change(esp_hw_support): disable CPU wait-for-event mode on cpu start

Author: esp-wzh

components/esp_hw_support/include/esp_cpu.h

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2020-2024 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2020-2025 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -247,6 +247,16 @@ FORCE_INLINE_ATTR void esp_cpu_intr_set_mtvt_addr(const void *mtvt_addr)
 }
 #endif  //#if SOC_INT_CLIC_SUPPORTED
 
+#if SOC_CPU_SUPPORT_WFE
+/**
+ * @brief Disable the WFE (wait for event) feature for CPU.
+ */
+FORCE_INLINE_ATTR void rv_utils_disable_wfe_mode(void)
+{
+    rv_utils_wfe_mode_enable(false);
+}
+#endif
+
 #if SOC_CPU_HAS_FLEXIBLE_INTC
 /**
  * @brief Set the interrupt type of a particular interrupt

components/esp_system/port/cpu_start.c

@@ -218,7 +218,9 @@ void IRAM_ATTR call_start_cpu1(void)
      */
     esp_cpu_intr_set_mtvt_addr(&_mtvt_table);
 #endif
-
+#if SOC_CPU_SUPPORT_WFE
+    rv_utils_disable_wfe_mode();
+#endif
     ets_set_appcpu_boot_addr(0);
 
     bootloader_init_mem();
@@ -419,6 +421,9 @@ void IRAM_ATTR call_start_cpu0(void)
      */
     esp_cpu_intr_set_mtvt_addr(&_mtvt_table);
 #endif
+#if SOC_CPU_SUPPORT_WFE
+    rv_utils_disable_wfe_mode();
+#endif
 
     rst_reas[0] = esp_rom_get_reset_reason(0);
 #if !CONFIG_ESP_SYSTEM_SINGLE_CORE_MODE

components/riscv/include/esp_private/interrupt_clic.h

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2020-2024 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2020-2025 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -148,6 +148,20 @@ FORCE_INLINE_ATTR void rv_utils_set_mtvt(uint32_t mtvt_val)
     RV_WRITE_CSR(MTVT_CSR, mtvt_val);
 }
 
+#if SOC_CPU_SUPPORT_WFE
+/**
+ * @brief Set the MEXSTATUS_WFFEN value, used to enable/disable wait for event mode.
+ */
+FORCE_INLINE_ATTR void rv_utils_wfe_mode_enable(bool en)
+{
+    if (en) {
+        RV_SET_CSR(MEXSTATUS, MEXSTATUS_WFFEN);
+    } else {
+        RV_CLEAR_CSR(MEXSTATUS, MEXSTATUS_WFFEN);
+    }
+}
+#endif
+
 /**
  * @brief Get the current CPU raw interrupt level
  */

components/riscv/include/riscv/encoding.h

@@ -53,6 +53,14 @@
 #define MSTATUS_SXL         0x0000000C00000000
 #define MSTATUS64_SD        0x8000000000000000
 
+#define MEXSTATUS_SOFT_RST  0x00000003
+#define MEXSTATUS_LPMD      0x0000000C
+#define MEXSTATUS_WFFEN     0x00000010
+#define MEXSTATUS_EXPT_VLD  0x00000020
+#define MEXSTATUS_LOCKUP    0x00000040
+#define MEXSTATUS_NMISTS    0x00000080
+#define MEXSTATUS_BUSEER    0x00000100
+
 #define SSTATUS_UIE         0x00000001
 #define SSTATUS_SIE         0x00000002
 #define SSTATUS_UPIE        0x00000010

components/soc/esp32c5/include/soc/Kconfig.soc_caps.in

@@ -379,6 +379,10 @@ config SOC_CPU_HAS_FLEXIBLE_INTC
     bool
     default y
 
+config SOC_CPU_SUPPORT_WFE
+    bool
+    default y
+
 config SOC_INT_CLIC_SUPPORTED
     bool
     default y

components/soc/esp32c5/include/soc/soc_caps.h

@@ -153,6 +153,7 @@
 #define SOC_CPU_CORES_NUM               (1U)
 #define SOC_CPU_INTR_NUM                32
 #define SOC_CPU_HAS_FLEXIBLE_INTC       1
+#define SOC_CPU_SUPPORT_WFE             1
 #define SOC_INT_CLIC_SUPPORTED          1
 #define SOC_INT_HW_NESTED_SUPPORTED     1       // Support for hardware interrupts nesting
 #define SOC_BRANCH_PREDICTOR_SUPPORTED  1

components/soc/esp32c61/include/soc/Kconfig.soc_caps.in

@@ -215,6 +215,10 @@ config SOC_CPU_HAS_FLEXIBLE_INTC
     bool
     default y
 
+config SOC_CPU_SUPPORT_WFE
+    bool
+    default y
+
 config SOC_INT_PLIC_SUPPORTED
     bool
     default n

components/soc/esp32c61/include/soc/soc_caps.h

@@ -126,6 +126,7 @@
 #define SOC_CPU_CORES_NUM               (1U)
 #define SOC_CPU_INTR_NUM                32
 #define SOC_CPU_HAS_FLEXIBLE_INTC       1
+#define SOC_CPU_SUPPORT_WFE             1
 #define SOC_INT_PLIC_SUPPORTED          0       //riscv platform-level interrupt controller
 #define SOC_INT_CLIC_SUPPORTED          1
 #define SOC_INT_HW_NESTED_SUPPORTED     1       // Support for hardware interrupts nesting