feat(freertos): Add configuration to speed up task switch

The global heap is 74332 bytes when connect to AP and get IP by DHCP.

components/freertos/Kconfig

@@ -45,5 +45,14 @@ config FREERTOS_TIMER_STACKSIZE
     default 2048
     help
         The size of the stack used by the timer in FreeRTOS.
-        
+
+config TASK_SWITCH_FASTER
+    bool "Task switch faster"
+    default y
+    help
+        Enable this option, linking task switch function and its father functions to IRAM
+        to speed up task switch. It is specific for faster I/O application and so on.
+
+        But it may cost more 1KB IRAM, so user global heap may decrease 1KB.
+
 endmenu

components/freertos/freertos/list.c

@@ -71,7 +71,7 @@ void vListInitialiseItem( ListItem_t * const pxItem )
 }
 /*-----------------------------------------------------------*/
 
-void vListInsertEnd( List_t * const pxList, ListItem_t * const pxNewListItem )
+void TASK_SW_ATTR vListInsertEnd( List_t * const pxList, ListItem_t * const pxNewListItem )
 {
 ListItem_t * const pxIndex = pxList->pxIndex;
 
@@ -167,7 +167,7 @@ const TickType_t xValueOfInsertion = pxNewListItem->xItemValue;
 }
 /*-----------------------------------------------------------*/
 
-UBaseType_t uxListRemove( ListItem_t * const pxItemToRemove )
+UBaseType_t TASK_SW_ATTR uxListRemove( ListItem_t * const pxItemToRemove )
 {
 /* The list item knows which list it is in.  Obtain the list from the list
 item. */

components/freertos/freertos/tasks.c

@@ -2611,7 +2611,7 @@ implementations require configUSE_TICKLESS_IDLE to be set to a value other than
 #endif /* INCLUDE_xTaskAbortDelay */
 /*----------------------------------------------------------*/
 
-BaseType_t xTaskIncrementTick( void )
+BaseType_t TASK_SW_ATTR xTaskIncrementTick( void )
 {
 TCB_t * pxTCB;
 TickType_t xItemValue;
@@ -2873,7 +2873,7 @@ BaseType_t xSwitchRequired = pdFALSE;
 #endif /* configUSE_APPLICATION_TASK_TAG */
 /*-----------------------------------------------------------*/
 
-void vTaskSwitchContext( void )
+void TASK_SW_ATTR vTaskSwitchContext( void )
 {
 	if( uxSchedulerSuspended != ( UBaseType_t ) pdFALSE )
 	{

components/freertos/port/esp8266/include/freertos/FreeRTOSConfig.h

@@ -127,5 +127,11 @@ NVIC value of 255. */
 /* add this to dump task stack information */
 #define configRECORD_STACK_HIGH_ADDRESS 1
 
+#ifdef CONFIG_TASK_SWITCH_FASTER
+#define TASK_SW_ATTR IRAM_ATTR
+#else
+#define TASK_SW_ATTR
+#endif
+
 #endif /* FREERTOS_CONFIG_H */
 

components/freertos/port/esp8266/os_cpu_a.S

@@ -59,8 +59,12 @@ vPortYield:
     
     call0	_xt_int_enter
 	call0	vPortEnterCritical
+#ifndef CONFIG_TASK_SWITCH_FASTER
     movi	a0, vTaskSwitchContext
-    callx0	a0	
+    callx0	a0
+#else
+    call0   vTaskSwitchContext
+#endif
     call0	vPortExitCritical
     call0	_xt_int_exit
     
@@ -239,8 +243,12 @@ _xt_timer_int:
 
     /* Call the uCOS-II tick handler. */
     #ifdef __XTENSA_CALL0_ABI__         /* OSTimeTick()                       */
+#ifndef CONFIG_TASK_SWITCH_FASTER
     movi 	a0, xPortSysTickHandle
     callx0 	a0
+#else
+    call0   xPortSysTickHandle
+#endif
     #else
     call4   xTaskIncrementTick
     #endif
@@ -281,8 +289,12 @@ _xt_timer_int1:
     #endif
 
     /* Call the uCOS-II tick handler. */
+#ifndef CONFIG_TASK_SWITCH_FASTER
     movi 	a0, vTaskSwitchContext
     callx0	a0
+#else
+    call0   vTaskSwitchContext
+#endif
 
     #ifdef __XTENSA_CALL0_ABI__
     /* Restore a2 and a3. */

components/freertos/port/esp8266/port.c

@@ -118,7 +118,7 @@ void IRAM_ATTR HDL_MAC_SIG_IN_LV1_ISR(void)
 
 extern portBASE_TYPE MacIsrSigPostDefHdl(void);
 
-void SoftIsrHdl(void* arg)
+void TASK_SW_ATTR SoftIsrHdl(void* arg)
 {
     ETS_NMI_LOCK();
 
@@ -137,7 +137,7 @@ void SoftIsrHdl(void* arg)
     ETS_NMI_UNLOCK();
 }
 
-void xPortSysTickHandle(void)
+void TASK_SW_ATTR xPortSysTickHandle(void)
 {
     if (xTaskIncrementTick() != pdFALSE) {
         vTaskSwitchContext();
@@ -284,7 +284,7 @@ void _xt_isr_attach(uint8_t i, _xt_isr func, void* arg)
     isr[i].arg = arg;
 }
 
-uint16_t _xt_isr_handler(uint16_t i)
+uint16_t TASK_SW_ATTR _xt_isr_handler(uint16_t i)
 {
     uint8_t index;
 

components/freertos/port/esp8266/xtensa_vectors.S

@@ -927,8 +927,12 @@ _xt_user_entry1:
     s32i    a1, a0, 0
     mov     a1, a0
 
+#ifndef CONFIG_TASK_SWITCH_FASTER
     movi    a0, _xt_isr_handler
     callx0	a0
+#else
+    call0   _xt_isr_handler
+#endif
 
     movi    a0, _chip_interrupt_tmp
     l32i    a1, a0, 0