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Diffstat (limited to 'src/mem/vport.hh')
-rw-r--r-- | src/mem/vport.hh | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/src/mem/vport.hh b/src/mem/vport.hh new file mode 100644 index 000000000..c83836258 --- /dev/null +++ b/src/mem/vport.hh @@ -0,0 +1,79 @@ +/* + * 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 + */ + +/** + * @file + * Virtual Port Object Declaration. These ports incorporate some translation + * into their access methods. Thus you can use one to read and write data + * to/from virtual addresses. + */ + +#ifndef __MEM_VPORT_HH__ +#define __MEM_VPORT_HH__ + +#include "mem/port_impl.hh" +#include "config/full_system.hh" +#include "arch/vtophys.hh" + + +/** A class that translates a virtual address to a physical address and then + * calls the above read/write functions. If a thread context is provided the + * address can alway be translated, If not it can only be translated if it is a + * simple address masking operation (such as alpha super page accesses). + */ + +class VirtualPort : public FunctionalPort +{ + private: + ThreadContext *tc; + + public: + VirtualPort(const std::string &_name, ThreadContext *_tc = NULL) + : FunctionalPort(_name), tc(_tc) + {} + + /** Return true if we have an thread context. This is used to + * prevent someone from accidently deleting the cpus statically + * allocated vport. + * @return true if a thread context isn't valid + */ + bool nullThreadContext() { return tc != NULL; } + + /** Version of readblob that translates virt->phys and deals + * with page boundries. */ + virtual void readBlob(Addr addr, uint8_t *p, int size); + + /** Version of writeBlob that translates virt->phys and deals + * with page boundries. */ + virtual void writeBlob(Addr addr, uint8_t *p, int size); +}; + +#endif //__MEM_VPORT_HH__ + |