Re: [PATCH v5 11/11] target/loongarch: Add loongarch32 cpu la132

[gaosong]

Hi, Jiajie

在 2023/8/9 下午4:26, Jiajie Chen 写道:
> Add la132 as a loongarch32 cpu type and allow virt machine to be used
> with la132 instead of la464.
>
> Due to lack of public documentation of la132, it is currently a
> synthetic loongarch32 cpu model. Details need to be added in the future.
>
> Signed-off-by: Jiajie Chen <c@jia.je>
> ---
>   hw/loongarch/virt.c    |  5 -----
>   target/loongarch/cpu.c | 29 +++++++++++++++++++++++++++++
>   2 files changed, 29 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 bd980790f2..dd1cd7d7d2 100644
> --- a/target/loongarch/cpu.c
> +++ b/target/loongarch/cpu.c
> @@ -439,6 +439,34 @@ 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;
> +
> +    int i;
> +
> +    for (i = 0; i < 21; i++) {
> +        env->cpucfg[i] = 0x0;
> +    }
> +
> +    cpu->dtb_compatible = "loongarch,Loongson-1C103";
> +
> +    uint32_t data = 0;
> +    data = FIELD_DP32(data, CPUCFG1, ARCH, 1); /* LA32 */
> +    data = FIELD_DP32(data, CPUCFG1, PGMMU, 1);
> +    data = FIELD_DP32(data, CPUCFG1, IOCSR, 1);

I confirmed with Shenjinyang that la32 don't support IOCSR instructions.

Thanks.
Song Gao

> +    data = FIELD_DP32(data, CPUCFG1, PALEN, 0x1f); /* 32 bits */
> +    data = FIELD_DP32(data, CPUCFG1, VALEN, 0x1f); /* 32 bits */
> +    data = FIELD_DP32(data, CPUCFG1, UAL, 1);
> +    data = FIELD_DP32(data, CPUCFG1, RI, 0);
> +    data = FIELD_DP32(data, CPUCFG1, EP, 0);
> +    data = FIELD_DP32(data, CPUCFG1, RPLV, 0);
> +    data = FIELD_DP32(data, CPUCFG1, HP, 1);
> +    data = FIELD_DP32(data, CPUCFG1, IOCSR_BRD, 1);
> +    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));
> @@ -778,6 +806,7 @@ static const TypeInfo loongarch_cpu_type_infos[] = {
>           .class_init = loongarch32_cpu_class_init,
>       },
>       DEFINE_LOONGARCH_CPU_TYPE("la464", loongarch_la464_initfn),
> +    DEFINE_LOONGARCH32_CPU_TYPE("la132", loongarch_la132_initfn),
>   };
>   
>   DEFINE_TYPES(loongarch_cpu_type_infos)