[PATCH v2 2/4] target/loongarch: Add cpu feature flags

[Song Gao]

CPULoongArchState adds cpu feature flags features.
Intrduce loongarch_feature() to check feature and
set_feature() to set feature.

Signed-off-by: Song Gao <gaosong@loongson.cn>
---
 target/loongarch/cpu.c |  4 ++++
 target/loongarch/cpu.h | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)

diff --git a/target/loongarch/cpu.c b/target/loongarch/cpu.c
index ef6922e812..87fcd08110 100644
--- a/target/loongarch/cpu.c
+++ b/target/loongarch/cpu.c
@@ -366,6 +366,10 @@ static void loongarch_la464_initfn(Object *obj)
     CPULoongArchState *env = &cpu->env;
     int i;
 
+    env->features = 0;
+    set_feature(env, CPU_FEATURE_LSX);
+    set_feature(env, CPU_FEATURE_LASX);
+
     for (i = 0; i < 21; i++) {
         env->cpucfg[i] = 0x0;
     }
diff --git a/target/loongarch/cpu.h b/target/loongarch/cpu.h
index 8b54cf109c..b98064945a 100644
--- a/target/loongarch/cpu.h
+++ b/target/loongarch/cpu.h
@@ -295,6 +295,8 @@ typedef struct CPUArchState {
     uint64_t lladdr; /* LL virtual address compared against SC */
     uint64_t llval;
 
+    uint64_t features;
+
     /* LoongArch CSRs */
     uint64_t CSR_CRMD;
     uint64_t CSR_PRMD;
@@ -364,6 +366,36 @@ typedef struct CPUArchState {
 #endif
 } CPULoongArchState;
 
+/*
+ * See arch/loongarch/include/asm/cpu.h
+ * and arch/loongarch/include/uapi/asm/hwcap.h
+ */
+enum loongarch_features {
+    CPU_FEATURE_CPUCFG,
+    CPU_FEATURE_LAM,
+    CPU_FEATURE_UAL,
+    CPU_FEATURE_FPU,
+    CPU_FEATURE_LSX,
+    CPU_FEATURE_LASX,
+    CPU_FEATURE_CRC32,
+    CPU_FEATURE_COMPLEX,
+    CPU_FEATURE_CRYPTO,
+    CPU_FEATURE_LVZ,
+    CPU_FEATURE_LBT_X86,
+    CPU_FEATURE_LBT_ARM,
+    CPU_FEATURE_LBT_MIPS,
+};
+
+static inline int loongarch_feature(CPULoongArchState *env, int feature)
+{
+    return (env->features & (1ULL << feature)) != 0;
+}
+
+static inline void set_feature(CPULoongArchState *env, int feature)
+{
+    env->features |= 1ULL << feature;
+}
+
 /**
  * LoongArchCPU:
  * @env: #CPULoongArchState
-- 
2.25.1