feat(esp8266): Refactor task watch dog

1. Remove old watch dog function
2. Put WIFI NVS index table from RAM to flash

components/esp8266/include/esp8266/eagle_soc.h

@@ -117,10 +117,31 @@
 
 //Interrupt remap control registers define{{
 #define EDGE_INT_ENABLE_REG         (PERIPHS_DPORT_BASEADDR + 0x04)
+#define WDT_EDGE_INT_ENABLE()       SET_PERI_REG_MASK(EDGE_INT_ENABLE_REG, BIT0)
 #define TM1_EDGE_INT_ENABLE()       SET_PERI_REG_MASK(EDGE_INT_ENABLE_REG, BIT1)
 #define TM1_EDGE_INT_DISABLE()      CLEAR_PERI_REG_MASK(EDGE_INT_ENABLE_REG, BIT1)
 //}}
 
+
+//Watch dog reg {{
+#define PERIPHS_WDT_BASEADDR        0x60000900
+
+#define WDT_CTL_ADDRESS             0
+#define WDT_OP_ADDRESS              0x4
+#define WDT_OP_ND_ADDRESS           0x8
+#define WDT_RST_ADDRESS             0x14
+
+#define WDT_CTL_RSTLEN_MASK         0x38
+#define WDT_CTL_RSPMOD_MASK         0x6
+#define WDT_CTL_EN_MASK             0x1
+
+#define WDT_CTL_RSTLEN_LSB          0x3
+#define WDT_CTL_RSPMOD_LSB          0x1
+#define WDT_CTL_EN_LSB              0
+
+#define WDT_FEED_VALUE              0x73
+//}}
+
 //RTC reg {{
 #define REG_RTC_BASE                PERIPHS_RTC_BASEADDR
 

components/esp8266/include/esp_task_wdt.h

@@ -0,0 +1,37 @@
+// Copyright 2018-2019 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#pragma once
+
+#include <stdbool.h>
+#include <stdint.h>
+#include "esp_err.h"
+
+/**
+  * @brief  Initialize the Task Watchdog Timer (TWDT)
+  *
+  * @return
+  *     - ESP_OK: Initialization was successful
+  *     - ESP_ERR_NO_MEM: Initialization failed due to lack of memory
+  *
+  * @note  esp_task_wdt_init() must only be called after the scheduler
+  *        started
+  */
+esp_err_t esp_task_wdt_init(void);
+
+/**
+  * @brief  Reset(Feed) the Task Watchdog Timer (TWDT) on behalf of the currently
+  *         running task
+  */
+void esp_task_wdt_reset(void);

components/esp8266/include/esp_wifi_osi.h

@@ -149,6 +149,8 @@ extern wifi_osi_funcs_t s_wifi_osi_funcs;
 #define wifi_rand() \
     s_wifi_osi_funcs.rand()
 
+void *osi_task_top_sp(void);
+
 #ifdef __cplusplus
 }
 #endif