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physio() to UIO_SYSSPACE
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physio() to UIO_SYSSPACE

  • Subject: physio() to UIO_SYSSPACE
  • From: Sam Vaughan <email@hidden>
  • Date: Tue, 7 Oct 2003 16:31:57 +1000
physio() seems to be aware of the possibility that it might be called to do I/O to kernel memory, yet it sets the B_PHYS flag regardless. This means that when the request hits the I/O kit in dkreadwrite, IOMemoryDescriptor::withAddress() will get called with the user task instead of the kernel task. The result is a failure in IOGeneralMemoryDescriptor::prepare().

I'm currently circumventing this behaviour with a hack. If it's UIO_SYSSPACE I mark the buffer in some way, then when my strategy routine is called I check for the mark and clear the B_PHYS flag. This works, but I'm curious to know if there's a better way.

Sam
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