Initial Checkin

1 files changed, 48 insertions, 0 deletions

diff --git a/software/shared/init.c b/software/shared/init.c
new file mode 100644
index 0000000..ab790b2
--- /dev/null
+++ b/software/shared/init.c
@@ -0,0 +1,48 @@
+// See LICENSE for license details.
+
+#include <stdlib.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <unistd.h>
+
+#include "encoding.h"
+#include "shared.h"
+
+int main(void);
+
+#ifdef USE_PLIC
+extern void handle_m_ext_interrupt();
+#endif
+
+
+#ifdef USE_M_TIME
+extern void handle_m_time_interrupt();
+#endif
+
+
+void _init(void)
+{
+  
+  exit(main());
+}
+
+uintptr_t handle_trap(uintptr_t mcause, uintptr_t epc)
+{
+  if (0){
+#ifdef USE_PLIC
+  // External Machine-Level Interrupt from PLIC
+ }else if ((mcause & MCAUSE_INT) && ((mcause & MCAUSE_CAUSE)  == IRQ_M_EXT)) {
+    handle_m_ext_interrupt();
+#endif
+#ifdef USE_M_TIME
+  // External Machine-Level Interrupt from PLIC
+ }else if ((mcause & MCAUSE_INT) && ((mcause & MCAUSE_CAUSE)  == IRQ_M_TIMER)) {
+    handle_m_time_interrupt();
+#endif
+  }    
+  else{
+    write(1, "trap\n", 5);
+    _exit(1 + mcause);
+  }
+  return epc;
+}