[Add] laos base boot

laos/src/kernel/entry.S

@@ -8,13 +8,13 @@ _entry:
         # with a 4096-byte stack per CPU.
         # sp = stack0 + (hartid * 4096)
         la.global $sp, stack0
-        lu12i.w $a0, (1024*4 >> 12) & 0xfffff
-        addi.w $a0, $a0, 1024*4 & 0xfff
-        csrrd $a1, CPUID
-        addi.w $a1, $a1, 1
-        mul.w $a0, $a0, $a1
-        add.w $sp, $sp, $a0
+        lu12i.w   $a0, (1024*4 >> 12) & 0xfffff
+        addi.w    $a0, $a0, 1024*4 & 0xfff
+        csrrd     $a1, CPUID
+        addi.w    $a1, $a1, 1
+        mul.w     $a0, $a0, $a1
+        add.w     $sp, $sp, $a0
         # jump to start() in start.c
-        bl start
+        bl        start
 spin:
         b spin