keyboard.c@ 82968

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1	/* $Id: keyboard.c 82968 2020-02-04 10:35:17Z vboxsync $ */
2	/** @file
3	* PC BIOS - ???
4	*/
5
6	/*
7	* Copyright (C) 2006-2020 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	* --------------------------------------------------------------------
17	*
18	* This code is based on:
19	*
20	* ROM BIOS for use with Bochs/Plex86/QEMU emulation environment
21	*
22	* Copyright (C) 2002 MandrakeSoft S.A.
23	*
24	* MandrakeSoft S.A.
25	* 43, rue d'Aboukir
26	* 75002 Paris - France
27	* http://www.linux-mandrake.com/
28	* http://www.mandrakesoft.com/
29	*
30	* This library is free software; you can redistribute it and/or
31	* modify it under the terms of the GNU Lesser General Public
32	* License as published by the Free Software Foundation; either
33	* version 2 of the License, or (at your option) any later version.
34	*
35	* This library is distributed in the hope that it will be useful,
36	* but WITHOUT ANY WARRANTY; without even the implied warranty of
37	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
38	* Lesser General Public License for more details.
39	*
40	* You should have received a copy of the GNU Lesser General Public
41	* License along with this library; if not, write to the Free Software
42	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
43	*
44	*/
45
46	/*
47	* Oracle LGPL Disclaimer: For the avoidance of doubt, except that if any license choice
48	* other than GPL or LGPL is available it will apply instead, Oracle elects to use only
49	* the Lesser General Public License version 2.1 (LGPLv2) at this time for any software where
50	* a choice of LGPL license versions is made available with the language indicating
51	* that LGPLv2 or any later version may be used, or where a choice of which version
52	* of the LGPL is applied is otherwise unspecified.
53	*/
54
55
56	#include <stdint.h>
57	#include "inlines.h"
58	#include "biosint.h"
59
60	#if DEBUG_INT16
61	# define BX_DEBUG_INT16(...) BX_DEBUG(__VA_ARGS__)
62	#else
63	# define BX_DEBUG_INT16(...)
64	#endif
65
66	extern void post(void);
67	#pragma aux post "*";
68
69	void jmp_post(void);
70	#pragma aux jmp_post = "jmp far ptr post" aborts;
71
72	extern void eoi_master_pic(void); /* in assembly code */
73	#pragma aux eoi_master_pic "*";
74
75	/* Manually save/restore BP around invoking user Ctrl-Break handler.
76	* The handler could conceivably clobber BP and the compiler does not
77	* believe us when we say 'modify [bp]' (BP is considered unalterable).
78	*/
79	void int_1b(void);
80	#pragma aux int_1b = \
81	"push bp" \
82	"int 1Bh" \
83	"pop bp" \
84	value [bp] modify [bp];
85
86
87	#define none 0
88	#define MAX_SCAN_CODE 0x58
89
90	struct {
91	uint16_t normal;
92	uint16_t shift;
93	uint16_t control;
94	uint16_t alt;
95	uint8_t lock_flags;
96	} static const scan_to_scanascii[MAX_SCAN_CODE + 1] = {
97	{ none, none, none, none, none },
98	{ 0x011b, 0x011b, 0x011b, 0x0100, none }, /* escape */
99	{ 0x0231, 0x0221, none, 0x7800, none }, /* 1! */
100	{ 0x0332, 0x0340, 0x0300, 0x7900, none }, /* 2@ */
101	{ 0x0433, 0x0423, none, 0x7a00, none }, /* 3# */
102	{ 0x0534, 0x0524, none, 0x7b00, none }, /* 4$ */
103	{ 0x0635, 0x0625, none, 0x7c00, none }, /* 5% */
104	{ 0x0736, 0x075e, 0x071e, 0x7d00, none }, /* 6^ */
105	{ 0x0837, 0x0826, none, 0x7e00, none }, /* 7& */
106	{ 0x0938, 0x092a, none, 0x7f00, none }, /* 8* */
107	{ 0x0a39, 0x0a28, none, 0x8000, none }, /* 9( */
108	{ 0x0b30, 0x0b29, none, 0x8100, none }, /* 0) */
109	{ 0x0c2d, 0x0c5f, 0x0c1f, 0x8200, none }, /* -_ */
110	{ 0x0d3d, 0x0d2b, none, 0x8300, none }, /* =+ */
111	{ 0x0e08, 0x0e08, 0x0e7f, none, none }, /* backspace */
112	{ 0x0f09, 0x0f00, none, none, none }, /* tab */
113	{ 0x1071, 0x1051, 0x1011, 0x1000, 0x40 }, /* Q */
114	{ 0x1177, 0x1157, 0x1117, 0x1100, 0x40 }, /* W */
115	{ 0x1265, 0x1245, 0x1205, 0x1200, 0x40 }, /* E */
116	{ 0x1372, 0x1352, 0x1312, 0x1300, 0x40 }, /* R */
117	{ 0x1474, 0x1454, 0x1414, 0x1400, 0x40 }, /* T */
118	{ 0x1579, 0x1559, 0x1519, 0x1500, 0x40 }, /* Y */
119	{ 0x1675, 0x1655, 0x1615, 0x1600, 0x40 }, /* U */
120	{ 0x1769, 0x1749, 0x1709, 0x1700, 0x40 }, /* I */
121	{ 0x186f, 0x184f, 0x180f, 0x1800, 0x40 }, /* O */
122	{ 0x1970, 0x1950, 0x1910, 0x1900, 0x40 }, /* P */
123	{ 0x1a5b, 0x1a7b, 0x1a1b, none, none }, /* [{ */
124	{ 0x1b5d, 0x1b7d, 0x1b1d, none, none }, /* ]} */
125	{ 0x1c0d, 0x1c0d, 0x1c0a, none, none }, /* Enter */
126	{ none, none, none, none, none }, /* L Ctrl */
127	{ 0x1e61, 0x1e41, 0x1e01, 0x1e00, 0x40 }, /* A */
128	{ 0x1f73, 0x1f53, 0x1f13, 0x1f00, 0x40 }, /* S */
129	{ 0x2064, 0x2044, 0x2004, 0x2000, 0x40 }, /* D */
130	{ 0x2166, 0x2146, 0x2106, 0x2100, 0x40 }, /* F */
131	{ 0x2267, 0x2247, 0x2207, 0x2200, 0x40 }, /* G */
132	{ 0x2368, 0x2348, 0x2308, 0x2300, 0x40 }, /* H */
133	{ 0x246a, 0x244a, 0x240a, 0x2400, 0x40 }, /* J */
134	{ 0x256b, 0x254b, 0x250b, 0x2500, 0x40 }, /* K */
135	{ 0x266c, 0x264c, 0x260c, 0x2600, 0x40 }, /* L */
136	{ 0x273b, 0x273a, none, none, none }, /* ;: */
137	{ 0x2827, 0x2822, none, none, none }, /* '" */
138	{ 0x2960, 0x297e, none, none, none }, /* `~ */
139	{ none, none, none, none, none }, /* L shift */
140	{ 0x2b5c, 0x2b7c, 0x2b1c, none, none }, /* \|\ */
141	{ 0x2c7a, 0x2c5a, 0x2c1a, 0x2c00, 0x40 }, /* Z */
142	{ 0x2d78, 0x2d58, 0x2d18, 0x2d00, 0x40 }, /* X */
143	{ 0x2e63, 0x2e43, 0x2e03, 0x2e00, 0x40 }, /* C */
144	{ 0x2f76, 0x2f56, 0x2f16, 0x2f00, 0x40 }, /* V */
145	{ 0x3062, 0x3042, 0x3002, 0x3000, 0x40 }, /* B */
146	{ 0x316e, 0x314e, 0x310e, 0x3100, 0x40 }, /* N */
147	{ 0x326d, 0x324d, 0x320d, 0x3200, 0x40 }, /* M */
148	{ 0x332c, 0x333c, none, none, none }, /* ,< */
149	{ 0x342e, 0x343e, none, none, none }, /* .> */
150	{ 0x352f, 0x353f, none, none, none }, /* /? */
151	{ none, none, none, none, none }, /* R Shift */
152	{ 0x372a, 0x372a, none, none, none }, /* * */
153	{ none, none, none, none, none }, /* L Alt */
154	{ 0x3920, 0x3920, 0x3920, 0x3920, none }, /* space */
155	{ none, none, none, none, none }, /* caps lock */
156	{ 0x3b00, 0x5400, 0x5e00, 0x6800, none }, /* F1 */
157	{ 0x3c00, 0x5500, 0x5f00, 0x6900, none }, /* F2 */
158	{ 0x3d00, 0x5600, 0x6000, 0x6a00, none }, /* F3 */
159	{ 0x3e00, 0x5700, 0x6100, 0x6b00, none }, /* F4 */
160	{ 0x3f00, 0x5800, 0x6200, 0x6c00, none }, /* F5 */
161	{ 0x4000, 0x5900, 0x6300, 0x6d00, none }, /* F6 */
162	{ 0x4100, 0x5a00, 0x6400, 0x6e00, none }, /* F7 */
163	{ 0x4200, 0x5b00, 0x6500, 0x6f00, none }, /* F8 */
164	{ 0x4300, 0x5c00, 0x6600, 0x7000, none }, /* F9 */
165	{ 0x4400, 0x5d00, 0x6700, 0x7100, none }, /* F10 */
166	{ none, none, none, none, none }, /* Num Lock */
167	{ none, none, none, none, none }, /* Scroll Lock */
168	{ 0x4700, 0x4737, 0x7700, none, 0x20 }, /* 7 Home */
169	{ 0x4800, 0x4838, none, none, 0x20 }, /* 8 UP */
170	{ 0x4900, 0x4939, 0x8400, none, 0x20 }, /* 9 PgUp */
171	{ 0x4a2d, 0x4a2d, none, none, none }, /* - */
172	{ 0x4b00, 0x4b34, 0x7300, none, 0x20 }, /* 4 Left */
173	{ 0x4c00, 0x4c35, none, none, 0x20 }, /* 5 */
174	{ 0x4d00, 0x4d36, 0x7400, none, 0x20 }, /* 6 Right */
175	{ 0x4e2b, 0x4e2b, none, none, none }, /* + */
176	{ 0x4f00, 0x4f31, 0x7500, none, 0x20 }, /* 1 End */
177	{ 0x5000, 0x5032, none, none, 0x20 }, /* 2 Down */
178	{ 0x5100, 0x5133, 0x7600, none, 0x20 }, /* 3 PgDn */
179	{ 0x5200, 0x5230, none, none, 0x20 }, /* 0 Ins */
180	{ 0x5300, 0x532e, none, none, 0x20 }, /* Del */
181	{ none, none, none, none, none },
182	{ none, none, none, none, none },
183	{ 0x565c, 0x567c, none, none, none }, /* \\| */
184	{ 0x8500, 0x8700, 0x8900, 0x8b00, none }, /* F11 */
185	{ 0x8600, 0x8800, 0x8a00, 0x8c00, none } /* F12 */
186	};
187
188
189	/* Keyboard initialization. */
190
191	//--------------------------------------------------------------------------
192	// keyboard_panic
193	//--------------------------------------------------------------------------
194	void keyboard_panic(uint16_t status)
195	{
196	// If you're getting a 993 keyboard panic here,
197	// please see the comment in keyboard_init
198
199	BX_PANIC("Keyboard error:%u\n",status);
200	}
201
202
203	//--------------------------------------------------------------------------
204	// keyboard_init
205	//--------------------------------------------------------------------------
206	// this file is based on LinuxBIOS implementation of keyboard.c
207	// could convert to #asm to gain space
208	void BIOSCALL keyboard_init(void)
209	{
210	uint16_t max;
211
212	/* ------------------- controller side ----------------------*/
213	/* send cmd = 0xAA, self test 8042 */
214	outb(0x64, 0xaa);
215
216	/* Wait until buffer is empty */
217	max=0xffff;
218	while ( (inb(0x64) & 0x02) && (--max>0)) outb(0x80, 0x00);
219	if (max==0x0) keyboard_panic(00);
220
221	/* Wait for data */
222	max=0xffff;
223	while ( ((inb(0x64) & 0x01) == 0) && (--max>0) ) outb(0x80, 0x01);
224	if (max==0x0) keyboard_panic(01);
225
226	/* read self-test result, 0x55 should be returned from 0x60 */
227	if ((inb(0x60) != 0x55)){
228	keyboard_panic(991);
229	}
230
231	/* send cmd = 0xAB, keyboard interface test */
232	outb(0x64,0xab);
233
234	/* Wait until buffer is empty */
235	max=0xffff;
236	while ((inb(0x64) & 0x02) && (--max>0)) outb(0x80, 0x10);
237	if (max==0x0) keyboard_panic(10);
238
239	/* Wait for data */
240	max=0xffff;
241	while ( ((inb(0x64) & 0x01) == 0) && (--max>0) ) outb(0x80, 0x11);
242	if (max==0x0) keyboard_panic(11);
243
244	/* read keyboard interface test result, */
245	/* 0x00 should be returned form 0x60 */
246	if ((inb(0x60) != 0x00)) {
247	keyboard_panic(992);
248	}
249
250	/* ------------------- keyboard side ------------------------*/
251	/* reset keyboard and self test (keyboard side) */
252	/* also enables the keyboard interface */
253	outb(0x60, 0xff);
254
255	/* Wait until buffer is empty */
256	max=0xffff;
257	while ((inb(0x64) & 0x02) && (--max>0)) outb(0x80, 0x20);
258	if (max==0x0) keyboard_panic(20);
259
260	/* Wait for data */
261	max=0xffff;
262	while ( ((inb(0x64) & 0x01) == 0) && (--max>0) ) outb(0x80, 0x21);
263	if (max==0x0) keyboard_panic(21);
264
265	/* keyboard should return ACK */
266	if ((inb(0x60) != 0xfa)) {
267	keyboard_panic(993);
268	}
269
270	/* Wait for reset to complete */
271	while ( (inb(0x64) & 0x01) == 0 ) outb(0x80, 0x31);
272
273	if ((inb(0x60) != 0xaa && inb(0x60) != 0xaa)) {
274	keyboard_panic(994);
275	}
276
277	/* Disable keyboard */
278	outb(0x60, 0xf5);
279
280	/* Wait until buffer is empty */
281	max=0xffff;
282	while ((inb(0x64) & 0x02) && (--max>0)) outb(0x80, 0x40);
283	if (max==0x0) keyboard_panic(40);
284
285	/* Wait for data */
286	max=0xffff;
287	while ( ((inb(0x64) & 0x01) == 0) && (--max>0) ) outb(0x80, 0x41);
288	if (max==0x0) keyboard_panic(41);
289
290	/* keyboard should return ACK */
291	if ((inb(0x60) != 0xfa)) {
292	keyboard_panic(995);
293	}
294
295	/* Write Keyboard Mode */
296	outb(0x64, 0x60);
297
298	/* Wait until buffer is empty */
299	max=0xffff;
300	while ((inb(0x64) & 0x02) && (--max>0)) outb(0x80, 0x50);
301	if (max==0x0) keyboard_panic(50);
302
303	/* send cmd: scan code convert, disable mouse, enable IRQ 1 */
304	outb(0x60, 0x65);
305
306	/* Wait until buffer is empty */
307	max=0xffff;
308	while ((inb(0x64) & 0x02) && (--max>0)) outb(0x80, 0x60);
309	if (max==0x0) keyboard_panic(60);
310
311	/* Enable keyboard */
312	outb(0x60, 0xf4);
313
314	/* Wait until buffer is empty */
315	max=0xffff;
316	while ((inb(0x64) & 0x02) && (--max>0)) outb(0x80, 0x70);
317	if (max==0x0) keyboard_panic(70);
318
319	/* Wait for data */
320	max=0xffff;
321	while ( ((inb(0x64) & 0x01) == 0) && (--max>0) ) outb(0x80, 0x71);
322	if (max==0x0) keyboard_panic(70);
323
324	/* keyboard should return ACK */
325	if ((inb(0x60) != 0xfa)) {
326	keyboard_panic(996);
327	}
328
329	/* Enable aux interface */
330	outb(0x64,0xa8);
331
332	/* While we're here, disable the A20 gate. Required for
333	* compatibility with the IBM PC and DOS.
334	*/
335	set_enable_a20(0);
336	}
337
338
339	unsigned int enqueue_key(uint8_t scan_code, uint8_t ascii_code)
340	{
341	uint16_t buffer_start, buffer_end, buffer_head, buffer_tail, temp_tail;
342
343	#if VBOX_BIOS_CPU >= 80286
344	buffer_start = read_word(0x0040, 0x0080);
345	buffer_end = read_word(0x0040, 0x0082);
346	#else
347	buffer_start = 0x001E;
348	buffer_end = 0x003E;
349	#endif
350
351	buffer_head = read_word(0x0040, 0x001A);
352	buffer_tail = read_word(0x0040, 0x001C);
353
354	temp_tail = buffer_tail;
355	buffer_tail += 2;
356	if (buffer_tail >= buffer_end)
357	buffer_tail = buffer_start;
358
359	if (buffer_tail == buffer_head)
360	return(0);
361
362	write_byte(0x0040, temp_tail, ascii_code);
363	write_byte(0x0040, temp_tail+1, scan_code);
364	write_word(0x0040, 0x001C, buffer_tail);
365	return(1);
366	}
367
368
369	/* Keyboard hardware interrupt handler. */
370	/// @todo should this be declared as taking arguments at all?
371	void BIOSCALL int09_function(uint16_t ES, uint16_t DI, uint16_t SI, uint16_t BP, uint16_t SP,
372	uint16_t BX, uint16_t DX, uint16_t CX, uint16_t AX)
373	{
374	uint8_t scancode, asciicode, shift_flags;
375	uint8_t mf2_flags, mf2_state, flag;
376
377	//
378	// DS has been set to F000 before call
379	//
380
381
382	scancode = GET_AL();
383
384	if (scancode == 0) {
385	BX_INFO("KBD: int09 handler: AL=0\n");
386	return;
387	}
388
389	mf2_flags = read_byte(0x0040, 0x18);
390	mf2_state = read_byte(0x0040, 0x96);
391	shift_flags = read_byte(0x0040, 0x17);
392	asciicode = 0;
393
394	switch (scancode) {
395	case 0x3a: /* Caps Lock press */
396	shift_flags ^= 0x40;
397	write_byte(0x0040, 0x17, shift_flags);
398	mf2_flags \|= 0x40;
399	write_byte(0x0040, 0x18, mf2_flags);
400	break;
401	case 0xba: /* Caps Lock release */
402	mf2_flags &= ~0x40;
403	write_byte(0x0040, 0x18, mf2_flags);
404	break;
405
406	case 0x2a: /* L Shift press */
407	case 0xaa: /* L Shift release */
408	case 0x36: /* R Shift press */
409	case 0xb6: /* R Shift release */
410	/* If this was an extended (i.e. faked) key, leave flags alone. */
411	if (!(mf2_state & 0x02)) {
412	flag = (scancode & 0x7f) == 0x2a ? 0x02 : 0x01;
413	if (scancode & 0x80)
414	shift_flags &= ~flag;
415	else
416	shift_flags \|= flag;
417	write_byte(0x0040, 0x17, shift_flags);
418	}
419	break;
420
421	case 0x1d: /* Ctrl press */
422	if ((mf2_state & 0x01) == 0) {
423	shift_flags \|= 0x04;
424	write_byte(0x0040, 0x17, shift_flags);
425	if (mf2_state & 0x02) {
426	mf2_state \|= 0x04;
427	write_byte(0x0040, 0x96, mf2_state);
428	} else {
429	mf2_flags \|= 0x01;
430	write_byte(0x0040, 0x18, mf2_flags);
431	}
432	}
433	break;
434	case 0x9d: /* Ctrl release */
435	if ((mf2_state & 0x01) == 0) {
436	shift_flags &= ~0x04;
437	write_byte(0x0040, 0x17, shift_flags);
438	if (mf2_state & 0x02) {
439	mf2_state &= ~0x04;
440	write_byte(0x0040, 0x96, mf2_state);
441	} else {
442	mf2_flags &= ~0x01;
443	write_byte(0x0040, 0x18, mf2_flags);
444	}
445	}
446	break;
447
448	case 0x38: /* Alt press */
449	shift_flags \|= 0x08;
450	write_byte(0x0040, 0x17, shift_flags);
451	if (mf2_state & 0x02) {
452	mf2_state \|= 0x08;
453	write_byte(0x0040, 0x96, mf2_state);
454	} else {
455	mf2_flags \|= 0x02;
456	write_byte(0x0040, 0x18, mf2_flags);
457	}
458	break;
459	case 0xb8: /* Alt release */
460	shift_flags &= ~0x08;
461	write_byte(0x0040, 0x17, shift_flags);
462	if (mf2_state & 0x02) {
463	mf2_state &= ~0x08;
464	write_byte(0x0040, 0x96, mf2_state);
465	} else {
466	mf2_flags &= ~0x02;
467	write_byte(0x0040, 0x18, mf2_flags);
468	}
469	break;
470
471	case 0x45: /* Num Lock/Pause press */
472	if ((mf2_state & 0x03) == 0) {
473	/* Num Lock */
474	mf2_flags \|= 0x20;
475	write_byte(0x0040, 0x18, mf2_flags);
476	shift_flags ^= 0x20;
477	write_byte(0x0040, 0x17, shift_flags);
478	} else {
479	/* Pause */
480	mf2_flags \|= 0x08; /* Set the suspend flag */
481	write_byte(0x0040, 0x18, mf2_flags);
482
483	/* Enable keyboard and send EOI. */
484	outp(0x64, 0xae);
485	eoi_master_pic();
486
487	while (read_byte(0x0040, 0x18) & 0x08)
488	; /* Hold on and wait... */
489
490	/// @todo We will send EOI again (and enable keyboard) on the way out; we shouldn't
491	}
492	break;
493	case 0xc5: /* Num Lock/Pause release */
494	if ((mf2_state & 0x03) == 0) {
495	mf2_flags &= ~0x20;
496	write_byte(0x0040, 0x18, mf2_flags);
497	}
498	break;
499
500	case 0x46: /* Scroll Lock/Break press */
501	if (mf2_state & 0x02) { /* E0 prefix? */
502	/* Zap the keyboard buffer. */
503	write_word(0x0040, 0x001c, read_word(0x0040, 0x001a));
504
505	write_byte(0x0040, 0x71, 0x80); /* Set break flag */
506	outp(0x64, 0xae); /* Enable keyboard */
507	int_1b(); /* Invoke user handler */
508	enqueue_key(0, 0); /* Dummy key press*/
509	} else {
510	mf2_flags \|= 0x10;
511	write_byte(0x0040, 0x18, mf2_flags);
512	shift_flags ^= 0x10;
513	write_byte(0x0040, 0x17, shift_flags);
514	}
515	break;
516
517	case 0xc6: /* Scroll Lock/Break release */
518	if (!(mf2_state & 0x02)) { /* Only if no E0 prefix */
519	mf2_flags &= ~0x10;
520	write_byte(0x0040, 0x18, mf2_flags);
521	}
522	break;
523
524	case 0x54: /* SysRq press */
525	if (!(mf2_flags & 0x04)) { /* If not already down */
526	mf2_flags \|= 0x04;
527	write_byte(0x0040, 0x18, mf2_flags);
528	/// @todo EOI/enable kbd/enable interrupts/call INT 15h/8500h
529	}
530	break;
531
532	case 0xd4: /* SysRq release */
533	mf2_flags &= ~0x04;
534	write_byte(0x0040, 0x18, mf2_flags);
535	/// @todo EOI/enable kbd/enable interrupts/call INT 15h/8501h
536	break;
537
538	case 0x53: /* Del press */
539	if ((shift_flags & 0x0c) == 0x0c) {
540	/* Indicate a warm boot. */
541	write_word(0x0040,0x0072, 0x1234);
542	jmp_post();
543	}
544	/* fall through */
545
546	default:
547	/* Check if suspend flag set. */
548	if (mf2_flags & 0x08) {
549	/* Pause had been pressed. Clear suspend flag and do nothing. */
550	mf2_flags &= ~0x08;
551	write_byte(0x0040, 0x18, mf2_flags);
552	return;
553	}
554
555	if (scancode & 0x80) {
556	/* Set ack/resend flags if appropriate. */
557	if (scancode == 0xFA) {
558	flag = read_byte(0x0040, 0x97) \| 0x10;
559	write_byte(0x0040, 0x97, flag);
560	} else if (scancode == 0xFE) {
561	flag = read_byte(0x0040, 0x97) \| 0x20;
562	write_byte(0x0040, 0x97, flag);
563	}
564	break; /* toss key releases ... */
565	}
566	if (scancode > MAX_SCAN_CODE) {
567	BX_INFO("KBD: int09h_handler(): unknown scancode read: 0x%02x!\n", scancode);
568	return;
569	}
570	if (shift_flags & 0x08) { /* ALT */
571	asciicode = scan_to_scanascii[scancode].alt;
572	scancode = scan_to_scanascii[scancode].alt >> 8;
573	} else if (shift_flags & 0x04) { /* CONTROL */
574	asciicode = scan_to_scanascii[scancode].control;
575	scancode = scan_to_scanascii[scancode].control >> 8;
576	} else if (((mf2_state & 0x02) > 0) && ((scancode >= 0x47) && (scancode <= 0x53))) {
577	/* extended keys handling */
578	asciicode = 0xe0;
579	scancode = scan_to_scanascii[scancode].normal >> 8;
580	} else if (shift_flags & 0x03) { /* LSHIFT + RSHIFT */
581	/* check if lock state should be ignored
582	* because a SHIFT key are pressed */
583
584	if (shift_flags & scan_to_scanascii[scancode].lock_flags) {
585	asciicode = scan_to_scanascii[scancode].normal;
586	scancode = scan_to_scanascii[scancode].normal >> 8;
587	} else {
588	asciicode = scan_to_scanascii[scancode].shift;
589	scancode = scan_to_scanascii[scancode].shift >> 8;
590	}
591	} else {
592	/* check if lock is on */
593	if (shift_flags & scan_to_scanascii[scancode].lock_flags) {
594	asciicode = scan_to_scanascii[scancode].shift;
595	scancode = scan_to_scanascii[scancode].shift >> 8;
596	} else {
597	asciicode = scan_to_scanascii[scancode].normal;
598	scancode = scan_to_scanascii[scancode].normal >> 8;
599	}
600	}
601	if (scancode==0 && asciicode==0) {
602	BX_INFO("KBD: int09h_handler(): scancode & asciicode are zero?\n");
603	}
604	enqueue_key(scancode, asciicode);
605	break;
606	}
607	if ((scancode & 0x7f) != 0x1d) {
608	mf2_state &= ~0x01;
609	}
610	mf2_state &= ~0x02;
611	write_byte(0x0040, 0x96, mf2_state);
612	}
613
614	unsigned int dequeue_key(uint8_t __far scan_code, uint8_t __far ascii_code, unsigned incr)
615	{
616	uint16_t buffer_start, buffer_end, buffer_head, buffer_tail;
617	uint8_t acode, scode;
618
619	#if VBOX_BIOS_CPU >= 80286
620	buffer_start = read_word(0x0040, 0x0080);
621	buffer_end = read_word(0x0040, 0x0082);
622	#else
623	buffer_start = 0x001E;
624	buffer_end = 0x003E;
625	#endif
626
627	buffer_head = read_word(0x0040, 0x001a);
628	buffer_tail = read_word(0x0040, 0x001c);
629
630	if (buffer_head != buffer_tail) {
631	acode = read_byte(0x0040, buffer_head);
632	scode = read_byte(0x0040, buffer_head+1);
633	*ascii_code = acode;
634	*scan_code = scode;
635	BX_DEBUG_INT16("dequeue_key: ascii=%02x scan=%02x \n", acode, scode);
636
637	if (incr) {
638	buffer_head += 2;
639	if (buffer_head >= buffer_end)
640	buffer_head = buffer_start;
641	write_word(0x0040, 0x001a, buffer_head);
642	}
643	return(1);
644	}
645	else {
646	return(0);
647	}
648	}
649
650
651	/// @todo move somewhere else?
652	#define AX r.gr.u.r16.ax
653	#define BX r.gr.u.r16.bx
654	#define CX r.gr.u.r16.cx
655	#define DX r.gr.u.r16.dx
656	#define SI r.gr.u.r16.si
657	#define DI r.gr.u.r16.di
658	#define BP r.gr.u.r16.bp
659	#define SP r.gr.u.r16.sp
660	#define FLAGS r.ra.flags.u.r16.flags
661	#define IFLGS r.ifl
662
663	/* Interrupt 16h service implementation. */
664
665	void BIOSCALL int16_function(volatile kbd_regs_t r)
666	{
667	uint8_t scan_code, ascii_code, shift_flags, led_flags, count;
668	uint16_t kbd_code, max;
669
670	BX_DEBUG_INT16("int16: AX=%04x BX=%04x CX=%04x DX=%04x \n", AX, BX, CX, DX);
671
672	shift_flags = read_byte(0x0040, 0x17);
673	led_flags = read_byte(0x0040, 0x97);
674	if ((((shift_flags >> 4) & 0x07) ^ (led_flags & 0x07)) != 0) {
675	int_disable(); /// @todo interrupts should be disabled already??
676	outb(0x60, 0xed);
677	while ((inb(0x64) & 0x01) == 0) outb(0x80, 0x21);
678	if ((inb(0x60) == 0xfa)) {
679	led_flags &= 0xc8;
680	led_flags \|= ((shift_flags >> 4) & 0x07);
681	outb(0x60, led_flags & 0x07);
682	while ((inb(0x64) & 0x01) == 0)
683	outb(0x80, 0x21);
684	inb(0x60);
685	write_byte(0x0040, 0x97, led_flags);
686	}
687	int_enable();
688	}
689
690	switch (GET_AH()) {
691	case 0x00: /* read keyboard input */
692	if ( !dequeue_key(&scan_code, &ascii_code, 1) ) {
693	BX_PANIC("KBD: int16h: out of keyboard input\n");
694	}
695	if (scan_code !=0 && ascii_code == 0xF0)
696	ascii_code = 0;
697	else if (ascii_code == 0xE0)
698	ascii_code = 0;
699	AX = (scan_code << 8) \| ascii_code;
700	break;
701
702	case 0x01: /* check keyboard status */
703	/* Enable interrupts, preserve most flags. Some callers depend on that! */
704	FLAGS = IFLGS;
705	if ( !dequeue_key(&scan_code, &ascii_code, 0) ) {
706	SET_ZF();
707	return;
708	}
709	if (scan_code !=0 && ascii_code == 0xF0)
710	ascii_code = 0;
711	else if (ascii_code == 0xE0)
712	ascii_code = 0;
713	AX = (scan_code << 8) \| ascii_code;
714	CLEAR_ZF();
715	break;
716
717	case 0x02: /* get shift flag status */
718	shift_flags = read_byte(0x0040, 0x17);
719	SET_AL(shift_flags);
720	break;
721
722	case 0x05: /* store key-stroke into buffer */
723	if ( !enqueue_key(GET_CH(), GET_CL()) ) {
724	SET_AL(1);
725	}
726	else {
727	SET_AL(0);
728	}
729	break;
730
731	case 0x09: /* GET KEYBOARD FUNCTIONALITY */
732	// bit Bochs Description
733	// 7 0 reserved
734	// 6 0 INT 16/AH=20h-22h supported (122-key keyboard support)
735	// 5 1 INT 16/AH=10h-12h supported (enhanced keyboard support)
736	// 4 1 INT 16/AH=0Ah supported
737	// 3 0 INT 16/AX=0306h supported
738	// 2 0 INT 16/AX=0305h supported
739	// 1 0 INT 16/AX=0304h supported
740	// 0 0 INT 16/AX=0300h supported
741	//
742	SET_AL(0x30);
743	break;
744
745	case 0x0A: /* GET KEYBOARD ID */
746	count = 2;
747	kbd_code = 0x0;
748	/// @todo Might be better to just mask the KB interrupt
749	int_disable();
750	outb(0x60, 0xf2);
751	/* Wait for data */
752	max=0xffff;
753	while ( ((inb(0x64) & 0x01) == 0) && (--max>0) )
754	inb(0x80);
755	if (max>0x0) {
756	if ((inb(0x60) == 0xfa)) {
757	do {
758	max=0xffff;
759	while ( ((inb(0x64) & 0x01) == 0) && (--max>0) )
760	inb(0x80);
761	if (max>0x0) {
762	kbd_code >>= 8;
763	kbd_code \|= (inb(0x60) << 8);
764	}
765	} while (--count>0);
766	}
767	}
768	BX=kbd_code;
769	break;
770
771	case 0x10: /* read MF-II keyboard input */
772	if ( !dequeue_key(&scan_code, &ascii_code, 1) ) {
773	BX_PANIC("KBD: int16h: out of keyboard input\n");
774	}
775	if (scan_code !=0 && ascii_code == 0xF0)
776	ascii_code = 0;
777	AX = (scan_code << 8) \| ascii_code;
778	break;
779
780	case 0x11: /* check MF-II keyboard status */
781	/* Enable interrupts, preserve most flags. Some callers depend on that! */
782	FLAGS = IFLGS;
783	if ( !dequeue_key(&scan_code, &ascii_code, 0) ) {
784	SET_ZF();
785	return;
786	}
787	if (scan_code !=0 && ascii_code == 0xF0)
788	ascii_code = 0;
789	AX = (scan_code << 8) \| ascii_code;
790	CLEAR_ZF();
791	break;
792
793	case 0x12: /* get extended keyboard status */
794	shift_flags = read_byte(0x0040, 0x17);
795	SET_AL(shift_flags);
796	shift_flags = read_byte(0x0040, 0x18) & 0x73;
797	shift_flags \|= read_byte(0x0040, 0x96) & 0x0c;
798	SET_AH(shift_flags);
799	BX_DEBUG_INT16("int16: func 12 sending %04x\n",AX);
800	break;
801
802	case 0x92: /* keyboard capability check called by DOS 5.0+ keyb */
803	SET_AH(0x80); // function int16 ah=0x10-0x12 supported
804	break;
805
806	case 0xA2: /* 122 keys capability check called by DOS 5.0+ keyb */
807	// don't change AH : function int16 ah=0x20-0x22 NOT supported
808	break;
809
810	/// @todo what's the point of handling this??
811	#if 0
812	case 0x6F:
813	if (GET_AL() == 0x08)
814	SET_AH(0x02); // unsupported, aka normal keyboard
815	#endif
816
817	default:
818	BX_INFO("KBD: unsupported int 16h function %02x\n", GET_AH());
819	BX_INFO("AX=%04x BX=%04x CX=%04x DX=%04x \n", AX, BX, CX, DX);
820	}
821	BX_DEBUG_INT16("int16ex: AX=%04x BX=%04x CX=%04x DX=%04x \n", AX, BX, CX, DX);
822	}

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source: vbox/trunk/src/VBox/Devices/PC/BIOS/keyboard.c@ 82968

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