mmapped_ipr.cc revision 11793
1/* 2 * Copyright (c) 2013 Andreas Sandberg 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer; 9 * redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution; 12 * neither the name of the copyright holders nor the names of its 13 * contributors may be used to endorse or promote products derived from 14 * this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * Authors: Andreas Sandberg 29 */ 30 31#include "arch/generic/mmapped_ipr.hh" 32 33#include "mem/packet.hh" 34#include "mem/packet_access.hh" 35#include "sim/pseudo_inst.hh" 36 37using namespace GenericISA; 38 39static void 40handlePseudoInst(ThreadContext *xc, Packet *pkt) 41{ 42 const Addr offset(pkt->getAddr() & IPR_IN_CLASS_MASK); 43 const uint8_t func((offset >> 8) & 0xFF); 44 const uint8_t subfunc(offset & 0xFF); 45 uint64_t ret; 46 47 assert((offset >> 16) == 0); 48 ret = PseudoInst::pseudoInst(xc, func, subfunc); 49 if (pkt->isRead()) 50 pkt->set(ret); 51} 52 53Cycles 54GenericISA::handleGenericIprRead(ThreadContext *xc, Packet *pkt) 55{ 56 Addr va(pkt->getAddr()); 57 Addr cls(va >> IPR_CLASS_SHIFT); 58 59 switch (cls) { 60 case IPR_CLASS_PSEUDO_INST: 61 handlePseudoInst(xc, pkt); 62 break; 63 default: 64 panic("Unhandled generic IPR read: 0x%x\n", va); 65 } 66 67 return Cycles(1); 68} 69 70Cycles 71GenericISA::handleGenericIprWrite(ThreadContext *xc, Packet *pkt) 72{ 73 Addr va(pkt->getAddr()); 74 Addr cls(va >> IPR_CLASS_SHIFT); 75 76 switch (cls) { 77 case IPR_CLASS_PSEUDO_INST: 78 handlePseudoInst(xc, pkt); 79 break; 80 default: 81 panic("Unhandled generic IPR write: 0x%x\n", va); 82 } 83 84 return Cycles(1); 85} 86