Try to implement guessgame

source/sing_boot_guess.s

@@ -0,0 +1,135 @@
+#generate 16-bit code
+.code16
+
+#hint the assembler that here is the executable code located
+.text
+.globl _start;
+#boot code entry
+_start:
+  welcome: .asciz "Welcome to this very fine Guessing game \n\r"  #here we define the string
+  enter_number: .asciz "Enter a number: \n"
+  lower_msg: .asciz "Your number is to low :( \n"   # 26
+  higher_msg: .asciz "Your number is to high :( \n" # 27
+  winner_msg: .asciz "Your are the CAMPION, :D \n"  # 26
+   .macro mWriteString str              #macro which calls a function to print a string
+      leaw  \str, %si
+      call .writeStringIn
+  .endm
+    #jmp _boot  
+    
+    # function to print the string
+   .writeStringIn:
+        lodsb
+        orb  %al, %al
+        jz   .writeStringOut
+        movb $0x0e, %ah
+        int  $0x10
+        jmp  .writeStringIn
+   .writeStringOut:
+   ret                         #jump to boot code
+    
+    mWriteString welcome
+
+/*
+guess:
+    call get_number
+    xor %ah, %ah
+    call string_to_int
+
+    cmp $5, %dx
+
+    jl if_lower # rax less then 50
+    je if_eg
+    jg if_higher
+  if_lower:
+    mWriteString lower_msg
+    jmp guess
+
+  if_higher: 
+    mWriteString higher_msg
+    jmp guess
+
+  if_eg:
+    mWriteString winner_msg                            #message length
+
+    hlt
+*/
+#_boot:
+#    mWriteString welcome
+
+
+
+#.type string_to_int, @function
+#string_to_int:
+  /* Converts a string to an integer. Returns the integer in %rax.
+   * %rax: Address of string to convert.
+   */
+ /*
+  push %bp
+  mov %sp, %bp
+ 
+  push %bx
+  push %cx
+ 
+  mov %ax, %dx
+ 
+  xor %ax, %ax
+
+  cmp $47, %dx
+  jl not_a_num
+  cmp $57, %dx
+  jg not_a_num
+                        # I multiply by 10 to shift the number one placement to the right to add the newest integer.
+  sub $48, %dx         # In ascii, numbers start at 0 = 48, 1 = 49, 2 = 50 and so on. So I subtract 48 to get the digit.
+  
+  not_a_num:
+  xor %dx, %dx
+
+  convertdone:
+ 
+  pop %cx
+  pop %bx
+ 
+  mov %bp, %sp
+  pop %bp
+  ret
+
+.type get_number, @function
+  get_number:
+  #    .enter_char:
+  #        mov $0, %ah
+  #        mov $0, %al
+  #        int $0x16 
+    
+  #        mov $0x0E, %ah
+  #        int $0x10
+
+  #        jmp .enter_char
+   
+    # save state before function
+    push %bp
+    mov %sp, %bp
+
+    push %bx
+    push %cx
+    # Start of function
+    mWriteString enter_number
+
+    mov $0, %ah
+    mov $0, %al
+    int $0x16 
+  
+    mov $0x0E, %ah
+    int $0x10
+
+    pop %cx
+    pop %bx
+
+    mov %bp, %sp
+    pop %bp
+    ret
+*/
+     #move to 510th byte from the start and append boot signature
+     . = _start + 510
+     .byte 0x55
+     .byte 0xaa