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| author | Josh Triplett <josh@joshtriplett.org> | 2012-09-28 17:56:08 -0700 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2012-09-29 12:21:02 -0700 |
| commit | 7bc90e01c3f66c137e7e761f574bbf883087d590 (patch) | |
| tree | b8fbf8b842eabe17ff407fe7d2f13fc12d966bc2 /include/linux/efi.h | |
| parent | 785107923a83d8456bbd8564e288a24d84109a46 (diff) | |
| download | lwn-7bc90e01c3f66c137e7e761f574bbf883087d590.tar.gz lwn-7bc90e01c3f66c137e7e761f574bbf883087d590.zip | |
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 'include/linux/efi.h')
| -rw-r--r-- | include/linux/efi.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/efi.h b/include/linux/efi.h index 5782114f4838..fff135d9375e 100644 --- a/include/linux/efi.h +++ b/include/linux/efi.h @@ -501,6 +501,7 @@ extern void efi_free_boot_services(void); #else static inline void efi_free_boot_services(void) {} #endif +extern void __iomem *efi_lookup_mapped_addr(u64 phys_addr); extern u64 efi_get_iobase (void); extern u32 efi_mem_type (unsigned long phys_addr); extern u64 efi_mem_attributes (unsigned long phys_addr); |