target/riscv: add Ventana's Veyron V1 CPU

Add a virtual CPU for Ventana's first CPU named veyron-v1. It runs
exclusively for the rv64 target. It's tested with the 'virt' board.

CPU specs and general information can be found here:

https://www.nextplatform.com/2023/02/02/the-first-risc-v-shot-across-the-datacenter-bow/

Signed-off-by: Rahul Pathak <rpathak@ventanamicro.com>
Signed-off-by: Mayuresh Chitale <mchitale@ventanamicro.com>
Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20230418123624.16414-1-dbarboza@ventanamicro.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

target/riscv/cpu-qom.h

@@ -41,6 +41,7 @@
 #define TYPE_RISCV_CPU_SIFIVE_U34       RISCV_CPU_TYPE_NAME("sifive-u34")
 #define TYPE_RISCV_CPU_SIFIVE_U54       RISCV_CPU_TYPE_NAME("sifive-u54")
 #define TYPE_RISCV_CPU_THEAD_C906       RISCV_CPU_TYPE_NAME("thead-c906")
+#define TYPE_RISCV_CPU_VEYRON_V1        RISCV_CPU_TYPE_NAME("veyron-v1")
 #define TYPE_RISCV_CPU_HOST             RISCV_CPU_TYPE_NAME("host")
 
 #if defined(TARGET_RISCV32)

target/riscv/cpu.c

@@ -422,6 +422,43 @@ static void rv64_thead_c906_cpu_init(Object *obj)
 #endif
 }
 
+static void rv64_veyron_v1_cpu_init(Object *obj)
+{
+    CPURISCVState *env = &RISCV_CPU(obj)->env;
+    RISCVCPU *cpu = RISCV_CPU(obj);
+
+    set_misa(env, MXL_RV64, RVG | RVC | RVS | RVU | RVH);
+    env->priv_ver = PRIV_VERSION_1_12_0;
+
+    /* Enable ISA extensions */
+    cpu->cfg.mmu = true;
+    cpu->cfg.ext_icbom = true;
+    cpu->cfg.cbom_blocksize = 64;
+    cpu->cfg.cboz_blocksize = 64;
+    cpu->cfg.ext_icboz = true;
+    cpu->cfg.ext_smaia = true;
+    cpu->cfg.ext_ssaia = true;
+    cpu->cfg.ext_sscofpmf = true;
+    cpu->cfg.ext_sstc = true;
+    cpu->cfg.ext_svinval = true;
+    cpu->cfg.ext_svnapot = true;
+    cpu->cfg.ext_svpbmt = true;
+    cpu->cfg.ext_smstateen = true;
+    cpu->cfg.ext_zba = true;
+    cpu->cfg.ext_zbb = true;
+    cpu->cfg.ext_zbc = true;
+    cpu->cfg.ext_zbs = true;
+    cpu->cfg.ext_XVentanaCondOps = true;
+
+    cpu->cfg.mvendorid = VEYRON_V1_MVENDORID;
+    cpu->cfg.marchid = VEYRON_V1_MARCHID;
+    cpu->cfg.mimpid = VEYRON_V1_MIMPID;
+
+#ifndef CONFIG_USER_ONLY
+    set_satp_mode_max_supported(cpu, VM_1_10_SV48);
+#endif
+}
+
 static void rv128_base_cpu_init(Object *obj)
 {
     if (qemu_tcg_mttcg_enabled()) {
@@ -1827,6 +1864,7 @@ static const TypeInfo riscv_cpu_type_infos[] = {
     DEFINE_CPU(TYPE_RISCV_CPU_SIFIVE_U54,       rv64_sifive_u_cpu_init),
     DEFINE_CPU(TYPE_RISCV_CPU_SHAKTI_C,         rv64_sifive_u_cpu_init),
     DEFINE_CPU(TYPE_RISCV_CPU_THEAD_C906,       rv64_thead_c906_cpu_init),
+    DEFINE_CPU(TYPE_RISCV_CPU_VEYRON_V1,        rv64_veyron_v1_cpu_init),
     DEFINE_DYNAMIC_CPU(TYPE_RISCV_CPU_BASE128,  rv128_base_cpu_init),
 #endif
 };

target/riscv/cpu_vendorid.h

@@ -3,4 +3,8 @@
 
 #define THEAD_VENDOR_ID         0x5b7
 
+#define VEYRON_V1_MARCHID       0x8000000000010000
+#define VEYRON_V1_MIMPID        0x111
+#define VEYRON_V1_MVENDORID     0x61f
+
 #endif /*  TARGET_RISCV_CPU_VENDORID_H */