[PATCH v3 15/15] target/riscv: cpu: Set XLEN independently from target

From: Alistair Francis <alistair.francis@wdc.com>
To: qemu-devel@nongnu.org, qemu-riscv@nongnu.org
Cc: alistair.francis@wdc.com, bmeng.cn@gmail.com, palmer@dabbelt.com,
	alistair23@gmail.com
Subject: [PATCH v3 15/15] target/riscv: cpu: Set XLEN independently from target
Date: Mon, 14 Dec 2020 12:34:37 -0800	[thread overview]
Message-ID: <0508789530dc788a1abda41e04bafb65d377a1ad.1607967113.git.alistair.francis@wdc.com> (raw)
In-Reply-To: <cover.1607967113.git.alistair.francis@wdc.com>

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Bin Meng <bin.meng@windriver.com>
Tested-by: Bin Meng <bin.meng@windriver.com>
---
 target/riscv/cpu.c | 25 ++++++++++++++++---------
 1 file changed, 16 insertions(+), 9 deletions(-)

diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index 47b738c314..254cd83f8b 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -151,14 +151,14 @@ static void riscv_any_cpu_init(Object *obj)
     set_priv_version(env, PRIV_VERSION_1_11_0);
 }
 
-static void riscv_base_cpu_init(Object *obj)
+#if defined(TARGET_RISCV64)
+static void rv64_base_cpu_init(Object *obj)
 {
     CPURISCVState *env = &RISCV_CPU(obj)->env;
     /* We set this in the realise function */
-    set_misa(env, 0);
+    set_misa(env, RV64);
 }
 
-#ifdef TARGET_RISCV64
 static void rv64_sifive_u_cpu_init(Object *obj)
 {
     CPURISCVState *env = &RISCV_CPU(obj)->env;
@@ -174,6 +174,13 @@ static void rv64_sifive_e_cpu_init(Object *obj)
     qdev_prop_set_bit(DEVICE(obj), "mmu", false);
 }
 #else
+static void rv32_base_cpu_init(Object *obj)
+{
+    CPURISCVState *env = &RISCV_CPU(obj)->env;
+    /* We set this in the realise function */
+    set_misa(env, RV32);
+}
+
 static void rv32_sifive_u_cpu_init(Object *obj)
 {
     CPURISCVState *env = &RISCV_CPU(obj)->env;
@@ -372,7 +379,7 @@ static void riscv_cpu_realize(DeviceState *dev, Error **errp)
     RISCVCPUClass *mcc = RISCV_CPU_GET_CLASS(dev);
     int priv_version = PRIV_VERSION_1_11_0;
     int vext_version = VEXT_VERSION_0_07_1;
-    target_ulong target_misa = 0;
+    target_ulong target_misa = env->misa;
     Error *local_err = NULL;
 
     cpu_exec_realizefn(cs, &local_err);
@@ -407,8 +414,8 @@ static void riscv_cpu_realize(DeviceState *dev, Error **errp)
 
     set_resetvec(env, cpu->cfg.resetvec);
 
-    /* If misa isn't set (rv32 and rv64 machines) set it here */
-    if (!env->misa) {
+    /* If only XLEN is set for misa, then set misa from properties */
+    if (env->misa == RV32 || env->misa == RV64) {
         /* Do some ISA extension error checking */
         if (cpu->cfg.ext_i && cpu->cfg.ext_e) {
             error_setg(errp,
@@ -504,7 +511,7 @@ static void riscv_cpu_realize(DeviceState *dev, Error **errp)
             set_vext_version(env, vext_version);
         }
 
-        set_misa(env, RVXLEN | target_misa);
+        set_misa(env, target_misa);
     }
 
     riscv_cpu_register_gdb_regs_for_features(cs);
@@ -655,13 +662,13 @@ 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_base_cpu_init),
+    DEFINE_CPU(TYPE_RISCV_CPU_BASE32,           rv32_base_cpu_init),
     DEFINE_CPU(TYPE_RISCV_CPU_IBEX,             rv32_ibex_cpu_init),
     DEFINE_CPU(TYPE_RISCV_CPU_SIFIVE_E31,       rv32_sifive_e_cpu_init),
     DEFINE_CPU(TYPE_RISCV_CPU_SIFIVE_E34,       rv32_imafcu_nommu_cpu_init),
     DEFINE_CPU(TYPE_RISCV_CPU_SIFIVE_U34,       rv32_sifive_u_cpu_init),
 #elif defined(TARGET_RISCV64)
-    DEFINE_CPU(TYPE_RISCV_CPU_BASE64,           riscv_base_cpu_init),
+    DEFINE_CPU(TYPE_RISCV_CPU_BASE64,           rv64_base_cpu_init),
     DEFINE_CPU(TYPE_RISCV_CPU_SIFIVE_E51,       rv64_sifive_e_cpu_init),
     DEFINE_CPU(TYPE_RISCV_CPU_SIFIVE_U54,       rv64_sifive_u_cpu_init),
 #endif
-- 
2.29.2


