[RFC v2 09/12] i386: Introduce x86 CPU core abstractions

[Zhao Liu]

Abstract 3 core types for i386: common core, Intel Core (P-core) and
Intel atom (E-core). This is in preparation for creating the hybrid
topology from the CLI.

Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
---
 target/i386/core.c      | 56 +++++++++++++++++++++++++++++++++++++++++
 target/i386/core.h      | 53 ++++++++++++++++++++++++++++++++++++++
 target/i386/meson.build |  1 +
 3 files changed, 110 insertions(+)
 create mode 100644 target/i386/core.c
 create mode 100644 target/i386/core.h

diff --git a/target/i386/core.c b/target/i386/core.c
new file mode 100644
index 000000000000..d76186a6a070
--- /dev/null
+++ b/target/i386/core.c
@@ -0,0 +1,56 @@
+/*
+ * x86 CPU core
+ *
+ * Copyright (C) 2024 Intel Corporation.
+ *
+ * Author: Zhao Liu <zhao1.liu@intel.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * later.  See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "core.h"
+
+static void x86_common_core_class_init(ObjectClass *oc, void *data)
+{
+    X86CPUCoreClass *cc = X86_CPU_CORE_CLASS(oc);
+
+    cc->core_type = COMMON_CORE;
+}
+
+static void x86_intel_atom_class_init(ObjectClass *oc, void *data)
+{
+    X86CPUCoreClass *cc = X86_CPU_CORE_CLASS(oc);
+
+    cc->core_type = INTEL_ATOM;
+}
+
+static void x86_intel_core_class_init(ObjectClass *oc, void *data)
+{
+    X86CPUCoreClass *cc = X86_CPU_CORE_CLASS(oc);
+
+    cc->core_type = INTEL_CORE;
+}
+
+static const TypeInfo x86_cpu_core_infos[] = {
+    {
+        .name = TYPE_X86_CPU_CORE,
+        .parent = TYPE_CPU_CORE,
+        .class_size = sizeof(X86CPUCoreClass),
+        .class_init = x86_common_core_class_init,
+        .instance_size = sizeof(X86CPUCore),
+    },
+    {
+        .parent = TYPE_X86_CPU_CORE,
+        .name = X86_CPU_CORE_TYPE_NAME("intel-atom"),
+        .class_init = x86_intel_atom_class_init,
+    },
+    {
+        .parent = TYPE_X86_CPU_CORE,
+        .name = X86_CPU_CORE_TYPE_NAME("intel-core"),
+        .class_init = x86_intel_core_class_init,
+    },
+};
+
+DEFINE_TYPES(x86_cpu_core_infos)
diff --git a/target/i386/core.h b/target/i386/core.h
new file mode 100644
index 000000000000..b942153b2c0d
--- /dev/null
+++ b/target/i386/core.h
@@ -0,0 +1,53 @@
+/*
+ * x86 CPU core header
+ *
+ * Copyright (C) 2024 Intel Corporation.
+ *
+ * Author: Zhao Liu <zhao1.liu@intel.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * later.  See the COPYING file in the top-level directory.
+ */
+
+#include "hw/cpu/core.h"
+#include "hw/cpu/cpu-topology.h"
+#include "qom/object.h"
+
+#ifndef I386_CORE_H
+#define I386_CORE_H
+
+#ifdef TARGET_X86_64
+#define TYPE_X86_PREFIX "x86-"
+#else
+#define TYPE_X86_PREFIX "i386-"
+#endif
+
+#define TYPE_X86_CPU_CORE TYPE_X86_PREFIX "core"
+
+OBJECT_DECLARE_TYPE(X86CPUCore, X86CPUCoreClass, X86_CPU_CORE)
+
+typedef enum {
+    COMMON_CORE = 0,
+    INTEL_ATOM,
+    INTEL_CORE,
+} X86CoreType;
+
+struct X86CPUCoreClass {
+    /*< private >*/
+    CPUTopoClass parent_class;
+
+    /*< public >*/
+    DeviceRealize parent_realize;
+    X86CoreType core_type;
+};
+
+struct X86CPUCore {
+    /*< private >*/
+    CPUCore parent_obj;
+
+    /*< public >*/
+};
+
+#define X86_CPU_CORE_TYPE_NAME(core_type_str) (TYPE_X86_PREFIX core_type_str)
+
+#endif /* I386_CORE_H */
diff --git a/target/i386/meson.build b/target/i386/meson.build
index 075117989b9d..80a32526d98b 100644
--- a/target/i386/meson.build
+++ b/target/i386/meson.build
@@ -18,6 +18,7 @@ i386_system_ss.add(files(
   'arch_memory_mapping.c',
   'machine.c',
   'monitor.c',
+  'core.c',
   'cpu-apic.c',
   'cpu-sysemu.c',
 ))
-- 
2.34.1