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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: Ali Saidi
*/
#include "arch/sparc/regfile.hh"
Fault
SparcISA::MiscRegFile::setFSRegWithEffect(int miscReg, const MiscReg &val,
ExecContext *xc)
{
int64_t time;
SparcSystem *sys;
switch (miscReg) {
/** Full system only ASRs */
case MISCREG_SOFTINT:
if (isNonPriv())
return new PrivilegedOpcode;
// Check if we are going to interrupt because of something
int oldLevel = InterruptLevel(softint);
int newLevel = InterruptLevel(val);
setReg(miscReg, val);
if (newLevel > oldLevel)
; // MUST DO SOMETHING HERE TO TELL CPU TO LOOK FOR INTERRUPTS XXX
//xc->getCpuPtr()->checkInterrupts = true;
return NoFault;
case MISCREG_SOFTINT_CLR:
return setRegWithEffect(miscReg, ~val & softint, xc);
case MISCREG_SOFTINT_SET:
return setRegWithEffect(miscReg, val | softint, xc);
case MISCREG_TICK_CMPR:
if (isNonPriv())
return new PrivilegedOpcode;
if (tickCompare == NULL)
tickCompare = new TickCompareEvent(this, xc);
setReg(miscReg, val);
if (tick_cmprFields.int_dis && tickCompare.scheduled())
tickCompare.deschedule();
time = tick_cmprFields.tick_cmpr - tickFields.counter;
if (!tick_cmprFields.int_dis && time > 0)
tickCompare.schedule(time * xc->getCpuPtr()->cycles(1));
return NoFault;
case MISCREG_STICK:
if (isNonPriv())
return new PrivilegedOpcode;
if (isPriv())
return new PrivilegedAction;
sys = dynamic_cast<SparcSystem*>(xc->getSystemPtr());
assert(sys != NULL);
sys->sysTick = curTick/Clock::Int::ns - val & ~Bit64;
stickFields.npt = val & Bit64 ? 1 : 0;
return NoFault;
case MISCREG_STICK_CMPR:
if (isNonPriv())
return new PrivilegedOpcode;
if (sTickCompare == NULL)
sTickCompare = new STickCompareEvent(this, xc);
sys = dynamic_cast<SparcSystem*>(xc->getSystemPtr());
assert(sys != NULL);
setReg(miscReg, val);
if (stick_cmprFields.int_dis && sTickCompare.scheduled())
sTickCompare.deschedule();
time = stick_cmprFields.tick_cmpr - sys->sysTick;
if (!stick_cmprFields.int_dis && time > 0)
sTickCompare.schedule(time * Clock::Int::ns);
return NoFault;
/** Fullsystem only Priv registers. */
case MISCREG_PIL:
if (FULL_SYSTEM) {
setReg(miscReg, val);
//xc->getCpuPtr()->checkInterrupts;
// MUST DO SOMETHING HERE TO TELL CPU TO LOOK FOR INTERRUPTS XXX
return NoFault;
} else
panic("PIL not implemented for syscall emulation\n");
/** Hyper privileged registers */
case MISCREG_HPSTATE:
case MISCREG_HINTP:
setReg(miscReg, val);
return NoFault;
case MISCREG_HTSTATE:
if (tl == 0)
return new IllegalInstruction;
setReg(miscReg, val);
return NoFault;
case MISCREG_HTBA:
// clear lower 7 bits on writes.
setReg(miscReg, val & ULL(~0x7FFF));
return NoFault;
case MISCREG_STRAND_STS_REG:
setReg(miscReg, strandStatusReg);
return NoFault;
case MISCREG_HSTICK_CMPR:
if (isNonPriv())
return new PrivilegedOpcode;
if (hSTickCompare == NULL)
hSTickCompare = new HSTickCompareEvent(this, xc);
sys = dynamic_cast<SparcSystem*>(xc->getSystemPtr());
assert(sys != NULL);
setReg(miscReg, val);
if (hstick_cmprFields.int_dis && hSTickCompare.scheduled())
hSTickCompare.deschedule();
int64_t time = hstick_cmprFields.tick_cmpr - sys->sysTick;
if (!hstick_cmprFields.int_dis && time > 0)
hSTickCompare.schedule(time * Clock::Int::ns);
return NoFault;
default:
return new IllegalInstruction;
}
}
MiscReg
MiscRegFile::readFSRegWithEffect(int miscReg, Fault &fault, ExecContext * xc)
{
switch (miscReg) {
/** Privileged registers. */
case MISCREG_SOFTINT:
if (isNonPriv()) {
fault = new PrivilegedOpcode;
return 0;
}
return readReg(miscReg);
case MISCREG_TICK_CMPR:
if (isNonPriv()) {
fault = new PrivilegedOpcode;
return 0;
}
return readReg(miscReg);
case MISCREG_STICK:
SparcSystem *sys;
if (stickFields.npt && !isNonPriv()) {
fault = new PrivilegedAction;
return 0;
}
sys = dynamic_cast<SparcSystem*>(xc->getSystemPtr());
assert(sys != NULL);
return curTick/Clock::Int::ns - sys->sysTick | stickFields.npt << 63;
case MISCREG_STICK_CMPR:
if (isNonPriv()) {
fault = new PrivilegedOpcode;
return 0;
}
return readReg(miscReg);
/** Hyper privileged registers */
case MISCREG_HPSTATE:
case MISCREG_HINTP:
return readReg(miscReg);
case MISCREG_HTSTATE:
if (tl == 0) {
fault = new IllegalInstruction;
return 0;
}
return readReg(miscReg);
case MISCREG_HTBA:
return readReg(miscReg) & ULL(~0x7FFF);
case MISCREG_HVER:
return NWindows | MaxTL << 8 | MaxGL << 16;
case MISCREG_STRAND_STS_REG:
return strandStatusReg;
case MISCREG_HSTICK_CMPR:
return hstick_cmpr;
default:
fault = new IllegalInstruction;
return 0;
}
}
void
MiscRegFile::processTickCompare(ExecContext *xc)
{
panic("tick compare not implemented\n");
}
void
MiscRegFile::processSTickCompare(ExecContext *xc)
{
panic("tick compare not implemented\n");
}
void
MiscRegFile::processHSTickCompare(ExecContext *xc)
{
panic("tick compare not implemented\n");
}
}; // namespace SparcISA
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