From: Mark Rutland <mark.rutland@arm.com>
Date: Tue, 24 Mar 2015 15:10:21 +0000 (+0000)
Subject: arm64: head.S: ensure idmap_t0sz is visible
X-Git-Tag: omap-for-v4.2/o2_dc~115^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0c20856c260236b96f54c452d38dbe1348ed34d2;p=pandora-kernel.git

arm64: head.S: ensure idmap_t0sz is visible

We write idmap_t0sz with SCTLR_EL1.{C,M} clear, but we only have the
guarnatee that the kernel Image is clean, not invalid in the caches, and
therefore we might read a stale value once the MMU is enabled.

This patch ensures we invalidate the corresponding cacheline after the
write as we do for all other data written before we set SCTLR_EL1.{C.M},
guaranteeing that the value will be visible later. We rely on the DSBs
in __create_page_tables to complete the maintenance.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
CC: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
---

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