Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / arm / nwfpe / double_cpdo.c

diff --git a/kernel/arch/arm/nwfpe/double_cpdo.c b/kernel/arch/arm/nwfpe/double_cpdo.c
new file mode 100644 (file)
index 0000000..c51d138
--- /dev/null
+++ b/kernel/arch/arm/nwfpe/double_cpdo.c
@@ -0,0 +1,167 @@
+/*
+    NetWinder Floating Point Emulator
+    (c) Rebel.COM, 1998,1999
+
+    Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "fpa11.h"
+#include "softfloat.h"
+#include "fpopcode.h"
+
+union float64_components {
+       float64 f64;
+       unsigned int i[2];
+};
+
+float64 float64_exp(float64 Fm);
+float64 float64_ln(float64 Fm);
+float64 float64_sin(float64 rFm);
+float64 float64_cos(float64 rFm);
+float64 float64_arcsin(float64 rFm);
+float64 float64_arctan(float64 rFm);
+float64 float64_log(float64 rFm);
+float64 float64_tan(float64 rFm);
+float64 float64_arccos(float64 rFm);
+float64 float64_pow(float64 rFn, float64 rFm);
+float64 float64_pol(float64 rFn, float64 rFm);
+
+static float64 float64_rsf(struct roundingData *roundData, float64 rFn, float64 rFm)
+{
+       return float64_sub(roundData, rFm, rFn);
+}
+
+static float64 float64_rdv(struct roundingData *roundData, float64 rFn, float64 rFm)
+{
+       return float64_div(roundData, rFm, rFn);
+}
+
+static float64 (*const dyadic_double[16])(struct roundingData*, float64 rFn, float64 rFm) = {
+       [ADF_CODE >> 20] = float64_add,
+       [MUF_CODE >> 20] = float64_mul,
+       [SUF_CODE >> 20] = float64_sub,
+       [RSF_CODE >> 20] = float64_rsf,
+       [DVF_CODE >> 20] = float64_div,
+       [RDF_CODE >> 20] = float64_rdv,
+       [RMF_CODE >> 20] = float64_rem,
+
+       /* strictly, these opcodes should not be implemented */
+       [FML_CODE >> 20] = float64_mul,
+       [FDV_CODE >> 20] = float64_div,
+       [FRD_CODE >> 20] = float64_rdv,
+};
+
+static float64 float64_mvf(struct roundingData *roundData,float64 rFm)
+{
+       return rFm;
+}
+
+static float64 float64_mnf(struct roundingData *roundData,float64 rFm)
+{
+       union float64_components u;
+
+       u.f64 = rFm;
+#ifdef __ARMEB__
+       u.i[0] ^= 0x80000000;
+#else
+       u.i[1] ^= 0x80000000;
+#endif
+
+       return u.f64;
+}
+
+static float64 float64_abs(struct roundingData *roundData,float64 rFm)
+{
+       union float64_components u;
+
+       u.f64 = rFm;
+#ifdef __ARMEB__
+       u.i[0] &= 0x7fffffff;
+#else
+       u.i[1] &= 0x7fffffff;
+#endif
+
+       return u.f64;
+}
+
+static float64 (*const monadic_double[16])(struct roundingData *, float64 rFm) = {
+       [MVF_CODE >> 20] = float64_mvf,
+       [MNF_CODE >> 20] = float64_mnf,
+       [ABS_CODE >> 20] = float64_abs,
+       [RND_CODE >> 20] = float64_round_to_int,
+       [URD_CODE >> 20] = float64_round_to_int,
+       [SQT_CODE >> 20] = float64_sqrt,
+       [NRM_CODE >> 20] = float64_mvf,
+};
+
+unsigned int DoubleCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd)
+{
+       FPA11 *fpa11 = GET_FPA11();
+       float64 rFm;
+       unsigned int Fm, opc_mask_shift;
+
+       Fm = getFm(opcode);
+       if (CONSTANT_FM(opcode)) {
+               rFm = getDoubleConstant(Fm);
+       } else {
+               switch (fpa11->fType[Fm]) {
+               case typeSingle:
+                       rFm = float32_to_float64(fpa11->fpreg[Fm].fSingle);
+                       break;
+
+               case typeDouble:
+                       rFm = fpa11->fpreg[Fm].fDouble;
+                       break;
+
+               default:
+                       return 0;
+               }
+       }
+
+       opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20;
+       if (!MONADIC_INSTRUCTION(opcode)) {
+               unsigned int Fn = getFn(opcode);
+               float64 rFn;
+
+               switch (fpa11->fType[Fn]) {
+               case typeSingle:
+                       rFn = float32_to_float64(fpa11->fpreg[Fn].fSingle);
+                       break;
+
+               case typeDouble:
+                       rFn = fpa11->fpreg[Fn].fDouble;
+                       break;
+
+               default:
+                       return 0;
+               }
+
+               if (dyadic_double[opc_mask_shift]) {
+                       rFd->fDouble = dyadic_double[opc_mask_shift](roundData, rFn, rFm);
+               } else {
+                       return 0;
+               }
+       } else {
+               if (monadic_double[opc_mask_shift]) {
+                       rFd->fDouble = monadic_double[opc_mask_shift](roundData, rFm);
+               } else {
+                       return 0;
+               }
+       }
+
+       return 1;
+}