src/mem/request.hh - arm/gem5 - Git at Google

 /*
  * Copyright (c) 2002-2005 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: Ron Dreslinski
  *          Steve Reinhardt
  *          Ali Saidi
  */

 /**
  * @file
  * Declaration of a request, the overall memory request consisting of
  the parts of the request that are persistent throughout the transaction.
  */

 #ifndef __MEM_REQUEST_HH__
 #define __MEM_REQUEST_HH__

 #include "base/fast_alloc.hh"
 #include "sim/host.hh"
 #include "sim/core.hh"

 #include <cassert>

 class Request;

 typedef Request* RequestPtr;


 /** ASI information for this request if it exsits. */
 const uint32_t ASI_BITS         = 0x000FF;
 /** The request is a Load locked/store conditional. */
 const uint32_t LOCKED           = 0x00100;
 /** The virtual address is also the physical address. */
 const uint32_t PHYSICAL         = 0x00200;
 /** The request is an ALPHA VPTE pal access (hw_ld). */
 const uint32_t VPTE             = 0x00400;
 /** Use the alternate mode bits in ALPHA. */
 const uint32_t ALTMODE          = 0x00800;
 /** The request is to an uncacheable address. */
 const uint32_t UNCACHEABLE      = 0x01000;
 /** The request should not cause a page fault. */
 const uint32_t NO_FAULT         = 0x02000;
 /** The request should be prefetched into the exclusive state. */
 const uint32_t PF_EXCLUSIVE     = 0x10000;
 /** The request should be marked as LRU. */
 const uint32_t EVICT_NEXT       = 0x20000;
 /** The request should ignore unaligned access faults */
 const uint32_t NO_ALIGN_FAULT   = 0x40000;
 /** The request was an instruction read. */
 const uint32_t INST_READ        = 0x80000;
 /** This request is for a memory swap. */
 const uint32_t MEM_SWAP         = 0x100000;
 const uint32_t MEM_SWAP_COND    = 0x200000;
 /** The request should ignore unaligned access faults */
 const uint32_t NO_HALF_WORD_ALIGN_FAULT = 0x400000;


 class Request : public FastAlloc
 {
   private:
     /**
      * The physical address of the request. Valid only if validPaddr
      * is set. */
     Addr paddr;

     /**
      * The size of the request. This field must be set when vaddr or
      * paddr is written via setVirt() or setPhys(), so it is always
      * valid as long as one of the address fields is valid.  */
     int size;

     /** Flag structure for the request. */
     uint32_t flags;

     /**
      * The time this request was started. Used to calculate
      * latencies. This field is set to curTick any time paddr or vaddr
      * is written.  */
     Tick time;

     /** The address space ID. */
     int asid;

     /** This request is to a memory mapped register. */
     bool mmapedIpr;

     /** The virtual address of the request. */
     Addr vaddr;

     /** Extra data for the request, such as the return value of
      * store conditional or the compare value for a CAS. */
     uint64_t extraData;

     /** The context ID (for statistics, typically). */
     int _contextId;
     /** The thread ID (id within this CPU) */
     int _threadId;

     /** program counter of initiating access; for tracing/debugging */
     Addr pc;

     /** Whether or not paddr is valid (has been written yet). */
     bool validPaddr;
     /** Whether or not the asid & vaddr are valid. */
     bool validAsidVaddr;
     /** Whether or not the sc result is valid. */
     bool validExData;
     /** Whether or not the context ID is valid. */
     bool validContextAndThreadIds;
     /** Whether or not the pc is valid. */
     bool validPC;

   public:
     /** Minimal constructor.  No fields are initialized. */
     Request()
         : validPaddr(false), validAsidVaddr(false),
           validExData(false), validContextAndThreadIds(false), validPC(false)
     {}

     /**
      * Constructor for physical (e.g. device) requests.  Initializes
      * just physical address, size, flags, and timestamp (to curTick).
      * These fields are adequate to perform a request.  */
     Request(Addr _paddr, int _size, int _flags)
         : validContextAndThreadIds(false)
     { setPhys(_paddr, _size, _flags); }

     Request(int _asid, Addr _vaddr, int _size, int _flags, Addr _pc,
             int _context_id, int _thread_id)
     {
         setThreadContext(_context_id, _thread_id);
         setVirt(_asid, _vaddr, _size, _flags, _pc);
     }

     ~Request() {}  // for FastAlloc

     /**
      * Set up CPU and thread numbers. */
     void setThreadContext(int _context_id, int _thread_id)
     {
         _contextId = _context_id;
         _threadId = _thread_id;
         validContextAndThreadIds = true;
     }

     /**
      * Set up a physical (e.g. device) request in a previously
      * allocated Request object. */
     void setPhys(Addr _paddr, int _size, int _flags)
     {
         paddr = _paddr;
         size = _size;
         flags = _flags;
         time = curTick;
         validPaddr = true;
         validAsidVaddr = false;
         validPC = false;
         validExData = false;
         mmapedIpr = false;
     }

     /**
      * Set up a virtual (e.g., CPU) request in a previously
      * allocated Request object. */
     void setVirt(int _asid, Addr _vaddr, int _size, int _flags, Addr _pc)
     {
         asid = _asid;
         vaddr = _vaddr;
         size = _size;
         flags = _flags;
         pc = _pc;
         time = curTick;
         validPaddr = false;
         validAsidVaddr = true;
         validPC = true;
         validExData = false;
         mmapedIpr = false;
     }

     /** Set just the physical address.  This should only be used to
      * record the result of a translation, and thus the vaddr must be
      * valid before this method is called.  Otherwise, use setPhys()
      * to guarantee that the size and flags are also set.
      */
     void setPaddr(Addr _paddr)
     {
         assert(validAsidVaddr);
         paddr = _paddr;
         validPaddr = true;
     }

     /** Accessor for paddr. */
     Addr getPaddr() { assert(validPaddr); return paddr; }

     /** Accessor for size. */
     int getSize() { assert(validPaddr || validAsidVaddr); return size; }
     /** Accessor for time. */
     Tick getTime() { assert(validPaddr || validAsidVaddr); return time; }
     void resetTime() { assert(validPaddr || validAsidVaddr); time = curTick; }
     void
     setTime(Tick when)
     {
         assert(validPaddr || validAsidVaddr);
         time = when;
     }

     /** Accessor for flags. */
     uint32_t getFlags() { assert(validPaddr || validAsidVaddr); return flags; }
     /** Accessor for paddr. */
     void setFlags(uint32_t _flags)
     { assert(validPaddr || validAsidVaddr); flags = _flags; }

     /** Accessor function for vaddr.*/
     Addr getVaddr() { assert(validAsidVaddr); return vaddr; }

     /** Accessor function for asid.*/
     int getAsid() { assert(validAsidVaddr); return asid; }

     /** Accessor function for asi.*/
     uint8_t getAsi() { assert(validAsidVaddr); return flags & ASI_BITS; }

     /** Accessor function for asi.*/
     void setAsi(uint8_t a)
     { assert(validAsidVaddr); flags = (flags & ~ASI_BITS) | a; }

     /** Accessor function for asi.*/
     bool isMmapedIpr() { assert(validPaddr); return mmapedIpr; }

     /** Accessor function for asi.*/
     void setMmapedIpr(bool r) { assert(validAsidVaddr); mmapedIpr = r; }

     /** Accessor function to check if sc result is valid. */
     bool extraDataValid() { return validExData; }
     /** Accessor function for store conditional return value.*/
     uint64_t getExtraData() { assert(validExData); return extraData; }
     /** Accessor function for store conditional return value.*/
     void setExtraData(uint64_t _extraData)
     { extraData = _extraData; validExData = true; }

     /** Accessor function for context ID.*/
     int contextId() { assert(validContextAndThreadIds); return _contextId; }
     /** Accessor function for thread ID. */
     int threadId() { assert(validContextAndThreadIds); return _threadId; }

     /** Accessor function for pc.*/
     Addr getPC() { assert(validPC); return pc; }

     /** Accessor Function to Check Cacheability. */
     bool isUncacheable() { return (getFlags() & UNCACHEABLE) != 0; }

     bool isInstRead() { return (getFlags() & INST_READ) != 0; }

     bool isLocked() { return (getFlags() & LOCKED) != 0; }

     bool isSwap() { return (getFlags() & MEM_SWAP ||
                             getFlags() & MEM_SWAP_COND); }

     bool isCondSwap() { return (getFlags() & MEM_SWAP_COND) != 0; }

     bool inline isMisaligned() {return (!(getFlags() & NO_ALIGN_FAULT) &&
                                         ((vaddr & 1)  ||
                                          (!(getFlags() & NO_HALF_WORD_ALIGN_FAULT)
                                           && (vaddr & 0x2))));}

     friend class Packet;
 };

 #endif // __MEM_REQUEST_HH__
	/*
	* Copyright (c) 2002-2005 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: Ron Dreslinski
	* Steve Reinhardt
	* Ali Saidi
	*/

	/**
	* @file
	* Declaration of a request, the overall memory request consisting of
	the parts of the request that are persistent throughout the transaction.
	*/

	#ifndef __MEM_REQUEST_HH__
	#define __MEM_REQUEST_HH__

	#include "base/fast_alloc.hh"
	#include "sim/host.hh"
	#include "sim/core.hh"

	#include <cassert>

	class Request;

	typedef Request* RequestPtr;


	/** ASI information for this request if it exsits. */
	const uint32_t ASI_BITS = 0x000FF;
	/** The request is a Load locked/store conditional. */
	const uint32_t LOCKED = 0x00100;
	/** The virtual address is also the physical address. */
	const uint32_t PHYSICAL = 0x00200;
	/** The request is an ALPHA VPTE pal access (hw_ld). */
	const uint32_t VPTE = 0x00400;
	/** Use the alternate mode bits in ALPHA. */
	const uint32_t ALTMODE = 0x00800;
	/** The request is to an uncacheable address. */
	const uint32_t UNCACHEABLE = 0x01000;
	/** The request should not cause a page fault. */
	const uint32_t NO_FAULT = 0x02000;
	/** The request should be prefetched into the exclusive state. */
	const uint32_t PF_EXCLUSIVE = 0x10000;
	/** The request should be marked as LRU. */
	const uint32_t EVICT_NEXT = 0x20000;
	/** The request should ignore unaligned access faults */
	const uint32_t NO_ALIGN_FAULT = 0x40000;
	/** The request was an instruction read. */
	const uint32_t INST_READ = 0x80000;
	/** This request is for a memory swap. */
	const uint32_t MEM_SWAP = 0x100000;
	const uint32_t MEM_SWAP_COND = 0x200000;
	/** The request should ignore unaligned access faults */
	const uint32_t NO_HALF_WORD_ALIGN_FAULT = 0x400000;


	class Request : public FastAlloc
	{
	private:
	/**
	* The physical address of the request. Valid only if validPaddr
	* is set. */
	Addr paddr;

	/**
	* The size of the request. This field must be set when vaddr or
	* paddr is written via setVirt() or setPhys(), so it is always
	* valid as long as one of the address fields is valid. */
	int size;

	/** Flag structure for the request. */
	uint32_t flags;

	/**
	* The time this request was started. Used to calculate
	* latencies. This field is set to curTick any time paddr or vaddr
	* is written. */
	Tick time;

	/** The address space ID. */
	int asid;

	/** This request is to a memory mapped register. */
	bool mmapedIpr;

	/** The virtual address of the request. */
	Addr vaddr;

	/** Extra data for the request, such as the return value of
	* store conditional or the compare value for a CAS. */
	uint64_t extraData;

	/** The context ID (for statistics, typically). */
	int _contextId;
	/** The thread ID (id within this CPU) */
	int _threadId;

	/** program counter of initiating access; for tracing/debugging */
	Addr pc;

	/** Whether or not paddr is valid (has been written yet). */
	bool validPaddr;
	/** Whether or not the asid & vaddr are valid. */
	bool validAsidVaddr;
	/** Whether or not the sc result is valid. */
	bool validExData;
	/** Whether or not the context ID is valid. */
	bool validContextAndThreadIds;
	/** Whether or not the pc is valid. */
	bool validPC;

	public:
	/** Minimal constructor. No fields are initialized. */
	Request()
	: validPaddr(false), validAsidVaddr(false),
	validExData(false), validContextAndThreadIds(false), validPC(false)
	{}

	/**
	* Constructor for physical (e.g. device) requests. Initializes
	* just physical address, size, flags, and timestamp (to curTick).
	* These fields are adequate to perform a request. */
	Request(Addr _paddr, int _size, int _flags)
	: validContextAndThreadIds(false)
	{ setPhys(_paddr, _size, _flags); }

	Request(int _asid, Addr _vaddr, int _size, int _flags, Addr _pc,
	int _context_id, int _thread_id)
	{
	setThreadContext(_context_id, _thread_id);
	setVirt(_asid, _vaddr, _size, _flags, _pc);
	}

	~Request() {} // for FastAlloc

	/**
	* Set up CPU and thread numbers. */
	void setThreadContext(int _context_id, int _thread_id)
	{
	_contextId = _context_id;
	_threadId = _thread_id;
	validContextAndThreadIds = true;
	}

	/**
	* Set up a physical (e.g. device) request in a previously
	* allocated Request object. */
	void setPhys(Addr _paddr, int _size, int _flags)
	{
	paddr = _paddr;
	size = _size;
	flags = _flags;
	time = curTick;
	validPaddr = true;
	validAsidVaddr = false;
	validPC = false;
	validExData = false;
	mmapedIpr = false;
	}

	/**
	* Set up a virtual (e.g., CPU) request in a previously
	* allocated Request object. */
	void setVirt(int _asid, Addr _vaddr, int _size, int _flags, Addr _pc)
	{
	asid = _asid;
	vaddr = _vaddr;
	size = _size;
	flags = _flags;
	pc = _pc;
	time = curTick;
	validPaddr = false;
	validAsidVaddr = true;
	validPC = true;
	validExData = false;
	mmapedIpr = false;
	}

	/** Set just the physical address. This should only be used to
	* record the result of a translation, and thus the vaddr must be
	* valid before this method is called. Otherwise, use setPhys()
	* to guarantee that the size and flags are also set.
	*/
	void setPaddr(Addr _paddr)
	{
	assert(validAsidVaddr);
	paddr = _paddr;
	validPaddr = true;
	}

	/** Accessor for paddr. */
	Addr getPaddr() { assert(validPaddr); return paddr; }

	/** Accessor for size. */
	int getSize() { assert(validPaddr \|\| validAsidVaddr); return size; }
	/** Accessor for time. */
	Tick getTime() { assert(validPaddr \|\| validAsidVaddr); return time; }
	void resetTime() { assert(validPaddr \|\| validAsidVaddr); time = curTick; }
	void
	setTime(Tick when)
	{
	assert(validPaddr \|\| validAsidVaddr);
	time = when;
	}

	/** Accessor for flags. */
	uint32_t getFlags() { assert(validPaddr \|\| validAsidVaddr); return flags; }
	/** Accessor for paddr. */
	void setFlags(uint32_t _flags)
	{ assert(validPaddr \|\| validAsidVaddr); flags = _flags; }

	/** Accessor function for vaddr.*/
	Addr getVaddr() { assert(validAsidVaddr); return vaddr; }

	/** Accessor function for asid.*/
	int getAsid() { assert(validAsidVaddr); return asid; }

	/** Accessor function for asi.*/
	uint8_t getAsi() { assert(validAsidVaddr); return flags & ASI_BITS; }

	/** Accessor function for asi.*/
	void setAsi(uint8_t a)
	{ assert(validAsidVaddr); flags = (flags & ~ASI_BITS) \| a; }

	/** Accessor function for asi.*/
	bool isMmapedIpr() { assert(validPaddr); return mmapedIpr; }

	/** Accessor function for asi.*/
	void setMmapedIpr(bool r) { assert(validAsidVaddr); mmapedIpr = r; }

	/** Accessor function to check if sc result is valid. */
	bool extraDataValid() { return validExData; }
	/** Accessor function for store conditional return value.*/
	uint64_t getExtraData() { assert(validExData); return extraData; }
	/** Accessor function for store conditional return value.*/
	void setExtraData(uint64_t _extraData)
	{ extraData = _extraData; validExData = true; }

	/** Accessor function for context ID.*/
	int contextId() { assert(validContextAndThreadIds); return _contextId; }
	/** Accessor function for thread ID. */
	int threadId() { assert(validContextAndThreadIds); return _threadId; }

	/** Accessor function for pc.*/
	Addr getPC() { assert(validPC); return pc; }

	/** Accessor Function to Check Cacheability. */
	bool isUncacheable() { return (getFlags() & UNCACHEABLE) != 0; }

	bool isInstRead() { return (getFlags() & INST_READ) != 0; }

	bool isLocked() { return (getFlags() & LOCKED) != 0; }

	bool isSwap() { return (getFlags() & MEM_SWAP \|\|
	getFlags() & MEM_SWAP_COND); }

	bool isCondSwap() { return (getFlags() & MEM_SWAP_COND) != 0; }

	bool inline isMisaligned() {return (!(getFlags() & NO_ALIGN_FAULT) &&
	((vaddr & 1) \|\|
	(!(getFlags() & NO_HALF_WORD_ALIGN_FAULT)
	&& (vaddr & 0x2))));}

	friend class Packet;
	};

	#endif // __MEM_REQUEST_HH__