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[mirror_ubuntu-jammy-kernel.git] / drivers / video / fbdev / efifb.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Framebuffer driver for EFI/UEFI based system
4 *
5 * (c) 2006 Edgar Hucek <gimli@dark-green.com>
6 * Original efi driver written by Gerd Knorr <kraxel@goldbach.in-berlin.de>
7 *
8 */
9
10 #include <linux/kernel.h>
11 #include <linux/efi.h>
12 #include <linux/efi-bgrt.h>
13 #include <linux/errno.h>
14 #include <linux/fb.h>
15 #include <linux/pci.h>
16 #include <linux/platform_device.h>
17 #include <linux/printk.h>
18 #include <linux/screen_info.h>
19 #include <linux/pm_runtime.h>
20 #include <video/vga.h>
21 #include <asm/efi.h>
22 #include <drm/drm_utils.h> /* For drm_get_panel_orientation_quirk */
23 #include <drm/drm_connector.h> /* For DRM_MODE_PANEL_ORIENTATION_* */
24
25 struct bmp_file_header {
26 u16 id;
27 u32 file_size;
28 u32 reserved;
29 u32 bitmap_offset;
30 } __packed;
31
32 struct bmp_dib_header {
33 u32 dib_header_size;
34 s32 width;
35 s32 height;
36 u16 planes;
37 u16 bpp;
38 u32 compression;
39 u32 bitmap_size;
40 u32 horz_resolution;
41 u32 vert_resolution;
42 u32 colors_used;
43 u32 colors_important;
44 } __packed;
45
46 static bool use_bgrt = true;
47 static bool request_mem_succeeded = false;
48 static u64 mem_flags = EFI_MEMORY_WC | EFI_MEMORY_UC;
49
50 static struct pci_dev *efifb_pci_dev; /* dev with BAR covering the efifb */
51
52 static struct fb_var_screeninfo efifb_defined = {
53 .activate = FB_ACTIVATE_NOW,
54 .height = -1,
55 .width = -1,
56 .right_margin = 32,
57 .upper_margin = 16,
58 .lower_margin = 4,
59 .vsync_len = 4,
60 .vmode = FB_VMODE_NONINTERLACED,
61 };
62
63 static struct fb_fix_screeninfo efifb_fix = {
64 .id = "EFI VGA",
65 .type = FB_TYPE_PACKED_PIXELS,
66 .accel = FB_ACCEL_NONE,
67 .visual = FB_VISUAL_TRUECOLOR,
68 };
69
70 static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
71 unsigned blue, unsigned transp,
72 struct fb_info *info)
73 {
74 /*
75 * Set a single color register. The values supplied are
76 * already rounded down to the hardware's capabilities
77 * (according to the entries in the `var' structure). Return
78 * != 0 for invalid regno.
79 */
80
81 if (regno >= info->cmap.len)
82 return 1;
83
84 if (regno < 16) {
85 red >>= 16 - info->var.red.length;
86 green >>= 16 - info->var.green.length;
87 blue >>= 16 - info->var.blue.length;
88 ((u32 *)(info->pseudo_palette))[regno] =
89 (red << info->var.red.offset) |
90 (green << info->var.green.offset) |
91 (blue << info->var.blue.offset);
92 }
93 return 0;
94 }
95
96 /*
97 * If fbcon deffered console takeover is configured, the intent is for the
98 * framebuffer to show the boot graphics (e.g. vendor logo) until there is some
99 * (error) message to display. But the boot graphics may have been destroyed by
100 * e.g. option ROM output, detect this and restore the boot graphics.
101 */
102 #if defined CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER && \
103 defined CONFIG_ACPI_BGRT
104 static void efifb_copy_bmp(u8 *src, u32 *dst, int width, struct screen_info *si)
105 {
106 u8 r, g, b;
107
108 while (width--) {
109 b = *src++;
110 g = *src++;
111 r = *src++;
112 *dst++ = (r << si->red_pos) |
113 (g << si->green_pos) |
114 (b << si->blue_pos);
115 }
116 }
117
118 #ifdef CONFIG_X86
119 /*
120 * On x86 some firmwares use a low non native resolution for the display when
121 * they have shown some text messages. While keeping the bgrt filled with info
122 * for the native resolution. If the bgrt image intended for the native
123 * resolution still fits, it will be displayed very close to the right edge of
124 * the display looking quite bad. This function checks for this.
125 */
126 static bool efifb_bgrt_sanity_check(struct screen_info *si, u32 bmp_width)
127 {
128 /*
129 * All x86 firmwares horizontally center the image (the yoffset
130 * calculations differ between boards, but xoffset is predictable).
131 */
132 u32 expected_xoffset = (si->lfb_width - bmp_width) / 2;
133
134 return bgrt_tab.image_offset_x == expected_xoffset;
135 }
136 #else
137 static bool efifb_bgrt_sanity_check(struct screen_info *si, u32 bmp_width)
138 {
139 return true;
140 }
141 #endif
142
143 static void efifb_show_boot_graphics(struct fb_info *info)
144 {
145 u32 bmp_width, bmp_height, bmp_pitch, dst_x, y, src_y;
146 struct screen_info *si = &screen_info;
147 struct bmp_file_header *file_header;
148 struct bmp_dib_header *dib_header;
149 void *bgrt_image = NULL;
150 u8 *dst = info->screen_base;
151
152 if (!use_bgrt)
153 return;
154
155 if (!bgrt_tab.image_address) {
156 pr_info("efifb: No BGRT, not showing boot graphics\n");
157 return;
158 }
159
160 if (bgrt_tab.status & 0x06) {
161 pr_info("efifb: BGRT rotation bits set, not showing boot graphics\n");
162 return;
163 }
164
165 /* Avoid flashing the logo if we're going to print std probe messages */
166 if (console_loglevel > CONSOLE_LOGLEVEL_QUIET)
167 return;
168
169 /* bgrt_tab.status is unreliable, so we don't check it */
170
171 if (si->lfb_depth != 32) {
172 pr_info("efifb: not 32 bits, not showing boot graphics\n");
173 return;
174 }
175
176 bgrt_image = memremap(bgrt_tab.image_address, bgrt_image_size,
177 MEMREMAP_WB);
178 if (!bgrt_image) {
179 pr_warn("efifb: Ignoring BGRT: failed to map image memory\n");
180 return;
181 }
182
183 if (bgrt_image_size < (sizeof(*file_header) + sizeof(*dib_header)))
184 goto error;
185
186 file_header = bgrt_image;
187 if (file_header->id != 0x4d42 || file_header->reserved != 0)
188 goto error;
189
190 dib_header = bgrt_image + sizeof(*file_header);
191 if (dib_header->dib_header_size != 40 || dib_header->width < 0 ||
192 dib_header->planes != 1 || dib_header->bpp != 24 ||
193 dib_header->compression != 0)
194 goto error;
195
196 bmp_width = dib_header->width;
197 bmp_height = abs(dib_header->height);
198 bmp_pitch = round_up(3 * bmp_width, 4);
199
200 if ((file_header->bitmap_offset + bmp_pitch * bmp_height) >
201 bgrt_image_size)
202 goto error;
203
204 if ((bgrt_tab.image_offset_x + bmp_width) > si->lfb_width ||
205 (bgrt_tab.image_offset_y + bmp_height) > si->lfb_height)
206 goto error;
207
208 if (!efifb_bgrt_sanity_check(si, bmp_width))
209 goto error;
210
211 pr_info("efifb: showing boot graphics\n");
212
213 for (y = 0; y < si->lfb_height; y++, dst += si->lfb_linelength) {
214 /* Only background? */
215 if (y < bgrt_tab.image_offset_y ||
216 y >= (bgrt_tab.image_offset_y + bmp_height)) {
217 memset(dst, 0, 4 * si->lfb_width);
218 continue;
219 }
220
221 src_y = y - bgrt_tab.image_offset_y;
222 /* Positive header height means upside down row order */
223 if (dib_header->height > 0)
224 src_y = (bmp_height - 1) - src_y;
225
226 memset(dst, 0, bgrt_tab.image_offset_x * 4);
227 dst_x = bgrt_tab.image_offset_x;
228 efifb_copy_bmp(bgrt_image + file_header->bitmap_offset +
229 src_y * bmp_pitch,
230 (u32 *)dst + dst_x, bmp_width, si);
231 dst_x += bmp_width;
232 memset((u32 *)dst + dst_x, 0, (si->lfb_width - dst_x) * 4);
233 }
234
235 memunmap(bgrt_image);
236 return;
237
238 error:
239 memunmap(bgrt_image);
240 pr_warn("efifb: Ignoring BGRT: unexpected or invalid BMP data\n");
241 }
242 #else
243 static inline void efifb_show_boot_graphics(struct fb_info *info) {}
244 #endif
245
246 static void efifb_destroy(struct fb_info *info)
247 {
248 if (efifb_pci_dev)
249 pm_runtime_put(&efifb_pci_dev->dev);
250
251 if (info->screen_base) {
252 if (mem_flags & (EFI_MEMORY_UC | EFI_MEMORY_WC))
253 iounmap(info->screen_base);
254 else
255 memunmap(info->screen_base);
256 }
257 if (request_mem_succeeded)
258 release_mem_region(info->apertures->ranges[0].base,
259 info->apertures->ranges[0].size);
260 fb_dealloc_cmap(&info->cmap);
261 }
262
263 static const struct fb_ops efifb_ops = {
264 .owner = THIS_MODULE,
265 .fb_destroy = efifb_destroy,
266 .fb_setcolreg = efifb_setcolreg,
267 .fb_fillrect = cfb_fillrect,
268 .fb_copyarea = cfb_copyarea,
269 .fb_imageblit = cfb_imageblit,
270 };
271
272 static int efifb_setup(char *options)
273 {
274 char *this_opt;
275
276 if (options && *options) {
277 while ((this_opt = strsep(&options, ",")) != NULL) {
278 if (!*this_opt) continue;
279
280 efifb_setup_from_dmi(&screen_info, this_opt);
281
282 if (!strncmp(this_opt, "base:", 5))
283 screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
284 else if (!strncmp(this_opt, "stride:", 7))
285 screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
286 else if (!strncmp(this_opt, "height:", 7))
287 screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
288 else if (!strncmp(this_opt, "width:", 6))
289 screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
290 else if (!strcmp(this_opt, "nowc"))
291 mem_flags &= ~EFI_MEMORY_WC;
292 else if (!strcmp(this_opt, "nobgrt"))
293 use_bgrt = false;
294 }
295 }
296
297 return 0;
298 }
299
300 static inline bool fb_base_is_valid(void)
301 {
302 if (screen_info.lfb_base)
303 return true;
304
305 if (!(screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE))
306 return false;
307
308 if (screen_info.ext_lfb_base)
309 return true;
310
311 return false;
312 }
313
314 #define efifb_attr_decl(name, fmt) \
315 static ssize_t name##_show(struct device *dev, \
316 struct device_attribute *attr, \
317 char *buf) \
318 { \
319 return sprintf(buf, fmt "\n", (screen_info.lfb_##name)); \
320 } \
321 static DEVICE_ATTR_RO(name)
322
323 efifb_attr_decl(base, "0x%x");
324 efifb_attr_decl(linelength, "%u");
325 efifb_attr_decl(height, "%u");
326 efifb_attr_decl(width, "%u");
327 efifb_attr_decl(depth, "%u");
328
329 static struct attribute *efifb_attrs[] = {
330 &dev_attr_base.attr,
331 &dev_attr_linelength.attr,
332 &dev_attr_width.attr,
333 &dev_attr_height.attr,
334 &dev_attr_depth.attr,
335 NULL
336 };
337 ATTRIBUTE_GROUPS(efifb);
338
339 static bool pci_dev_disabled; /* FB base matches BAR of a disabled device */
340
341 static struct resource *bar_resource;
342 static u64 bar_offset;
343
344 static int efifb_probe(struct platform_device *dev)
345 {
346 struct fb_info *info;
347 int err, orientation;
348 unsigned int size_vmode;
349 unsigned int size_remap;
350 unsigned int size_total;
351 char *option = NULL;
352 efi_memory_desc_t md;
353
354 /*
355 * Generic drivers must not be registered if a framebuffer exists.
356 * If a native driver was probed, the display hardware was already
357 * taken and attempting to use the system framebuffer is dangerous.
358 */
359 if (num_registered_fb > 0) {
360 dev_err(&dev->dev,
361 "efifb: a framebuffer is already registered\n");
362 return -EINVAL;
363 }
364
365 if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI || pci_dev_disabled)
366 return -ENODEV;
367
368 if (fb_get_options("efifb", &option))
369 return -ENODEV;
370 efifb_setup(option);
371
372 /* We don't get linelength from UGA Draw Protocol, only from
373 * EFI Graphics Protocol. So if it's not in DMI, and it's not
374 * passed in from the user, we really can't use the framebuffer.
375 */
376 if (!screen_info.lfb_linelength)
377 return -ENODEV;
378
379 if (!screen_info.lfb_depth)
380 screen_info.lfb_depth = 32;
381 if (!screen_info.pages)
382 screen_info.pages = 1;
383 if (!fb_base_is_valid()) {
384 printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
385 return -ENODEV;
386 }
387 printk(KERN_INFO "efifb: probing for efifb\n");
388
389 /* just assume they're all unset if any are */
390 if (!screen_info.blue_size) {
391 screen_info.blue_size = 8;
392 screen_info.blue_pos = 0;
393 screen_info.green_size = 8;
394 screen_info.green_pos = 8;
395 screen_info.red_size = 8;
396 screen_info.red_pos = 16;
397 screen_info.rsvd_size = 8;
398 screen_info.rsvd_pos = 24;
399 }
400
401 efifb_fix.smem_start = screen_info.lfb_base;
402
403 if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) {
404 u64 ext_lfb_base;
405
406 ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32;
407 efifb_fix.smem_start |= ext_lfb_base;
408 }
409
410 if (bar_resource &&
411 bar_resource->start + bar_offset != efifb_fix.smem_start) {
412 dev_info(&efifb_pci_dev->dev,
413 "BAR has moved, updating efifb address\n");
414 efifb_fix.smem_start = bar_resource->start + bar_offset;
415 }
416
417 efifb_defined.bits_per_pixel = screen_info.lfb_depth;
418 efifb_defined.xres = screen_info.lfb_width;
419 efifb_defined.yres = screen_info.lfb_height;
420 efifb_fix.line_length = screen_info.lfb_linelength;
421
422 /* size_vmode -- that is the amount of memory needed for the
423 * used video mode, i.e. the minimum amount of
424 * memory we need. */
425 size_vmode = efifb_defined.yres * efifb_fix.line_length;
426
427 /* size_total -- all video memory we have. Used for
428 * entries, ressource allocation and bounds
429 * checking. */
430 size_total = screen_info.lfb_size;
431 if (size_total < size_vmode)
432 size_total = size_vmode;
433
434 /* size_remap -- the amount of video memory we are going to
435 * use for efifb. With modern cards it is no
436 * option to simply use size_total as that
437 * wastes plenty of kernel address space. */
438 size_remap = size_vmode * 2;
439 if (size_remap > size_total)
440 size_remap = size_total;
441 if (size_remap % PAGE_SIZE)
442 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
443 efifb_fix.smem_len = size_remap;
444
445 if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
446 request_mem_succeeded = true;
447 } else {
448 /* We cannot make this fatal. Sometimes this comes from magic
449 spaces our resource handlers simply don't know about */
450 pr_warn("efifb: cannot reserve video memory at 0x%lx\n",
451 efifb_fix.smem_start);
452 }
453
454 info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
455 if (!info) {
456 err = -ENOMEM;
457 goto err_release_mem;
458 }
459 platform_set_drvdata(dev, info);
460 info->pseudo_palette = info->par;
461 info->par = NULL;
462
463 info->apertures = alloc_apertures(1);
464 if (!info->apertures) {
465 err = -ENOMEM;
466 goto err_release_fb;
467 }
468 info->apertures->ranges[0].base = efifb_fix.smem_start;
469 info->apertures->ranges[0].size = size_remap;
470
471 if (efi_enabled(EFI_MEMMAP) &&
472 !efi_mem_desc_lookup(efifb_fix.smem_start, &md)) {
473 if ((efifb_fix.smem_start + efifb_fix.smem_len) >
474 (md.phys_addr + (md.num_pages << EFI_PAGE_SHIFT))) {
475 pr_err("efifb: video memory @ 0x%lx spans multiple EFI memory regions\n",
476 efifb_fix.smem_start);
477 err = -EIO;
478 goto err_release_fb;
479 }
480 /*
481 * If the UEFI memory map covers the efifb region, we may only
482 * remap it using the attributes the memory map prescribes.
483 */
484 md.attribute &= EFI_MEMORY_UC | EFI_MEMORY_WC |
485 EFI_MEMORY_WT | EFI_MEMORY_WB;
486 if (md.attribute) {
487 mem_flags |= EFI_MEMORY_WT | EFI_MEMORY_WB;
488 mem_flags &= md.attribute;
489 }
490 }
491 if (mem_flags & EFI_MEMORY_WC)
492 info->screen_base = ioremap_wc(efifb_fix.smem_start,
493 efifb_fix.smem_len);
494 else if (mem_flags & EFI_MEMORY_UC)
495 info->screen_base = ioremap(efifb_fix.smem_start,
496 efifb_fix.smem_len);
497 else if (mem_flags & EFI_MEMORY_WT)
498 info->screen_base = memremap(efifb_fix.smem_start,
499 efifb_fix.smem_len, MEMREMAP_WT);
500 else if (mem_flags & EFI_MEMORY_WB)
501 info->screen_base = memremap(efifb_fix.smem_start,
502 efifb_fix.smem_len, MEMREMAP_WB);
503 if (!info->screen_base) {
504 pr_err("efifb: abort, cannot remap video memory 0x%x @ 0x%lx\n",
505 efifb_fix.smem_len, efifb_fix.smem_start);
506 err = -EIO;
507 goto err_release_fb;
508 }
509
510 efifb_show_boot_graphics(info);
511
512 pr_info("efifb: framebuffer at 0x%lx, using %dk, total %dk\n",
513 efifb_fix.smem_start, size_remap/1024, size_total/1024);
514 pr_info("efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
515 efifb_defined.xres, efifb_defined.yres,
516 efifb_defined.bits_per_pixel, efifb_fix.line_length,
517 screen_info.pages);
518
519 efifb_defined.xres_virtual = efifb_defined.xres;
520 efifb_defined.yres_virtual = efifb_fix.smem_len /
521 efifb_fix.line_length;
522 pr_info("efifb: scrolling: redraw\n");
523 efifb_defined.yres_virtual = efifb_defined.yres;
524
525 /* some dummy values for timing to make fbset happy */
526 efifb_defined.pixclock = 10000000 / efifb_defined.xres *
527 1000 / efifb_defined.yres;
528 efifb_defined.left_margin = (efifb_defined.xres / 8) & 0xf8;
529 efifb_defined.hsync_len = (efifb_defined.xres / 8) & 0xf8;
530
531 efifb_defined.red.offset = screen_info.red_pos;
532 efifb_defined.red.length = screen_info.red_size;
533 efifb_defined.green.offset = screen_info.green_pos;
534 efifb_defined.green.length = screen_info.green_size;
535 efifb_defined.blue.offset = screen_info.blue_pos;
536 efifb_defined.blue.length = screen_info.blue_size;
537 efifb_defined.transp.offset = screen_info.rsvd_pos;
538 efifb_defined.transp.length = screen_info.rsvd_size;
539
540 pr_info("efifb: %s: "
541 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
542 "Truecolor",
543 screen_info.rsvd_size,
544 screen_info.red_size,
545 screen_info.green_size,
546 screen_info.blue_size,
547 screen_info.rsvd_pos,
548 screen_info.red_pos,
549 screen_info.green_pos,
550 screen_info.blue_pos);
551
552 efifb_fix.ypanstep = 0;
553 efifb_fix.ywrapstep = 0;
554
555 info->fbops = &efifb_ops;
556 info->var = efifb_defined;
557 info->fix = efifb_fix;
558 info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;
559
560 orientation = drm_get_panel_orientation_quirk(efifb_defined.xres,
561 efifb_defined.yres);
562 switch (orientation) {
563 default:
564 info->fbcon_rotate_hint = FB_ROTATE_UR;
565 break;
566 case DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP:
567 info->fbcon_rotate_hint = FB_ROTATE_UD;
568 break;
569 case DRM_MODE_PANEL_ORIENTATION_LEFT_UP:
570 info->fbcon_rotate_hint = FB_ROTATE_CCW;
571 break;
572 case DRM_MODE_PANEL_ORIENTATION_RIGHT_UP:
573 info->fbcon_rotate_hint = FB_ROTATE_CW;
574 break;
575 }
576
577 err = sysfs_create_groups(&dev->dev.kobj, efifb_groups);
578 if (err) {
579 pr_err("efifb: cannot add sysfs attrs\n");
580 goto err_unmap;
581 }
582 err = fb_alloc_cmap(&info->cmap, 256, 0);
583 if (err < 0) {
584 pr_err("efifb: cannot allocate colormap\n");
585 goto err_groups;
586 }
587
588 if (efifb_pci_dev)
589 WARN_ON(pm_runtime_get_sync(&efifb_pci_dev->dev) < 0);
590
591 err = register_framebuffer(info);
592 if (err < 0) {
593 pr_err("efifb: cannot register framebuffer\n");
594 goto err_put_rpm_ref;
595 }
596 fb_info(info, "%s frame buffer device\n", info->fix.id);
597 return 0;
598
599 err_put_rpm_ref:
600 if (efifb_pci_dev)
601 pm_runtime_put(&efifb_pci_dev->dev);
602
603 fb_dealloc_cmap(&info->cmap);
604 err_groups:
605 sysfs_remove_groups(&dev->dev.kobj, efifb_groups);
606 err_unmap:
607 if (mem_flags & (EFI_MEMORY_UC | EFI_MEMORY_WC))
608 iounmap(info->screen_base);
609 else
610 memunmap(info->screen_base);
611 err_release_fb:
612 framebuffer_release(info);
613 err_release_mem:
614 if (request_mem_succeeded)
615 release_mem_region(efifb_fix.smem_start, size_total);
616 return err;
617 }
618
619 static int efifb_remove(struct platform_device *pdev)
620 {
621 struct fb_info *info = platform_get_drvdata(pdev);
622
623 unregister_framebuffer(info);
624 sysfs_remove_groups(&pdev->dev.kobj, efifb_groups);
625 framebuffer_release(info);
626
627 return 0;
628 }
629
630 static struct platform_driver efifb_driver = {
631 .driver = {
632 .name = "efi-framebuffer",
633 },
634 .probe = efifb_probe,
635 .remove = efifb_remove,
636 };
637
638 builtin_platform_driver(efifb_driver);
639
640 #if defined(CONFIG_PCI)
641
642 static void record_efifb_bar_resource(struct pci_dev *dev, int idx, u64 offset)
643 {
644 u16 word;
645
646 efifb_pci_dev = dev;
647
648 pci_read_config_word(dev, PCI_COMMAND, &word);
649 if (!(word & PCI_COMMAND_MEMORY)) {
650 pci_dev_disabled = true;
651 dev_err(&dev->dev,
652 "BAR %d: assigned to efifb but device is disabled!\n",
653 idx);
654 return;
655 }
656
657 bar_resource = &dev->resource[idx];
658 bar_offset = offset;
659
660 dev_info(&dev->dev, "BAR %d: assigned to efifb\n", idx);
661 }
662
663 static void efifb_fixup_resources(struct pci_dev *dev)
664 {
665 u64 base = screen_info.lfb_base;
666 u64 size = screen_info.lfb_size;
667 int i;
668
669 if (efifb_pci_dev || screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
670 return;
671
672 if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
673 base |= (u64)screen_info.ext_lfb_base << 32;
674
675 if (!base)
676 return;
677
678 for (i = 0; i < PCI_STD_NUM_BARS; i++) {
679 struct resource *res = &dev->resource[i];
680
681 if (!(res->flags & IORESOURCE_MEM))
682 continue;
683
684 if (res->start <= base && res->end >= base + size - 1) {
685 record_efifb_bar_resource(dev, i, base - res->start);
686 break;
687 }
688 }
689 }
690 DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY,
691 16, efifb_fixup_resources);
692
693 #endif
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