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target/riscv: Add the lowRISC Ibex CPU

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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 <alistair.francis@wdc.com>
Reviewed-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: LIU Zhiwei <zhiwei_liu@c-sky.com>
This commit is contained in:
Alistair Francis 2020-04-23 10:50:09 -07:00
parent ff832b77aa
commit 36b80ad99f
2 changed files with 11 additions and 0 deletions
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10
target/riscv/cpu.c
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@ -144,6 +144,15 @@ static void rv32gcsu_priv1_10_0_cpu_init(Object *obj)
set_resetvec(env, DEFAULT_RSTVEC);
}
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);
qdev_prop_set_bit(DEVICE(obj), "mmu", false);
}
static void rv32imacu_nommu_cpu_init(Object *obj)
{
CPURISCVState *env = &RISCV_CPU(obj)->env;
@ -593,6 +602,7 @@ 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),

1
target/riscv/cpu.h
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@ -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")