[RFC PATCH 06/16] target/riscv: Add hard-coded CPU state of WG extension

[Jim Shu]

Add hard-coded state of WG extension. 'mwid' is the M-mode WID of CPU.
'mwidlist' is the list of allowed WID value of 'mlwid' CSR.

These CPU states can be set by CPU option, or can be set by machine code
via newly added APIs. If we want different WG configs of CPUs, we should
set it by machine code.

Signed-off-by: Jim Shu <jim.shu@sifive.com>
---
 target/riscv/cpu.c        |  2 ++
 target/riscv/cpu.h        |  2 ++
 target/riscv/cpu_cfg.h    |  2 ++
 target/riscv/cpu_helper.c | 18 ++++++++++++++++++
 4 files changed, 24 insertions(+)

diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
index d70eedf957..4e87fa4d5b 100644
--- a/target/riscv/cpu.c
+++ b/target/riscv/cpu.c
@@ -2291,6 +2291,8 @@ static Property riscv_cpu_properties[] = {
      * it with -x and default to 'false'.
      */
     DEFINE_PROP_BOOL("x-misa-w", RISCVCPU, cfg.misa_w, false),
+    DEFINE_PROP_UINT32("mwid", RISCVCPU, cfg.mwid, UINT32_MAX),
+    DEFINE_PROP_UINT32("mwidlist", RISCVCPU, cfg.mwidlist, UINT32_MAX),
     DEFINE_PROP_END_OF_LIST(),
 };
 
diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index 6fe0d712b4..2d3bfedbba 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -540,6 +540,8 @@ void riscv_cpu_set_aia_ireg_rmw_fn(CPURISCVState *env, 
uint32_t priv,
                                    void *rmw_fn_arg);
 
 RISCVException smstateen_acc_ok(CPURISCVState *env, int index, uint64_t bit);
+void riscv_cpu_set_wg_mwid(CPURISCVState *env, uint32_t mwid);
+void riscv_cpu_set_wg_mwidlist(CPURISCVState *env, uint32_t mwidlist);
 #endif /* !CONFIG_USER_ONLY */
 
 void riscv_cpu_set_mode(CPURISCVState *env, target_ulong newpriv);
diff --git a/target/riscv/cpu_cfg.h b/target/riscv/cpu_cfg.h
index 23e779ae08..de9c134b15 100644
--- a/target/riscv/cpu_cfg.h
+++ b/target/riscv/cpu_cfg.h
@@ -166,6 +166,8 @@ struct RISCVCPUConfig {
     bool pmp;
     bool debug;
     bool misa_w;
+    uint32_t mwid;
+    uint32_t mwidlist;
 
     bool short_isa_string;
 
diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index 161df34626..ff20ab6ab8 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -149,6 +149,24 @@ void cpu_get_tb_cpu_state(CPURISCVState *env, vaddr *pc,
     *pflags = flags;
 }
 
+#ifndef CONFIG_USER_ONLY
+void riscv_cpu_set_wg_mwid(CPURISCVState *env, uint32_t mwid)
+{
+    CPUState *cs = env_cpu(env);
+    RISCVCPU *cpu = RISCV_CPU(cs);
+
+    cpu->cfg.mwid = mwid;
+}
+
+void riscv_cpu_set_wg_mwidlist(CPURISCVState *env, uint32_t mwidlist)
+{
+    CPUState *cs = env_cpu(env);
+    RISCVCPU *cpu = RISCV_CPU(cs);
+
+    cpu->cfg.mwidlist = mwidlist;
+}
+#endif /* CONFIG_USER_ONLY */
+
 void riscv_cpu_update_mask(CPURISCVState *env)
 {
     target_ulong mask = 0, base = 0;
-- 
2.17.1