3.8-stable review patch. If anyone has any objections, please let me know. ------------------ From: Will Deacon <will.deacon@xxxxxxx> commit d61947a164760ac520cb416768afdf38c33d60e7 upstream. The LPAE page table format uses 64-bit descriptors, so we need to take endianness into account when populating the swapper and idmap tables during early initialisation. This patch ensures that we store the two words making up each page table entry in the correct order when running big-endian. Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx> Tested-by: Marc Zyngier <marc.zyngier@xxxxxxx> Signed-off-by: Will Deacon <will.deacon@xxxxxxx> Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/arm/kernel/head.S | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-) --- a/arch/arm/kernel/head.S +++ b/arch/arm/kernel/head.S @@ -184,13 +184,22 @@ __create_page_tables: orr r3, r3, #3 @ PGD block type mov r6, #4 @ PTRS_PER_PGD mov r7, #1 << (55 - 32) @ L_PGD_SWAPPER -1: str r3, [r0], #4 @ set bottom PGD entry bits +1: +#ifdef CONFIG_CPU_ENDIAN_BE8 str r7, [r0], #4 @ set top PGD entry bits + str r3, [r0], #4 @ set bottom PGD entry bits +#else + str r3, [r0], #4 @ set bottom PGD entry bits + str r7, [r0], #4 @ set top PGD entry bits +#endif add r3, r3, #0x1000 @ next PMD table subs r6, r6, #1 bne 1b add r4, r4, #0x1000 @ point to the PMD tables +#ifdef CONFIG_CPU_ENDIAN_BE8 + add r4, r4, #4 @ we only write the bottom word +#endif #endif ldr r7, [r10, #PROCINFO_MM_MMUFLAGS] @ mm_mmuflags @@ -258,6 +267,11 @@ __create_page_tables: addne r6, r6, #1 << SECTION_SHIFT strne r6, [r3] +#if defined(CONFIG_LPAE) && defined(CONFIG_CPU_ENDIAN_BE8) + sub r4, r4, #4 @ Fixup page table pointer + @ for 64-bit descriptors +#endif + #ifdef CONFIG_DEBUG_LL #if !defined(CONFIG_DEBUG_ICEDCC) && !defined(CONFIG_DEBUG_SEMIHOSTING) /* @@ -276,13 +290,17 @@ __create_page_tables: orr r3, r7, r3, lsl #SECTION_SHIFT #ifdef CONFIG_ARM_LPAE mov r7, #1 << (54 - 32) @ XN +#ifdef CONFIG_CPU_ENDIAN_BE8 + str r7, [r0], #4 + str r3, [r0], #4 #else - orr r3, r3, #PMD_SECT_XN -#endif str r3, [r0], #4 -#ifdef CONFIG_ARM_LPAE str r7, [r0], #4 #endif +#else + orr r3, r3, #PMD_SECT_XN + str r3, [r0], #4 +#endif #else /* CONFIG_DEBUG_ICEDCC || CONFIG_DEBUG_SEMIHOSTING */ /* we don't need any serial debugging mappings */ -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html