[libcpu] remove gtimer/pmu from cortex-a

Author: BernardXiong

libcpu/arm/cortex-a/SConscript

@@ -8,11 +8,8 @@ cwd     = GetCurrentDir()
 src     = Split('''
 cache.c
 cpu.c
-gtimer.c
 mmu.c
-pmu.c
 stack.c
-
 ''')
 CPPPATH = [cwd]
 

libcpu/arm/cortex-a/armv7.h

@@ -69,4 +69,10 @@ struct rt_hw_stack
 #define E_Bit       (1<<9)
 #define J_Bit       (1<<24)
 
+#define PABT_EXCEPTION 0x1
+#define DABT_EXCEPTION 0x2
+#define UND_EXCEPTION  0x3
+#define SWI_EXCEPTION  0x4
+#define RESV_EXCEPTION 0xF
+
 #endif