[RFC v3 03/71] target/riscv: rvv-1.0: add mstatus VS field

[frank . chang]

From: LIU Zhiwei <zhiwei_liu@c-sky.com>

Signed-off-by: LIU Zhiwei <zhiwei_liu@c-sky.com>
Signed-off-by: Frank Chang <frank.chang@sifive.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
 target/riscv/cpu.h        |  6 ++++++
 target/riscv/cpu_bits.h   |  1 +
 target/riscv/cpu_helper.c | 16 +++++++++++++++-
 target/riscv/csr.c        | 25 ++++++++++++++++++++++++-
 4 files changed, 46 insertions(+), 2 deletions(-)

diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index f9ef20fe89a..08d2c10a024 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -317,6 +317,7 @@ int riscv_cpu_gdb_read_register(CPUState *cpu, GByteArray 
*buf, int reg);
 int riscv_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
 bool riscv_cpu_exec_interrupt(CPUState *cs, int interrupt_request);
 bool riscv_cpu_fp_enabled(CPURISCVState *env);
+bool riscv_cpu_vector_enabled(CPURISCVState *env);
 bool riscv_cpu_virt_enabled(CPURISCVState *env);
 void riscv_cpu_set_virt_enabled(CPURISCVState *env, bool enable);
 bool riscv_cpu_force_hs_excep_enabled(CPURISCVState *env);
@@ -360,6 +361,7 @@ void riscv_cpu_set_fflags(CPURISCVState *env, target_ulong);
 
 #define TB_FLAGS_MMU_MASK   3
 #define TB_FLAGS_MSTATUS_FS MSTATUS_FS
+#define TB_FLAGS_MSTATUS_VS MSTATUS_VS
 
 typedef CPURISCVState CPUArchState;
 typedef RISCVCPU ArchCPU;
@@ -410,11 +412,15 @@ static inline void cpu_get_tb_cpu_state(CPURISCVState 
*env, target_ulong *pc,
 
 #ifdef CONFIG_USER_ONLY
     flags |= TB_FLAGS_MSTATUS_FS;
+    flags |= TB_FLAGS_MSTATUS_VS;
 #else
     flags |= cpu_mmu_index(env, 0);
     if (riscv_cpu_fp_enabled(env)) {
         flags |= env->mstatus & MSTATUS_FS;
     }
+    if (riscv_cpu_vector_enabled(env)) {
+        flags |= env->mstatus & MSTATUS_VS;
+    }
 #endif
     *pflags = flags;
 }
diff --git a/target/riscv/cpu_bits.h b/target/riscv/cpu_bits.h
index 8117e8b5a7e..a8b31208833 100644
--- a/target/riscv/cpu_bits.h
+++ b/target/riscv/cpu_bits.h
@@ -367,6 +367,7 @@
 #define MSTATUS_SPIE        0x00000020
 #define MSTATUS_MPIE        0x00000080
 #define MSTATUS_SPP         0x00000100
+#define MSTATUS_VS          0x00000600
 #define MSTATUS_MPP         0x00001800
 #define MSTATUS_FS          0x00006000
 #define MSTATUS_XS          0x00018000
diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index 75d2ae34349..3fae736529a 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -108,10 +108,24 @@ bool riscv_cpu_fp_enabled(CPURISCVState *env)
     return false;
 }
 
+/* Return true is vector support is currently enabled */
+bool riscv_cpu_vector_enabled(CPURISCVState *env)
+{
+    if (env->mstatus & MSTATUS_VS) {
+        if (riscv_cpu_virt_enabled(env) && !(env->mstatus_hs & MSTATUS_VS)) {
+            return false;
+        }
+        return true;
+    }
+
+    return false;
+}
+
 void riscv_cpu_swap_hypervisor_regs(CPURISCVState *env)
 {
     target_ulong mstatus_mask = MSTATUS_MXR | MSTATUS_SUM | MSTATUS_FS |
-                                MSTATUS_SPP | MSTATUS_SPIE | MSTATUS_SIE;
+                                MSTATUS_SPP | MSTATUS_SPIE | MSTATUS_SIE |
+                                MSTATUS_VS;
     bool current_virt = riscv_cpu_virt_enabled(env);
 
     g_assert(riscv_has_ext(env, RVH));
diff --git a/target/riscv/csr.c b/target/riscv/csr.c
index 6a96a01b1cf..b0413f52d77 100644
--- a/target/riscv/csr.c
+++ b/target/riscv/csr.c
@@ -180,6 +180,7 @@ static int write_fcsr(CPURISCVState *env, int csrno, 
target_ulong val)
         return -1;
     }
     env->mstatus |= MSTATUS_FS;
+    env->mstatus |= MSTATUS_VS;
 #endif
     env->frm = (val & FSR_RD) >> FSR_RD_SHIFT;
     if (vs(env, csrno) >= 0) {
@@ -210,6 +211,13 @@ static int read_vxrm(CPURISCVState *env, int csrno, 
target_ulong *val)
 
 static int write_vxrm(CPURISCVState *env, int csrno, target_ulong val)
 {
+#if !defined(CONFIG_USER_ONLY)
+    if (!env->debugger && !riscv_cpu_vector_enabled(env)) {
+        return -1;
+    }
+    env->mstatus |= MSTATUS_VS;
+#endif
+
     env->vxrm = val;
     return 0;
 }
@@ -222,6 +230,13 @@ static int read_vxsat(CPURISCVState *env, int csrno, 
target_ulong *val)
 
 static int write_vxsat(CPURISCVState *env, int csrno, target_ulong val)
 {
+#if !defined(CONFIG_USER_ONLY)
+    if (!env->debugger && !riscv_cpu_vector_enabled(env)) {
+        return -1;
+    }
+    env->mstatus |= MSTATUS_VS;
+#endif
+
     env->vxsat = val;
     return 0;
 }
@@ -234,6 +249,13 @@ static int read_vstart(CPURISCVState *env, int csrno, 
target_ulong *val)
 
 static int write_vstart(CPURISCVState *env, int csrno, target_ulong val)
 {
+#if !defined(CONFIG_USER_ONLY)
+    if (!env->debugger && !riscv_cpu_vector_enabled(env)) {
+        return -1;
+    }
+    env->mstatus |= MSTATUS_VS;
+#endif
+
     env->vstart = val;
     return 0;
 }
@@ -400,7 +422,7 @@ static int write_mstatus(CPURISCVState *env, int csrno, 
target_ulong val)
     mask = MSTATUS_SIE | MSTATUS_SPIE | MSTATUS_MIE | MSTATUS_MPIE |
         MSTATUS_SPP | MSTATUS_FS | MSTATUS_MPRV | MSTATUS_SUM |
         MSTATUS_MPP | MSTATUS_MXR | MSTATUS_TVM | MSTATUS_TSR |
-        MSTATUS_TW;
+        MSTATUS_TW | MSTATUS_VS;
 #if defined(TARGET_RISCV64)
     /*
      * RV32: MPV and MTL are not in mstatus. The current plan is to
@@ -412,6 +434,7 @@ static int write_mstatus(CPURISCVState *env, int csrno, 
target_ulong val)
     mstatus = (mstatus & ~mask) | (val & mask);
 
     dirty = ((mstatus & MSTATUS_FS) == MSTATUS_FS) |
+            ((mstatus & MSTATUS_VS) == MSTATUS_VS) |
             ((mstatus & MSTATUS_XS) == MSTATUS_XS);
     mstatus = set_field(mstatus, MSTATUS_SD, dirty);
     env->mstatus = mstatus;
-- 
2.17.1