arm64: kernel: use literal for relocated address of __secondary_switched
authorArd Biesheuvel <ard.biesheuvel@linaro.org>
Mon, 18 Apr 2016 15:09:42 +0000 (17:09 +0200)
committerWill Deacon <will.deacon@arm.com>
Tue, 26 Apr 2016 11:19:55 +0000 (12:19 +0100)
commite5ebeec879b726c755af0c1c15f3699b53268cd5
treee33413661d6ed1909e2331a3930a20d2d66528dd
parent190c056fc32a528979807cb5d5a0d68285933073
arm64: kernel: use literal for relocated address of __secondary_switched

We can simply use a relocated 64-bit literal to store the address of
__secondary_switched(), and the relocation code will ensure that it
holds the correct value at secondary entry time, as long as we make sure
that the literal is not dereferenced until after we have enabled the MMU.

So jump via a small __secondary_switch() function covered by the ID map
that performs the literal load and branch-to-register.

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
arch/arm64/kernel/head.S