36 lines
843 B
ArmAsm
36 lines
843 B
ArmAsm
/*
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Whenever you press a key up or down,
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the keyboard hex scancode is printed to the screen.
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Only changes in state are shown.
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Scancode tables: TODO: official specs?
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- http://flint.cs.yale.edu/cs422/doc/art-of-asm/pdf/APNDXC.PDF
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- https://en.wikipedia.org/wiki/Scancode
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TODO Where does the 0x60 come from?
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- http://wiki.osdev.org/I/O_Ports
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- http://stackoverflow.com/questions/14194798/is-there-a-specification-of-x86-i-o-port-assignment
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TODO Possible to do this with the interrupt table instead of `in`?
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TODO understand http://wiki.osdev.org/PS2_Keyboard
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*/
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#include "common.h"
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BEGIN
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CLEAR
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/* TODO why CLI makes no difference? We are not using interrupts? */
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/*cli*/
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loop:
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/* Store the scancode to al. */
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in $0x60, %al
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cmp %al, %cl
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jz loop
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mov %al, %cl
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PRINT_HEX <%al>
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PRINT_NEWLINE
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jmp loop
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