[PATCH v3 41/52] xen/mpu: Use secure hypervisor timer in MPU system

[Penny Zheng <Penny.Zheng@xxxxxxx>]

As MPU system only has one secure state, we have to use secure EL2 hypervisor
timer for Xen in secure EL2.

In this patch, we introduce a new Kconfig option ARM_SECURE_STATE and
a set of secure hypervisor timer registers CNTHPS_*_EL2.
We alias CNTHP_*_EL2 to CNTHPS_*_EL2 to keep the timer code flow unchanged.

Signed-off-by: Penny Zheng <penny.zheng@xxxxxxx>
Signed-off-by: Wei Chen <wei.chen@xxxxxxx>
---
v3:
- alias CNTHP_*_EL2 to CNTHPS_*_EL2 to avoid renaming
---
 xen/arch/arm/Kconfig                     |  4 ++++
 xen/arch/arm/include/asm/arm64/sysregs.h | 15 +++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/xen/arch/arm/Kconfig b/xen/arch/arm/Kconfig
index b2710c1c31..3f67aacbbf 100644
--- a/xen/arch/arm/Kconfig
+++ b/xen/arch/arm/Kconfig
@@ -92,6 +92,10 @@ config ARM_EFI
          UEFI firmware. A UEFI stub is provided to allow Xen to
          be booted as an EFI application.
 
+config ARM_SECURE_STATE
+       bool "Xen will run in Arm Secure State"
+       default n
+
 config GICV3
        bool "GICv3 driver"
        depends on !NEW_VGIC
diff --git a/xen/arch/arm/include/asm/arm64/sysregs.h 
b/xen/arch/arm/include/asm/arm64/sysregs.h
index 96c025053b..ab0e6a97d3 100644
--- a/xen/arch/arm/include/asm/arm64/sysregs.h
+++ b/xen/arch/arm/include/asm/arm64/sysregs.h
@@ -514,6 +514,21 @@
 
 #endif
 
+#ifdef CONFIG_ARM_SECURE_STATE
+/*
+ * The Armv8-R AArch64 architecture always executes code in Secure
+ * state with EL2 as the highest Exception.
+ *
+ * Hypervisor timer registers for Secure EL2.
+ */
+#define CNTHPS_TVAL_EL2  S3_4_C14_C5_0
+#define CNTHPS_CTL_EL2   S3_4_C14_C5_1
+#define CNTHPS_CVAL_EL2  S3_4_C14_C5_2
+#define CNTHP_TVAL_EL2  CNTHPS_TVAL_EL2
+#define CNTHP_CTL_EL2   CNTHPS_CTL_EL2
+#define CNTHP_CVAL_EL2  CNTHPS_CVAL_EL2
+#endif
+
 /* Access to system registers */
 
 #define WRITE_SYSREG64(v, name) do {                    \
-- 
2.25.1