Unify SCTLR initialization for AArch32 normal world
The values of CP15BEN, nTWI & nTWE bits in SCTLR_EL1 are architecturally
unknown if EL3 is AARCH64 whereas they reset to 1 if EL3 is AArch32. This
might be a compatibility break for legacy AArch32 normal world software if
these bits are not set to 1 when EL3 is AArch64. This patch enables the
CP15BEN, nTWI and nTWE bits in the SCTLR_EL1 if the lower non-secure EL is
AArch32. This unifies the SCTLR settings for lower non-secure EL in AArch32
mode for both AArch64 and AArch32 builds of Trusted Firmware.
Fixes ARM-software/tf-issues#428
Change-Id: I3152d1580e4869c0ea745c5bd9da765f9c254947
Signed-off-by: Soby Mathew <soby.mathew@arm.com>
diff --git a/include/lib/aarch64/arch.h b/include/lib/aarch64/arch.h
index fb8cbc0..bef6032 100644
--- a/include/lib/aarch64/arch.h
+++ b/include/lib/aarch64/arch.h
@@ -155,7 +155,10 @@
#define SCTLR_A_BIT (1 << 1)
#define SCTLR_C_BIT (1 << 2)
#define SCTLR_SA_BIT (1 << 3)
+#define SCTLR_CP15BEN_BIT (1 << 5)
#define SCTLR_I_BIT (1 << 12)
+#define SCTLR_NTWI_BIT (1 << 16)
+#define SCTLR_NTWE_BIT (1 << 18)
#define SCTLR_WXN_BIT (1 << 19)
#define SCTLR_EE_BIT (1 << 25)