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authorMike Belopuhov <mikeb@cvs.openbsd.org>2016-01-05 13:47:29 +0000
committerMike Belopuhov <mikeb@cvs.openbsd.org>2016-01-05 13:47:29 +0000
commitd1943547d45a87eda0eaa80004f0117c5fd97f9a (patch)
tree30a3e95632a9c8a840e74405a8703719cf674837 /sys/Makefile
parenteaa3e27b1133c2b66eeb6468ebafa050ed0104d6 (diff)
Memorize the DMA segment's data offset within the page
Grant table references don't convey the information about an actual offset of the data within the page, however Xen needs to know it. We (ab)use bus_dma_segment's _ds_boundary member to store it and can get away with not restoring it's original value atm because neither i386 nor amd64 bus_dmamap_unload(9) code needs it.
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