1 // SPDX-License-Identifier: GPL-2.0 2 /* ----------------------------------------------------------------------- 3 * 4 * Copyright 2011 Intel Corporation; author Matt Fleming 5 * 6 * ----------------------------------------------------------------------- */ 7 8 #include <linux/efi.h> 9 #include <linux/screen_info.h> 10 #include <asm/efi.h> 11 #include <asm/setup.h> 12 13 static void find_bits(unsigned long mask, u8 *pos, u8 *size) 14 { 15 u8 first, len; 16 17 first = 0; 18 len = 0; 19 20 if (mask) { 21 while (!(mask & 0x1)) { 22 mask = mask >> 1; 23 first++; 24 } 25 26 while (mask & 0x1) { 27 mask = mask >> 1; 28 len++; 29 } 30 } 31 32 *pos = first; 33 *size = len; 34 } 35 36 static void 37 setup_pixel_info(struct screen_info *si, u32 pixels_per_scan_line, 38 efi_pixel_bitmask_t pixel_info, int pixel_format) 39 { 40 if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) { 41 si->lfb_depth = 32; 42 si->lfb_linelength = pixels_per_scan_line * 4; 43 si->red_size = 8; 44 si->red_pos = 0; 45 si->green_size = 8; 46 si->green_pos = 8; 47 si->blue_size = 8; 48 si->blue_pos = 16; 49 si->rsvd_size = 8; 50 si->rsvd_pos = 24; 51 } else if (pixel_format == PIXEL_BGR_RESERVED_8BIT_PER_COLOR) { 52 si->lfb_depth = 32; 53 si->lfb_linelength = pixels_per_scan_line * 4; 54 si->red_size = 8; 55 si->red_pos = 16; 56 si->green_size = 8; 57 si->green_pos = 8; 58 si->blue_size = 8; 59 si->blue_pos = 0; 60 si->rsvd_size = 8; 61 si->rsvd_pos = 24; 62 } else if (pixel_format == PIXEL_BIT_MASK) { 63 find_bits(pixel_info.red_mask, &si->red_pos, &si->red_size); 64 find_bits(pixel_info.green_mask, &si->green_pos, 65 &si->green_size); 66 find_bits(pixel_info.blue_mask, &si->blue_pos, &si->blue_size); 67 find_bits(pixel_info.reserved_mask, &si->rsvd_pos, 68 &si->rsvd_size); 69 si->lfb_depth = si->red_size + si->green_size + 70 si->blue_size + si->rsvd_size; 71 si->lfb_linelength = (pixels_per_scan_line * si->lfb_depth) / 8; 72 } else { 73 si->lfb_depth = 4; 74 si->lfb_linelength = si->lfb_width / 2; 75 si->red_size = 0; 76 si->red_pos = 0; 77 si->green_size = 0; 78 si->green_pos = 0; 79 si->blue_size = 0; 80 si->blue_pos = 0; 81 si->rsvd_size = 0; 82 si->rsvd_pos = 0; 83 } 84 } 85 86 #define efi_gop_attr(table, attr, instance) \ 87 (efi_table_attr(efi_graphics_output_protocol##table, attr, instance)) 88 89 static efi_status_t 90 setup_gop(efi_system_table_t *sys_table_arg, struct screen_info *si, 91 efi_guid_t *proto, unsigned long size, void **handles) 92 { 93 efi_graphics_output_protocol_t *gop, *first_gop; 94 unsigned long nr_gops; 95 u16 width, height; 96 u32 pixels_per_scan_line; 97 u32 ext_lfb_base; 98 efi_physical_addr_t fb_base; 99 efi_pixel_bitmask_t pixel_info; 100 int pixel_format; 101 efi_status_t status; 102 int i; 103 bool is64 = efi_is_64bit(); 104 105 first_gop = NULL; 106 gop = NULL; 107 108 nr_gops = size / (is64 ? sizeof(u64) : sizeof(u32)); 109 for (i = 0; i < nr_gops; i++) { 110 efi_graphics_output_protocol_mode_t *mode; 111 efi_graphics_output_mode_info_t *info = NULL; 112 efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID; 113 bool conout_found = false; 114 void *dummy = NULL; 115 efi_handle_t h = (efi_handle_t)(unsigned long) 116 (is64 ? ((u64 *)handles)[i] 117 : ((u32 *)handles)[i]); 118 efi_physical_addr_t current_fb_base; 119 120 status = efi_call_early(handle_protocol, h, 121 proto, (void **)&gop); 122 if (status != EFI_SUCCESS) 123 continue; 124 125 status = efi_call_early(handle_protocol, h, 126 &conout_proto, &dummy); 127 if (status == EFI_SUCCESS) 128 conout_found = true; 129 130 mode = (void *)(unsigned long)efi_gop_attr(, mode, gop); 131 info = (void *)(unsigned long)efi_gop_attr(_mode, info, mode); 132 current_fb_base = efi_gop_attr(_mode, frame_buffer_base, mode); 133 134 if ((!first_gop || conout_found) && 135 info->pixel_format != PIXEL_BLT_ONLY) { 136 /* 137 * Systems that use the UEFI Console Splitter may 138 * provide multiple GOP devices, not all of which are 139 * backed by real hardware. The workaround is to search 140 * for a GOP implementing the ConOut protocol, and if 141 * one isn't found, to just fall back to the first GOP. 142 */ 143 width = info->horizontal_resolution; 144 height = info->vertical_resolution; 145 pixel_format = info->pixel_format; 146 pixel_info = info->pixel_information; 147 pixels_per_scan_line = info->pixels_per_scan_line; 148 fb_base = current_fb_base; 149 150 /* 151 * Once we've found a GOP supporting ConOut, 152 * don't bother looking any further. 153 */ 154 first_gop = gop; 155 if (conout_found) 156 break; 157 } 158 } 159 160 /* Did we find any GOPs? */ 161 if (!first_gop) 162 return EFI_NOT_FOUND; 163 164 /* EFI framebuffer */ 165 si->orig_video_isVGA = VIDEO_TYPE_EFI; 166 167 si->lfb_width = width; 168 si->lfb_height = height; 169 si->lfb_base = fb_base; 170 171 ext_lfb_base = (u64)(unsigned long)fb_base >> 32; 172 if (ext_lfb_base) { 173 si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE; 174 si->ext_lfb_base = ext_lfb_base; 175 } 176 177 si->pages = 1; 178 179 setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format); 180 181 si->lfb_size = si->lfb_linelength * si->lfb_height; 182 183 si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS; 184 185 return EFI_SUCCESS; 186 } 187 188 /* 189 * See if we have Graphics Output Protocol 190 */ 191 efi_status_t efi_setup_gop(efi_system_table_t *sys_table_arg, 192 struct screen_info *si, efi_guid_t *proto, 193 unsigned long size) 194 { 195 efi_status_t status; 196 void **gop_handle = NULL; 197 198 status = efi_call_early(allocate_pool, EFI_LOADER_DATA, 199 size, (void **)&gop_handle); 200 if (status != EFI_SUCCESS) 201 return status; 202 203 status = efi_call_early(locate_handle, 204 EFI_LOCATE_BY_PROTOCOL, 205 proto, NULL, &size, gop_handle); 206 if (status != EFI_SUCCESS) 207 goto free_handle; 208 209 status = setup_gop(sys_table_arg, si, proto, size, gop_handle); 210 211 free_handle: 212 efi_call_early(free_pool, gop_handle); 213 return status; 214 } 215