lupio_sys.cc

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/*
 * Copyright (c) 2021 The Regents of the University of California
 * All rights reserved.
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#include "dev/lupio/lupio_sys.hh"
 
#include "debug/LupioSYS.hh"
#include "mem/packet_access.hh"
#include "params/LupioSYS.hh"
#include "sim/sim_exit.hh"
 
namespace gem5
{
 
LupioSYS::LupioSYS(const Params &params) :
    BasicPioDevice(params, params.pio_size)
{
    DPRINTF(LupioSYS, "LupioSYS initalized\n");
}
 
uint8_t
LupioSYS::lupioSYSRead(uint8_t addr)
{
    return 0;
}
 
void
LupioSYS::lupioSYSWrite(uint8_t addr, uint64_t val64)
{
    switch (addr >> 2) {
        case LUPIO_SYS_HALT:
            DPRINTF(LupioSYS, "Trying to halt\n");
            exitSimLoopNow("LUPIO_SYS_HALT called, exiting", val64, 0, false);
            break;
        case LUPIO_SYS_REBT:
            DPRINTF(LupioSYS, "Trying to reboot\n");
            exitSimLoopNow("LUPIO_SYS_REBT called, exiting", val64, 0, false);
            break;
 
        default:
            panic("Unexpected write to the LupioRTC device at address %d!",
                    addr);
            break;
    }
}
 
Tick
LupioSYS::read(PacketPtr pkt)
{
    Addr daddr = pkt->getAddr() - pioAddr;
 
    DPRINTF(LupioSYS,
        "Read request - addr: %#x, size: %#x\n", daddr, pkt->getSize());
 
    uint64_t sys_read = lupioSYSRead(daddr);
    DPRINTF(LupioSYS, "Packet Read: %#x\n", sys_read);
    pkt->setUintX(sys_read, byteOrder);
    pkt->makeResponse();
 
    return pioDelay;
}
 
Tick
LupioSYS::write(PacketPtr pkt)
{
    Addr daddr = pkt->getAddr() - pioAddr;
 
    DPRINTF(LupioSYS, "Write register %#x value %#x\n", daddr,
            pkt->getUintX(byteOrder));
 
    lupioSYSWrite(daddr, pkt->getUintX(byteOrder));
    DPRINTF(LupioSYS, "Packet Write Value: %d\n", pkt->getUintX(byteOrder));
 
    pkt->makeResponse();
 
    return pioDelay;
}
} // namespace gem5