[for-8.1,v3,12/26] target/riscv/cpu.c: redesign register_cpu_props()

Commit Message

Daniel Henrique Barboza March 18, 2023, 8:04 p.m. UTC

Now that the function is a no-op if 'env.misa_ext != 0', and no one that
are setting misa_ext != 0 is calling it because set_misa() is setting
the cpu cfg accordingly, remove the now deprecated code and rename the
function to register_generic_cpu_props().

This function is now doing exactly what the name says: it is creating
user-facing properties to allow changes in the CPU cfg via the QEMU
command line, setting default values if no user input is provided.

Note that there's the possibility of a CPU to set a certain misa value
and, at the same, also want user-facing flags and defaults from this
function. This is not the case since commit 26b2bc58599c ("target/riscv:
Don't expose the CPU properties on names CPUs"), but given that this is
also a possibility, clarify in the function that using this function
will overwrite existing values in cpu->cfg.

Signed-off-by: Daniel Henrique Barboza <[e-mail]>
---
 target/riscv/cpu.c | 48 ++++++++++------------------------------------
 1 file changed, 10 insertions(+), 38 deletions(-)

Patch

diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index 7841676473..6b5096d25e 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -221,7 +221,7 @@  static const char * const riscv_intr_names[] = {
     "reserved"
 };
 
-static void register_cpu_props(Object *obj);
+static void register_generic_cpu_props(Object *obj);
 
 const char *riscv_cpu_get_trap_name(target_ulong cause, bool async)
 {
@@ -386,7 +386,7 @@  static void rv64_base_cpu_init(Object *obj)
     CPURISCVState *env = &RISCV_CPU(obj)->env;
     /* We set this in the realise function */
     set_misa(env, MXL_RV64, 0);
-    register_cpu_props(obj);
+    register_generic_cpu_props(obj);
     /* Set latest version of privileged specification */
     env->priv_ver = PRIV_VERSION_LATEST;
 #ifndef CONFIG_USER_ONLY
@@ -475,7 +475,7 @@  static void rv128_base_cpu_init(Object *obj)
     CPURISCVState *env = &RISCV_CPU(obj)->env;
     /* We set this in the realise function */
     set_misa(env, MXL_RV128, 0);
-    register_cpu_props(obj);
+    register_generic_cpu_props(obj);
     /* Set latest version of privileged specification */
     env->priv_ver = PRIV_VERSION_LATEST;
 #ifndef CONFIG_USER_ONLY
@@ -488,7 +488,7 @@  static void rv32_base_cpu_init(Object *obj)
     CPURISCVState *env = &RISCV_CPU(obj)->env;
     /* We set this in the realise function */
     set_misa(env, MXL_RV32, 0);
-    register_cpu_props(obj);
+    register_generic_cpu_props(obj);
     /* Set latest version of privileged specification */
     env->priv_ver = PRIV_VERSION_LATEST;
 #ifndef CONFIG_USER_ONLY
@@ -575,7 +575,7 @@  static void riscv_host_cpu_init(Object *obj)
 #elif defined(TARGET_RISCV64)
     set_misa(env, MXL_RV64, 0);
 #endif
-    register_cpu_props(obj);
+    register_generic_cpu_props(obj);
 }
 #endif
 
@@ -1557,44 +1557,16 @@  static Property riscv_cpu_extensions[] = {
 };
 
 /*
- * Register CPU props based on env.misa_ext. If a non-zero
- * value was set, register only the required cpu->cfg.ext_*
- * properties and leave. env.misa_ext = 0 means that we want
- * all the default properties to be registered.
+ * Register generic CPU props with user-facing flags declared
+ * in riscv_cpu_extensions[].
+ *
+ * Note that this will overwrite existing values in cpu->cfg.
  */
-static void register_cpu_props(Object *obj)
+static void register_generic_cpu_props(Object *obj)
 {
-    RISCVCPU *cpu = RISCV_CPU(obj);
-    uint32_t misa_ext = cpu->env.misa_ext;
     Property *prop;
     DeviceState *dev = DEVICE(obj);
 
-    /*
-     * If misa_ext is not zero, set cfg properties now to
-     * allow them to be read during riscv_cpu_realize()
-     * later on.
-     */
-    if (cpu->env.misa_ext != 0) {
-        cpu->cfg.ext_i = misa_ext & RVI;
-        cpu->cfg.ext_e = misa_ext & RVE;
-        cpu->cfg.ext_m = misa_ext & RVM;
-        cpu->cfg.ext_a = misa_ext & RVA;
-        cpu->cfg.ext_f = misa_ext & RVF;
-        cpu->cfg.ext_d = misa_ext & RVD;
-        cpu->cfg.ext_v = misa_ext & RVV;
-        cpu->cfg.ext_c = misa_ext & RVC;
-        cpu->cfg.ext_s = misa_ext & RVS;
-        cpu->cfg.ext_u = misa_ext & RVU;
-        cpu->cfg.ext_h = misa_ext & RVH;
-        cpu->cfg.ext_j = misa_ext & RVJ;
-
-        /*
-         * We don't want to set the default riscv_cpu_extensions
-         * in this case.
-         */
-        return;
-    }
-
     for (prop = riscv_cpu_extensions; prop && prop->name; prop++) {
         qdev_property_add_static(dev, prop);
     }