x86 and ia64 have the early_ioremap()/early_memremap() functions, which are useful for supporting things like UEFI, ACPI and SMBIOS, where configuration tables need to be parsed before proper memory management is available, regardless of highmem status.
This patchset implements a restricted form of early_ioremap() and early_memremap(), available before paging_init() only. Like the x86 code on which it is based, it (p)re-uses the fixmap regions for its virtual mapping range. Up to 7 simultaneous mappings of up to 128KB can be accommodated in the available fixmap space. New for this version is the addition of the early_memremap() call, which maps a region in with uncached normal memory type. Leif Lindholm (2): Documentation: arm: early_ioremap/early_memremap arm: add early_ioremap support Documentation/arm/00-INDEX | 2 + Documentation/arm/early_ioremap.txt | 23 +++ arch/arm/Kconfig | 7 + arch/arm/include/asm/fixmap.h | 31 +++- arch/arm/include/asm/io.h | 17 +++ arch/arm/kernel/setup.c | 5 + arch/arm/mm/Makefile | 1 + arch/arm/mm/early_ioremap.c | 271 +++++++++++++++++++++++++++++++++++ arch/arm/mm/mmu.c | 4 + 9 files changed, 359 insertions(+), 2 deletions(-) create mode 100644 Documentation/arm/early_ioremap.txt create mode 100644 arch/arm/mm/early_ioremap.c -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
