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1.1 root 1: // 16bit code to handle keyboard requests.
2: //
3: // Copyright (C) 2008 Kevin O'Connor <[email protected]>
4: // Copyright (C) 2002 MandrakeSoft S.A.
5: //
6: // This file may be distributed under the terms of the GNU LGPLv3 license.
7:
8: #include "biosvar.h" // GET_BDA
9: #include "util.h" // debug_enter
10: #include "config.h" // CONFIG_*
11: #include "bregs.h" // struct bregs
12: #include "ps2port.h" // kbd_command
13:
14: // Bit definitions for BDA kbd_flag[012]
15: #define KF0_RSHIFT (1<<0)
16: #define KF0_LSHIFT (1<<1)
17: #define KF0_CTRLACTIVE (1<<2)
18: #define KF0_ALTACTIVE (1<<3)
19: #define KF0_SCROLLACTIVE (1<<4)
20: #define KF0_NUMACTIVE (1<<5)
21: #define KF0_CAPSACTIVE (1<<6)
22:
23: #define KF1_LCTRL (1<<0)
24: #define KF1_LALT (1<<1)
25: #define KF1_PAUSEACTIVE (1<<3)
26: #define KF1_SCROLL (1<<4)
27: #define KF1_NUM (1<<5)
28: #define KF1_CAPS (1<<6)
29:
30: #define KF2_LAST_E1 (1<<0)
31: #define KF2_LAST_E0 (1<<1)
32: #define KF2_RCTRL (1<<2)
33: #define KF2_RALT (1<<3)
34: #define KF2_101KBD (1<<4)
35:
36: void
37: kbd_setup()
38: {
39: dprintf(3, "init keyboard\n");
40: u16 x = offsetof(struct bios_data_area_s, kbd_buf);
41: SET_BDA(kbd_flag2, KF2_101KBD);
42: SET_BDA(kbd_buf_head, x);
43: SET_BDA(kbd_buf_tail, x);
44: SET_BDA(kbd_buf_start_offset, x);
45:
46: SET_BDA(kbd_buf_end_offset
47: , x + FIELD_SIZEOF(struct bios_data_area_s, kbd_buf));
48: }
49:
50: static u8
51: enqueue_key(u8 scan_code, u8 ascii_code)
52: {
53: u16 buffer_start = GET_BDA(kbd_buf_start_offset);
54: u16 buffer_end = GET_BDA(kbd_buf_end_offset);
55:
56: u16 buffer_head = GET_BDA(kbd_buf_head);
57: u16 buffer_tail = GET_BDA(kbd_buf_tail);
58:
59: u16 temp_tail = buffer_tail;
60: buffer_tail += 2;
61: if (buffer_tail >= buffer_end)
62: buffer_tail = buffer_start;
63:
64: if (buffer_tail == buffer_head)
65: return 0;
66:
67: SET_FARVAR(SEG_BDA, *(u8*)(temp_tail+0), ascii_code);
68: SET_FARVAR(SEG_BDA, *(u8*)(temp_tail+1), scan_code);
69: SET_BDA(kbd_buf_tail, buffer_tail);
70: return 1;
71: }
72:
73: static void
74: dequeue_key(struct bregs *regs, int incr, int extended)
75: {
76: u16 buffer_head;
77: u16 buffer_tail;
78: for (;;) {
79: buffer_head = GET_BDA(kbd_buf_head);
80: buffer_tail = GET_BDA(kbd_buf_tail);
81:
82: if (buffer_head != buffer_tail)
83: break;
84: if (!incr) {
85: regs->flags |= F_ZF;
86: return;
87: }
88: wait_irq();
89: }
90:
91: u8 ascii_code = GET_FARVAR(SEG_BDA, *(u8*)(buffer_head+0));
92: u8 scan_code = GET_FARVAR(SEG_BDA, *(u8*)(buffer_head+1));
93: if ((ascii_code == 0xF0 && scan_code != 0)
94: || (ascii_code == 0xE0 && !extended))
95: ascii_code = 0;
96: regs->ax = (scan_code << 8) | ascii_code;
97:
98: if (!incr) {
99: regs->flags &= ~F_ZF;
100: return;
101: }
102: u16 buffer_start = GET_BDA(kbd_buf_start_offset);
103: u16 buffer_end = GET_BDA(kbd_buf_end_offset);
104:
105: buffer_head += 2;
106: if (buffer_head >= buffer_end)
107: buffer_head = buffer_start;
108: SET_BDA(kbd_buf_head, buffer_head);
109: }
110:
111: // read keyboard input
112: static void
113: handle_1600(struct bregs *regs)
114: {
115: dequeue_key(regs, 1, 0);
116: }
117:
118: // check keyboard status
119: static void
120: handle_1601(struct bregs *regs)
121: {
122: dequeue_key(regs, 0, 0);
123: }
124:
125: // get shift flag status
126: static void
127: handle_1602(struct bregs *regs)
128: {
129: regs->al = GET_BDA(kbd_flag0);
130: }
131:
132: // store key-stroke into buffer
133: static void
134: handle_1605(struct bregs *regs)
135: {
136: regs->al = !enqueue_key(regs->ch, regs->cl);
137: }
138:
139: // GET KEYBOARD FUNCTIONALITY
140: static void
141: handle_1609(struct bregs *regs)
142: {
143: // bit Bochs Description
144: // 7 0 reserved
145: // 6 0 INT 16/AH=20h-22h supported (122-key keyboard support)
146: // 5 1 INT 16/AH=10h-12h supported (enhanced keyboard support)
147: // 4 1 INT 16/AH=0Ah supported
148: // 3 0 INT 16/AX=0306h supported
149: // 2 0 INT 16/AX=0305h supported
150: // 1 0 INT 16/AX=0304h supported
151: // 0 0 INT 16/AX=0300h supported
152: //
153: regs->al = 0x30;
154: }
155:
156: // GET KEYBOARD ID
157: static void
158: handle_160a(struct bregs *regs)
159: {
160: u8 param[2];
161: int ret = kbd_command(ATKBD_CMD_GETID, param);
162: if (ret) {
163: regs->bx = 0;
164: return;
165: }
166: regs->bx = (param[1] << 8) | param[0];
167: }
168:
169: // read MF-II keyboard input
170: static void
171: handle_1610(struct bregs *regs)
172: {
173: dequeue_key(regs, 1, 1);
174: }
175:
176: // check MF-II keyboard status
177: static void
178: handle_1611(struct bregs *regs)
179: {
180: dequeue_key(regs, 0, 1);
181: }
182:
183: // get extended keyboard status
184: static void
185: handle_1612(struct bregs *regs)
186: {
187: regs->al = GET_BDA(kbd_flag0);
188: regs->ah = ((GET_BDA(kbd_flag1) & ~(KF2_RCTRL|KF2_RALT))
189: | (GET_BDA(kbd_flag2) & (KF2_RCTRL|KF2_RALT)));
190: //BX_DEBUG_INT16("int16: func 12 sending %04x\n",AX);
191: }
192:
193: static void
194: handle_166f(struct bregs *regs)
195: {
196: if (regs->al == 0x08)
197: // unsupported, aka normal keyboard
198: regs->ah = 2;
199: }
200:
201: // keyboard capability check called by DOS 5.0+ keyb
202: static void
203: handle_1692(struct bregs *regs)
204: {
205: // function int16 ah=0x10-0x12 supported
206: regs->ah = 0x80;
207: }
208:
209: // 122 keys capability check called by DOS 5.0+ keyb
210: static void
211: handle_16a2(struct bregs *regs)
212: {
213: // don't change AH : function int16 ah=0x20-0x22 NOT supported
214: }
215:
216: static void
217: handle_16XX(struct bregs *regs)
218: {
219: warn_unimplemented(regs);
220: }
221:
222: static void
223: set_leds()
224: {
225: u8 shift_flags = (GET_BDA(kbd_flag0) >> 4) & 0x07;
226: u8 kbd_led = GET_BDA(kbd_led);
227: u8 led_flags = kbd_led & 0x07;
228: if (shift_flags == led_flags)
229: return;
230:
231: int ret = kbd_command(ATKBD_CMD_SETLEDS, &shift_flags);
232: if (ret)
233: // Error
234: return;
235: kbd_led = (kbd_led & ~0x07) | shift_flags;
236: SET_BDA(kbd_led, kbd_led);
237: }
238:
239: // INT 16h Keyboard Service Entry Point
240: void VISIBLE16
241: handle_16(struct bregs *regs)
242: {
243: debug_enter(regs, DEBUG_HDL_16);
244: if (! CONFIG_KEYBOARD)
245: return;
246:
247: // XXX - set_leds should be called from irq handler
248: set_leds();
249:
250: switch (regs->ah) {
251: case 0x00: handle_1600(regs); break;
252: case 0x01: handle_1601(regs); break;
253: case 0x02: handle_1602(regs); break;
254: case 0x05: handle_1605(regs); break;
255: case 0x09: handle_1609(regs); break;
256: case 0x0a: handle_160a(regs); break;
257: case 0x10: handle_1610(regs); break;
258: case 0x11: handle_1611(regs); break;
259: case 0x12: handle_1612(regs); break;
260: case 0x92: handle_1692(regs); break;
261: case 0xa2: handle_16a2(regs); break;
262: case 0x6f: handle_166f(regs); break;
263: default: handle_16XX(regs); break;
264: }
265: }
266:
267: #define none 0
268: #define MNUM KF0_NUMACTIVE
269: #define MCAP KF0_CAPSACTIVE
270:
271: static struct scaninfo {
272: u16 normal;
273: u16 shift;
274: u16 control;
275: u16 alt;
276: u8 lock_flags;
277: } scan_to_scanascii[] VAR16 = {
278: { none, none, none, none, none },
279: { 0x011b, 0x011b, 0x011b, 0x0100, none }, /* escape */
280: { 0x0231, 0x0221, none, 0x7800, none }, /* 1! */
281: { 0x0332, 0x0340, 0x0300, 0x7900, none }, /* 2@ */
282: { 0x0433, 0x0423, none, 0x7a00, none }, /* 3# */
283: { 0x0534, 0x0524, none, 0x7b00, none }, /* 4$ */
284: { 0x0635, 0x0625, none, 0x7c00, none }, /* 5% */
285: { 0x0736, 0x075e, 0x071e, 0x7d00, none }, /* 6^ */
286: { 0x0837, 0x0826, none, 0x7e00, none }, /* 7& */
287: { 0x0938, 0x092a, none, 0x7f00, none }, /* 8* */
288: { 0x0a39, 0x0a28, none, 0x8000, none }, /* 9( */
289: { 0x0b30, 0x0b29, none, 0x8100, none }, /* 0) */
290: { 0x0c2d, 0x0c5f, 0x0c1f, 0x8200, none }, /* -_ */
291: { 0x0d3d, 0x0d2b, none, 0x8300, none }, /* =+ */
292: { 0x0e08, 0x0e08, 0x0e7f, none, none }, /* backspace */
293: { 0x0f09, 0x0f00, none, none, none }, /* tab */
294: { 0x1071, 0x1051, 0x1011, 0x1000, MCAP }, /* Q */
295: { 0x1177, 0x1157, 0x1117, 0x1100, MCAP }, /* W */
296: { 0x1265, 0x1245, 0x1205, 0x1200, MCAP }, /* E */
297: { 0x1372, 0x1352, 0x1312, 0x1300, MCAP }, /* R */
298: { 0x1474, 0x1454, 0x1414, 0x1400, MCAP }, /* T */
299: { 0x1579, 0x1559, 0x1519, 0x1500, MCAP }, /* Y */
300: { 0x1675, 0x1655, 0x1615, 0x1600, MCAP }, /* U */
301: { 0x1769, 0x1749, 0x1709, 0x1700, MCAP }, /* I */
302: { 0x186f, 0x184f, 0x180f, 0x1800, MCAP }, /* O */
303: { 0x1970, 0x1950, 0x1910, 0x1900, MCAP }, /* P */
304: { 0x1a5b, 0x1a7b, 0x1a1b, none, none }, /* [{ */
305: { 0x1b5d, 0x1b7d, 0x1b1d, none, none }, /* ]} */
306: { 0x1c0d, 0x1c0d, 0x1c0a, none, none }, /* Enter */
307: { none, none, none, none, none }, /* L Ctrl */
308: { 0x1e61, 0x1e41, 0x1e01, 0x1e00, MCAP }, /* A */
309: { 0x1f73, 0x1f53, 0x1f13, 0x1f00, MCAP }, /* S */
310: { 0x2064, 0x2044, 0x2004, 0x2000, MCAP }, /* D */
311: { 0x2166, 0x2146, 0x2106, 0x2100, MCAP }, /* F */
312: { 0x2267, 0x2247, 0x2207, 0x2200, MCAP }, /* G */
313: { 0x2368, 0x2348, 0x2308, 0x2300, MCAP }, /* H */
314: { 0x246a, 0x244a, 0x240a, 0x2400, MCAP }, /* J */
315: { 0x256b, 0x254b, 0x250b, 0x2500, MCAP }, /* K */
316: { 0x266c, 0x264c, 0x260c, 0x2600, MCAP }, /* L */
317: { 0x273b, 0x273a, none, none, none }, /* ;: */
318: { 0x2827, 0x2822, none, none, none }, /* '" */
319: { 0x2960, 0x297e, none, none, none }, /* `~ */
320: { none, none, none, none, none }, /* L shift */
321: { 0x2b5c, 0x2b7c, 0x2b1c, none, none }, /* |\ */
322: { 0x2c7a, 0x2c5a, 0x2c1a, 0x2c00, MCAP }, /* Z */
323: { 0x2d78, 0x2d58, 0x2d18, 0x2d00, MCAP }, /* X */
324: { 0x2e63, 0x2e43, 0x2e03, 0x2e00, MCAP }, /* C */
325: { 0x2f76, 0x2f56, 0x2f16, 0x2f00, MCAP }, /* V */
326: { 0x3062, 0x3042, 0x3002, 0x3000, MCAP }, /* B */
327: { 0x316e, 0x314e, 0x310e, 0x3100, MCAP }, /* N */
328: { 0x326d, 0x324d, 0x320d, 0x3200, MCAP }, /* M */
329: { 0x332c, 0x333c, none, none, none }, /* ,< */
330: { 0x342e, 0x343e, none, none, none }, /* .> */
331: { 0x352f, 0x353f, none, none, none }, /* /? */
332: { none, none, none, none, none }, /* R Shift */
333: { 0x372a, 0x372a, none, none, none }, /* * */
334: { none, none, none, none, none }, /* L Alt */
335: { 0x3920, 0x3920, 0x3920, 0x3920, none }, /* space */
336: { none, none, none, none, none }, /* caps lock */
337: { 0x3b00, 0x5400, 0x5e00, 0x6800, none }, /* F1 */
338: { 0x3c00, 0x5500, 0x5f00, 0x6900, none }, /* F2 */
339: { 0x3d00, 0x5600, 0x6000, 0x6a00, none }, /* F3 */
340: { 0x3e00, 0x5700, 0x6100, 0x6b00, none }, /* F4 */
341: { 0x3f00, 0x5800, 0x6200, 0x6c00, none }, /* F5 */
342: { 0x4000, 0x5900, 0x6300, 0x6d00, none }, /* F6 */
343: { 0x4100, 0x5a00, 0x6400, 0x6e00, none }, /* F7 */
344: { 0x4200, 0x5b00, 0x6500, 0x6f00, none }, /* F8 */
345: { 0x4300, 0x5c00, 0x6600, 0x7000, none }, /* F9 */
346: { 0x4400, 0x5d00, 0x6700, 0x7100, none }, /* F10 */
347: { none, none, none, none, none }, /* Num Lock */
348: { none, none, none, none, none }, /* Scroll Lock */
349: { 0x4700, 0x4737, 0x7700, none, MNUM }, /* 7 Home */
350: { 0x4800, 0x4838, none, none, MNUM }, /* 8 UP */
351: { 0x4900, 0x4939, 0x8400, none, MNUM }, /* 9 PgUp */
352: { 0x4a2d, 0x4a2d, none, none, none }, /* - */
353: { 0x4b00, 0x4b34, 0x7300, none, MNUM }, /* 4 Left */
354: { 0x4c00, 0x4c35, none, none, MNUM }, /* 5 */
355: { 0x4d00, 0x4d36, 0x7400, none, MNUM }, /* 6 Right */
356: { 0x4e2b, 0x4e2b, none, none, none }, /* + */
357: { 0x4f00, 0x4f31, 0x7500, none, MNUM }, /* 1 End */
358: { 0x5000, 0x5032, none, none, MNUM }, /* 2 Down */
359: { 0x5100, 0x5133, 0x7600, none, MNUM }, /* 3 PgDn */
360: { 0x5200, 0x5230, none, none, MNUM }, /* 0 Ins */
361: { 0x5300, 0x532e, none, none, MNUM }, /* Del */
362: { none, none, none, none, none },
363: { none, none, none, none, none },
364: { 0x565c, 0x567c, none, none, none }, /* \| */
365: { 0x8500, 0x8700, 0x8900, 0x8b00, none }, /* F11 */
366: { 0x8600, 0x8800, 0x8a00, 0x8c00, none }, /* F12 */
367: };
368:
369: // Handle a scancode read from the ps2 port. Note that "noinline" is
370: // used to make sure the call to call16_simpint in process_key doesn't
371: // have the overhead of this function's stack.
372: static void noinline
373: __process_key(u8 scancode)
374: {
375: u8 flags0 = GET_BDA(kbd_flag0);
376: u8 flags1 = GET_BDA(kbd_flag1);
377: u8 flags2 = GET_BDA(kbd_flag2);
378:
379: if (flags2 & KF2_LAST_E1) {
380: // Part of "pause" key (sequence is e1 1d 45 e1 9d c5)
381: if ((scancode & ~0x80) == 0x1d)
382: // Second key of sequence
383: return;
384: // Third key of sequence - clear flag.
385: flags2 &= ~KF2_LAST_E1;
386: SET_BDA(kbd_flag2, flags2);
387:
388: if (scancode == 0xc5) {
389: // Final key in sequence.
390:
391: // XXX - do actual pause.
392: }
393: return;
394: }
395:
396: // XXX - PrtScr should cause int 0x05
397: // XXX - Ctrl+Break should cause int 0x1B
398: // XXX - SysReq should cause int 0x15/0x85
399:
400: switch (scancode) {
401: case 0x00:
402: dprintf(1, "KBD: int09 handler: AL=0\n");
403: return;
404:
405: case 0x3a: /* Caps Lock press */
406: flags0 ^= KF0_CAPSACTIVE;
407: flags1 |= KF1_CAPS;
408: break;
409: case 0xba: /* Caps Lock release */
410: flags1 &= ~KF1_CAPS;
411: break;
412:
413: case 0x2a: /* L Shift press */
414: flags0 |= KF0_LSHIFT;
415: break;
416: case 0xaa: /* L Shift release */
417: flags0 &= ~KF0_LSHIFT;
418: break;
419:
420: case 0x36: /* R Shift press */
421: flags0 |= KF0_RSHIFT;
422: break;
423: case 0xb6: /* R Shift release */
424: flags0 &= ~KF0_RSHIFT;
425: break;
426:
427: case 0x1d: /* Ctrl press */
428: flags0 |= KF0_CTRLACTIVE;
429: if (flags2 & KF2_LAST_E0)
430: flags2 |= KF2_RCTRL;
431: else
432: flags1 |= KF1_LCTRL;
433: break;
434: case 0x9d: /* Ctrl release */
435: flags0 &= ~KF0_CTRLACTIVE;
436: if (flags2 & KF2_LAST_E0)
437: flags2 &= ~KF2_RCTRL;
438: else
439: flags1 &= ~KF1_LCTRL;
440: break;
441:
442: case 0x38: /* Alt press */
443: flags0 |= KF0_ALTACTIVE;
444: if (flags2 & KF2_LAST_E0)
445: flags2 |= KF2_RALT;
446: else
447: flags1 |= KF1_LALT;
448: break;
449: case 0xb8: /* Alt release */
450: flags0 &= ~KF0_ALTACTIVE;
451: if (flags2 & KF2_LAST_E0)
452: flags2 &= ~KF2_RALT;
453: else
454: flags1 &= ~KF1_LALT;
455: break;
456:
457: case 0x45: /* Num Lock press */
458: flags1 |= KF1_NUM;
459: flags0 ^= KF0_NUMACTIVE;
460: break;
461: case 0xc5: /* Num Lock release */
462: flags1 &= ~KF1_NUM;
463: break;
464:
465: case 0x46: /* Scroll Lock press */
466: flags1 |= KF1_SCROLL;
467: flags0 ^= KF0_SCROLLACTIVE;
468: break;
469: case 0xc6: /* Scroll Lock release */
470: flags1 &= ~KF1_SCROLL;
471: break;
472:
473: case 0xe0:
474: // Extended key
475: flags2 |= KF2_LAST_E0;
476: SET_BDA(kbd_flag2, flags2);
477: return;
478: case 0xe1:
479: // Start of pause key sequence
480: flags2 |= KF2_LAST_E1;
481: break;
482:
483: default:
484: if (scancode & 0x80)
485: // toss key releases
486: break;
487: if (scancode == 0x53
488: && ((flags0 & (KF0_CTRLACTIVE|KF0_ALTACTIVE))
489: == (KF0_CTRLACTIVE|KF0_ALTACTIVE))) {
490: // Ctrl+alt+del - reset machine.
491: SET_BDA(soft_reset_flag, 0x1234);
492: reset_vector();
493: }
494: if (scancode >= ARRAY_SIZE(scan_to_scanascii)) {
495: dprintf(1, "KBD: int09h_handler(): unknown scancode read: 0x%02x!\n"
496: , scancode);
497: return;
498: }
499: u8 asciicode;
500: struct scaninfo *info = &scan_to_scanascii[scancode];
501: if (flags0 & KF0_ALTACTIVE) {
502: asciicode = GET_GLOBAL(info->alt);
503: scancode = GET_GLOBAL(info->alt) >> 8;
504: } else if (flags0 & KF0_CTRLACTIVE) {
505: asciicode = GET_GLOBAL(info->control);
506: scancode = GET_GLOBAL(info->control) >> 8;
507: } else if (flags2 & KF2_LAST_E0
508: && scancode >= 0x47 && scancode <= 0x53) {
509: /* extended keys handling */
510: asciicode = 0xe0;
511: scancode = GET_GLOBAL(info->normal) >> 8;
512: } else if (flags0 & (KF0_RSHIFT|KF0_LSHIFT)) {
513: /* check if lock state should be ignored because a SHIFT
514: * key is pressed */
515:
516: if (flags0 & GET_GLOBAL(info->lock_flags)) {
517: asciicode = GET_GLOBAL(info->normal);
518: scancode = GET_GLOBAL(info->normal) >> 8;
519: } else {
520: asciicode = GET_GLOBAL(info->shift);
521: scancode = GET_GLOBAL(info->shift) >> 8;
522: }
523: } else {
524: /* check if lock is on */
525: if (flags0 & GET_GLOBAL(info->lock_flags)) {
526: asciicode = GET_GLOBAL(info->shift);
527: scancode = GET_GLOBAL(info->shift) >> 8;
528: } else {
529: asciicode = GET_GLOBAL(info->normal);
530: scancode = GET_GLOBAL(info->normal) >> 8;
531: }
532: }
533: if (scancode==0 && asciicode==0)
534: dprintf(1, "KBD: scancode & asciicode are zero?\n");
535: enqueue_key(scancode, asciicode);
536: break;
537: }
538: flags2 &= ~KF2_LAST_E0;
539:
540: SET_BDA(kbd_flag0, flags0);
541: SET_BDA(kbd_flag1, flags1);
542: SET_BDA(kbd_flag2, flags2);
543: }
544:
545: void
546: process_key(u8 key)
547: {
548: if (!CONFIG_KEYBOARD)
549: return;
550:
551: if (CONFIG_KBD_CALL_INT15_4F) {
552: // allow for keyboard intercept
553: u32 eax = (0x4f << 8) | key;
554: u32 flags;
555: call16_simpint(0x15, &eax, &flags);
556: if (!(flags & F_CF))
557: return;
558: key = eax;
559: }
560: __process_key(key);
561: }
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