arm: Add support for ARMv8 (AArch64 & AArch32)

Note: AArch64 and AArch32 interworking is not supported. If you use an AArch64
kernel you are restricted to AArch64 user-mode binaries. This will be addressed
in a later patch.

Note: Virtualization is only supported in AArch32 mode. This will also be fixed
in a later patch.

Contributors:
Giacomo Gabrielli    (TrustZone, LPAE, system-level AArch64, AArch64 NEON, validation)
Thomas Grocutt       (AArch32 Virtualization, AArch64 FP, validation)
Mbou Eyole           (AArch64 NEON, validation)
Ali Saidi            (AArch64 Linux support, code integration, validation)
Edmund Grimley-Evans (AArch64 FP)
William Wang         (AArch64 Linux support)
Rene De Jong         (AArch64 Linux support, performance opt.)
Matt Horsnell        (AArch64 MP, validation)
Matt Evans           (device models, code integration, validation)
Chris Adeniyi-Jones  (AArch64 syscall-emulation)
Prakash Ramrakhyani  (validation)
Dam Sunwoo           (validation)
Chander Sudanthi     (validation)
Stephan Diestelhorst (validation)
Andreas Hansson      (code integration, performance opt.)
Eric Van Hensbergen  (performance opt.)
Gabe Black

1 files changed, 204 insertions, 0 deletions

diff --git a/src/dev/arm/generic_timer.cc b/src/dev/arm/generic_timer.cc
new file mode 100644
index 000000000..555c1050f
--- /dev/null
+++ b/src/dev/arm/generic_timer.cc
@@ -0,0 +1,204 @@
+/*
+ * Copyright (c) 2013 ARM Limited
+ * All rights reserved.
+ *
+ * The license below extends only to copyright in the software and shall
+ * not be construed as granting a license to any other intellectual
+ * property including but not limited to intellectual property relating
+ * to a hardware implementation of the functionality of the software
+ * licensed hereunder.  You may use the software subject to the license
+ * terms below provided that you ensure that this notice is replicated
+ * unmodified and in its entirety in all distributions of the software,
+ * modified or unmodified, in source code or in binary form.
+ *
+ * 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: Giacomo Gabrielli
+ */
+
+#include "arch/arm/system.hh"
+#include "debug/Checkpoint.hh"
+#include "debug/Timer.hh"
+#include "dev/arm/base_gic.hh"
+#include "dev/arm/generic_timer.hh"
+
+void
+GenericTimer::SystemCounter::setFreq(uint32_t freq)
+{
+    if (_freq != 0) {
+        // Altering the frequency after boot shouldn't be done in practice.
+        warn_once("The frequency of the system counter has already been set");
+    }
+    _freq = freq;
+    _period = (1.0 / freq) * SimClock::Frequency;
+    _resetTick = curTick();
+}
+
+void
+GenericTimer::SystemCounter::serialize(std::ostream &os)
+{
+    SERIALIZE_SCALAR(_freq);
+    SERIALIZE_SCALAR(_period);
+    SERIALIZE_SCALAR(_resetTick);
+}
+
+void
+GenericTimer::SystemCounter::unserialize(Checkpoint *cp,
+                                         const std::string &section)
+{
+    UNSERIALIZE_SCALAR(_freq);
+    UNSERIALIZE_SCALAR(_period);
+    UNSERIALIZE_SCALAR(_resetTick);
+}
+
+void
+GenericTimer::ArchTimer::counterLimitReached()
+{
+    _control.istatus = 1;
+
+    if (!_control.enable)
+        return;
+
+    // DPRINTF(Timer, "Counter limit reached\n");
+
+    if (!_control.imask) {
+        // DPRINTF(Timer, "Causing interrupt\n");
+        _parent->_gic->sendPPInt(_intNum, _cpuNum);
+    }
+}
+
+void
+GenericTimer::ArchTimer::setCompareValue(uint64_t val)
+{
+    _counterLimit = val;
+    if (_counterLimitReachedEvent.scheduled())
+        _parent->deschedule(_counterLimitReachedEvent);
+    if (counterValue() >= _counterLimit) {
+        counterLimitReached();
+    } else {
+        _control.istatus = 0;
+        _parent->schedule(_counterLimitReachedEvent,
+             curTick() + (_counterLimit - counterValue()) * _counter->period());
+    }
+}
+
+void
+GenericTimer::ArchTimer::setTimerValue(uint32_t val)
+{
+    setCompareValue(counterValue() + sext<32>(val));
+}
+
+void
+GenericTimer::ArchTimer::setControl(uint32_t val)
+{
+    ArchTimerCtrl new_ctl = val;
+    if ((new_ctl.enable && !new_ctl.imask) &&
+        !(_control.enable && !_control.imask)) {
+        // Re-evalute the timer condition
+        if (_counterLimit >= counterValue()) {
+            _control.istatus = 1;
+
+            DPRINTF(Timer, "Causing interrupt in control\n");
+            //_parent->_gic->sendPPInt(_intNum, _cpuNum);
+        }
+    }
+    _control.enable = new_ctl.enable;
+    _control.imask = new_ctl.imask;
+}
+
+void
+GenericTimer::ArchTimer::serialize(std::ostream &os)
+{
+    SERIALIZE_SCALAR(_cpuNum);
+    SERIALIZE_SCALAR(_intNum);
+    uint32_t control_serial = _control;
+    SERIALIZE_SCALAR(control_serial);
+    SERIALIZE_SCALAR(_counterLimit);
+    bool event_scheduled = _counterLimitReachedEvent.scheduled();
+    SERIALIZE_SCALAR(event_scheduled);
+    Tick event_time;
+    if (event_scheduled) {
+        event_time = _counterLimitReachedEvent.when();
+        SERIALIZE_SCALAR(event_time);
+    }
+}
+
+void
+GenericTimer::ArchTimer::unserialize(Checkpoint *cp, const std::string &section)
+{
+    UNSERIALIZE_SCALAR(_cpuNum);
+    UNSERIALIZE_SCALAR(_intNum);
+    uint32_t control_serial;
+    UNSERIALIZE_SCALAR(control_serial);
+    _control = control_serial;
+    bool event_scheduled;
+    UNSERIALIZE_SCALAR(event_scheduled);
+    Tick event_time;
+    if (event_scheduled) {
+        UNSERIALIZE_SCALAR(event_time);
+        _parent->schedule(_counterLimitReachedEvent, event_time);
+    }
+}
+
+GenericTimer::GenericTimer(Params *p)
+    : SimObject(p), _gic(p->gic)
+{
+   for (int i = 0; i < CPU_MAX; ++i) {
+        std::stringstream oss;
+        oss << name() << ".arch_timer" << i;
+        _archTimers[i]._name = oss.str();
+        _archTimers[i]._parent = this;
+        _archTimers[i]._counter = &_systemCounter;
+        _archTimers[i]._cpuNum = i;
+        _archTimers[i]._intNum = p->int_num;
+   }
+
+   ((ArmSystem *) p->system)->setGenericTimer(this);
+}
+
+void
+GenericTimer::serialize(std::ostream &os)
+{
+    nameOut(os, csprintf("%s.sys_counter", name()));
+    _systemCounter.serialize(os);
+    for (int i = 0; i < CPU_MAX; ++i) {
+        nameOut(os, csprintf("%s.arch_timer%d", name(), i));
+        _archTimers[i].serialize(os);
+    }
+}
+
+void
+GenericTimer::unserialize(Checkpoint *cp, const std::string &section)
+{
+    _systemCounter.unserialize(cp, csprintf("%s.sys_counter", section));
+    for (int i = 0; i < CPU_MAX; ++i) {
+        _archTimers[i].unserialize(cp, csprintf("%s.arch_timer%d", section, i));
+    }
+}
+
+GenericTimer *
+GenericTimerParams::create()
+{
+    return new GenericTimer(this);
+}