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Diffstat (limited to 'src/dev/arm/gic_v2m.hh')
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1 files changed, 121 insertions, 0 deletions
diff --git a/src/dev/arm/gic_v2m.hh b/src/dev/arm/gic_v2m.hh new file mode 100644 index 000000000..11ee6bea5 --- /dev/null +++ b/src/dev/arm/gic_v2m.hh @@ -0,0 +1,121 @@ +/* + * 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: Matt Evans + */ + +/** @file + * Implementiation of a GICv2m MSI shim. + * + * See gic_v2m.cc for an instantiation example. + */ + +#ifndef __DEV_ARM_GIC_V2M_H__ +#define __DEV_ARM_GIC_V2M_H__ + +#include "base/bitunion.hh" +#include "cpu/intr_control.hh" +#include "dev/arm/base_gic.hh" +#include "dev/io_device.hh" +#include "dev/platform.hh" +#include "params/Gicv2m.hh" +#include "params/Gicv2mFrame.hh" + +/** + * Ultimately this class should be embedded in the Gicv2m class, but + * this confuses Python as 'Gicv2m::Frame' gets interpreted as 'Frame' + * in namespace Gicv2m. + */ +class Gicv2mFrame : public SimObject +{ + public: + const Addr addr; + const unsigned int spi_base; + const unsigned int spi_len; + + typedef Gicv2mFrameParams Params; + Gicv2mFrame(const Params *p) : + SimObject(p), addr(p->addr), spi_base(p->spi_base), spi_len(p->spi_len) + {} +}; + +class Gicv2m : public PioDevice +{ + private: + static const int FRAME_SIZE = 0x10000; + + static const int MSI_TYPER = 0x0008; + static const int MSI_SETSPI_NSR = 0x0040; + static const int PER_ID4 = 0x0fd0; + + /** Latency for an MMIO operation */ + const Tick pioDelay; + + /** A set of configured hardware frames */ + std::vector<Gicv2mFrame *> frames; + + /** Gic to which we fire interrupts */ + BaseGic *gic; + + /** Count of number of configured frames, as log2(frames) */ + unsigned int log2framenum; + + public: + typedef Gicv2mParams Params; + Gicv2m(const Params *p); + + /** @{ */ + /** Return the address ranges used by the Gicv2m + * This is the set of frame addresses + */ + virtual AddrRangeList getAddrRanges() const; + + /** A PIO read to the device + */ + virtual Tick read(PacketPtr pkt); + + /** A PIO read to the device + */ + virtual Tick write(PacketPtr pkt); + /** @} */ + + private: + /** Determine which frame a PIO access lands in + */ + int frameFromAddr(Addr a) const; +}; + +#endif //__DEV_ARM_GIC_V2M_H__ |