1 /**************************************************************************
3 * Copyright (c) 2006-2007 Tungsten Graphics, Inc., Cedar Park, TX., USA
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
26 **************************************************************************/
28 * Authors: Thomas Hellström <thomas-at-tungstengraphics-dot-com>
31 #include <linux/export.h>
34 #include <machine/md_var.h>
35 #include <machine/cpufunc.h>
37 #define cpu_has_clflush 1
40 drm_clflush_virt_range(void *in_addr
, unsigned long length
)
43 if (cpu_has_clflush
) {
44 char *end
= addr
+ length
;
46 for (; addr
< end
; addr
+= cpu_clflush_line_size
)
47 clflush((unsigned long)addr
);
48 clflush((unsigned long)(end
- 1));
53 cpu_wbinvd_on_all_cpus();
55 EXPORT_SYMBOL(drm_clflush_virt_range
);