- Modify alpha's sf_buf implementation to use the direct virtual-to-

   physical mapping.
 - Move the sf_buf API to its own header file; make struct sf_buf's
   definition machine dependent.  In this commit, we remove an
   unnecessary field from struct sf_buf on the alpha, amd64, and ia64.
   Ultimately, we may eliminate struct sf_buf on those architecures
   except as an opaque pointer that references a vm page.

1 files changed, 56 insertions, 0 deletions

diff --git a/sys/i386/include/sf_buf.h b/sys/i386/include/sf_buf.h
new file mode 100644
index 0000000..b6ee1cc
--- /dev/null
+++ b/sys/i386/include/sf_buf.h
@@ -0,0 +1,56 @@
+/*-
+ * Copyright (c) 2003 Alan L. Cox <alc@cs.rice.edu>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _MACHINE_SF_BUF_H_
+#define _MACHINE_SF_BUF_H_
+
+#include <sys/queue.h>
+
+struct vm_page;
+
+struct sf_buf {
+	SLIST_ENTRY(sf_buf) free_list;	/* list of free buffer slots */
+	struct		vm_page *m;	/* currently mapped page */
+	vm_offset_t	kva;		/* va of mapping */
+};
+
+static __inline vm_offset_t
+sf_buf_kva(struct sf_buf *sf)
+{
+
+	return (sf->kva);
+}
+
+static __inline struct vm_page *
+sf_buf_page(struct sf_buf *sf)
+{
+
+	return (sf->m);
+}
+
+#endif /* !_MACHINE_SF_BUF_H_ */