From f4f4173188249d33a3ec4a0c910c168c9181ac9d Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@gmx.de>
Date: Mon, 30 Dec 2024 12:46:47 +0100
Subject: [PATCH] target/hppa: Convert hppa_cpu_init() to ResetHold handler
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hppa_cpu_initfn() is called once when a HPPA CPU instance is
initialized, but it sets fields which should be set each time
a CPU resets. Rename it as a reset handler, having it matching
the ResettablePhases::hold() signature, and register it as
ResettableClass handler.

Since on reset the CPU registers and TLB entries are expected
to be zero, add a memset() call clearing CPUHPPAState up to
the &end_reset_fields marker.

Signed-off-by: Helge Deller <deller@gmx.de>
Co-developed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20241231190620.24442-3-philmd@linaro.org>
---
 target/hppa/cpu.c | 14 ++++++++++++--
 target/hppa/cpu.h |  5 +++++
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/target/hppa/cpu.c b/target/hppa/cpu.c
index 47d0160955..d784bcdd60 100644
--- a/target/hppa/cpu.c
+++ b/target/hppa/cpu.c
@@ -193,13 +193,20 @@ static void hppa_cpu_realizefn(DeviceState *dev, Error **errp)
     tcg_cflags_set(cs, CF_PCREL);
 }
 
-static void hppa_cpu_initfn(Object *obj)
+static void hppa_cpu_reset_hold(Object *obj, ResetType type)
 {
+    HPPACPUClass *scc = HPPA_CPU_GET_CLASS(obj);
     CPUState *cs = CPU(obj);
     HPPACPU *cpu = HPPA_CPU(obj);
     CPUHPPAState *env = &cpu->env;
 
+    if (scc->parent_phases.hold) {
+        scc->parent_phases.hold(obj, type);
+    }
     cs->exception_index = -1;
+
+    memset(env, 0, offsetof(CPUHPPAState, end_reset_fields));
+
     cpu_hppa_loaded_fr0(env);
     cpu_hppa_put_psw(env, PSW_W);
 }
@@ -242,10 +249,14 @@ static void hppa_cpu_class_init(ObjectClass *oc, void *data)
     DeviceClass *dc = DEVICE_CLASS(oc);
     CPUClass *cc = CPU_CLASS(oc);
     HPPACPUClass *acc = HPPA_CPU_CLASS(oc);
+    ResettableClass *rc = RESETTABLE_CLASS(oc);
 
     device_class_set_parent_realize(dc, hppa_cpu_realizefn,
                                     &acc->parent_realize);
 
+    resettable_class_set_parent_phases(rc, NULL, hppa_cpu_reset_hold, NULL,
+                                       &acc->parent_phases);
+
     cc->class_by_name = hppa_cpu_class_by_name;
     cc->has_work = hppa_cpu_has_work;
     cc->mmu_index = hppa_cpu_mmu_index;
@@ -269,7 +280,6 @@ static const TypeInfo hppa_cpu_type_infos[] = {
         .parent = TYPE_CPU,
         .instance_size = sizeof(HPPACPU),
         .instance_align = __alignof(HPPACPU),
-        .instance_init = hppa_cpu_initfn,
         .abstract = false,
         .class_size = sizeof(HPPACPUClass),
         .class_init = hppa_cpu_class_init,
diff --git a/target/hppa/cpu.h b/target/hppa/cpu.h
index 22a6510e08..c1d69c1a83 100644
--- a/target/hppa/cpu.h
+++ b/target/hppa/cpu.h
@@ -263,6 +263,9 @@ typedef struct CPUArchState {
     IntervalTreeRoot tlb_root;
 
     HPPATLBEntry tlb[HPPA_TLB_ENTRIES];
+
+    /* Fields up to this point are cleared by a CPU reset */
+    struct {} end_reset_fields;
 } CPUHPPAState;
 
 /**
@@ -281,6 +284,7 @@ struct ArchCPU {
 /**
  * HPPACPUClass:
  * @parent_realize: The parent class' realize handler.
+ * @parent_phases: The parent class' reset phase handlers.
  *
  * An HPPA CPU model.
  */
@@ -288,6 +292,7 @@ struct HPPACPUClass {
     CPUClass parent_class;
 
     DeviceRealize parent_realize;
+    ResettablePhases parent_phases;
 };
 
 #include "exec/cpu-all.h"
-- 
2.30.2