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mm: create generic early_ioremap() support

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This patch creates a generic implementation of early_ioremap() support
based on the existing x86 implementation.  early_ioremp() is useful for
early boot code which needs to temporarily map I/O or memory regions
before normal mapping functions such as ioremap() are available.

Some architectures have optional MMU.  In the no-MMU case, the remap
functions simply return the passed in physical address and the unmap
functions do nothing.

Signed-off-by: Mark Salter <[email protected]>
Acked-by: Catalin Marinas <[email protected]>
Acked-by: H. Peter Anvin <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Dave Young <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mark Salter 2014-04-07 15:39:48 -07:00 • committed by Linus Torvalds
commit 9e5c33d7ae
4 changed files with 291 additions and 0 deletions
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3
mm/Kconfig
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@ -578,3 +578,6 @@ config PGTABLE_MAPPING
You can check speed with zsmalloc benchmark:
https://github.com/spartacus06/zsmapbench
config GENERIC_EARLY_IOREMAP
bool