drivers/video/fbdev/uvesafb.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * A framebuffer driver for VBE 2.0+ compliant video cards
   4  *
   5  * (c) 2007 Michal Januszewski <spock@gentoo.org>
   6  *     Loosely based upon the vesafb driver.
   7  *
   8  */
   9
  10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11
  12 #include <linux/init.h>
  13 #include <linux/module.h>
  14 #include <linux/moduleparam.h>
  15 #include <linux/skbuff.h>
  16 #include <linux/timer.h>
  17 #include <linux/completion.h>
  18 #include <linux/connector.h>
  19 #include <linux/random.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/limits.h>
  22 #include <linux/fb.h>
  23 #include <linux/io.h>
  24 #include <linux/mutex.h>
  25 #include <linux/slab.h>
  26 #include <video/edid.h>
  27 #include <video/uvesafb.h>
  28 #ifdef CONFIG_X86
  29 #include <video/vga.h>
  30 #endif
  31 #include "edid.h"
  32
  33 static struct cb_id uvesafb_cn_id = {
  34         .idx = CN_IDX_V86D,
  35         .val = CN_VAL_V86D_UVESAFB
  36 };
  37 static char v86d_path[PATH_MAX] = "/sbin/v86d";
  38 static char v86d_started;       /* has v86d been started by uvesafb? */
  39
  40 static const struct fb_fix_screeninfo uvesafb_fix = {
  41         .id     = "VESA VGA",
  42         .type   = FB_TYPE_PACKED_PIXELS,
  43         .accel  = FB_ACCEL_NONE,
  44         .visual = FB_VISUAL_TRUECOLOR,
  45 };
  46
  47 static int mtrr         = 3;    /* enable mtrr by default */
  48 static bool blank       = true; /* enable blanking by default */
  49 static int ypan         = 1;    /* 0: scroll, 1: ypan, 2: ywrap */
  50 static bool pmi_setpal  = true; /* use PMI for palette changes */
  51 static bool nocrtc;             /* ignore CRTC settings */
  52 static bool noedid;             /* don't try DDC transfers */
  53 static int vram_remap;          /* set amt. of memory to be used */
  54 static int vram_total;          /* set total amount of memory */
  55 static u16 maxclk;              /* maximum pixel clock */
  56 static u16 maxvf;               /* maximum vertical frequency */
  57 static u16 maxhf;               /* maximum horizontal frequency */
  58 static u16 vbemode;             /* force use of a specific VBE mode */
  59 static char *mode_option;
  60 static u8  dac_width    = 6;
  61
  62 static struct uvesafb_ktask *uvfb_tasks[UVESAFB_TASKS_MAX];
  63 static DEFINE_MUTEX(uvfb_lock);
  64
  65 /*
  66  * A handler for replies from userspace.
  67  *
  68  * Make sure each message passes consistency checks and if it does,
  69  * find the kernel part of the task struct, copy the registers and
  70  * the buffer contents and then complete the task.
  71  */
  72 static void uvesafb_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
  73 {
  74         struct uvesafb_task *utask;
  75         struct uvesafb_ktask *task;
  76
  77         if (!capable(CAP_SYS_ADMIN))
  78                 return;
  79
  80         if (msg->seq >= UVESAFB_TASKS_MAX)
  81                 return;
  82
  83         mutex_lock(&uvfb_lock);
  84         task = uvfb_tasks[msg->seq];
  85
  86         if (!task || msg->ack != task->ack) {
  87                 mutex_unlock(&uvfb_lock);
  88                 return;
  89         }
  90
  91         utask = (struct uvesafb_task *)msg->data;
  92
  93         /* Sanity checks for the buffer length. */
  94         if (task->t.buf_len < utask->buf_len ||
  95             utask->buf_len > msg->len - sizeof(*utask)) {
  96                 mutex_unlock(&uvfb_lock);
  97                 return;
  98         }
  99
 100         uvfb_tasks[msg->seq] = NULL;
 101         mutex_unlock(&uvfb_lock);
 102
 103         memcpy(&task->t, utask, sizeof(*utask));
 104
 105         if (task->t.buf_len && task->buf)
 106                 memcpy(task->buf, utask + 1, task->t.buf_len);
 107
 108         complete(task->done);
 109         return;
 110 }
 111
 112 static int uvesafb_helper_start(void)
 113 {
 114         char *envp[] = {
 115                 "HOME=/",
 116                 "PATH=/sbin:/bin",
 117                 NULL,
 118         };
 119
 120         char *argv[] = {
 121                 v86d_path,
 122                 NULL,
 123         };
 124
 125         return call_usermodehelper(v86d_path, argv, envp, UMH_WAIT_PROC);
 126 }
 127
 128 /*
 129  * Execute a uvesafb task.
 130  *
 131  * Returns 0 if the task is executed successfully.
 132  *
 133  * A message sent to the userspace consists of the uvesafb_task
 134  * struct and (optionally) a buffer. The uvesafb_task struct is
 135  * a simplified version of uvesafb_ktask (its kernel counterpart)
 136  * containing only the register values, flags and the length of
 137  * the buffer.
 138  *
 139  * Each message is assigned a sequence number (increased linearly)
 140  * and a random ack number. The sequence number is used as a key
 141  * for the uvfb_tasks array which holds pointers to uvesafb_ktask
 142  * structs for all requests.
 143  */
 144 static int uvesafb_exec(struct uvesafb_ktask *task)
 145 {
 146         static int seq;
 147         struct cn_msg *m;
 148         int err;
 149         int len = sizeof(task->t) + task->t.buf_len;
 150
 151         /*
 152          * Check whether the message isn't longer than the maximum
 153          * allowed by connector.
 154          */
 155         if (sizeof(*m) + len > CONNECTOR_MAX_MSG_SIZE) {
 156                 pr_warn("message too long (%d), can't execute task\n",
 157                         (int)(sizeof(*m) + len));
 158                 return -E2BIG;
 159         }
 160
 161         m = kzalloc(sizeof(*m) + len, GFP_KERNEL);
 162         if (!m)
 163                 return -ENOMEM;
 164
 165         init_completion(task->done);
 166
 167         memcpy(&m->id, &uvesafb_cn_id, sizeof(m->id));
 168         m->seq = seq;
 169         m->len = len;
 170         m->ack = prandom_u32();
 171
 172         /* uvesafb_task structure */
 173         memcpy(m + 1, &task->t, sizeof(task->t));
 174
 175         /* Buffer */
 176         memcpy((u8 *)(m + 1) + sizeof(task->t), task->buf, task->t.buf_len);
 177
 178         /*
 179          * Save the message ack number so that we can find the kernel
 180          * part of this task when a reply is received from userspace.
 181          */
 182         task->ack = m->ack;
 183
 184         mutex_lock(&uvfb_lock);
 185
 186         /* If all slots are taken -- bail out. */
 187         if (uvfb_tasks[seq]) {
 188                 mutex_unlock(&uvfb_lock);
 189                 err = -EBUSY;
 190                 goto out;
 191         }
 192
 193         /* Save a pointer to the kernel part of the task struct. */
 194         uvfb_tasks[seq] = task;
 195         mutex_unlock(&uvfb_lock);
 196
 197         err = cn_netlink_send(m, 0, 0, GFP_KERNEL);
 198         if (err == -ESRCH) {
 199                 /*
 200                  * Try to start the userspace helper if sending
 201                  * the request failed the first time.
 202                  */
 203                 err = uvesafb_helper_start();
 204                 if (err) {
 205                         pr_err("failed to execute %s\n", v86d_path);
 206                         pr_err("make sure that the v86d helper is installed and executable\n");
 207                 } else {
 208                         v86d_started = 1;
 209                         err = cn_netlink_send(m, 0, 0, gfp_any());
 210                         if (err == -ENOBUFS)
 211                                 err = 0;
 212                 }
 213         } else if (err == -ENOBUFS)
 214                 err = 0;
 215
 216         if (!err && !(task->t.flags & TF_EXIT))
 217                 err = !wait_for_completion_timeout(task->done,
 218                                 msecs_to_jiffies(UVESAFB_TIMEOUT));
 219
 220         mutex_lock(&uvfb_lock);
 221         uvfb_tasks[seq] = NULL;
 222         mutex_unlock(&uvfb_lock);
 223
 224         seq++;
 225         if (seq >= UVESAFB_TASKS_MAX)
 226                 seq = 0;
 227 out:
 228         kfree(m);
 229         return err;
 230 }
 231
 232 /*
 233  * Free a uvesafb_ktask struct.
 234  */
 235 static void uvesafb_free(struct uvesafb_ktask *task)
 236 {
 237         if (task) {
 238                 kfree(task->done);
 239                 kfree(task);
 240         }
 241 }
 242
 243 /*
 244  * Prepare a uvesafb_ktask struct to be used again.
 245  */
 246 static void uvesafb_reset(struct uvesafb_ktask *task)
 247 {
 248         struct completion *cpl = task->done;
 249
 250         memset(task, 0, sizeof(*task));
 251         task->done = cpl;
 252 }
 253
 254 /*
 255  * Allocate and prepare a uvesafb_ktask struct.
 256  */
 257 static struct uvesafb_ktask *uvesafb_prep(void)
 258 {
 259         struct uvesafb_ktask *task;
 260
 261         task = kzalloc(sizeof(*task), GFP_KERNEL);
 262         if (task) {
 263                 task->done = kzalloc(sizeof(*task->done), GFP_KERNEL);
 264                 if (!task->done) {
 265                         kfree(task);
 266                         task = NULL;
 267                 }
 268         }
 269         return task;
 270 }
 271
 272 static void uvesafb_setup_var(struct fb_var_screeninfo *var,
 273                 struct fb_info *info, struct vbe_mode_ib *mode)
 274 {
 275         struct uvesafb_par *par = info->par;
 276
 277         var->vmode = FB_VMODE_NONINTERLACED;
 278         var->sync = FB_SYNC_VERT_HIGH_ACT;
 279
 280         var->xres = mode->x_res;
 281         var->yres = mode->y_res;
 282         var->xres_virtual = mode->x_res;
 283         var->yres_virtual = (par->ypan) ?
 284                         info->fix.smem_len / mode->bytes_per_scan_line :
 285                         mode->y_res;
 286         var->xoffset = 0;
 287         var->yoffset = 0;
 288         var->bits_per_pixel = mode->bits_per_pixel;
 289
 290         if (var->bits_per_pixel == 15)
 291                 var->bits_per_pixel = 16;
 292
 293         if (var->bits_per_pixel > 8) {
 294                 var->red.offset    = mode->red_off;
 295                 var->red.length    = mode->red_len;
 296                 var->green.offset  = mode->green_off;
 297                 var->green.length  = mode->green_len;
 298                 var->blue.offset   = mode->blue_off;
 299                 var->blue.length   = mode->blue_len;
 300                 var->transp.offset = mode->rsvd_off;
 301                 var->transp.length = mode->rsvd_len;
 302         } else {
 303                 var->red.offset    = 0;
 304                 var->green.offset  = 0;
 305                 var->blue.offset   = 0;
 306                 var->transp.offset = 0;
 307
 308                 var->red.length    = 8;
 309                 var->green.length  = 8;
 310                 var->blue.length   = 8;
 311                 var->transp.length = 0;
 312         }
 313 }
 314
 315 static int uvesafb_vbe_find_mode(struct uvesafb_par *par,
 316                 int xres, int yres, int depth, unsigned char flags)
 317 {
 318         int i, match = -1, h = 0, d = 0x7fffffff;
 319
 320         for (i = 0; i < par->vbe_modes_cnt; i++) {
 321                 h = abs(par->vbe_modes[i].x_res - xres) +
 322                     abs(par->vbe_modes[i].y_res - yres) +
 323                     abs(depth - par->vbe_modes[i].depth);
 324
 325                 /*
 326                  * We have an exact match in terms of resolution
 327                  * and depth.
 328                  */
 329                 if (h == 0)
 330                         return i;
 331
 332                 if (h < d || (h == d && par->vbe_modes[i].depth > depth)) {
 333                         d = h;
 334                         match = i;
 335                 }
 336         }
 337         i = 1;
 338
 339         if (flags & UVESAFB_EXACT_DEPTH &&
 340                         par->vbe_modes[match].depth != depth)
 341                 i = 0;
 342
 343         if (flags & UVESAFB_EXACT_RES && d > 24)
 344                 i = 0;
 345
 346         if (i != 0)
 347                 return match;
 348         else
 349                 return -1;
 350 }
 351
 352 static u8 *uvesafb_vbe_state_save(struct uvesafb_par *par)
 353 {
 354         struct uvesafb_ktask *task;
 355         u8 *state;
 356         int err;
 357
 358         if (!par->vbe_state_size)
 359                 return NULL;
 360
 361         state = kmalloc(par->vbe_state_size, GFP_KERNEL);
 362         if (!state)
 363                 return ERR_PTR(-ENOMEM);
 364
 365         task = uvesafb_prep();
 366         if (!task) {
 367                 kfree(state);
 368                 return NULL;
 369         }
 370
 371         task->t.regs.eax = 0x4f04;
 372         task->t.regs.ecx = 0x000f;
 373         task->t.regs.edx = 0x0001;
 374         task->t.flags = TF_BUF_RET | TF_BUF_ESBX;
 375         task->t.buf_len = par->vbe_state_size;
 376         task->buf = state;
 377         err = uvesafb_exec(task);
 378
 379         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 380                 pr_warn("VBE get state call failed (eax=0x%x, err=%d)\n",
 381                         task->t.regs.eax, err);
 382                 kfree(state);
 383                 state = NULL;
 384         }
 385
 386         uvesafb_free(task);
 387         return state;
 388 }
 389
 390 static void uvesafb_vbe_state_restore(struct uvesafb_par *par, u8 *state_buf)
 391 {
 392         struct uvesafb_ktask *task;
 393         int err;
 394
 395         if (!state_buf)
 396                 return;
 397
 398         task = uvesafb_prep();
 399         if (!task)
 400                 return;
 401
 402         task->t.regs.eax = 0x4f04;
 403         task->t.regs.ecx = 0x000f;
 404         task->t.regs.edx = 0x0002;
 405         task->t.buf_len = par->vbe_state_size;
 406         task->t.flags = TF_BUF_ESBX;
 407         task->buf = state_buf;
 408
 409         err = uvesafb_exec(task);
 410         if (err || (task->t.regs.eax & 0xffff) != 0x004f)
 411                 pr_warn("VBE state restore call failed (eax=0x%x, err=%d)\n",
 412                         task->t.regs.eax, err);
 413
 414         uvesafb_free(task);
 415 }
 416
 417 static int uvesafb_vbe_getinfo(struct uvesafb_ktask *task,
 418                                struct uvesafb_par *par)
 419 {
 420         int err;
 421
 422         task->t.regs.eax = 0x4f00;
 423         task->t.flags = TF_VBEIB;
 424         task->t.buf_len = sizeof(struct vbe_ib);
 425         task->buf = &par->vbe_ib;
 426         memcpy(par->vbe_ib.vbe_signature, "VBE2", 4);
 427
 428         err = uvesafb_exec(task);
 429         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 430                 pr_err("Getting VBE info block failed (eax=0x%x, err=%d)\n",
 431                        (u32)task->t.regs.eax, err);
 432                 return -EINVAL;
 433         }
 434
 435         if (par->vbe_ib.vbe_version < 0x0200) {
 436                 pr_err("Sorry, pre-VBE 2.0 cards are not supported\n");
 437                 return -EINVAL;
 438         }
 439
 440         if (!par->vbe_ib.mode_list_ptr) {
 441                 pr_err("Missing mode list!\n");
 442                 return -EINVAL;
 443         }
 444
 445         pr_info("");
 446
 447         /*
 448          * Convert string pointers and the mode list pointer into
 449          * usable addresses. Print informational messages about the
 450          * video adapter and its vendor.
 451          */
 452         if (par->vbe_ib.oem_vendor_name_ptr)
 453                 pr_cont("%s, ",
 454                         ((char *)task->buf) + par->vbe_ib.oem_vendor_name_ptr);
 455
 456         if (par->vbe_ib.oem_product_name_ptr)
 457                 pr_cont("%s, ",
 458                         ((char *)task->buf) + par->vbe_ib.oem_product_name_ptr);
 459
 460         if (par->vbe_ib.oem_product_rev_ptr)
 461                 pr_cont("%s, ",
 462                         ((char *)task->buf) + par->vbe_ib.oem_product_rev_ptr);
 463
 464         if (par->vbe_ib.oem_string_ptr)
 465                 pr_cont("OEM: %s, ",
 466                         ((char *)task->buf) + par->vbe_ib.oem_string_ptr);
 467
 468         pr_cont("VBE v%d.%d\n",
 469                 (par->vbe_ib.vbe_version & 0xff00) >> 8,
 470                 par->vbe_ib.vbe_version & 0xff);
 471
 472         return 0;
 473 }
 474
 475 static int uvesafb_vbe_getmodes(struct uvesafb_ktask *task,
 476                                 struct uvesafb_par *par)
 477 {
 478         int off = 0, err;
 479         u16 *mode;
 480
 481         par->vbe_modes_cnt = 0;
 482
 483         /* Count available modes. */
 484         mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
 485         while (*mode != 0xffff) {
 486                 par->vbe_modes_cnt++;
 487                 mode++;
 488         }
 489
 490         par->vbe_modes = kcalloc(par->vbe_modes_cnt,
 491                                  sizeof(struct vbe_mode_ib),
 492                                  GFP_KERNEL);
 493         if (!par->vbe_modes)
 494                 return -ENOMEM;
 495
 496         /* Get info about all available modes. */
 497         mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
 498         while (*mode != 0xffff) {
 499                 struct vbe_mode_ib *mib;
 500
 501                 uvesafb_reset(task);
 502                 task->t.regs.eax = 0x4f01;
 503                 task->t.regs.ecx = (u32) *mode;
 504                 task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
 505                 task->t.buf_len = sizeof(struct vbe_mode_ib);
 506                 task->buf = par->vbe_modes + off;
 507
 508                 err = uvesafb_exec(task);
 509                 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 510                         pr_warn("Getting mode info block for mode 0x%x failed (eax=0x%x, err=%d)\n",
 511                                 *mode, (u32)task->t.regs.eax, err);
 512                         mode++;
 513                         par->vbe_modes_cnt--;
 514                         continue;
 515                 }
 516
 517                 mib = task->buf;
 518                 mib->mode_id = *mode;
 519
 520                 /*
 521                  * We only want modes that are supported with the current
 522                  * hardware configuration, color, graphics and that have
 523                  * support for the LFB.
 524                  */
 525                 if ((mib->mode_attr & VBE_MODE_MASK) == VBE_MODE_MASK &&
 526                                  mib->bits_per_pixel >= 8)
 527                         off++;
 528                 else
 529                         par->vbe_modes_cnt--;
 530
 531                 mode++;
 532                 mib->depth = mib->red_len + mib->green_len + mib->blue_len;
 533
 534                 /*
 535                  * Handle 8bpp modes and modes with broken color component
 536                  * lengths.
 537                  */
 538                 if (mib->depth == 0 || (mib->depth == 24 &&
 539                                         mib->bits_per_pixel == 32))
 540                         mib->depth = mib->bits_per_pixel;
 541         }
 542
 543         if (par->vbe_modes_cnt > 0)
 544                 return 0;
 545         else
 546                 return -EINVAL;
 547 }
 548
 549 /*
 550  * The Protected Mode Interface is 32-bit x86 code, so we only run it on
 551  * x86 and not x86_64.
 552  */
 553 #ifdef CONFIG_X86_32
 554 static int uvesafb_vbe_getpmi(struct uvesafb_ktask *task,
 555                               struct uvesafb_par *par)
 556 {
 557         int i, err;
 558
 559         uvesafb_reset(task);
 560         task->t.regs.eax = 0x4f0a;
 561         task->t.regs.ebx = 0x0;
 562         err = uvesafb_exec(task);
 563         if (err)
 564                 return err;
 565
 566         if ((task->t.regs.eax & 0xffff) != 0x4f || task->t.regs.es < 0xc000) {
 567                 par->pmi_setpal = par->ypan = 0;
 568         } else {
 569                 par->pmi_base = (u16 *)phys_to_virt(((u32)task->t.regs.es << 4)
 570                                                 + task->t.regs.edi);
 571                 par->pmi_start = (u8 *)par->pmi_base + par->pmi_base[1];
 572                 par->pmi_pal = (u8 *)par->pmi_base + par->pmi_base[2];
 573                 pr_info("protected mode interface info at %04x:%04x\n",
 574                         (u16)task->t.regs.es, (u16)task->t.regs.edi);
 575                 pr_info("pmi: set display start = %p, set palette = %p\n",
 576                         par->pmi_start, par->pmi_pal);
 577
 578                 if (par->pmi_base[3]) {
 579                         pr_info("pmi: ports =");
 580                         for (i = par->pmi_base[3]/2;
 581                                         par->pmi_base[i] != 0xffff; i++)
 582                                 pr_cont(" %x", par->pmi_base[i]);
 583                         pr_cont("\n");
 584
 585                         if (par->pmi_base[i] != 0xffff) {
 586                                 pr_info("can't handle memory requests, pmi disabled\n");
 587                                 par->ypan = par->pmi_setpal = 0;
 588                         }
 589                 }
 590         }
 591         return 0;
 592 }
 593 #endif /* CONFIG_X86_32 */
 594
 595 /*
 596  * Check whether a video mode is supported by the Video BIOS and is
 597  * compatible with the monitor limits.
 598  */
 599 static int uvesafb_is_valid_mode(struct fb_videomode *mode,
 600                                  struct fb_info *info)
 601 {
 602         if (info->monspecs.gtf) {
 603                 fb_videomode_to_var(&info->var, mode);
 604                 if (fb_validate_mode(&info->var, info))
 605                         return 0;
 606         }
 607
 608         if (uvesafb_vbe_find_mode(info->par, mode->xres, mode->yres, 8,
 609                                 UVESAFB_EXACT_RES) == -1)
 610                 return 0;
 611
 612         return 1;
 613 }
 614
 615 static int uvesafb_vbe_getedid(struct uvesafb_ktask *task, struct fb_info *info)
 616 {
 617         struct uvesafb_par *par = info->par;
 618         int err = 0;
 619
 620         if (noedid || par->vbe_ib.vbe_version < 0x0300)
 621                 return -EINVAL;
 622
 623         task->t.regs.eax = 0x4f15;
 624         task->t.regs.ebx = 0;
 625         task->t.regs.ecx = 0;
 626         task->t.buf_len = 0;
 627         task->t.flags = 0;
 628
 629         err = uvesafb_exec(task);
 630
 631         if ((task->t.regs.eax & 0xffff) != 0x004f || err)
 632                 return -EINVAL;
 633
 634         if ((task->t.regs.ebx & 0x3) == 3) {
 635                 pr_info("VBIOS/hardware supports both DDC1 and DDC2 transfers\n");
 636         } else if ((task->t.regs.ebx & 0x3) == 2) {
 637                 pr_info("VBIOS/hardware supports DDC2 transfers\n");
 638         } else if ((task->t.regs.ebx & 0x3) == 1) {
 639                 pr_info("VBIOS/hardware supports DDC1 transfers\n");
 640         } else {
 641                 pr_info("VBIOS/hardware doesn't support DDC transfers\n");
 642                 return -EINVAL;
 643         }
 644
 645         task->t.regs.eax = 0x4f15;
 646         task->t.regs.ebx = 1;
 647         task->t.regs.ecx = task->t.regs.edx = 0;
 648         task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
 649         task->t.buf_len = EDID_LENGTH;
 650         task->buf = kzalloc(EDID_LENGTH, GFP_KERNEL);
 651         if (!task->buf)
 652                 return -ENOMEM;
 653
 654         err = uvesafb_exec(task);
 655
 656         if ((task->t.regs.eax & 0xffff) == 0x004f && !err) {
 657                 fb_edid_to_monspecs(task->buf, &info->monspecs);
 658
 659                 if (info->monspecs.vfmax && info->monspecs.hfmax) {
 660                         /*
 661                          * If the maximum pixel clock wasn't specified in
 662                          * the EDID block, set it to 300 MHz.
 663                          */
 664                         if (info->monspecs.dclkmax == 0)
 665                                 info->monspecs.dclkmax = 300 * 1000000;
 666                         info->monspecs.gtf = 1;
 667                 }
 668         } else {
 669                 err = -EINVAL;
 670         }
 671
 672         kfree(task->buf);
 673         return err;
 674 }
 675
 676 static void uvesafb_vbe_getmonspecs(struct uvesafb_ktask *task,
 677                                     struct fb_info *info)
 678 {
 679         struct uvesafb_par *par = info->par;
 680         int i;
 681
 682         memset(&info->monspecs, 0, sizeof(info->monspecs));
 683
 684         /*
 685          * If we don't get all necessary data from the EDID block,
 686          * mark it as incompatible with the GTF and set nocrtc so
 687          * that we always use the default BIOS refresh rate.
 688          */
 689         if (uvesafb_vbe_getedid(task, info)) {
 690                 info->monspecs.gtf = 0;
 691                 par->nocrtc = 1;
 692         }
 693
 694         /* Kernel command line overrides. */
 695         if (maxclk)
 696                 info->monspecs.dclkmax = maxclk * 1000000;
 697         if (maxvf)
 698                 info->monspecs.vfmax = maxvf;
 699         if (maxhf)
 700                 info->monspecs.hfmax = maxhf * 1000;
 701
 702         /*
 703          * In case DDC transfers are not supported, the user can provide
 704          * monitor limits manually. Lower limits are set to "safe" values.
 705          */
 706         if (info->monspecs.gtf == 0 && maxclk && maxvf && maxhf) {
 707                 info->monspecs.dclkmin = 0;
 708                 info->monspecs.vfmin = 60;
 709                 info->monspecs.hfmin = 29000;
 710                 info->monspecs.gtf = 1;
 711                 par->nocrtc = 0;
 712         }
 713
 714         if (info->monspecs.gtf)
 715                 pr_info("monitor limits: vf = %d Hz, hf = %d kHz, clk = %d MHz\n",
 716                         info->monspecs.vfmax,
 717                         (int)(info->monspecs.hfmax / 1000),
 718                         (int)(info->monspecs.dclkmax / 1000000));
 719         else
 720                 pr_info("no monitor limits have been set, default refresh rate will be used\n");
 721
 722         /* Add VBE modes to the modelist. */
 723         for (i = 0; i < par->vbe_modes_cnt; i++) {
 724                 struct fb_var_screeninfo var;
 725                 struct vbe_mode_ib *mode;
 726                 struct fb_videomode vmode;
 727
 728                 mode = &par->vbe_modes[i];
 729                 memset(&var, 0, sizeof(var));
 730
 731                 var.xres = mode->x_res;
 732                 var.yres = mode->y_res;
 733
 734                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, &var, info);
 735                 fb_var_to_videomode(&vmode, &var);
 736                 fb_add_videomode(&vmode, &info->modelist);
 737         }
 738
 739         /* Add valid VESA modes to our modelist. */
 740         for (i = 0; i < VESA_MODEDB_SIZE; i++) {
 741                 if (uvesafb_is_valid_mode((struct fb_videomode *)
 742                                                 &vesa_modes[i], info))
 743                         fb_add_videomode(&vesa_modes[i], &info->modelist);
 744         }
 745
 746         for (i = 0; i < info->monspecs.modedb_len; i++) {
 747                 if (uvesafb_is_valid_mode(&info->monspecs.modedb[i], info))
 748                         fb_add_videomode(&info->monspecs.modedb[i],
 749                                         &info->modelist);
 750         }
 751
 752         return;
 753 }
 754
 755 static void uvesafb_vbe_getstatesize(struct uvesafb_ktask *task,
 756                                      struct uvesafb_par *par)
 757 {
 758         int err;
 759
 760         uvesafb_reset(task);
 761
 762         /*
 763          * Get the VBE state buffer size. We want all available
 764          * hardware state data (CL = 0x0f).
 765          */
 766         task->t.regs.eax = 0x4f04;
 767         task->t.regs.ecx = 0x000f;
 768         task->t.regs.edx = 0x0000;
 769         task->t.flags = 0;
 770
 771         err = uvesafb_exec(task);
 772
 773         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 774                 pr_warn("VBE state buffer size cannot be determined (eax=0x%x, err=%d)\n",
 775                         task->t.regs.eax, err);
 776                 par->vbe_state_size = 0;
 777                 return;
 778         }
 779
 780         par->vbe_state_size = 64 * (task->t.regs.ebx & 0xffff);
 781 }
 782
 783 static int uvesafb_vbe_init(struct fb_info *info)
 784 {
 785         struct uvesafb_ktask *task = NULL;
 786         struct uvesafb_par *par = info->par;
 787         int err;
 788
 789         task = uvesafb_prep();
 790         if (!task)
 791                 return -ENOMEM;
 792
 793         err = uvesafb_vbe_getinfo(task, par);
 794         if (err)
 795                 goto out;
 796
 797         err = uvesafb_vbe_getmodes(task, par);
 798         if (err)
 799                 goto out;
 800
 801         par->nocrtc = nocrtc;
 802 #ifdef CONFIG_X86_32
 803         par->pmi_setpal = pmi_setpal;
 804         par->ypan = ypan;
 805
 806         if (par->pmi_setpal || par->ypan) {
 807                 if (__supported_pte_mask & _PAGE_NX) {
 808                         par->pmi_setpal = par->ypan = 0;
 809                         pr_warn("NX protection is active, better not use the PMI\n");
 810                 } else {
 811                         uvesafb_vbe_getpmi(task, par);
 812                 }
 813         }
 814 #else
 815         /* The protected mode interface is not available on non-x86. */
 816         par->pmi_setpal = par->ypan = 0;
 817 #endif
 818
 819         INIT_LIST_HEAD(&info->modelist);
 820         uvesafb_vbe_getmonspecs(task, info);
 821         uvesafb_vbe_getstatesize(task, par);
 822
 823 out:    uvesafb_free(task);
 824         return err;
 825 }
 826
 827 static int uvesafb_vbe_init_mode(struct fb_info *info)
 828 {
 829         struct list_head *pos;
 830         struct fb_modelist *modelist;
 831         struct fb_videomode *mode;
 832         struct uvesafb_par *par = info->par;
 833         int i, modeid;
 834
 835         /* Has the user requested a specific VESA mode? */
 836         if (vbemode) {
 837                 for (i = 0; i < par->vbe_modes_cnt; i++) {
 838                         if (par->vbe_modes[i].mode_id == vbemode) {
 839                                 modeid = i;
 840                                 uvesafb_setup_var(&info->var, info,
 841                                                 &par->vbe_modes[modeid]);
 842                                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 843                                                 &info->var, info);
 844                                 /*
 845                                  * With pixclock set to 0, the default BIOS
 846                                  * timings will be used in set_par().
 847                                  */
 848                                 info->var.pixclock = 0;
 849                                 goto gotmode;
 850                         }
 851                 }
 852                 pr_info("requested VBE mode 0x%x is unavailable\n", vbemode);
 853                 vbemode = 0;
 854         }
 855
 856         /* Count the modes in the modelist */
 857         i = 0;
 858         list_for_each(pos, &info->modelist)
 859                 i++;
 860
 861         /*
 862          * Convert the modelist into a modedb so that we can use it with
 863          * fb_find_mode().
 864          */
 865         mode = kcalloc(i, sizeof(*mode), GFP_KERNEL);
 866         if (mode) {
 867                 i = 0;
 868                 list_for_each(pos, &info->modelist) {
 869                         modelist = list_entry(pos, struct fb_modelist, list);
 870                         mode[i] = modelist->mode;
 871                         i++;
 872                 }
 873
 874                 if (!mode_option)
 875                         mode_option = UVESAFB_DEFAULT_MODE;
 876
 877                 i = fb_find_mode(&info->var, info, mode_option, mode, i,
 878                         NULL, 8);
 879
 880                 kfree(mode);
 881         }
 882
 883         /* fb_find_mode() failed */
 884         if (i == 0) {
 885                 info->var.xres = 640;
 886                 info->var.yres = 480;
 887                 mode = (struct fb_videomode *)
 888                                 fb_find_best_mode(&info->var, &info->modelist);
 889
 890                 if (mode) {
 891                         fb_videomode_to_var(&info->var, mode);
 892                 } else {
 893                         modeid = par->vbe_modes[0].mode_id;
 894                         uvesafb_setup_var(&info->var, info,
 895                                         &par->vbe_modes[modeid]);
 896                         fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 897                                         &info->var, info);
 898
 899                         goto gotmode;
 900                 }
 901         }
 902
 903         /* Look for a matching VBE mode. */
 904         modeid = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres,
 905                         info->var.bits_per_pixel, UVESAFB_EXACT_RES);
 906
 907         if (modeid == -1)
 908                 return -EINVAL;
 909
 910         uvesafb_setup_var(&info->var, info, &par->vbe_modes[modeid]);
 911
 912 gotmode:
 913         /*
 914          * If we are not VBE3.0+ compliant, we're done -- the BIOS will
 915          * ignore our timings anyway.
 916          */
 917         if (par->vbe_ib.vbe_version < 0x0300 || par->nocrtc)
 918                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 919                                         &info->var, info);
 920
 921         return modeid;
 922 }
 923
 924 static int uvesafb_setpalette(struct uvesafb_pal_entry *entries, int count,
 925                 int start, struct fb_info *info)
 926 {
 927         struct uvesafb_ktask *task;
 928 #ifdef CONFIG_X86
 929         struct uvesafb_par *par = info->par;
 930         int i = par->mode_idx;
 931 #endif
 932         int err = 0;
 933
 934         /*
 935          * We support palette modifications for 8 bpp modes only, so
 936          * there can never be more than 256 entries.
 937          */
 938         if (start + count > 256)
 939                 return -EINVAL;
 940
 941 #ifdef CONFIG_X86
 942         /* Use VGA registers if mode is VGA-compatible. */
 943         if (i >= 0 && i < par->vbe_modes_cnt &&
 944             par->vbe_modes[i].mode_attr & VBE_MODE_VGACOMPAT) {
 945                 for (i = 0; i < count; i++) {
 946                         outb_p(start + i,        dac_reg);
 947                         outb_p(entries[i].red,   dac_val);
 948                         outb_p(entries[i].green, dac_val);
 949                         outb_p(entries[i].blue,  dac_val);
 950                 }
 951         }
 952 #ifdef CONFIG_X86_32
 953         else if (par->pmi_setpal) {
 954                 __asm__ __volatile__(
 955                 "call *(%%esi)"
 956                 : /* no return value */
 957                 : "a" (0x4f09),         /* EAX */
 958                   "b" (0),              /* EBX */
 959                   "c" (count),          /* ECX */
 960                   "d" (start),          /* EDX */
 961                   "D" (entries),        /* EDI */
 962                   "S" (&par->pmi_pal)); /* ESI */
 963         }
 964 #endif /* CONFIG_X86_32 */
 965         else
 966 #endif /* CONFIG_X86 */
 967         {
 968                 task = uvesafb_prep();
 969                 if (!task)
 970                         return -ENOMEM;
 971
 972                 task->t.regs.eax = 0x4f09;
 973                 task->t.regs.ebx = 0x0;
 974                 task->t.regs.ecx = count;
 975                 task->t.regs.edx = start;
 976                 task->t.flags = TF_BUF_ESDI;
 977                 task->t.buf_len = sizeof(struct uvesafb_pal_entry) * count;
 978                 task->buf = entries;
 979
 980                 err = uvesafb_exec(task);
 981                 if ((task->t.regs.eax & 0xffff) != 0x004f)
 982                         err = 1;
 983
 984                 uvesafb_free(task);
 985         }
 986         return err;
 987 }
 988
 989 static int uvesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
 990                 unsigned blue, unsigned transp,
 991                 struct fb_info *info)
 992 {
 993         struct uvesafb_pal_entry entry;
 994         int shift = 16 - dac_width;
 995         int err = 0;
 996
 997         if (regno >= info->cmap.len)
 998                 return -EINVAL;
 999
1000         if (info->var.bits_per_pixel == 8) {
1001                 entry.red   = red   >> shift;
1002                 entry.green = green >> shift;
1003                 entry.blue  = blue  >> shift;
1004                 entry.pad   = 0;
1005
1006                 err = uvesafb_setpalette(&entry, 1, regno, info);
1007         } else if (regno < 16) {
1008                 switch (info->var.bits_per_pixel) {
1009                 case 16:
1010                         if (info->var.red.offset == 10) {
1011                                 /* 1:5:5:5 */
1012                                 ((u32 *) (info->pseudo_palette))[regno] =
1013                                                 ((red   & 0xf800) >>  1) |
1014                                                 ((green & 0xf800) >>  6) |
1015                                                 ((blue  & 0xf800) >> 11);
1016                         } else {
1017                                 /* 0:5:6:5 */
1018                                 ((u32 *) (info->pseudo_palette))[regno] =
1019                                                 ((red   & 0xf800)      ) |
1020                                                 ((green & 0xfc00) >>  5) |
1021                                                 ((blue  & 0xf800) >> 11);
1022                         }
1023                         break;
1024
1025                 case 24:
1026                 case 32:
1027                         red   >>= 8;
1028                         green >>= 8;
1029                         blue  >>= 8;
1030                         ((u32 *)(info->pseudo_palette))[regno] =
1031                                 (red   << info->var.red.offset)   |
1032                                 (green << info->var.green.offset) |
1033                                 (blue  << info->var.blue.offset);
1034                         break;
1035                 }
1036         }
1037         return err;
1038 }
1039
1040 static int uvesafb_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1041 {
1042         struct uvesafb_pal_entry *entries;
1043         int shift = 16 - dac_width;
1044         int i, err = 0;
1045
1046         if (info->var.bits_per_pixel == 8) {
1047                 if (cmap->start + cmap->len > info->cmap.start +
1048                     info->cmap.len || cmap->start < info->cmap.start)
1049                         return -EINVAL;
1050
1051                 entries = kmalloc_array(cmap->len, sizeof(*entries),
1052                                         GFP_KERNEL);
1053                 if (!entries)
1054                         return -ENOMEM;
1055
1056                 for (i = 0; i < cmap->len; i++) {
1057                         entries[i].red   = cmap->red[i]   >> shift;
1058                         entries[i].green = cmap->green[i] >> shift;
1059                         entries[i].blue  = cmap->blue[i]  >> shift;
1060                         entries[i].pad   = 0;
1061                 }
1062                 err = uvesafb_setpalette(entries, cmap->len, cmap->start, info);
1063                 kfree(entries);
1064         } else {
1065                 /*
1066                  * For modes with bpp > 8, we only set the pseudo palette in
1067                  * the fb_info struct. We rely on uvesafb_setcolreg to do all
1068                  * sanity checking.
1069                  */
1070                 for (i = 0; i < cmap->len; i++) {
1071                         err |= uvesafb_setcolreg(cmap->start + i, cmap->red[i],
1072                                                 cmap->green[i], cmap->blue[i],
1073                                                 0, info);
1074                 }
1075         }
1076         return err;
1077 }
1078
1079 static int uvesafb_pan_display(struct fb_var_screeninfo *var,
1080                 struct fb_info *info)
1081 {
1082 #ifdef CONFIG_X86_32
1083         int offset;
1084         struct uvesafb_par *par = info->par;
1085
1086         offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
1087
1088         /*
1089          * It turns out it's not the best idea to do panning via vm86,
1090          * so we only allow it if we have a PMI.
1091          */
1092         if (par->pmi_start) {
1093                 __asm__ __volatile__(
1094                         "call *(%%edi)"
1095                         : /* no return value */
1096                         : "a" (0x4f07),         /* EAX */
1097                           "b" (0),              /* EBX */
1098                           "c" (offset),         /* ECX */
1099                           "d" (offset >> 16),   /* EDX */
1100                           "D" (&par->pmi_start));    /* EDI */
1101         }
1102 #endif
1103         return 0;
1104 }
1105
1106 static int uvesafb_blank(int blank, struct fb_info *info)
1107 {
1108         struct uvesafb_ktask *task;
1109         int err = 1;
1110 #ifdef CONFIG_X86
1111         struct uvesafb_par *par = info->par;
1112
1113         if (par->vbe_ib.capabilities & VBE_CAP_VGACOMPAT) {
1114                 int loop = 10000;
1115                 u8 seq = 0, crtc17 = 0;
1116
1117                 if (blank == FB_BLANK_POWERDOWN) {
1118                         seq = 0x20;
1119                         crtc17 = 0x00;
1120                         err = 0;
1121                 } else {
1122                         seq = 0x00;
1123                         crtc17 = 0x80;
1124                         err = (blank == FB_BLANK_UNBLANK) ? 0 : -EINVAL;
1125                 }
1126
1127                 vga_wseq(NULL, 0x00, 0x01);
1128                 seq |= vga_rseq(NULL, 0x01) & ~0x20;
1129                 vga_wseq(NULL, 0x00, seq);
1130
1131                 crtc17 |= vga_rcrt(NULL, 0x17) & ~0x80;
1132                 while (loop--);
1133                 vga_wcrt(NULL, 0x17, crtc17);
1134                 vga_wseq(NULL, 0x00, 0x03);
1135         } else
1136 #endif /* CONFIG_X86 */
1137         {
1138                 task = uvesafb_prep();
1139                 if (!task)
1140                         return -ENOMEM;
1141
1142                 task->t.regs.eax = 0x4f10;
1143                 switch (blank) {
1144                 case FB_BLANK_UNBLANK:
1145                         task->t.regs.ebx = 0x0001;
1146                         break;
1147                 case FB_BLANK_NORMAL:
1148                         task->t.regs.ebx = 0x0101;      /* standby */
1149                         break;
1150                 case FB_BLANK_POWERDOWN:
1151                         task->t.regs.ebx = 0x0401;      /* powerdown */
1152                         break;
1153                 default:
1154                         goto out;
1155                 }
1156
1157                 err = uvesafb_exec(task);
1158                 if (err || (task->t.regs.eax & 0xffff) != 0x004f)
1159                         err = 1;
1160 out:            uvesafb_free(task);
1161         }
1162         return err;
1163 }
1164
1165 static int uvesafb_open(struct fb_info *info, int user)
1166 {
1167         struct uvesafb_par *par = info->par;
1168         int cnt = atomic_read(&par->ref_count);
1169         u8 *buf = NULL;
1170
1171         if (!cnt && par->vbe_state_size) {
1172                 buf =  uvesafb_vbe_state_save(par);
1173                 if (IS_ERR(buf)) {
1174                         pr_warn("save hardware state failed, error code is %ld!\n",
1175                                 PTR_ERR(buf));
1176                 } else {
1177                         par->vbe_state_orig = buf;
1178                 }
1179         }
1180
1181         atomic_inc(&par->ref_count);
1182         return 0;
1183 }
1184
1185 static int uvesafb_release(struct fb_info *info, int user)
1186 {
1187         struct uvesafb_ktask *task = NULL;
1188         struct uvesafb_par *par = info->par;
1189         int cnt = atomic_read(&par->ref_count);
1190
1191         if (!cnt)
1192                 return -EINVAL;
1193
1194         if (cnt != 1)
1195                 goto out;
1196
1197         task = uvesafb_prep();
1198         if (!task)
1199                 goto out;
1200
1201         /* First, try to set the standard 80x25 text mode. */
1202         task->t.regs.eax = 0x0003;
1203         uvesafb_exec(task);
1204
1205         /*
1206          * Now try to restore whatever hardware state we might have
1207          * saved when the fb device was first opened.
1208          */
1209         uvesafb_vbe_state_restore(par, par->vbe_state_orig);
1210 out:
1211         atomic_dec(&par->ref_count);
1212         uvesafb_free(task);
1213         return 0;
1214 }
1215
1216 static int uvesafb_set_par(struct fb_info *info)
1217 {
1218         struct uvesafb_par *par = info->par;
1219         struct uvesafb_ktask *task = NULL;
1220         struct vbe_crtc_ib *crtc = NULL;
1221         struct vbe_mode_ib *mode = NULL;
1222         int i, err = 0, depth = info->var.bits_per_pixel;
1223
1224         if (depth > 8 && depth != 32)
1225                 depth = info->var.red.length + info->var.green.length +
1226                         info->var.blue.length;
1227
1228         i = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres, depth,
1229                                  UVESAFB_EXACT_RES | UVESAFB_EXACT_DEPTH);
1230         if (i >= 0)
1231                 mode = &par->vbe_modes[i];
1232         else
1233                 return -EINVAL;
1234
1235         task = uvesafb_prep();
1236         if (!task)
1237                 return -ENOMEM;
1238 setmode:
1239         task->t.regs.eax = 0x4f02;
1240         task->t.regs.ebx = mode->mode_id | 0x4000;      /* use LFB */
1241
1242         if (par->vbe_ib.vbe_version >= 0x0300 && !par->nocrtc &&
1243             info->var.pixclock != 0) {
1244                 task->t.regs.ebx |= 0x0800;             /* use CRTC data */
1245                 task->t.flags = TF_BUF_ESDI;
1246                 crtc = kzalloc(sizeof(struct vbe_crtc_ib), GFP_KERNEL);
1247                 if (!crtc) {
1248                         err = -ENOMEM;
1249                         goto out;
1250                 }
1251                 crtc->horiz_start = info->var.xres + info->var.right_margin;
1252                 crtc->horiz_end   = crtc->horiz_start + info->var.hsync_len;
1253                 crtc->horiz_total = crtc->horiz_end + info->var.left_margin;
1254
1255                 crtc->vert_start  = info->var.yres + info->var.lower_margin;
1256                 crtc->vert_end    = crtc->vert_start + info->var.vsync_len;
1257                 crtc->vert_total  = crtc->vert_end + info->var.upper_margin;
1258
1259                 crtc->pixel_clock = PICOS2KHZ(info->var.pixclock) * 1000;
1260                 crtc->refresh_rate = (u16)(100 * (crtc->pixel_clock /
1261                                 (crtc->vert_total * crtc->horiz_total)));
1262
1263                 if (info->var.vmode & FB_VMODE_DOUBLE)
1264                         crtc->flags |= 0x1;
1265                 if (info->var.vmode & FB_VMODE_INTERLACED)
1266                         crtc->flags |= 0x2;
1267                 if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
1268                         crtc->flags |= 0x4;
1269                 if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
1270                         crtc->flags |= 0x8;
1271                 memcpy(&par->crtc, crtc, sizeof(*crtc));
1272         } else {
1273                 memset(&par->crtc, 0, sizeof(*crtc));
1274         }
1275
1276         task->t.buf_len = sizeof(struct vbe_crtc_ib);
1277         task->buf = &par->crtc;
1278
1279         err = uvesafb_exec(task);
1280         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
1281                 /*
1282                  * The mode switch might have failed because we tried to
1283                  * use our own timings.  Try again with the default timings.
1284                  */
1285                 if (crtc != NULL) {
1286                         pr_warn("mode switch failed (eax=0x%x, err=%d) - trying again with default timings\n",
1287                                 task->t.regs.eax, err);
1288                         uvesafb_reset(task);
1289                         kfree(crtc);
1290                         crtc = NULL;
1291                         info->var.pixclock = 0;
1292                         goto setmode;
1293                 } else {
1294                         pr_err("mode switch failed (eax=0x%x, err=%d)\n",
1295                                task->t.regs.eax, err);
1296                         err = -EINVAL;
1297                         goto out;
1298                 }
1299         }
1300         par->mode_idx = i;
1301
1302         /* For 8bpp modes, always try to set the DAC to 8 bits. */
1303         if (par->vbe_ib.capabilities & VBE_CAP_CAN_SWITCH_DAC &&
1304             mode->bits_per_pixel <= 8) {
1305                 uvesafb_reset(task);
1306                 task->t.regs.eax = 0x4f08;
1307                 task->t.regs.ebx = 0x0800;
1308
1309                 err = uvesafb_exec(task);
1310                 if (err || (task->t.regs.eax & 0xffff) != 0x004f ||
1311                     ((task->t.regs.ebx & 0xff00) >> 8) != 8) {
1312                         dac_width = 6;
1313                 } else {
1314                         dac_width = 8;
1315                 }
1316         }
1317
1318         info->fix.visual = (info->var.bits_per_pixel == 8) ?
1319                                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
1320         info->fix.line_length = mode->bytes_per_scan_line;
1321
1322 out:
1323         kfree(crtc);
1324         uvesafb_free(task);
1325
1326         return err;
1327 }
1328
1329 static void uvesafb_check_limits(struct fb_var_screeninfo *var,
1330                 struct fb_info *info)
1331 {
1332         const struct fb_videomode *mode;
1333         struct uvesafb_par *par = info->par;
1334
1335         /*
1336          * If pixclock is set to 0, then we're using default BIOS timings
1337          * and thus don't have to perform any checks here.
1338          */
1339         if (!var->pixclock)
1340                 return;
1341
1342         if (par->vbe_ib.vbe_version < 0x0300) {
1343                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, var, info);
1344                 return;
1345         }
1346
1347         if (!fb_validate_mode(var, info))
1348                 return;
1349
1350         mode = fb_find_best_mode(var, &info->modelist);
1351         if (mode) {
1352                 if (mode->xres == var->xres && mode->yres == var->yres &&
1353                     !(mode->vmode & (FB_VMODE_INTERLACED | FB_VMODE_DOUBLE))) {
1354                         fb_videomode_to_var(var, mode);
1355                         return;
1356                 }
1357         }
1358
1359         if (info->monspecs.gtf && !fb_get_mode(FB_MAXTIMINGS, 0, var, info))
1360                 return;
1361         /* Use default refresh rate */
1362         var->pixclock = 0;
1363 }
1364
1365 static int uvesafb_check_var(struct fb_var_screeninfo *var,
1366                 struct fb_info *info)
1367 {
1368         struct uvesafb_par *par = info->par;
1369         struct vbe_mode_ib *mode = NULL;
1370         int match = -1;
1371         int depth = var->red.length + var->green.length + var->blue.length;
1372
1373         /*
1374          * Various apps will use bits_per_pixel to set the color depth,
1375          * which is theoretically incorrect, but which we'll try to handle
1376          * here.
1377          */
1378         if (depth == 0 || abs(depth - var->bits_per_pixel) >= 8)
1379                 depth = var->bits_per_pixel;
1380
1381         match = uvesafb_vbe_find_mode(par, var->xres, var->yres, depth,
1382                                                 UVESAFB_EXACT_RES);
1383         if (match == -1)
1384                 return -EINVAL;
1385
1386         mode = &par->vbe_modes[match];
1387         uvesafb_setup_var(var, info, mode);
1388
1389         /*
1390          * Check whether we have remapped enough memory for this mode.
1391          * We might be called at an early stage, when we haven't remapped
1392          * any memory yet, in which case we simply skip the check.
1393          */
1394         if (var->yres * mode->bytes_per_scan_line > info->fix.smem_len
1395                                                 && info->fix.smem_len)
1396                 return -EINVAL;
1397
1398         if ((var->vmode & FB_VMODE_DOUBLE) &&
1399                                 !(par->vbe_modes[match].mode_attr & 0x100))
1400                 var->vmode &= ~FB_VMODE_DOUBLE;
1401
1402         if ((var->vmode & FB_VMODE_INTERLACED) &&
1403                                 !(par->vbe_modes[match].mode_attr & 0x200))
1404                 var->vmode &= ~FB_VMODE_INTERLACED;
1405
1406         uvesafb_check_limits(var, info);
1407
1408         var->xres_virtual = var->xres;
1409         var->yres_virtual = (par->ypan) ?
1410                                 info->fix.smem_len / mode->bytes_per_scan_line :
1411                                 var->yres;
1412         return 0;
1413 }
1414
1415 static struct fb_ops uvesafb_ops = {
1416         .owner          = THIS_MODULE,
1417         .fb_open        = uvesafb_open,
1418         .fb_release     = uvesafb_release,
1419         .fb_setcolreg   = uvesafb_setcolreg,
1420         .fb_setcmap     = uvesafb_setcmap,
1421         .fb_pan_display = uvesafb_pan_display,
1422         .fb_blank       = uvesafb_blank,
1423         .fb_fillrect    = cfb_fillrect,
1424         .fb_copyarea    = cfb_copyarea,
1425         .fb_imageblit   = cfb_imageblit,
1426         .fb_check_var   = uvesafb_check_var,
1427         .fb_set_par     = uvesafb_set_par,
1428 };
1429
1430 static void uvesafb_init_info(struct fb_info *info, struct vbe_mode_ib *mode)
1431 {
1432         unsigned int size_vmode;
1433         unsigned int size_remap;
1434         unsigned int size_total;
1435         struct uvesafb_par *par = info->par;
1436         int i, h;
1437
1438         info->pseudo_palette = ((u8 *)info->par + sizeof(struct uvesafb_par));
1439         info->fix = uvesafb_fix;
1440         info->fix.ypanstep = par->ypan ? 1 : 0;
1441         info->fix.ywrapstep = (par->ypan > 1) ? 1 : 0;
1442
1443         /* Disable blanking if the user requested so. */
1444         if (!blank)
1445                 uvesafb_ops.fb_blank = NULL;
1446
1447         /*
1448          * Find out how much IO memory is required for the mode with
1449          * the highest resolution.
1450          */
1451         size_remap = 0;
1452         for (i = 0; i < par->vbe_modes_cnt; i++) {
1453                 h = par->vbe_modes[i].bytes_per_scan_line *
1454                                         par->vbe_modes[i].y_res;
1455                 if (h > size_remap)
1456                         size_remap = h;
1457         }
1458         size_remap *= 2;
1459
1460         /*
1461          *   size_vmode -- that is the amount of memory needed for the
1462          *                 used video mode, i.e. the minimum amount of
1463          *                 memory we need.
1464          */
1465         size_vmode = info->var.yres * mode->bytes_per_scan_line;
1466
1467         /*
1468          *   size_total -- all video memory we have. Used for mtrr
1469          *                 entries, resource allocation and bounds
1470          *                 checking.
1471          */
1472         size_total = par->vbe_ib.total_memory * 65536;
1473         if (vram_total)
1474                 size_total = vram_total * 1024 * 1024;
1475         if (size_total < size_vmode)
1476                 size_total = size_vmode;
1477
1478         /*
1479          *   size_remap -- the amount of video memory we are going to
1480          *                 use for vesafb.  With modern cards it is no
1481          *                 option to simply use size_total as th
1482          *                 wastes plenty of kernel address space.
1483          */
1484         if (vram_remap)
1485                 size_remap = vram_remap * 1024 * 1024;
1486         if (size_remap < size_vmode)
1487                 size_remap = size_vmode;
1488         if (size_remap > size_total)
1489                 size_remap = size_total;
1490
1491         info->fix.smem_len = size_remap;
1492         info->fix.smem_start = mode->phys_base_ptr;
1493
1494         /*
1495          * We have to set yres_virtual here because when setup_var() was
1496          * called, smem_len wasn't defined yet.
1497          */
1498         info->var.yres_virtual = info->fix.smem_len /
1499                                  mode->bytes_per_scan_line;
1500
1501         if (par->ypan && info->var.yres_virtual > info->var.yres) {
1502                 pr_info("scrolling: %s using protected mode interface, yres_virtual=%d\n",
1503                         (par->ypan > 1) ? "ywrap" : "ypan",
1504                         info->var.yres_virtual);
1505         } else {
1506                 pr_info("scrolling: redraw\n");
1507                 info->var.yres_virtual = info->var.yres;
1508                 par->ypan = 0;
1509         }
1510
1511         info->flags = FBINFO_FLAG_DEFAULT |
1512                         (par->ypan ? FBINFO_HWACCEL_YPAN : 0);
1513
1514         if (!par->ypan)
1515                 uvesafb_ops.fb_pan_display = NULL;
1516 }
1517
1518 static void uvesafb_init_mtrr(struct fb_info *info)
1519 {
1520         struct uvesafb_par *par = info->par;
1521
1522         if (mtrr && !(info->fix.smem_start & (PAGE_SIZE - 1))) {
1523                 int temp_size = info->fix.smem_len;
1524
1525                 int rc;
1526
1527                 /* Find the largest power-of-two */
1528                 temp_size = roundup_pow_of_two(temp_size);
1529
1530                 /* Try and find a power of two to add */
1531                 do {
1532                         rc = arch_phys_wc_add(info->fix.smem_start, temp_size);
1533                         temp_size >>= 1;
1534                 } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
1535
1536                 if (rc >= 0)
1537                         par->mtrr_handle = rc;
1538         }
1539 }
1540
1541 static void uvesafb_ioremap(struct fb_info *info)
1542 {
1543         info->screen_base = ioremap_wc(info->fix.smem_start, info->fix.smem_len);
1544 }
1545
1546 static ssize_t uvesafb_show_vbe_ver(struct device *dev,
1547                 struct device_attribute *attr, char *buf)
1548 {
1549         struct fb_info *info = dev_get_drvdata(dev);
1550         struct uvesafb_par *par = info->par;
1551
1552         return snprintf(buf, PAGE_SIZE, "%.4x\n", par->vbe_ib.vbe_version);
1553 }
1554
1555 static DEVICE_ATTR(vbe_version, S_IRUGO, uvesafb_show_vbe_ver, NULL);
1556
1557 static ssize_t uvesafb_show_vbe_modes(struct device *dev,
1558                 struct device_attribute *attr, char *buf)
1559 {
1560         struct fb_info *info = dev_get_drvdata(dev);
1561         struct uvesafb_par *par = info->par;
1562         int ret = 0, i;
1563
1564         for (i = 0; i < par->vbe_modes_cnt && ret < PAGE_SIZE; i++) {
1565                 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
1566                         "%dx%d-%d, 0x%.4x\n",
1567                         par->vbe_modes[i].x_res, par->vbe_modes[i].y_res,
1568                         par->vbe_modes[i].depth, par->vbe_modes[i].mode_id);
1569         }
1570
1571         return ret;
1572 }
1573
1574 static DEVICE_ATTR(vbe_modes, S_IRUGO, uvesafb_show_vbe_modes, NULL);
1575
1576 static ssize_t uvesafb_show_vendor(struct device *dev,
1577                 struct device_attribute *attr, char *buf)
1578 {
1579         struct fb_info *info = dev_get_drvdata(dev);
1580         struct uvesafb_par *par = info->par;
1581
1582         if (par->vbe_ib.oem_vendor_name_ptr)
1583                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1584                         (&par->vbe_ib) + par->vbe_ib.oem_vendor_name_ptr);
1585         else
1586                 return 0;
1587 }
1588
1589 static DEVICE_ATTR(oem_vendor, S_IRUGO, uvesafb_show_vendor, NULL);
1590
1591 static ssize_t uvesafb_show_product_name(struct device *dev,
1592                 struct device_attribute *attr, char *buf)
1593 {
1594         struct fb_info *info = dev_get_drvdata(dev);
1595         struct uvesafb_par *par = info->par;
1596
1597         if (par->vbe_ib.oem_product_name_ptr)
1598                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1599                         (&par->vbe_ib) + par->vbe_ib.oem_product_name_ptr);
1600         else
1601                 return 0;
1602 }
1603
1604 static DEVICE_ATTR(oem_product_name, S_IRUGO, uvesafb_show_product_name, NULL);
1605
1606 static ssize_t uvesafb_show_product_rev(struct device *dev,
1607                 struct device_attribute *attr, char *buf)
1608 {
1609         struct fb_info *info = dev_get_drvdata(dev);
1610         struct uvesafb_par *par = info->par;
1611
1612         if (par->vbe_ib.oem_product_rev_ptr)
1613                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1614                         (&par->vbe_ib) + par->vbe_ib.oem_product_rev_ptr);
1615         else
1616                 return 0;
1617 }
1618
1619 static DEVICE_ATTR(oem_product_rev, S_IRUGO, uvesafb_show_product_rev, NULL);
1620
1621 static ssize_t uvesafb_show_oem_string(struct device *dev,
1622                 struct device_attribute *attr, char *buf)
1623 {
1624         struct fb_info *info = dev_get_drvdata(dev);
1625         struct uvesafb_par *par = info->par;
1626
1627         if (par->vbe_ib.oem_string_ptr)
1628                 return snprintf(buf, PAGE_SIZE, "%s\n",
1629                         (char *)(&par->vbe_ib) + par->vbe_ib.oem_string_ptr);
1630         else
1631                 return 0;
1632 }
1633
1634 static DEVICE_ATTR(oem_string, S_IRUGO, uvesafb_show_oem_string, NULL);
1635
1636 static ssize_t uvesafb_show_nocrtc(struct device *dev,
1637                 struct device_attribute *attr, char *buf)
1638 {
1639         struct fb_info *info = dev_get_drvdata(dev);
1640         struct uvesafb_par *par = info->par;
1641
1642         return snprintf(buf, PAGE_SIZE, "%d\n", par->nocrtc);
1643 }
1644
1645 static ssize_t uvesafb_store_nocrtc(struct device *dev,
1646                 struct device_attribute *attr, const char *buf, size_t count)
1647 {
1648         struct fb_info *info = dev_get_drvdata(dev);
1649         struct uvesafb_par *par = info->par;
1650
1651         if (count > 0) {
1652                 if (buf[0] == '0')
1653                         par->nocrtc = 0;
1654                 else
1655                         par->nocrtc = 1;
1656         }
1657         return count;
1658 }
1659
1660 static DEVICE_ATTR(nocrtc, S_IRUGO | S_IWUSR, uvesafb_show_nocrtc,
1661                         uvesafb_store_nocrtc);
1662
1663 static struct attribute *uvesafb_dev_attrs[] = {
1664         &dev_attr_vbe_version.attr,
1665         &dev_attr_vbe_modes.attr,
1666         &dev_attr_oem_vendor.attr,
1667         &dev_attr_oem_product_name.attr,
1668         &dev_attr_oem_product_rev.attr,
1669         &dev_attr_oem_string.attr,
1670         &dev_attr_nocrtc.attr,
1671         NULL,
1672 };
1673
1674 static const struct attribute_group uvesafb_dev_attgrp = {
1675         .name = NULL,
1676         .attrs = uvesafb_dev_attrs,
1677 };
1678
1679 static int uvesafb_probe(struct platform_device *dev)
1680 {
1681         struct fb_info *info;
1682         struct vbe_mode_ib *mode = NULL;
1683         struct uvesafb_par *par;
1684         int err = 0, i;
1685
1686         info = framebuffer_alloc(sizeof(*par) + sizeof(u32) * 256, &dev->dev);
1687         if (!info)
1688                 return -ENOMEM;
1689
1690         par = info->par;
1691
1692         err = uvesafb_vbe_init(info);
1693         if (err) {
1694                 pr_err("vbe_init() failed with %d\n", err);
1695                 goto out;
1696         }
1697
1698         info->fbops = &uvesafb_ops;
1699
1700         i = uvesafb_vbe_init_mode(info);
1701         if (i < 0) {
1702                 err = -EINVAL;
1703                 goto out;
1704         } else {
1705                 mode = &par->vbe_modes[i];
1706         }
1707
1708         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
1709                 err = -ENXIO;
1710                 goto out;
1711         }
1712
1713         uvesafb_init_info(info, mode);
1714
1715         if (!request_region(0x3c0, 32, "uvesafb")) {
1716                 pr_err("request region 0x3c0-0x3e0 failed\n");
1717                 err = -EIO;
1718                 goto out_mode;
1719         }
1720
1721         if (!request_mem_region(info->fix.smem_start, info->fix.smem_len,
1722                                 "uvesafb")) {
1723                 pr_err("cannot reserve video memory at 0x%lx\n",
1724                        info->fix.smem_start);
1725                 err = -EIO;
1726                 goto out_reg;
1727         }
1728
1729         uvesafb_init_mtrr(info);
1730         uvesafb_ioremap(info);
1731
1732         if (!info->screen_base) {
1733                 pr_err("abort, cannot ioremap 0x%x bytes of video memory at 0x%lx\n",
1734                        info->fix.smem_len, info->fix.smem_start);
1735                 err = -EIO;
1736                 goto out_mem;
1737         }
1738
1739         platform_set_drvdata(dev, info);
1740
1741         if (register_framebuffer(info) < 0) {
1742                 pr_err("failed to register framebuffer device\n");
1743                 err = -EINVAL;
1744                 goto out_unmap;
1745         }
1746
1747         pr_info("framebuffer at 0x%lx, mapped to 0x%p, using %dk, total %dk\n",
1748                 info->fix.smem_start, info->screen_base,
1749                 info->fix.smem_len / 1024, par->vbe_ib.total_memory * 64);
1750         fb_info(info, "%s frame buffer device\n", info->fix.id);
1751
1752         err = sysfs_create_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1753         if (err != 0)
1754                 fb_warn(info, "failed to register attributes\n");
1755
1756         return 0;
1757
1758 out_unmap:
1759         iounmap(info->screen_base);
1760 out_mem:
1761         release_mem_region(info->fix.smem_start, info->fix.smem_len);
1762 out_reg:
1763         release_region(0x3c0, 32);
1764 out_mode:
1765         if (!list_empty(&info->modelist))
1766                 fb_destroy_modelist(&info->modelist);
1767         fb_destroy_modedb(info->monspecs.modedb);
1768         fb_dealloc_cmap(&info->cmap);
1769 out:
1770         kfree(par->vbe_modes);
1771
1772         framebuffer_release(info);
1773         return err;
1774 }
1775
1776 static int uvesafb_remove(struct platform_device *dev)
1777 {
1778         struct fb_info *info = platform_get_drvdata(dev);
1779
1780         if (info) {
1781                 struct uvesafb_par *par = info->par;
1782
1783                 sysfs_remove_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1784                 unregister_framebuffer(info);
1785                 release_region(0x3c0, 32);
1786                 iounmap(info->screen_base);
1787                 arch_phys_wc_del(par->mtrr_handle);
1788                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1789                 fb_destroy_modedb(info->monspecs.modedb);
1790                 fb_dealloc_cmap(&info->cmap);
1791
1792                 kfree(par->vbe_modes);
1793                 kfree(par->vbe_state_orig);
1794                 kfree(par->vbe_state_saved);
1795
1796                 framebuffer_release(info);
1797         }
1798         return 0;
1799 }
1800
1801 static struct platform_driver uvesafb_driver = {
1802         .probe  = uvesafb_probe,
1803         .remove = uvesafb_remove,
1804         .driver = {
1805                 .name = "uvesafb",
1806         },
1807 };
1808
1809 static struct platform_device *uvesafb_device;
1810
1811 #ifndef MODULE
1812 static int uvesafb_setup(char *options)
1813 {
1814         char *this_opt;
1815
1816         if (!options || !*options)
1817                 return 0;
1818
1819         while ((this_opt = strsep(&options, ",")) != NULL) {
1820                 if (!*this_opt) continue;
1821
1822                 if (!strcmp(this_opt, "redraw"))
1823                         ypan = 0;
1824                 else if (!strcmp(this_opt, "ypan"))
1825                         ypan = 1;
1826                 else if (!strcmp(this_opt, "ywrap"))
1827                         ypan = 2;
1828                 else if (!strcmp(this_opt, "vgapal"))
1829                         pmi_setpal = false;
1830                 else if (!strcmp(this_opt, "pmipal"))
1831                         pmi_setpal = true;
1832                 else if (!strncmp(this_opt, "mtrr:", 5))
1833                         mtrr = simple_strtoul(this_opt+5, NULL, 0);
1834                 else if (!strcmp(this_opt, "nomtrr"))
1835                         mtrr = 0;
1836                 else if (!strcmp(this_opt, "nocrtc"))
1837                         nocrtc = true;
1838                 else if (!strcmp(this_opt, "noedid"))
1839                         noedid = true;
1840                 else if (!strcmp(this_opt, "noblank"))
1841                         blank = false;
1842                 else if (!strncmp(this_opt, "vtotal:", 7))
1843                         vram_total = simple_strtoul(this_opt + 7, NULL, 0);
1844                 else if (!strncmp(this_opt, "vremap:", 7))
1845                         vram_remap = simple_strtoul(this_opt + 7, NULL, 0);
1846                 else if (!strncmp(this_opt, "maxhf:", 6))
1847                         maxhf = simple_strtoul(this_opt + 6, NULL, 0);
1848                 else if (!strncmp(this_opt, "maxvf:", 6))
1849                         maxvf = simple_strtoul(this_opt + 6, NULL, 0);
1850                 else if (!strncmp(this_opt, "maxclk:", 7))
1851                         maxclk = simple_strtoul(this_opt + 7, NULL, 0);
1852                 else if (!strncmp(this_opt, "vbemode:", 8))
1853                         vbemode = simple_strtoul(this_opt + 8, NULL, 0);
1854                 else if (this_opt[0] >= '0' && this_opt[0] <= '9') {
1855                         mode_option = this_opt;
1856                 } else {
1857                         pr_warn("unrecognized option %s\n", this_opt);
1858                 }
1859         }
1860
1861         if (mtrr != 3 && mtrr != 0)
1862                 pr_warn("uvesafb: mtrr should be set to 0 or 3; %d is unsupported", mtrr);
1863
1864         return 0;
1865 }
1866 #endif /* !MODULE */
1867
1868 static ssize_t v86d_show(struct device_driver *dev, char *buf)
1869 {
1870         return snprintf(buf, PAGE_SIZE, "%s\n", v86d_path);
1871 }
1872
1873 static ssize_t v86d_store(struct device_driver *dev, const char *buf,
1874                 size_t count)
1875 {
1876         strncpy(v86d_path, buf, PATH_MAX - 1);
1877         return count;
1878 }
1879 static DRIVER_ATTR_RW(v86d);
1880
1881 static int uvesafb_init(void)
1882 {
1883         int err;
1884
1885 #ifndef MODULE
1886         char *option = NULL;
1887
1888         if (fb_get_options("uvesafb", &option))
1889                 return -ENODEV;
1890         uvesafb_setup(option);
1891 #endif
1892         err = cn_add_callback(&uvesafb_cn_id, "uvesafb", uvesafb_cn_callback);
1893         if (err)
1894                 return err;
1895
1896         err = platform_driver_register(&uvesafb_driver);
1897
1898         if (!err) {
1899                 uvesafb_device = platform_device_alloc("uvesafb", 0);
1900                 if (uvesafb_device)
1901                         err = platform_device_add(uvesafb_device);
1902                 else
1903                         err = -ENOMEM;
1904
1905                 if (err) {
1906                         platform_device_put(uvesafb_device);
1907                         platform_driver_unregister(&uvesafb_driver);
1908                         cn_del_callback(&uvesafb_cn_id);
1909                         return err;
1910                 }
1911
1912                 err = driver_create_file(&uvesafb_driver.driver,
1913                                 &driver_attr_v86d);
1914                 if (err) {
1915                         pr_warn("failed to register attributes\n");
1916                         err = 0;
1917                 }
1918         }
1919         return err;
1920 }
1921
1922 module_init(uvesafb_init);
1923
1924 static void uvesafb_exit(void)
1925 {
1926         struct uvesafb_ktask *task;
1927
1928         if (v86d_started) {
1929                 task = uvesafb_prep();
1930                 if (task) {
1931                         task->t.flags = TF_EXIT;
1932                         uvesafb_exec(task);
1933                         uvesafb_free(task);
1934                 }
1935         }
1936
1937         cn_del_callback(&uvesafb_cn_id);
1938         driver_remove_file(&uvesafb_driver.driver, &driver_attr_v86d);
1939         platform_device_unregister(uvesafb_device);
1940         platform_driver_unregister(&uvesafb_driver);
1941 }
1942
1943 module_exit(uvesafb_exit);
1944
1945 static int param_set_scroll(const char *val, const struct kernel_param *kp)
1946 {
1947         ypan = 0;
1948
1949         if (!strcmp(val, "redraw"))
1950                 ypan = 0;
1951         else if (!strcmp(val, "ypan"))
1952                 ypan = 1;
1953         else if (!strcmp(val, "ywrap"))
1954                 ypan = 2;
1955         else
1956                 return -EINVAL;
1957
1958         return 0;
1959 }
1960 static const struct kernel_param_ops param_ops_scroll = {
1961         .set = param_set_scroll,
1962 };
1963 #define param_check_scroll(name, p) __param_check(name, p, void)
1964
1965 module_param_named(scroll, ypan, scroll, 0);
1966 MODULE_PARM_DESC(scroll,
1967         "Scrolling mode, set to 'redraw', 'ypan', or 'ywrap'");
1968 module_param_named(vgapal, pmi_setpal, invbool, 0);
1969 MODULE_PARM_DESC(vgapal, "Set palette using VGA registers");
1970 module_param_named(pmipal, pmi_setpal, bool, 0);
1971 MODULE_PARM_DESC(pmipal, "Set palette using PMI calls");
1972 module_param(mtrr, uint, 0);
1973 MODULE_PARM_DESC(mtrr,
1974         "Memory Type Range Registers setting. Use 0 to disable.");
1975 module_param(blank, bool, 0);
1976 MODULE_PARM_DESC(blank, "Enable hardware blanking");
1977 module_param(nocrtc, bool, 0);
1978 MODULE_PARM_DESC(nocrtc, "Ignore CRTC timings when setting modes");
1979 module_param(noedid, bool, 0);
1980 MODULE_PARM_DESC(noedid,
1981         "Ignore EDID-provided monitor limits when setting modes");
1982 module_param(vram_remap, uint, 0);
1983 MODULE_PARM_DESC(vram_remap, "Set amount of video memory to be used [MiB]");
1984 module_param(vram_total, uint, 0);
1985 MODULE_PARM_DESC(vram_total, "Set total amount of video memory [MiB]");
1986 module_param(maxclk, ushort, 0);
1987 MODULE_PARM_DESC(maxclk, "Maximum pixelclock [MHz], overrides EDID data");
1988 module_param(maxhf, ushort, 0);
1989 MODULE_PARM_DESC(maxhf,
1990         "Maximum horizontal frequency [kHz], overrides EDID data");
1991 module_param(maxvf, ushort, 0);
1992 MODULE_PARM_DESC(maxvf,
1993         "Maximum vertical frequency [Hz], overrides EDID data");
1994 module_param(mode_option, charp, 0);
1995 MODULE_PARM_DESC(mode_option,
1996         "Specify initial video mode as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");
1997 module_param(vbemode, ushort, 0);
1998 MODULE_PARM_DESC(vbemode,
1999         "VBE mode number to set, overrides the 'mode' option");
2000 module_param_string(v86d, v86d_path, PATH_MAX, 0660);
2001 MODULE_PARM_DESC(v86d, "Path to the v86d userspace helper.");
2002
2003 MODULE_LICENSE("GPL");
2004 MODULE_AUTHOR("Michal Januszewski <spock@gentoo.org>");
2005 MODULE_DESCRIPTION("Framebuffer driver for VBE2.0+ compliant graphics boards");
2006