target/loongarch: Add generic CPU model information

On LoongArch system, CPU model name comes from IOCSR register
LOONGARCH_IOCSR_VENDOR and LOONGARCH_IOCSR_CPUNAME. Its value
can be initialized when CPU is created.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Reviewed-by: Song Gao <gaosong@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>

hw/loongarch/virt.c

@@ -777,7 +777,9 @@ static MemTxResult virt_iocsr_misc_read(void *opaque, hwaddr addr,
     LoongArchVirtMachineState *lvms = LOONGARCH_VIRT_MACHINE(opaque);
     uint64_t ret = 0;
     int features;
+    CPULoongArchState *env;
 
+    env = &LOONGARCH_CPU(first_cpu)->env;
     switch (addr) {
     case VERSION_REG:
         ret = 0x11ULL;
@@ -792,10 +794,10 @@ static MemTxResult virt_iocsr_misc_read(void *opaque, hwaddr addr,
         }
         break;
     case VENDOR_REG:
-        ret = 0x6e6f73676e6f6f4cULL; /* "Loongson" */
+        ret = env->vendor_id;
         break;
     case CPUNAME_REG:
-        ret = 0x303030354133ULL;     /* "3A5000" */
+        ret = env->cpu_id;
         break;
     case MISC_FUNC_REG:
         if (kvm_irqchip_in_kernel()) {

target/loongarch/cpu.c

@@ -287,6 +287,8 @@ static void loongarch_la464_initfn(Object *obj)
     data = FIELD_DP32(data, CPUCFG0, SERID, PRID_SERIES_LA464);
     data = FIELD_DP32(data, CPUCFG0, VENID, PRID_VENDOR_LOONGSON);
     env->cpucfg[0] = data;
+    memccpy((void *)&env->vendor_id, CPU_VENDOR_LOONGSON, 0, 8);
+    memccpy((void *)&env->cpu_id, CPU_MODEL_3A5000, 0, 8);
 
     data = 0;
     data = FIELD_DP32(data, CPUCFG1, ARCH, 2);
@@ -413,6 +415,8 @@ static void loongarch_la132_initfn(Object *obj)
     data = FIELD_DP32(data, CPUCFG0, SERID, PRID_SERIES_LA132);
     data = FIELD_DP32(data, CPUCFG0, VENID, PRID_VENDOR_LOONGSON);
     env->cpucfg[0] = data;
+    memccpy((void *)&env->vendor_id, CPU_VENDOR_LOONGSON, 0, 8);
+    memccpy((void *)&env->cpu_id, CPU_MODEL_1C101, 0, 8);
 
     data = 0;
     data = FIELD_DP32(data, CPUCFG1, ARCH, 1); /* LA32 */

target/loongarch/cpu.h

@@ -307,6 +307,10 @@ typedef struct  LoongArchBT {
     uint32_t ftop;
 } lbt_t;
 
+#define CPU_VENDOR_LOONGSON   "Loongson"
+#define CPU_MODEL_3A5000      "3A5000"
+#define CPU_MODEL_1C101       "1C101"
+
 typedef struct CPUArchState {
     uint64_t gpr[32];
     uint64_t pc;
@@ -318,6 +322,8 @@ typedef struct CPUArchState {
 
     uint32_t cpucfg[21];
     uint32_t pv_features;
+    uint64_t vendor_id;
+    uint64_t cpu_id;
 
     /* LoongArch CSRs */
     uint64_t CSR_CRMD;