tests,plic: disable time intr to test wfi

am/src/nemu/isa/riscv/cte64.c

@@ -8,7 +8,7 @@ static void init_machine_exception() {
   asm volatile("csrw mtvec, %0" : : "r"(__am_timervec));
 }
 
-
+int g_config_disable_timer = 0; // dirty hack of __am_init_cte64(), to be refactored
 extern void init_timer();
 extern void enable_timer();
 extern void init_pmp(); 
@@ -52,7 +52,9 @@ void __am_init_cte64() {
 
   init_machine_exception();
   init_timer();
-  enable_timer();
+  if(!g_config_disable_timer){
+    enable_timer();
+  }
   init_eip();
 
   // enter S-mode

tests/amtest/include/amtest.h

@@ -12,6 +12,7 @@
 #define REEH(h) ({ _Context *h(_Event, _Context *); seip_handler_reg(h);})
 #define RTEH(h) ({ _Context *h(_Event, _Context *); stip_handler_reg(h);})
 #define RCEH(h) ({ _Context *h(_Event, _Context *); secall_handler_reg(h);})
+#define NOTIMEINT() ({ extern int g_config_disable_timer; g_config_disable_timer = 1;})
 
 #define VME(f1, f2) ({ void *f1(size_t); void f2(void *); _vme_init(f1, f2); })
 #define PRE_MPE(arg) ({ _mpe_setncpu(arg); })

tests/amtest/src/main.c

@@ -23,7 +23,7 @@ int main(const char *args) {
     CASE('x', dma_test);
     CASE('h', hello);
     CASE('i', hello_intr, IOE, CTE(simple_trap), REEH(simple_trap), RCEH(simple_trap), RTEH(simple_trap));
-    CASE('e', external_intr, IOE, CTE(external_trap), REEH(external_trap), RTEH(external_trap));
+    CASE('e', external_intr, IOE, NOTIMEINT(), CTE(external_trap), REEH(external_trap), RTEH(external_trap));
     CASE('d', devscan, IOE);
     CASE('m', finalize, PRE_MPE(args[1]), MPE(mp_print));
     CASE('t', rtc_test, IOE);