1 /* $NetBSD: pcdisplay.c,v 1.47 2021/08/07 16:19:12 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1998 5 * Matthias Drochner. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: pcdisplay.c,v 1.47 2021/08/07 16:19:12 thorpej Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/kernel.h> 35 #include <sys/device.h> 36 #include <sys/malloc.h> 37 #include <sys/bus.h> 38 39 #include <dev/isa/isavar.h> 40 41 #include <dev/ic/mc6845reg.h> 42 #include <dev/ic/pcdisplayvar.h> 43 #include <dev/isa/pcdisplayvar.h> 44 45 #include <dev/ic/pcdisplay.h> 46 47 #include <dev/wscons/wsconsio.h> 48 #include <dev/wscons/wsdisplayvar.h> 49 50 #include "pcweasel.h" 51 #if NPCWEASEL > 0 52 #include <dev/isa/weaselreg.h> 53 #include <dev/isa/weaselvar.h> 54 #endif 55 56 struct pcdisplay_config { 57 struct pcdisplayscreen pcs; 58 struct pcdisplay_handle dc_ph; 59 int mono; 60 }; 61 62 struct pcdisplay_softc { 63 struct pcdisplay_config *sc_dc; 64 int nscreens; 65 #if NPCWEASEL > 0 66 struct weasel_handle sc_weasel; 67 #endif 68 }; 69 70 static int pcdisplayconsole, pcdisplay_console_attached; 71 static struct pcdisplay_config pcdisplay_console_dc; 72 73 int pcdisplay_match(device_t, cfdata_t, void *); 74 void pcdisplay_attach(device_t, device_t, void *); 75 76 static int pcdisplay_is_console(bus_space_tag_t); 77 static int pcdisplay_probe_col(bus_space_tag_t, bus_space_tag_t); 78 static int pcdisplay_probe_mono(bus_space_tag_t, bus_space_tag_t); 79 static void pcdisplay_init(struct pcdisplay_config *, 80 bus_space_tag_t, bus_space_tag_t, 81 int); 82 static int pcdisplay_allocattr(void *, int, int, int, long *); 83 84 CFATTACH_DECL_NEW(pcdisplay, sizeof(struct pcdisplay_softc), 85 pcdisplay_match, pcdisplay_attach, NULL, NULL); 86 87 const struct wsdisplay_emulops pcdisplay_emulops = { 88 pcdisplay_cursor, 89 pcdisplay_mapchar, 90 pcdisplay_putchar, 91 pcdisplay_copycols, 92 pcdisplay_erasecols, 93 pcdisplay_copyrows, 94 pcdisplay_eraserows, 95 pcdisplay_allocattr, 96 NULL, /* replaceattr */ 97 }; 98 99 const struct wsscreen_descr pcdisplay_scr = { 100 "80x25", 80, 25, 101 &pcdisplay_emulops, 102 0, 0, /* no font support */ 103 WSSCREEN_REVERSE, /* that's minimal... */ 104 NULL, /* modecookie */ 105 }; 106 107 const struct wsscreen_descr *_pcdisplay_scrlist[] = { 108 &pcdisplay_scr, 109 }; 110 111 const struct wsscreen_list pcdisplay_screenlist = { 112 sizeof(_pcdisplay_scrlist) / sizeof(struct wsscreen_descr *), 113 _pcdisplay_scrlist 114 }; 115 116 static int pcdisplay_ioctl(void *, void *, u_long, void *, int, struct lwp *); 117 static paddr_t pcdisplay_mmap(void *, void *, off_t, int); 118 static int pcdisplay_alloc_screen(void *, const struct wsscreen_descr *, 119 void **, int *, int *, long *); 120 static void pcdisplay_free_screen(void *, void *); 121 static int pcdisplay_show_screen(void *, void *, int, 122 void (*) (void *, int, int), void *); 123 124 const struct wsdisplay_accessops pcdisplay_accessops = { 125 pcdisplay_ioctl, 126 pcdisplay_mmap, 127 pcdisplay_alloc_screen, 128 pcdisplay_free_screen, 129 pcdisplay_show_screen, 130 NULL, /* load_font */ 131 NULL, /* pollc */ 132 NULL, /* scroll */ 133 }; 134 135 static int 136 pcdisplay_probe_col(bus_space_tag_t iot, bus_space_tag_t memt) 137 { 138 bus_space_handle_t memh, ioh_6845; 139 u_int16_t oldval, val; 140 141 if (bus_space_map(memt, 0xb8000, 0x8000, 0, &memh)) 142 return (0); 143 oldval = bus_space_read_2(memt, memh, 0); 144 bus_space_write_2(memt, memh, 0, 0xa55a); 145 val = bus_space_read_2(memt, memh, 0); 146 bus_space_write_2(memt, memh, 0, oldval); 147 bus_space_unmap(memt, memh, 0x8000); 148 if (val != 0xa55a) 149 return (0); 150 151 if (bus_space_map(iot, 0x3d0, 0x10, 0, &ioh_6845)) 152 return (0); 153 bus_space_unmap(iot, ioh_6845, 0x10); 154 155 return (1); 156 } 157 158 static int 159 pcdisplay_probe_mono(bus_space_tag_t iot, bus_space_tag_t memt) 160 { 161 bus_space_handle_t memh, ioh_6845; 162 u_int16_t oldval, val; 163 164 if (bus_space_map(memt, 0xb0000, 0x8000, 0, &memh)) 165 return (0); 166 oldval = bus_space_read_2(memt, memh, 0); 167 bus_space_write_2(memt, memh, 0, 0xa55a); 168 val = bus_space_read_2(memt, memh, 0); 169 bus_space_write_2(memt, memh, 0, oldval); 170 bus_space_unmap(memt, memh, 0x8000); 171 if (val != 0xa55a) 172 return (0); 173 174 if (bus_space_map(iot, 0x3b0, 0x10, 0, &ioh_6845)) 175 return (0); 176 bus_space_unmap(iot, ioh_6845, 0x10); 177 178 return (1); 179 } 180 181 static void 182 pcdisplay_init(struct pcdisplay_config *dc, bus_space_tag_t iot, 183 bus_space_tag_t memt, int mono) 184 { 185 struct pcdisplay_handle *ph = &dc->dc_ph; 186 int cpos; 187 188 ph->ph_iot = iot; 189 ph->ph_memt = memt; 190 dc->mono = mono; 191 192 if (bus_space_map(memt, mono ? 0xb0000 : 0xb8000, 0x8000, 193 BUS_SPACE_MAP_CACHEABLE, &ph->ph_memh)) 194 panic("pcdisplay_init: cannot map memory"); 195 if (bus_space_map(iot, mono ? 0x3b0 : 0x3d0, 0x10, 196 0, &ph->ph_ioh_6845)) 197 panic("pcdisplay_init: cannot map io"); 198 199 /* 200 * initialize the only screen 201 */ 202 dc->pcs.hdl = ph; 203 dc->pcs.type = &pcdisplay_scr; 204 dc->pcs.active = 1; 205 dc->pcs.mem = NULL; 206 207 cpos = pcdisplay_6845_read(ph, cursorh) << 8; 208 cpos |= pcdisplay_6845_read(ph, cursorl); 209 210 /* make sure we have a valid cursor position */ 211 if (cpos < 0 || cpos >= pcdisplay_scr.nrows * pcdisplay_scr.ncols) 212 cpos = 0; 213 214 dc->pcs.dispoffset = 0; 215 216 dc->pcs.cursorrow = cpos / pcdisplay_scr.ncols; 217 dc->pcs.cursorcol = cpos % pcdisplay_scr.ncols; 218 pcdisplay_cursor_init(&dc->pcs, 1); 219 } 220 221 int 222 pcdisplay_match(device_t parent, cfdata_t match, void *aux) 223 { 224 struct isa_attach_args *ia = aux; 225 int mono; 226 227 if (ISA_DIRECT_CONFIG(ia)) 228 return (0); 229 230 /* If values are hardwired to something that they can't be, punt. */ 231 if (ia->ia_nio < 1 || 232 (ia->ia_io[0].ir_addr != ISA_UNKNOWN_PORT && 233 ia->ia_io[0].ir_addr != 0x3d0 && 234 ia->ia_io[0].ir_addr != 0x3b0)) 235 return (0); 236 237 if (ia->ia_niomem < 1 || 238 (ia->ia_iomem[0].ir_addr != ISA_UNKNOWN_IOMEM && 239 ia->ia_iomem[0].ir_addr != 0xb8000 && 240 ia->ia_iomem[0].ir_addr != 0xb0000)) 241 return (0); 242 if (ia->ia_iomem[0].ir_size != 0 && 243 ia->ia_iomem[0].ir_size != 0x8000) 244 return (0); 245 246 if (ia->ia_nirq > 0 && 247 ia->ia_irq[0].ir_irq != ISA_UNKNOWN_IRQ) 248 return (0); 249 250 if (ia->ia_ndrq > 0 && 251 ia->ia_drq[0].ir_drq != ISA_UNKNOWN_DRQ) 252 return (0); 253 254 if (pcdisplay_is_console(ia->ia_iot)) 255 mono = pcdisplay_console_dc.mono; 256 else if (ia->ia_io[0].ir_addr != 0x3b0 && 257 ia->ia_iomem[0].ir_addr != 0xb0000 && 258 pcdisplay_probe_col(ia->ia_iot, ia->ia_memt)) 259 mono = 0; 260 else if (ia->ia_io[0].ir_addr != 0x3d0 && 261 ia->ia_iomem[0].ir_addr != 0xb8000 && 262 pcdisplay_probe_mono(ia->ia_iot, ia->ia_memt)) 263 mono = 1; 264 else 265 return (0); 266 267 ia->ia_nio = 1; 268 ia->ia_io[0].ir_addr = mono ? 0x3b0 : 0x3d0; 269 ia->ia_io[0].ir_size = 0x10; 270 271 ia->ia_niomem = 1; 272 ia->ia_iomem[0].ir_addr = mono ? 0xb0000 : 0xb8000; 273 ia->ia_iomem[0].ir_size = 0x8000; 274 275 ia->ia_nirq = 0; 276 ia->ia_ndrq = 0; 277 278 return (1); 279 } 280 281 void 282 pcdisplay_attach(device_t parent, device_t self, void *aux) 283 { 284 struct isa_attach_args *ia = aux; 285 struct pcdisplay_softc *sc = device_private(self); 286 int console; 287 struct pcdisplay_config *dc; 288 struct wsemuldisplaydev_attach_args aa; 289 290 printf("\n"); 291 292 console = pcdisplay_is_console(ia->ia_iot); 293 294 if (console) { 295 dc = &pcdisplay_console_dc; 296 sc->nscreens = 1; 297 pcdisplay_console_attached = 1; 298 } else { 299 dc = malloc(sizeof(struct pcdisplay_config), 300 M_DEVBUF, M_WAITOK); 301 if (ia->ia_io[0].ir_addr != 0x3b0 && 302 ia->ia_iomem[0].ir_addr != 0xb0000 && 303 pcdisplay_probe_col(ia->ia_iot, ia->ia_memt)) 304 pcdisplay_init(dc, ia->ia_iot, ia->ia_memt, 0); 305 else if (ia->ia_io[0].ir_addr != 0x3d0 && 306 ia->ia_iomem[0].ir_addr != 0xb8000 && 307 pcdisplay_probe_mono(ia->ia_iot, ia->ia_memt)) 308 pcdisplay_init(dc, ia->ia_iot, ia->ia_memt, 1); 309 else 310 panic("pcdisplay_attach: display disappeared"); 311 } 312 sc->sc_dc = dc; 313 314 #if NPCWEASEL > 0 315 /* 316 * If the display is monochrome, check to see if we have 317 * a PC-Weasel, and initialize its special features. 318 */ 319 if (dc->mono) { 320 sc->sc_weasel.wh_st = dc->dc_ph.ph_memt; 321 sc->sc_weasel.wh_sh = dc->dc_ph.ph_memh; 322 sc->sc_weasel.wh_parent = self; 323 weasel_isa_init(&sc->sc_weasel); 324 } 325 #endif /* NPCWEASEL > 0 */ 326 327 aa.console = console; 328 aa.scrdata = &pcdisplay_screenlist; 329 aa.accessops = &pcdisplay_accessops; 330 aa.accesscookie = sc; 331 332 config_found(self, &aa, wsemuldisplaydevprint, CFARGS_NONE); 333 } 334 335 336 int 337 pcdisplay_cnattach(bus_space_tag_t iot, bus_space_tag_t memt) 338 { 339 int mono; 340 341 if (pcdisplay_probe_col(iot, memt)) 342 mono = 0; 343 else if (pcdisplay_probe_mono(iot, memt)) 344 mono = 1; 345 else 346 return (ENXIO); 347 348 pcdisplay_init(&pcdisplay_console_dc, iot, memt, mono); 349 350 wsdisplay_cnattach(&pcdisplay_scr, &pcdisplay_console_dc, 351 pcdisplay_console_dc.pcs.cursorcol, 352 pcdisplay_console_dc.pcs.cursorrow, 353 FG_LIGHTGREY | BG_BLACK); 354 355 pcdisplayconsole = 1; 356 return (0); 357 } 358 359 static int 360 pcdisplay_is_console(bus_space_tag_t iot) 361 { 362 if (pcdisplayconsole && 363 !pcdisplay_console_attached && 364 bus_space_is_equal(iot, pcdisplay_console_dc.dc_ph.ph_iot)) 365 return (1); 366 return (0); 367 } 368 369 static int 370 pcdisplay_ioctl(void *v, void *vs, u_long cmd, 371 void *data, int flag, struct lwp *l) 372 { 373 /* 374 * XXX "do something!" 375 */ 376 return (EPASSTHROUGH); 377 } 378 379 static paddr_t 380 pcdisplay_mmap(void *v, void *vs, off_t offset, int prot) 381 { 382 return (-1); 383 } 384 385 static int 386 pcdisplay_alloc_screen(void *v, const struct wsscreen_descr *type, 387 void **cookiep, int *curxp, int *curyp, long *defattrp) 388 { 389 struct pcdisplay_softc *sc = v; 390 391 if (sc->nscreens > 0) 392 return (ENOMEM); 393 394 *cookiep = sc->sc_dc; 395 *curxp = 0; 396 *curyp = 0; 397 *defattrp = FG_LIGHTGREY | BG_BLACK; 398 sc->nscreens++; 399 return (0); 400 } 401 402 static void 403 pcdisplay_free_screen(void *v, void *cookie) 404 { 405 struct pcdisplay_softc *sc = v; 406 407 if (sc->sc_dc == &pcdisplay_console_dc) 408 panic("pcdisplay_free_screen: console"); 409 410 sc->nscreens--; 411 } 412 413 static int 414 pcdisplay_show_screen(void *v, void *cookie, int waitok, 415 void (*cb)(void *, int, int), void *cbarg) 416 { 417 #ifdef DIAGNOSTIC 418 struct pcdisplay_softc *sc = v; 419 420 if (cookie != sc->sc_dc) 421 panic("pcdisplay_show_screen: bad screen"); 422 #endif 423 return (0); 424 } 425 426 static int 427 pcdisplay_allocattr(void *id, int fg, int bg, int flags, long *attrp) 428 { 429 if (flags & WSATTR_REVERSE) 430 *attrp = FG_BLACK | BG_LIGHTGREY; 431 else 432 *attrp = FG_LIGHTGREY | BG_BLACK; 433 return (0); 434 } 435
Indexes created Sat Sep 20 22:09:52 GMT 2025