From: Kevin Hao Date: Tue, 24 Dec 2013 07:12:03 +0000 (+0800) Subject: powerpc/fsl_booke: protect the access to MAS7 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=7c732cba3d9312882e82d91d5948261dfd5c8fe6;p=linux-beck.git powerpc/fsl_booke: protect the access to MAS7 The e500v1 doesn't implement the MAS7, so we should avoid to access this register on that implementations. In the current kernel, the access to MAS7 are protected by either CONFIG_PHYS_64BIT or MMU_FTR_BIG_PHYS. Since some code are executed before the code patching, we have to use CONFIG_PHYS_64BIT in these cases. Signed-off-by: Kevin Hao Signed-off-by: Scott Wood --- diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S index f45726a1d963..09921a5197c6 100644 --- a/arch/powerpc/kernel/head_fsl_booke.S +++ b/arch/powerpc/kernel/head_fsl_booke.S @@ -82,7 +82,9 @@ _ENTRY(_start); and r19,r3,r18 /* r19 = page offset */ andc r31,r20,r18 /* r31 = page base */ or r31,r31,r19 /* r31 = devtree phys addr */ +#ifdef CONFIG_PHYS_64BIT mfspr r30,SPRN_MAS7 +#endif li r25,0 /* phys kernel start (low) */ li r24,0 /* CPU number */ diff --git a/arch/powerpc/mm/hugetlbpage-book3e.c b/arch/powerpc/mm/hugetlbpage-book3e.c index 74551b5e41e5..646c4bffaeba 100644 --- a/arch/powerpc/mm/hugetlbpage-book3e.c +++ b/arch/powerpc/mm/hugetlbpage-book3e.c @@ -103,7 +103,8 @@ void book3e_hugetlb_preload(struct vm_area_struct *vma, unsigned long ea, if (mmu_has_feature(MMU_FTR_USE_PAIRED_MAS)) { mtspr(SPRN_MAS7_MAS3, mas7_3); } else { - mtspr(SPRN_MAS7, upper_32_bits(mas7_3)); + if (mmu_has_feature(MMU_FTR_BIG_PHYS)) + mtspr(SPRN_MAS7, upper_32_bits(mas7_3)); mtspr(SPRN_MAS3, lower_32_bits(mas7_3)); }