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Commit f77d2817 authored by Kristina Martsenko's avatar Kristina Martsenko Committed by Catalin Marinas
Browse files

arm64: enable 52-bit physical address support 



Now that 52-bit physical address support is in place, add the kconfig
symbol to enable it. As described in ARMv8.2, the larger addresses are
only supported with the 64k granule. Also ensure that PAN is configured
(or TTBR0 PAN is not), as explained in an earlier patch in this series.

Tested-by: default avatarSuzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: default avatarSuzuki K Poulose <suzuki.poulose@arm.com>
Acked-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Tested-by: default avatarBob Picco <bob.picco@oracle.com>
Reviewed-by: default avatarBob Picco <bob.picco@oracle.com>
Signed-off-by: default avatarKristina Martsenko <kristina.martsenko@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent fa2a8445

arch/arm64/Kconfig

+13 −0
Original line number Diff line number Diff line
@@ -656,11 +656,24 @@ choice 
config ARM64_PA_BITS_48

	bool "48-bit"



config ARM64_PA_BITS_52

	bool "52-bit (ARMv8.2)"

	depends on ARM64_64K_PAGES

	depends on ARM64_PAN || !ARM64_SW_TTBR0_PAN

	help

	  Enable support for a 52-bit physical address space, introduced as

	  part of the ARMv8.2-LPA extension.



	  With this enabled, the kernel will also continue to work on CPUs that

	  do not support ARMv8.2-LPA, but with some added memory overhead (and

	  minor performance overhead).



endchoice



config ARM64_PA_BITS

	int

	default 48 if ARM64_PA_BITS_48

	default 52 if ARM64_PA_BITS_52



config CPU_BIG_ENDIAN

       bool "Build big-endian kernel"