diff options
Diffstat (limited to 'contrib/syslinux-4.02/core/rawcon.inc')
| -rw-r--r-- | contrib/syslinux-4.02/core/rawcon.inc | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/core/rawcon.inc b/contrib/syslinux-4.02/core/rawcon.inc new file mode 100644 index 0000000..f0d434c --- /dev/null +++ b/contrib/syslinux-4.02/core/rawcon.inc @@ -0,0 +1,75 @@ +; +; writechr: Write a single character in AL to the console without +; mangling any registers. This does raw console writes, +; since some PXE BIOSes seem to interfere regular console I/O. +; +%if IS_ISOLINUX +writechr_full: +%else +writechr: +%endif + pushfd + push ds + push cs + pop ds + test byte [UsingVGA], 08h + jz .videook + call vgaclearmode +.videook: + call write_serial ; write to serial port if needed + test byte [DisplayCon],01h ; Write to screen? + jz .nothing + + pushad + mov bh,[BIOS_page] + push ax + mov ah,03h ; Read cursor position + int 10h + pop ax + cmp al,8 + je .bs + cmp al,13 + je .cr + cmp al,10 + je .lf + push dx + mov bh,[BIOS_page] + mov bl,07h ; White on black + mov cx,1 ; One only + mov ah,09h ; Write char and attribute + int 10h + pop dx + inc dl + cmp dl,[VidCols] + jna .curxyok + xor dl,dl +.lf: inc dh + cmp dh,[VidRows] + ja .scroll +.curxyok: mov bh,[BIOS_page] + mov ah,02h ; Set cursor position + int 10h +.ret: popad +.nothing: + pop ds + popfd + ret +.scroll: dec dh + mov bh,[BIOS_page] + mov ah,02h + int 10h + mov ax,0601h ; Scroll up one line + mov bh,[ScrollAttribute] + xor cx,cx + mov dx,[ScreenSize] ; The whole screen + int 10h + jmp short .ret +.cr: xor dl,dl + jmp short .curxyok +.bs: sub dl,1 + jnc .curxyok + mov dl,[VidCols] + sub dh,1 + jnc .curxyok + xor dh,dh + jmp short .curxyok |