diff options
Diffstat (limited to 'src/bootloader/bios_functions/print.asm')
| -rw-r--r-- | src/bootloader/bios_functions/print.asm | 29 |
1 files changed, 14 insertions, 15 deletions
diff --git a/src/bootloader/bios_functions/print.asm b/src/bootloader/bios_functions/print.asm index d071cd9..303fa8f 100644 --- a/src/bootloader/bios_functions/print.asm +++ b/src/bootloader/bios_functions/print.asm @@ -1,25 +1,24 @@ -;TODO fix null problem, allow direct passes +;TODO fix null problem, allow passing value insted of pointer bios_print: -;push ax ; we need to use ax, so let's push it in case whoever called needs it pusha -mov ah, 0x0e ; tells bios we're in tty mode +mov ah, 0x0e .print_loop: -mov al, [bx] ; al is the char MEANT TO BE CX -cmp al, 0 ; compare the char we're about to print with null -je .fini ; if it is null, we gonna scoot the fuck outta here +mov al, [bx] +cmp al, 0 +je .fini test cx, cx ; if cx is zero, ascii, otherwise hex string jne .print_hex -int 0x10 ; bios call, actually prints the char +int 0x10 .print_hex_ret: -inc bx ; adds to the pointer -jmp .print_loop ; goes back to loop start +inc bx +jmp .print_loop .fini: -mov al, 0xd ; \r +mov al, 0xd int 0x10 -mov al, 0xa ; \n +mov al, 0xa int 0x10 popa ret @@ -32,7 +31,7 @@ int 0x10 mov al, 'x' int 0x10 -mov al, [bx] ; shift bits to get first nibble +mov al, [bx] shr al, 4 call .bios_print_nibble @@ -47,13 +46,13 @@ jmp .print_hex_ret .bios_print_nibble: -cmp al, 9 ; see if letter worthy +cmp al, 9 ja .print_hex_letter -add al, 0x30 ;'1' +add al, 0x30 int 0x10 ret .print_hex_letter: -add al, 0x57 ;'a' +add al, 0x57 int 0x10 ret |