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6a75d3b3fb
Each bus gets 1 MB of address space; the actual base address for an
MCFG bus range is the address from the table plus the starting bus
number times 1 MB.
The PCI spec is unclear on this point, but this change matches what
Linux does, which is likely enough of a de facto standard regardless
of what any de jure standard might attempt to say.
Fixes: f54a3890b1f4 ("x86: Support multiple PCI MCFG regions")
Reviewed by: jhb
Differential Revision: https://reviews.freebsd.org/D43206
(cherry picked from commit 61e2161367bb4e68e603f53b1107f9427f988861)
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