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/*
* Copyright (c) 2006 The Regents of The University of Michigan
* 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.
*
* Authors: Steve Reinhardt
* Kevin Lim
*/
#ifndef __ARCH_ALPHA_INTERRUPT_HH__
#define __ARCH_ALPHA_INTERRUPT_HH__
#include "arch/alpha/faults.hh"
#include "arch/alpha/isa_traits.hh"
#include "cpu/thread_context.hh"
namespace AlphaISA
{
class Interrupts
{
protected:
uint64_t interrupts[NumInterruptLevels];
uint64_t intstatus;
public:
Interrupts()
{
memset(interrupts, 0, sizeof(interrupts));
intstatus = 0;
}
void post(int int_num, int index)
{
DPRINTF(Interrupt, "Interrupt %d:%d posted\n", int_num, index);
if (int_num < 0 || int_num >= NumInterruptLevels)
panic("int_num out of bounds\n");
if (index < 0 || index >= sizeof(uint64_t) * 8)
panic("int_num out of bounds\n");
interrupts[int_num] |= 1 << index;
intstatus |= (ULL(1) << int_num);
}
void clear(int int_num, int index)
{
DPRINTF(Interrupt, "Interrupt %d:%d cleared\n", int_num, index);
if (int_num < 0 || int_num >= TheISA::NumInterruptLevels)
panic("int_num out of bounds\n");
if (index < 0 || index >= sizeof(uint64_t) * 8)
panic("int_num out of bounds\n");
interrupts[int_num] &= ~(1 << index);
if (interrupts[int_num] == 0)
intstatus &= ~(ULL(1) << int_num);
}
void clear_all()
{
DPRINTF(Interrupt, "Interrupts all cleared\n");
memset(interrupts, 0, sizeof(interrupts));
intstatus = 0;
}
bool check_interrupt(int int_num) const {
if (int_num > NumInterruptLevels)
panic("int_num out of bounds\n");
return interrupts[int_num] != 0;
}
bool check_interrupts() const { return intstatus != 0; }
void serialize(std::ostream &os)
{
SERIALIZE_ARRAY(interrupts, NumInterruptLevels);
SERIALIZE_SCALAR(intstatus);
}
void unserialize(Checkpoint *cp, const std::string §ion)
{
UNSERIALIZE_ARRAY(interrupts, NumInterruptLevels);
UNSERIALIZE_SCALAR(intstatus);
}
Fault getInterrupt(ThreadContext * tc)
{
int ipl = 0;
int summary = 0;
if (tc->readMiscReg(IPR_ASTRR))
panic("asynchronous traps not implemented\n");
if (tc->readMiscReg(IPR_SIRR)) {
for (int i = INTLEVEL_SOFTWARE_MIN;
i < INTLEVEL_SOFTWARE_MAX; i++) {
if (tc->readMiscReg(IPR_SIRR) & (ULL(1) << i)) {
// See table 4-19 of 21164 hardware reference
ipl = (i - INTLEVEL_SOFTWARE_MIN) + 1;
summary |= (ULL(1) << i);
}
}
}
uint64_t interrupts = intstatus;
if (interrupts) {
for (int i = INTLEVEL_EXTERNAL_MIN;
i < INTLEVEL_EXTERNAL_MAX; i++) {
if (interrupts & (ULL(1) << i)) {
// See table 4-19 of 21164 hardware reference
ipl = i;
summary |= (ULL(1) << i);
}
}
}
if (ipl && ipl > tc->readMiscReg(IPR_IPLR)) {
tc->setMiscReg(IPR_ISR, summary);
tc->setMiscReg(IPR_INTID, ipl);
/* The following needs to be added back in somehow */
// Checker needs to know these two registers were updated.
/*#if USE_CHECKER
if (this->checker) {
this->checker->threadBase()->setMiscReg(IPR_ISR, summary);
this->checker->threadBase()->setMiscReg(IPR_INTID, ipl);
}
#endif*/
DPRINTF(Flow, "Interrupt! IPLR=%d ipl=%d summary=%x\n",
tc->readMiscReg(IPR_IPLR), ipl, summary);
return new InterruptFault;
} else {
return NoFault;
}
}
private:
uint64_t intr_status() const { return intstatus; }
};
}
#endif
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