1 files changed, 143 insertions, 0 deletions

diff --git a/arch/arm/nwfpe/fpa11.c b/arch/arm/nwfpe/fpa11.c
new file mode 100644
index 000000000000..bf61696865ec
--- /dev/null
+++ b/arch/arm/nwfpe/fpa11.c
@@ -0,0 +1,143 @@
+/*
+    NetWinder Floating Point Emulator
+    (c) Rebel.COM, 1998,1999
+    (c) Philip Blundell, 2001
+
+    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 "fpopcode.h"
+
+#include "fpmodule.h"
+#include "fpmodule.inl"
+
+#include <linux/config.h>
+#include <linux/compiler.h>
+#include <linux/string.h>
+#include <asm/system.h>
+
+/* forward declarations */
+unsigned int EmulateCPDO(const unsigned int);
+unsigned int EmulateCPDT(const unsigned int);
+unsigned int EmulateCPRT(const unsigned int);
+
+/* Reset the FPA11 chip.  Called to initialize and reset the emulator. */
+static void resetFPA11(void)
+{
+        int i;
+        FPA11 *fpa11 = GET_FPA11();
+
+        /* initialize the register type array */
+        for (i = 0; i <= 7; i++) {
+                fpa11->fType[i] = typeNone;
+        }
+
+        /* FPSR: set system id to FP_EMULATOR, set AC, clear all other bits */
+        fpa11->fpsr = FP_EMULATOR | BIT_AC;
+}
+
+void SetRoundingMode(const unsigned int opcode)
+{
+        switch (opcode & MASK_ROUNDING_MODE) {
+        default:
+        case ROUND_TO_NEAREST:
+                float_rounding_mode = float_round_nearest_even;
+                break;
+
+        case ROUND_TO_PLUS_INFINITY:
+                float_rounding_mode = float_round_up;
+                break;
+
+        case ROUND_TO_MINUS_INFINITY:
+                float_rounding_mode = float_round_down;
+                break;
+
+        case ROUND_TO_ZERO:
+                float_rounding_mode = float_round_to_zero;
+                break;
+        }
+}
+
+void SetRoundingPrecision(const unsigned int opcode)
+{
+#ifdef CONFIG_FPE_NWFPE_XP
+        switch (opcode & MASK_ROUNDING_PRECISION) {
+        case ROUND_SINGLE:
+                floatx80_rounding_precision = 32;
+                break;
+
+        case ROUND_DOUBLE:
+                floatx80_rounding_precision = 64;
+                break;
+
+        case ROUND_EXTENDED:
+                floatx80_rounding_precision = 80;
+                break;
+
+        default:
+                floatx80_rounding_precision = 80;
+        }
+#endif
+}
+
+void nwfpe_init_fpa(union fp_state *fp)
+{
+        FPA11 *fpa11 = (FPA11 *)fp;
+#ifdef NWFPE_DEBUG
+        printk("NWFPE: setting up state.\n");
+#endif
+        memset(fpa11, 0, sizeof(FPA11));
+        resetFPA11();
+        SetRoundingMode(ROUND_TO_NEAREST);
+        SetRoundingPrecision(ROUND_EXTENDED);
+        fpa11->initflag = 1;
+}
+
+/* Emulate the instruction in the opcode. */
+unsigned int EmulateAll(unsigned int opcode)
+{
+        unsigned int code;
+
+#ifdef NWFPE_DEBUG
+        printk("NWFPE: emulating opcode %08x\n", opcode);
+#endif
+        code = opcode & 0x00000f00;
+        if (code == 0x00000100 || code == 0x00000200) {
+                /* For coprocessor 1 or 2 (FPA11) */
+                code = opcode & 0x0e000000;
+                if (code == 0x0e000000) {
+                        if (opcode & 0x00000010) {
+                                /* Emulate conversion opcodes. */
+                                /* Emulate register transfer opcodes. */
+                                /* Emulate comparison opcodes. */
+                                return EmulateCPRT(opcode);
+                        } else {
+                                /* Emulate monadic arithmetic opcodes. */
+                                /* Emulate dyadic arithmetic opcodes. */
+                                return EmulateCPDO(opcode);
+                        }
+                } else if (code == 0x0c000000) {
+                        /* Emulate load/store opcodes. */
+                        /* Emulate load/store multiple opcodes. */
+                        return EmulateCPDT(opcode);
+                }
+        }
+
+        /* Invalid instruction detected.  Return FALSE. */
+        return 0;
+}