path: root/init
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authorJosh Triplett <josh@joshtriplett.org>2012-09-28 17:56:08 -0700
committerH. Peter Anvin <hpa@linux.intel.com>2012-09-29 12:21:02 -0700
commit7bc90e01c3f66c137e7e761f574bbf883087d590 (patch)
treeb8fbf8b842eabe17ff407fe7d2f13fc12d966bc2 /init
parent785107923a83d8456bbd8564e288a24d84109a46 (diff)
efi: Add a function to look up existing IO memory mappings
The EFI initialization creates virtual mappings for EFI boot services memory, so if a driver wants to access EFI boot services memory, it cannot call ioremap itself; doing so will trip the WARN about mapping RAM twice. Thus, a driver accessing EFI boot services memory must do so via the existing mapping already created during EFI intiialization. Since the EFI code already maintains a memory map for that memory, add a function efi_lookup_mapped_addr to look up mappings in that memory map. Signed-off-by: Josh Triplett <josh@joshtriplett.org> Link: http://lkml.kernel.org/r/0eb48ae012797912874919110660ad420b90268b.1348876882.git.josh@joshtriplett.org Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'init')
0 files changed, 0 insertions, 0 deletions