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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.
*/
#include "arch/sparc/miscregfile.hh"
#include "base/bitfield.hh"
#include "base/trace.hh"
#include "cpu/base.hh"
#include "cpu/thread_context.hh"
using namespace SparcISA;
void
MiscRegFile::checkSoftInt(ThreadContext *tc)
{
// If PIL < 14, copy over the tm and sm bits
if (pil < 14 && softint & 0x10000)
tc->getCpuPtr()->post_interrupt(IT_SOFT_INT,16);
else
tc->getCpuPtr()->clear_interrupt(IT_SOFT_INT,16);
if (pil < 14 && softint & 0x1)
tc->getCpuPtr()->post_interrupt(IT_SOFT_INT,0);
else
tc->getCpuPtr()->clear_interrupt(IT_SOFT_INT,0);
// Copy over any of the other bits that are set
for (int bit = 15; bit > 0; --bit) {
if (1 << bit & softint && bit > pil)
tc->getCpuPtr()->post_interrupt(IT_SOFT_INT,bit);
else
tc->getCpuPtr()->clear_interrupt(IT_SOFT_INT,bit);
}
}
void
MiscRegFile::setFSRegWithEffect(int miscReg, const MiscReg &val,
ThreadContext *tc)
{
int64_t time;
switch (miscReg) {
/* Full system only ASRs */
case MISCREG_SOFTINT:
setRegNoEffect(miscReg, val);;
checkSoftInt(tc);
break;
case MISCREG_SOFTINT_CLR:
return setReg(MISCREG_SOFTINT, ~val & softint, tc);
case MISCREG_SOFTINT_SET:
return setReg(MISCREG_SOFTINT, val | softint, tc);
case MISCREG_TICK_CMPR:
if (tickCompare == NULL)
tickCompare = new TickCompareEvent(this, tc);
setRegNoEffect(miscReg, val);
if ((tick_cmpr & ~mask(63)) && tickCompare->scheduled())
tickCompare->deschedule();
time = (tick_cmpr & mask(63)) - (tick & mask(63));
if (!(tick_cmpr & ~mask(63)) && time > 0) {
if (tickCompare->scheduled())
tickCompare->deschedule();
tickCompare->schedule(time * tc->getCpuPtr()->cycles(1));
}
panic("writing to TICK compare register %#X\n", val);
break;
case MISCREG_STICK_CMPR:
if (sTickCompare == NULL)
sTickCompare = new STickCompareEvent(this, tc);
setRegNoEffect(miscReg, val);
if ((stick_cmpr & ~mask(63)) && sTickCompare->scheduled())
sTickCompare->deschedule();
time = ((int64_t)(stick_cmpr & mask(63)) - (int64_t)stick) -
tc->getCpuPtr()->instCount();
if (!(stick_cmpr & ~mask(63)) && time > 0) {
if (sTickCompare->scheduled())
sTickCompare->deschedule();
sTickCompare->schedule(time * tc->getCpuPtr()->cycles(1) + curTick);
}
DPRINTF(Timer, "writing to sTICK compare register value %#X\n", val);
break;
case MISCREG_PSTATE:
setRegNoEffect(miscReg, val);
case MISCREG_PIL:
setRegNoEffect(miscReg, val);
checkSoftInt(tc);
break;
case MISCREG_HVER:
panic("Shouldn't be writing HVER\n");
case MISCREG_HINTP:
setRegNoEffect(miscReg, val);
if (hintp)
tc->getCpuPtr()->post_interrupt(IT_HINTP,0);
else
tc->getCpuPtr()->clear_interrupt(IT_HINTP,0);
break;
case MISCREG_HTBA:
// clear lower 7 bits on writes.
setRegNoEffect(miscReg, val & ULL(~0x7FFF));
break;
case MISCREG_QUEUE_CPU_MONDO_HEAD:
case MISCREG_QUEUE_CPU_MONDO_TAIL:
setRegNoEffect(miscReg, val);
if (cpu_mondo_head != cpu_mondo_tail)
tc->getCpuPtr()->post_interrupt(IT_CPU_MONDO,0);
else
tc->getCpuPtr()->clear_interrupt(IT_CPU_MONDO,0);
break;
case MISCREG_QUEUE_DEV_MONDO_HEAD:
case MISCREG_QUEUE_DEV_MONDO_TAIL:
setRegNoEffect(miscReg, val);
if (dev_mondo_head != dev_mondo_tail)
tc->getCpuPtr()->post_interrupt(IT_DEV_MONDO,0);
else
tc->getCpuPtr()->clear_interrupt(IT_DEV_MONDO,0);
break;
case MISCREG_QUEUE_RES_ERROR_HEAD:
case MISCREG_QUEUE_RES_ERROR_TAIL:
setRegNoEffect(miscReg, val);
if (res_error_head != res_error_tail)
tc->getCpuPtr()->post_interrupt(IT_RES_ERROR,0);
else
tc->getCpuPtr()->clear_interrupt(IT_RES_ERROR,0);
break;
case MISCREG_QUEUE_NRES_ERROR_HEAD:
case MISCREG_QUEUE_NRES_ERROR_TAIL:
setRegNoEffect(miscReg, val);
// This one doesn't have an interrupt to report to the guest OS
break;
case MISCREG_HSTICK_CMPR:
if (hSTickCompare == NULL)
hSTickCompare = new HSTickCompareEvent(this, tc);
setRegNoEffect(miscReg, val);
if ((hstick_cmpr & ~mask(63)) && hSTickCompare->scheduled())
hSTickCompare->deschedule();
time = ((int64_t)(hstick_cmpr & mask(63)) - (int64_t)stick) -
tc->getCpuPtr()->instCount();
if (!(hstick_cmpr & ~mask(63)) && time > 0) {
if (hSTickCompare->scheduled())
hSTickCompare->deschedule();
hSTickCompare->schedule(curTick + time * tc->getCpuPtr()->cycles(1));
}
DPRINTF(Timer, "writing to hsTICK compare register value %#X\n", val);
break;
case MISCREG_HPSTATE:
// T1000 spec says impl. dependent val must always be 1
setRegNoEffect(miscReg, val | HPSTATE::id);
#if FULL_SYSTEM
if (hpstate & HPSTATE::tlz && tl == 0 && !(hpstate & HPSTATE::hpriv))
tc->getCpuPtr()->post_interrupt(IT_TRAP_LEVEL_ZERO,0);
else
tc->getCpuPtr()->clear_interrupt(IT_TRAP_LEVEL_ZERO,0);
#endif
break;
case MISCREG_HTSTATE:
case MISCREG_STRAND_STS_REG:
setRegNoEffect(miscReg, val);
break;
default:
panic("Invalid write to FS misc register %s\n", getMiscRegName(miscReg));
}
}
MiscReg
MiscRegFile::readFSRegWithEffect(int miscReg, ThreadContext * tc)
{
switch (miscReg) {
/* Privileged registers. */
case MISCREG_QUEUE_CPU_MONDO_HEAD:
case MISCREG_QUEUE_CPU_MONDO_TAIL:
case MISCREG_QUEUE_DEV_MONDO_HEAD:
case MISCREG_QUEUE_DEV_MONDO_TAIL:
case MISCREG_QUEUE_RES_ERROR_HEAD:
case MISCREG_QUEUE_RES_ERROR_TAIL:
case MISCREG_QUEUE_NRES_ERROR_HEAD:
case MISCREG_QUEUE_NRES_ERROR_TAIL:
case MISCREG_SOFTINT:
case MISCREG_TICK_CMPR:
case MISCREG_STICK_CMPR:
case MISCREG_PIL:
case MISCREG_HPSTATE:
case MISCREG_HINTP:
case MISCREG_HTSTATE:
case MISCREG_STRAND_STS_REG:
case MISCREG_HSTICK_CMPR:
return readRegNoEffect(miscReg) ;
case MISCREG_HTBA:
return readRegNoEffect(miscReg) & ULL(~0x7FFF);
case MISCREG_HVER:
return NWindows | MaxTL << 8 | MaxGL << 16;
default:
panic("Invalid read to FS misc register\n");
}
}
/*
In Niagra STICK==TICK so this isn't needed
case MISCREG_STICK:
SparcSystem *sys;
sys = dynamic_cast<SparcSystem*>(tc->getSystemPtr());
assert(sys != NULL);
return curTick/Clock::Int::ns - sys->sysTick | (stick & ~(mask(63)));
*/
void
MiscRegFile::processTickCompare(ThreadContext *tc)
{
panic("tick compare not implemented\n");
}
void
MiscRegFile::processSTickCompare(ThreadContext *tc)
{
// since our microcode instructions take two cycles we need to check if
// we're actually at the correct cycle or we need to wait a little while
// more
int ticks;
ticks = ((int64_t)(stick_cmpr & mask(63)) - (int64_t)stick) -
tc->getCpuPtr()->instCount();
assert(ticks >= 0 && "stick compare missed interrupt cycle");
if (ticks == 0) {
DPRINTF(Timer, "STick compare cycle reached at %#x\n",
(stick_cmpr & mask(63)));
if (!(tc->readMiscRegNoEffect(MISCREG_STICK_CMPR) & (ULL(1) << 63))) {
setReg(MISCREG_SOFTINT, softint | (ULL(1) << 16), tc);
}
} else
sTickCompare->schedule(ticks * tc->getCpuPtr()->cycles(1) + curTick);
}
void
MiscRegFile::processHSTickCompare(ThreadContext *tc)
{
// since our microcode instructions take two cycles we need to check if
// we're actually at the correct cycle or we need to wait a little while
// more
int ticks;
ticks = ((int64_t)(hstick_cmpr & mask(63)) - (int64_t)stick) -
tc->getCpuPtr()->instCount();
assert(ticks >= 0 && "hstick compare missed interrupt cycle");
if (ticks == 0) {
DPRINTF(Timer, "HSTick compare cycle reached at %#x\n",
(stick_cmpr & mask(63)));
if (!(tc->readMiscRegNoEffect(MISCREG_HSTICK_CMPR) & (ULL(1) << 63))) {
setReg(MISCREG_HINTP, 1, tc);
}
// Need to do something to cause interrupt to happen here !!! @todo
} else
hSTickCompare->schedule(ticks * tc->getCpuPtr()->cycles(1) + curTick);
}
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