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iommu/io-pgtable-arm-v7s: Check table PTEs more precisely 

Whilst we don't support the PXN bit at all, so should never encounter a
level 1 section or supersection PTE with it set, it would still be wise
to check both table type bits to resolve any theoretical ambiguity.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Robin Murphy 2017-06-22 16:53:50 +01:00 committed by Will Deacon
parent 5c2d021829
commit 9db829d281
1 changed files with 2 additions and 1 deletions
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3
drivers/iommu/io-pgtable-arm-v7s.c
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@ -92,7 +92,8 @@
#define ARM_V7S_PTE_TYPE_CONT_PAGE 0x1
#define ARM_V7S_PTE_IS_VALID(pte) (((pte) & 0x3) != 0)
#define ARM_V7S_PTE_IS_TABLE(pte, lvl) (lvl == 1 && ((pte) & ARM_V7S_PTE_TYPE_TABLE))
#define ARM_V7S_PTE_IS_TABLE(pte, lvl) \
((lvl) == 1 && (((pte) & 0x3) == ARM_V7S_PTE_TYPE_TABLE))
/* Page table bits */
#define ARM_V7S_ATTR_XN(lvl) BIT(4 * (2 - (lvl)))