feat(hcx): add build option to enable FEAT_HCX
FEAT_HCX adds the extended hypervisor configuration register (HCRX_EL2)
and access to this register must be explicitly enabled through the
SCR_EL3.HXEn bit. This patch adds a new build flag ENABLE_FEAT_HCX to
allow the register to be accessed from EL2.
Signed-off-by: John Powell <john.powell@arm.com>
Change-Id: Ibb36ad90622f1dc857adab4b0d4d7a89456a522b
diff --git a/include/arch/aarch64/arch.h b/include/arch/aarch64/arch.h
index 9ea1114..d260ecf 100644
--- a/include/arch/aarch64/arch.h
+++ b/include/arch/aarch64/arch.h
@@ -281,6 +281,11 @@
#define ID_AA64MMFR1_EL1_VHE_SHIFT U(8)
#define ID_AA64MMFR1_EL1_VHE_MASK ULL(0xf)
+#define ID_AA64MMFR1_EL1_HCX_SHIFT U(40)
+#define ID_AA64MMFR1_EL1_HCX_MASK ULL(0xf)
+#define ID_AA64MMFR1_EL1_HCX_SUPPORTED ULL(0x1)
+#define ID_AA64MMFR1_EL1_HCX_NOT_SUPPORTED ULL(0x0)
+
/* ID_AA64MMFR2_EL1 definitions */
#define ID_AA64MMFR2_EL1 S3_0_C0_C7_2
@@ -429,6 +434,7 @@
#define SCR_RES1_BITS ((U(1) << 4) | (U(1) << 5))
#define SCR_TWEDEL_SHIFT U(30)
#define SCR_TWEDEL_MASK ULL(0xf)
+#define SCR_HXEn_BIT (UL(1) << 38)
#define SCR_AMVOFFEN_BIT (UL(1) << 35)
#define SCR_TWEDEn_BIT (UL(1) << 29)
#define SCR_ECVEN_BIT (UL(1) << 28)
@@ -1144,6 +1150,16 @@
#define GCR_EL1 S3_0_C1_C0_6
/*******************************************************************************
+ * FEAT_HCX - Extended Hypervisor Configuration Register
+ ******************************************************************************/
+#define HCRX_EL2 S3_4_C1_C2_2
+#define HCRX_EL2_FGTnXS_BIT (UL(1) << 4)
+#define HCRX_EL2_FnXS_BIT (UL(1) << 3)
+#define HCRX_EL2_EnASR_BIT (UL(1) << 2)
+#define HCRX_EL2_EnALS_BIT (UL(1) << 1)
+#define HCRX_EL2_EnAS0_BIT (UL(1) << 0)
+
+/*******************************************************************************
* Definitions for DynamicIQ Shared Unit registers
******************************************************************************/
#define CLUSTERPWRDN_EL1 S3_0_c15_c3_6
diff --git a/include/arch/aarch64/arch_features.h b/include/arch/aarch64/arch_features.h
index dc0b7f3..3ff67e5 100644
--- a/include/arch/aarch64/arch_features.h
+++ b/include/arch/aarch64/arch_features.h
@@ -117,4 +117,10 @@
ID_AA64PFR1_MPAM_FRAC_SHIFT) & ID_AA64PFR1_MPAM_FRAC_MASK));
}
+static inline bool is_feat_hcx_present(void)
+{
+ return (((read_id_aa64mmfr1_el1() >> ID_AA64MMFR1_EL1_HCX_SHIFT) &
+ ID_AA64MMFR1_EL1_HCX_MASK) == ID_AA64MMFR1_EL1_HCX_SUPPORTED);
+}
+
#endif /* ARCH_FEATURES_H */
diff --git a/include/arch/aarch64/arch_helpers.h b/include/arch/aarch64/arch_helpers.h
index a41b325..549ae66 100644
--- a/include/arch/aarch64/arch_helpers.h
+++ b/include/arch/aarch64/arch_helpers.h
@@ -532,6 +532,9 @@
DEFINE_SYSREG_READ_FUNC(rndr)
DEFINE_SYSREG_READ_FUNC(rndrrs)
+/* FEAT_HCX Register */
+DEFINE_RENAME_SYSREG_RW_FUNCS(hcrx_el2, HCRX_EL2)
+
/* DynamIQ Shared Unit power management */
DEFINE_RENAME_SYSREG_RW_FUNCS(clusterpwrdn_el1, CLUSTERPWRDN_EL1)