mu - Soul of a tiny new machine. More thorough tests → More comprehensible and rewrite-friendly software → More resilient society.

	Commit message (Expand)	Author	Age	Files	Lines
*	6085	Kartik Agaram	2020-03-06	1	-17/+78
*	6083	Kartik Agaram	2020-03-06	1	-38/+38
*	6014	Kartik Agaram	2020-02-17	1	-1/+1
*	5924	Kartik Agaram	2020-01-27	1	-24/+24
*	5897 - rename comparison instructions	Kartik Agaram	2020-01-16	1	-21/+21
*	5883 - drop the `ref` keyword	Kartik Agaram	2020-01-12	1	-14/+14
*	5876 - address -> addr	Kartik Agaram	2020-01-03	1	-4/+4
*	5804	Kartik Agaram	2019-12-08	1	-25/+27
*	5790	Kartik Agaram	2019-12-05	1	-2/+2
*	5770	Kartik Agaram	2019-11-28	1	-1/+1
*	5769 - support uppercase hex in SubX	Kartik Agaram	2019-11-28	1	-8/+12
*	5714	Kartik Agaram	2019-10-25	1	-4/+2
*	5698	Kartik Agaram	2019-10-15	1	-34/+34
*	5668 - start reorg to permit syntax sugar in layers	Kartik Agaram	2019-09-19	1	-1/+1
*	5592 - switch register names to lowercase	Kartik Agaram	2019-08-26	1	-440/+440
*	desugar: parsing seems complete	Kartik Agaram	2019-08-25	1	-2/+2
*	5485 - promote SubX to top-level	Kartik Agaram	2019-07-27	1	-0/+874

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html> <head> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> <title>Mu - 102keyboard.subx</title> <meta name="Generator" content="Vim/8.1"> <meta name="plugin-version" content="vim8.1_v1"> <meta name="syntax" content="none"> <meta name="settings" content="number_lines,use_css,pre_wrap,no_foldcolumn,expand_tabs,line_ids,prevent_copy="> <meta name="colorscheme" content="minimal-dark"> <style type="text/css">  </style> <script type='text/javascript'>  </script> </head> <body onload='JumpToLine();'> <a href='https://github.com/akkartik/mu/blob/main/102keyboard.subx'>https://github.com/akkartik/mu/blob/main/102keyboard.subx</a> <pre id='vimCodeElement'> 1 # check keyboard for a key 2 # return 0 on no keypress or unrecognized key 3 # 4 # We need to do this in machine code because Mu doesn't have global variables 5 # yet (for the keyboard buffer). 6 7 == code 8 9 # Most keys correspond to their ASCII/Unicode values. 10 # TODO: Support for international keyboards and multi-byte Unicode. 11 # 12 # However there are some exceptions that have no assigned place in Unicode 13 # (and with good reason): 14 # 0x80 = left arrow ← 15 # 0x81 = down arrow ↓ 16 # 0x82 = up arrow ↑ 17 # 0x83 = right arrow → 18 # These code points are not used by Unicode and their semantics are agreed to 19 # be context-sensitive: <a href="https://en.wikipedia.org/wiki/C0_and_C1_control_codes#C1_controls.">https://en.wikipedia.org/wiki/C0_and_C1_control_codes#C1_controls.</a> 20 # Mu cannibalizes them in yet another non-standard way. 21 read-key: # kbd: (addr keyboard) -> result/eax: byte 22 # . prologue 23 55/push-ebp 24 89/<- %ebp 4/r32/esp 25 # . save registers 26 51/push-ecx 27 # result = 0 28 b8/copy-to-eax 0/imm32 29 # ecx = keyboard 30 8b/-> *(ebp+8) 1/r32/ecx 31 81 7/subop/compare %ecx 0/imm32 32 { 33 75/jump-if-!= break/disp8 34 # var buffer-byte-addr/ecx: (addr byte) 35 8b/-> *Keyboard-buffer:read 1/r32/CL 36 81 0/subop/add %ecx Keyboard-buffer:data/imm32 37 # var next-key/eax: byte = *buffer-byte-addr 38 8a/byte-> *ecx 0/r32/AL 39 # if (next-key != 0) lock and remove from keyboard buffer 40 81 7/subop/compare %eax 0/imm32 41 { 42 74/jump-if-= break/disp8 43 fa/disable-interrupts 44 c6 0/subop/copy-byte *ecx 0/imm8 45 ff 0/subop/increment *Keyboard-buffer:read 46 81 4/subop/and *Keyboard-buffer:read 0x0f/imm32 47 fb/enable-interrupts 48 } 49 # return 50 eb $read-key:end/disp8 51 } 52 # TODO: fake keyboard 53 $read-key:end: 54 # . restore registers 55 59/pop-to-ecx 56 # . epilogue 57 89/<- %esp 5/r32/ebp 58 5d/pop-to-ebp 59 c3/return </pre> </body> </html>