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Commit 7c732cba authored Dec 24, 2013 by Kevin Hao Committed by Scott Wood Jan 09, 2014

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 <haokexin@gmail.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>

parent d2dc13b5

arch/powerpc/kernel/head_fsl_booke.S

+2 −0

Original line number	Diff line number	Diff line
		@@ -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 */

arch/powerpc/mm/hugetlbpage-book3e.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -103,6 +103,7 @@ 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 {
		if (mmu_has_feature(MMU_FTR_BIG_PHYS))
		mtspr(SPRN_MAS7, upper_32_bits(mas7_3));
		mtspr(SPRN_MAS3, lower_32_bits(mas7_3));
		}