[PATCH v4 04/10] target/riscv: Add the lowRISC Ibex CPU

[Alistair Francis]

Ibex is a small and efficient, 32-bit, in-order RISC-V core with
a 2-stage pipeline that implements the RV32IMC instruction set
architecture.

For more details on lowRISC see here:
https://github.com/lowRISC/ibex

Signed-off-by: Alistair Francis <address@hidden>
Reviewed-by: Bin Meng <address@hidden>
Reviewed-by: LIU Zhiwei <address@hidden>
---
 target/riscv/cpu.h |  1 +
 target/riscv/cpu.c | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index d0e7f5b9c5..8733d7467f 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -35,6 +35,7 @@
 #define TYPE_RISCV_CPU_ANY              RISCV_CPU_TYPE_NAME("any")
 #define TYPE_RISCV_CPU_BASE32           RISCV_CPU_TYPE_NAME("rv32")
 #define TYPE_RISCV_CPU_BASE64           RISCV_CPU_TYPE_NAME("rv64")
+#define TYPE_RISCV_CPU_IBEX             RISCV_CPU_TYPE_NAME("lowrisc-ibex")
 #define TYPE_RISCV_CPU_SIFIVE_E31       RISCV_CPU_TYPE_NAME("sifive-e31")
 #define TYPE_RISCV_CPU_SIFIVE_E34       RISCV_CPU_TYPE_NAME("sifive-e34")
 #define TYPE_RISCV_CPU_SIFIVE_E51       RISCV_CPU_TYPE_NAME("sifive-e51")
diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index 8deba3d16d..4761ebad42 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -154,6 +154,16 @@ static void rv32gcsu_priv1_10_0_cpu_init(Object *obj)
     set_feature(env, RISCV_FEATURE_PMP);
 }
 
+static void rv32imcu_nommu_cpu_init(Object *obj)
+{
+    CPURISCVState *env = &RISCV_CPU(obj)->env;
+    set_misa(env, RV32 | RVI | RVM | RVC | RVU);
+    set_priv_version(env, PRIV_VERSION_1_10_0);
+    set_resetvec(env, 0x8090);
+    set_feature(env, RISCV_FEATURE_PMP);
+    qdev_prop_set_bit(DEVICE(obj), "mmu", false);
+}
+
 static void rv32imacu_nommu_cpu_init(Object *obj)
 {
     CPURISCVState *env = &RISCV_CPU(obj)->env;
@@ -618,6 +628,7 @@ static const TypeInfo riscv_cpu_type_infos[] = {
     DEFINE_CPU(TYPE_RISCV_CPU_ANY,              riscv_any_cpu_init),
 #if defined(TARGET_RISCV32)
     DEFINE_CPU(TYPE_RISCV_CPU_BASE32,           riscv_base32_cpu_init),
+    DEFINE_CPU(TYPE_RISCV_CPU_IBEX,             rv32imcu_nommu_cpu_init),
     DEFINE_CPU(TYPE_RISCV_CPU_SIFIVE_E31,       rv32imacu_nommu_cpu_init),
     DEFINE_CPU(TYPE_RISCV_CPU_SIFIVE_E34,       rv32imafcu_nommu_cpu_init),
     DEFINE_CPU(TYPE_RISCV_CPU_SIFIVE_U34,       rv32gcsu_priv1_10_0_cpu_init),
-- 
2.26.2