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Annotation of qemu/roms/seabios/src/kbd.c, revision 1.1

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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