arm64: add arm64_current_el to obtain current EL

Summary Add a macro to obtain current execute level Signed-off-by: qinwei1 <[email protected]>
apache · Sep 26, 2024 · 8ae3575 · 8ae3575
1 parent c535fb1
commit 8ae3575
Showing 1 changed file with 20 additions and 0 deletions.
diff --git a/arch/arm64/src/common/arm64_arch.h b/arch/arm64/src/common/arm64_arch.h
@@ -391,6 +391,26 @@ static inline void arch_nop(void)
   __asm__ volatile ("nop");
 }
 
+/****************************************************************************
+ * Name:
+ *   arm64_current_el()
+ *
+ * Description:
+ *
+ *   Get current execution level
+ *
+ ****************************************************************************/
+
+#define arm64_current_el()                \
+  ({                                      \
+    uint64_t __el;                        \
+    int      __ret;                       \
+    __asm__ volatile ("mrs %0, CurrentEL" \
+                      : "=r" (__el));     \
+    __ret = GET_EL(__el);                 \
+    __ret;                                \
+  })
+
 /****************************************************************************
  * Name:
  *   read_/write_/zero_ sysreg