swiotlb: allow architectures to override swiotlb pool allocation
Impact: generalize swiotlb allocation code Architectures may need to allocate memory specially for use with the swiotlb. Create the weak function swiotlb_alloc_boot() and swiotlb_alloc() defaulting to the current behaviour. Signed-off-by: NJeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: NIan Campbell <ian.campbell@citrix.com> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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