[PATCH] bsps/aarch64: Disable interrupts during MMU remap

[Kinsey Moore]

Interrupts must be disabled during MMU remapping since the majority of
RTEMS including interrupts expects normal memory mapping semantics such
as unaligned accesses.
---
 bsps/aarch64/shared/mmu/vmsav8-64.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/bsps/aarch64/shared/mmu/vmsav8-64.c b/bsps/aarch64/shared/mmu/vmsav8-64.c
index 190a05f7d5..270b9319ad 100644
--- a/bsps/aarch64/shared/mmu/vmsav8-64.c
+++ b/bsps/aarch64/shared/mmu/vmsav8-64.c
@@ -47,12 +47,16 @@ rtems_status_code aarch64_mmu_map(
 )
 {
   rtems_status_code sc;
+  ISR_Level        level;
   uint64_t max_mappable = 1LLU << aarch64_mmu_get_cpu_pa_bits();
 
   if ( addr >= max_mappable || (addr + size) > max_mappable ) {
     return RTEMS_INVALID_ADDRESS;
   }
 
+  /* Disable interrupts so they don't run while the MMU is disabled */
+  _ISR_Local_disable( level );
+
   aarch64_mmu_disable();
   sc = aarch64_mmu_map_block(
     (uint64_t *) bsp_translation_table_base,
@@ -70,5 +74,7 @@ rtems_status_code aarch64_mmu_map(
   _AARCH64_Instruction_synchronization_barrier();
   aarch64_mmu_enable();
 
+  _ISR_Local_enable( level );
+
   return sc;
 }
-- 
2.30.2