[RFC v3 08/10] target/arm: Introduce user_mask to indicate whether the feature is set explicitly

[Peng Liang]

To add CPU feature dependencies, we need to known whether a CPU feature
is set explicitly or automatically by dependencies mechanism.  Introduce
user_mask to do that.

Signed-off-by: zhanghailiang <zhang.zhanghaili...@huawei.com>
Signed-off-by: Peng Liang <liangpen...@huawei.com>
---
 target/arm/cpu.c | 2 ++
 target/arm/cpu.h | 1 +
 2 files changed, 3 insertions(+)

diff --git a/target/arm/cpu.c b/target/arm/cpu.c
index c5530550ece0..8c84a16d92a8 100644
--- a/target/arm/cpu.c
+++ b/target/arm/cpu.c
@@ -1306,6 +1306,8 @@ static void arm_cpu_set_feature_prop(Object *obj, Visitor 
*v, const char *name,
         return;
     }
 
+    isar->user_mask[feat->reg] |= MAKE_64BIT_MASK(feat->shift, feat->length);
+
     if (value) {
         if (object_property_get_bool(obj, feat->name, &error_abort)) {
             return;
diff --git a/target/arm/cpu.h b/target/arm/cpu.h
index c20f1ae20429..1ee653a712fd 100644
--- a/target/arm/cpu.h
+++ b/target/arm/cpu.h
@@ -932,6 +932,7 @@ struct ARMCPU {
      */
     struct ARMISARegisters {
         uint64_t regs[ID_MAX];
+        uint64_t user_mask[ID_MAX];
     } isar;
     uint64_t midr;
     uint32_t revidr;
-- 
2.26.2