public long Alloc(long Size)
{
long Position = PhysPos;
Size = AMemoryHelper.PageRoundUp(Size);
PhysPos += Size;
if (PhysPos > AMemoryMgr.RamSize || PhysPos < 0)
{
throw new VmmOutOfMemoryException(Size);
}
return(Position);
}
public AMemoryMapInfo GetMapInfo(long Position)
{
if (!IsValidPosition(Position))
{
return(null);
}
Position = AMemoryHelper.PageRoundDown(Position);
PTEntry BaseEntry = GetPTEntry(Position);
bool IsSameSegment(long Pos)
{
if (!IsValidPosition(Pos))
{
return(false);
}
PTEntry Entry = GetPTEntry(Pos);
return(Entry.Map == BaseEntry.Map &&
Entry.Perm == BaseEntry.Perm &&
Entry.Type == BaseEntry.Type &&
Entry.Attr == BaseEntry.Attr);
}
long Start = Position;
long End = Position + PageSize;
while (Start > 0 && IsSameSegment(Start - PageSize))
{
Start -= PageSize;
}
while (End < AddrSize && IsSameSegment(End))
{
End += PageSize;
}
long Size = End - Start;
return(new AMemoryMapInfo(
Start,
Size,
BaseEntry.Type,
BaseEntry.Attr,
BaseEntry.Perm));
}
public void Reprotect(long Position, long Size, AMemoryPerm Perm)
{
Position = AMemoryHelper.PageRoundDown(Position);
Size = AMemoryHelper.PageRoundUp(Size);
long PagesCount = Size / PageSize;
while (PagesCount-- > 0)
{
PTEntry Entry = GetPTEntry(Position);
Entry.Perm = Perm;
SetPTEntry(Position, Entry);
Position += PageSize;
}
}
public void MapMirror(long Src, long Dst, long Size, int Type)
{
Src = AMemoryHelper.PageRoundDown(Src);
Dst = AMemoryHelper.PageRoundDown(Dst);
Size = AMemoryHelper.PageRoundUp(Size);
long PagesCount = Size / PageSize;
while (PagesCount-- > 0)
{
PTEntry Entry = GetPTEntry(Src);
Entry.Type = Type;
Entry.Map = PTMap.Mirror;
Entry.Position = Dst;
SetPTEntry(Src, Entry);
Src += PageSize;
Dst += PageSize;
}
}
public bool MapPhys(long Src, long Dst, long Size, int Type, AMemoryPerm Perm)
{
Src = AMemoryHelper.PageRoundDown(Src);
Dst = AMemoryHelper.PageRoundDown(Dst);
Size = AMemoryHelper.PageRoundUp(Size);
if (Dst < 0 || Dst + Size >= RamSize)
{
return(false);
}
long PagesCount = Size / PageSize;
while (PagesCount-- > 0)
{
SetPTEntry(Src, new PTEntry(Dst, Type, PTMap.Physical, Perm));
Src += PageSize;
Dst += PageSize;
}
return(true);
}
