https://github.com/akkartik/mu/blob/master/305keyboard.subx 
  1 # Primitives for keyboard control.
  2 # Require Linux and a modern terminal.
  3 
  4 == code
  5 
  6 enable-keyboard-immediate-mode:
  7     # . prologue
  8     55/push-ebp
  9     89/<- %ebp 4/r32/esp
 10     # . save registers
 11     50/push-eax
 12     51/push-ecx
 13     52/push-edx
 14     53/push-ebx
 15     56/push-esi
 16     57/push-edi
 17     #
 18     (_maybe-open-terminal)
 19     # var terminal-info/esi: (addr termios)
 20     # termios is a type from the Linux kernel. We don't care how large it is.
 21     81 5/subop/subtract %esp 0x100/imm32
 22     89/<- %esi 4/r32/esp
 23     # ioctl(*Terminal-file-descriptor, TCGETS, terminal-info)
 24     89/<- %edx 6/r32/esi
 25     b9/copy-to-ecx 0x5401/imm32/TCGETS
 26     8b/-> *Terminal-file-descriptor 3/r32/ebx
 27     e8/call syscall_ioctl/disp32
 28     # terminal-info->c_iflags &= Keyboard-immediate-mode-iflags
 29 #?     (write-buffered Stderr "iflags before: ")
 30 #?     (write-int32-hex-buffered Stderr *esi)
 31 #?     (write-buffered Stderr Newline)
 32 #?     (flush Stderr)
 33     8b/-> *esi 0/r32/eax  # Termios-c_iflag
 34     23/and *Keyboard-immediate-mode-iflags 0/r32/eax
 35     89/<- *esi 0/r32/eax  # Termios-c_iflag
 36 #?     (write-buffered Stderr "iflags after: ")
 37 #?     (write-int32-hex-buffered Stderr *esi)
 38 #?     (write-buffered Stderr Newline)
 39 #?     (flush Stderr)
 40     # terminal-info->c_lflags &= Keyboard-immediate-mode-lflags
 41 #?     (write-buffered Stderr "lflags before: ")
 42 #?     (write-int32-hex-buffered Stderr *(esi+0xc))
 43 #?     (write-buffered Stderr Newline)
 44 #?     (flush Stderr)
 45     8b/-> *(esi+0xc) 0/r32/eax  # Termios-c_lflag
 46     23/and *Keyboard-immediate-mode-lflags 0/r32/eax
 47     89/<- *(esi+0xc) 0/r32/eax  # Termios-c_lflag
 48 #?     (write-buffered Stderr "lflags after: ")
 49 #?     (write-int32-hex-buffered Stderr *(esi+0xc))
 50 #?     (write-buffered Stderr Newline)
 51 #?     (flush Stderr)
 52     # ioctl(*Terminal-file-descriptor, TCSETS, terminal-info)
 53     89/<- %edx 6/r32/esi
 54     b9/copy-to-ecx 0x5402/imm32/TCSETS
 55     8b/-> *Terminal-file-descriptor 3/r32/ebx
 56     e8/call syscall_ioctl/disp32
 57 $enable-keyboard-immediate-mode:end:
 58     # . reclaim locals
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