1 files changed, 31 insertions, 0 deletions

diff --git a/vm/mmap.h b/vm/mmap.h
new file mode 100644
index 0000000..bee364e
--- /dev/null
+++ b/vm/mmap.h
@@ -0,0 +1,31 @@
+#ifndef VM_MMAP_H
+#define VM_MMAP_H
+
+#include <debug.h>
+#include "filesys/off_t.h"
+#include "lib/user/syscall.h"
+
+/* we use the same structure as fd_table thus the capacity is fixed to
+   1024 (PGSIZE/4) */
+struct mmap_table
+{
+  struct mmap_table_entry **ids;
+  int id_free;    /* lowest-index free */
+  int id_max;     /* highest-index used */
+  int id_cap;     /* mmap table capacity */
+};
+
+/* a single entry in the mmap table */
+struct mmap_table_entry
+{
+  void *addr;
+  struct file *file;
+};
+
+bool mmap_table_init (struct mmap_table *table);
+void mmap_table_free (struct mmap_table *table);
+mapid_t mmap_table_insert (struct mmap_table *table, void *addr,
+    struct file *file, off_t len);
+bool mmap_table_remove (struct mmap_table *table, mapid_t mapping);
+
+#endif