From 2a6027178ae40c1d3baa965fe21b19cbf09493ce Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= Date: Fri, 30 Nov 2012 17:05:40 -0800 Subject: [PATCH] ARM: decompressor: Flush tlb before swiching domain 0 to client mode MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit If the bootloader used a page table that is incompatible with domain 0 in client mode, and boots with the mmu on, then swithing domain 0 to client mode causes a fault if we don't flush the tlb after updating the page table pointer. v2: Add ISB before loading dacr. Signed-off-by: Arve Hjønnevåg --- arch/arm/boot/compressed/head.S | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S index 8a756870..5b9e2d4b 100644 --- a/arch/arm/boot/compressed/head.S +++ b/arch/arm/boot/compressed/head.S @@ -794,6 +794,8 @@ __armv7_mmu_cache_on: bic r6, r6, #1 << 31 @ 32-bit translation system bic r6, r6, #(7 << 0) | (1 << 4) @ 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 + mcr p15, 0, r0, c7, c5, 4 @ ISB mcrne p15, 0, r1, c3, c0, 0 @ load domain access control mcrne p15, 0, r6, c2, c0, 2 @ load ttb control #endif -- 2.28.0