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| author | James Morse <james.morse@arm.com> | 2016-04-27 17:47:07 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2016-04-28 12:05:46 +0100 |
| commit | cabe1c81ea5be983425d117912d7883e252a3b09 (patch) | |
| tree | fdaffa85d67177412f944da52ec2443c5d432c6c /arch/arm64/kernel/head.S | |
| parent | adc9b2dfd00924e9e9b98613f36a6cb8c51f0dc6 (diff) | |
| download | linux-cabe1c81ea5be983425d117912d7883e252a3b09.tar.bz2 | |
arm64: Change cpu_resume() to enable mmu early then access sleep_sp by va
By enabling the MMU early in cpu_resume(), the sleep_save_sp and stack can
be accessed by VA, which avoids the need to convert-addresses and clean to
PoC on the suspend path.
MMU setup is shared with the boot path, meaning the swapper_pg_dir is
restored directly: ttbr1_el1 is no longer saved/restored.
struct sleep_save_sp is removed, replacing it with a single array of
pointers.
cpu_do_{suspend,resume} could be further reduced to not restore: cpacr_el1,
mdscr_el1, tcr_el1, vbar_el1 and sctlr_el1, all of which are set by
__cpu_setup(). However these values all contain res0 bits that may be used
to enable future features.
Signed-off-by: James Morse <james.morse@arm.com>
Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/kernel/head.S')
| -rw-r--r-- | arch/arm64/kernel/head.S | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S index 00a32101ab51..0674384cfc74 100644 --- a/arch/arm64/kernel/head.S +++ b/arch/arm64/kernel/head.S @@ -716,7 +716,7 @@ ENTRY(__early_cpu_boot_status) * If it isn't, park the CPU */ .section ".idmap.text", "ax" -__enable_mmu: +ENTRY(__enable_mmu) mrs x22, sctlr_el1 // preserve old SCTLR_EL1 value mrs x1, ID_AA64MMFR0_EL1 ubfx x2, x1, #ID_AA64MMFR0_TGRAN_SHIFT, 4 |