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authoralc <alc@FreeBSD.org>2009-06-26 04:47:43 +0000
committeralc <alc@FreeBSD.org>2009-06-26 04:47:43 +0000
commit91cafd48b17a27bda3cfbc38e8460a14c273ba9a (patch)
treebe473333ccc371c232599396e7b5253cdbad245b /sys/amd64
parent9a472dd5889ffcc7520ed12bf9cbc791eb34eab7 (diff)
downloadFreeBSD-src-91cafd48b17a27bda3cfbc38e8460a14c273ba9a.zip
FreeBSD-src-91cafd48b17a27bda3cfbc38e8460a14c273ba9a.tar.gz
This change is the next step in implementing the cache control functionality
required by video card drivers. Specifically, this change introduces vm_cache_mode_t with an appropriate VM_CACHE_DEFAULT definition on all architectures. In addition, this changes adds a vm_cache_mode_t parameter to kmem_alloc_contig() and vm_phys_alloc_contig(). These will be the interfaces for allocating mapped kernel memory and physical memory, respectively, with non-default cache modes. In collaboration with: jhb
Diffstat (limited to 'sys/amd64')
-rw-r--r--sys/amd64/include/vm.h45
1 files changed, 45 insertions, 0 deletions
diff --git a/sys/amd64/include/vm.h b/sys/amd64/include/vm.h
new file mode 100644
index 0000000..411e271
--- /dev/null
+++ b/sys/amd64/include/vm.h
@@ -0,0 +1,45 @@
+/*-
+ * Copyright (c) 2009 Advanced Computing Technologies LLC
+ * Written by: John H. Baldwin <jhb@FreeBSD.org>
+ * 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_VM_H_
+#define _MACHINE_VM_H_
+
+#include <machine/specialreg.h>
+
+/* Cache control options. */
+#define VM_CACHE_UNCACHEABLE ((vm_cache_mode_t)PAT_UNCACHEABLE)
+#define VM_CACHE_WRITE_COMBINING ((vm_cache_mode_t)PAT_WRITE_COMBINING)
+#define VM_CACHE_WRITE_THROUGH ((vm_cache_mode_t)PAT_WRITE_THROUGH)
+#define VM_CACHE_WRITE_PROTECTED ((vm_cache_mode_t)PAT_WRITE_PROTECTED)
+#define VM_CACHE_WRITE_BACK ((vm_cache_mode_t)PAT_WRITE_BACK)
+#define VM_CACHE_UNCACHED ((vm_cache_mode_t)PAT_UNCACHED)
+
+#define VM_CACHE_DEFAULT VM_CACHE_WRITE_BACK
+
+#endif /* !_MACHINE_PMAP_H_ */
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