From patchwork Wed Dec 12 01:41:04 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Subject: ARM: decompressor: Flush tlb before swiching domain 0 to client mode Date: Tue, 11 Dec 2012 15:41:04 -0000 From: =?utf-8?q?Arve_Hj=C3=B8nnev=C3=A5g?= X-Patchwork-Id: 205349 Message-Id: <1355276466-18295-1-git-send-email-arve@android.com> To: linux-kernel@vger.kernel.org Cc: r.sricharan@ti.com, =?UTF-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= , santosh.shilimkar@ti.com, "moderated list:ARM PORT" , rmk+kernel@arm.linux.org.uk If the bootloader used a page table that is incompatible with domain 0 in client mode, then swithing domain 0 to client mode causes a fault if we don't flush the tlb after updating the page table pointer. Signed-off-by: Arve Hjønnevåg --- arch/arm/boot/compressed/head.S | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S index 90275f0..9c8034c 100644 --- a/arch/arm/boot/compressed/head.S +++ b/arch/arm/boot/compressed/head.S @@ -704,6 +704,7 @@ __armv7_mmu_cache_on: bic r6, r6, #1 << 31 @ 32-bit translation system bic r6, r6, #3 << 0 @ use only ttbr0 mcrne p15, 0, r3, c2, c0, 0 @ load page table pointer + mcrne p15, 0, r0, c8, c7, 0 @ flush I,D TLBs mcrne p15, 0, r1, c3, c0, 0 @ load domain access control mcrne p15, 0, r6, c2, c0, 2 @ load ttb control #endif