drivers/video/fbdev/uvesafb.c

   1 /*
   2  * A framebuffer driver for VBE 2.0+ compliant video cards
   3  *
   4  * (c) 2007 Michal Januszewski <spock@gentoo.org>
   5  *     Loosely based upon the vesafb driver.
   6  *
   7  */
   8
   9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  10
  11 #include <linux/init.h>
  12 #include <linux/module.h>
  13 #include <linux/moduleparam.h>
  14 #include <linux/skbuff.h>
  15 #include <linux/timer.h>
  16 #include <linux/completion.h>
  17 #include <linux/connector.h>
  18 #include <linux/random.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/limits.h>
  21 #include <linux/fb.h>
  22 #include <linux/io.h>
  23 #include <linux/mutex.h>
  24 #include <linux/slab.h>
  25 #include <video/edid.h>
  26 #include <video/uvesafb.h>
  27 #ifdef CONFIG_X86
  28 #include <video/vga.h>
  29 #endif
  30 #include "edid.h"
  31
  32 static struct cb_id uvesafb_cn_id = {
  33         .idx = CN_IDX_V86D,
  34         .val = CN_VAL_V86D_UVESAFB
  35 };
  36 static char v86d_path[PATH_MAX] = "/sbin/v86d";
  37 static char v86d_started;       /* has v86d been started by uvesafb? */
  38
  39 static const struct fb_fix_screeninfo uvesafb_fix = {
  40         .id     = "VESA VGA",
  41         .type   = FB_TYPE_PACKED_PIXELS,
  42         .accel  = FB_ACCEL_NONE,
  43         .visual = FB_VISUAL_TRUECOLOR,
  44 };
  45
  46 static int mtrr         = 3;    /* enable mtrr by default */
  47 static bool blank       = 1;    /* enable blanking by default */
  48 static int ypan         = 1;    /* 0: scroll, 1: ypan, 2: ywrap */
  49 static bool pmi_setpal  = true; /* use PMI for palette changes */
  50 static bool nocrtc;             /* ignore CRTC settings */
  51 static bool noedid;             /* don't try DDC transfers */
  52 static int vram_remap;          /* set amt. of memory to be used */
  53 static int vram_total;          /* set total amount of memory */
  54 static u16 maxclk;              /* maximum pixel clock */
  55 static u16 maxvf;               /* maximum vertical frequency */
  56 static u16 maxhf;               /* maximum horizontal frequency */
  57 static u16 vbemode;             /* force use of a specific VBE mode */
  58 static char *mode_option;
  59 static u8  dac_width    = 6;
  60
  61 static struct uvesafb_ktask *uvfb_tasks[UVESAFB_TASKS_MAX];
  62 static DEFINE_MUTEX(uvfb_lock);
  63
  64 /*
  65  * A handler for replies from userspace.
  66  *
  67  * Make sure each message passes consistency checks and if it does,
  68  * find the kernel part of the task struct, copy the registers and
  69  * the buffer contents and then complete the task.
  70  */
  71 static void uvesafb_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
  72 {
  73         struct uvesafb_task *utask;
  74         struct uvesafb_ktask *task;
  75
  76         if (!capable(CAP_SYS_ADMIN))
  77                 return;
  78
  79         if (msg->seq >= UVESAFB_TASKS_MAX)
  80                 return;
  81
  82         mutex_lock(&uvfb_lock);
  83         task = uvfb_tasks[msg->seq];
  84
  85         if (!task || msg->ack != task->ack) {
  86                 mutex_unlock(&uvfb_lock);
  87                 return;
  88         }
  89
  90         utask = (struct uvesafb_task *)msg->data;
  91
  92         /* Sanity checks for the buffer length. */
  93         if (task->t.buf_len < utask->buf_len ||
  94             utask->buf_len > msg->len - sizeof(*utask)) {
  95                 mutex_unlock(&uvfb_lock);
  96                 return;
  97         }
  98
  99         uvfb_tasks[msg->seq] = NULL;
 100         mutex_unlock(&uvfb_lock);
 101
 102         memcpy(&task->t, utask, sizeof(*utask));
 103
 104         if (task->t.buf_len && task->buf)
 105                 memcpy(task->buf, utask + 1, task->t.buf_len);
 106
 107         complete(task->done);
 108         return;
 109 }
 110
 111 static int uvesafb_helper_start(void)
 112 {
 113         char *envp[] = {
 114                 "HOME=/",
 115                 "PATH=/sbin:/bin",
 116                 NULL,
 117         };
 118
 119         char *argv[] = {
 120                 v86d_path,
 121                 NULL,
 122         };
 123
 124         return call_usermodehelper(v86d_path, argv, envp, UMH_WAIT_PROC);
 125 }
 126
 127 /*
 128  * Execute a uvesafb task.
 129  *
 130  * Returns 0 if the task is executed successfully.
 131  *
 132  * A message sent to the userspace consists of the uvesafb_task
 133  * struct and (optionally) a buffer. The uvesafb_task struct is
 134  * a simplified version of uvesafb_ktask (its kernel counterpart)
 135  * containing only the register values, flags and the length of
 136  * the buffer.
 137  *
 138  * Each message is assigned a sequence number (increased linearly)
 139  * and a random ack number. The sequence number is used as a key
 140  * for the uvfb_tasks array which holds pointers to uvesafb_ktask
 141  * structs for all requests.
 142  */
 143 static int uvesafb_exec(struct uvesafb_ktask *task)
 144 {
 145         static int seq;
 146         struct cn_msg *m;
 147         int err;
 148         int len = sizeof(task->t) + task->t.buf_len;
 149
 150         /*
 151          * Check whether the message isn't longer than the maximum
 152          * allowed by connector.
 153          */
 154         if (sizeof(*m) + len > CONNECTOR_MAX_MSG_SIZE) {
 155                 pr_warn("message too long (%d), can't execute task\n",
 156                         (int)(sizeof(*m) + len));
 157                 return -E2BIG;
 158         }
 159
 160         m = kzalloc(sizeof(*m) + len, GFP_KERNEL);
 161         if (!m)
 162                 return -ENOMEM;
 163
 164         init_completion(task->done);
 165
 166         memcpy(&m->id, &uvesafb_cn_id, sizeof(m->id));
 167         m->seq = seq;
 168         m->len = len;
 169         m->ack = prandom_u32();
 170
 171         /* uvesafb_task structure */
 172         memcpy(m + 1, &task->t, sizeof(task->t));
 173
 174         /* Buffer */
 175         memcpy((u8 *)(m + 1) + sizeof(task->t), task->buf, task->t.buf_len);
 176
 177         /*
 178          * Save the message ack number so that we can find the kernel
 179          * part of this task when a reply is received from userspace.
 180          */
 181         task->ack = m->ack;
 182
 183         mutex_lock(&uvfb_lock);
 184
 185         /* If all slots are taken -- bail out. */
 186         if (uvfb_tasks[seq]) {
 187                 mutex_unlock(&uvfb_lock);
 188                 err = -EBUSY;
 189                 goto out;
 190         }
 191
 192         /* Save a pointer to the kernel part of the task struct. */
 193         uvfb_tasks[seq] = task;
 194         mutex_unlock(&uvfb_lock);
 195
 196         err = cn_netlink_send(m, 0, 0, GFP_KERNEL);
 197         if (err == -ESRCH) {
 198                 /*
 199                  * Try to start the userspace helper if sending
 200                  * the request failed the first time.
 201                  */
 202                 err = uvesafb_helper_start();
 203                 if (err) {
 204                         pr_err("failed to execute %s\n", v86d_path);
 205                         pr_err("make sure that the v86d helper is installed and executable\n");
 206                 } else {
 207                         v86d_started = 1;
 208                         err = cn_netlink_send(m, 0, 0, gfp_any());
 209                         if (err == -ENOBUFS)
 210                                 err = 0;
 211                 }
 212         } else if (err == -ENOBUFS)
 213                 err = 0;
 214
 215         if (!err && !(task->t.flags & TF_EXIT))
 216                 err = !wait_for_completion_timeout(task->done,
 217                                 msecs_to_jiffies(UVESAFB_TIMEOUT));
 218
 219         mutex_lock(&uvfb_lock);
 220         uvfb_tasks[seq] = NULL;
 221         mutex_unlock(&uvfb_lock);
 222
 223         seq++;
 224         if (seq >= UVESAFB_TASKS_MAX)
 225                 seq = 0;
 226 out:
 227         kfree(m);
 228         return err;
 229 }
 230
 231 /*
 232  * Free a uvesafb_ktask struct.
 233  */
 234 static void uvesafb_free(struct uvesafb_ktask *task)
 235 {
 236         if (task) {
 237                 kfree(task->done);
 238                 kfree(task);
 239         }
 240 }
 241
 242 /*
 243  * Prepare a uvesafb_ktask struct to be used again.
 244  */
 245 static void uvesafb_reset(struct uvesafb_ktask *task)
 246 {
 247         struct completion *cpl = task->done;
 248
 249         memset(task, 0, sizeof(*task));
 250         task->done = cpl;
 251 }
 252
 253 /*
 254  * Allocate and prepare a uvesafb_ktask struct.
 255  */
 256 static struct uvesafb_ktask *uvesafb_prep(void)
 257 {
 258         struct uvesafb_ktask *task;
 259
 260         task = kzalloc(sizeof(*task), GFP_KERNEL);
 261         if (task) {
 262                 task->done = kzalloc(sizeof(*task->done), GFP_KERNEL);
 263                 if (!task->done) {
 264                         kfree(task);
 265                         task = NULL;
 266                 }
 267         }
 268         return task;
 269 }
 270
 271 static void uvesafb_setup_var(struct fb_var_screeninfo *var,
 272                 struct fb_info *info, struct vbe_mode_ib *mode)
 273 {
 274         struct uvesafb_par *par = info->par;
 275
 276         var->vmode = FB_VMODE_NONINTERLACED;
 277         var->sync = FB_SYNC_VERT_HIGH_ACT;
 278
 279         var->xres = mode->x_res;
 280         var->yres = mode->y_res;
 281         var->xres_virtual = mode->x_res;
 282         var->yres_virtual = (par->ypan) ?
 283                         info->fix.smem_len / mode->bytes_per_scan_line :
 284                         mode->y_res;
 285         var->xoffset = 0;
 286         var->yoffset = 0;
 287         var->bits_per_pixel = mode->bits_per_pixel;
 288
 289         if (var->bits_per_pixel == 15)
 290                 var->bits_per_pixel = 16;
 291
 292         if (var->bits_per_pixel > 8) {
 293                 var->red.offset    = mode->red_off;
 294                 var->red.length    = mode->red_len;
 295                 var->green.offset  = mode->green_off;
 296                 var->green.length  = mode->green_len;
 297                 var->blue.offset   = mode->blue_off;
 298                 var->blue.length   = mode->blue_len;
 299                 var->transp.offset = mode->rsvd_off;
 300                 var->transp.length = mode->rsvd_len;
 301         } else {
 302                 var->red.offset    = 0;
 303                 var->green.offset  = 0;
 304                 var->blue.offset   = 0;
 305                 var->transp.offset = 0;
 306
 307                 var->red.length    = 8;
 308                 var->green.length  = 8;
 309                 var->blue.length   = 8;
 310                 var->transp.length = 0;
 311         }
 312 }
 313
 314 static int uvesafb_vbe_find_mode(struct uvesafb_par *par,
 315                 int xres, int yres, int depth, unsigned char flags)
 316 {
 317         int i, match = -1, h = 0, d = 0x7fffffff;
 318
 319         for (i = 0; i < par->vbe_modes_cnt; i++) {
 320                 h = abs(par->vbe_modes[i].x_res - xres) +
 321                     abs(par->vbe_modes[i].y_res - yres) +
 322                     abs(depth - par->vbe_modes[i].depth);
 323
 324                 /*
 325                  * We have an exact match in terms of resolution
 326                  * and depth.
 327                  */
 328                 if (h == 0)
 329                         return i;
 330
 331                 if (h < d || (h == d && par->vbe_modes[i].depth > depth)) {
 332                         d = h;
 333                         match = i;
 334                 }
 335         }
 336         i = 1;
 337
 338         if (flags & UVESAFB_EXACT_DEPTH &&
 339                         par->vbe_modes[match].depth != depth)
 340                 i = 0;
 341
 342         if (flags & UVESAFB_EXACT_RES && d > 24)
 343                 i = 0;
 344
 345         if (i != 0)
 346                 return match;
 347         else
 348                 return -1;
 349 }
 350
 351 static u8 *uvesafb_vbe_state_save(struct uvesafb_par *par)
 352 {
 353         struct uvesafb_ktask *task;
 354         u8 *state;
 355         int err;
 356
 357         if (!par->vbe_state_size)
 358                 return NULL;
 359
 360         state = kmalloc(par->vbe_state_size, GFP_KERNEL);
 361         if (!state)
 362                 return ERR_PTR(-ENOMEM);
 363
 364         task = uvesafb_prep();
 365         if (!task) {
 366                 kfree(state);
 367                 return NULL;
 368         }
 369
 370         task->t.regs.eax = 0x4f04;
 371         task->t.regs.ecx = 0x000f;
 372         task->t.regs.edx = 0x0001;
 373         task->t.flags = TF_BUF_RET | TF_BUF_ESBX;
 374         task->t.buf_len = par->vbe_state_size;
 375         task->buf = state;
 376         err = uvesafb_exec(task);
 377
 378         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 379                 pr_warn("VBE get state call failed (eax=0x%x, err=%d)\n",
 380                         task->t.regs.eax, err);
 381                 kfree(state);
 382                 state = NULL;
 383         }
 384
 385         uvesafb_free(task);
 386         return state;
 387 }
 388
 389 static void uvesafb_vbe_state_restore(struct uvesafb_par *par, u8 *state_buf)
 390 {
 391         struct uvesafb_ktask *task;
 392         int err;
 393
 394         if (!state_buf)
 395                 return;
 396
 397         task = uvesafb_prep();
 398         if (!task)
 399                 return;
 400
 401         task->t.regs.eax = 0x4f04;
 402         task->t.regs.ecx = 0x000f;
 403         task->t.regs.edx = 0x0002;
 404         task->t.buf_len = par->vbe_state_size;
 405         task->t.flags = TF_BUF_ESBX;
 406         task->buf = state_buf;
 407
 408         err = uvesafb_exec(task);
 409         if (err || (task->t.regs.eax & 0xffff) != 0x004f)
 410                 pr_warn("VBE state restore call failed (eax=0x%x, err=%d)\n",
 411                         task->t.regs.eax, err);
 412
 413         uvesafb_free(task);
 414 }
 415
 416 static int uvesafb_vbe_getinfo(struct uvesafb_ktask *task,
 417                                struct uvesafb_par *par)
 418 {
 419         int err;
 420
 421         task->t.regs.eax = 0x4f00;
 422         task->t.flags = TF_VBEIB;
 423         task->t.buf_len = sizeof(struct vbe_ib);
 424         task->buf = &par->vbe_ib;
 425         strncpy(par->vbe_ib.vbe_signature, "VBE2", 4);
 426
 427         err = uvesafb_exec(task);
 428         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 429                 pr_err("Getting VBE info block failed (eax=0x%x, err=%d)\n",
 430                        (u32)task->t.regs.eax, err);
 431                 return -EINVAL;
 432         }
 433
 434         if (par->vbe_ib.vbe_version < 0x0200) {
 435                 pr_err("Sorry, pre-VBE 2.0 cards are not supported\n");
 436                 return -EINVAL;
 437         }
 438
 439         if (!par->vbe_ib.mode_list_ptr) {
 440                 pr_err("Missing mode list!\n");
 441                 return -EINVAL;
 442         }
 443
 444         pr_info("");
 445
 446         /*
 447          * Convert string pointers and the mode list pointer into
 448          * usable addresses. Print informational messages about the
 449          * video adapter and its vendor.
 450          */
 451         if (par->vbe_ib.oem_vendor_name_ptr)
 452                 pr_cont("%s, ",
 453                         ((char *)task->buf) + par->vbe_ib.oem_vendor_name_ptr);
 454
 455         if (par->vbe_ib.oem_product_name_ptr)
 456                 pr_cont("%s, ",
 457                         ((char *)task->buf) + par->vbe_ib.oem_product_name_ptr);
 458
 459         if (par->vbe_ib.oem_product_rev_ptr)
 460                 pr_cont("%s, ",
 461                         ((char *)task->buf) + par->vbe_ib.oem_product_rev_ptr);
 462
 463         if (par->vbe_ib.oem_string_ptr)
 464                 pr_cont("OEM: %s, ",
 465                         ((char *)task->buf) + par->vbe_ib.oem_string_ptr);
 466
 467         pr_cont("VBE v%d.%d\n",
 468                 (par->vbe_ib.vbe_version & 0xff00) >> 8,
 469                 par->vbe_ib.vbe_version & 0xff);
 470
 471         return 0;
 472 }
 473
 474 static int uvesafb_vbe_getmodes(struct uvesafb_ktask *task,
 475                                 struct uvesafb_par *par)
 476 {
 477         int off = 0, err;
 478         u16 *mode;
 479
 480         par->vbe_modes_cnt = 0;
 481
 482         /* Count available modes. */
 483         mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
 484         while (*mode != 0xffff) {
 485                 par->vbe_modes_cnt++;
 486                 mode++;
 487         }
 488
 489         par->vbe_modes = kcalloc(par->vbe_modes_cnt,
 490                                  sizeof(struct vbe_mode_ib),
 491                                  GFP_KERNEL);
 492         if (!par->vbe_modes)
 493                 return -ENOMEM;
 494
 495         /* Get info about all available modes. */
 496         mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
 497         while (*mode != 0xffff) {
 498                 struct vbe_mode_ib *mib;
 499
 500                 uvesafb_reset(task);
 501                 task->t.regs.eax = 0x4f01;
 502                 task->t.regs.ecx = (u32) *mode;
 503                 task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
 504                 task->t.buf_len = sizeof(struct vbe_mode_ib);
 505                 task->buf = par->vbe_modes + off;
 506
 507                 err = uvesafb_exec(task);
 508                 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 509                         pr_warn("Getting mode info block for mode 0x%x failed (eax=0x%x, err=%d)\n",
 510                                 *mode, (u32)task->t.regs.eax, err);
 511                         mode++;
 512                         par->vbe_modes_cnt--;
 513                         continue;
 514                 }
 515
 516                 mib = task->buf;
 517                 mib->mode_id = *mode;
 518
 519                 /*
 520                  * We only want modes that are supported with the current
 521                  * hardware configuration, color, graphics and that have
 522                  * support for the LFB.
 523                  */
 524                 if ((mib->mode_attr & VBE_MODE_MASK) == VBE_MODE_MASK &&
 525                                  mib->bits_per_pixel >= 8)
 526                         off++;
 527                 else
 528                         par->vbe_modes_cnt--;
 529
 530                 mode++;
 531                 mib->depth = mib->red_len + mib->green_len + mib->blue_len;
 532
 533                 /*
 534                  * Handle 8bpp modes and modes with broken color component
 535                  * lengths.
 536                  */
 537                 if (mib->depth == 0 || (mib->depth == 24 &&
 538                                         mib->bits_per_pixel == 32))
 539                         mib->depth = mib->bits_per_pixel;
 540         }
 541
 542         if (par->vbe_modes_cnt > 0)
 543                 return 0;
 544         else
 545                 return -EINVAL;
 546 }
 547
 548 /*
 549  * The Protected Mode Interface is 32-bit x86 code, so we only run it on
 550  * x86 and not x86_64.
 551  */
 552 #ifdef CONFIG_X86_32
 553 static int uvesafb_vbe_getpmi(struct uvesafb_ktask *task,
 554                               struct uvesafb_par *par)
 555 {
 556         int i, err;
 557
 558         uvesafb_reset(task);
 559         task->t.regs.eax = 0x4f0a;
 560         task->t.regs.ebx = 0x0;
 561         err = uvesafb_exec(task);
 562
 563         if ((task->t.regs.eax & 0xffff) != 0x4f || task->t.regs.es < 0xc000) {
 564                 par->pmi_setpal = par->ypan = 0;
 565         } else {
 566                 par->pmi_base = (u16 *)phys_to_virt(((u32)task->t.regs.es << 4)
 567                                                 + task->t.regs.edi);
 568                 par->pmi_start = (u8 *)par->pmi_base + par->pmi_base[1];
 569                 par->pmi_pal = (u8 *)par->pmi_base + par->pmi_base[2];
 570                 pr_info("protected mode interface info at %04x:%04x\n",
 571                         (u16)task->t.regs.es, (u16)task->t.regs.edi);
 572                 pr_info("pmi: set display start = %p, set palette = %p\n",
 573                         par->pmi_start, par->pmi_pal);
 574
 575                 if (par->pmi_base[3]) {
 576                         pr_info("pmi: ports =");
 577                         for (i = par->pmi_base[3]/2;
 578                                         par->pmi_base[i] != 0xffff; i++)
 579                                 pr_cont(" %x", par->pmi_base[i]);
 580                         pr_cont("\n");
 581
 582                         if (par->pmi_base[i] != 0xffff) {
 583                                 pr_info("can't handle memory requests, pmi disabled\n");
 584                                 par->ypan = par->pmi_setpal = 0;
 585                         }
 586                 }
 587         }
 588         return 0;
 589 }
 590 #endif /* CONFIG_X86_32 */
 591
 592 /*
 593  * Check whether a video mode is supported by the Video BIOS and is
 594  * compatible with the monitor limits.
 595  */
 596 static int uvesafb_is_valid_mode(struct fb_videomode *mode,
 597                                  struct fb_info *info)
 598 {
 599         if (info->monspecs.gtf) {
 600                 fb_videomode_to_var(&info->var, mode);
 601                 if (fb_validate_mode(&info->var, info))
 602                         return 0;
 603         }
 604
 605         if (uvesafb_vbe_find_mode(info->par, mode->xres, mode->yres, 8,
 606                                 UVESAFB_EXACT_RES) == -1)
 607                 return 0;
 608
 609         return 1;
 610 }
 611
 612 static int uvesafb_vbe_getedid(struct uvesafb_ktask *task, struct fb_info *info)
 613 {
 614         struct uvesafb_par *par = info->par;
 615         int err = 0;
 616
 617         if (noedid || par->vbe_ib.vbe_version < 0x0300)
 618                 return -EINVAL;
 619
 620         task->t.regs.eax = 0x4f15;
 621         task->t.regs.ebx = 0;
 622         task->t.regs.ecx = 0;
 623         task->t.buf_len = 0;
 624         task->t.flags = 0;
 625
 626         err = uvesafb_exec(task);
 627
 628         if ((task->t.regs.eax & 0xffff) != 0x004f || err)
 629                 return -EINVAL;
 630
 631         if ((task->t.regs.ebx & 0x3) == 3) {
 632                 pr_info("VBIOS/hardware supports both DDC1 and DDC2 transfers\n");
 633         } else if ((task->t.regs.ebx & 0x3) == 2) {
 634                 pr_info("VBIOS/hardware supports DDC2 transfers\n");
 635         } else if ((task->t.regs.ebx & 0x3) == 1) {
 636                 pr_info("VBIOS/hardware supports DDC1 transfers\n");
 637         } else {
 638                 pr_info("VBIOS/hardware doesn't support DDC transfers\n");
 639                 return -EINVAL;
 640         }
 641
 642         task->t.regs.eax = 0x4f15;
 643         task->t.regs.ebx = 1;
 644         task->t.regs.ecx = task->t.regs.edx = 0;
 645         task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
 646         task->t.buf_len = EDID_LENGTH;
 647         task->buf = kzalloc(EDID_LENGTH, GFP_KERNEL);
 648         if (!task->buf)
 649                 return -ENOMEM;
 650
 651         err = uvesafb_exec(task);
 652
 653         if ((task->t.regs.eax & 0xffff) == 0x004f && !err) {
 654                 fb_edid_to_monspecs(task->buf, &info->monspecs);
 655
 656                 if (info->monspecs.vfmax && info->monspecs.hfmax) {
 657                         /*
 658                          * If the maximum pixel clock wasn't specified in
 659                          * the EDID block, set it to 300 MHz.
 660                          */
 661                         if (info->monspecs.dclkmax == 0)
 662                                 info->monspecs.dclkmax = 300 * 1000000;
 663                         info->monspecs.gtf = 1;
 664                 }
 665         } else {
 666                 err = -EINVAL;
 667         }
 668
 669         kfree(task->buf);
 670         return err;
 671 }
 672
 673 static void uvesafb_vbe_getmonspecs(struct uvesafb_ktask *task,
 674                                     struct fb_info *info)
 675 {
 676         struct uvesafb_par *par = info->par;
 677         int i;
 678
 679         memset(&info->monspecs, 0, sizeof(info->monspecs));
 680
 681         /*
 682          * If we don't get all necessary data from the EDID block,
 683          * mark it as incompatible with the GTF and set nocrtc so
 684          * that we always use the default BIOS refresh rate.
 685          */
 686         if (uvesafb_vbe_getedid(task, info)) {
 687                 info->monspecs.gtf = 0;
 688                 par->nocrtc = 1;
 689         }
 690
 691         /* Kernel command line overrides. */
 692         if (maxclk)
 693                 info->monspecs.dclkmax = maxclk * 1000000;
 694         if (maxvf)
 695                 info->monspecs.vfmax = maxvf;
 696         if (maxhf)
 697                 info->monspecs.hfmax = maxhf * 1000;
 698
 699         /*
 700          * In case DDC transfers are not supported, the user can provide
 701          * monitor limits manually. Lower limits are set to "safe" values.
 702          */
 703         if (info->monspecs.gtf == 0 && maxclk && maxvf && maxhf) {
 704                 info->monspecs.dclkmin = 0;
 705                 info->monspecs.vfmin = 60;
 706                 info->monspecs.hfmin = 29000;
 707                 info->monspecs.gtf = 1;
 708                 par->nocrtc = 0;
 709         }
 710
 711         if (info->monspecs.gtf)
 712                 pr_info("monitor limits: vf = %d Hz, hf = %d kHz, clk = %d MHz\n",
 713                         info->monspecs.vfmax,
 714                         (int)(info->monspecs.hfmax / 1000),
 715                         (int)(info->monspecs.dclkmax / 1000000));
 716         else
 717                 pr_info("no monitor limits have been set, default refresh rate will be used\n");
 718
 719         /* Add VBE modes to the modelist. */
 720         for (i = 0; i < par->vbe_modes_cnt; i++) {
 721                 struct fb_var_screeninfo var;
 722                 struct vbe_mode_ib *mode;
 723                 struct fb_videomode vmode;
 724
 725                 mode = &par->vbe_modes[i];
 726                 memset(&var, 0, sizeof(var));
 727
 728                 var.xres = mode->x_res;
 729                 var.yres = mode->y_res;
 730
 731                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, &var, info);
 732                 fb_var_to_videomode(&vmode, &var);
 733                 fb_add_videomode(&vmode, &info->modelist);
 734         }
 735
 736         /* Add valid VESA modes to our modelist. */
 737         for (i = 0; i < VESA_MODEDB_SIZE; i++) {
 738                 if (uvesafb_is_valid_mode((struct fb_videomode *)
 739                                                 &vesa_modes[i], info))
 740                         fb_add_videomode(&vesa_modes[i], &info->modelist);
 741         }
 742
 743         for (i = 0; i < info->monspecs.modedb_len; i++) {
 744                 if (uvesafb_is_valid_mode(&info->monspecs.modedb[i], info))
 745                         fb_add_videomode(&info->monspecs.modedb[i],
 746                                         &info->modelist);
 747         }
 748
 749         return;
 750 }
 751
 752 static void uvesafb_vbe_getstatesize(struct uvesafb_ktask *task,
 753                                      struct uvesafb_par *par)
 754 {
 755         int err;
 756
 757         uvesafb_reset(task);
 758
 759         /*
 760          * Get the VBE state buffer size. We want all available
 761          * hardware state data (CL = 0x0f).
 762          */
 763         task->t.regs.eax = 0x4f04;
 764         task->t.regs.ecx = 0x000f;
 765         task->t.regs.edx = 0x0000;
 766         task->t.flags = 0;
 767
 768         err = uvesafb_exec(task);
 769
 770         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 771                 pr_warn("VBE state buffer size cannot be determined (eax=0x%x, err=%d)\n",
 772                         task->t.regs.eax, err);
 773                 par->vbe_state_size = 0;
 774                 return;
 775         }
 776
 777         par->vbe_state_size = 64 * (task->t.regs.ebx & 0xffff);
 778 }
 779
 780 static int uvesafb_vbe_init(struct fb_info *info)
 781 {
 782         struct uvesafb_ktask *task = NULL;
 783         struct uvesafb_par *par = info->par;
 784         int err;
 785
 786         task = uvesafb_prep();
 787         if (!task)
 788                 return -ENOMEM;
 789
 790         err = uvesafb_vbe_getinfo(task, par);
 791         if (err)
 792                 goto out;
 793
 794         err = uvesafb_vbe_getmodes(task, par);
 795         if (err)
 796                 goto out;
 797
 798         par->nocrtc = nocrtc;
 799 #ifdef CONFIG_X86_32
 800         par->pmi_setpal = pmi_setpal;
 801         par->ypan = ypan;
 802
 803         if (par->pmi_setpal || par->ypan) {
 804                 if (__supported_pte_mask & _PAGE_NX) {
 805                         par->pmi_setpal = par->ypan = 0;
 806                         pr_warn("NX protection is active, better not use the PMI\n");
 807                 } else {
 808                         uvesafb_vbe_getpmi(task, par);
 809                 }
 810         }
 811 #else
 812         /* The protected mode interface is not available on non-x86. */
 813         par->pmi_setpal = par->ypan = 0;
 814 #endif
 815
 816         INIT_LIST_HEAD(&info->modelist);
 817         uvesafb_vbe_getmonspecs(task, info);
 818         uvesafb_vbe_getstatesize(task, par);
 819
 820 out:    uvesafb_free(task);
 821         return err;
 822 }
 823
 824 static int uvesafb_vbe_init_mode(struct fb_info *info)
 825 {
 826         struct list_head *pos;
 827         struct fb_modelist *modelist;
 828         struct fb_videomode *mode;
 829         struct uvesafb_par *par = info->par;
 830         int i, modeid;
 831
 832         /* Has the user requested a specific VESA mode? */
 833         if (vbemode) {
 834                 for (i = 0; i < par->vbe_modes_cnt; i++) {
 835                         if (par->vbe_modes[i].mode_id == vbemode) {
 836                                 modeid = i;
 837                                 uvesafb_setup_var(&info->var, info,
 838                                                 &par->vbe_modes[modeid]);
 839                                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 840                                                 &info->var, info);
 841                                 /*
 842                                  * With pixclock set to 0, the default BIOS
 843                                  * timings will be used in set_par().
 844                                  */
 845                                 info->var.pixclock = 0;
 846                                 goto gotmode;
 847                         }
 848                 }
 849                 pr_info("requested VBE mode 0x%x is unavailable\n", vbemode);
 850                 vbemode = 0;
 851         }
 852
 853         /* Count the modes in the modelist */
 854         i = 0;
 855         list_for_each(pos, &info->modelist)
 856                 i++;
 857
 858         /*
 859          * Convert the modelist into a modedb so that we can use it with
 860          * fb_find_mode().
 861          */
 862         mode = kcalloc(i, sizeof(*mode), GFP_KERNEL);
 863         if (mode) {
 864                 i = 0;
 865                 list_for_each(pos, &info->modelist) {
 866                         modelist = list_entry(pos, struct fb_modelist, list);
 867                         mode[i] = modelist->mode;
 868                         i++;
 869                 }
 870
 871                 if (!mode_option)
 872                         mode_option = UVESAFB_DEFAULT_MODE;
 873
 874                 i = fb_find_mode(&info->var, info, mode_option, mode, i,
 875                         NULL, 8);
 876
 877                 kfree(mode);
 878         }
 879
 880         /* fb_find_mode() failed */
 881         if (i == 0) {
 882                 info->var.xres = 640;
 883                 info->var.yres = 480;
 884                 mode = (struct fb_videomode *)
 885                                 fb_find_best_mode(&info->var, &info->modelist);
 886
 887                 if (mode) {
 888                         fb_videomode_to_var(&info->var, mode);
 889                 } else {
 890                         modeid = par->vbe_modes[0].mode_id;
 891                         uvesafb_setup_var(&info->var, info,
 892                                         &par->vbe_modes[modeid]);
 893                         fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 894                                         &info->var, info);
 895
 896                         goto gotmode;
 897                 }
 898         }
 899
 900         /* Look for a matching VBE mode. */
 901         modeid = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres,
 902                         info->var.bits_per_pixel, UVESAFB_EXACT_RES);
 903
 904         if (modeid == -1)
 905                 return -EINVAL;
 906
 907         uvesafb_setup_var(&info->var, info, &par->vbe_modes[modeid]);
 908
 909 gotmode:
 910         /*
 911          * If we are not VBE3.0+ compliant, we're done -- the BIOS will
 912          * ignore our timings anyway.
 913          */
 914         if (par->vbe_ib.vbe_version < 0x0300 || par->nocrtc)
 915                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 916                                         &info->var, info);
 917
 918         return modeid;
 919 }
 920
 921 static int uvesafb_setpalette(struct uvesafb_pal_entry *entries, int count,
 922                 int start, struct fb_info *info)
 923 {
 924         struct uvesafb_ktask *task;
 925 #ifdef CONFIG_X86
 926         struct uvesafb_par *par = info->par;
 927         int i = par->mode_idx;
 928 #endif
 929         int err = 0;
 930
 931         /*
 932          * We support palette modifications for 8 bpp modes only, so
 933          * there can never be more than 256 entries.
 934          */
 935         if (start + count > 256)
 936                 return -EINVAL;
 937
 938 #ifdef CONFIG_X86
 939         /* Use VGA registers if mode is VGA-compatible. */
 940         if (i >= 0 && i < par->vbe_modes_cnt &&
 941             par->vbe_modes[i].mode_attr & VBE_MODE_VGACOMPAT) {
 942                 for (i = 0; i < count; i++) {
 943                         outb_p(start + i,        dac_reg);
 944                         outb_p(entries[i].red,   dac_val);
 945                         outb_p(entries[i].green, dac_val);
 946                         outb_p(entries[i].blue,  dac_val);
 947                 }
 948         }
 949 #ifdef CONFIG_X86_32
 950         else if (par->pmi_setpal) {
 951                 __asm__ __volatile__(
 952                 "call *(%%esi)"
 953                 : /* no return value */
 954                 : "a" (0x4f09),         /* EAX */
 955                   "b" (0),              /* EBX */
 956                   "c" (count),          /* ECX */
 957                   "d" (start),          /* EDX */
 958                   "D" (entries),        /* EDI */
 959                   "S" (&par->pmi_pal)); /* ESI */
 960         }
 961 #endif /* CONFIG_X86_32 */
 962         else
 963 #endif /* CONFIG_X86 */
 964         {
 965                 task = uvesafb_prep();
 966                 if (!task)
 967                         return -ENOMEM;
 968
 969                 task->t.regs.eax = 0x4f09;
 970                 task->t.regs.ebx = 0x0;
 971                 task->t.regs.ecx = count;
 972                 task->t.regs.edx = start;
 973                 task->t.flags = TF_BUF_ESDI;
 974                 task->t.buf_len = sizeof(struct uvesafb_pal_entry) * count;
 975                 task->buf = entries;
 976
 977                 err = uvesafb_exec(task);
 978                 if ((task->t.regs.eax & 0xffff) != 0x004f)
 979                         err = 1;
 980
 981                 uvesafb_free(task);
 982         }
 983         return err;
 984 }
 985
 986 static int uvesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
 987                 unsigned blue, unsigned transp,
 988                 struct fb_info *info)
 989 {
 990         struct uvesafb_pal_entry entry;
 991         int shift = 16 - dac_width;
 992         int err = 0;
 993
 994         if (regno >= info->cmap.len)
 995                 return -EINVAL;
 996
 997         if (info->var.bits_per_pixel == 8) {
 998                 entry.red   = red   >> shift;
 999                 entry.green = green >> shift;
1000                 entry.blue  = blue  >> shift;
1001                 entry.pad   = 0;
1002
1003                 err = uvesafb_setpalette(&entry, 1, regno, info);
1004         } else if (regno < 16) {
1005                 switch (info->var.bits_per_pixel) {
1006                 case 16:
1007                         if (info->var.red.offset == 10) {
1008                                 /* 1:5:5:5 */
1009                                 ((u32 *) (info->pseudo_palette))[regno] =
1010                                                 ((red   & 0xf800) >>  1) |
1011                                                 ((green & 0xf800) >>  6) |
1012                                                 ((blue  & 0xf800) >> 11);
1013                         } else {
1014                                 /* 0:5:6:5 */
1015                                 ((u32 *) (info->pseudo_palette))[regno] =
1016                                                 ((red   & 0xf800)      ) |
1017                                                 ((green & 0xfc00) >>  5) |
1018                                                 ((blue  & 0xf800) >> 11);
1019                         }
1020                         break;
1021
1022                 case 24:
1023                 case 32:
1024                         red   >>= 8;
1025                         green >>= 8;
1026                         blue  >>= 8;
1027                         ((u32 *)(info->pseudo_palette))[regno] =
1028                                 (red   << info->var.red.offset)   |
1029                                 (green << info->var.green.offset) |
1030                                 (blue  << info->var.blue.offset);
1031                         break;
1032                 }
1033         }
1034         return err;
1035 }
1036
1037 static int uvesafb_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1038 {
1039         struct uvesafb_pal_entry *entries;
1040         int shift = 16 - dac_width;
1041         int i, err = 0;
1042
1043         if (info->var.bits_per_pixel == 8) {
1044                 if (cmap->start + cmap->len > info->cmap.start +
1045                     info->cmap.len || cmap->start < info->cmap.start)
1046                         return -EINVAL;
1047
1048                 entries = kmalloc_array(cmap->len, sizeof(*entries),
1049                                         GFP_KERNEL);
1050                 if (!entries)
1051                         return -ENOMEM;
1052
1053                 for (i = 0; i < cmap->len; i++) {
1054                         entries[i].red   = cmap->red[i]   >> shift;
1055                         entries[i].green = cmap->green[i] >> shift;
1056                         entries[i].blue  = cmap->blue[i]  >> shift;
1057                         entries[i].pad   = 0;
1058                 }
1059                 err = uvesafb_setpalette(entries, cmap->len, cmap->start, info);
1060                 kfree(entries);
1061         } else {
1062                 /*
1063                  * For modes with bpp > 8, we only set the pseudo palette in
1064                  * the fb_info struct. We rely on uvesafb_setcolreg to do all
1065                  * sanity checking.
1066                  */
1067                 for (i = 0; i < cmap->len; i++) {
1068                         err |= uvesafb_setcolreg(cmap->start + i, cmap->red[i],
1069                                                 cmap->green[i], cmap->blue[i],
1070                                                 0, info);
1071                 }
1072         }
1073         return err;
1074 }
1075
1076 static int uvesafb_pan_display(struct fb_var_screeninfo *var,
1077                 struct fb_info *info)
1078 {
1079 #ifdef CONFIG_X86_32
1080         int offset;
1081         struct uvesafb_par *par = info->par;
1082
1083         offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
1084
1085         /*
1086          * It turns out it's not the best idea to do panning via vm86,
1087          * so we only allow it if we have a PMI.
1088          */
1089         if (par->pmi_start) {
1090                 __asm__ __volatile__(
1091                         "call *(%%edi)"
1092                         : /* no return value */
1093                         : "a" (0x4f07),         /* EAX */
1094                           "b" (0),              /* EBX */
1095                           "c" (offset),         /* ECX */
1096                           "d" (offset >> 16),   /* EDX */
1097                           "D" (&par->pmi_start));    /* EDI */
1098         }
1099 #endif
1100         return 0;
1101 }
1102
1103 static int uvesafb_blank(int blank, struct fb_info *info)
1104 {
1105         struct uvesafb_ktask *task;
1106         int err = 1;
1107 #ifdef CONFIG_X86
1108         struct uvesafb_par *par = info->par;
1109
1110         if (par->vbe_ib.capabilities & VBE_CAP_VGACOMPAT) {
1111                 int loop = 10000;
1112                 u8 seq = 0, crtc17 = 0;
1113
1114                 if (blank == FB_BLANK_POWERDOWN) {
1115                         seq = 0x20;
1116                         crtc17 = 0x00;
1117                         err = 0;
1118                 } else {
1119                         seq = 0x00;
1120                         crtc17 = 0x80;
1121                         err = (blank == FB_BLANK_UNBLANK) ? 0 : -EINVAL;
1122                 }
1123
1124                 vga_wseq(NULL, 0x00, 0x01);
1125                 seq |= vga_rseq(NULL, 0x01) & ~0x20;
1126                 vga_wseq(NULL, 0x00, seq);
1127
1128                 crtc17 |= vga_rcrt(NULL, 0x17) & ~0x80;
1129                 while (loop--);
1130                 vga_wcrt(NULL, 0x17, crtc17);
1131                 vga_wseq(NULL, 0x00, 0x03);
1132         } else
1133 #endif /* CONFIG_X86 */
1134         {
1135                 task = uvesafb_prep();
1136                 if (!task)
1137                         return -ENOMEM;
1138
1139                 task->t.regs.eax = 0x4f10;
1140                 switch (blank) {
1141                 case FB_BLANK_UNBLANK:
1142                         task->t.regs.ebx = 0x0001;
1143                         break;
1144                 case FB_BLANK_NORMAL:
1145                         task->t.regs.ebx = 0x0101;      /* standby */
1146                         break;
1147                 case FB_BLANK_POWERDOWN:
1148                         task->t.regs.ebx = 0x0401;      /* powerdown */
1149                         break;
1150                 default:
1151                         goto out;
1152                 }
1153
1154                 err = uvesafb_exec(task);
1155                 if (err || (task->t.regs.eax & 0xffff) != 0x004f)
1156                         err = 1;
1157 out:            uvesafb_free(task);
1158         }
1159         return err;
1160 }
1161
1162 static int uvesafb_open(struct fb_info *info, int user)
1163 {
1164         struct uvesafb_par *par = info->par;
1165         int cnt = atomic_read(&par->ref_count);
1166         u8 *buf = NULL;
1167
1168         if (!cnt && par->vbe_state_size) {
1169                 buf =  uvesafb_vbe_state_save(par);
1170                 if (IS_ERR(buf)) {
1171                         pr_warn("save hardware state failed, error code is %ld!\n",
1172                                 PTR_ERR(buf));
1173                 } else {
1174                         par->vbe_state_orig = buf;
1175                 }
1176         }
1177
1178         atomic_inc(&par->ref_count);
1179         return 0;
1180 }
1181
1182 static int uvesafb_release(struct fb_info *info, int user)
1183 {
1184         struct uvesafb_ktask *task = NULL;
1185         struct uvesafb_par *par = info->par;
1186         int cnt = atomic_read(&par->ref_count);
1187
1188         if (!cnt)
1189                 return -EINVAL;
1190
1191         if (cnt != 1)
1192                 goto out;
1193
1194         task = uvesafb_prep();
1195         if (!task)
1196                 goto out;
1197
1198         /* First, try to set the standard 80x25 text mode. */
1199         task->t.regs.eax = 0x0003;
1200         uvesafb_exec(task);
1201
1202         /*
1203          * Now try to restore whatever hardware state we might have
1204          * saved when the fb device was first opened.
1205          */
1206         uvesafb_vbe_state_restore(par, par->vbe_state_orig);
1207 out:
1208         atomic_dec(&par->ref_count);
1209         uvesafb_free(task);
1210         return 0;
1211 }
1212
1213 static int uvesafb_set_par(struct fb_info *info)
1214 {
1215         struct uvesafb_par *par = info->par;
1216         struct uvesafb_ktask *task = NULL;
1217         struct vbe_crtc_ib *crtc = NULL;
1218         struct vbe_mode_ib *mode = NULL;
1219         int i, err = 0, depth = info->var.bits_per_pixel;
1220
1221         if (depth > 8 && depth != 32)
1222                 depth = info->var.red.length + info->var.green.length +
1223                         info->var.blue.length;
1224
1225         i = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres, depth,
1226                                  UVESAFB_EXACT_RES | UVESAFB_EXACT_DEPTH);
1227         if (i >= 0)
1228                 mode = &par->vbe_modes[i];
1229         else
1230                 return -EINVAL;
1231
1232         task = uvesafb_prep();
1233         if (!task)
1234                 return -ENOMEM;
1235 setmode:
1236         task->t.regs.eax = 0x4f02;
1237         task->t.regs.ebx = mode->mode_id | 0x4000;      /* use LFB */
1238
1239         if (par->vbe_ib.vbe_version >= 0x0300 && !par->nocrtc &&
1240             info->var.pixclock != 0) {
1241                 task->t.regs.ebx |= 0x0800;             /* use CRTC data */
1242                 task->t.flags = TF_BUF_ESDI;
1243                 crtc = kzalloc(sizeof(struct vbe_crtc_ib), GFP_KERNEL);
1244                 if (!crtc) {
1245                         err = -ENOMEM;
1246                         goto out;
1247                 }
1248                 crtc->horiz_start = info->var.xres + info->var.right_margin;
1249                 crtc->horiz_end   = crtc->horiz_start + info->var.hsync_len;
1250                 crtc->horiz_total = crtc->horiz_end + info->var.left_margin;
1251
1252                 crtc->vert_start  = info->var.yres + info->var.lower_margin;
1253                 crtc->vert_end    = crtc->vert_start + info->var.vsync_len;
1254                 crtc->vert_total  = crtc->vert_end + info->var.upper_margin;
1255
1256                 crtc->pixel_clock = PICOS2KHZ(info->var.pixclock) * 1000;
1257                 crtc->refresh_rate = (u16)(100 * (crtc->pixel_clock /
1258                                 (crtc->vert_total * crtc->horiz_total)));
1259
1260                 if (info->var.vmode & FB_VMODE_DOUBLE)
1261                         crtc->flags |= 0x1;
1262                 if (info->var.vmode & FB_VMODE_INTERLACED)
1263                         crtc->flags |= 0x2;
1264                 if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
1265                         crtc->flags |= 0x4;
1266                 if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
1267                         crtc->flags |= 0x8;
1268                 memcpy(&par->crtc, crtc, sizeof(*crtc));
1269         } else {
1270                 memset(&par->crtc, 0, sizeof(*crtc));
1271         }
1272
1273         task->t.buf_len = sizeof(struct vbe_crtc_ib);
1274         task->buf = &par->crtc;
1275
1276         err = uvesafb_exec(task);
1277         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
1278                 /*
1279                  * The mode switch might have failed because we tried to
1280                  * use our own timings.  Try again with the default timings.
1281                  */
1282                 if (crtc != NULL) {
1283                         pr_warn("mode switch failed (eax=0x%x, err=%d) - trying again with default timings\n",
1284                                 task->t.regs.eax, err);
1285                         uvesafb_reset(task);
1286                         kfree(crtc);
1287                         crtc = NULL;
1288                         info->var.pixclock = 0;
1289                         goto setmode;
1290                 } else {
1291                         pr_err("mode switch failed (eax=0x%x, err=%d)\n",
1292                                task->t.regs.eax, err);
1293                         err = -EINVAL;
1294                         goto out;
1295                 }
1296         }
1297         par->mode_idx = i;
1298
1299         /* For 8bpp modes, always try to set the DAC to 8 bits. */
1300         if (par->vbe_ib.capabilities & VBE_CAP_CAN_SWITCH_DAC &&
1301             mode->bits_per_pixel <= 8) {
1302                 uvesafb_reset(task);
1303                 task->t.regs.eax = 0x4f08;
1304                 task->t.regs.ebx = 0x0800;
1305
1306                 err = uvesafb_exec(task);
1307                 if (err || (task->t.regs.eax & 0xffff) != 0x004f ||
1308                     ((task->t.regs.ebx & 0xff00) >> 8) != 8) {
1309                         dac_width = 6;
1310                 } else {
1311                         dac_width = 8;
1312                 }
1313         }
1314
1315         info->fix.visual = (info->var.bits_per_pixel == 8) ?
1316                                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
1317         info->fix.line_length = mode->bytes_per_scan_line;
1318
1319 out:
1320         kfree(crtc);
1321         uvesafb_free(task);
1322
1323         return err;
1324 }
1325
1326 static void uvesafb_check_limits(struct fb_var_screeninfo *var,
1327                 struct fb_info *info)
1328 {
1329         const struct fb_videomode *mode;
1330         struct uvesafb_par *par = info->par;
1331
1332         /*
1333          * If pixclock is set to 0, then we're using default BIOS timings
1334          * and thus don't have to perform any checks here.
1335          */
1336         if (!var->pixclock)
1337                 return;
1338
1339         if (par->vbe_ib.vbe_version < 0x0300) {
1340                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, var, info);
1341                 return;
1342         }
1343
1344         if (!fb_validate_mode(var, info))
1345                 return;
1346
1347         mode = fb_find_best_mode(var, &info->modelist);
1348         if (mode) {
1349                 if (mode->xres == var->xres && mode->yres == var->yres &&
1350                     !(mode->vmode & (FB_VMODE_INTERLACED | FB_VMODE_DOUBLE))) {
1351                         fb_videomode_to_var(var, mode);
1352                         return;
1353                 }
1354         }
1355
1356         if (info->monspecs.gtf && !fb_get_mode(FB_MAXTIMINGS, 0, var, info))
1357                 return;
1358         /* Use default refresh rate */
1359         var->pixclock = 0;
1360 }
1361
1362 static int uvesafb_check_var(struct fb_var_screeninfo *var,
1363                 struct fb_info *info)
1364 {
1365         struct uvesafb_par *par = info->par;
1366         struct vbe_mode_ib *mode = NULL;
1367         int match = -1;
1368         int depth = var->red.length + var->green.length + var->blue.length;
1369
1370         /*
1371          * Various apps will use bits_per_pixel to set the color depth,
1372          * which is theoretically incorrect, but which we'll try to handle
1373          * here.
1374          */
1375         if (depth == 0 || abs(depth - var->bits_per_pixel) >= 8)
1376                 depth = var->bits_per_pixel;
1377
1378         match = uvesafb_vbe_find_mode(par, var->xres, var->yres, depth,
1379                                                 UVESAFB_EXACT_RES);
1380         if (match == -1)
1381                 return -EINVAL;
1382
1383         mode = &par->vbe_modes[match];
1384         uvesafb_setup_var(var, info, mode);
1385
1386         /*
1387          * Check whether we have remapped enough memory for this mode.
1388          * We might be called at an early stage, when we haven't remapped
1389          * any memory yet, in which case we simply skip the check.
1390          */
1391         if (var->yres * mode->bytes_per_scan_line > info->fix.smem_len
1392                                                 && info->fix.smem_len)
1393                 return -EINVAL;
1394
1395         if ((var->vmode & FB_VMODE_DOUBLE) &&
1396                                 !(par->vbe_modes[match].mode_attr & 0x100))
1397                 var->vmode &= ~FB_VMODE_DOUBLE;
1398
1399         if ((var->vmode & FB_VMODE_INTERLACED) &&
1400                                 !(par->vbe_modes[match].mode_attr & 0x200))
1401                 var->vmode &= ~FB_VMODE_INTERLACED;
1402
1403         uvesafb_check_limits(var, info);
1404
1405         var->xres_virtual = var->xres;
1406         var->yres_virtual = (par->ypan) ?
1407                                 info->fix.smem_len / mode->bytes_per_scan_line :
1408                                 var->yres;
1409         return 0;
1410 }
1411
1412 static struct fb_ops uvesafb_ops = {
1413         .owner          = THIS_MODULE,
1414         .fb_open        = uvesafb_open,
1415         .fb_release     = uvesafb_release,
1416         .fb_setcolreg   = uvesafb_setcolreg,
1417         .fb_setcmap     = uvesafb_setcmap,
1418         .fb_pan_display = uvesafb_pan_display,
1419         .fb_blank       = uvesafb_blank,
1420         .fb_fillrect    = cfb_fillrect,
1421         .fb_copyarea    = cfb_copyarea,
1422         .fb_imageblit   = cfb_imageblit,
1423         .fb_check_var   = uvesafb_check_var,
1424         .fb_set_par     = uvesafb_set_par,
1425 };
1426
1427 static void uvesafb_init_info(struct fb_info *info, struct vbe_mode_ib *mode)
1428 {
1429         unsigned int size_vmode;
1430         unsigned int size_remap;
1431         unsigned int size_total;
1432         struct uvesafb_par *par = info->par;
1433         int i, h;
1434
1435         info->pseudo_palette = ((u8 *)info->par + sizeof(struct uvesafb_par));
1436         info->fix = uvesafb_fix;
1437         info->fix.ypanstep = par->ypan ? 1 : 0;
1438         info->fix.ywrapstep = (par->ypan > 1) ? 1 : 0;
1439
1440         /* Disable blanking if the user requested so. */
1441         if (!blank)
1442                 info->fbops->fb_blank = NULL;
1443
1444         /*
1445          * Find out how much IO memory is required for the mode with
1446          * the highest resolution.
1447          */
1448         size_remap = 0;
1449         for (i = 0; i < par->vbe_modes_cnt; i++) {
1450                 h = par->vbe_modes[i].bytes_per_scan_line *
1451                                         par->vbe_modes[i].y_res;
1452                 if (h > size_remap)
1453                         size_remap = h;
1454         }
1455         size_remap *= 2;
1456
1457         /*
1458          *   size_vmode -- that is the amount of memory needed for the
1459          *                 used video mode, i.e. the minimum amount of
1460          *                 memory we need.
1461          */
1462         size_vmode = info->var.yres * mode->bytes_per_scan_line;
1463
1464         /*
1465          *   size_total -- all video memory we have. Used for mtrr
1466          *                 entries, resource allocation and bounds
1467          *                 checking.
1468          */
1469         size_total = par->vbe_ib.total_memory * 65536;
1470         if (vram_total)
1471                 size_total = vram_total * 1024 * 1024;
1472         if (size_total < size_vmode)
1473                 size_total = size_vmode;
1474
1475         /*
1476          *   size_remap -- the amount of video memory we are going to
1477          *                 use for vesafb.  With modern cards it is no
1478          *                 option to simply use size_total as th
1479          *                 wastes plenty of kernel address space.
1480          */
1481         if (vram_remap)
1482                 size_remap = vram_remap * 1024 * 1024;
1483         if (size_remap < size_vmode)
1484                 size_remap = size_vmode;
1485         if (size_remap > size_total)
1486                 size_remap = size_total;
1487
1488         info->fix.smem_len = size_remap;
1489         info->fix.smem_start = mode->phys_base_ptr;
1490
1491         /*
1492          * We have to set yres_virtual here because when setup_var() was
1493          * called, smem_len wasn't defined yet.
1494          */
1495         info->var.yres_virtual = info->fix.smem_len /
1496                                  mode->bytes_per_scan_line;
1497
1498         if (par->ypan && info->var.yres_virtual > info->var.yres) {
1499                 pr_info("scrolling: %s using protected mode interface, yres_virtual=%d\n",
1500                         (par->ypan > 1) ? "ywrap" : "ypan",
1501                         info->var.yres_virtual);
1502         } else {
1503                 pr_info("scrolling: redraw\n");
1504                 info->var.yres_virtual = info->var.yres;
1505                 par->ypan = 0;
1506         }
1507
1508         info->flags = FBINFO_FLAG_DEFAULT |
1509                         (par->ypan ? FBINFO_HWACCEL_YPAN : 0);
1510
1511         if (!par->ypan)
1512                 info->fbops->fb_pan_display = NULL;
1513 }
1514
1515 static void uvesafb_init_mtrr(struct fb_info *info)
1516 {
1517         struct uvesafb_par *par = info->par;
1518
1519         if (mtrr && !(info->fix.smem_start & (PAGE_SIZE - 1))) {
1520                 int temp_size = info->fix.smem_len;
1521
1522                 int rc;
1523
1524                 /* Find the largest power-of-two */
1525                 temp_size = roundup_pow_of_two(temp_size);
1526
1527                 /* Try and find a power of two to add */
1528                 do {
1529                         rc = arch_phys_wc_add(info->fix.smem_start, temp_size);
1530                         temp_size >>= 1;
1531                 } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
1532
1533                 if (rc >= 0)
1534                         par->mtrr_handle = rc;
1535         }
1536 }
1537
1538 static void uvesafb_ioremap(struct fb_info *info)
1539 {
1540         info->screen_base = ioremap_wc(info->fix.smem_start, info->fix.smem_len);
1541 }
1542
1543 static ssize_t uvesafb_show_vbe_ver(struct device *dev,
1544                 struct device_attribute *attr, char *buf)
1545 {
1546         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1547         struct uvesafb_par *par = info->par;
1548
1549         return snprintf(buf, PAGE_SIZE, "%.4x\n", par->vbe_ib.vbe_version);
1550 }
1551
1552 static DEVICE_ATTR(vbe_version, S_IRUGO, uvesafb_show_vbe_ver, NULL);
1553
1554 static ssize_t uvesafb_show_vbe_modes(struct device *dev,
1555                 struct device_attribute *attr, char *buf)
1556 {
1557         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1558         struct uvesafb_par *par = info->par;
1559         int ret = 0, i;
1560
1561         for (i = 0; i < par->vbe_modes_cnt && ret < PAGE_SIZE; i++) {
1562                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
1563                         "%dx%d-%d, 0x%.4x\n",
1564                         par->vbe_modes[i].x_res, par->vbe_modes[i].y_res,
1565                         par->vbe_modes[i].depth, par->vbe_modes[i].mode_id);
1566         }
1567
1568         return ret;
1569 }
1570
1571 static DEVICE_ATTR(vbe_modes, S_IRUGO, uvesafb_show_vbe_modes, NULL);
1572
1573 static ssize_t uvesafb_show_vendor(struct device *dev,
1574                 struct device_attribute *attr, char *buf)
1575 {
1576         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1577         struct uvesafb_par *par = info->par;
1578
1579         if (par->vbe_ib.oem_vendor_name_ptr)
1580                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1581                         (&par->vbe_ib) + par->vbe_ib.oem_vendor_name_ptr);
1582         else
1583                 return 0;
1584 }
1585
1586 static DEVICE_ATTR(oem_vendor, S_IRUGO, uvesafb_show_vendor, NULL);
1587
1588 static ssize_t uvesafb_show_product_name(struct device *dev,
1589                 struct device_attribute *attr, char *buf)
1590 {
1591         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1592         struct uvesafb_par *par = info->par;
1593
1594         if (par->vbe_ib.oem_product_name_ptr)
1595                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1596                         (&par->vbe_ib) + par->vbe_ib.oem_product_name_ptr);
1597         else
1598                 return 0;
1599 }
1600
1601 static DEVICE_ATTR(oem_product_name, S_IRUGO, uvesafb_show_product_name, NULL);
1602
1603 static ssize_t uvesafb_show_product_rev(struct device *dev,
1604                 struct device_attribute *attr, char *buf)
1605 {
1606         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1607         struct uvesafb_par *par = info->par;
1608
1609         if (par->vbe_ib.oem_product_rev_ptr)
1610                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1611                         (&par->vbe_ib) + par->vbe_ib.oem_product_rev_ptr);
1612         else
1613                 return 0;
1614 }
1615
1616 static DEVICE_ATTR(oem_product_rev, S_IRUGO, uvesafb_show_product_rev, NULL);
1617
1618 static ssize_t uvesafb_show_oem_string(struct device *dev,
1619                 struct device_attribute *attr, char *buf)
1620 {
1621         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1622         struct uvesafb_par *par = info->par;
1623
1624         if (par->vbe_ib.oem_string_ptr)
1625                 return snprintf(buf, PAGE_SIZE, "%s\n",
1626                         (char *)(&par->vbe_ib) + par->vbe_ib.oem_string_ptr);
1627         else
1628                 return 0;
1629 }
1630
1631 static DEVICE_ATTR(oem_string, S_IRUGO, uvesafb_show_oem_string, NULL);
1632
1633 static ssize_t uvesafb_show_nocrtc(struct device *dev,
1634                 struct device_attribute *attr, char *buf)
1635 {
1636         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1637         struct uvesafb_par *par = info->par;
1638
1639         return snprintf(buf, PAGE_SIZE, "%d\n", par->nocrtc);
1640 }
1641
1642 static ssize_t uvesafb_store_nocrtc(struct device *dev,
1643                 struct device_attribute *attr, const char *buf, size_t count)
1644 {
1645         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1646         struct uvesafb_par *par = info->par;
1647
1648         if (count > 0) {
1649                 if (buf[0] == '0')
1650                         par->nocrtc = 0;
1651                 else
1652                         par->nocrtc = 1;
1653         }
1654         return count;
1655 }
1656
1657 static DEVICE_ATTR(nocrtc, S_IRUGO | S_IWUSR, uvesafb_show_nocrtc,
1658                         uvesafb_store_nocrtc);
1659
1660 static struct attribute *uvesafb_dev_attrs[] = {
1661         &dev_attr_vbe_version.attr,
1662         &dev_attr_vbe_modes.attr,
1663         &dev_attr_oem_vendor.attr,
1664         &dev_attr_oem_product_name.attr,
1665         &dev_attr_oem_product_rev.attr,
1666         &dev_attr_oem_string.attr,
1667         &dev_attr_nocrtc.attr,
1668         NULL,
1669 };
1670
1671 static const struct attribute_group uvesafb_dev_attgrp = {
1672         .name = NULL,
1673         .attrs = uvesafb_dev_attrs,
1674 };
1675
1676 static int uvesafb_probe(struct platform_device *dev)
1677 {
1678         struct fb_info *info;
1679         struct vbe_mode_ib *mode = NULL;
1680         struct uvesafb_par *par;
1681         int err = 0, i;
1682
1683         info = framebuffer_alloc(sizeof(*par) + sizeof(u32) * 256, &dev->dev);
1684         if (!info)
1685                 return -ENOMEM;
1686
1687         par = info->par;
1688
1689         err = uvesafb_vbe_init(info);
1690         if (err) {
1691                 pr_err("vbe_init() failed with %d\n", err);
1692                 goto out;
1693         }
1694
1695         info->fbops = &uvesafb_ops;
1696
1697         i = uvesafb_vbe_init_mode(info);
1698         if (i < 0) {
1699                 err = -EINVAL;
1700                 goto out;
1701         } else {
1702                 mode = &par->vbe_modes[i];
1703         }
1704
1705         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
1706                 err = -ENXIO;
1707                 goto out;
1708         }
1709
1710         uvesafb_init_info(info, mode);
1711
1712         if (!request_region(0x3c0, 32, "uvesafb")) {
1713                 pr_err("request region 0x3c0-0x3e0 failed\n");
1714                 err = -EIO;
1715                 goto out_mode;
1716         }
1717
1718         if (!request_mem_region(info->fix.smem_start, info->fix.smem_len,
1719                                 "uvesafb")) {
1720                 pr_err("cannot reserve video memory at 0x%lx\n",
1721                        info->fix.smem_start);
1722                 err = -EIO;
1723                 goto out_reg;
1724         }
1725
1726         uvesafb_init_mtrr(info);
1727         uvesafb_ioremap(info);
1728
1729         if (!info->screen_base) {
1730                 pr_err("abort, cannot ioremap 0x%x bytes of video memory at 0x%lx\n",
1731                        info->fix.smem_len, info->fix.smem_start);
1732                 err = -EIO;
1733                 goto out_mem;
1734         }
1735
1736         platform_set_drvdata(dev, info);
1737
1738         if (register_framebuffer(info) < 0) {
1739                 pr_err("failed to register framebuffer device\n");
1740                 err = -EINVAL;
1741                 goto out_unmap;
1742         }
1743
1744         pr_info("framebuffer at 0x%lx, mapped to 0x%p, using %dk, total %dk\n",
1745                 info->fix.smem_start, info->screen_base,
1746                 info->fix.smem_len / 1024, par->vbe_ib.total_memory * 64);
1747         fb_info(info, "%s frame buffer device\n", info->fix.id);
1748
1749         err = sysfs_create_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1750         if (err != 0)
1751                 fb_warn(info, "failed to register attributes\n");
1752
1753         return 0;
1754
1755 out_unmap:
1756         iounmap(info->screen_base);
1757 out_mem:
1758         arch_phys_wc_del(par->mtrr_handle);
1759         release_mem_region(info->fix.smem_start, info->fix.smem_len);
1760 out_reg:
1761         release_region(0x3c0, 32);
1762 out_mode:
1763         if (!list_empty(&info->modelist))
1764                 fb_destroy_modelist(&info->modelist);
1765         fb_destroy_modedb(info->monspecs.modedb);
1766         fb_dealloc_cmap(&info->cmap);
1767 out:
1768         kfree(par->vbe_modes);
1769
1770         framebuffer_release(info);
1771         return err;
1772 }
1773
1774 static int uvesafb_remove(struct platform_device *dev)
1775 {
1776         struct fb_info *info = platform_get_drvdata(dev);
1777
1778         if (info) {
1779                 struct uvesafb_par *par = info->par;
1780
1781                 sysfs_remove_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1782                 unregister_framebuffer(info);
1783                 release_region(0x3c0, 32);
1784                 iounmap(info->screen_base);
1785                 arch_phys_wc_del(par->mtrr_handle);
1786                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1787                 fb_destroy_modedb(info->monspecs.modedb);
1788                 fb_dealloc_cmap(&info->cmap);
1789
1790                 kfree(par->vbe_modes);
1791                 kfree(par->vbe_state_orig);
1792                 kfree(par->vbe_state_saved);
1793
1794                 framebuffer_release(info);
1795         }
1796         return 0;
1797 }
1798
1799 static struct platform_driver uvesafb_driver = {
1800         .probe  = uvesafb_probe,
1801         .remove = uvesafb_remove,
1802         .driver = {
1803                 .name = "uvesafb",
1804         },
1805 };
1806
1807 static struct platform_device *uvesafb_device;
1808
1809 #ifndef MODULE
1810 static int uvesafb_setup(char *options)
1811 {
1812         char *this_opt;
1813
1814         if (!options || !*options)
1815                 return 0;
1816
1817         while ((this_opt = strsep(&options, ",")) != NULL) {
1818                 if (!*this_opt) continue;
1819
1820                 if (!strcmp(this_opt, "redraw"))
1821                         ypan = 0;
1822                 else if (!strcmp(this_opt, "ypan"))
1823                         ypan = 1;
1824                 else if (!strcmp(this_opt, "ywrap"))
1825                         ypan = 2;
1826                 else if (!strcmp(this_opt, "vgapal"))
1827                         pmi_setpal = 0;
1828                 else if (!strcmp(this_opt, "pmipal"))
1829                         pmi_setpal = 1;
1830                 else if (!strncmp(this_opt, "mtrr:", 5))
1831                         mtrr = simple_strtoul(this_opt+5, NULL, 0);
1832                 else if (!strcmp(this_opt, "nomtrr"))
1833                         mtrr = 0;
1834                 else if (!strcmp(this_opt, "nocrtc"))
1835                         nocrtc = 1;
1836                 else if (!strcmp(this_opt, "noedid"))
1837                         noedid = 1;
1838                 else if (!strcmp(this_opt, "noblank"))
1839                         blank = 0;
1840                 else if (!strncmp(this_opt, "vtotal:", 7))
1841                         vram_total = simple_strtoul(this_opt + 7, NULL, 0);
1842                 else if (!strncmp(this_opt, "vremap:", 7))
1843                         vram_remap = simple_strtoul(this_opt + 7, NULL, 0);
1844                 else if (!strncmp(this_opt, "maxhf:", 6))
1845                         maxhf = simple_strtoul(this_opt + 6, NULL, 0);
1846                 else if (!strncmp(this_opt, "maxvf:", 6))
1847                         maxvf = simple_strtoul(this_opt + 6, NULL, 0);
1848                 else if (!strncmp(this_opt, "maxclk:", 7))
1849                         maxclk = simple_strtoul(this_opt + 7, NULL, 0);
1850                 else if (!strncmp(this_opt, "vbemode:", 8))
1851                         vbemode = simple_strtoul(this_opt + 8, NULL, 0);
1852                 else if (this_opt[0] >= '0' && this_opt[0] <= '9') {
1853                         mode_option = this_opt;
1854                 } else {
1855                         pr_warn("unrecognized option %s\n", this_opt);
1856                 }
1857         }
1858
1859         if (mtrr != 3 && mtrr != 0)
1860                 pr_warn("uvesafb: mtrr should be set to 0 or 3; %d is unsupported", mtrr);
1861
1862         return 0;
1863 }
1864 #endif /* !MODULE */
1865
1866 static ssize_t v86d_show(struct device_driver *dev, char *buf)
1867 {
1868         return snprintf(buf, PAGE_SIZE, "%s\n", v86d_path);
1869 }
1870
1871 static ssize_t v86d_store(struct device_driver *dev, const char *buf,
1872                 size_t count)
1873 {
1874         strncpy(v86d_path, buf, PATH_MAX);
1875         return count;
1876 }
1877 static DRIVER_ATTR_RW(v86d);
1878
1879 static int uvesafb_init(void)
1880 {
1881         int err;
1882
1883 #ifndef MODULE
1884         char *option = NULL;
1885
1886         if (fb_get_options("uvesafb", &option))
1887                 return -ENODEV;
1888         uvesafb_setup(option);
1889 #endif
1890         err = cn_add_callback(&uvesafb_cn_id, "uvesafb", uvesafb_cn_callback);
1891         if (err)
1892                 return err;
1893
1894         err = platform_driver_register(&uvesafb_driver);
1895
1896         if (!err) {
1897                 uvesafb_device = platform_device_alloc("uvesafb", 0);
1898                 if (uvesafb_device)
1899                         err = platform_device_add(uvesafb_device);
1900                 else
1901                         err = -ENOMEM;
1902
1903                 if (err) {
1904                         platform_device_put(uvesafb_device);
1905                         platform_driver_unregister(&uvesafb_driver);
1906                         cn_del_callback(&uvesafb_cn_id);
1907                         return err;
1908                 }
1909
1910                 err = driver_create_file(&uvesafb_driver.driver,
1911                                 &driver_attr_v86d);
1912                 if (err) {
1913                         pr_warn("failed to register attributes\n");
1914                         err = 0;
1915                 }
1916         }
1917         return err;
1918 }
1919
1920 module_init(uvesafb_init);
1921
1922 static void uvesafb_exit(void)
1923 {
1924         struct uvesafb_ktask *task;
1925
1926         if (v86d_started) {
1927                 task = uvesafb_prep();
1928                 if (task) {
1929                         task->t.flags = TF_EXIT;
1930                         uvesafb_exec(task);
1931                         uvesafb_free(task);
1932                 }
1933         }
1934
1935         cn_del_callback(&uvesafb_cn_id);
1936         driver_remove_file(&uvesafb_driver.driver, &driver_attr_v86d);
1937         platform_device_unregister(uvesafb_device);
1938         platform_driver_unregister(&uvesafb_driver);
1939 }
1940
1941 module_exit(uvesafb_exit);
1942
1943 static int param_set_scroll(const char *val, const struct kernel_param *kp)
1944 {
1945         ypan = 0;
1946
1947         if (!strcmp(val, "redraw"))
1948                 ypan = 0;
1949         else if (!strcmp(val, "ypan"))
1950                 ypan = 1;
1951         else if (!strcmp(val, "ywrap"))
1952                 ypan = 2;
1953         else
1954                 return -EINVAL;
1955
1956         return 0;
1957 }
1958 static const struct kernel_param_ops param_ops_scroll = {
1959         .set = param_set_scroll,
1960 };
1961 #define param_check_scroll(name, p) __param_check(name, p, void)
1962
1963 module_param_named(scroll, ypan, scroll, 0);
1964 MODULE_PARM_DESC(scroll,
1965         "Scrolling mode, set to 'redraw', 'ypan', or 'ywrap'");
1966 module_param_named(vgapal, pmi_setpal, invbool, 0);
1967 MODULE_PARM_DESC(vgapal, "Set palette using VGA registers");
1968 module_param_named(pmipal, pmi_setpal, bool, 0);
1969 MODULE_PARM_DESC(pmipal, "Set palette using PMI calls");
1970 module_param(mtrr, uint, 0);
1971 MODULE_PARM_DESC(mtrr,
1972         "Memory Type Range Registers setting. Use 0 to disable.");
1973 module_param(blank, bool, 0);
1974 MODULE_PARM_DESC(blank, "Enable hardware blanking");
1975 module_param(nocrtc, bool, 0);
1976 MODULE_PARM_DESC(nocrtc, "Ignore CRTC timings when setting modes");
1977 module_param(noedid, bool, 0);
1978 MODULE_PARM_DESC(noedid,
1979         "Ignore EDID-provided monitor limits when setting modes");
1980 module_param(vram_remap, uint, 0);
1981 MODULE_PARM_DESC(vram_remap, "Set amount of video memory to be used [MiB]");
1982 module_param(vram_total, uint, 0);
1983 MODULE_PARM_DESC(vram_total, "Set total amount of video memoery [MiB]");
1984 module_param(maxclk, ushort, 0);
1985 MODULE_PARM_DESC(maxclk, "Maximum pixelclock [MHz], overrides EDID data");
1986 module_param(maxhf, ushort, 0);
1987 MODULE_PARM_DESC(maxhf,
1988         "Maximum horizontal frequency [kHz], overrides EDID data");
1989 module_param(maxvf, ushort, 0);
1990 MODULE_PARM_DESC(maxvf,
1991         "Maximum vertical frequency [Hz], overrides EDID data");
1992 module_param(mode_option, charp, 0);
1993 MODULE_PARM_DESC(mode_option,
1994         "Specify initial video mode as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");
1995 module_param(vbemode, ushort, 0);
1996 MODULE_PARM_DESC(vbemode,
1997         "VBE mode number to set, overrides the 'mode' option");
1998 module_param_string(v86d, v86d_path, PATH_MAX, 0660);
1999 MODULE_PARM_DESC(v86d, "Path to the v86d userspace helper.");
2000
2001 MODULE_LICENSE("GPL");
2002 MODULE_AUTHOR("Michal Januszewski <spock@gentoo.org>");
2003 MODULE_DESCRIPTION("Framebuffer driver for VBE2.0+ compliant graphics boards");
2004