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 = kzalloc(sizeof(struct vbe_mode_ib) *
 490                                 par->vbe_modes_cnt, GFP_KERNEL);
 491         if (!par->vbe_modes)
 492                 return -ENOMEM;
 493
 494         /* Get info about all available modes. */
 495         mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
 496         while (*mode != 0xffff) {
 497                 struct vbe_mode_ib *mib;
 498
 499                 uvesafb_reset(task);
 500                 task->t.regs.eax = 0x4f01;
 501                 task->t.regs.ecx = (u32) *mode;
 502                 task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
 503                 task->t.buf_len = sizeof(struct vbe_mode_ib);
 504                 task->buf = par->vbe_modes + off;
 505
 506                 err = uvesafb_exec(task);
 507                 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 508                         pr_warn("Getting mode info block for mode 0x%x failed (eax=0x%x, err=%d)\n",
 509                                 *mode, (u32)task->t.regs.eax, err);
 510                         mode++;
 511                         par->vbe_modes_cnt--;
 512                         continue;
 513                 }
 514
 515                 mib = task->buf;
 516                 mib->mode_id = *mode;
 517
 518                 /*
 519                  * We only want modes that are supported with the current
 520                  * hardware configuration, color, graphics and that have
 521                  * support for the LFB.
 522                  */
 523                 if ((mib->mode_attr & VBE_MODE_MASK) == VBE_MODE_MASK &&
 524                                  mib->bits_per_pixel >= 8)
 525                         off++;
 526                 else
 527                         par->vbe_modes_cnt--;
 528
 529                 mode++;
 530                 mib->depth = mib->red_len + mib->green_len + mib->blue_len;
 531
 532                 /*
 533                  * Handle 8bpp modes and modes with broken color component
 534                  * lengths.
 535                  */
 536                 if (mib->depth == 0 || (mib->depth == 24 &&
 537                                         mib->bits_per_pixel == 32))
 538                         mib->depth = mib->bits_per_pixel;
 539         }
 540
 541         if (par->vbe_modes_cnt > 0)
 542                 return 0;
 543         else
 544                 return -EINVAL;
 545 }
 546
 547 /*
 548  * The Protected Mode Interface is 32-bit x86 code, so we only run it on
 549  * x86 and not x86_64.
 550  */
 551 #ifdef CONFIG_X86_32
 552 static int uvesafb_vbe_getpmi(struct uvesafb_ktask *task,
 553                               struct uvesafb_par *par)
 554 {
 555         int i, err;
 556
 557         uvesafb_reset(task);
 558         task->t.regs.eax = 0x4f0a;
 559         task->t.regs.ebx = 0x0;
 560         err = uvesafb_exec(task);
 561
 562         if ((task->t.regs.eax & 0xffff) != 0x4f || task->t.regs.es < 0xc000) {
 563                 par->pmi_setpal = par->ypan = 0;
 564         } else {
 565                 par->pmi_base = (u16 *)phys_to_virt(((u32)task->t.regs.es << 4)
 566                                                 + task->t.regs.edi);
 567                 par->pmi_start = (u8 *)par->pmi_base + par->pmi_base[1];
 568                 par->pmi_pal = (u8 *)par->pmi_base + par->pmi_base[2];
 569                 pr_info("protected mode interface info at %04x:%04x\n",
 570                         (u16)task->t.regs.es, (u16)task->t.regs.edi);
 571                 pr_info("pmi: set display start = %p, set palette = %p\n",
 572                         par->pmi_start, par->pmi_pal);
 573
 574                 if (par->pmi_base[3]) {
 575                         pr_info("pmi: ports =");
 576                         for (i = par->pmi_base[3]/2;
 577                                         par->pmi_base[i] != 0xffff; i++)
 578                                 pr_cont(" %x", par->pmi_base[i]);
 579                         pr_cont("\n");
 580
 581                         if (par->pmi_base[i] != 0xffff) {
 582                                 pr_info("can't handle memory requests, pmi disabled\n");
 583                                 par->ypan = par->pmi_setpal = 0;
 584                         }
 585                 }
 586         }
 587         return 0;
 588 }
 589 #endif /* CONFIG_X86_32 */
 590
 591 /*
 592  * Check whether a video mode is supported by the Video BIOS and is
 593  * compatible with the monitor limits.
 594  */
 595 static int uvesafb_is_valid_mode(struct fb_videomode *mode,
 596                                  struct fb_info *info)
 597 {
 598         if (info->monspecs.gtf) {
 599                 fb_videomode_to_var(&info->var, mode);
 600                 if (fb_validate_mode(&info->var, info))
 601                         return 0;
 602         }
 603
 604         if (uvesafb_vbe_find_mode(info->par, mode->xres, mode->yres, 8,
 605                                 UVESAFB_EXACT_RES) == -1)
 606                 return 0;
 607
 608         return 1;
 609 }
 610
 611 static int uvesafb_vbe_getedid(struct uvesafb_ktask *task, struct fb_info *info)
 612 {
 613         struct uvesafb_par *par = info->par;
 614         int err = 0;
 615
 616         if (noedid || par->vbe_ib.vbe_version < 0x0300)
 617                 return -EINVAL;
 618
 619         task->t.regs.eax = 0x4f15;
 620         task->t.regs.ebx = 0;
 621         task->t.regs.ecx = 0;
 622         task->t.buf_len = 0;
 623         task->t.flags = 0;
 624
 625         err = uvesafb_exec(task);
 626
 627         if ((task->t.regs.eax & 0xffff) != 0x004f || err)
 628                 return -EINVAL;
 629
 630         if ((task->t.regs.ebx & 0x3) == 3) {
 631                 pr_info("VBIOS/hardware supports both DDC1 and DDC2 transfers\n");
 632         } else if ((task->t.regs.ebx & 0x3) == 2) {
 633                 pr_info("VBIOS/hardware supports DDC2 transfers\n");
 634         } else if ((task->t.regs.ebx & 0x3) == 1) {
 635                 pr_info("VBIOS/hardware supports DDC1 transfers\n");
 636         } else {
 637                 pr_info("VBIOS/hardware doesn't support DDC transfers\n");
 638                 return -EINVAL;
 639         }
 640
 641         task->t.regs.eax = 0x4f15;
 642         task->t.regs.ebx = 1;
 643         task->t.regs.ecx = task->t.regs.edx = 0;
 644         task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
 645         task->t.buf_len = EDID_LENGTH;
 646         task->buf = kzalloc(EDID_LENGTH, GFP_KERNEL);
 647         if (!task->buf)
 648                 return -ENOMEM;
 649
 650         err = uvesafb_exec(task);
 651
 652         if ((task->t.regs.eax & 0xffff) == 0x004f && !err) {
 653                 fb_edid_to_monspecs(task->buf, &info->monspecs);
 654
 655                 if (info->monspecs.vfmax && info->monspecs.hfmax) {
 656                         /*
 657                          * If the maximum pixel clock wasn't specified in
 658                          * the EDID block, set it to 300 MHz.
 659                          */
 660                         if (info->monspecs.dclkmax == 0)
 661                                 info->monspecs.dclkmax = 300 * 1000000;
 662                         info->monspecs.gtf = 1;
 663                 }
 664         } else {
 665                 err = -EINVAL;
 666         }
 667
 668         kfree(task->buf);
 669         return err;
 670 }
 671
 672 static void uvesafb_vbe_getmonspecs(struct uvesafb_ktask *task,
 673                                     struct fb_info *info)
 674 {
 675         struct uvesafb_par *par = info->par;
 676         int i;
 677
 678         memset(&info->monspecs, 0, sizeof(info->monspecs));
 679
 680         /*
 681          * If we don't get all necessary data from the EDID block,
 682          * mark it as incompatible with the GTF and set nocrtc so
 683          * that we always use the default BIOS refresh rate.
 684          */
 685         if (uvesafb_vbe_getedid(task, info)) {
 686                 info->monspecs.gtf = 0;
 687                 par->nocrtc = 1;
 688         }
 689
 690         /* Kernel command line overrides. */
 691         if (maxclk)
 692                 info->monspecs.dclkmax = maxclk * 1000000;
 693         if (maxvf)
 694                 info->monspecs.vfmax = maxvf;
 695         if (maxhf)
 696                 info->monspecs.hfmax = maxhf * 1000;
 697
 698         /*
 699          * In case DDC transfers are not supported, the user can provide
 700          * monitor limits manually. Lower limits are set to "safe" values.
 701          */
 702         if (info->monspecs.gtf == 0 && maxclk && maxvf && maxhf) {
 703                 info->monspecs.dclkmin = 0;
 704                 info->monspecs.vfmin = 60;
 705                 info->monspecs.hfmin = 29000;
 706                 info->monspecs.gtf = 1;
 707                 par->nocrtc = 0;
 708         }
 709
 710         if (info->monspecs.gtf)
 711                 pr_info("monitor limits: vf = %d Hz, hf = %d kHz, clk = %d MHz\n",
 712                         info->monspecs.vfmax,
 713                         (int)(info->monspecs.hfmax / 1000),
 714                         (int)(info->monspecs.dclkmax / 1000000));
 715         else
 716                 pr_info("no monitor limits have been set, default refresh rate will be used\n");
 717
 718         /* Add VBE modes to the modelist. */
 719         for (i = 0; i < par->vbe_modes_cnt; i++) {
 720                 struct fb_var_screeninfo var;
 721                 struct vbe_mode_ib *mode;
 722                 struct fb_videomode vmode;
 723
 724                 mode = &par->vbe_modes[i];
 725                 memset(&var, 0, sizeof(var));
 726
 727                 var.xres = mode->x_res;
 728                 var.yres = mode->y_res;
 729
 730                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, &var, info);
 731                 fb_var_to_videomode(&vmode, &var);
 732                 fb_add_videomode(&vmode, &info->modelist);
 733         }
 734
 735         /* Add valid VESA modes to our modelist. */
 736         for (i = 0; i < VESA_MODEDB_SIZE; i++) {
 737                 if (uvesafb_is_valid_mode((struct fb_videomode *)
 738                                                 &vesa_modes[i], info))
 739                         fb_add_videomode(&vesa_modes[i], &info->modelist);
 740         }
 741
 742         for (i = 0; i < info->monspecs.modedb_len; i++) {
 743                 if (uvesafb_is_valid_mode(&info->monspecs.modedb[i], info))
 744                         fb_add_videomode(&info->monspecs.modedb[i],
 745                                         &info->modelist);
 746         }
 747
 748         return;
 749 }
 750
 751 static void uvesafb_vbe_getstatesize(struct uvesafb_ktask *task,
 752                                      struct uvesafb_par *par)
 753 {
 754         int err;
 755
 756         uvesafb_reset(task);
 757
 758         /*
 759          * Get the VBE state buffer size. We want all available
 760          * hardware state data (CL = 0x0f).
 761          */
 762         task->t.regs.eax = 0x4f04;
 763         task->t.regs.ecx = 0x000f;
 764         task->t.regs.edx = 0x0000;
 765         task->t.flags = 0;
 766
 767         err = uvesafb_exec(task);
 768
 769         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 770                 pr_warn("VBE state buffer size cannot be determined (eax=0x%x, err=%d)\n",
 771                         task->t.regs.eax, err);
 772                 par->vbe_state_size = 0;
 773                 return;
 774         }
 775
 776         par->vbe_state_size = 64 * (task->t.regs.ebx & 0xffff);
 777 }
 778
 779 static int uvesafb_vbe_init(struct fb_info *info)
 780 {
 781         struct uvesafb_ktask *task = NULL;
 782         struct uvesafb_par *par = info->par;
 783         int err;
 784
 785         task = uvesafb_prep();
 786         if (!task)
 787                 return -ENOMEM;
 788
 789         err = uvesafb_vbe_getinfo(task, par);
 790         if (err)
 791                 goto out;
 792
 793         err = uvesafb_vbe_getmodes(task, par);
 794         if (err)
 795                 goto out;
 796
 797         par->nocrtc = nocrtc;
 798 #ifdef CONFIG_X86_32
 799         par->pmi_setpal = pmi_setpal;
 800         par->ypan = ypan;
 801
 802         if (par->pmi_setpal || par->ypan) {
 803                 if (__supported_pte_mask & _PAGE_NX) {
 804                         par->pmi_setpal = par->ypan = 0;
 805                         pr_warn("NX protection is active, better not use the PMI\n");
 806                 } else {
 807                         uvesafb_vbe_getpmi(task, par);
 808                 }
 809         }
 810 #else
 811         /* The protected mode interface is not available on non-x86. */
 812         par->pmi_setpal = par->ypan = 0;
 813 #endif
 814
 815         INIT_LIST_HEAD(&info->modelist);
 816         uvesafb_vbe_getmonspecs(task, info);
 817         uvesafb_vbe_getstatesize(task, par);
 818
 819 out:    uvesafb_free(task);
 820         return err;
 821 }
 822
 823 static int uvesafb_vbe_init_mode(struct fb_info *info)
 824 {
 825         struct list_head *pos;
 826         struct fb_modelist *modelist;
 827         struct fb_videomode *mode;
 828         struct uvesafb_par *par = info->par;
 829         int i, modeid;
 830
 831         /* Has the user requested a specific VESA mode? */
 832         if (vbemode) {
 833                 for (i = 0; i < par->vbe_modes_cnt; i++) {
 834                         if (par->vbe_modes[i].mode_id == vbemode) {
 835                                 modeid = i;
 836                                 uvesafb_setup_var(&info->var, info,
 837                                                 &par->vbe_modes[modeid]);
 838                                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 839                                                 &info->var, info);
 840                                 /*
 841                                  * With pixclock set to 0, the default BIOS
 842                                  * timings will be used in set_par().
 843                                  */
 844                                 info->var.pixclock = 0;
 845                                 goto gotmode;
 846                         }
 847                 }
 848                 pr_info("requested VBE mode 0x%x is unavailable\n", vbemode);
 849                 vbemode = 0;
 850         }
 851
 852         /* Count the modes in the modelist */
 853         i = 0;
 854         list_for_each(pos, &info->modelist)
 855                 i++;
 856
 857         /*
 858          * Convert the modelist into a modedb so that we can use it with
 859          * fb_find_mode().
 860          */
 861         mode = kzalloc(i * sizeof(*mode), GFP_KERNEL);
 862         if (mode) {
 863                 i = 0;
 864                 list_for_each(pos, &info->modelist) {
 865                         modelist = list_entry(pos, struct fb_modelist, list);
 866                         mode[i] = modelist->mode;
 867                         i++;
 868                 }
 869
 870                 if (!mode_option)
 871                         mode_option = UVESAFB_DEFAULT_MODE;
 872
 873                 i = fb_find_mode(&info->var, info, mode_option, mode, i,
 874                         NULL, 8);
 875
 876                 kfree(mode);
 877         }
 878
 879         /* fb_find_mode() failed */
 880         if (i == 0) {
 881                 info->var.xres = 640;
 882                 info->var.yres = 480;
 883                 mode = (struct fb_videomode *)
 884                                 fb_find_best_mode(&info->var, &info->modelist);
 885
 886                 if (mode) {
 887                         fb_videomode_to_var(&info->var, mode);
 888                 } else {
 889                         modeid = par->vbe_modes[0].mode_id;
 890                         uvesafb_setup_var(&info->var, info,
 891                                         &par->vbe_modes[modeid]);
 892                         fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 893                                         &info->var, info);
 894
 895                         goto gotmode;
 896                 }
 897         }
 898
 899         /* Look for a matching VBE mode. */
 900         modeid = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres,
 901                         info->var.bits_per_pixel, UVESAFB_EXACT_RES);
 902
 903         if (modeid == -1)
 904                 return -EINVAL;
 905
 906         uvesafb_setup_var(&info->var, info, &par->vbe_modes[modeid]);
 907
 908 gotmode:
 909         /*
 910          * If we are not VBE3.0+ compliant, we're done -- the BIOS will
 911          * ignore our timings anyway.
 912          */
 913         if (par->vbe_ib.vbe_version < 0x0300 || par->nocrtc)
 914                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 915                                         &info->var, info);
 916
 917         return modeid;
 918 }
 919
 920 static int uvesafb_setpalette(struct uvesafb_pal_entry *entries, int count,
 921                 int start, struct fb_info *info)
 922 {
 923         struct uvesafb_ktask *task;
 924 #ifdef CONFIG_X86
 925         struct uvesafb_par *par = info->par;
 926         int i = par->mode_idx;
 927 #endif
 928         int err = 0;
 929
 930         /*
 931          * We support palette modifications for 8 bpp modes only, so
 932          * there can never be more than 256 entries.
 933          */
 934         if (start + count > 256)
 935                 return -EINVAL;
 936
 937 #ifdef CONFIG_X86
 938         /* Use VGA registers if mode is VGA-compatible. */
 939         if (i >= 0 && i < par->vbe_modes_cnt &&
 940             par->vbe_modes[i].mode_attr & VBE_MODE_VGACOMPAT) {
 941                 for (i = 0; i < count; i++) {
 942                         outb_p(start + i,        dac_reg);
 943                         outb_p(entries[i].red,   dac_val);
 944                         outb_p(entries[i].green, dac_val);
 945                         outb_p(entries[i].blue,  dac_val);
 946                 }
 947         }
 948 #ifdef CONFIG_X86_32
 949         else if (par->pmi_setpal) {
 950                 __asm__ __volatile__(
 951                 "call *(%%esi)"
 952                 : /* no return value */
 953                 : "a" (0x4f09),         /* EAX */
 954                   "b" (0),              /* EBX */
 955                   "c" (count),          /* ECX */
 956                   "d" (start),          /* EDX */
 957                   "D" (entries),        /* EDI */
 958                   "S" (&par->pmi_pal)); /* ESI */
 959         }
 960 #endif /* CONFIG_X86_32 */
 961         else
 962 #endif /* CONFIG_X86 */
 963         {
 964                 task = uvesafb_prep();
 965                 if (!task)
 966                         return -ENOMEM;
 967
 968                 task->t.regs.eax = 0x4f09;
 969                 task->t.regs.ebx = 0x0;
 970                 task->t.regs.ecx = count;
 971                 task->t.regs.edx = start;
 972                 task->t.flags = TF_BUF_ESDI;
 973                 task->t.buf_len = sizeof(struct uvesafb_pal_entry) * count;
 974                 task->buf = entries;
 975
 976                 err = uvesafb_exec(task);
 977                 if ((task->t.regs.eax & 0xffff) != 0x004f)
 978                         err = 1;
 979
 980                 uvesafb_free(task);
 981         }
 982         return err;
 983 }
 984
 985 static int uvesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
 986                 unsigned blue, unsigned transp,
 987                 struct fb_info *info)
 988 {
 989         struct uvesafb_pal_entry entry;
 990         int shift = 16 - dac_width;
 991         int err = 0;
 992
 993         if (regno >= info->cmap.len)
 994                 return -EINVAL;
 995
 996         if (info->var.bits_per_pixel == 8) {
 997                 entry.red   = red   >> shift;
 998                 entry.green = green >> shift;
 999                 entry.blue  = blue  >> shift;
1000                 entry.pad   = 0;
1001
1002                 err = uvesafb_setpalette(&entry, 1, regno, info);
1003         } else if (regno < 16) {
1004                 switch (info->var.bits_per_pixel) {
1005                 case 16:
1006                         if (info->var.red.offset == 10) {
1007                                 /* 1:5:5:5 */
1008                                 ((u32 *) (info->pseudo_palette))[regno] =
1009                                                 ((red   & 0xf800) >>  1) |
1010                                                 ((green & 0xf800) >>  6) |
1011                                                 ((blue  & 0xf800) >> 11);
1012                         } else {
1013                                 /* 0:5:6:5 */
1014                                 ((u32 *) (info->pseudo_palette))[regno] =
1015                                                 ((red   & 0xf800)      ) |
1016                                                 ((green & 0xfc00) >>  5) |
1017                                                 ((blue  & 0xf800) >> 11);
1018                         }
1019                         break;
1020
1021                 case 24:
1022                 case 32:
1023                         red   >>= 8;
1024                         green >>= 8;
1025                         blue  >>= 8;
1026                         ((u32 *)(info->pseudo_palette))[regno] =
1027                                 (red   << info->var.red.offset)   |
1028                                 (green << info->var.green.offset) |
1029                                 (blue  << info->var.blue.offset);
1030                         break;
1031                 }
1032         }
1033         return err;
1034 }
1035
1036 static int uvesafb_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1037 {
1038         struct uvesafb_pal_entry *entries;
1039         int shift = 16 - dac_width;
1040         int i, err = 0;
1041
1042         if (info->var.bits_per_pixel == 8) {
1043                 if (cmap->start + cmap->len > info->cmap.start +
1044                     info->cmap.len || cmap->start < info->cmap.start)
1045                         return -EINVAL;
1046
1047                 entries = kmalloc_array(cmap->len, sizeof(*entries),
1048                                         GFP_KERNEL);
1049                 if (!entries)
1050                         return -ENOMEM;
1051
1052                 for (i = 0; i < cmap->len; i++) {
1053                         entries[i].red   = cmap->red[i]   >> shift;
1054                         entries[i].green = cmap->green[i] >> shift;
1055                         entries[i].blue  = cmap->blue[i]  >> shift;
1056                         entries[i].pad   = 0;
1057                 }
1058                 err = uvesafb_setpalette(entries, cmap->len, cmap->start, info);
1059                 kfree(entries);
1060         } else {
1061                 /*
1062                  * For modes with bpp > 8, we only set the pseudo palette in
1063                  * the fb_info struct. We rely on uvesafb_setcolreg to do all
1064                  * sanity checking.
1065                  */
1066                 for (i = 0; i < cmap->len; i++) {
1067                         err |= uvesafb_setcolreg(cmap->start + i, cmap->red[i],
1068                                                 cmap->green[i], cmap->blue[i],
1069                                                 0, info);
1070                 }
1071         }
1072         return err;
1073 }
1074
1075 static int uvesafb_pan_display(struct fb_var_screeninfo *var,
1076                 struct fb_info *info)
1077 {
1078 #ifdef CONFIG_X86_32
1079         int offset;
1080         struct uvesafb_par *par = info->par;
1081
1082         offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
1083
1084         /*
1085          * It turns out it's not the best idea to do panning via vm86,
1086          * so we only allow it if we have a PMI.
1087          */
1088         if (par->pmi_start) {
1089                 __asm__ __volatile__(
1090                         "call *(%%edi)"
1091                         : /* no return value */
1092                         : "a" (0x4f07),         /* EAX */
1093                           "b" (0),              /* EBX */
1094                           "c" (offset),         /* ECX */
1095                           "d" (offset >> 16),   /* EDX */
1096                           "D" (&par->pmi_start));    /* EDI */
1097         }
1098 #endif
1099         return 0;
1100 }
1101
1102 static int uvesafb_blank(int blank, struct fb_info *info)
1103 {
1104         struct uvesafb_ktask *task;
1105         int err = 1;
1106 #ifdef CONFIG_X86
1107         struct uvesafb_par *par = info->par;
1108
1109         if (par->vbe_ib.capabilities & VBE_CAP_VGACOMPAT) {
1110                 int loop = 10000;
1111                 u8 seq = 0, crtc17 = 0;
1112
1113                 if (blank == FB_BLANK_POWERDOWN) {
1114                         seq = 0x20;
1115                         crtc17 = 0x00;
1116                         err = 0;
1117                 } else {
1118                         seq = 0x00;
1119                         crtc17 = 0x80;
1120                         err = (blank == FB_BLANK_UNBLANK) ? 0 : -EINVAL;
1121                 }
1122
1123                 vga_wseq(NULL, 0x00, 0x01);
1124                 seq |= vga_rseq(NULL, 0x01) & ~0x20;
1125                 vga_wseq(NULL, 0x00, seq);
1126
1127                 crtc17 |= vga_rcrt(NULL, 0x17) & ~0x80;
1128                 while (loop--);
1129                 vga_wcrt(NULL, 0x17, crtc17);
1130                 vga_wseq(NULL, 0x00, 0x03);
1131         } else
1132 #endif /* CONFIG_X86 */
1133         {
1134                 task = uvesafb_prep();
1135                 if (!task)
1136                         return -ENOMEM;
1137
1138                 task->t.regs.eax = 0x4f10;
1139                 switch (blank) {
1140                 case FB_BLANK_UNBLANK:
1141                         task->t.regs.ebx = 0x0001;
1142                         break;
1143                 case FB_BLANK_NORMAL:
1144                         task->t.regs.ebx = 0x0101;      /* standby */
1145                         break;
1146                 case FB_BLANK_POWERDOWN:
1147                         task->t.regs.ebx = 0x0401;      /* powerdown */
1148                         break;
1149                 default:
1150                         goto out;
1151                 }
1152
1153                 err = uvesafb_exec(task);
1154                 if (err || (task->t.regs.eax & 0xffff) != 0x004f)
1155                         err = 1;
1156 out:            uvesafb_free(task);
1157         }
1158         return err;
1159 }
1160
1161 static int uvesafb_open(struct fb_info *info, int user)
1162 {
1163         struct uvesafb_par *par = info->par;
1164         int cnt = atomic_read(&par->ref_count);
1165         u8 *buf = NULL;
1166
1167         if (!cnt && par->vbe_state_size) {
1168                 buf =  uvesafb_vbe_state_save(par);
1169                 if (IS_ERR(buf)) {
1170                         pr_warn("save hardware state failed, error code is %ld!\n",
1171                                 PTR_ERR(buf));
1172                 } else {
1173                         par->vbe_state_orig = buf;
1174                 }
1175         }
1176
1177         atomic_inc(&par->ref_count);
1178         return 0;
1179 }
1180
1181 static int uvesafb_release(struct fb_info *info, int user)
1182 {
1183         struct uvesafb_ktask *task = NULL;
1184         struct uvesafb_par *par = info->par;
1185         int cnt = atomic_read(&par->ref_count);
1186
1187         if (!cnt)
1188                 return -EINVAL;
1189
1190         if (cnt != 1)
1191                 goto out;
1192
1193         task = uvesafb_prep();
1194         if (!task)
1195                 goto out;
1196
1197         /* First, try to set the standard 80x25 text mode. */
1198         task->t.regs.eax = 0x0003;
1199         uvesafb_exec(task);
1200
1201         /*
1202          * Now try to restore whatever hardware state we might have
1203          * saved when the fb device was first opened.
1204          */
1205         uvesafb_vbe_state_restore(par, par->vbe_state_orig);
1206 out:
1207         atomic_dec(&par->ref_count);
1208         uvesafb_free(task);
1209         return 0;
1210 }
1211
1212 static int uvesafb_set_par(struct fb_info *info)
1213 {
1214         struct uvesafb_par *par = info->par;
1215         struct uvesafb_ktask *task = NULL;
1216         struct vbe_crtc_ib *crtc = NULL;
1217         struct vbe_mode_ib *mode = NULL;
1218         int i, err = 0, depth = info->var.bits_per_pixel;
1219
1220         if (depth > 8 && depth != 32)
1221                 depth = info->var.red.length + info->var.green.length +
1222                         info->var.blue.length;
1223
1224         i = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres, depth,
1225                                  UVESAFB_EXACT_RES | UVESAFB_EXACT_DEPTH);
1226         if (i >= 0)
1227                 mode = &par->vbe_modes[i];
1228         else
1229                 return -EINVAL;
1230
1231         task = uvesafb_prep();
1232         if (!task)
1233                 return -ENOMEM;
1234 setmode:
1235         task->t.regs.eax = 0x4f02;
1236         task->t.regs.ebx = mode->mode_id | 0x4000;      /* use LFB */
1237
1238         if (par->vbe_ib.vbe_version >= 0x0300 && !par->nocrtc &&
1239             info->var.pixclock != 0) {
1240                 task->t.regs.ebx |= 0x0800;             /* use CRTC data */
1241                 task->t.flags = TF_BUF_ESDI;
1242                 crtc = kzalloc(sizeof(struct vbe_crtc_ib), GFP_KERNEL);
1243                 if (!crtc) {
1244                         err = -ENOMEM;
1245                         goto out;
1246                 }
1247                 crtc->horiz_start = info->var.xres + info->var.right_margin;
1248                 crtc->horiz_end   = crtc->horiz_start + info->var.hsync_len;
1249                 crtc->horiz_total = crtc->horiz_end + info->var.left_margin;
1250
1251                 crtc->vert_start  = info->var.yres + info->var.lower_margin;
1252                 crtc->vert_end    = crtc->vert_start + info->var.vsync_len;
1253                 crtc->vert_total  = crtc->vert_end + info->var.upper_margin;
1254
1255                 crtc->pixel_clock = PICOS2KHZ(info->var.pixclock) * 1000;
1256                 crtc->refresh_rate = (u16)(100 * (crtc->pixel_clock /
1257                                 (crtc->vert_total * crtc->horiz_total)));
1258
1259                 if (info->var.vmode & FB_VMODE_DOUBLE)
1260                         crtc->flags |= 0x1;
1261                 if (info->var.vmode & FB_VMODE_INTERLACED)
1262                         crtc->flags |= 0x2;
1263                 if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
1264                         crtc->flags |= 0x4;
1265                 if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
1266                         crtc->flags |= 0x8;
1267                 memcpy(&par->crtc, crtc, sizeof(*crtc));
1268         } else {
1269                 memset(&par->crtc, 0, sizeof(*crtc));
1270         }
1271
1272         task->t.buf_len = sizeof(struct vbe_crtc_ib);
1273         task->buf = &par->crtc;
1274
1275         err = uvesafb_exec(task);
1276         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
1277                 /*
1278                  * The mode switch might have failed because we tried to
1279                  * use our own timings.  Try again with the default timings.
1280                  */
1281                 if (crtc != NULL) {
1282                         pr_warn("mode switch failed (eax=0x%x, err=%d) - trying again with default timings\n",
1283                                 task->t.regs.eax, err);
1284                         uvesafb_reset(task);
1285                         kfree(crtc);
1286                         crtc = NULL;
1287                         info->var.pixclock = 0;
1288                         goto setmode;
1289                 } else {
1290                         pr_err("mode switch failed (eax=0x%x, err=%d)\n",
1291                                task->t.regs.eax, err);
1292                         err = -EINVAL;
1293                         goto out;
1294                 }
1295         }
1296         par->mode_idx = i;
1297
1298         /* For 8bpp modes, always try to set the DAC to 8 bits. */
1299         if (par->vbe_ib.capabilities & VBE_CAP_CAN_SWITCH_DAC &&
1300             mode->bits_per_pixel <= 8) {
1301                 uvesafb_reset(task);
1302                 task->t.regs.eax = 0x4f08;
1303                 task->t.regs.ebx = 0x0800;
1304
1305                 err = uvesafb_exec(task);
1306                 if (err || (task->t.regs.eax & 0xffff) != 0x004f ||
1307                     ((task->t.regs.ebx & 0xff00) >> 8) != 8) {
1308                         dac_width = 6;
1309                 } else {
1310                         dac_width = 8;
1311                 }
1312         }
1313
1314         info->fix.visual = (info->var.bits_per_pixel == 8) ?
1315                                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
1316         info->fix.line_length = mode->bytes_per_scan_line;
1317
1318 out:
1319         kfree(crtc);
1320         uvesafb_free(task);
1321
1322         return err;
1323 }
1324
1325 static void uvesafb_check_limits(struct fb_var_screeninfo *var,
1326                 struct fb_info *info)
1327 {
1328         const struct fb_videomode *mode;
1329         struct uvesafb_par *par = info->par;
1330
1331         /*
1332          * If pixclock is set to 0, then we're using default BIOS timings
1333          * and thus don't have to perform any checks here.
1334          */
1335         if (!var->pixclock)
1336                 return;
1337
1338         if (par->vbe_ib.vbe_version < 0x0300) {
1339                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, var, info);
1340                 return;
1341         }
1342
1343         if (!fb_validate_mode(var, info))
1344                 return;
1345
1346         mode = fb_find_best_mode(var, &info->modelist);
1347         if (mode) {
1348                 if (mode->xres == var->xres && mode->yres == var->yres &&
1349                     !(mode->vmode & (FB_VMODE_INTERLACED | FB_VMODE_DOUBLE))) {
1350                         fb_videomode_to_var(var, mode);
1351                         return;
1352                 }
1353         }
1354
1355         if (info->monspecs.gtf && !fb_get_mode(FB_MAXTIMINGS, 0, var, info))
1356                 return;
1357         /* Use default refresh rate */
1358         var->pixclock = 0;
1359 }
1360
1361 static int uvesafb_check_var(struct fb_var_screeninfo *var,
1362                 struct fb_info *info)
1363 {
1364         struct uvesafb_par *par = info->par;
1365         struct vbe_mode_ib *mode = NULL;
1366         int match = -1;
1367         int depth = var->red.length + var->green.length + var->blue.length;
1368
1369         /*
1370          * Various apps will use bits_per_pixel to set the color depth,
1371          * which is theoretically incorrect, but which we'll try to handle
1372          * here.
1373          */
1374         if (depth == 0 || abs(depth - var->bits_per_pixel) >= 8)
1375                 depth = var->bits_per_pixel;
1376
1377         match = uvesafb_vbe_find_mode(par, var->xres, var->yres, depth,
1378                                                 UVESAFB_EXACT_RES);
1379         if (match == -1)
1380                 return -EINVAL;
1381
1382         mode = &par->vbe_modes[match];
1383         uvesafb_setup_var(var, info, mode);
1384
1385         /*
1386          * Check whether we have remapped enough memory for this mode.
1387          * We might be called at an early stage, when we haven't remapped
1388          * any memory yet, in which case we simply skip the check.
1389          */
1390         if (var->yres * mode->bytes_per_scan_line > info->fix.smem_len
1391                                                 && info->fix.smem_len)
1392                 return -EINVAL;
1393
1394         if ((var->vmode & FB_VMODE_DOUBLE) &&
1395                                 !(par->vbe_modes[match].mode_attr & 0x100))
1396                 var->vmode &= ~FB_VMODE_DOUBLE;
1397
1398         if ((var->vmode & FB_VMODE_INTERLACED) &&
1399                                 !(par->vbe_modes[match].mode_attr & 0x200))
1400                 var->vmode &= ~FB_VMODE_INTERLACED;
1401
1402         uvesafb_check_limits(var, info);
1403
1404         var->xres_virtual = var->xres;
1405         var->yres_virtual = (par->ypan) ?
1406                                 info->fix.smem_len / mode->bytes_per_scan_line :
1407                                 var->yres;
1408         return 0;
1409 }
1410
1411 static struct fb_ops uvesafb_ops = {
1412         .owner          = THIS_MODULE,
1413         .fb_open        = uvesafb_open,
1414         .fb_release     = uvesafb_release,
1415         .fb_setcolreg   = uvesafb_setcolreg,
1416         .fb_setcmap     = uvesafb_setcmap,
1417         .fb_pan_display = uvesafb_pan_display,
1418         .fb_blank       = uvesafb_blank,
1419         .fb_fillrect    = cfb_fillrect,
1420         .fb_copyarea    = cfb_copyarea,
1421         .fb_imageblit   = cfb_imageblit,
1422         .fb_check_var   = uvesafb_check_var,
1423         .fb_set_par     = uvesafb_set_par,
1424 };
1425
1426 static void uvesafb_init_info(struct fb_info *info, struct vbe_mode_ib *mode)
1427 {
1428         unsigned int size_vmode;
1429         unsigned int size_remap;
1430         unsigned int size_total;
1431         struct uvesafb_par *par = info->par;
1432         int i, h;
1433
1434         info->pseudo_palette = ((u8 *)info->par + sizeof(struct uvesafb_par));
1435         info->fix = uvesafb_fix;
1436         info->fix.ypanstep = par->ypan ? 1 : 0;
1437         info->fix.ywrapstep = (par->ypan > 1) ? 1 : 0;
1438
1439         /* Disable blanking if the user requested so. */
1440         if (!blank)
1441                 info->fbops->fb_blank = NULL;
1442
1443         /*
1444          * Find out how much IO memory is required for the mode with
1445          * the highest resolution.
1446          */
1447         size_remap = 0;
1448         for (i = 0; i < par->vbe_modes_cnt; i++) {
1449                 h = par->vbe_modes[i].bytes_per_scan_line *
1450                                         par->vbe_modes[i].y_res;
1451                 if (h > size_remap)
1452                         size_remap = h;
1453         }
1454         size_remap *= 2;
1455
1456         /*
1457          *   size_vmode -- that is the amount of memory needed for the
1458          *                 used video mode, i.e. the minimum amount of
1459          *                 memory we need.
1460          */
1461         size_vmode = info->var.yres * mode->bytes_per_scan_line;
1462
1463         /*
1464          *   size_total -- all video memory we have. Used for mtrr
1465          *                 entries, resource allocation and bounds
1466          *                 checking.
1467          */
1468         size_total = par->vbe_ib.total_memory * 65536;
1469         if (vram_total)
1470                 size_total = vram_total * 1024 * 1024;
1471         if (size_total < size_vmode)
1472                 size_total = size_vmode;
1473
1474         /*
1475          *   size_remap -- the amount of video memory we are going to
1476          *                 use for vesafb.  With modern cards it is no
1477          *                 option to simply use size_total as th
1478          *                 wastes plenty of kernel address space.
1479          */
1480         if (vram_remap)
1481                 size_remap = vram_remap * 1024 * 1024;
1482         if (size_remap < size_vmode)
1483                 size_remap = size_vmode;
1484         if (size_remap > size_total)
1485                 size_remap = size_total;
1486
1487         info->fix.smem_len = size_remap;
1488         info->fix.smem_start = mode->phys_base_ptr;
1489
1490         /*
1491          * We have to set yres_virtual here because when setup_var() was
1492          * called, smem_len wasn't defined yet.
1493          */
1494         info->var.yres_virtual = info->fix.smem_len /
1495                                  mode->bytes_per_scan_line;
1496
1497         if (par->ypan && info->var.yres_virtual > info->var.yres) {
1498                 pr_info("scrolling: %s using protected mode interface, yres_virtual=%d\n",
1499                         (par->ypan > 1) ? "ywrap" : "ypan",
1500                         info->var.yres_virtual);
1501         } else {
1502                 pr_info("scrolling: redraw\n");
1503                 info->var.yres_virtual = info->var.yres;
1504                 par->ypan = 0;
1505         }
1506
1507         info->flags = FBINFO_FLAG_DEFAULT |
1508                         (par->ypan ? FBINFO_HWACCEL_YPAN : 0);
1509
1510         if (!par->ypan)
1511                 info->fbops->fb_pan_display = NULL;
1512 }
1513
1514 static void uvesafb_init_mtrr(struct fb_info *info)
1515 {
1516         struct uvesafb_par *par = info->par;
1517
1518         if (mtrr && !(info->fix.smem_start & (PAGE_SIZE - 1))) {
1519                 int temp_size = info->fix.smem_len;
1520
1521                 int rc;
1522
1523                 /* Find the largest power-of-two */
1524                 temp_size = roundup_pow_of_two(temp_size);
1525
1526                 /* Try and find a power of two to add */
1527                 do {
1528                         rc = arch_phys_wc_add(info->fix.smem_start, temp_size);
1529                         temp_size >>= 1;
1530                 } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
1531
1532                 if (rc >= 0)
1533                         par->mtrr_handle = rc;
1534         }
1535 }
1536
1537 static void uvesafb_ioremap(struct fb_info *info)
1538 {
1539         info->screen_base = ioremap_wc(info->fix.smem_start, info->fix.smem_len);
1540 }
1541
1542 static ssize_t uvesafb_show_vbe_ver(struct device *dev,
1543                 struct device_attribute *attr, char *buf)
1544 {
1545         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1546         struct uvesafb_par *par = info->par;
1547
1548         return snprintf(buf, PAGE_SIZE, "%.4x\n", par->vbe_ib.vbe_version);
1549 }
1550
1551 static DEVICE_ATTR(vbe_version, S_IRUGO, uvesafb_show_vbe_ver, NULL);
1552
1553 static ssize_t uvesafb_show_vbe_modes(struct device *dev,
1554                 struct device_attribute *attr, char *buf)
1555 {
1556         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1557         struct uvesafb_par *par = info->par;
1558         int ret = 0, i;
1559
1560         for (i = 0; i < par->vbe_modes_cnt && ret < PAGE_SIZE; i++) {
1561                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
1562                         "%dx%d-%d, 0x%.4x\n",
1563                         par->vbe_modes[i].x_res, par->vbe_modes[i].y_res,
1564                         par->vbe_modes[i].depth, par->vbe_modes[i].mode_id);
1565         }
1566
1567         return ret;
1568 }
1569
1570 static DEVICE_ATTR(vbe_modes, S_IRUGO, uvesafb_show_vbe_modes, NULL);
1571
1572 static ssize_t uvesafb_show_vendor(struct device *dev,
1573                 struct device_attribute *attr, char *buf)
1574 {
1575         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1576         struct uvesafb_par *par = info->par;
1577
1578         if (par->vbe_ib.oem_vendor_name_ptr)
1579                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1580                         (&par->vbe_ib) + par->vbe_ib.oem_vendor_name_ptr);
1581         else
1582                 return 0;
1583 }
1584
1585 static DEVICE_ATTR(oem_vendor, S_IRUGO, uvesafb_show_vendor, NULL);
1586
1587 static ssize_t uvesafb_show_product_name(struct device *dev,
1588                 struct device_attribute *attr, char *buf)
1589 {
1590         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1591         struct uvesafb_par *par = info->par;
1592
1593         if (par->vbe_ib.oem_product_name_ptr)
1594                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1595                         (&par->vbe_ib) + par->vbe_ib.oem_product_name_ptr);
1596         else
1597                 return 0;
1598 }
1599
1600 static DEVICE_ATTR(oem_product_name, S_IRUGO, uvesafb_show_product_name, NULL);
1601
1602 static ssize_t uvesafb_show_product_rev(struct device *dev,
1603                 struct device_attribute *attr, char *buf)
1604 {
1605         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1606         struct uvesafb_par *par = info->par;
1607
1608         if (par->vbe_ib.oem_product_rev_ptr)
1609                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1610                         (&par->vbe_ib) + par->vbe_ib.oem_product_rev_ptr);
1611         else
1612                 return 0;
1613 }
1614
1615 static DEVICE_ATTR(oem_product_rev, S_IRUGO, uvesafb_show_product_rev, NULL);
1616
1617 static ssize_t uvesafb_show_oem_string(struct device *dev,
1618                 struct device_attribute *attr, char *buf)
1619 {
1620         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1621         struct uvesafb_par *par = info->par;
1622
1623         if (par->vbe_ib.oem_string_ptr)
1624                 return snprintf(buf, PAGE_SIZE, "%s\n",
1625                         (char *)(&par->vbe_ib) + par->vbe_ib.oem_string_ptr);
1626         else
1627                 return 0;
1628 }
1629
1630 static DEVICE_ATTR(oem_string, S_IRUGO, uvesafb_show_oem_string, NULL);
1631
1632 static ssize_t uvesafb_show_nocrtc(struct device *dev,
1633                 struct device_attribute *attr, char *buf)
1634 {
1635         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1636         struct uvesafb_par *par = info->par;
1637
1638         return snprintf(buf, PAGE_SIZE, "%d\n", par->nocrtc);
1639 }
1640
1641 static ssize_t uvesafb_store_nocrtc(struct device *dev,
1642                 struct device_attribute *attr, const char *buf, size_t count)
1643 {
1644         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1645         struct uvesafb_par *par = info->par;
1646
1647         if (count > 0) {
1648                 if (buf[0] == '0')
1649                         par->nocrtc = 0;
1650                 else
1651                         par->nocrtc = 1;
1652         }
1653         return count;
1654 }
1655
1656 static DEVICE_ATTR(nocrtc, S_IRUGO | S_IWUSR, uvesafb_show_nocrtc,
1657                         uvesafb_store_nocrtc);
1658
1659 static struct attribute *uvesafb_dev_attrs[] = {
1660         &dev_attr_vbe_version.attr,
1661         &dev_attr_vbe_modes.attr,
1662         &dev_attr_oem_vendor.attr,
1663         &dev_attr_oem_product_name.attr,
1664         &dev_attr_oem_product_rev.attr,
1665         &dev_attr_oem_string.attr,
1666         &dev_attr_nocrtc.attr,
1667         NULL,
1668 };
1669
1670 static const struct attribute_group uvesafb_dev_attgrp = {
1671         .name = NULL,
1672         .attrs = uvesafb_dev_attrs,
1673 };
1674
1675 static int uvesafb_probe(struct platform_device *dev)
1676 {
1677         struct fb_info *info;
1678         struct vbe_mode_ib *mode = NULL;
1679         struct uvesafb_par *par;
1680         int err = 0, i;
1681
1682         info = framebuffer_alloc(sizeof(*par) + sizeof(u32) * 256, &dev->dev);
1683         if (!info)
1684                 return -ENOMEM;
1685
1686         par = info->par;
1687
1688         err = uvesafb_vbe_init(info);
1689         if (err) {
1690                 pr_err("vbe_init() failed with %d\n", err);
1691                 goto out;
1692         }
1693
1694         info->fbops = &uvesafb_ops;
1695
1696         i = uvesafb_vbe_init_mode(info);
1697         if (i < 0) {
1698                 err = -EINVAL;
1699                 goto out;
1700         } else {
1701                 mode = &par->vbe_modes[i];
1702         }
1703
1704         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
1705                 err = -ENXIO;
1706                 goto out;
1707         }
1708
1709         uvesafb_init_info(info, mode);
1710
1711         if (!request_region(0x3c0, 32, "uvesafb")) {
1712                 pr_err("request region 0x3c0-0x3e0 failed\n");
1713                 err = -EIO;
1714                 goto out_mode;
1715         }
1716
1717         if (!request_mem_region(info->fix.smem_start, info->fix.smem_len,
1718                                 "uvesafb")) {
1719                 pr_err("cannot reserve video memory at 0x%lx\n",
1720                        info->fix.smem_start);
1721                 err = -EIO;
1722                 goto out_reg;
1723         }
1724
1725         uvesafb_init_mtrr(info);
1726         uvesafb_ioremap(info);
1727
1728         if (!info->screen_base) {
1729                 pr_err("abort, cannot ioremap 0x%x bytes of video memory at 0x%lx\n",
1730                        info->fix.smem_len, info->fix.smem_start);
1731                 err = -EIO;
1732                 goto out_mem;
1733         }
1734
1735         platform_set_drvdata(dev, info);
1736
1737         if (register_framebuffer(info) < 0) {
1738                 pr_err("failed to register framebuffer device\n");
1739                 err = -EINVAL;
1740                 goto out_unmap;
1741         }
1742
1743         pr_info("framebuffer at 0x%lx, mapped to 0x%p, using %dk, total %dk\n",
1744                 info->fix.smem_start, info->screen_base,
1745                 info->fix.smem_len / 1024, par->vbe_ib.total_memory * 64);
1746         fb_info(info, "%s frame buffer device\n", info->fix.id);
1747
1748         err = sysfs_create_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1749         if (err != 0)
1750                 fb_warn(info, "failed to register attributes\n");
1751
1752         return 0;
1753
1754 out_unmap:
1755         iounmap(info->screen_base);
1756 out_mem:
1757         release_mem_region(info->fix.smem_start, info->fix.smem_len);
1758 out_reg:
1759         release_region(0x3c0, 32);
1760 out_mode:
1761         if (!list_empty(&info->modelist))
1762                 fb_destroy_modelist(&info->modelist);
1763         fb_destroy_modedb(info->monspecs.modedb);
1764         fb_dealloc_cmap(&info->cmap);
1765 out:
1766         kfree(par->vbe_modes);
1767
1768         framebuffer_release(info);
1769         return err;
1770 }
1771
1772 static int uvesafb_remove(struct platform_device *dev)
1773 {
1774         struct fb_info *info = platform_get_drvdata(dev);
1775
1776         if (info) {
1777                 struct uvesafb_par *par = info->par;
1778
1779                 sysfs_remove_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1780                 unregister_framebuffer(info);
1781                 release_region(0x3c0, 32);
1782                 iounmap(info->screen_base);
1783                 arch_phys_wc_del(par->mtrr_handle);
1784                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1785                 fb_destroy_modedb(info->monspecs.modedb);
1786                 fb_dealloc_cmap(&info->cmap);
1787
1788                 kfree(par->vbe_modes);
1789                 kfree(par->vbe_state_orig);
1790                 kfree(par->vbe_state_saved);
1791
1792                 framebuffer_release(info);
1793         }
1794         return 0;
1795 }
1796
1797 static struct platform_driver uvesafb_driver = {
1798         .probe  = uvesafb_probe,
1799         .remove = uvesafb_remove,
1800         .driver = {
1801                 .name = "uvesafb",
1802         },
1803 };
1804
1805 static struct platform_device *uvesafb_device;
1806
1807 #ifndef MODULE
1808 static int uvesafb_setup(char *options)
1809 {
1810         char *this_opt;
1811
1812         if (!options || !*options)
1813                 return 0;
1814
1815         while ((this_opt = strsep(&options, ",")) != NULL) {
1816                 if (!*this_opt) continue;
1817
1818                 if (!strcmp(this_opt, "redraw"))
1819                         ypan = 0;
1820                 else if (!strcmp(this_opt, "ypan"))
1821                         ypan = 1;
1822                 else if (!strcmp(this_opt, "ywrap"))
1823                         ypan = 2;
1824                 else if (!strcmp(this_opt, "vgapal"))
1825                         pmi_setpal = 0;
1826                 else if (!strcmp(this_opt, "pmipal"))
1827                         pmi_setpal = 1;
1828                 else if (!strncmp(this_opt, "mtrr:", 5))
1829                         mtrr = simple_strtoul(this_opt+5, NULL, 0);
1830                 else if (!strcmp(this_opt, "nomtrr"))
1831                         mtrr = 0;
1832                 else if (!strcmp(this_opt, "nocrtc"))
1833                         nocrtc = 1;
1834                 else if (!strcmp(this_opt, "noedid"))
1835                         noedid = 1;
1836                 else if (!strcmp(this_opt, "noblank"))
1837                         blank = 0;
1838                 else if (!strncmp(this_opt, "vtotal:", 7))
1839                         vram_total = simple_strtoul(this_opt + 7, NULL, 0);
1840                 else if (!strncmp(this_opt, "vremap:", 7))
1841                         vram_remap = simple_strtoul(this_opt + 7, NULL, 0);
1842                 else if (!strncmp(this_opt, "maxhf:", 6))
1843                         maxhf = simple_strtoul(this_opt + 6, NULL, 0);
1844                 else if (!strncmp(this_opt, "maxvf:", 6))
1845                         maxvf = simple_strtoul(this_opt + 6, NULL, 0);
1846                 else if (!strncmp(this_opt, "maxclk:", 7))
1847                         maxclk = simple_strtoul(this_opt + 7, NULL, 0);
1848                 else if (!strncmp(this_opt, "vbemode:", 8))
1849                         vbemode = simple_strtoul(this_opt + 8, NULL, 0);
1850                 else if (this_opt[0] >= '0' && this_opt[0] <= '9') {
1851                         mode_option = this_opt;
1852                 } else {
1853                         pr_warn("unrecognized option %s\n", this_opt);
1854                 }
1855         }
1856
1857         if (mtrr != 3 && mtrr != 0)
1858                 pr_warn("uvesafb: mtrr should be set to 0 or 3; %d is unsupported", mtrr);
1859
1860         return 0;
1861 }
1862 #endif /* !MODULE */
1863
1864 static ssize_t v86d_show(struct device_driver *dev, char *buf)
1865 {
1866         return snprintf(buf, PAGE_SIZE, "%s\n", v86d_path);
1867 }
1868
1869 static ssize_t v86d_store(struct device_driver *dev, const char *buf,
1870                 size_t count)
1871 {
1872         strncpy(v86d_path, buf, PATH_MAX);
1873         return count;
1874 }
1875 static DRIVER_ATTR_RW(v86d);
1876
1877 static int uvesafb_init(void)
1878 {
1879         int err;
1880
1881 #ifndef MODULE
1882         char *option = NULL;
1883
1884         if (fb_get_options("uvesafb", &option))
1885                 return -ENODEV;
1886         uvesafb_setup(option);
1887 #endif
1888         err = cn_add_callback(&uvesafb_cn_id, "uvesafb", uvesafb_cn_callback);
1889         if (err)
1890                 return err;
1891
1892         err = platform_driver_register(&uvesafb_driver);
1893
1894         if (!err) {
1895                 uvesafb_device = platform_device_alloc("uvesafb", 0);
1896                 if (uvesafb_device)
1897                         err = platform_device_add(uvesafb_device);
1898                 else
1899                         err = -ENOMEM;
1900
1901                 if (err) {
1902                         platform_device_put(uvesafb_device);
1903                         platform_driver_unregister(&uvesafb_driver);
1904                         cn_del_callback(&uvesafb_cn_id);
1905                         return err;
1906                 }
1907
1908                 err = driver_create_file(&uvesafb_driver.driver,
1909                                 &driver_attr_v86d);
1910                 if (err) {
1911                         pr_warn("failed to register attributes\n");
1912                         err = 0;
1913                 }
1914         }
1915         return err;
1916 }
1917
1918 module_init(uvesafb_init);
1919
1920 static void uvesafb_exit(void)
1921 {
1922         struct uvesafb_ktask *task;
1923
1924         if (v86d_started) {
1925                 task = uvesafb_prep();
1926                 if (task) {
1927                         task->t.flags = TF_EXIT;
1928                         uvesafb_exec(task);
1929                         uvesafb_free(task);
1930                 }
1931         }
1932
1933         cn_del_callback(&uvesafb_cn_id);
1934         driver_remove_file(&uvesafb_driver.driver, &driver_attr_v86d);
1935         platform_device_unregister(uvesafb_device);
1936         platform_driver_unregister(&uvesafb_driver);
1937 }
1938
1939 module_exit(uvesafb_exit);
1940
1941 static int param_set_scroll(const char *val, const struct kernel_param *kp)
1942 {
1943         ypan = 0;
1944
1945         if (!strcmp(val, "redraw"))
1946                 ypan = 0;
1947         else if (!strcmp(val, "ypan"))
1948                 ypan = 1;
1949         else if (!strcmp(val, "ywrap"))
1950                 ypan = 2;
1951         else
1952                 return -EINVAL;
1953
1954         return 0;
1955 }
1956 static const struct kernel_param_ops param_ops_scroll = {
1957         .set = param_set_scroll,
1958 };
1959 #define param_check_scroll(name, p) __param_check(name, p, void)
1960
1961 module_param_named(scroll, ypan, scroll, 0);
1962 MODULE_PARM_DESC(scroll,
1963         "Scrolling mode, set to 'redraw', 'ypan', or 'ywrap'");
1964 module_param_named(vgapal, pmi_setpal, invbool, 0);
1965 MODULE_PARM_DESC(vgapal, "Set palette using VGA registers");
1966 module_param_named(pmipal, pmi_setpal, bool, 0);
1967 MODULE_PARM_DESC(pmipal, "Set palette using PMI calls");
1968 module_param(mtrr, uint, 0);
1969 MODULE_PARM_DESC(mtrr,
1970         "Memory Type Range Registers setting. Use 0 to disable.");
1971 module_param(blank, bool, 0);
1972 MODULE_PARM_DESC(blank, "Enable hardware blanking");
1973 module_param(nocrtc, bool, 0);
1974 MODULE_PARM_DESC(nocrtc, "Ignore CRTC timings when setting modes");
1975 module_param(noedid, bool, 0);
1976 MODULE_PARM_DESC(noedid,
1977         "Ignore EDID-provided monitor limits when setting modes");
1978 module_param(vram_remap, uint, 0);
1979 MODULE_PARM_DESC(vram_remap, "Set amount of video memory to be used [MiB]");
1980 module_param(vram_total, uint, 0);
1981 MODULE_PARM_DESC(vram_total, "Set total amount of video memoery [MiB]");
1982 module_param(maxclk, ushort, 0);
1983 MODULE_PARM_DESC(maxclk, "Maximum pixelclock [MHz], overrides EDID data");
1984 module_param(maxhf, ushort, 0);
1985 MODULE_PARM_DESC(maxhf,
1986         "Maximum horizontal frequency [kHz], overrides EDID data");
1987 module_param(maxvf, ushort, 0);
1988 MODULE_PARM_DESC(maxvf,
1989         "Maximum vertical frequency [Hz], overrides EDID data");
1990 module_param(mode_option, charp, 0);
1991 MODULE_PARM_DESC(mode_option,
1992         "Specify initial video mode as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");
1993 module_param(vbemode, ushort, 0);
1994 MODULE_PARM_DESC(vbemode,
1995         "VBE mode number to set, overrides the 'mode' option");
1996 module_param_string(v86d, v86d_path, PATH_MAX, 0660);
1997 MODULE_PARM_DESC(v86d, "Path to the v86d userspace helper.");
1998
1999 MODULE_LICENSE("GPL");
2000 MODULE_AUTHOR("Michal Januszewski <spock@gentoo.org>");
2001 MODULE_DESCRIPTION("Framebuffer driver for VBE2.0+ compliant graphics boards");
2002