Use the new syscalls in init

apps/init.asm

@@ -1,6 +1,13 @@
 section .text
 global _start
 _start:
+    call gettid
+    cmp rax, 0
+    jne .continue ; shenanigans: init is tid 0 (which is normally reserved for the idle task)
+    mov rdi, shenanigans_label
+    call print
+    jmp .end
+.continue:
     mov rdi, welcome_label
     call print
     call next_line
@@ -8,13 +15,23 @@ _start:
     call sleep
     mov rdi, version_label
     call print
+    call get_version
+    mov rdi, uname
+    call print
+    call next_line
     call next_line
     mov rdi, 2000
     call sleep
     mov rdi, end_label
     call print
+.end:
     call exit
 
+gettid:
+    mov rax, 7
+    int 42h
+    ret
+
 sleep:
     mov rax, 2
     int 42h
@@ -54,12 +71,25 @@ exit:
     mov rax, 0
     int 42h
 
+get_version:
+    mov rdi, uname
+    mov rsi, 40
+    mov rax, 6
+    int 42h
+    ret
+
 section .rodata
 version_label:
-    db "You are running Luna version v0.7-beta", 0xA, 0
+    db "Your kernel version is ", 0
 welcome_label:
     db "Welcome to Luna!", 0xA, 0
 end_label:
     db "Press any key to restart.", 0xA, 0
+shenanigans_label:
+    db "SHENANIGANS: init is tid 0 (reserved for the idle task)", 0xA, 0
 newline:
-    db 0xA
+    db 0xA
+
+section .bss
+uname:
+    resb 40