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compile-me
garritfra 5 years ago
parent
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8cc1702d17
  1. 42
      boot.asm

42
boot.asm

@ -1,32 +1,44 @@
BITS 16
main
start:
mov ax, 07C0h ; Set up 4K stack space after this bootloader
mov ax, 07C0h ; Set up 4K stack space after this bootloader
add ax, 288 ; (4096 + 512) / 16 bytes per paragraph
mov ss, ax
mov sp, 4096
mov ax, 07C0h ; Set data segment to where we're loaded
add ax, 1000
mov ds, ax
mov ax, 07C0h ; Set data segment to where we're loaded
add ax, 255
mov ds, ax
main_loop:
call read_char
jmp main_loop ; Jump here - infinite loop!
call read_char ; Read character
jmp main_loop ; Repeat
read_char:
mov ah, 0h ; Call Function "Read Char"
int 16h ; Execute Keyboard Services
mov ah, 0eh ; Call Function "Write char to TTY
int 10h ; Execute Video Services
cmp AL, 0x0d ; Insert new line, if keystroke was return
je new_line
text_string db 'Loading kernel', 0
ret
new_line:
mov AH, 03h ; Get Cursor position
int 10h
read_char:
mov ah, 0h
int 16h
mov ah, 0eh
int 10h
add DH, 1 ; Add 1 to cursor position
print_string: ; Routine: output string in SI to screen
mov AH, 02h ; Set Cursor to new position
int 10h
ret
print_string: ; Routine: output string in SI to screen
mov ah, 0Eh ; int 10h 'print char' function
.repeat:
@ -42,3 +54,5 @@ print_string: ; Routine: output string in SI to screen
times 510-($-$$) db 0 ; Pad remainder of boot sector with 0s
dw 0xAA55 ; The standard PC boot signature

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