add rega board interrupt process

Ubiquitous/XiUOS/arch/risc-v/rv32m1_vega/Makefile

@@ -1,3 +1,3 @@
-SRC_FILES :=  startup_RV32M1_ri5cy.S system_RV32M1_ri5cy.c interrupt.c
+SRC_FILES :=  startup_RV32M1_ri5cy.S interrupt_gcc.S system_RV32M1_ri5cy.c interrupt.c
 
 include $(KERNEL_ROOT)/compiler.mk

Ubiquitous/XiUOS/arch/risc-v/rv32m1_vega/interrupt.c

@@ -11,7 +11,7 @@
 #include <xs_base.h>
 #include <xs_isr.h>
 #include "fsl_common.h"
-
+#include <RV32M1_ri5cy.h>
 
 int ArchDisableHwIrq(uint32_t irq_num)
 {
@@ -45,6 +45,25 @@ void EnableLocalInterrupt(x_base oldstat)
   __enable_irq();
 }
 
-
+typedef void (*irq_handler_t)(void);
+extern const irq_handler_t isrTable[];
+
+void SystemIrqHandler(uint32_t mcause)
+{
+    uint32_t intNum;
+
+    if (mcause & 0x80000000) /* For external interrupt. */
+    {
+        intNum = mcause & 0x1FUL;
+
+        /* Clear pending flag in EVENT unit .*/
+        EVENT_UNIT->INTPTPENDCLEAR = (1U << intNum);
+
+        /* Now call the real irq handler for intNum */
+        isrManager.done->incCounter();
+        isrTable[intNum]();
+        isrManager.done->decCounter();
+    }
+}
 
 

Ubiquitous/XiUOS/arch/risc-v/rv32m1_vega/interrupt_gcc.S

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018/10/02     Bernard      The first version
+ */
+
+#include "boot.h"
+
+  .section      .text.entry
+  .align 2
+  .global IRQ_Handler
+IRQ_Handler:
+
+    SAVE_X_REGISTERS
+
+    mv  fp, sp
+
+    /* switch to interrupt stack */
+    la    sp, __stack
+
+    /* interrupt handle */
+
+    csrr  a0, mcause
+    csrr  a1, mepc
+    mv    a2, sp
+    call  SystemIrqHandler
+
+    /* switch to from thread stack */
+
+    mv  sp, fp
+    mv  a0, fp
+    call KTaskOsAssignAfterIrq
+    j SwitchKTaskContextExit
+