arch/tricore: add tricore_mtcr and tricore_mfcr macros

Add tricore_mtcr()/tricore_mfcr() inline-assembly wrappers for the
MTCR/MFCR (move to/from Core Special Function Register) instructions.
These let arch/tricore code access CSRs directly without relying on the
Infineon iLLD intrinsics, and are used by the following iLLD-removal
change in the performance-counter path.

Signed-off-by: zhangyu117 <zhangyu117@xiaomi.com>

arch/tricore/include/arch.h

@@ -42,6 +42,20 @@
  * Pre-processor Definitions
  ****************************************************************************/
 
+/* MTCR and MFCR - move to / from Core Special Function Register */
+
+#define tricore_mtcr(reg, val)                                         \
+  ({                                                                   \
+    __asm__ volatile ("mtcr %0,%1\n\t"::"i"(reg),"d"(val):"memory");   \
+  })
+
+#define tricore_mfcr(reg)                                              \
+  ({                                                                   \
+    uint32_t __val;                                                    \
+    __asm__ volatile ("mfcr %0,%1": "=d" (__val) :"i"(reg): "memory"); \
+    __val;                                                             \
+  })
+
 /****************************************************************************
  * Public Types
  ****************************************************************************/