From: Arve Hjønnevåg Date: Sat, 1 Dec 2012 01:05:40 +0000 (-0800) Subject: ARM: decompressor: Flush tlb before swiching domain 0 to client mode X-Git-Tag: firefly_0821_release~4090^2~535 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=6c6f573eb2aa67ccd56a22fb55953364c644b7cf;p=firefly-linux-kernel-4.4.55.git ARM: decompressor: Flush tlb before swiching domain 0 to client mode 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 --- diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S index 032a8d987148..a7cd67383883 100644 --- a/arch/arm/boot/compressed/head.S +++ b/arch/arm/boot/compressed/head.S @@ -717,6 +717,8 @@ __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 + 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