a9scu.cc revision 11793
18282SAli.Saidi@ARM.com/* 28282SAli.Saidi@ARM.com * Copyright (c) 2010 ARM Limited 38282SAli.Saidi@ARM.com * All rights reserved 48282SAli.Saidi@ARM.com * 58282SAli.Saidi@ARM.com * The license below extends only to copyright in the software and shall 68282SAli.Saidi@ARM.com * not be construed as granting a license to any other intellectual 78282SAli.Saidi@ARM.com * property including but not limited to intellectual property relating 88282SAli.Saidi@ARM.com * to a hardware implementation of the functionality of the software 98282SAli.Saidi@ARM.com * licensed hereunder. You may use the software subject to the license 108282SAli.Saidi@ARM.com * terms below provided that you ensure that this notice is replicated 118282SAli.Saidi@ARM.com * unmodified and in its entirety in all distributions of the software, 128282SAli.Saidi@ARM.com * modified or unmodified, in source code or in binary form. 138282SAli.Saidi@ARM.com * 148282SAli.Saidi@ARM.com * Redistribution and use in source and binary forms, with or without 158282SAli.Saidi@ARM.com * modification, are permitted provided that the following conditions are 168282SAli.Saidi@ARM.com * met: redistributions of source code must retain the above copyright 178282SAli.Saidi@ARM.com * notice, this list of conditions and the following disclaimer; 188282SAli.Saidi@ARM.com * redistributions in binary form must reproduce the above copyright 198282SAli.Saidi@ARM.com * notice, this list of conditions and the following disclaimer in the 208282SAli.Saidi@ARM.com * documentation and/or other materials provided with the distribution; 218282SAli.Saidi@ARM.com * neither the name of the copyright holders nor the names of its 228282SAli.Saidi@ARM.com * contributors may be used to endorse or promote products derived from 238282SAli.Saidi@ARM.com * this software without specific prior written permission. 248282SAli.Saidi@ARM.com * 258282SAli.Saidi@ARM.com * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 268282SAli.Saidi@ARM.com * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 278282SAli.Saidi@ARM.com * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 288282SAli.Saidi@ARM.com * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 298282SAli.Saidi@ARM.com * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 308282SAli.Saidi@ARM.com * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 318282SAli.Saidi@ARM.com * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 328282SAli.Saidi@ARM.com * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 338282SAli.Saidi@ARM.com * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 348282SAli.Saidi@ARM.com * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 358282SAli.Saidi@ARM.com * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 368282SAli.Saidi@ARM.com * 378282SAli.Saidi@ARM.com * Authors: Ali Saidi 388282SAli.Saidi@ARM.com */ 398282SAli.Saidi@ARM.com 4011793Sbrandon.potter@amd.com#include "dev/arm/a9scu.hh" 4111793Sbrandon.potter@amd.com 428282SAli.Saidi@ARM.com#include "base/intmath.hh" 438282SAli.Saidi@ARM.com#include "base/trace.hh" 448282SAli.Saidi@ARM.com#include "mem/packet.hh" 458282SAli.Saidi@ARM.com#include "mem/packet_access.hh" 468282SAli.Saidi@ARM.com#include "sim/system.hh" 478282SAli.Saidi@ARM.com 488282SAli.Saidi@ARM.comA9SCU::A9SCU(Params *p) 499808Sstever@gmail.com : BasicPioDevice(p, 0x60) 508282SAli.Saidi@ARM.com{ 518282SAli.Saidi@ARM.com} 528282SAli.Saidi@ARM.com 538282SAli.Saidi@ARM.comTick 548282SAli.Saidi@ARM.comA9SCU::read(PacketPtr pkt) 558282SAli.Saidi@ARM.com{ 568282SAli.Saidi@ARM.com assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize); 578282SAli.Saidi@ARM.com assert(pkt->getSize() == 4); 588282SAli.Saidi@ARM.com Addr daddr = pkt->getAddr() - pioAddr; 598282SAli.Saidi@ARM.com 608282SAli.Saidi@ARM.com switch(daddr) { 618282SAli.Saidi@ARM.com case Control: 628282SAli.Saidi@ARM.com pkt->set(1); // SCU already enabled 638282SAli.Saidi@ARM.com break; 648282SAli.Saidi@ARM.com case Config: 6510186Smatt.evans@arm.com /* Without making a completely new SCU, we can use the core count field 6610186Smatt.evans@arm.com * as 4 bits and inform the OS of up to 16 CPUs. Although the core 6710186Smatt.evans@arm.com * count is technically bits [1:0] only, bits [3:2] are SBZ for future 6810186Smatt.evans@arm.com * expansion like this. 6910186Smatt.evans@arm.com */ 7010186Smatt.evans@arm.com if (sys->numContexts() > 4) { 7110186Smatt.evans@arm.com warn_once("A9SCU with >4 CPUs is unsupported\n"); 7210186Smatt.evans@arm.com if (sys->numContexts() > 15) 7310186Smatt.evans@arm.com fatal("Too many CPUs (%d) for A9SCU!\n", sys->numContexts()); 7410186Smatt.evans@arm.com } 758282SAli.Saidi@ARM.com int smp_bits, core_cnt; 768282SAli.Saidi@ARM.com smp_bits = power(2,sys->numContexts()) - 1; 778282SAli.Saidi@ARM.com core_cnt = sys->numContexts() - 1; 788282SAli.Saidi@ARM.com pkt->set(smp_bits << 4 | core_cnt); 798282SAli.Saidi@ARM.com break; 808282SAli.Saidi@ARM.com default: 818282SAli.Saidi@ARM.com // Only configuration register is implemented 828282SAli.Saidi@ARM.com panic("Tried to read SCU at offset %#x\n", daddr); 838282SAli.Saidi@ARM.com break; 848282SAli.Saidi@ARM.com } 858282SAli.Saidi@ARM.com pkt->makeAtomicResponse(); 868282SAli.Saidi@ARM.com return pioDelay; 878282SAli.Saidi@ARM.com 888282SAli.Saidi@ARM.com} 898282SAli.Saidi@ARM.com 908282SAli.Saidi@ARM.comTick 918282SAli.Saidi@ARM.comA9SCU::write(PacketPtr pkt) 928282SAli.Saidi@ARM.com{ 938282SAli.Saidi@ARM.com assert(pkt->getAddr() >= pioAddr && pkt->getAddr() < pioAddr + pioSize); 948282SAli.Saidi@ARM.com 958282SAli.Saidi@ARM.com Addr daddr = pkt->getAddr() - pioAddr; 968282SAli.Saidi@ARM.com switch (daddr) { 978282SAli.Saidi@ARM.com default: 988282SAli.Saidi@ARM.com // Nothing implemented at this point 998282SAli.Saidi@ARM.com panic("Tried to write SCU at offset %#x\n", daddr); 1008282SAli.Saidi@ARM.com break; 1018282SAli.Saidi@ARM.com } 1028282SAli.Saidi@ARM.com pkt->makeAtomicResponse(); 1038282SAli.Saidi@ARM.com return pioDelay; 1048282SAli.Saidi@ARM.com} 1058282SAli.Saidi@ARM.com 1068282SAli.Saidi@ARM.comA9SCU * 1078282SAli.Saidi@ARM.comA9SCUParams::create() 1088282SAli.Saidi@ARM.com{ 1098282SAli.Saidi@ARM.com return new A9SCU(this); 1108282SAli.Saidi@ARM.com} 111