This source file includes following definitions.
- efifb_setcolreg
- efifb_copy_bmp
- efifb_bgrt_sanity_check
- efifb_bgrt_sanity_check
- efifb_show_boot_graphics
- efifb_show_boot_graphics
- efifb_destroy
- efifb_setup
- fb_base_is_valid
- efifb_probe
- efifb_remove
- record_efifb_bar_resource
- efifb_fixup_resources
1
2
3
4
5
6
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 <video/vga.h>
20 #include <asm/efi.h>
21 #include <drm/drm_utils.h>
22 #include <drm/drm_connector.h>
23
24 struct bmp_file_header {
25 u16 id;
26 u32 file_size;
27 u32 reserved;
28 u32 bitmap_offset;
29 } __packed;
30
31 struct bmp_dib_header {
32 u32 dib_header_size;
33 s32 width;
34 s32 height;
35 u16 planes;
36 u16 bpp;
37 u32 compression;
38 u32 bitmap_size;
39 u32 horz_resolution;
40 u32 vert_resolution;
41 u32 colors_used;
42 u32 colors_important;
43 } __packed;
44
45 static bool use_bgrt = true;
46 static bool request_mem_succeeded = false;
47 static u64 mem_flags = EFI_MEMORY_WC | EFI_MEMORY_UC;
48
49 static struct fb_var_screeninfo efifb_defined = {
50 .activate = FB_ACTIVATE_NOW,
51 .height = -1,
52 .width = -1,
53 .right_margin = 32,
54 .upper_margin = 16,
55 .lower_margin = 4,
56 .vsync_len = 4,
57 .vmode = FB_VMODE_NONINTERLACED,
58 };
59
60 static struct fb_fix_screeninfo efifb_fix = {
61 .id = "EFI VGA",
62 .type = FB_TYPE_PACKED_PIXELS,
63 .accel = FB_ACCEL_NONE,
64 .visual = FB_VISUAL_TRUECOLOR,
65 };
66
67 static int efifb_setcolreg(unsigned regno, unsigned red, unsigned green,
68 unsigned blue, unsigned transp,
69 struct fb_info *info)
70 {
71
72
73
74
75
76
77
78 if (regno >= info->cmap.len)
79 return 1;
80
81 if (regno < 16) {
82 red >>= 16 - info->var.red.length;
83 green >>= 16 - info->var.green.length;
84 blue >>= 16 - info->var.blue.length;
85 ((u32 *)(info->pseudo_palette))[regno] =
86 (red << info->var.red.offset) |
87 (green << info->var.green.offset) |
88 (blue << info->var.blue.offset);
89 }
90 return 0;
91 }
92
93
94
95
96
97
98
99 #if defined CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER && \
100 defined CONFIG_ACPI_BGRT
101 static void efifb_copy_bmp(u8 *src, u32 *dst, int width, struct screen_info *si)
102 {
103 u8 r, g, b;
104
105 while (width--) {
106 b = *src++;
107 g = *src++;
108 r = *src++;
109 *dst++ = (r << si->red_pos) |
110 (g << si->green_pos) |
111 (b << si->blue_pos);
112 }
113 }
114
115 #ifdef CONFIG_X86
116
117
118
119
120
121
122
123 static bool efifb_bgrt_sanity_check(struct screen_info *si, u32 bmp_width)
124 {
125
126
127
128
129 u32 expected_xoffset = (si->lfb_width - bmp_width) / 2;
130
131 return bgrt_tab.image_offset_x == expected_xoffset;
132 }
133 #else
134 static bool efifb_bgrt_sanity_check(struct screen_info *si, u32 bmp_width)
135 {
136 return true;
137 }
138 #endif
139
140 static void efifb_show_boot_graphics(struct fb_info *info)
141 {
142 u32 bmp_width, bmp_height, bmp_pitch, screen_pitch, dst_x, y, src_y;
143 struct screen_info *si = &screen_info;
144 struct bmp_file_header *file_header;
145 struct bmp_dib_header *dib_header;
146 void *bgrt_image = NULL;
147 u8 *dst = info->screen_base;
148
149 if (!use_bgrt)
150 return;
151
152 if (!bgrt_tab.image_address) {
153 pr_info("efifb: No BGRT, not showing boot graphics\n");
154 return;
155 }
156
157 if (bgrt_tab.status & 0x06) {
158 pr_info("efifb: BGRT rotation bits set, not showing boot graphics\n");
159 return;
160 }
161
162
163 if (console_loglevel > CONSOLE_LOGLEVEL_QUIET)
164 return;
165
166
167
168 if (si->lfb_depth != 32) {
169 pr_info("efifb: not 32 bits, not showing boot graphics\n");
170 return;
171 }
172
173 bgrt_image = memremap(bgrt_tab.image_address, bgrt_image_size,
174 MEMREMAP_WB);
175 if (!bgrt_image) {
176 pr_warn("efifb: Ignoring BGRT: failed to map image memory\n");
177 return;
178 }
179
180 if (bgrt_image_size < (sizeof(*file_header) + sizeof(*dib_header)))
181 goto error;
182
183 file_header = bgrt_image;
184 if (file_header->id != 0x4d42 || file_header->reserved != 0)
185 goto error;
186
187 dib_header = bgrt_image + sizeof(*file_header);
188 if (dib_header->dib_header_size != 40 || dib_header->width < 0 ||
189 dib_header->planes != 1 || dib_header->bpp != 24 ||
190 dib_header->compression != 0)
191 goto error;
192
193 bmp_width = dib_header->width;
194 bmp_height = abs(dib_header->height);
195 bmp_pitch = round_up(3 * bmp_width, 4);
196 screen_pitch = si->lfb_linelength;
197
198 if ((file_header->bitmap_offset + bmp_pitch * bmp_height) >
199 bgrt_image_size)
200 goto error;
201
202 if ((bgrt_tab.image_offset_x + bmp_width) > si->lfb_width ||
203 (bgrt_tab.image_offset_y + bmp_height) > si->lfb_height)
204 goto error;
205
206 if (!efifb_bgrt_sanity_check(si, bmp_width))
207 goto error;
208
209 pr_info("efifb: showing boot graphics\n");
210
211 for (y = 0; y < si->lfb_height; y++, dst += si->lfb_linelength) {
212
213 if (y < bgrt_tab.image_offset_y ||
214 y >= (bgrt_tab.image_offset_y + bmp_height)) {
215 memset(dst, 0, 4 * si->lfb_width);
216 continue;
217 }
218
219 src_y = y - bgrt_tab.image_offset_y;
220
221 if (dib_header->height > 0)
222 src_y = (bmp_height - 1) - src_y;
223
224 memset(dst, 0, bgrt_tab.image_offset_x * 4);
225 dst_x = bgrt_tab.image_offset_x;
226 efifb_copy_bmp(bgrt_image + file_header->bitmap_offset +
227 src_y * bmp_pitch,
228 (u32 *)dst + dst_x, bmp_width, si);
229 dst_x += bmp_width;
230 memset((u32 *)dst + dst_x, 0, (si->lfb_width - dst_x) * 4);
231 }
232
233 memunmap(bgrt_image);
234 return;
235
236 error:
237 memunmap(bgrt_image);
238 pr_warn("efifb: Ignoring BGRT: unexpected or invalid BMP data\n");
239 }
240 #else
241 static inline void efifb_show_boot_graphics(struct fb_info *info) {}
242 #endif
243
244 static void efifb_destroy(struct fb_info *info)
245 {
246 if (info->screen_base) {
247 if (mem_flags & (EFI_MEMORY_UC | EFI_MEMORY_WC))
248 iounmap(info->screen_base);
249 else
250 memunmap(info->screen_base);
251 }
252 if (request_mem_succeeded)
253 release_mem_region(info->apertures->ranges[0].base,
254 info->apertures->ranges[0].size);
255 fb_dealloc_cmap(&info->cmap);
256 }
257
258 static struct fb_ops efifb_ops = {
259 .owner = THIS_MODULE,
260 .fb_destroy = efifb_destroy,
261 .fb_setcolreg = efifb_setcolreg,
262 .fb_fillrect = cfb_fillrect,
263 .fb_copyarea = cfb_copyarea,
264 .fb_imageblit = cfb_imageblit,
265 };
266
267 static int efifb_setup(char *options)
268 {
269 char *this_opt;
270
271 if (options && *options) {
272 while ((this_opt = strsep(&options, ",")) != NULL) {
273 if (!*this_opt) continue;
274
275 efifb_setup_from_dmi(&screen_info, this_opt);
276
277 if (!strncmp(this_opt, "base:", 5))
278 screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
279 else if (!strncmp(this_opt, "stride:", 7))
280 screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
281 else if (!strncmp(this_opt, "height:", 7))
282 screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
283 else if (!strncmp(this_opt, "width:", 6))
284 screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
285 else if (!strcmp(this_opt, "nowc"))
286 mem_flags &= ~EFI_MEMORY_WC;
287 else if (!strcmp(this_opt, "nobgrt"))
288 use_bgrt = false;
289 }
290 }
291
292 return 0;
293 }
294
295 static inline bool fb_base_is_valid(void)
296 {
297 if (screen_info.lfb_base)
298 return true;
299
300 if (!(screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE))
301 return false;
302
303 if (screen_info.ext_lfb_base)
304 return true;
305
306 return false;
307 }
308
309 #define efifb_attr_decl(name, fmt) \
310 static ssize_t name##_show(struct device *dev, \
311 struct device_attribute *attr, \
312 char *buf) \
313 { \
314 return sprintf(buf, fmt "\n", (screen_info.lfb_##name)); \
315 } \
316 static DEVICE_ATTR_RO(name)
317
318 efifb_attr_decl(base, "0x%x");
319 efifb_attr_decl(linelength, "%u");
320 efifb_attr_decl(height, "%u");
321 efifb_attr_decl(width, "%u");
322 efifb_attr_decl(depth, "%u");
323
324 static struct attribute *efifb_attrs[] = {
325 &dev_attr_base.attr,
326 &dev_attr_linelength.attr,
327 &dev_attr_width.attr,
328 &dev_attr_height.attr,
329 &dev_attr_depth.attr,
330 NULL
331 };
332 ATTRIBUTE_GROUPS(efifb);
333
334 static bool pci_dev_disabled;
335
336 static struct pci_dev *efifb_pci_dev;
337 static struct resource *bar_resource;
338 static u64 bar_offset;
339
340 static int efifb_probe(struct platform_device *dev)
341 {
342 struct fb_info *info;
343 int err, orientation;
344 unsigned int size_vmode;
345 unsigned int size_remap;
346 unsigned int size_total;
347 char *option = NULL;
348 efi_memory_desc_t md;
349
350 if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI || pci_dev_disabled)
351 return -ENODEV;
352
353 if (fb_get_options("efifb", &option))
354 return -ENODEV;
355 efifb_setup(option);
356
357
358
359
360
361 if (!screen_info.lfb_linelength)
362 return -ENODEV;
363
364 if (!screen_info.lfb_depth)
365 screen_info.lfb_depth = 32;
366 if (!screen_info.pages)
367 screen_info.pages = 1;
368 if (!fb_base_is_valid()) {
369 printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
370 return -ENODEV;
371 }
372 printk(KERN_INFO "efifb: probing for efifb\n");
373
374
375 if (!screen_info.blue_size) {
376 screen_info.blue_size = 8;
377 screen_info.blue_pos = 0;
378 screen_info.green_size = 8;
379 screen_info.green_pos = 8;
380 screen_info.red_size = 8;
381 screen_info.red_pos = 16;
382 screen_info.rsvd_size = 8;
383 screen_info.rsvd_pos = 24;
384 }
385
386 efifb_fix.smem_start = screen_info.lfb_base;
387
388 if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE) {
389 u64 ext_lfb_base;
390
391 ext_lfb_base = (u64)(unsigned long)screen_info.ext_lfb_base << 32;
392 efifb_fix.smem_start |= ext_lfb_base;
393 }
394
395 if (bar_resource &&
396 bar_resource->start + bar_offset != efifb_fix.smem_start) {
397 dev_info(&efifb_pci_dev->dev,
398 "BAR has moved, updating efifb address\n");
399 efifb_fix.smem_start = bar_resource->start + bar_offset;
400 }
401
402 efifb_defined.bits_per_pixel = screen_info.lfb_depth;
403 efifb_defined.xres = screen_info.lfb_width;
404 efifb_defined.yres = screen_info.lfb_height;
405 efifb_fix.line_length = screen_info.lfb_linelength;
406
407
408
409
410 size_vmode = efifb_defined.yres * efifb_fix.line_length;
411
412
413
414
415 size_total = screen_info.lfb_size;
416 if (size_total < size_vmode)
417 size_total = size_vmode;
418
419
420
421
422
423 size_remap = size_vmode * 2;
424 if (size_remap > size_total)
425 size_remap = size_total;
426 if (size_remap % PAGE_SIZE)
427 size_remap += PAGE_SIZE - (size_remap % PAGE_SIZE);
428 efifb_fix.smem_len = size_remap;
429
430 if (request_mem_region(efifb_fix.smem_start, size_remap, "efifb")) {
431 request_mem_succeeded = true;
432 } else {
433
434
435 pr_warn("efifb: cannot reserve video memory at 0x%lx\n",
436 efifb_fix.smem_start);
437 }
438
439 info = framebuffer_alloc(sizeof(u32) * 16, &dev->dev);
440 if (!info) {
441 err = -ENOMEM;
442 goto err_release_mem;
443 }
444 platform_set_drvdata(dev, info);
445 info->pseudo_palette = info->par;
446 info->par = NULL;
447
448 info->apertures = alloc_apertures(1);
449 if (!info->apertures) {
450 err = -ENOMEM;
451 goto err_release_fb;
452 }
453 info->apertures->ranges[0].base = efifb_fix.smem_start;
454 info->apertures->ranges[0].size = size_remap;
455
456 if (efi_enabled(EFI_BOOT) &&
457 !efi_mem_desc_lookup(efifb_fix.smem_start, &md)) {
458 if ((efifb_fix.smem_start + efifb_fix.smem_len) >
459 (md.phys_addr + (md.num_pages << EFI_PAGE_SHIFT))) {
460 pr_err("efifb: video memory @ 0x%lx spans multiple EFI memory regions\n",
461 efifb_fix.smem_start);
462 err = -EIO;
463 goto err_release_fb;
464 }
465
466
467
468
469 md.attribute &= EFI_MEMORY_UC | EFI_MEMORY_WC |
470 EFI_MEMORY_WT | EFI_MEMORY_WB;
471 if (md.attribute) {
472 mem_flags |= EFI_MEMORY_WT | EFI_MEMORY_WB;
473 mem_flags &= md.attribute;
474 }
475 }
476 if (mem_flags & EFI_MEMORY_WC)
477 info->screen_base = ioremap_wc(efifb_fix.smem_start,
478 efifb_fix.smem_len);
479 else if (mem_flags & EFI_MEMORY_UC)
480 info->screen_base = ioremap(efifb_fix.smem_start,
481 efifb_fix.smem_len);
482 else if (mem_flags & EFI_MEMORY_WT)
483 info->screen_base = memremap(efifb_fix.smem_start,
484 efifb_fix.smem_len, MEMREMAP_WT);
485 else if (mem_flags & EFI_MEMORY_WB)
486 info->screen_base = memremap(efifb_fix.smem_start,
487 efifb_fix.smem_len, MEMREMAP_WB);
488 if (!info->screen_base) {
489 pr_err("efifb: abort, cannot remap video memory 0x%x @ 0x%lx\n",
490 efifb_fix.smem_len, efifb_fix.smem_start);
491 err = -EIO;
492 goto err_release_fb;
493 }
494
495 efifb_show_boot_graphics(info);
496
497 pr_info("efifb: framebuffer at 0x%lx, using %dk, total %dk\n",
498 efifb_fix.smem_start, size_remap/1024, size_total/1024);
499 pr_info("efifb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
500 efifb_defined.xres, efifb_defined.yres,
501 efifb_defined.bits_per_pixel, efifb_fix.line_length,
502 screen_info.pages);
503
504 efifb_defined.xres_virtual = efifb_defined.xres;
505 efifb_defined.yres_virtual = efifb_fix.smem_len /
506 efifb_fix.line_length;
507 pr_info("efifb: scrolling: redraw\n");
508 efifb_defined.yres_virtual = efifb_defined.yres;
509
510
511 efifb_defined.pixclock = 10000000 / efifb_defined.xres *
512 1000 / efifb_defined.yres;
513 efifb_defined.left_margin = (efifb_defined.xres / 8) & 0xf8;
514 efifb_defined.hsync_len = (efifb_defined.xres / 8) & 0xf8;
515
516 efifb_defined.red.offset = screen_info.red_pos;
517 efifb_defined.red.length = screen_info.red_size;
518 efifb_defined.green.offset = screen_info.green_pos;
519 efifb_defined.green.length = screen_info.green_size;
520 efifb_defined.blue.offset = screen_info.blue_pos;
521 efifb_defined.blue.length = screen_info.blue_size;
522 efifb_defined.transp.offset = screen_info.rsvd_pos;
523 efifb_defined.transp.length = screen_info.rsvd_size;
524
525 pr_info("efifb: %s: "
526 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
527 "Truecolor",
528 screen_info.rsvd_size,
529 screen_info.red_size,
530 screen_info.green_size,
531 screen_info.blue_size,
532 screen_info.rsvd_pos,
533 screen_info.red_pos,
534 screen_info.green_pos,
535 screen_info.blue_pos);
536
537 efifb_fix.ypanstep = 0;
538 efifb_fix.ywrapstep = 0;
539
540 info->fbops = &efifb_ops;
541 info->var = efifb_defined;
542 info->fix = efifb_fix;
543 info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE;
544
545 orientation = drm_get_panel_orientation_quirk(efifb_defined.xres,
546 efifb_defined.yres);
547 switch (orientation) {
548 default:
549 info->fbcon_rotate_hint = FB_ROTATE_UR;
550 break;
551 case DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP:
552 info->fbcon_rotate_hint = FB_ROTATE_UD;
553 break;
554 case DRM_MODE_PANEL_ORIENTATION_LEFT_UP:
555 info->fbcon_rotate_hint = FB_ROTATE_CCW;
556 break;
557 case DRM_MODE_PANEL_ORIENTATION_RIGHT_UP:
558 info->fbcon_rotate_hint = FB_ROTATE_CW;
559 break;
560 }
561
562 err = sysfs_create_groups(&dev->dev.kobj, efifb_groups);
563 if (err) {
564 pr_err("efifb: cannot add sysfs attrs\n");
565 goto err_unmap;
566 }
567 err = fb_alloc_cmap(&info->cmap, 256, 0);
568 if (err < 0) {
569 pr_err("efifb: cannot allocate colormap\n");
570 goto err_groups;
571 }
572 err = register_framebuffer(info);
573 if (err < 0) {
574 pr_err("efifb: cannot register framebuffer\n");
575 goto err_fb_dealoc;
576 }
577 fb_info(info, "%s frame buffer device\n", info->fix.id);
578 return 0;
579
580 err_fb_dealoc:
581 fb_dealloc_cmap(&info->cmap);
582 err_groups:
583 sysfs_remove_groups(&dev->dev.kobj, efifb_groups);
584 err_unmap:
585 if (mem_flags & (EFI_MEMORY_UC | EFI_MEMORY_WC))
586 iounmap(info->screen_base);
587 else
588 memunmap(info->screen_base);
589 err_release_fb:
590 framebuffer_release(info);
591 err_release_mem:
592 if (request_mem_succeeded)
593 release_mem_region(efifb_fix.smem_start, size_total);
594 return err;
595 }
596
597 static int efifb_remove(struct platform_device *pdev)
598 {
599 struct fb_info *info = platform_get_drvdata(pdev);
600
601 unregister_framebuffer(info);
602 sysfs_remove_groups(&pdev->dev.kobj, efifb_groups);
603 framebuffer_release(info);
604
605 return 0;
606 }
607
608 static struct platform_driver efifb_driver = {
609 .driver = {
610 .name = "efi-framebuffer",
611 },
612 .probe = efifb_probe,
613 .remove = efifb_remove,
614 };
615
616 builtin_platform_driver(efifb_driver);
617
618 #if defined(CONFIG_PCI)
619
620 static void record_efifb_bar_resource(struct pci_dev *dev, int idx, u64 offset)
621 {
622 u16 word;
623
624 efifb_pci_dev = dev;
625
626 pci_read_config_word(dev, PCI_COMMAND, &word);
627 if (!(word & PCI_COMMAND_MEMORY)) {
628 pci_dev_disabled = true;
629 dev_err(&dev->dev,
630 "BAR %d: assigned to efifb but device is disabled!\n",
631 idx);
632 return;
633 }
634
635 bar_resource = &dev->resource[idx];
636 bar_offset = offset;
637
638 dev_info(&dev->dev, "BAR %d: assigned to efifb\n", idx);
639 }
640
641 static void efifb_fixup_resources(struct pci_dev *dev)
642 {
643 u64 base = screen_info.lfb_base;
644 u64 size = screen_info.lfb_size;
645 int i;
646
647 if (efifb_pci_dev || screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
648 return;
649
650 if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
651 base |= (u64)screen_info.ext_lfb_base << 32;
652
653 if (!base)
654 return;
655
656 for (i = 0; i <= PCI_STD_RESOURCE_END; i++) {
657 struct resource *res = &dev->resource[i];
658
659 if (!(res->flags & IORESOURCE_MEM))
660 continue;
661
662 if (res->start <= base && res->end >= base + size - 1) {
663 record_efifb_bar_resource(dev, i, base - res->start);
664 break;
665 }
666 }
667 }
668 DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY,
669 16, efifb_fixup_resources);
670
671 #endif