Created
October 6, 2020 15:43
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Prints 16-bit register to COM1
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| .macro put_hex shift_by | |
| sar $\shift_by, %ax | |
| and $0xf, %ax | |
| cmp $0x9, %ax | |
| jg 1f | |
| /* If smaller or equal to 9 add 0x30 ('1' to '9', else 0x37 (small 'a')*/ | |
| add $0x30, %ax | |
| jmp 2f | |
| 1: | |
| add $0x37, %ax | |
| 2: | |
| out %al,(%dx) | |
| mov %cx, %ax | |
| .endm | |
| printHexShort: | |
| mov $0x3f8, %dx | |
| mov %ax, %cx | |
| put_hex 12 | |
| put_hex 8 | |
| put_hex 4 | |
| put_hex 0 /* Not optimal */ | |
| ret |
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