[PATCH v3 2/6] target/loongarch: Add loongarch32 cpu la132

[Jiajie Chen <c@jia.je>]

Add la132 as a loongarch32 cpu type and allow virt machine to be used
with la132 instead of la464.

Signed-off-by: Jiajie Chen <c@jia.je>
---
 hw/loongarch/virt.c    |  5 -----
 target/loongarch/cpu.c | 41 +++++++++++++++++++++++++++++++++++++++++
 target/loongarch/cpu.h | 11 +++++++++++
 3 files changed, 52 insertions(+), 5 deletions(-)

diff --git a/hw/loongarch/virt.c b/hw/loongarch/virt.c
index e19b042ce8..af15bf5aaa 100644
--- a/hw/loongarch/virt.c
+++ b/hw/loongarch/virt.c
@@ -798,11 +798,6 @@ static void loongarch_init(MachineState *machine)
         cpu_model = LOONGARCH_CPU_TYPE_NAME("la464");
     }
 
-    if (!strstr(cpu_model, "la464")) {
-        error_report("LoongArch/TCG needs cpu type la464");
-        exit(1);
-    }
-
     if (ram_size < 1 * GiB) {
         error_report("ram_size must be greater than 1G.");
         exit(1);
diff --git a/target/loongarch/cpu.c b/target/loongarch/cpu.c
index ad93ecac92..d31efe86da 100644
--- a/target/loongarch/cpu.c
+++ b/target/loongarch/cpu.c
@@ -362,6 +362,8 @@ static void loongarch_la464_initfn(Object *obj)
     CPULoongArchState *env = &cpu->env;
     int i;
 
+    env->mode = LA64;
+
     for (i = 0; i < 21; i++) {
         env->cpucfg[i] = 0x0;
     }
@@ -439,6 +441,20 @@ static void loongarch_la464_initfn(Object *obj)
     env->CSR_ASID = FIELD_DP64(0, CSR_ASID, ASIDBITS, 0xa);
 }
 
+static void loongarch_la132_initfn(Object *obj)
+{
+    LoongArchCPU *cpu = LOONGARCH_CPU(obj);
+    CPULoongArchState *env = &cpu->env;
+
+    env->mode = LA32;
+
+    cpu->dtb_compatible = "loongarch,Loongson-3C103";
+
+    uint32_t data = 0;
+    data = FIELD_DP32(data, CPUCFG1, ARCH, 1); /* LA32 */
+    env->cpucfg[1] = data;
+}
+
 static void loongarch_cpu_list_entry(gpointer data, gpointer user_data)
 {
     const char *typename = object_class_get_name(OBJECT_CLASS(data));
@@ -732,6 +748,10 @@ static void loongarch_cpu_class_init(ObjectClass *c, void *data)
 #endif
 }
 
+static void loongarch32_cpu_class_init(ObjectClass *c, void *data)
+{
+}
+
 #define DEFINE_LOONGARCH_CPU_TYPE(model, initfn) \
     { \
         .parent = TYPE_LOONGARCH_CPU, \
@@ -754,3 +774,24 @@ static const TypeInfo loongarch_cpu_type_infos[] = {
 };
 
 DEFINE_TYPES(loongarch_cpu_type_infos)
+
+#define DEFINE_LOONGARCH32_CPU_TYPE(model, initfn) \
+    { \
+        .parent = TYPE_LOONGARCH32_CPU, \
+        .instance_init = initfn, \
+        .name = LOONGARCH_CPU_TYPE_NAME(model), \
+    }
+
+static const TypeInfo loongarch32_cpu_type_infos[] = {
+    {
+        .name = TYPE_LOONGARCH32_CPU,
+        .parent = TYPE_LOONGARCH_CPU,
+        .instance_size = sizeof(LoongArchCPU),
+
+        .abstract = true,
+        .class_size = sizeof(LoongArchCPUClass),
+        .class_init = loongarch32_cpu_class_init,
+    },
+    DEFINE_LOONGARCH32_CPU_TYPE("la132", loongarch_la132_initfn),
+};
+DEFINE_TYPES(loongarch32_cpu_type_infos)
diff --git a/target/loongarch/cpu.h b/target/loongarch/cpu.h
index 43c73e6363..f1907cddc5 100644
--- a/target/loongarch/cpu.h
+++ b/target/loongarch/cpu.h
@@ -404,6 +404,17 @@ struct LoongArchCPUClass {
     ResettablePhases parent_phases;
 };
 
+#define TYPE_LOONGARCH32_CPU "loongarch32-cpu"
+typedef struct LoongArch32CPUClass LoongArch32CPUClass;
+DECLARE_CLASS_CHECKERS(LoongArch32CPUClass, LOONGARCH32_CPU,
+                       TYPE_LOONGARCH32_CPU)
+
+struct LoongArch32CPUClass {
+    /*< private >*/
+    LoongArchCPUClass parent_class;
+    /*< public >*/
+};
+
 /*
  * LoongArch CPUs has 4 privilege levels.
  * 0 for kernel mode, 3 for user mode.
-- 
2.39.2