armv8: mmu: Add a function to change mapping attributes
Function mmu_change_region_attr() is added to change existing mapping
with updated PXN, UXN and memory type. This is a break-before-make
process during which the mapping becomes fault (invalid) before final
attributres are set.
Signed-off-by: York Sun <york.sun@nxp.com>
diff --git a/arch/arm/include/asm/armv8/mmu.h b/arch/arm/include/asm/armv8/mmu.h
index e9b4cdb..a349903 100644
--- a/arch/arm/include/asm/armv8/mmu.h
+++ b/arch/arm/include/asm/armv8/mmu.h
@@ -53,6 +53,7 @@
#define PTE_TYPE_FAULT (0 << 0)
#define PTE_TYPE_TABLE (3 << 0)
#define PTE_TYPE_BLOCK (1 << 0)
+#define PTE_TYPE_VALID (1 << 0)
#define PTE_TABLE_PXN (1UL << 59)
#define PTE_TABLE_XN (1UL << 60)
@@ -77,6 +78,10 @@
*/
#define PMD_ATTRINDX(t) ((t) << 2)
#define PMD_ATTRINDX_MASK (7 << 2)
+#define PMD_ATTRMASK (PTE_BLOCK_PXN | \
+ PTE_BLOCK_UXN | \
+ PMD_ATTRINDX_MASK | \
+ PTE_TYPE_VALID)
/*
* TCR flags.
diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
index 766e929..9c3261c 100644
--- a/arch/arm/include/asm/system.h
+++ b/arch/arm/include/asm/system.h
@@ -226,6 +226,7 @@
void smp_kick_all_cpus(void);
void flush_l3_cache(void);
+void mmu_change_region_attr(phys_addr_t start, size_t size, u64 attrs);
/*
*Issue a secure monitor call in accordance with ARM "SMC Calling convention",