drivers/firmware/efi/libstub/gop.c

   1 /* -----------------------------------------------------------------------
   2  *
   3  *   Copyright 2011 Intel Corporation; author Matt Fleming
   4  *
   5  *   This file is part of the Linux kernel, and is made available under
   6  *   the terms of the GNU General Public License version 2.
   7  *
   8  * ----------------------------------------------------------------------- */
   9
  10 #include <linux/efi.h>
  11 #include <linux/screen_info.h>
  12 #include <asm/efi.h>
  13 #include <asm/setup.h>
  14
  15 static void find_bits(unsigned long mask, u8 *pos, u8 *size)
  16 {
  17         u8 first, len;
  18
  19         first = 0;
  20         len = 0;
  21
  22         if (mask) {
  23                 while (!(mask & 0x1)) {
  24                         mask = mask >> 1;
  25                         first++;
  26                 }
  27
  28                 while (mask & 0x1) {
  29                         mask = mask >> 1;
  30                         len++;
  31                 }
  32         }
  33
  34         *pos = first;
  35         *size = len;
  36 }
  37
  38 static void
  39 setup_pixel_info(struct screen_info *si, u32 pixels_per_scan_line,
  40                  struct efi_pixel_bitmask pixel_info, int pixel_format)
  41 {
  42         if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) {
  43                 si->lfb_depth = 32;
  44                 si->lfb_linelength = pixels_per_scan_line * 4;
  45                 si->red_size = 8;
  46                 si->red_pos = 0;
  47                 si->green_size = 8;
  48                 si->green_pos = 8;
  49                 si->blue_size = 8;
  50                 si->blue_pos = 16;
  51                 si->rsvd_size = 8;
  52                 si->rsvd_pos = 24;
  53         } else if (pixel_format == PIXEL_BGR_RESERVED_8BIT_PER_COLOR) {
  54                 si->lfb_depth = 32;
  55                 si->lfb_linelength = pixels_per_scan_line * 4;
  56                 si->red_size = 8;
  57                 si->red_pos = 16;
  58                 si->green_size = 8;
  59                 si->green_pos = 8;
  60                 si->blue_size = 8;
  61                 si->blue_pos = 0;
  62                 si->rsvd_size = 8;
  63                 si->rsvd_pos = 24;
  64         } else if (pixel_format == PIXEL_BIT_MASK) {
  65                 find_bits(pixel_info.red_mask, &si->red_pos, &si->red_size);
  66                 find_bits(pixel_info.green_mask, &si->green_pos,
  67                           &si->green_size);
  68                 find_bits(pixel_info.blue_mask, &si->blue_pos, &si->blue_size);
  69                 find_bits(pixel_info.reserved_mask, &si->rsvd_pos,
  70                           &si->rsvd_size);
  71                 si->lfb_depth = si->red_size + si->green_size +
  72                         si->blue_size + si->rsvd_size;
  73                 si->lfb_linelength = (pixels_per_scan_line * si->lfb_depth) / 8;
  74         } else {
  75                 si->lfb_depth = 4;
  76                 si->lfb_linelength = si->lfb_width / 2;
  77                 si->red_size = 0;
  78                 si->red_pos = 0;
  79                 si->green_size = 0;
  80                 si->green_pos = 0;
  81                 si->blue_size = 0;
  82                 si->blue_pos = 0;
  83                 si->rsvd_size = 0;
  84                 si->rsvd_pos = 0;
  85         }
  86 }
  87
  88 static efi_status_t
  89 setup_gop32(efi_system_table_t *sys_table_arg, struct screen_info *si,
  90             efi_guid_t *proto, unsigned long size, void **gop_handle)
  91 {
  92         struct efi_graphics_output_protocol_32 *gop32, *first_gop;
  93         unsigned long nr_gops;
  94         u16 width, height;
  95         u32 pixels_per_scan_line;
  96         u32 ext_lfb_base;
  97         u64 fb_base;
  98         struct efi_pixel_bitmask pixel_info;
  99         int pixel_format;
 100         efi_status_t status;
 101         u32 *handles = (u32 *)(unsigned long)gop_handle;
 102         int i;
 103
 104         first_gop = NULL;
 105         gop32 = NULL;
 106
 107         nr_gops = size / sizeof(u32);
 108         for (i = 0; i < nr_gops; i++) {
 109                 struct efi_graphics_output_protocol_mode_32 *mode;
 110                 struct efi_graphics_output_mode_info *info = NULL;
 111                 efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
 112                 bool conout_found = false;
 113                 void *dummy = NULL;
 114                 efi_handle_t h = (efi_handle_t)(unsigned long)handles[i];
 115                 u64 current_fb_base;
 116
 117                 status = efi_call_early(handle_protocol, h,
 118                                         proto, (void **)&gop32);
 119                 if (status != EFI_SUCCESS)
 120                         continue;
 121
 122                 status = efi_call_early(handle_protocol, h,
 123                                         &conout_proto, &dummy);
 124                 if (status == EFI_SUCCESS)
 125                         conout_found = true;
 126
 127                 mode = (void *)(unsigned long)gop32->mode;
 128                 info = (void *)(unsigned long)mode->info;
 129                 current_fb_base = mode->frame_buffer_base;
 130
 131                 if ((!first_gop || conout_found) &&
 132                     info->pixel_format != PIXEL_BLT_ONLY) {
 133                         /*
 134                          * Systems that use the UEFI Console Splitter may
 135                          * provide multiple GOP devices, not all of which are
 136                          * backed by real hardware. The workaround is to search
 137                          * for a GOP implementing the ConOut protocol, and if
 138                          * one isn't found, to just fall back to the first GOP.
 139                          */
 140                         width = info->horizontal_resolution;
 141                         height = info->vertical_resolution;
 142                         pixel_format = info->pixel_format;
 143                         pixel_info = info->pixel_information;
 144                         pixels_per_scan_line = info->pixels_per_scan_line;
 145                         fb_base = current_fb_base;
 146
 147                         /*
 148                          * Once we've found a GOP supporting ConOut,
 149                          * don't bother looking any further.
 150                          */
 151                         first_gop = gop32;
 152                         if (conout_found)
 153                                 break;
 154                 }
 155         }
 156
 157         /* Did we find any GOPs? */
 158         if (!first_gop)
 159                 return EFI_NOT_FOUND;
 160
 161         /* EFI framebuffer */
 162         si->orig_video_isVGA = VIDEO_TYPE_EFI;
 163
 164         si->lfb_width = width;
 165         si->lfb_height = height;
 166         si->lfb_base = fb_base;
 167
 168         ext_lfb_base = (u64)(unsigned long)fb_base >> 32;
 169         if (ext_lfb_base) {
 170                 si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
 171                 si->ext_lfb_base = ext_lfb_base;
 172         }
 173
 174         si->pages = 1;
 175
 176         setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);
 177
 178         si->lfb_size = si->lfb_linelength * si->lfb_height;
 179
 180         si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
 181
 182         return EFI_SUCCESS;
 183 }
 184
 185 static efi_status_t
 186 setup_gop64(efi_system_table_t *sys_table_arg, struct screen_info *si,
 187             efi_guid_t *proto, unsigned long size, void **gop_handle)
 188 {
 189         struct efi_graphics_output_protocol_64 *gop64, *first_gop;
 190         unsigned long nr_gops;
 191         u16 width, height;
 192         u32 pixels_per_scan_line;
 193         u32 ext_lfb_base;
 194         u64 fb_base;
 195         struct efi_pixel_bitmask pixel_info;
 196         int pixel_format;
 197         efi_status_t status;
 198         u64 *handles = (u64 *)(unsigned long)gop_handle;
 199         int i;
 200
 201         first_gop = NULL;
 202         gop64 = NULL;
 203
 204         nr_gops = size / sizeof(u64);
 205         for (i = 0; i < nr_gops; i++) {
 206                 struct efi_graphics_output_protocol_mode_64 *mode;
 207                 struct efi_graphics_output_mode_info *info = NULL;
 208                 efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
 209                 bool conout_found = false;
 210                 void *dummy = NULL;
 211                 efi_handle_t h = (efi_handle_t)(unsigned long)handles[i];
 212                 u64 current_fb_base;
 213
 214                 status = efi_call_early(handle_protocol, h,
 215                                         proto, (void **)&gop64);
 216                 if (status != EFI_SUCCESS)
 217                         continue;
 218
 219                 status = efi_call_early(handle_protocol, h,
 220                                         &conout_proto, &dummy);
 221                 if (status == EFI_SUCCESS)
 222                         conout_found = true;
 223
 224                 mode = (void *)(unsigned long)gop64->mode;
 225                 info = (void *)(unsigned long)mode->info;
 226                 current_fb_base = mode->frame_buffer_base;
 227
 228                 if ((!first_gop || conout_found) &&
 229                     info->pixel_format != PIXEL_BLT_ONLY) {
 230                         /*
 231                          * Systems that use the UEFI Console Splitter may
 232                          * provide multiple GOP devices, not all of which are
 233                          * backed by real hardware. The workaround is to search
 234                          * for a GOP implementing the ConOut protocol, and if
 235                          * one isn't found, to just fall back to the first GOP.
 236                          */
 237                         width = info->horizontal_resolution;
 238                         height = info->vertical_resolution;
 239                         pixel_format = info->pixel_format;
 240                         pixel_info = info->pixel_information;
 241                         pixels_per_scan_line = info->pixels_per_scan_line;
 242                         fb_base = current_fb_base;
 243
 244                         /*
 245                          * Once we've found a GOP supporting ConOut,
 246                          * don't bother looking any further.
 247                          */
 248                         first_gop = gop64;
 249                         if (conout_found)
 250                                 break;
 251                 }
 252         }
 253
 254         /* Did we find any GOPs? */
 255         if (!first_gop)
 256                 return EFI_NOT_FOUND;
 257
 258         /* EFI framebuffer */
 259         si->orig_video_isVGA = VIDEO_TYPE_EFI;
 260
 261         si->lfb_width = width;
 262         si->lfb_height = height;
 263         si->lfb_base = fb_base;
 264
 265         ext_lfb_base = (u64)(unsigned long)fb_base >> 32;
 266         if (ext_lfb_base) {
 267                 si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
 268                 si->ext_lfb_base = ext_lfb_base;
 269         }
 270
 271         si->pages = 1;
 272
 273         setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);
 274
 275         si->lfb_size = si->lfb_linelength * si->lfb_height;
 276
 277         si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
 278
 279         return EFI_SUCCESS;
 280 }
 281
 282 /*
 283  * See if we have Graphics Output Protocol
 284  */
 285 efi_status_t efi_setup_gop(efi_system_table_t *sys_table_arg,
 286                            struct screen_info *si, efi_guid_t *proto,
 287                            unsigned long size)
 288 {
 289         efi_status_t status;
 290         void **gop_handle = NULL;
 291
 292         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
 293                                 size, (void **)&gop_handle);
 294         if (status != EFI_SUCCESS)
 295                 return status;
 296
 297         status = efi_call_early(locate_handle,
 298                                 EFI_LOCATE_BY_PROTOCOL,
 299                                 proto, NULL, &size, gop_handle);
 300         if (status != EFI_SUCCESS)
 301                 goto free_handle;
 302
 303         if (efi_is_64bit()) {
 304                 status = setup_gop64(sys_table_arg, si, proto, size,
 305                                      gop_handle);
 306         } else {
 307                 status = setup_gop32(sys_table_arg, si, proto, size,
 308                                      gop_handle);
 309         }
 310
 311 free_handle:
 312         efi_call_early(free_pool, gop_handle);
 313         return status;
 314 }