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/*
* Copyright (c) 2004-2005 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.
*/
#ifndef __ARCH_ALPHA_VPTR_HH__
#define __ARCH_ALPHA_VPTR_HH__
#include "arch/vtophys.hh"
#include "arch/isa_traits.hh"
class ExecContext;
template <class T>
class VPtr
{
public:
typedef T Type;
private:
ExecContext *xc;
Addr ptr;
public:
ExecContext *GetXC() const { return xc; }
Addr GetPointer() const { return ptr; }
public:
explicit VPtr(ExecContext *_xc, Addr p = 0) : xc(_xc), ptr(p) { }
template <class U>
VPtr(const VPtr<U> &vp) : xc(vp.GetXC()), ptr(vp.GetPointer()) {}
~VPtr() {}
bool operator!() const
{
return ptr == 0;
}
VPtr<T> operator+(int offset)
{
VPtr<T> ptr(*this);
ptr += offset;
return ptr;
}
const VPtr<T> &operator+=(int offset)
{
ptr += offset;
assert((ptr & (TheISA::PageBytes - 1)) + sizeof(T)
< TheISA::PageBytes);
return *this;
}
const VPtr<T> &operator=(Addr p)
{
assert((p & (TheISA::PageBytes - 1)) + sizeof(T)
< TheISA::PageBytes);
ptr = p;
return *this;
}
template <class U>
const VPtr<T> &operator=(const VPtr<U> &vp)
{
xc = vp.GetXC();
ptr = vp.GetPointer();
return *this;
}
operator T *()
{
void *addr = vtomem(xc, ptr, sizeof(T));
return (T *)addr;
}
T *operator->()
{
void *addr = vtomem(xc, ptr, sizeof(T));
return (T *)addr;
}
T &operator*()
{
void *addr = vtomem(xc, ptr, sizeof(T));
return *(T *)addr;
}
};
#endif // __ARCH_ALPHA_VPTR_HH__
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