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| author | Josh Triplett <josh@joshtriplett.org> | 2012-09-29 04:56:08 +0400 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2012-09-29 23:21:02 +0400 |
| commit | 7bc90e01c3f66c137e7e761f574bbf883087d590 (patch) | |
| tree | b8fbf8b842eabe17ff407fe7d2f13fc12d966bc2 /drivers/acpi/bgrt.c | |
| parent | 785107923a83d8456bbd8564e288a24d84109a46 (diff) | |
| download | linux-7bc90e01c3f66c137e7e761f574bbf883087d590.tar.xz | |
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 'drivers/acpi/bgrt.c')
0 files changed, 0 insertions, 0 deletions