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2015-07-07sim: Decouple draining from the SimObject hierarchyAndreas Sandberg
Draining is currently done by traversing the SimObject graph and calling drain()/drainResume() on the SimObjects. This is not ideal when non-SimObjects (e.g., ports) need draining since this means that SimObjects owning those objects need to be aware of this. This changeset moves the responsibility for finding objects that need draining from SimObjects and the Python-side of the simulator to the DrainManager. The DrainManager now maintains a set of all objects that need draining. To reduce the overhead in classes owning non-SimObjects that need draining, objects inheriting from Drainable now automatically register with the DrainManager. If such an object is destroyed, it is automatically unregistered. This means that drain() and drainResume() should never be called directly on a Drainable object. While implementing the new functionality, the DrainManager has now been made thread safe. In practice, this means that it takes a lock whenever it manipulates the set of Drainable objects since SimObjects in different threads may create Drainable objects dynamically. Similarly, the drain counter is now an atomic_uint, which ensures that it is manipulated correctly when objects signal that they are done draining. A nice side effect of these changes is that it makes the drain state changes stricter, which the simulation scripts can exploit to avoid redundant drains.
2015-07-07sim: Make the drain state a global typed enumAndreas Sandberg
The drain state enum is currently a part of the Drainable interface. The same state machine will be used by the DrainManager to identify the global state of the simulator. Make the drain state a global typed enum to better cater for this usage scenario.
2015-07-07sim: Fix broken event unserializationAndreas Sandberg
Events expected to be unserialized using an event-specific unserializeEvent call. This call was never actually used, which meant the events relying on it never got unserialized (or scheduled after unserialization). Instead of relying on a custom call, we now use the normal serialization code again. In order to schedule the event correctly, the parrent object is expected to use the EventQueue::checkpointReschedule() call. This happens automatically for events that are serialized using the AutoSerialize mechanism.
2015-07-07sim: Refactor the serialization base classAndreas Sandberg
Objects that are can be serialized are supposed to inherit from the Serializable class. This class is meant to provide a unified API for such objects. However, so far it has mainly been used by SimObjects due to some fundamental design limitations. This changeset redesigns to the serialization interface to make it more generic and hide the underlying checkpoint storage. Specifically: * Add a set of APIs to serialize into a subsection of the current object. Previously, objects that needed this functionality would use ad-hoc solutions using nameOut() and section name generation. In the new world, an object that implements the interface has the methods serializeSection() and unserializeSection() that serialize into a named /subsection/ of the current object. Calling serialize() serializes an object into the current section. * Move the name() method from Serializable to SimObject as it is no longer needed for serialization. The fully qualified section name is generated by the main serialization code on the fly as objects serialize sub-objects. * Add a scoped ScopedCheckpointSection helper class. Some objects need to serialize data structures, that are not deriving from Serializable, into subsections. Previously, this was done using nameOut() and manual section name generation. To simplify this, this changeset introduces a ScopedCheckpointSection() helper class. When this class is instantiated, it adds a new /subsection/ and subsequent serialization calls during the lifetime of this helper class happen inside this section (or a subsection in case of nested sections). * The serialize() call is now const which prevents accidental state manipulation during serialization. Objects that rely on modifying state can use the serializeOld() call instead. The default implementation simply calls serialize(). Note: The old-style calls need to be explicitly called using the serializeOld()/serializeSectionOld() style APIs. These are used by default when serializing SimObjects. * Both the input and output checkpoints now use their own named types. This hides underlying checkpoint implementation from objects that need checkpointing and makes it easier to change the underlying checkpoint storage code.
2015-06-09dev, arm: Include PIO size in AmbaDmaDevice constructorAndreas Sandberg
Make it possible to specify the size of the PIO space for an AMBA DMA device. Maintain backwards compatibility and default to zero.
2015-05-23arm, dev: Add support for a memory mapped generic timerAndreas Sandberg
There are cases when we don't want to use a system register mapped generic timer, but can't use the SP804. For example, when using KVM on aarch64, we want to intercept accesses to the generic timer, but can't do so if it is using the system register interface. In such cases, we need to use a memory-mapped generic timer. This changeset adds a device model that implements the memory mapped generic timer interface. The current implementation only supports a single frame (i.e., one virtual timer and one physical timer).
2015-05-23dev, arm: Add virtual timers to the generic timer modelAndreas Sandberg
The generic timer model currently does not support virtual counters. Virtual and physical counters both tick with the same frequency. However, virtual timers allow a hypervisor to set an offset that is subtracted from the counter when it is read. This enables the hypervisor to present a time base that ticks with virtual time in the VM (i.e., doesn't tick when the VM isn't running). Modern Linux kernels generally assume that virtual counters exist and try to use them by default.
2015-05-23dev, arm: Refactor and clean up the generic timer modelAndreas Sandberg
This changeset cleans up the generic timer a bit and moves most of the register juggling from the ISA code into a separate class in the same source file as the rest of the generic timer. It also removes the assumption that there is always 8 or fewer CPUs in the system. Instead of having a fixed limit, we now instantiate per-core timers as they are requested. This is all in preparation for other patches that add support for virtual timers and a memory mapped interface.
2015-05-23arm: Workaround incorrect HDLCD register order in kernelAndreas Sandberg
Some versions of the kernel incorrectly swap the red and blue color select registers. This changeset adds a workaround for that by swapping them when instantiating a PixelConverter.
2015-05-23base: Redesign internal frame buffer handlingAndreas Sandberg
Currently, frame buffer handling in gem5 is quite ad hoc. In practice, we pass around naked pointers to raw pixel data and expect consumers to convert frame buffers using the (broken) VideoConverter. This changeset completely redesigns the way we handle frame buffers internally. In summary, it fixes several color conversion bugs, adds support for more color formats (e.g., big endian), and makes the code base easier to follow. In the new world, gem5 always represents pixel data using the Pixel struct when pixels need to be passed between different classes (e.g., a display controller and the VNC server). Producers of entire frames (e.g., display controllers) should use the FrameBuffer class to represent a frame. Frame producers are expected to create one instance of the FrameBuffer class in their constructors and register it with its consumers once. Consumers are expected to check the dimensions of the frame buffer when they consume it. Conversion between the external representation and the internal representation is supported for all common "true color" RGB formats of up to 32-bit color depth. The external pixel representation is expected to be between 1 and 4 bytes in either big endian or little endian. Color channels are assumed to be contiguous ranges of bits within each pixel word. The external pixel value is scaled to an 8-bit internal representation using a floating multiplication to map it to the entire 8-bit range.
2015-05-05mem: Snoop into caches on uncacheable accessesAndreas Hansson
This patch takes a last step in fixing issues related to uncacheable accesses. We do not separate uncacheable memory from uncacheable devices, and in cases where it is really memory, there are valid scenarios where we need to snoop since we do not support cache maintenance instructions (yet). On snooping an uncacheable access we thus provide data if possible. In essence this makes uncacheable accesses IO coherent. The snoop filter is also queried to steer the snoops, but not updated since the uncacheable accesses do not allocate a block.
2015-04-29arch, base, dev, kern, sym: FreeBSD supportRuslan Bukin
This adds support for FreeBSD/aarch64 FS and SE mode (basic set of syscalls only) Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2015-04-23arm, dev: Add a UFS deviceRene de Jong
This patch introduces a UFS host controller and a UFS device. More information about the UFS standard can be found at the JEDEC site: http://www.jedec.org/standards-documents/results/jesd220 Note that the model does not implement the complete standard, and as such is not an actual implementation of UFS. The following SCSI commands are implemented: inquiry, read, read capacity, report LUNs, start/stop, test unit ready, verify, write, format unit, send diagnostic, synchronize cache, mode select, mode sense, request sense, unmap, write buffer and read buffer. This is sufficient for usage with Linux and Android. To interact with this model a kernel version 3.9 or above is needed.
2015-04-23arm, dev: Add a NAND flash timing modelRene de Jong
This adds a NAND flash timing model. This model takes the number of planes into account and is ultimately intended to be used as a high-level performance model for any device using flash. To access the memory, use either readMemory or writeMemory. To make use of the model you will need an interface model such as UFSHostDevice, which is part of a separate patch. At the moment the flash device is part of the ARM device tree since the only use if the UFSHostDevice, and that in turn relies on the ARM GIC.
2015-04-23dev: Add support for i2c devicesPeter Enns
This patch adds an I2C bus and base device. I2C is used to connect a variety of sensors, and this patch serves as a starting point to enable a range of I2C devices.
2015-04-23misc: Appease gcc 5.1Andreas Hansson
This patch fixes a few small issues to ensure gem5 compiles when using gcc 5.1. First, the GDB_REG_BYTES in the RemoteGDB header are, rather surprisingly, flagged as unused for both ARM and X86. Removing them, however, causes compilation errors as they are actually used in the source file. Moving the constant into the class definition fixes the issue. Possibly a gcc bug. Second, we have an unused EthPktData constructor using auto_ptr, and the latter is deprecated. Since the code is never used it is simply removed.
2015-04-08config: Support full-system with SST's memory systemCurtis Dunham
This patch adds an example configuration in ext/sst/tests/ that allows an SST/gem5 instance to simulate a 4-core AArch64 system with SST's memHierarchy components providing all the caches and memories.
2015-04-03dev: (un)serialize fix for the RTC and RTC Timer Interrupt eventsNikos Nikoleris
Restoring from a checkpoint fails if either the RTC or the RTC Timer Interrrupt event is disabled. The restored machine tried incorrectly to schedule the next event with negative offset. Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2015-04-03dev: Extend access width for IDE control registersRuslan Bukin
Add 32-bit access width for PrimaryTiming register and 16bit for UDMAControl register as FreeBSD required. Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2015-03-19arm: Add a GICv2m deviceMatt Evans
This patch adds a new PIO-accessible GICv2m shim. This shim has a PIO slave port on one side, and SPI 'wires' on the other. It accepts MSIs from the system and triggers SPIs on the GIC. It is configurable with a number of frames, each of which has a number of SPIs and a base SPI offset. A Linux driver for GICv2m is available upstream.
2015-03-19arm: Remove the 'magic MSI register' in the GIC (PL390)Matt Evans
This patch removes the code that added this magic register. A follow-up patch provides a GICv2m MSI shim that gives the same functionality in a standard ARM system architecture way.
2015-03-02dev, arm: Clean up PL011 and rewrite interrupt handlingAndreas Sandberg
The ARM PL011 UART model didn't clear and raise interrupts correctly. This changeset rewrites the whole interrupt handling and makes it both simpler and fixes several cases where the correct interrupts weren't raised or cleared. Additionally, it cleans up many other aspects of the code.
2015-03-02mem: Split port retry for all different packet classesAndreas Hansson
This patch fixes a long-standing isue with the port flow control. Before this patch the retry mechanism was shared between all different packet classes. As a result, a snoop response could get stuck behind a request waiting for a retry, even if the send/recv functions were split. This caused message-dependent deadlocks in stress-test scenarios. The patch splits the retry into one per packet (message) class. Thus, sendTimingReq has a corresponding recvReqRetry, sendTimingResp has recvRespRetry etc. Most of the changes to the code involve simply clarifying what type of request a specific object was accepting. The biggest change in functionality is in the cache downstream packet queue, facing the memory. This queue was shared by requests and snoop responses, and it is now split into two queues, each with their own flow control, but the same physical MasterPort. These changes fixes the previously seen deadlocks.
2015-02-16dev: Fix undefined behaviuor in i8254xGBeAndreas Hansson
This patch fixes a rather unfortunate oversight where the annotation pointer was used even though it is null. Somehow the code still works, but UBSan is rather unhappy. The use is now guarded, and the variable is initialised in the constructor (as well as init()).
2015-02-16arm: Wire up the GIC with the platform in the base classAndreas Sandberg
Move the (common) GIC initialization code that notifies the platform code of the new GIC to the base class (BaseGic) instead of the Pl390 implementation.
2015-02-11mem: Clarification of packet crossbar timingsMarco Balboni
This patch clarifies the packet timings annotated when going through a crossbar. The old 'firstWordDelay' is replaced by 'headerDelay' that represents the delay associated to the delivery of the header of the packet. The old 'lastWordDelay' is replaced by 'payloadDelay' that represents the delay needed to processing the payload of the packet. For now the uses and values remain identical. However, going forward the payloadDelay will be additive, and not include the headerDelay. Follow-on patches will make the headerDelay capture the pipeline latency incurred in the crossbar, whereas the payloadDelay will capture the additional serialisation delay.
2015-02-11dev: Remove unused system pointer in the Platform base classAndreas Sandberg
The Platform base class contains a pointer to an instance of the System which is never initialized. This can lead to subtle bugs since some architecture-specific platform implementations contain their own system pointer which is normally used. However, if the platform is accessed through a pointer to its base class, the dangling pointer will be used instead.
2015-02-03dev: Correctly clear interrupts in VirtIO PCIAndreas Sandberg
Correctly clear the PCI interrupt belonging to a VirtIO device when the ISR register is read.
2015-01-06dev: prevent intel 8254 timer counter events firing before startupcdirik
This change includes edits to Intel8254Timer to prevent counter events firing before startup to comply with SimObject initialization call sequence. Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2015-01-03dev: prevent RTC events firing before startupCagdas Dirik
This change includes edits to MC146818 timer to prevent RTC events firing before startup to comply with SimObject initialization call sequence. Committed by: Nilay Vaish <nilay@cs.wisc.edu>
2014-12-23arm: Add stats to table walkerCurtis Dunham
This patch adds table walker stats for: - Walk events - Instruction vs Data - Page size histogram - Wait time and service time histograms - Pending requests histogram (per cycle) - measures dist. of L (p(1..) = how often busy, p(0) = how often idle) - Squashes, before starting and after completion
2014-12-08dev: Add response sanity checks in PioPortAndreas Sandberg
Add an assert in the PioPort that checks if a response packet from a device has the right flags set before passing it to them rest of the memory system.
2014-12-08dev: Correctly transform packets into responsesAndreas Sandberg
The VirtIO devices didn't correctly set the response flags in memory packets. This changeset adds the required Packet::makeResponse() calls.
2014-12-03ide: Accept the IDLE (0xe3) ATA command.Gabe Black
This command is supposed to set up a timer which will put the drive into a standby mode if it isn't sent a command within a given time out. Since most of the timeouts are generally significantly longer than a simulation would run anyway, and we don't have an implementation for standby mode to begin with, we can accept the command, do nothing, and report success.
2014-12-03dev: Support translating left and right ALT keys.Gabe Black
This is used primarily for VNC.
2014-12-02mem: Remove redundant Packet::allocate callsAndreas Hansson
This patch cleans up the packet memory allocation confusion. The data is always allocated at the requesting side, when a packet is created (or copied), and there is never a need for any device to allocate any space if it is merely responding to a paket. This behaviour is in line with how SystemC and TLM works as well, thus increasing interoperability, and matching established conventions. The redundant calls to Packet::allocate are removed, and the checks in the function are tightened up to make sure data is only ever allocated once. There are still some oddities in the packet copy constructor where we copy the data pointer if it is static (without ownership), and allocate new space if the data is dynamic (with ownership). The latter is being worked on further in a follow-on patch.
2014-11-24misc: Another round of static analysis fixupsAndreas Hansson
Mostly addressing uninitialised members.
2014-11-21x86: pc: Put a stub IO device at port 0xed which the kernel can use for delays.Gabe Black
There was already a stub device at 0x80, the port traditionally used for an IO delay. 0x80 is also the port used for POST codes sent by firmware, and that may have prompted adding this port as a second option.
2014-11-18dev: Use fixed size member variables to describe fixed size PL111 registers.Gabe Black
2014-11-14arm: Fixes based on UBSan and static analysisAndreas Hansson
Another churn to clean up undefined behaviour, mostly ARM, but some parts also touching the generic part of the code base. Most of the fixes are simply ensuring that proper intialisation. One of the more subtle changes is the return type of the sign-extension, which is changed to uint64_t. This is to avoid shifting negative values (undefined behaviour) in the ISA code.
2014-11-12base: Revert 9277177eccff and use getenv/setenv for UTC timeAndreas Hansson
This patch reverts changeset 9277177eccff which does not do what it was intended to do. In essence, we go back to implementing mkutctime much like the non-standard timegm extension.
2014-10-20misc: Use gmtime for conversion to UTC to avoid getenv/setenvAndreas Hansson
This patch changes how we turn time into UTC. Previously we manipulated the TZ environment variable, but this has issues as the strings that are manipulated could be tainted (see e.g. CERT ENV34-C). Now we simply rely on the built-in gmtime function and avoid touching getenv/setenv all together.
2014-10-16dev: refactor pci config space for sysfs scanningGeoffrey Blake
Sysfs on ubuntu scrapes the entire PCI config space when it discovers a device using 4 byte accesses. This was not supported by our devices, in particular the NIC that implemented the extended PCI config space. This change allows the extended PCI config space to be accessed by sysfs properly.
2014-10-16dev: Use shared_ptr for EthPacketDataAndreas Hansson
This patch transitions the EthPacketData from the ad-hoc RefCountingPtr to the c++11 shared_ptr. There are no changes in behaviour, and the code modifications are mainly replacing "new" with "make_shared". The bool casting operator for the shared_ptr is explicit, and we must therefore either cast it, compare it to NULL (p != nullptr), double negate it (!!p) or do a (p ? true : false).
2014-10-01arm: More UBSan cleanups after additional full-system runsAndreas Hansson
Some incorrect casting to IntRegIndex, and a few uninitialized members in the i8254xGBe device.
2014-09-27dev: Output invalid access size in IsaFake panicCurtis Dunham
2014-09-20mem: Rename Bus to XBar to better reflect its behaviourAndreas Hansson
This patch changes the name of the Bus classes to XBar to better reflect the actual timing behaviour. The actual instances in the config scripts are not renamed, and remain as e.g. iobus or membus. As part of this renaming, the code has also been clean up slightly, making use of range-based for loops and tidying up some comments. The only changes outside the bus/crossbar code is due to the delay variables in the packet. --HG-- rename : src/mem/Bus.py => src/mem/XBar.py rename : src/mem/coherent_bus.cc => src/mem/coherent_xbar.cc rename : src/mem/coherent_bus.hh => src/mem/coherent_xbar.hh rename : src/mem/noncoherent_bus.cc => src/mem/noncoherent_xbar.cc rename : src/mem/noncoherent_bus.hh => src/mem/noncoherent_xbar.hh rename : src/mem/bus.cc => src/mem/xbar.cc rename : src/mem/bus.hh => src/mem/xbar.hh
2014-07-25energy: Add the Energy Controller in the right configsStephan Diestelhorst
Tie in the newly created energy controller components in the default configurations.
2014-09-20energy: Memory-mapped Energy Controller componentAkash Bagdia
This patch provides an Energy Controller device that provides software (driver) access to a DVFS handler. The device is currently residing in the dev/arm tree, but there is nothing inherently ARM specific in the behaviour. It is currently only tested and supported for ARM Linux, hence the location.
2014-09-20dev: Add support for 9p proxying over VirtIOAndreas Sandberg
This patch adds support for 9p filesystem proxying over VirtIO. It can currently operate by connecting to a 9p server over a socket (VirtIO9PSocket) or by starting the diod 9p server and connecting over pipe (VirtIO9PDiod). *WARNING*: Checkpoints are currently not supported for systems with 9p proxies!