summaryrefslogtreecommitdiffstats
path: root/kernel/arch/mips/math-emu/dp_2008class.c
diff options
context:
space:
mode:
authorJosé Pekkarinen <jose.pekkarinen@nokia.com>2016-04-11 10:41:07 +0300
committerJosé Pekkarinen <jose.pekkarinen@nokia.com>2016-04-13 08:17:18 +0300
commite09b41010ba33a20a87472ee821fa407a5b8da36 (patch)
treed10dc367189862e7ca5c592f033dc3726e1df4e3 /kernel/arch/mips/math-emu/dp_2008class.c
parentf93b97fd65072de626c074dbe099a1fff05ce060 (diff)
These changes are the raw update to linux-4.4.6-rt14. Kernel sources
are taken from kernel.org, and rt patch from the rt wiki download page. During the rebasing, the following patch collided: Force tick interrupt and get rid of softirq magic(I70131fb85). Collisions have been removed because its logic was found on the source already. Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769 Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'kernel/arch/mips/math-emu/dp_2008class.c')
-rw-r--r--kernel/arch/mips/math-emu/dp_2008class.c55
1 files changed, 55 insertions, 0 deletions
diff --git a/kernel/arch/mips/math-emu/dp_2008class.c b/kernel/arch/mips/math-emu/dp_2008class.c
new file mode 100644
index 000000000..9dc39fc48
--- /dev/null
+++ b/kernel/arch/mips/math-emu/dp_2008class.c
@@ -0,0 +1,55 @@
+/*
+ * IEEE754 floating point arithmetic
+ * double precision: CLASS.f
+ * FPR[fd] = class(FPR[fs])
+ *
+ * MIPS floating point support
+ * Copyright (C) 2015 Imagination Technologies, Ltd.
+ * Author: Markos Chandras <markos.chandras@imgtec.com>
+ *
+ * This program is free software; you can distribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; version 2 of the License.
+ */
+
+#include "ieee754dp.h"
+
+int ieee754dp_2008class(union ieee754dp x)
+{
+ COMPXDP;
+
+ EXPLODEXDP;
+
+ /*
+ * 10 bit mask as follows:
+ *
+ * bit0 = SNAN
+ * bit1 = QNAN
+ * bit2 = -INF
+ * bit3 = -NORM
+ * bit4 = -DNORM
+ * bit5 = -ZERO
+ * bit6 = INF
+ * bit7 = NORM
+ * bit8 = DNORM
+ * bit9 = ZERO
+ */
+
+ switch(xc) {
+ case IEEE754_CLASS_SNAN:
+ return 0x01;
+ case IEEE754_CLASS_QNAN:
+ return 0x02;
+ case IEEE754_CLASS_INF:
+ return 0x04 << (xs ? 0 : 4);
+ case IEEE754_CLASS_NORM:
+ return 0x08 << (xs ? 0 : 4);
+ case IEEE754_CLASS_DNORM:
+ return 0x10 << (xs ? 0 : 4);
+ case IEEE754_CLASS_ZERO:
+ return 0x20 << (xs ? 0 : 4);
+ default:
+ pr_err("Unknown class: %d\n", xc);
+ return 0;
+ }
+}