From: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
When creating a 2nd level page table from a section inherit the flags
from the section rather than assuming the section was mapped cached
previously. This fixes creating a 2nd level pagetable when the section
was mapped differently than we expected.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
arch/arm/cpu/mmu.c | 28 ++++++++++++++++++++++++----
1 file changed, 24 insertions(+), 4 deletions(-)
diff --git a/arch/arm/cpu/mmu.c b/arch/arm/cpu/mmu.c
index 6af228505dd1..6388e1bf14f6 100644
--- a/arch/arm/cpu/mmu.c
+++ b/arch/arm/cpu/mmu.c
@@ -138,6 +138,29 @@ static u32 *arm_create_pte(unsigned long virt, uint32_t flags)
return table;
}
+static u32 pmd_flags_to_pte(u32 pmd)
+{
+ u32 pte = 0;
+
+ if (pmd & PMD_SECT_BUFFERABLE)
+ pte |= PTE_BUFFERABLE;
+ if (pmd & PMD_SECT_CACHEABLE)
+ pte |= PTE_CACHEABLE;
+ if (pmd & PMD_SECT_nG)
+ pte |= PTE_EXT_NG;
+ if (pmd & PMD_SECT_XN)
+ pte |= PTE_EXT_XN;
+
+ /* TEX[2:0] */
+ pte |= PTE_EXT_TEX((pmd >> 12) & 7);
+ /* AP[1:0] */
+ pte |= ((pmd >> 10) & 0x3) << 4;
+ /* AP[2] */
+ pte |= ((pmd >> 15) & 0x1) << 9;
+
+ return pte;
+}
+
int arch_remap_range(void *start, size_t size, unsigned flags)
{
u32 addr = (u32)start;
@@ -206,11 +229,8 @@ int arch_remap_range(void *start, size_t size, unsigned flags)
* If PTE is not found it means that
* we needs to split this section and
* create a new page table for it
- *
- * NOTE: Here we assume that section
- * we just split was mapped as cached
*/
- table = arm_create_pte(addr, pte_flags_cached);
+ table = arm_create_pte(addr, pmd_flags_to_pte(*pgd));
pte = find_pte(addr);
BUG_ON(!pte);
}
--
2.29.2
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