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arm64: mm: Introduce 52-bit Kernel VAs

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Most of the machinery is now in place to enable 52-bit kernel VAs that
are detectable at boot time.

This patch adds a Kconfig option for 52-bit user and kernel addresses
and plumbs in the requisite CONFIG_ macros as well as sets TCR.T1SZ,
physvirt_offset and vmemmap at early boot.

To simplify things this patch also removes the 52-bit user/48-bit kernel
kconfig option.

Signed-off-by: Steve Capper <steve.capper@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Steve Capper
2019-08-07 16:55:22 +01:00
committed by Will Deacon
parent ce3aaed873
commit b6d00d47e8
8 changed files with 39 additions and 22 deletions
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2
arch/arm64/include/asm/mmu_context.h
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@@ -63,7 +63,7 @@ extern u64 idmap_ptrs_per_pgd;
static inline bool __cpu_uses_extended_idmap(void)
{
if (IS_ENABLED(CONFIG_ARM64_USER_VA_BITS_52))
if (IS_ENABLED(CONFIG_ARM64_VA_BITS_52))
return false;
return unlikely(idmap_t0sz != TCR_T0SZ(VA_BITS));