REV 2 USB virt 2.6 split driver---xenidc buffer references

This patch implements the generic code to support local and remote buffer references for the xenidc transport which is used by the USB driver.

Local buffer references are used to describe local memory and are converted into remote buffer references for communication with other domains. The other domains use remote buffer references to map the buffers into their local address space for bulk data transfer.

diff -r cf3c717101a8 -r a64ebf373f9c linux-2.6-xen-sparse/drivers/xen/xenidc/Makefile
@@ -4,3 +4,5 @@
 xenidc-objs += xenidc_callback.o
 xenidc-objs += xenidc_work.o
 xenidc-objs += xenidc_buffer_resource_provider.o
+xenidc-objs += xenidc_local_buffer_reference.o
+xenidc-objs += xenidc_remote_buffer_reference.o

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