Commit d8d23fa0 authored by Will Deacon's avatar Will Deacon
Browse files

arm64: mdscr_el1: avoid exposing DCC to userspace

We don't want to expose the DCC to userspace, particularly as there is
a kernel console driver for it.

This patch resets mdscr_el1 to disable userspace access to the DCC
registers on the cold boot path.
Signed-off-by: default avatarWill Deacon <>
parent bf0c4e04
......@@ -151,7 +151,8 @@ ENTRY(__cpu_setup)
mov x0, #3 << 20
msr cpacr_el1, x0 // Enable FP/ASIMD
msr mdscr_el1, xzr // Reset mdscr_el1
mov x0, #1 << 12 // Reset mdscr_el1 and disable
msr mdscr_el1, x0 // access to the DCC from EL0
* Memory region attributes for LPAE:
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