1 files changed, 116 insertions, 0 deletions
diff --git a/arch/arm/nwfpe/fpa11.c b/arch/arm/nwfpe/fpa11.c
new file mode 100644
index 000000000..2379e2cc7
--- /dev/null
+++ b/arch/arm/nwfpe/fpa11.c
@@ -0,0 +1,116 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+    NetWinder Floating Point Emulator
+    (c) Rebel.COM, 1998,1999
+    (c) Philip Blundell, 2001
+
+    Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
+
+*/
+
+#include "fpa11.h"
+#include "fpopcode.h"
+
+#include "fpmodule.h"
+#include "fpmodule.inl"
+
+#include <linux/compiler.h>
+#include <linux/string.h>
+
+/* 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;
+}
+
+int8 SetRoundingMode(const unsigned int opcode)
+{
+	switch (opcode & MASK_ROUNDING_MODE) {
+	default:
+	case ROUND_TO_NEAREST:
+		return float_round_nearest_even;
+
+	case ROUND_TO_PLUS_INFINITY:
+		return float_round_up;
+
+	case ROUND_TO_MINUS_INFINITY:
+		return float_round_down;
+
+	case ROUND_TO_ZERO:
+		return float_round_to_zero;
+	}
+}
+
+int8 SetRoundingPrecision(const unsigned int opcode)
+{
+#ifdef CONFIG_FPE_NWFPE_XP
+	switch (opcode & MASK_ROUNDING_PRECISION) {
+	case ROUND_SINGLE:
+		return 32;
+
+	case ROUND_DOUBLE:
+		return 64;
+
+	case ROUND_EXTENDED:
+		return 80;
+
+	default:
+		return 80;
+	}
+#endif
+	return 80;
+}
+
+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();
+	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;
+}