[Qemu-devel] [PATCH RFC v2 5/8] target-arm: Introduce QOM CPU and use it for CPUID lookup

["Andreas Färber" <afaerber@suse.de>]

Create a CPU subclass, and register classes matching all CPU models.
Don't name the file target-arm/cpu.c so that the user emulators can
still easily pick up the base class in hw/cpu.c via VPATH.

Make arm_cpu_list() enumerate CPU subclasses.

Replace cpu_arm_find_by_name()'s string -> CPUID lookup by storing the
CPUID in the class.
NB: CPUIDs were first introduced by Paul Brook in r1765 (2006).

Signed-off-by: Andreas Färber <afaerber@suse.de>
Cc: Anthony Liguori <anthony@codemonkey.ws>
Cc: Paul Brook <paul@codesourcery.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
---
 Makefile.target       |    1 +
 target-arm/cpu-core.c |  181 +++++++++++++++++++++++++++++++++++++++++++++++++
 target-arm/cpu-core.h |   45 ++++++++++++
 target-arm/helper.c   |   80 ++++++----------------
 4 files changed, 249 insertions(+), 58 deletions(-)
 create mode 100644 target-arm/cpu-core.c
 create mode 100644 target-arm/cpu-core.h

diff --git a/Makefile.target b/Makefile.target
index 5d3470e..96043c4 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -80,6 +80,7 @@ endif
 libobj-$(TARGET_SPARC64) += vis_helper.o
 libobj-$(CONFIG_NEED_MMU) += mmu.o
 libobj-$(TARGET_ARM) += neon_helper.o iwmmxt_helper.o
+libobj-$(TARGET_ARM) += cpu-core.o
 ifeq ($(TARGET_BASE_ARCH), sparc)
 libobj-y += fop_helper.o cc_helper.o win_helper.o mmu_helper.o ldst_helper.o
 libobj-y += cpu_init.o
diff --git a/target-arm/cpu-core.c b/target-arm/cpu-core.c
new file mode 100644
index 0000000..b255741
--- /dev/null
+++ b/target-arm/cpu-core.c
@@ -0,0 +1,181 @@
+/*
+ * QEMU ARM CPU core
+ *
+ * Copyright (c) 2012 SUSE LINUX Products GmbH
+ *
+ * Licensed under the terms of the GNU GPL version 2
+ * or (at your option) any later version.
+ */
+
+#include "cpu-core.h"
+#include "qemu-common.h"
+
+static void arm_cpu_reset(CPU *c)
+{
+    cpu_common_reset(c);
+}
+
+/* CPU models */
+
+typedef struct ARMCPUInfo {
+    const char *name;
+    const char *alias;
+    uint32_t id;
+} ARMCPUInfo;
+
+static const ARMCPUInfo arm_cpus[] = {
+    {
+        .name = "arm926",
+        .id = 0x41069265,
+    },
+    {
+        .name = "arm946",
+        .id = 0x41059461,
+    },
+    {
+        .name = "arm1026",
+        .id = 0x4106a262,
+    },
+    /* What QEMU calls "arm1136-r2" is actually the 1136 r0p2, i.e. an
+     * older core than plain "arm1136". In particular this does not
+     * have the v6K features.
+     */
+    {
+        .name = "arm1136-r2",
+        .id = 0x4107b362,
+    },
+    {
+        .name = "arm1136",
+        .id = 0x4117b363,
+    },
+    {
+        .name = "arm1176",
+        .id = 0x410fb767,
+    },
+    {
+        .name = "arm11mpcore",
+        .id = 0x410fb022,
+    },
+    {
+        .name = "cortex-m3",
+        .id = 0x410fc231,
+    },
+    {
+        .name = "cortex-a8",
+        .id = 0x410fc080,
+    },
+    {
+        .name = "cortex-a9",
+        .id = 0x410fc090,
+    },
+    {
+        .name = "cortex-a15",
+        .id = 0x412fc0f1,
+    },
+    {
+        .name = "ti925t",
+        .id = 0x54029252,
+    },
+    {
+        .name = "sa1100",
+        .id = 0x4401A11B,
+    },
+    {
+        .name = "sa1110",
+        .id = 0x6901B119,
+    },
+    {
+        .name = "pxa250",
+        .id = 0x69052100,
+    },
+    {
+        .name = "pxa255",
+        .id = 0x69052d00,
+    },
+    {
+        .name = "pxa260",
+        .id = 0x69052903,
+    },
+    {
+        .name = "pxa261",
+        .id = 0x69052d05,
+    },
+    {
+        .name = "pxa262",
+        .id = 0x69052d06,
+    },
+    {
+        .name = "pxa270-a0",
+        .alias = "pxa270",
+        .id = 0x69054110,
+    },
+    {
+        .name = "pxa270-a1",
+        .id = 0x69054111,
+    },
+    {
+        .name = "pxa270-b0",
+        .id = 0x69054112,
+    },
+    {
+        .name = "pxa270-b1",
+        .id = 0x69054113,
+    },
+    {
+        .name = "pxa270-c0",
+        .id = 0x69054114,
+    },
+    {
+        .name = "pxa270-c5",
+        .id = 0x69054117,
+    },
+    {
+        .name = "any",
+        .id = 0xffffffff,
+    },
+};
+
+static void arm_cpu_class_init(ObjectClass *klass, void *data)
+{
+    ARMCPUClass *k = ARM_CPU_CLASS(klass);
+    CPUClass *cpu_class = CPU_CLASS(klass);
+    const ARMCPUInfo *info = data;
+
+    cpu_class->reset = arm_cpu_reset;
+
+    k->id = info->id;
+}
+
+static void cpu_register(const ARMCPUInfo *info)
+{
+    TypeInfo type = {
+        .name = info->name,
+        .parent = TYPE_ARM_CPU,
+        .instance_size = sizeof(ARMCPU),
+        .class_size = sizeof(ARMCPUClass),
+        .class_init = arm_cpu_class_init,
+        .class_data = (void *)info,
+    };
+
+    type_register_static(&type);
+}
+
+static TypeInfo arm_cpu_type_info = {
+    .name = TYPE_ARM_CPU,
+    .parent = TYPE_CPU,
+    .instance_size = sizeof(ARMCPU),
+    .abstract = true,
+    .class_size = sizeof(ARMCPUClass),
+};
+
+static void arm_cpu_types_init(void)
+{
+    int i;
+
+    type_register_static(&arm_cpu_type_info);
+    for (i = 0; i < ARRAY_SIZE(arm_cpus); i++) {
+        cpu_register(&arm_cpus[i]);
+    }
+}
+
+type_init(arm_cpu_types_init)
diff --git a/target-arm/cpu-core.h b/target-arm/cpu-core.h
new file mode 100644
index 0000000..ccc5503
--- /dev/null
+++ b/target-arm/cpu-core.h
@@ -0,0 +1,45 @@
+/*
+ * QEMU ARM CPU core
+ *
+ * Copyright (c) 2012 SUSE LINUX Products GmbH
+ *
+ * Licensed under the terms of the GNU GPL version 2
+ * or (at your option) any later version.
+ */
+#ifndef QEMU_ARM_CPU_CORE_H
+#define QEMU_ARM_CPU_CORE_H
+
+#include "qemu/cpu.h"
+
+#define TYPE_ARM_CPU "arm-cpu"
+
+#define ARM_CPU_CLASS(klass) \
+    OBJECT_CLASS_CHECK(ARMCPUClass, (klass), TYPE_ARM_CPU)
+#define ARM_CPU(obj) \
+    OBJECT_CHECK(ARMCPU, (obj), TYPE_ARM_CPU)
+#define ARM_CPU_GET_CLASS(obj) \
+    OBJECT_GET_CLASS(ARMCPUClass, (obj), TYPE_ARM_CPU)
+
+/**
+ * ARMCPUClass:
+ * @id: CPUID value.
+ *
+ * An ARM CPU model.
+ */
+typedef struct ARMCPUClass {
+    CPUClass parent_class;
+
+    uint32_t id;
+} ARMCPUClass;
+
+/**
+ * ARMCPU:
+ *
+ * An ARM CPU core.
+ */
+typedef struct ARMCPU {
+    CPU parent_obj;
+} ARMCPU;
+
+
+#endif
diff --git a/target-arm/helper.c b/target-arm/helper.c
index ea4f35f..3f34d8d 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -11,6 +11,7 @@
 #include "hw/loader.h"
 #endif
 #include "sysemu.h"
+#include "cpu-core.h"
 
 static uint32_t cortexa15_cp15_c0_c1[8] = {
     0x00001131, 0x00011011, 0x02010555, 0x00000000,
@@ -51,8 +52,6 @@ static uint32_t arm1176_cp15_c0_c1[8] =
 static uint32_t arm1176_cp15_c0_c2[8] =
 { 0x0140011, 0x12002111, 0x11231121, 0x01102131, 0x01141, 0, 0, 0 };
 
-static uint32_t cpu_arm_find_by_name(const char *name);
-
 static inline void set_feature(CPUARMState *env, int feature)
 {
     env->features |= 1u << feature;
@@ -400,13 +399,16 @@ static int vfp_gdb_set_reg(CPUState *env, uint8_t *buf, int reg)
 
 CPUARMState *cpu_arm_init(const char *cpu_model)
 {
+    ObjectClass *klass;
+    ARMCPUClass *cpu_class;
     CPUARMState *env;
-    uint32_t id;
     static int inited = 0;
 
-    id = cpu_arm_find_by_name(cpu_model);
-    if (id == 0)
+    klass = object_class_by_name(cpu_model);
+    if (klass == NULL) {
         return NULL;
+    }
+    cpu_class = ARM_CPU_CLASS(klass);
     env = g_malloc0(sizeof(CPUARMState));
     cpu_exec_init(env);
     if (tcg_enabled() && !inited) {
@@ -415,7 +417,7 @@ CPUARMState *cpu_arm_init(const char *cpu_model)
     }
 
     env->cpu_model_str = cpu_model;
-    env->cp15.c0_cpuid = id;
+    env->cp15.c0_cpuid = cpu_class->id;
     cpu_reset(env);
     if (arm_feature(env, ARM_FEATURE_NEON)) {
         gdb_register_coprocessor(env, vfp_gdb_get_reg, vfp_gdb_set_reg,
@@ -431,66 +433,28 @@ CPUARMState *cpu_arm_init(const char *cpu_model)
     return env;
 }
 
-struct arm_cpu_t {
-    uint32_t id;
-    const char *name;
+struct ARMCPUListState {
+    fprintf_function cpu_fprintf;
+    FILE *file;
 };
 
-static const struct arm_cpu_t arm_cpu_names[] = {
-    { ARM_CPUID_ARM926, "arm926"},
-    { ARM_CPUID_ARM946, "arm946"},
-    { ARM_CPUID_ARM1026, "arm1026"},
-    { ARM_CPUID_ARM1136, "arm1136"},
-    { ARM_CPUID_ARM1136_R2, "arm1136-r2"},
-    { ARM_CPUID_ARM1176, "arm1176"},
-    { ARM_CPUID_ARM11MPCORE, "arm11mpcore"},
-    { ARM_CPUID_CORTEXM3, "cortex-m3"},
-    { ARM_CPUID_CORTEXA8, "cortex-a8"},
-    { ARM_CPUID_CORTEXA9, "cortex-a9"},
-    { ARM_CPUID_CORTEXA15, "cortex-a15" },
-    { ARM_CPUID_TI925T, "ti925t" },
-    { ARM_CPUID_PXA250, "pxa250" },
-    { ARM_CPUID_SA1100,    "sa1100" },
-    { ARM_CPUID_SA1110,    "sa1110" },
-    { ARM_CPUID_PXA255, "pxa255" },
-    { ARM_CPUID_PXA260, "pxa260" },
-    { ARM_CPUID_PXA261, "pxa261" },
-    { ARM_CPUID_PXA262, "pxa262" },
-    { ARM_CPUID_PXA270, "pxa270" },
-    { ARM_CPUID_PXA270_A0, "pxa270-a0" },
-    { ARM_CPUID_PXA270_A1, "pxa270-a1" },
-    { ARM_CPUID_PXA270_B0, "pxa270-b0" },
-    { ARM_CPUID_PXA270_B1, "pxa270-b1" },
-    { ARM_CPUID_PXA270_C0, "pxa270-c0" },
-    { ARM_CPUID_PXA270_C5, "pxa270-c5" },
-    { ARM_CPUID_ANY, "any"},
-    { 0, NULL}
-};
-
-void arm_cpu_list(FILE *f, fprintf_function cpu_fprintf)
+static void arm_cpu_list_entry(ObjectClass *klass, void *opaque)
 {
-    int i;
+    struct ARMCPUListState *s = opaque;
 
-    (*cpu_fprintf)(f, "Available CPUs:\n");
-    for (i = 0; arm_cpu_names[i].name; i++) {
-        (*cpu_fprintf)(f, "  %s\n", arm_cpu_names[i].name);
-    }
+    (*s->cpu_fprintf)(s->file, "  %s\n",
+                      object_class_get_name(klass));
 }
 
-/* return 0 if not found */
-static uint32_t cpu_arm_find_by_name(const char *name)
+void arm_cpu_list(FILE *f, fprintf_function cpu_fprintf)
 {
-    int i;
-    uint32_t id;
+    struct ARMCPUListState s = {
+        .cpu_fprintf = cpu_fprintf,
+        .file = f,
+    };
 
-    id = 0;
-    for (i = 0; arm_cpu_names[i].name; i++) {
-        if (strcmp(name, arm_cpu_names[i].name) == 0) {
-            id = arm_cpu_names[i].id;
-            break;
-        }
-    }
-    return id;
+    (*cpu_fprintf)(f, "Available CPUs:\n");
+    object_class_foreach(arm_cpu_list_entry, TYPE_CPU, false, &s);
 }
 
 void cpu_arm_close(CPUARMState *env)
-- 
1.7.7