arm64: mm: Create gigabyte kernel logical mappings where possible

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We have the capability to map 1GB level 1 blocks when using a 4K
granule.

This patch adjusts the create_mapping logic s.t. when mapping physical
memory on boot, we attempt to use a 1GB block if both the VA and PA
start and end are 1GB aligned. This both reduces the levels of lookup
required to resolve a kernel logical address, as well as reduces TLB
pressure on cores that support 1GB TLB entries.

Signed-off-by: Steve Capper <steve.capper@linaro.org>
Tested-by: Jungseok Lee <jays.lee@samsung.com>
[catalin.marinas@arm.com: s/prot_sect_kernel/PROT_SECT_NORMAL_EXEC/]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Steve Capper 2014-05-06 14:02:27 +01:00 • committed by Catalin Marinas

parent ba6bf8c85c

commit 206a2a73a6

3 changed files with 36 additions and 1 deletions

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2

arch/arm64/include/asm/pgtable-hwdef.h

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7

arch/arm64/include/asm/pgtable.h

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28

arch/arm64/mm/mmu.c

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