Ard Biesheuvel | fc37206 | 2016-04-25 21:06:49 +0100 | [diff] [blame] | 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 | __gop_query32(efi_system_table_t *sys_table_arg, |
| 90 | struct efi_graphics_output_protocol_32 *gop32, |
| 91 | struct efi_graphics_output_mode_info **info, |
| 92 | unsigned long *size, u64 *fb_base) |
| 93 | { |
| 94 | struct efi_graphics_output_protocol_mode_32 *mode; |
| 95 | efi_graphics_output_protocol_query_mode query_mode; |
| 96 | efi_status_t status; |
| 97 | unsigned long m; |
| 98 | |
| 99 | m = gop32->mode; |
| 100 | mode = (struct efi_graphics_output_protocol_mode_32 *)m; |
| 101 | query_mode = (void *)(unsigned long)gop32->query_mode; |
| 102 | |
| 103 | status = __efi_call_early(query_mode, (void *)gop32, mode->mode, size, |
| 104 | info); |
| 105 | if (status != EFI_SUCCESS) |
| 106 | return status; |
| 107 | |
| 108 | *fb_base = mode->frame_buffer_base; |
| 109 | return status; |
| 110 | } |
| 111 | |
| 112 | static efi_status_t |
| 113 | setup_gop32(efi_system_table_t *sys_table_arg, struct screen_info *si, |
| 114 | efi_guid_t *proto, unsigned long size, void **gop_handle) |
| 115 | { |
| 116 | struct efi_graphics_output_protocol_32 *gop32, *first_gop; |
| 117 | unsigned long nr_gops; |
| 118 | u16 width, height; |
| 119 | u32 pixels_per_scan_line; |
| 120 | u32 ext_lfb_base; |
| 121 | u64 fb_base; |
| 122 | struct efi_pixel_bitmask pixel_info; |
| 123 | int pixel_format; |
| 124 | efi_status_t status = EFI_NOT_FOUND; |
| 125 | u32 *handles = (u32 *)(unsigned long)gop_handle; |
| 126 | int i; |
| 127 | |
| 128 | first_gop = NULL; |
| 129 | gop32 = NULL; |
| 130 | |
| 131 | nr_gops = size / sizeof(u32); |
| 132 | for (i = 0; i < nr_gops; i++) { |
| 133 | struct efi_graphics_output_mode_info *info = NULL; |
| 134 | efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID; |
| 135 | bool conout_found = false; |
| 136 | void *dummy = NULL; |
| 137 | efi_handle_t h = (efi_handle_t)(unsigned long)handles[i]; |
| 138 | u64 current_fb_base; |
| 139 | |
| 140 | status = efi_call_early(handle_protocol, h, |
| 141 | proto, (void **)&gop32); |
| 142 | if (status != EFI_SUCCESS) |
| 143 | continue; |
| 144 | |
| 145 | status = efi_call_early(handle_protocol, h, |
| 146 | &conout_proto, &dummy); |
| 147 | if (status == EFI_SUCCESS) |
| 148 | conout_found = true; |
| 149 | |
| 150 | status = __gop_query32(sys_table_arg, gop32, &info, &size, |
| 151 | ¤t_fb_base); |
| 152 | if (status == EFI_SUCCESS && (!first_gop || conout_found)) { |
| 153 | /* |
| 154 | * Systems that use the UEFI Console Splitter may |
| 155 | * provide multiple GOP devices, not all of which are |
| 156 | * backed by real hardware. The workaround is to search |
| 157 | * for a GOP implementing the ConOut protocol, and if |
| 158 | * one isn't found, to just fall back to the first GOP. |
| 159 | */ |
| 160 | width = info->horizontal_resolution; |
| 161 | height = info->vertical_resolution; |
| 162 | pixel_format = info->pixel_format; |
| 163 | pixel_info = info->pixel_information; |
| 164 | pixels_per_scan_line = info->pixels_per_scan_line; |
| 165 | fb_base = current_fb_base; |
| 166 | |
| 167 | /* |
| 168 | * Once we've found a GOP supporting ConOut, |
| 169 | * don't bother looking any further. |
| 170 | */ |
| 171 | first_gop = gop32; |
| 172 | if (conout_found) |
| 173 | break; |
| 174 | } |
| 175 | } |
| 176 | |
| 177 | /* Did we find any GOPs? */ |
| 178 | if (!first_gop) |
| 179 | goto out; |
| 180 | |
| 181 | /* EFI framebuffer */ |
| 182 | si->orig_video_isVGA = VIDEO_TYPE_EFI; |
| 183 | |
| 184 | si->lfb_width = width; |
| 185 | si->lfb_height = height; |
| 186 | si->lfb_base = fb_base; |
| 187 | |
| 188 | ext_lfb_base = (u64)(unsigned long)fb_base >> 32; |
| 189 | if (ext_lfb_base) { |
| 190 | si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE; |
| 191 | si->ext_lfb_base = ext_lfb_base; |
| 192 | } |
| 193 | |
| 194 | si->pages = 1; |
| 195 | |
| 196 | setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format); |
| 197 | |
| 198 | si->lfb_size = si->lfb_linelength * si->lfb_height; |
| 199 | |
| 200 | si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS; |
| 201 | out: |
| 202 | return status; |
| 203 | } |
| 204 | |
| 205 | static efi_status_t |
| 206 | __gop_query64(efi_system_table_t *sys_table_arg, |
| 207 | struct efi_graphics_output_protocol_64 *gop64, |
| 208 | struct efi_graphics_output_mode_info **info, |
| 209 | unsigned long *size, u64 *fb_base) |
| 210 | { |
| 211 | struct efi_graphics_output_protocol_mode_64 *mode; |
| 212 | efi_graphics_output_protocol_query_mode query_mode; |
| 213 | efi_status_t status; |
| 214 | unsigned long m; |
| 215 | |
| 216 | m = gop64->mode; |
| 217 | mode = (struct efi_graphics_output_protocol_mode_64 *)m; |
| 218 | query_mode = (void *)(unsigned long)gop64->query_mode; |
| 219 | |
| 220 | status = __efi_call_early(query_mode, (void *)gop64, mode->mode, size, |
| 221 | info); |
| 222 | if (status != EFI_SUCCESS) |
| 223 | return status; |
| 224 | |
| 225 | *fb_base = mode->frame_buffer_base; |
| 226 | return status; |
| 227 | } |
| 228 | |
| 229 | static efi_status_t |
| 230 | setup_gop64(efi_system_table_t *sys_table_arg, struct screen_info *si, |
| 231 | efi_guid_t *proto, unsigned long size, void **gop_handle) |
| 232 | { |
| 233 | struct efi_graphics_output_protocol_64 *gop64, *first_gop; |
| 234 | unsigned long nr_gops; |
| 235 | u16 width, height; |
| 236 | u32 pixels_per_scan_line; |
| 237 | u32 ext_lfb_base; |
| 238 | u64 fb_base; |
| 239 | struct efi_pixel_bitmask pixel_info; |
| 240 | int pixel_format; |
| 241 | efi_status_t status = EFI_NOT_FOUND; |
| 242 | u64 *handles = (u64 *)(unsigned long)gop_handle; |
| 243 | int i; |
| 244 | |
| 245 | first_gop = NULL; |
| 246 | gop64 = NULL; |
| 247 | |
| 248 | nr_gops = size / sizeof(u64); |
| 249 | for (i = 0; i < nr_gops; i++) { |
| 250 | struct efi_graphics_output_mode_info *info = NULL; |
| 251 | efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID; |
| 252 | bool conout_found = false; |
| 253 | void *dummy = NULL; |
| 254 | efi_handle_t h = (efi_handle_t)(unsigned long)handles[i]; |
| 255 | u64 current_fb_base; |
| 256 | |
| 257 | status = efi_call_early(handle_protocol, h, |
| 258 | proto, (void **)&gop64); |
| 259 | if (status != EFI_SUCCESS) |
| 260 | continue; |
| 261 | |
| 262 | status = efi_call_early(handle_protocol, h, |
| 263 | &conout_proto, &dummy); |
| 264 | if (status == EFI_SUCCESS) |
| 265 | conout_found = true; |
| 266 | |
| 267 | status = __gop_query64(sys_table_arg, gop64, &info, &size, |
| 268 | ¤t_fb_base); |
| 269 | if (status == EFI_SUCCESS && (!first_gop || conout_found)) { |
| 270 | /* |
| 271 | * Systems that use the UEFI Console Splitter may |
| 272 | * provide multiple GOP devices, not all of which are |
| 273 | * backed by real hardware. The workaround is to search |
| 274 | * for a GOP implementing the ConOut protocol, and if |
| 275 | * one isn't found, to just fall back to the first GOP. |
| 276 | */ |
| 277 | width = info->horizontal_resolution; |
| 278 | height = info->vertical_resolution; |
| 279 | pixel_format = info->pixel_format; |
| 280 | pixel_info = info->pixel_information; |
| 281 | pixels_per_scan_line = info->pixels_per_scan_line; |
| 282 | fb_base = current_fb_base; |
| 283 | |
| 284 | /* |
| 285 | * Once we've found a GOP supporting ConOut, |
| 286 | * don't bother looking any further. |
| 287 | */ |
| 288 | first_gop = gop64; |
| 289 | if (conout_found) |
| 290 | break; |
| 291 | } |
| 292 | } |
| 293 | |
| 294 | /* Did we find any GOPs? */ |
| 295 | if (!first_gop) |
| 296 | goto out; |
| 297 | |
| 298 | /* EFI framebuffer */ |
| 299 | si->orig_video_isVGA = VIDEO_TYPE_EFI; |
| 300 | |
| 301 | si->lfb_width = width; |
| 302 | si->lfb_height = height; |
| 303 | si->lfb_base = fb_base; |
| 304 | |
| 305 | ext_lfb_base = (u64)(unsigned long)fb_base >> 32; |
| 306 | if (ext_lfb_base) { |
| 307 | si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE; |
| 308 | si->ext_lfb_base = ext_lfb_base; |
| 309 | } |
| 310 | |
| 311 | si->pages = 1; |
| 312 | |
| 313 | setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format); |
| 314 | |
| 315 | si->lfb_size = si->lfb_linelength * si->lfb_height; |
| 316 | |
| 317 | si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS; |
| 318 | out: |
| 319 | return status; |
| 320 | } |
| 321 | |
| 322 | /* |
| 323 | * See if we have Graphics Output Protocol |
| 324 | */ |
| 325 | efi_status_t efi_setup_gop(efi_system_table_t *sys_table_arg, |
| 326 | struct screen_info *si, efi_guid_t *proto, |
| 327 | unsigned long size) |
| 328 | { |
| 329 | efi_status_t status; |
| 330 | void **gop_handle = NULL; |
| 331 | |
| 332 | status = efi_call_early(allocate_pool, EFI_LOADER_DATA, |
| 333 | size, (void **)&gop_handle); |
| 334 | if (status != EFI_SUCCESS) |
| 335 | return status; |
| 336 | |
| 337 | status = efi_call_early(locate_handle, |
| 338 | EFI_LOCATE_BY_PROTOCOL, |
| 339 | proto, NULL, &size, gop_handle); |
| 340 | if (status != EFI_SUCCESS) |
| 341 | goto free_handle; |
| 342 | |
| 343 | if (efi_is_64bit()) { |
| 344 | status = setup_gop64(sys_table_arg, si, proto, size, |
| 345 | gop_handle); |
| 346 | } else { |
| 347 | status = setup_gop32(sys_table_arg, si, proto, size, |
| 348 | gop_handle); |
| 349 | } |
| 350 | |
| 351 | free_handle: |
| 352 | efi_call_early(free_pool, gop_handle); |
| 353 | return status; |
| 354 | } |