1 files changed, 38 insertions, 0 deletions
diff --git a/utils.asm b/utils.asm
new file mode 100644
index 0000000..39a2df3
--- /dev/null
+++ b/utils.asm
@@ -0,0 +1,38 @@
+section .data
+    ; escape code for clearing the screen
+    clear db 0x1B, '[2J', 0x1B, '[H', 0
+    clear_len equ $ - clear 
+
+section .bss
+    ; adress for syscall for write_byte wrapper
+    byte_to_write resb 1
+
+section .text
+    global write_byte
+    global clear_screen
+
+write_byte:
+    push rdi
+
+    mov byte [byte_to_write], al
+    mov rax, 1                      
+    mov rdi, 1                      
+    mov rsi, byte_to_write                
+    mov rdx, 1                
+    syscall                         
+
+    pop rdi
+    ret
+
+clear_screen:
+    push rdi
+
+    mov rax, 1                      
+    mov rdi, 1                      
+    mov rsi, clear                
+    mov rdx, clear_len                
+    syscall                         
+
+    pop rdi
+    ret
+