first commit

user/initcode.S

@@ -0,0 +1,28 @@
+# Initial process that execs /init.
+# This code runs in user space.
+
+#include "syscall.h"
+
+# exec(init, argv)
+.globl start
+start:
+        la a0, init
+        la a1, argv
+        li a7, SYS_exec
+        ecall
+
+# for(;;) exit();
+exit:
+        li a7, SYS_exit
+        ecall
+        jal exit
+
+# char init[] = "/init\0";
+init:
+  .string "/init\0"
+
+# char *argv[] = { init, 0 };
+.p2align 2
+argv:
+  .long init
+  .long 0