From b97e5a6b0a93f8e8b83c18c89c4c408fb7ae7cb0 Mon Sep 17 00:00:00 2001 From: Daniel Henrique Barboza Date: Tue, 12 Sep 2023 10:24:13 -0300 Subject: [PATCH] target/riscv: add 'max' CPU type The 'max' CPU type is used by tooling to determine what's the most capable CPU a current QEMU version implements. Other archs such as ARM implements this type. Let's add it to RISC-V. What we consider "most capable CPU" in this context are related to ratified, non-vendor extensions. This means that we want the 'max' CPU to enable all (possible) ratified extensions by default. The reasoning behind this design is (1) vendor extensions can conflict with each other and we won't play favorities deciding which one is default or not and (2) non-ratified extensions are always prone to changes, not being stable enough to be enabled by default. All this said, we're still not able to enable all ratified extensions due to conflicts between them. Zfinx and all its dependencies aren't enabled because of a conflict with RVF. zce, zcmp and zcmt are also disabled due to RVD conflicts. When running with 64 bits we're also disabling zcf. MISA bits RVG, RVJ and RVV are also being set manually since they're default disabled. This is the resulting 'riscv,isa' DT for this new CPU: rv64imafdcvh_zicbom_zicboz_zicsr_zifencei_zihintpause_zawrs_zfa_ zfh_zfhmin_zca_zcb_zcd_zba_zbb_zbc_zbkb_zbkc_zbkx_zbs_zk_zkn_zknd_ zkne_zknh_zkr_zks_zksed_zksh_zkt_zve32f_zve64f_zve64d_ smstateen_sscofpmf_sstc_svadu_svinval_svnapot_svpbmt Signed-off-by: Daniel Henrique Barboza Reviewed-by: Weiwei Li Reviewed-by: Alistair Francis Reviewed-by: Andrew Jones Message-ID: <20230912132423.268494-11-dbarboza@ventanamicro.com> Signed-off-by: Alistair Francis --- target/riscv/cpu-qom.h | 1 + target/riscv/cpu.c | 56 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 57 insertions(+) diff --git a/target/riscv/cpu-qom.h b/target/riscv/cpu-qom.h index 04af50983e..f3fbe37a2c 100644 --- a/target/riscv/cpu-qom.h +++ b/target/riscv/cpu-qom.h @@ -30,6 +30,7 @@ #define CPU_RESOLVING_TYPE TYPE_RISCV_CPU #define TYPE_RISCV_CPU_ANY RISCV_CPU_TYPE_NAME("any") +#define TYPE_RISCV_CPU_MAX RISCV_CPU_TYPE_NAME("max") #define TYPE_RISCV_CPU_BASE32 RISCV_CPU_TYPE_NAME("rv32") #define TYPE_RISCV_CPU_BASE64 RISCV_CPU_TYPE_NAME("rv64") #define TYPE_RISCV_CPU_BASE128 RISCV_CPU_TYPE_NAME("x-rv128") diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c index 7b9d0c7e52..c9de7ddb4e 100644 --- a/target/riscv/cpu.c +++ b/target/riscv/cpu.c @@ -259,6 +259,7 @@ static const char * const riscv_intr_names[] = { }; static void riscv_cpu_add_user_properties(Object *obj); +static void riscv_init_max_cpu_extensions(Object *obj); const char *riscv_cpu_get_trap_name(target_ulong cause, bool async) { @@ -396,6 +397,25 @@ static void riscv_any_cpu_init(Object *obj) cpu->cfg.pmp = true; } +static void riscv_max_cpu_init(Object *obj) +{ + RISCVCPU *cpu = RISCV_CPU(obj); + CPURISCVState *env = &cpu->env; + RISCVMXL mlx = MXL_RV64; + +#ifdef TARGET_RISCV32 + mlx = MXL_RV32; +#endif + set_misa(env, mlx, 0); + riscv_cpu_add_user_properties(obj); + riscv_init_max_cpu_extensions(obj); + env->priv_ver = PRIV_VERSION_LATEST; +#ifndef CONFIG_USER_ONLY + set_satp_mode_max_supported(RISCV_CPU(obj), mlx == MXL_RV32 ? + VM_1_10_SV32 : VM_1_10_SV57); +#endif +} + #if defined(TARGET_RISCV64) static void rv64_base_cpu_init(Object *obj) { @@ -2030,6 +2050,41 @@ static void riscv_cpu_add_user_properties(Object *obj) riscv_cpu_add_qdev_prop_array(dev, riscv_cpu_experimental_exts); } +/* + * The 'max' type CPU will have all possible ratified + * non-vendor extensions enabled. + */ +static void riscv_init_max_cpu_extensions(Object *obj) +{ + RISCVCPU *cpu = RISCV_CPU(obj); + CPURISCVState *env = &cpu->env; + Property *prop; + + /* Enable RVG, RVJ and RVV that are disabled by default */ + set_misa(env, env->misa_mxl, env->misa_ext | RVG | RVJ | RVV); + + for (prop = riscv_cpu_extensions; prop && prop->name; prop++) { + object_property_set_bool(obj, prop->name, true, NULL); + } + + /* set vector version */ + env->vext_ver = VEXT_VERSION_1_00_0; + + /* Zfinx is not compatible with F. Disable it */ + object_property_set_bool(obj, "zfinx", false, NULL); + object_property_set_bool(obj, "zdinx", false, NULL); + object_property_set_bool(obj, "zhinx", false, NULL); + object_property_set_bool(obj, "zhinxmin", false, NULL); + + object_property_set_bool(obj, "zce", false, NULL); + object_property_set_bool(obj, "zcmp", false, NULL); + object_property_set_bool(obj, "zcmt", false, NULL); + + if (env->misa_mxl != MXL_RV32) { + object_property_set_bool(obj, "zcf", false, NULL); + } +} + static Property riscv_cpu_properties[] = { DEFINE_PROP_BOOL("debug", RISCVCPU, cfg.debug, true), @@ -2368,6 +2423,7 @@ static const TypeInfo riscv_cpu_type_infos[] = { .abstract = true, }, DEFINE_DYNAMIC_CPU(TYPE_RISCV_CPU_ANY, riscv_any_cpu_init), + DEFINE_DYNAMIC_CPU(TYPE_RISCV_CPU_MAX, riscv_max_cpu_init), #if defined(CONFIG_KVM) DEFINE_CPU(TYPE_RISCV_CPU_HOST, riscv_host_cpu_init), #endif