[PATCH] target/hppa: Add CPU reset method

[Helge Deller <deller@kernel.org>]

Add the missing CPU reset method, which resets all CPU registers and the
TLB to zero. Then the CPU will switch to 32-bit mode (PSW_W bit is not
set) and start execution at address 0xf0000004.

Signed-off-by: Helge Deller <deller@gmx.de>

diff --git a/target/hppa/cpu.c b/target/hppa/cpu.c
index c38439c180..0cc696ccd3 100644
--- a/target/hppa/cpu.c
+++ b/target/hppa/cpu.c
@@ -235,15 +235,39 @@ static const TCGCPUOps hppa_tcg_ops = {
 #endif /* !CONFIG_USER_ONLY */
 };
 
+static void hppa_cpu_reset_hold(Object *obj, ResetType type)
+{
+    HPPACPU *cpu = HPPA_CPU(obj);
+    HPPACPUClass *scc = HPPA_CPU_GET_CLASS(cpu);
+    CPUHPPAState *env = &cpu->env;
+    CPUState *cs = CPU(cpu);
+
+    if (scc->parent_phases.hold) {
+        scc->parent_phases.hold(obj, type);
+    }
+
+    memset(env, 0, sizeof(*env));
+
+    cpu_set_pc(cs, 0xf0000004);
+    env->psw = PSW_Q;
+
+    cs->exception_index = -1;
+    cs->halted = 0;
+}
+
 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;
diff --git a/target/hppa/cpu.h b/target/hppa/cpu.h
index e45ba50a59..44ee115139 100644
--- a/target/hppa/cpu.h
+++ b/target/hppa/cpu.h
@@ -281,6 +281,7 @@ struct ArchCPU {
 /**
  * HPPACPUClass:
  * @parent_realize: The parent class' realize handler.
+ * @parent_phases: The parent class' reset phase handlers.
  *
  * An HPPA CPU model.
  */
@@ -288,6 +289,7 @@ struct HPPACPUClass {
     CPUClass parent_class;
 
     DeviceRealize parent_realize;
+    ResettablePhases parent_phases;
 };
 
 #include "exec/cpu-all.h"