diff --git a/libhurd-mm/anonymous.c b/libhurd-mm/anonymous.c
new file mode 100644
index 0000000..62a831e
--- /dev/null
+++ b/libhurd-mm/anonymous.c
@@ -0,0 +1,80 @@
+/* anonymous.c - Anonymous memory management.
+   Copyright (C) 2004, 2005 Free Software Foundation, Inc.
+   Written by Neal H. Walfield <neal@gnu.org>.
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd 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.
+   
+   The GNU Hurd 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 the GNU Hurd; see the file COPYING.  If not, write to
+   the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
+   USA.  */
+
+#if HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdint.h>
+#include "priv.h"
+
+static struct hurd_store anonymous_store;
+
+error_t
+hurd_anonymous_allocate (uintptr_t *address, size_t size,
+			 uintptr_t flags, int map_now)
+{
+  /* This is a bit frustrating.  The store cache is indexed by the
+     store offset thus even though anonymous memory does not initially
+     have a location on backing store, we need to fabricate one.
+     Right now we just use a static variable.  The 64-bits should give
+     us a fair amount of time before we need to come up with a better
+     solution.  */
+  static off64_t offset;
+  error_t err;
+
+  err = hurd_store_bind_to_vm (&anonymous_store, offset,
+			       address ? *address : 0, size,
+			       flags, 1, address);
+  if (err)
+    return err;
+
+  offset += size;
+  return 0;
+}
+
+static void
+handle_fault (hurd_store_t *store, void *hook, l4_thread_id_t thread,
+	      struct region vm_region, off64_t store_offset,
+	      uintptr_t addr, l4_word_t access)
+{
+  /* XXX: Until we have a real swap server we (correctly) assume that
+     if there is no memory then memory has just not yet been allocated
+     (i.e. it is not just paged out).  */
+  struct hurd_memory *memory = hurd_memory_alloc (vm_region.size);
+  if (! memory)
+    panic ("hurd_memory_alloc failed.");
+
+  store_offset -= addr - vm_region.start;
+
+  hurd_store_cache (store, store_offset, memory);
+}
+
+void
+hurd_anonymous_system_init (void)
+{
+  static bool init_done;
+
+  assert (! init_done);
+  init_done = true;
+
+  hurd_store_init (&anonymous_store, NULL, handle_fault);
+}