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8 The io_mapping functions in linux/io-mapping.h provide an abstraction for
10 usage is to support the large graphics aperture on 32-bit processors where
14 A mapping object is created during driver initialization using::
20 mappable, while 'size' indicates how large a mapping region to
23 This _wc variant provides a mapping which may only be used with
40 undefined result. The return value points to a single page in CPU address
43 This _wc variant returns a write-combining map to the page and may only be
49 io_mapping_map_local_wc() has a side effect on X86 32bit as it disables
50 migration to make the mapping code work. No caller can rely on this side
53 io_mapping_map_atomic_wc() has the side effect of disabling preemption and
57 code uses a stack for keeping track of them::
72 undoes the side effects of the mapping functions.
74 If you need to sleep while holding a mapping, you can use the regular
80 This works like io_mapping_map_atomic/local_wc() except it has no side