OS/ThreadX: Fix interrupt control ordering and update changelog

Signed-off-by: Huaqi Fang <578567190@qq.com>

Author: fanghuaqi

OS/ThreadX/ports/nuclei/port.c

@@ -96,6 +96,7 @@ void PortThreadSwitch(void)
         __ASM volatile("csrrw sp, " STRINGIFY(CSR_MSCRATCHCSWL) ", sp");
         /* restore timer interrupt to origin kernel interrupt priority */
         ECLIC_SetLevelIRQ(SysTimer_IRQn, KERNEL_INTERRUPT_PRIORITY);
+        __RWMB();
     }
     /* Determine if the time-slice is active.  */
     if (_tx_timer_time_slice && _tx_thread_current_ptr) {
@@ -108,6 +109,7 @@ void PortThreadSwitch(void)
     _tx_thread_current_ptr -> tx_thread_run_count++;
     /* Clear Software IRQ, A MUST */
     SysTimer_ClearSWIRQ();
+    __RWMB();
 }
 
 void SetupSysTickInterrupt(void)
@@ -154,10 +156,11 @@ UINT _tx_thread_interrupt_control(UINT new_posture)
 
     if (new_posture == TX_INT_DISABLE) {
         // clear interrupt
-        temp = __RV_CSR_READ_CLEAR(CSR_MSTATUS, MSTATUS_MIE);
+        temp = __RV_CSR_READ_CLEAR(CSR_MSTATUS, MSTATUS_MIE) & MSTATUS_MIE;
     } else {
-        temp = __RV_CSR_SWAP(CSR_MSTATUS, new_posture);
+        temp = __RV_CSR_READ_SET(CSR_MSTATUS, MSTATUS_MIE) & MSTATUS_MIE;
     }
+    __RWMB();
     return (UINT)temp;
 }
 

doc/source/changelog.rst

@@ -137,6 +137,7 @@ This is release version of ``0.9.0`` of Nuclei SDK.
   - Fix ThreadX SMP port ``PortThreadSwitch`` function by adding memory barriers (``__RWMB()``) around ECLIC IRQ priority changes and stack pointer swaps to ensure proper ordering of memory operations on Nuclei 1000 series out-of-order processors, preventing potential race conditions in multi-core task switching
   - Fix ThreadX SMP port time-slice processing to run on every tick interrupt, enable trap SP swap setup for the primary hart when ECLICv2 is present, and correct a ``==`` typo in the SMP force-unprotect path ``_tx_thread_smp_force_unprotect``
   - Fix ThreadX SMP port by introducing ``_tx_find_ready_thread`` for shared ready-thread selection in GCC/IAR startup and ``PortThreadSwitch``, using ``tx_thread_smp_core_control`` as the ready-thread claim flag
+  - Fix ThreadX Nuclei port interrupt control and task switch ordering in ``port.c`` by preserving the previous ``MSTATUS.MIE`` state and adding ``__RWMB()`` barriers after interrupt priority restore and software interrupt clear
 
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