1 /*
2 * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of the
7 * License, or any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
17 * 02110-1301, USA.
18 *
19 * You can also choose to distribute this program under the terms of
20 * the Unmodified Binary Distribution Licence (as given in the file
21 * COPYING.UBDL), provided that you have satisfied its requirements.
22 */
23
24 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
25
26 #include <assert.h>
27 #include <realmode.h>
28 #include <bios.h>
29 #include <biosint.h>
30 #include <ipxe/console.h>
31 #include <ipxe/ansiesc.h>
32 #include <ipxe/keys.h>
33 #include <ipxe/keymap.h>
34 #include <ipxe/init.h>
35 #include <config/console.h>
36
37 #define ATTR_BOLD 0x08
38
39 #define ATTR_FCOL_MASK 0x07
40 #define ATTR_FCOL_BLACK 0x00
41 #define ATTR_FCOL_BLUE 0x01
42 #define ATTR_FCOL_GREEN 0x02
43 #define ATTR_FCOL_CYAN 0x03
44 #define ATTR_FCOL_RED 0x04
45 #define ATTR_FCOL_MAGENTA 0x05
46 #define ATTR_FCOL_YELLOW 0x06
47 #define ATTR_FCOL_WHITE 0x07
48
49 #define ATTR_BLINK 0x80
50
51 #define ATTR_BCOL_MASK 0x70
52 #define ATTR_BCOL_BLACK 0x00
53 #define ATTR_BCOL_BLUE 0x10
54 #define ATTR_BCOL_GREEN 0x20
55 #define ATTR_BCOL_CYAN 0x30
56 #define ATTR_BCOL_RED 0x40
57 #define ATTR_BCOL_MAGENTA 0x50
58 #define ATTR_BCOL_YELLOW 0x60
59 #define ATTR_BCOL_WHITE 0x70
60
61 #define ATTR_DEFAULT ATTR_FCOL_WHITE
62
63 /* Set default console usage if applicable */
64 #if ! ( defined ( CONSOLE_PCBIOS ) && CONSOLE_EXPLICIT ( CONSOLE_PCBIOS ) )
65 #undef CONSOLE_PCBIOS
66 #define CONSOLE_PCBIOS ( CONSOLE_USAGE_ALL & ~CONSOLE_USAGE_LOG )
67 #endif
68
69 /** Current character attribute */
70 static unsigned int bios_attr = ATTR_DEFAULT;
71
72 /** Keypress injection lock */
73 static uint8_t __text16 ( bios_inject_lock );
74 #define bios_inject_lock __use_text16 ( bios_inject_lock )
75
76 /** Vector for chaining to other INT 16 handlers */
77 static struct segoff __text16 ( int16_vector );
78 #define int16_vector __use_text16 ( int16_vector )
79
80 /** Assembly wrapper */
81 extern void int16_wrapper ( void );
82
83 /**
84 * Handle ANSI CUP (cursor position)
85 *
86 * @v ctx ANSI escape sequence context
87 * @v count Parameter count
88 * @v params[0] Row (1 is top)
89 * @v params[1] Column (1 is left)
90 */
bios_handle_cup(struct ansiesc_context * ctx __unused,unsigned int count __unused,int params[])91 static void bios_handle_cup ( struct ansiesc_context *ctx __unused,
92 unsigned int count __unused, int params[] ) {
93 int cx = ( params[1] - 1 );
94 int cy = ( params[0] - 1 );
95
96 if ( cx < 0 )
97 cx = 0;
98 if ( cy < 0 )
99 cy = 0;
100
101 __asm__ __volatile__ ( REAL_CODE ( "int $0x10\n\t" )
102 : : "a" ( 0x0200 ), "b" ( 1 ),
103 "d" ( ( cy << 8 ) | cx ) );
104 }
105
106 /**
107 * Handle ANSI ED (erase in page)
108 *
109 * @v ctx ANSI escape sequence context
110 * @v count Parameter count
111 * @v params[0] Region to erase
112 */
bios_handle_ed(struct ansiesc_context * ctx __unused,unsigned int count __unused,int params[]__unused)113 static void bios_handle_ed ( struct ansiesc_context *ctx __unused,
114 unsigned int count __unused,
115 int params[] __unused ) {
116 /* We assume that we always clear the whole screen */
117 assert ( params[0] == ANSIESC_ED_ALL );
118
119 __asm__ __volatile__ ( REAL_CODE ( "int $0x10\n\t" )
120 : : "a" ( 0x0600 ), "b" ( bios_attr << 8 ),
121 "c" ( 0 ),
122 "d" ( ( ( console_height - 1 ) << 8 ) |
123 ( console_width - 1 ) ) );
124 }
125
126 /**
127 * Handle ANSI SGR (set graphics rendition)
128 *
129 * @v ctx ANSI escape sequence context
130 * @v count Parameter count
131 * @v params List of graphic rendition aspects
132 */
bios_handle_sgr(struct ansiesc_context * ctx __unused,unsigned int count,int params[])133 static void bios_handle_sgr ( struct ansiesc_context *ctx __unused,
134 unsigned int count, int params[] ) {
135 static const uint8_t bios_attr_fcols[10] = {
136 ATTR_FCOL_BLACK, ATTR_FCOL_RED, ATTR_FCOL_GREEN,
137 ATTR_FCOL_YELLOW, ATTR_FCOL_BLUE, ATTR_FCOL_MAGENTA,
138 ATTR_FCOL_CYAN, ATTR_FCOL_WHITE,
139 ATTR_FCOL_WHITE, ATTR_FCOL_WHITE /* defaults */
140 };
141 static const uint8_t bios_attr_bcols[10] = {
142 ATTR_BCOL_BLACK, ATTR_BCOL_RED, ATTR_BCOL_GREEN,
143 ATTR_BCOL_YELLOW, ATTR_BCOL_BLUE, ATTR_BCOL_MAGENTA,
144 ATTR_BCOL_CYAN, ATTR_BCOL_WHITE,
145 ATTR_BCOL_BLACK, ATTR_BCOL_BLACK /* defaults */
146 };
147 unsigned int i;
148 int aspect;
149
150 for ( i = 0 ; i < count ; i++ ) {
151 aspect = params[i];
152 if ( aspect == 0 ) {
153 bios_attr = ATTR_DEFAULT;
154 } else if ( aspect == 1 ) {
155 bios_attr |= ATTR_BOLD;
156 } else if ( aspect == 5 ) {
157 bios_attr |= ATTR_BLINK;
158 } else if ( aspect == 22 ) {
159 bios_attr &= ~ATTR_BOLD;
160 } else if ( aspect == 25 ) {
161 bios_attr &= ~ATTR_BLINK;
162 } else if ( ( aspect >= 30 ) && ( aspect <= 39 ) ) {
163 bios_attr &= ~ATTR_FCOL_MASK;
164 bios_attr |= bios_attr_fcols[ aspect - 30 ];
165 } else if ( ( aspect >= 40 ) && ( aspect <= 49 ) ) {
166 bios_attr &= ~ATTR_BCOL_MASK;
167 bios_attr |= bios_attr_bcols[ aspect - 40 ];
168 }
169 }
170 }
171
172 /**
173 * Handle ANSI DECTCEM set (show cursor)
174 *
175 * @v ctx ANSI escape sequence context
176 * @v count Parameter count
177 * @v params List of graphic rendition aspects
178 */
bios_handle_dectcem_set(struct ansiesc_context * ctx __unused,unsigned int count __unused,int params[]__unused)179 static void bios_handle_dectcem_set ( struct ansiesc_context *ctx __unused,
180 unsigned int count __unused,
181 int params[] __unused ) {
182 uint8_t height;
183
184 /* Get character height */
185 get_real ( height, BDA_SEG, BDA_CHAR_HEIGHT );
186
187 __asm__ __volatile__ ( REAL_CODE ( "int $0x10\n\t" )
188 : : "a" ( 0x0100 ),
189 "c" ( ( ( height - 2 ) << 8 ) |
190 ( height - 1 ) ) );
191 }
192
193 /**
194 * Handle ANSI DECTCEM reset (hide cursor)
195 *
196 * @v ctx ANSI escape sequence context
197 * @v count Parameter count
198 * @v params List of graphic rendition aspects
199 */
bios_handle_dectcem_reset(struct ansiesc_context * ctx __unused,unsigned int count __unused,int params[]__unused)200 static void bios_handle_dectcem_reset ( struct ansiesc_context *ctx __unused,
201 unsigned int count __unused,
202 int params[] __unused ) {
203
204 __asm__ __volatile__ ( REAL_CODE ( "int $0x10\n\t" )
205 : : "a" ( 0x0100 ), "c" ( 0x2000 ) );
206 }
207
208 /** BIOS console ANSI escape sequence handlers */
209 static struct ansiesc_handler bios_ansiesc_handlers[] = {
210 { ANSIESC_CUP, bios_handle_cup },
211 { ANSIESC_ED, bios_handle_ed },
212 { ANSIESC_SGR, bios_handle_sgr },
213 { ANSIESC_DECTCEM_SET, bios_handle_dectcem_set },
214 { ANSIESC_DECTCEM_RESET, bios_handle_dectcem_reset },
215 { 0, NULL }
216 };
217
218 /** BIOS console ANSI escape sequence context */
219 static struct ansiesc_context bios_ansiesc_ctx = {
220 .handlers = bios_ansiesc_handlers,
221 };
222
223 /**
224 * Print a character to BIOS console
225 *
226 * @v character Character to be printed
227 */
bios_putchar(int character)228 static void bios_putchar ( int character ) {
229 int discard_a, discard_b, discard_c;
230
231 /* Intercept ANSI escape sequences */
232 character = ansiesc_process ( &bios_ansiesc_ctx, character );
233 if ( character < 0 )
234 return;
235
236 /* Print character with attribute */
237 __asm__ __volatile__ ( REAL_CODE ( "pushl %%ebp\n\t" /* gcc bug */
238 /* Skip non-printable characters */
239 "cmpb $0x20, %%al\n\t"
240 "jb 1f\n\t"
241 /* Read attribute */
242 "movb %%al, %%cl\n\t"
243 "movb $0x08, %%ah\n\t"
244 "int $0x10\n\t"
245 "xchgb %%al, %%cl\n\t"
246 /* Skip if attribute matches */
247 "cmpb %%ah, %%bl\n\t"
248 "je 1f\n\t"
249 /* Set attribute */
250 "movw $0x0001, %%cx\n\t"
251 "movb $0x09, %%ah\n\t"
252 "int $0x10\n\t"
253 "\n1:\n\t"
254 /* Print character */
255 "xorw %%bx, %%bx\n\t"
256 "movb $0x0e, %%ah\n\t"
257 "int $0x10\n\t"
258 "popl %%ebp\n\t" /* gcc bug */ )
259 : "=a" ( discard_a ), "=b" ( discard_b ),
260 "=c" ( discard_c )
261 : "a" ( character ), "b" ( bios_attr ) );
262 }
263
264 /**
265 * Pointer to current ANSI output sequence
266 *
267 * While we are in the middle of returning an ANSI sequence for a
268 * special key, this will point to the next character to return. When
269 * not in the middle of such a sequence, this will point to a NUL
270 * (note: not "will be NULL").
271 */
272 static const char *bios_ansi_input = "";
273
274 /** A BIOS key */
275 struct bios_key {
276 /** Scancode */
277 uint8_t scancode;
278 /** Key code */
279 uint16_t key;
280 } __attribute__ (( packed ));
281
282 /** Mapping from BIOS scan codes to iPXE key codes */
283 static const struct bios_key bios_keys[] = {
284 { 0x53, KEY_DC },
285 { 0x48, KEY_UP },
286 { 0x50, KEY_DOWN },
287 { 0x4b, KEY_LEFT },
288 { 0x4d, KEY_RIGHT },
289 { 0x47, KEY_HOME },
290 { 0x4f, KEY_END },
291 { 0x49, KEY_PPAGE },
292 { 0x51, KEY_NPAGE },
293 { 0x3f, KEY_F5 },
294 { 0x40, KEY_F6 },
295 { 0x41, KEY_F7 },
296 { 0x42, KEY_F8 },
297 { 0x43, KEY_F9 },
298 { 0x44, KEY_F10 },
299 { 0x85, KEY_F11 },
300 { 0x86, KEY_F12 },
301 };
302
303 /**
304 * Get ANSI escape sequence corresponding to BIOS scancode
305 *
306 * @v scancode BIOS scancode
307 * @ret ansi_seq ANSI escape sequence, if any, otherwise NULL
308 */
bios_ansi_seq(unsigned int scancode)309 static const char * bios_ansi_seq ( unsigned int scancode ) {
310 static char buf[ 5 /* "[" + two digits + terminator + NUL */ ];
311 unsigned int key;
312 unsigned int terminator;
313 unsigned int n;
314 unsigned int i;
315 char *tmp = buf;
316
317 /* Construct ANSI escape sequence for scancode, if known */
318 for ( i = 0 ; i < ( sizeof ( bios_keys ) /
319 sizeof ( bios_keys[0] ) ) ; i++ ) {
320
321 /* Look for matching scancode */
322 if ( bios_keys[i].scancode != scancode )
323 continue;
324
325 /* Construct escape sequence */
326 key = bios_keys[i].key;
327 n = KEY_ANSI_N ( key );
328 terminator = KEY_ANSI_TERMINATOR ( key );
329 *(tmp++) = '[';
330 if ( n )
331 tmp += sprintf ( tmp, "%d", n );
332 *(tmp++) = terminator;
333 *(tmp++) = '\0';
334 assert ( tmp <= &buf[ sizeof ( buf ) ] );
335 return buf;
336 }
337
338 DBG ( "Unrecognised BIOS scancode %02x\n", scancode );
339 return NULL;
340 }
341
342 /**
343 * Map a key
344 *
345 * @v character Character read from console
346 * @ret character Mapped character
347 */
bios_keymap(unsigned int character)348 static int bios_keymap ( unsigned int character ) {
349 struct key_mapping *mapping;
350
351 for_each_table_entry ( mapping, KEYMAP ) {
352 if ( mapping->from == character )
353 return mapping->to;
354 }
355 return character;
356 }
357
358 /**
359 * Get character from BIOS console
360 *
361 * @ret character Character read from console
362 */
bios_getchar(void)363 static int bios_getchar ( void ) {
364 uint16_t keypress;
365 unsigned int character;
366 const char *ansi_seq;
367
368 /* If we are mid-sequence, pass out the next byte */
369 if ( ( character = *bios_ansi_input ) ) {
370 bios_ansi_input++;
371 return character;
372 }
373
374 /* Do nothing if injection is in progress */
375 if ( bios_inject_lock )
376 return 0;
377
378 /* Read character from real BIOS console */
379 bios_inject_lock++;
380 __asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
381 "int $0x16\n\t"
382 "cli\n\t" )
383 : "=a" ( keypress )
384 : "a" ( 0x1000 ), "m" ( bios_inject_lock ) );
385 bios_inject_lock--;
386 character = ( keypress & 0xff );
387
388 /* If it's a normal character, just map and return it */
389 if ( character && ( character < 0x80 ) )
390 return bios_keymap ( character );
391
392 /* Otherwise, check for a special key that we know about */
393 if ( ( ansi_seq = bios_ansi_seq ( keypress >> 8 ) ) ) {
394 /* Start of escape sequence: return ESC (0x1b) */
395 bios_ansi_input = ansi_seq;
396 return 0x1b;
397 }
398
399 return 0;
400 }
401
402 /**
403 * Check for character ready to read from BIOS console
404 *
405 * @ret True Character available to read
406 * @ret False No character available to read
407 */
bios_iskey(void)408 static int bios_iskey ( void ) {
409 unsigned int discard_a;
410 unsigned int flags;
411
412 /* If we are mid-sequence, we are always ready */
413 if ( *bios_ansi_input )
414 return 1;
415
416 /* Do nothing if injection is in progress */
417 if ( bios_inject_lock )
418 return 0;
419
420 /* Otherwise check the real BIOS console */
421 bios_inject_lock++;
422 __asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
423 "int $0x16\n\t"
424 "pushfw\n\t"
425 "popw %w0\n\t"
426 "cli\n\t" )
427 : "=R" ( flags ), "=a" ( discard_a )
428 : "a" ( 0x1100 ), "m" ( bios_inject_lock ) );
429 bios_inject_lock--;
430 return ( ! ( flags & ZF ) );
431 }
432
433 /** BIOS console */
434 struct console_driver bios_console __console_driver = {
435 .putchar = bios_putchar,
436 .getchar = bios_getchar,
437 .iskey = bios_iskey,
438 .usage = CONSOLE_PCBIOS,
439 };
440
441 /**
442 * Inject keypresses
443 *
444 * @v ix86 Registers as passed to INT 16
445 */
bios_inject(struct i386_all_regs * ix86)446 static __asmcall void bios_inject ( struct i386_all_regs *ix86 ) {
447 unsigned int discard_a;
448 unsigned int scancode;
449 unsigned int i;
450 uint16_t keypress;
451 int key;
452
453 /* If this is a blocking call, then loop until the
454 * non-blocking variant of the call indicates that a keypress
455 * is available. Do this without acquiring the injection
456 * lock, so that injection may take place.
457 */
458 if ( ( ix86->regs.ah & ~0x10 ) == 0x00 ) {
459 __asm__ __volatile__ ( REAL_CODE ( "sti\n\t"
460 "\n1:\n\t"
461 "pushw %%ax\n\t"
462 "int $0x16\n\t"
463 "popw %%ax\n\t"
464 "jc 2f\n\t"
465 "jz 1b\n\t"
466 "\n2:\n\t"
467 "cli\n\t" )
468 : "=a" ( discard_a )
469 : "a" ( ix86->regs.eax | 0x0100 ),
470 "m" ( bios_inject_lock ) );
471 }
472
473 /* Acquire injection lock */
474 bios_inject_lock++;
475
476 /* Check for keypresses */
477 if ( iskey() ) {
478
479 /* Get key */
480 key = getkey ( 0 );
481
482 /* Reverse internal CR->LF mapping */
483 if ( key == '\n' )
484 key = '\r';
485
486 /* Convert to keypress */
487 keypress = ( ( key << 8 ) | key );
488
489 /* Handle special keys */
490 if ( key >= KEY_MIN ) {
491 for ( i = 0 ; i < ( sizeof ( bios_keys ) /
492 sizeof ( bios_keys[0] ) ) ; i++ ) {
493 if ( bios_keys[i].key == key ) {
494 scancode = bios_keys[i].scancode;
495 keypress = ( scancode << 8 );
496 break;
497 }
498 }
499 }
500
501 /* Inject keypress */
502 DBGC ( &bios_console, "BIOS injecting keypress %04x\n",
503 keypress );
504 __asm__ __volatile__ ( REAL_CODE ( "int $0x16\n\t" )
505 : "=a" ( discard_a )
506 : "a" ( 0x0500 ), "c" ( keypress ),
507 "m" ( bios_inject_lock ) );
508 }
509
510 /* Release injection lock */
511 bios_inject_lock--;
512 }
513
514 /**
515 * Start up keypress injection
516 *
517 */
bios_inject_startup(void)518 static void bios_inject_startup ( void ) {
519
520 /* Assembly wrapper to call bios_inject() */
521 __asm__ __volatile__ (
522 TEXT16_CODE ( "\nint16_wrapper:\n\t"
523 "pushfw\n\t"
524 "cmpb $0, %%cs:bios_inject_lock\n\t"
525 "jnz 1f\n\t"
526 VIRT_CALL ( bios_inject )
527 "\n1:\n\t"
528 "popfw\n\t"
529 "ljmp *%%cs:int16_vector\n\t" ) : );
530
531 /* Hook INT 16 */
532 hook_bios_interrupt ( 0x16, ( ( intptr_t ) int16_wrapper ),
533 &int16_vector );
534 }
535
536 /**
537 * Shut down keypress injection
538 *
539 * @v booting System is shutting down for OS boot
540 */
bios_inject_shutdown(int booting __unused)541 static void bios_inject_shutdown ( int booting __unused ) {
542
543 /* Unhook INT 16 */
544 unhook_bios_interrupt ( 0x16, ( ( intptr_t ) int16_wrapper ),
545 &int16_vector );
546 }
547
548 /** Keypress injection startup function */
549 struct startup_fn bios_inject_startup_fn __startup_fn ( STARTUP_NORMAL ) = {
550 .name = "bios_inject",
551 .startup = bios_inject_startup,
552 .shutdown = bios_inject_shutdown,
553 };
554