Merge changes from topic "aa/sel2_support" into integration
* changes:
S-EL2 Support: Check for AArch64
Add support for enabling S-EL2
diff --git a/include/arch/aarch64/arch.h b/include/arch/aarch64/arch.h
index 3ff2912..1fcd0f9 100644
--- a/include/arch/aarch64/arch.h
+++ b/include/arch/aarch64/arch.h
@@ -140,6 +140,8 @@
#define ID_AA64PFR0_GIC_MASK ULL(0xf)
#define ID_AA64PFR0_SVE_SHIFT U(32)
#define ID_AA64PFR0_SVE_MASK ULL(0xf)
+#define ID_AA64PFR0_SEL2_SHIFT U(36)
+#define ID_AA64PFR0_SEL2_MASK ULL(0xf)
#define ID_AA64PFR0_MPAM_SHIFT U(40)
#define ID_AA64PFR0_MPAM_MASK ULL(0xf)
#define ID_AA64PFR0_DIT_SHIFT U(48)
@@ -285,6 +287,7 @@
#define SCR_RES1_BITS ((U(1) << 4) | (U(1) << 5))
#define SCR_ATA_BIT (U(1) << 26)
#define SCR_FIEN_BIT (U(1) << 21)
+#define SCR_EEL2_BIT (U(1) << 18)
#define SCR_API_BIT (U(1) << 17)
#define SCR_APK_BIT (U(1) << 16)
#define SCR_TWE_BIT (U(1) << 13)
diff --git a/lib/el3_runtime/aarch64/context_mgmt.c b/lib/el3_runtime/aarch64/context_mgmt.c
index d65e02d..b7908ad 100644
--- a/lib/el3_runtime/aarch64/context_mgmt.c
+++ b/lib/el3_runtime/aarch64/context_mgmt.c
@@ -181,6 +181,16 @@
scr_el3 |= SCR_HCE_BIT;
}
+ /* Enable S-EL2 if the next EL is EL2 and security state is secure */
+ if ((security_state == SECURE) && (GET_EL(ep->spsr) == MODE_EL2)) {
+ if (GET_RW(ep->spsr) != MODE_RW_64) {
+ ERROR("S-EL2 can not be used in AArch32.");
+ panic();
+ }
+
+ scr_el3 |= SCR_EEL2_BIT;
+ }
+
/*
* Initialise SCTLR_EL1 to the reset value corresponding to the target
* execution state setting all fields rather than relying of the hw.