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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/include/drm/drm_fixed.h
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/include/drm/drm_fixed.h')
-rw-r--r--kernel/include/drm/drm_fixed.h162
1 files changed, 162 insertions, 0 deletions
diff --git a/kernel/include/drm/drm_fixed.h b/kernel/include/drm/drm_fixed.h
new file mode 100644
index 000000000..d639049a6
--- /dev/null
+++ b/kernel/include/drm/drm_fixed.h
@@ -0,0 +1,162 @@
+/*
+ * Copyright 2009 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Dave Airlie
+ * Christian König
+ */
+#ifndef DRM_FIXED_H
+#define DRM_FIXED_H
+
+#include <linux/math64.h>
+
+typedef union dfixed {
+ u32 full;
+} fixed20_12;
+
+
+#define dfixed_const(A) (u32)(((A) << 12))/* + ((B + 0.000122)*4096)) */
+#define dfixed_const_half(A) (u32)(((A) << 12) + 2048)
+#define dfixed_const_666(A) (u32)(((A) << 12) + 2731)
+#define dfixed_const_8(A) (u32)(((A) << 12) + 3277)
+#define dfixed_mul(A, B) ((u64)((u64)(A).full * (B).full + 2048) >> 12)
+#define dfixed_init(A) { .full = dfixed_const((A)) }
+#define dfixed_init_half(A) { .full = dfixed_const_half((A)) }
+#define dfixed_trunc(A) ((A).full >> 12)
+#define dfixed_frac(A) ((A).full & ((1 << 12) - 1))
+
+static inline u32 dfixed_floor(fixed20_12 A)
+{
+ u32 non_frac = dfixed_trunc(A);
+
+ return dfixed_const(non_frac);
+}
+
+static inline u32 dfixed_ceil(fixed20_12 A)
+{
+ u32 non_frac = dfixed_trunc(A);
+
+ if (A.full > dfixed_const(non_frac))
+ return dfixed_const(non_frac + 1);
+ else
+ return dfixed_const(non_frac);
+}
+
+static inline u32 dfixed_div(fixed20_12 A, fixed20_12 B)
+{
+ u64 tmp = ((u64)A.full << 13);
+
+ do_div(tmp, B.full);
+ tmp += 1;
+ tmp /= 2;
+ return lower_32_bits(tmp);
+}
+
+#define DRM_FIXED_POINT 32
+#define DRM_FIXED_ONE (1ULL << DRM_FIXED_POINT)
+#define DRM_FIXED_DECIMAL_MASK (DRM_FIXED_ONE - 1)
+#define DRM_FIXED_DIGITS_MASK (~DRM_FIXED_DECIMAL_MASK)
+
+static inline s64 drm_int2fixp(int a)
+{
+ return ((s64)a) << DRM_FIXED_POINT;
+}
+
+static inline int drm_fixp2int(int64_t a)
+{
+ return ((s64)a) >> DRM_FIXED_POINT;
+}
+
+static inline unsigned drm_fixp_msbset(int64_t a)
+{
+ unsigned shift, sign = (a >> 63) & 1;
+
+ for (shift = 62; shift > 0; --shift)
+ if (((a >> shift) & 1) != sign)
+ return shift;
+
+ return 0;
+}
+
+static inline s64 drm_fixp_mul(s64 a, s64 b)
+{
+ unsigned shift = drm_fixp_msbset(a) + drm_fixp_msbset(b);
+ s64 result;
+
+ if (shift > 61) {
+ shift = shift - 61;
+ a >>= (shift >> 1) + (shift & 1);
+ b >>= shift >> 1;
+ } else
+ shift = 0;
+
+ result = a * b;
+
+ if (shift > DRM_FIXED_POINT)
+ return result << (shift - DRM_FIXED_POINT);
+
+ if (shift < DRM_FIXED_POINT)
+ return result >> (DRM_FIXED_POINT - shift);
+
+ return result;
+}
+
+static inline s64 drm_fixp_div(s64 a, s64 b)
+{
+ unsigned shift = 62 - drm_fixp_msbset(a);
+ s64 result;
+
+ a <<= shift;
+
+ if (shift < DRM_FIXED_POINT)
+ b >>= (DRM_FIXED_POINT - shift);
+
+ result = div64_s64(a, b);
+
+ if (shift > DRM_FIXED_POINT)
+ return result >> (shift - DRM_FIXED_POINT);
+
+ return result;
+}
+
+static inline s64 drm_fixp_exp(s64 x)
+{
+ s64 tolerance = div64_s64(DRM_FIXED_ONE, 1000000);
+ s64 sum = DRM_FIXED_ONE, term, y = x;
+ u64 count = 1;
+
+ if (x < 0)
+ y = -1 * x;
+
+ term = y;
+
+ while (term >= tolerance) {
+ sum = sum + term;
+ count = count + 1;
+ term = drm_fixp_mul(term, div64_s64(y, count));
+ }
+
+ if (x < 0)
+ sum = drm_fixp_div(DRM_FIXED_ONE, sum);
+
+ return sum;
+}
+
+#endif