first commit

kernel/syscall.h

@@ -0,0 +1,22 @@
+// System call numbers
+#define SYS_fork    1
+#define SYS_exit    2
+#define SYS_wait    3
+#define SYS_pipe    4
+#define SYS_read    5
+#define SYS_kill    6
+#define SYS_exec    7
+#define SYS_fstat   8
+#define SYS_chdir   9
+#define SYS_dup    10
+#define SYS_getpid 11
+#define SYS_sbrk   12
+#define SYS_sleep  13
+#define SYS_uptime 14
+#define SYS_open   15
+#define SYS_write  16
+#define SYS_mknod  17
+#define SYS_unlink 18
+#define SYS_link   19
+#define SYS_mkdir  20
+#define SYS_close  21