arch: arm: Fix MMU disable function
Use dsb barrier before disabling the mmu to ensure all memory
accesses have completed. Also as per arm reference manual use
isb & dsb barriers for tlb invalidate & mmu enable, disable
functions.
CRs-Fixed: 514600
Change-Id: I7f9a041189cbf87c9b41ebefba07893b2798f037
diff --git a/arch/arm/include/arch/defines.h b/arch/arm/include/arch/defines.h
index 2041f39..d08988e 100644
--- a/arch/arm/include/arch/defines.h
+++ b/arch/arm/include/arch/defines.h
@@ -41,5 +41,12 @@
#endif
#define IS_CACHE_LINE_ALIGNED(addr) !((uint32_t) (addr) & (CACHE_LINE - 1))
+
+#if ARM_ISA_ARMV7
+#define dsb() __asm__ volatile ("dsb" : : : "memory");
+#elif ARM_ISA_ARMV6
+#define dsb() __asm__ volatile ("mcr p15, 0, %0, c7, c10, 4" : : "r" (0): "memory");
+#endif
+
#endif