Steve Capper 363524d2b1 arm64: mm: Introduce DEFAULT_MAP_WINDOW ... We wish to introduce a 52-bit virtual address space for userspace but maintain compatibility with software that assumes the maximum VA space size is 48 bit. In order to achieve this, on 52-bit VA systems, we make mmap behave as if it were running on a 48-bit VA system (unless userspace explicitly requests a VA where addr[51:48] != 0). On a system running a 52-bit userspace we need TASK_SIZE to represent the 52-bit limit as it is used in various places to distinguish between kernelspace and userspace addresses. Thus we need a new limit for mmap, stack, ELF loader and EFI (which uses TTBR0) to represent the non-extended VA space. This patch introduces DEFAULT_MAP_WINDOW and DEFAULT_MAP_WINDOW_64 and switches the appropriate logic to use that instead of TASK_SIZE. Signed-off-by: Steve Capper <steve.capper@arm.com> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>		2018-12-10 18:42:17 +00:00
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asm	arm64: mm: Introduce DEFAULT_MAP_WINDOW	2018-12-10 18:42:17 +00:00
uapi/asm	arm64: Add support for SB barrier and patch in over DSB; ISB sequences	2018-12-06 16:47:04 +00:00