实现中断与异常

riscv/interrupt.c

@@ -0,0 +1,13 @@
+
+
+#include "context.h"
+#include "head.h"
+
+void interrupt_entry(uint32_t irq_num) {
+  my_printf("interrupt_entry %d\n", irq_num);
+}
+
+void trap_entry(uint32_t irq_num) {
+  my_printf("trap_entry %d\n", irq_num);
+  write_csr(mscratch, 0xffffffff);
+}