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 #include "efistub.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 efi_pixel_bitmask_t 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 #define efi_gop_attr(table, attr, instance) \ 89 (efi_table_attr(efi_graphics_output_protocol##table, attr, instance)) 90 91 static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto, 92 unsigned long size, void **handles) 93 { 94 efi_graphics_output_protocol_t *gop, *first_gop; 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 efi_handle_t h; 103 int i; 104 105 first_gop = NULL; 106 gop = NULL; 107 108 for_each_efi_handle(h, handles, size, i) { 109 efi_graphics_output_protocol_mode_t *mode; 110 efi_graphics_output_mode_info_t *info = NULL; 111 efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID; 112 bool conout_found = false; 113 void *dummy = NULL; 114 efi_physical_addr_t current_fb_base; 115 116 status = efi_call_early(handle_protocol, h, 117 proto, (void **)&gop); 118 if (status != EFI_SUCCESS) 119 continue; 120 121 status = efi_call_early(handle_protocol, h, 122 &conout_proto, &dummy); 123 if (status == EFI_SUCCESS) 124 conout_found = true; 125 126 mode = (void *)(unsigned long)efi_gop_attr(, mode, gop); 127 info = (void *)(unsigned long)efi_gop_attr(_mode, info, mode); 128 current_fb_base = efi_gop_attr(_mode, frame_buffer_base, mode); 129 130 if ((!first_gop || conout_found) && 131 info->pixel_format != PIXEL_BLT_ONLY) { 132 /* 133 * Systems that use the UEFI Console Splitter may 134 * provide multiple GOP devices, not all of which are 135 * backed by real hardware. The workaround is to search 136 * for a GOP implementing the ConOut protocol, and if 137 * one isn't found, to just fall back to the first GOP. 138 */ 139 width = info->horizontal_resolution; 140 height = info->vertical_resolution; 141 pixel_format = info->pixel_format; 142 pixel_info = info->pixel_information; 143 pixels_per_scan_line = info->pixels_per_scan_line; 144 fb_base = current_fb_base; 145 146 /* 147 * Once we've found a GOP supporting ConOut, 148 * don't bother looking any further. 149 */ 150 first_gop = gop; 151 if (conout_found) 152 break; 153 } 154 } 155 156 /* Did we find any GOPs? */ 157 if (!first_gop) 158 return EFI_NOT_FOUND; 159 160 /* EFI framebuffer */ 161 si->orig_video_isVGA = VIDEO_TYPE_EFI; 162 163 si->lfb_width = width; 164 si->lfb_height = height; 165 si->lfb_base = fb_base; 166 167 ext_lfb_base = (u64)(unsigned long)fb_base >> 32; 168 if (ext_lfb_base) { 169 si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE; 170 si->ext_lfb_base = ext_lfb_base; 171 } 172 173 si->pages = 1; 174 175 setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format); 176 177 si->lfb_size = si->lfb_linelength * si->lfb_height; 178 179 si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS; 180 181 return EFI_SUCCESS; 182 } 183 184 /* 185 * See if we have Graphics Output Protocol 186 */ 187 efi_status_t efi_setup_gop(struct screen_info *si, efi_guid_t *proto, 188 unsigned long size) 189 { 190 efi_status_t status; 191 void **gop_handle = NULL; 192 193 status = efi_call_early(allocate_pool, EFI_LOADER_DATA, 194 size, (void **)&gop_handle); 195 if (status != EFI_SUCCESS) 196 return status; 197 198 status = efi_call_early(locate_handle, 199 EFI_LOCATE_BY_PROTOCOL, 200 proto, NULL, &size, gop_handle); 201 if (status != EFI_SUCCESS) 202 goto free_handle; 203 204 status = setup_gop(si, proto, size, gop_handle); 205 206 free_handle: 207 efi_call_early(free_pool, gop_handle); 208 return status; 209 } 210