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halt until exception when waiting for keyboard #54

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halt until exception when waiting for keyboard #54

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2 changes: 2 additions & 0 deletions 102keyboard.subx
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,8 @@ read-key: # kbd: (addr keyboard) -> result/eax: byte
89/<- %ebp 4/r32/esp
# . save registers
51/push-ecx
# wait for an interrupt to save power on Qemu
f4/hlt
# result = 0
b8/copy-to-eax 0/imm32
# ecx = keyboard
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