private int Write(Process process, Pointer dst, int length)
{
var bytesLeft = length;
var src = _value;
var dst_buf = new ByteBufferRef(dst.ToIntPtr(), length);
var cursor = 0;
while (bytesLeft > 0)
{
var region = process.Space.Find(src);
// Invalid mapping
if (region == null || region.IsFixed)
{
return(bytesLeft);
}
var off = Arch.ArchDefinition.PageOffset(src.ToUInt32());
var virtualAddr = process.Space.UserToVirt(new UserPtr(src));
if (virtualAddr == Pointer.Zero)
{
// Page isn't present, try to bring it in.
uint permission;
Pager.HandlePageFault(process, MemoryRegion.FAULT_MASK, src, Pointer.Zero, out virtualAddr, out permission);
if (virtualAddr == Pointer.Zero)
{
break;
}
}
var virtual_page = Arch.ArchDefinition.PageIndex(virtualAddr.ToUInt32());
var page_buf = new ByteBufferRef(new IntPtr(virtual_page), Arch.ArchDefinition.PageSize);
var b = Arch.ArchDefinition.PageSize - off;
var bytesTobeCopied = b > bytesLeft ? bytesLeft : b;
var dst_buf_page = page_buf.Slice(off, bytesTobeCopied);
for (var i = 0; i < bytesTobeCopied; ++i)
{
dst_buf_page.Set(i, dst_buf.Get(cursor + i));
}
bytesLeft -= bytesTobeCopied;
src += bytesTobeCopied;
cursor += bytesTobeCopied;
}
return(bytesLeft);
}
private int Write(Process process, Pointer dst, int length)
{
var bytesLeft = length;
var src = _value;
var dst_buf = new ByteBufferRef(dst.ToIntPtr(), length);
var cursor = 0;
while (bytesLeft > 0)
{
var region = process.Space.Find(src);
// Invalid mapping
if (region == null || region.IsFixed)
{
return bytesLeft;
}
var off = Arch.ArchDefinition.PageOffset(src.ToUInt32());
var virtualAddr = process.Space.UserToVirt(new UserPtr(src));
if (virtualAddr == Pointer.Zero)
{
// Page isn't present, try to bring it in.
uint permission;
Pager.HandlePageFault(process, MemoryRegion.FAULT_MASK, src, Pointer.Zero, out virtualAddr, out permission);
if (virtualAddr == Pointer.Zero)
break;
}
var virtual_page = Arch.ArchDefinition.PageIndex(virtualAddr.ToUInt32());
var page_buf = new ByteBufferRef(new IntPtr(virtual_page), Arch.ArchDefinition.PageSize);
var b = Arch.ArchDefinition.PageSize - off;
var bytesTobeCopied = b > bytesLeft ? bytesLeft : b;
var dst_buf_page = page_buf.Slice(off, bytesTobeCopied);
for (var i = 0; i < bytesTobeCopied; ++i)
{
dst_buf_page.Set(i, dst_buf.Get(cursor + i));
}
bytesLeft -= bytesTobeCopied;
src += bytesTobeCopied;
cursor += bytesTobeCopied;
}
return bytesLeft;
}
