[PATCH 5/8] arm: cp15: update DACR value to activate access control

[Tom Rini]

On Fri, Feb 05, 2021 at 01:53:36PM +0100, Patrick Delaunay wrote:

> Update the initial value of Domain Access Control Register (DACR)
> and set by default the access permission to client (DACR_Dn_CLIENT = 1U)
> for each of the 16 domains and no more to all-supervisor
> (DACR_Dn_MANAGER = 3U).
> 
> This patch allows to activate the domain checking in MMU against the
> permission bits in the translation tables and avoids prefetching issue
> on ARMv7 [1].
> 
> Today it was already done for OMAP2 architecture
> ./arch/arm/mach-omap2/omap-cache.c::arm_init_domains
> introduced by commit de63ac278cba ("ARM: mmu: Set domain permissions
> to client access") which fixes lot of speculative prefetch aborts seen
> on OMAP5 secure devices.
> 
> [1] https://developer.arm.com/documentation/ddi0406/b/System-Level-Architecture/Virtual-Memory-System-Architecture--VMSA-/Memory-access-control/The-Execute-Never--XN--attribute-and-instruction-prefetching
> 
> Signed-off-by: Patrick Delaunay <patrick.delaunay at st.com>
> Reported-by: Ard Biesheuvel <ardb at kernel.org>
> Signed-off-by: Patrick Delaunay <patrick.delaunay at foss.st.com>

Applied to u-boot/next, thanks!

-- 
Tom
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