1 files changed, 34 insertions, 0 deletions
diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index 325b737d26..7938ddc91c 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -515,6 +515,13 @@ typedef struct CPUARMState {
 } CPUARMState;
 
 /**
+ * ARMELChangeHook:
+ * type of a function which can be registered via arm_register_el_change_hook()
+ * to get callbacks when the CPU changes its exception level or mode.
+ */
+typedef void ARMELChangeHook(ARMCPU *cpu, void *opaque);
+
+/**
  * ARMCPU:
  * @env: #CPUARMState
  *
@@ -654,6 +661,9 @@ struct ARMCPU {
     /* DCZ blocksize, in log_2(words), ie low 4 bits of DCZID_EL0 */
     uint32_t dcz_blocksize;
     uint64_t rvbar;
+
+    ARMELChangeHook *el_change_hook;
+    void *el_change_hook_opaque;
 };
 
 static inline ARMCPU *arm_env_get_cpu(CPUARMState *env)
@@ -2386,4 +2396,28 @@ static inline AddressSpace *arm_addressspace(CPUState *cs, MemTxAttrs attrs)
 }
 #endif
 
+/**
+ * arm_register_el_change_hook:
+ * Register a hook function which will be called back whenever this
+ * CPU changes exception level or mode. The hook function will be
+ * passed a pointer to the ARMCPU and the opaque data pointer passed
+ * to this function when the hook was registered.
+ *
+ * Note that we currently only support registering a single hook function,
+ * and will assert if this function is called twice.
+ * This facility is intended for the use of the GICv3 emulation.
+ */
+void arm_register_el_change_hook(ARMCPU *cpu, ARMELChangeHook *hook,
+                                 void *opaque);
+
+/**
+ * arm_get_el_change_hook_opaque:
+ * Return the opaque data that will be used by the el_change_hook
+ * for this CPU.
+ */
+static inline void *arm_get_el_change_hook_opaque(ARMCPU *cpu)
+{
+    return cpu->el_change_hook_opaque;
+}
+
 #endif