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/*
* Copyright (c) 2021 The Regents of the University of California
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "dev/lupio/lupio_pic.hh"
#include "cpu/base.hh"
#include "debug/LupioPIC.hh"
#include "mem/packet_access.hh"
#include "params/LupioPIC.hh"
#include "sim/system.hh"
namespace gem5
{
LupioPIC::LupioPIC(const Params &params) :
BasicPioDevice(params, params.pio_size),
system(params.system),
nSrc(params.n_src),
nThread(params.num_threads),
intType(params.int_type),
mask{0},
enable{0}
{
// CPU0 receives all IRQ sources by default
enable[0] = 0xFFFFFFFF;
DPRINTF(LupioPIC, "LupioPIC initalized\n");
}
void
LupioPIC::lupioPicUpdateIRQ()
{
for (int cpu = 0; cpu < nThread; cpu++) {
auto tc = system->threads[cpu];
if (enable[cpu] & mask[cpu] & pending) {
tc->getCpuPtr()->postInterrupt(tc->threadId(), intType, 0);
} else {
tc->getCpuPtr()->clearInterrupt(tc->threadId(), intType, 0);
}
}
}
void
LupioPIC::post(int src_id)
{
gem5_assert(src_id < nSrc && src_id >= 0);
uint32_t irq_mask = 1UL << src_id;
pending |= irq_mask;
lupioPicUpdateIRQ();
}
void
LupioPIC::clear(int src_id)
{
gem5_assert(src_id < nSrc && src_id >= 0);
uint32_t irq_mask = 1UL << src_id;
pending &= ~irq_mask;
lupioPicUpdateIRQ();
}
uint64_t
LupioPIC::lupioPicRead(uint8_t addr)
{
uint32_t r = 0;
int cpu = addr / LUPIO_PIC_MAX;
int reg = addr % LUPIO_PIC_MAX;
switch (reg) {
case LUPIO_PIC_PRIO:
// Value will be 32 if there is no unmasked pending IRQ
r = ctz32(pending & mask[cpu] & enable[cpu]);
DPRINTF(LupioPIC, "Read PIC_PRIO: %d\n", r);
break;
case LUPIO_PIC_MASK:
r = mask[cpu];
DPRINTF(LupioPIC, "Read PIC_MASK: %d\n", r);
break;
case LUPIO_PIC_PEND:
r = (enable[cpu] & pending);
DPRINTF(LupioPIC, "Read PIC_PEND: %d\n", r);
break;
case LUPIO_PIC_ENAB:
r = enable[cpu];
break;
default:
panic("Unexpected read to the LupioPIC device at address %#llx!",
addr);
break;
}
return r;
}
void
LupioPIC::lupioPicWrite(uint8_t addr, uint64_t val64)
{
uint32_t val = val64;
int cpu = addr / LUPIO_PIC_MAX;
int reg = addr % LUPIO_PIC_MAX;
switch (reg) {
case LUPIO_PIC_MASK:
mask[cpu] = val;
DPRINTF(LupioPIC, "Write PIC_MASK: %d\n", mask[cpu]);
lupioPicUpdateIRQ();
break;
case LUPIO_PIC_ENAB:
enable[cpu] = val;
DPRINTF(LupioPIC, "Write PIC_ENAB: %d\n", enable[cpu]);
lupioPicUpdateIRQ();
break;
default:
panic("Unexpected write to the LupioPIC device at address %#llx!",
addr);
break;
}
}
Tick
LupioPIC::read(PacketPtr pkt)
{
Addr pic_addr = pkt->getAddr() - pioAddr;
DPRINTF(LupioPIC,
"Read request - addr: %#x, size: %#x\n", pic_addr, pkt->getSize());
uint64_t read_val = lupioPicRead(pic_addr);
DPRINTF(LupioPIC, "Packet Read: %#x\n", read_val);
pkt->setUintX(read_val, byteOrder);
pkt->makeResponse();
return pioDelay;
}
Tick
LupioPIC::write(PacketPtr pkt)
{
Addr pic_addr = pkt->getAddr() - pioAddr;
DPRINTF(LupioPIC, "Write register %#x value %#x\n", pic_addr,
pkt->getUintX(byteOrder));
lupioPicWrite(pic_addr, pkt->getUintX(byteOrder));
DPRINTF(LupioPIC, "Packet Write Value: %d\n", pkt->getUintX(byteOrder));
pkt->makeResponse();
return pioDelay;
}
} // namespace gem5