74ba9207e1
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 441 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc) Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520071858.739733335@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
117 lines
2.4 KiB
C
117 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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NetWinder Floating Point Emulator
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(c) Rebel.COM, 1998,1999
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(c) Philip Blundell, 2001
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Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
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*/
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#include "fpa11.h"
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#include "fpopcode.h"
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#include "fpmodule.h"
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#include "fpmodule.inl"
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#include <linux/compiler.h>
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#include <linux/string.h>
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/* Reset the FPA11 chip. Called to initialize and reset the emulator. */
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static void resetFPA11(void)
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{
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int i;
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FPA11 *fpa11 = GET_FPA11();
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/* initialize the register type array */
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for (i = 0; i <= 7; i++) {
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fpa11->fType[i] = typeNone;
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}
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/* FPSR: set system id to FP_EMULATOR, set AC, clear all other bits */
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fpa11->fpsr = FP_EMULATOR | BIT_AC;
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}
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int8 SetRoundingMode(const unsigned int opcode)
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{
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switch (opcode & MASK_ROUNDING_MODE) {
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default:
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case ROUND_TO_NEAREST:
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return float_round_nearest_even;
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case ROUND_TO_PLUS_INFINITY:
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return float_round_up;
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case ROUND_TO_MINUS_INFINITY:
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return float_round_down;
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case ROUND_TO_ZERO:
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return float_round_to_zero;
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}
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}
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int8 SetRoundingPrecision(const unsigned int opcode)
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{
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#ifdef CONFIG_FPE_NWFPE_XP
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switch (opcode & MASK_ROUNDING_PRECISION) {
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case ROUND_SINGLE:
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return 32;
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case ROUND_DOUBLE:
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return 64;
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case ROUND_EXTENDED:
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return 80;
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default:
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return 80;
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}
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#endif
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return 80;
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}
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void nwfpe_init_fpa(union fp_state *fp)
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{
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FPA11 *fpa11 = (FPA11 *)fp;
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#ifdef NWFPE_DEBUG
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printk("NWFPE: setting up state.\n");
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#endif
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memset(fpa11, 0, sizeof(FPA11));
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resetFPA11();
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fpa11->initflag = 1;
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}
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/* Emulate the instruction in the opcode. */
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unsigned int EmulateAll(unsigned int opcode)
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{
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unsigned int code;
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#ifdef NWFPE_DEBUG
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printk("NWFPE: emulating opcode %08x\n", opcode);
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#endif
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code = opcode & 0x00000f00;
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if (code == 0x00000100 || code == 0x00000200) {
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/* For coprocessor 1 or 2 (FPA11) */
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code = opcode & 0x0e000000;
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if (code == 0x0e000000) {
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if (opcode & 0x00000010) {
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/* Emulate conversion opcodes. */
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/* Emulate register transfer opcodes. */
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/* Emulate comparison opcodes. */
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return EmulateCPRT(opcode);
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} else {
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/* Emulate monadic arithmetic opcodes. */
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/* Emulate dyadic arithmetic opcodes. */
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return EmulateCPDO(opcode);
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}
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} else if (code == 0x0c000000) {
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/* Emulate load/store opcodes. */
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/* Emulate load/store multiple opcodes. */
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return EmulateCPDT(opcode);
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}
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}
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/* Invalid instruction detected. Return FALSE. */
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return 0;
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}
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