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Linux only implements these functions on x86. They return 0 on other
architectures. The FreeBSD implementation calls PHYS_TO_DMAP but this
panics on i386 because it does not have a direct map so return 0 on i386
as well for now. These functions are only used by graphics/drm-*-kmod
to mark the VRAM aperture write-combining but this is also accomplished
by a call to vm_phys_fictitious_reg_range so this change is sufficient
to fix drm-*-kmod on i386 for FreeBSD 14.1.
Reviewed by: kib
Approved by: re (cperciva)
Differential Revision: https://reviews.freebsd.org/D45125
(cherry picked from commit 2ae0f5a4d0931067c672be9a791909f0e32d5a0e)
(cherry picked from commit
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