m1n1: hv: Use Apple implementation specific ACTLR_EL12 on M1*

Fixes: 99571e5 ("hv: Use architectural ACTLR_EL12 on M2+")
Signed-off-by: Janne Grunau <[email protected]>

Author: jannau

proxyclient/m1n1/hv/__init__.py

@@ -1441,9 +1441,13 @@ def init(self):
 
         self.map_vuart()
 
-        actlr = ACTLR(self.u.mrs(ACTLR_EL12))
+        # ACTLR depends on the CPU part
+        part = MIDR(self.u.mrs(MIDR_EL1)).PART
+        actlr_el12 = ACTLR_EL12 if part >= MIDR_PART.T8110_BLIZZARD else ACTLR_EL12_PRE
+
+        actlr = ACTLR(self.u.mrs(actlr_el12))
         actlr.EnMDSB = 1
-        self.u.msr(ACTLR_EL12, actlr.value)
+        self.u.msr(actlr_el12, actlr.value)
 
         self.setup_adt()
 

proxyclient/m1n1/sysreg.py

@@ -379,5 +379,13 @@ class TLBI_RVA(Register64):
     TTL = 38, 37
     BaseADDR = 36, 0
 
+class MIDR_PART(IntEnum):
+    T8110_BLIZZARD = 0x30
+
+class MIDR(Register64):
+    REV_LOW = 3, 0
+    PART = 15, 4
+    REV_HIGH = 23, 20
+
 __all__.extend(k for k, v in globals().items()
                if (callable(v) or isinstance(v, type)) and v.__module__ == __name__)