plaincon.inc

   1 ;
   2 ; writechr:     Write a single character in AL to the console without
   3 ;               mangling any registers; handle video pages correctly.
   4 ;
   5                 section .text
   6
   7 writechr:
   8                 call write_serial       ; write to serial port if needed
   9                 pushfd
  10                 test byte [cs:UsingVGA], 08h
  11                 jz .videook
  12                 call vgaclearmode
  13 .videook:
  14                 test byte [cs:DisplayCon], 01h
  15                 jz .nothing
  16                 pushad
  17                 mov ah,0Eh
  18                 mov bl,07h              ; attribute
  19                 mov bh,[cs:BIOS_page]   ; current page
  20                 int 10h
  21                 popad
  22 .nothing:
  23                 popfd
  24                 ret