fix: 以g_sysSchedStartTime是否为0判断时间轴是否生效存在极限场景导致调度时间不生效

初始化调度时间不以g_sysSchedStartTime是否为0为界限，而以g_sysSchedStartTime是否为64位最大值
为界限，避免特殊以下场景：调度开启时系统时间为0，导致初始化的g_sysSchedStartTime还是0，导致
调度启动后获取的调度时间轴始终为0.
Close  #I45HP5
Signed-off-by: Nzhushengle <zhushengle@huawei.com>
Change-Id: I5272c79f06b53361ee7b931081d3a3276db59073

kernel/base/include/los_sched_pri.h

@@ -56,11 +56,11 @@ extern UINT64 g_sysSchedStartTime;
 
 STATIC INLINE UINT64 OsGetCurrSchedTimeCycle(VOID)
 {
-    if (g_sysSchedStartTime == 0) {
-        return g_sysSchedStartTime;
+    if (g_sysSchedStartTime != OS_64BIT_MAX) {
+        return (HalClockGetCycles() - g_sysSchedStartTime);
     }
 
-    return (HalClockGetCycles() - g_sysSchedStartTime);
+    return 0;
 }
 
 STATIC INLINE VOID OsSchedIrqUpdateUsedTime(VOID)

kernel/base/sched/sched_sq/los_sched.c

@@ -48,7 +48,6 @@
 #endif
 
 #define OS_32BIT_MAX               0xFFFFFFFFUL
-#define OS_64BIT_MAX               0xFFFFFFFFFFFFFFFFULL
 #define OS_SCHED_FIFO_TIMEOUT      0x7FFFFFFF
 #define OS_PRIORITY_QUEUE_NUM      32
 #define PRIQUEUE_PRIOR0_BIT        0x80000000U
@@ -73,7 +72,7 @@ typedef struct {
 
 STATIC Sched *g_sched = NULL;
 STATIC UINT64 g_schedTickMaxResponseTime;
-UINT64 g_sysSchedStartTime = 0;
+UINT64 g_sysSchedStartTime = OS_64BIT_MAX;
 
 #ifdef LOSCFG_SCHED_TICK_DEBUG
 #define OS_SCHED_DEBUG_DATA_NUM  1000
@@ -253,7 +252,7 @@ UINT32 OsSchedSetTickTimerType(UINT32 timerType)
 
 STATIC VOID OsSchedSetStartTime(UINT64 currCycle)
 {
-    if (g_sysSchedStartTime == 0) {
+    if (g_sysSchedStartTime == OS_64BIT_MAX) {
         g_sysSchedStartTime = currCycle;
     }
 }
@@ -889,7 +888,9 @@ VOID OsSchedStart(VOID)
 
     SCHEDULER_LOCK(intSave);
 
-    OsTickStart();
+    if (cpuid == 0) {
+        OsTickStart();
+    }
 
     LosTaskCB *newTask = OsGetTopTask();
     LosProcessCB *newProcess = OS_PCB_FROM_PID(newTask->processID);

kernel/include/los_typedef.h

@@ -188,6 +188,7 @@ typedef size_t             BOOL;
 #define OS_ERROR           (UINT32)(-1)
 #define OS_INVALID         (UINT32)(-1)
 #define OS_INVALID_VALUE   ((UINT32)0xFFFFFFFF)
+#define OS_64BIT_MAX       0xFFFFFFFFFFFFFFFFULL
 
 #define asm __asm
 #ifdef typeof