a9scu.cc revision 9808
1/* 2 * Copyright (c) 2010 ARM Limited 3 * All rights reserved 4 * 5 * The license below extends only to copyright in the software and shall 6 * not be construed as granting a license to any other intellectual 7 * property including but not limited to intellectual property relating 8 * to a hardware implementation of the functionality of the software 9 * licensed hereunder. You may use the software subject to the license 10 * terms below provided that you ensure that this notice is replicated 11 * unmodified and in its entirety in all distributions of the software, 12 * modified or unmodified, in source code or in binary form. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions are 16 * met: redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer; 18 * redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution; 21 * neither the name of the copyright holders nor the names of its 22 * contributors may be used to endorse or promote products derived from 23 * this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 * 37 * Authors: Ali Saidi 38 */ 39 40#include "base/intmath.hh" 41#include "base/trace.hh" 42#include "dev/arm/a9scu.hh" 43#include "mem/packet.hh" 44#include "mem/packet_access.hh" 45#include "sim/system.hh" 46 47A9SCU::A9SCU(Params *p) 48 : BasicPioDevice(p, 0x60) 49{ 50} 51 52Tick 53A9SCU::read(PacketPtr pkt) 54{ 55 assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize); 56 assert(pkt->getSize() == 4); 57 Addr daddr = pkt->getAddr() - pioAddr; 58 pkt->allocate(); 59 60 switch(daddr) { 61 case Control: 62 pkt->set(1); // SCU already enabled 63 break; 64 case Config: 65 assert(sys->numContexts() <= 4); 66 int smp_bits, core_cnt; 67 smp_bits = power(2,sys->numContexts()) - 1; 68 core_cnt = sys->numContexts() - 1; 69 pkt->set(smp_bits << 4 | core_cnt); 70 break; 71 default: 72 // Only configuration register is implemented 73 panic("Tried to read SCU at offset %#x\n", daddr); 74 break; 75 } 76 pkt->makeAtomicResponse(); 77 return pioDelay; 78 79} 80 81Tick 82A9SCU::write(PacketPtr pkt) 83{ 84 assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize); 85 86 Addr daddr = pkt->getAddr() - pioAddr; 87 switch (daddr) { 88 default: 89 // Nothing implemented at this point 90 panic("Tried to write SCU at offset %#x\n", daddr); 91 break; 92 } 93 pkt->makeAtomicResponse(); 94 return pioDelay; 95} 96 97A9SCU * 98A9SCUParams::create() 99{ 100 return new A9SCU(this); 101} 102