arm64: head: move assignment of idmap_t0sz to C code

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Setting idmap_t0sz involves fiddling with the caches if done with the
MMU off. Since we will be creating an initial ID map with the MMU and
caches off, and the permanent ID map with the MMU and caches on, let's
move this assignment of idmap_t0sz out of the startup code, and replace
it with a macro that simply issues the three instructions needed to
calculate the value wherever it is needed before the MMU is turned on.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20220624150651.1358849-4-ardb@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>

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Ard Biesheuvel 2022-06-24 17:06:33 +02:00 • committed by Will Deacon

parent 0d9b1ffefa

commit e8d13cced5

5 changed files with 20 additions and 15 deletions

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14

arch/arm64/include/asm/assembler.h

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2

arch/arm64/include/asm/mmu_context.h

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13

arch/arm64/kernel/head.S

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4

arch/arm64/mm/mmu.c

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2

arch/arm64/mm/proc.S

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