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| 1 | %define com1 0x3f8 | |
| 2 | ||
| 3 | bootentry: cli | |
| 4 | mov ax,0x07c0 | |
| 5 | mov ds,ax | |
| 6 | mov ss,ax | |
| 7 | mov es,ax | |
| 8 | mov sp,0x0800 | |
| 9 | sti | |
| 10 | call setup_uart | |
| 11 | cld | |
| 12 | mov ax,0xb800 | |
| 13 | mov es,ax | |
| 14 | xor di,di | |
| 15 | mov si,fo | |
| 16 | mov ax,10 | |
| 17 | push ax | |
| 18 | pop cx | |
| 19 | rep movsw | |
| 20 | hang: mov dx,com1+3 | |
| 21 | in al,dx | |
| 22 | push ax | |
| 23 | and al,127 | |
| 24 | out dx,al ; disable DLAB | |
| 25 | mov dx,com1 | |
| 26 | mov al,'K' | |
| 27 | out dx,al | |
| 28 | pop ax | |
| 29 | add dx,3 | |
| 30 | out dx,al ; set LCR back | |
| 31 | jmp hang | |
| 32 | ||
| 33 | ||
| 34 | setup_uart: mov dx,com1+1 | |
| 35 | mov al,0 | |
| 36 | out dx,al | |
| 37 | ||
| 38 | mov dx,com1+3 | |
| 39 | mov al,0x80 | |
| 40 | out dx,al | |
| 41 | ||
| 42 | mov dx,com1 | |
| 43 | mov al,0x01 | |
| 44 | out dx,al | |
| 45 | ||
| 46 | mov dx,com1+1 | |
| 47 | mov al,0x00 | |
| 48 | out dx,al | |
| 49 | ||
| 50 | mov dx,com1+3 | |
| 51 | mov al,0x03 | |
| 52 | out dx,al | |
| 53 | ||
| 54 | mov dx,com1+2 | |
| 55 | mov al,0xC7 | |
| 56 | out dx,al | |
| 57 | ||
| 58 | mov dx,com1+4 | |
| 59 | mov al,0x0B | |
| 60 | out dx,al | |
| 61 | xor ax,ax | |
| 62 | xor dx,dx | |
| 63 | ret | |
| 64 | fo: db "H",0x0f,"e",0x0f,"y",0x0f," ",0x0f,"W",0x0f,"o",0x0f,"r",0x0f,"l",0x0f,"d",0x0f,"!",0x0f | |
| 65 | buffer: times 510-($-$$) db 0 | |
| 66 | signature: dd 0xAA55 |
