MFhead @ r292474

1 files changed, 51 insertions, 0 deletions

diff --git a/sys/riscv/include/sf_buf.h b/sys/riscv/include/sf_buf.h
new file mode 100644
index 0000000..59f9009
--- /dev/null
+++ b/sys/riscv/include/sf_buf.h
@@ -0,0 +1,51 @@
+/*-
+ * Copyright (c) 2003, 2005 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_
+
+/*
+ * On this machine, the only purpose for which sf_buf is used is to implement
+ * an opaque pointer required by the machine-independent parts of the kernel.
+ * That pointer references the vm_page that is "mapped" by the sf_buf.  The
+ * actual mapping is provided by the direct virtual-to-physical mapping.  
+ */
+static inline vm_offset_t
+sf_buf_kva(struct sf_buf *sf)
+{
+
+	return (PHYS_TO_DMAP(VM_PAGE_TO_PHYS((vm_page_t)sf)));
+}
+
+static inline vm_page_t
+sf_buf_page(struct sf_buf *sf)
+{
+
+	return ((vm_page_t)sf);
+}
+#endif /* !_MACHINE_SF_BUF_H_ */