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 static efi_graphics_output_protocol_t * 89 find_gop(efi_guid_t *proto, unsigned long size, void **handles) 90 { 91 efi_graphics_output_protocol_t *gop, *first_gop; 92 efi_graphics_output_protocol_mode_t *mode; 93 efi_graphics_output_mode_info_t *info = NULL; 94 efi_status_t status; 95 efi_handle_t h; 96 int i; 97 98 first_gop = NULL; 99 100 for_each_efi_handle(h, handles, size, i) { 101 efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID; 102 void *dummy = NULL; 103 104 status = efi_bs_call(handle_protocol, h, proto, (void **)&gop); 105 if (status != EFI_SUCCESS) 106 continue; 107 108 mode = efi_table_attr(gop, mode); 109 info = efi_table_attr(mode, info); 110 if (info->pixel_format == PIXEL_BLT_ONLY) 111 continue; 112 113 /* 114 * Systems that use the UEFI Console Splitter may 115 * provide multiple GOP devices, not all of which are 116 * backed by real hardware. The workaround is to search 117 * for a GOP implementing the ConOut protocol, and if 118 * one isn't found, to just fall back to the first GOP. 119 * 120 * Once we've found a GOP supporting ConOut, 121 * don't bother looking any further. 122 */ 123 status = efi_bs_call(handle_protocol, h, &conout_proto, &dummy); 124 if (status == EFI_SUCCESS) 125 return gop; 126 127 if (!first_gop) 128 first_gop = gop; 129 } 130 131 return first_gop; 132 } 133 134 static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto, 135 unsigned long size, void **handles) 136 { 137 efi_graphics_output_protocol_t *gop; 138 efi_graphics_output_protocol_mode_t *mode; 139 efi_graphics_output_mode_info_t *info = NULL; 140 efi_physical_addr_t fb_base; 141 142 gop = find_gop(proto, size, handles); 143 144 /* Did we find any GOPs? */ 145 if (!gop) 146 return EFI_NOT_FOUND; 147 148 /* EFI framebuffer */ 149 mode = efi_table_attr(gop, mode); 150 info = efi_table_attr(mode, info); 151 152 si->orig_video_isVGA = VIDEO_TYPE_EFI; 153 154 si->lfb_width = info->horizontal_resolution; 155 si->lfb_height = info->vertical_resolution; 156 157 fb_base = efi_table_attr(mode, frame_buffer_base); 158 si->lfb_base = fb_base; 159 si->ext_lfb_base = (u64)(unsigned long)fb_base >> 32; 160 if (si->ext_lfb_base) 161 si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE; 162 163 si->pages = 1; 164 165 setup_pixel_info(si, info->pixels_per_scan_line, 166 info->pixel_information, info->pixel_format); 167 168 si->lfb_size = si->lfb_linelength * si->lfb_height; 169 170 si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS; 171 172 return EFI_SUCCESS; 173 } 174 175 /* 176 * See if we have Graphics Output Protocol 177 */ 178 efi_status_t efi_setup_gop(struct screen_info *si, efi_guid_t *proto, 179 unsigned long size) 180 { 181 efi_status_t status; 182 void **gop_handle = NULL; 183 184 status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size, 185 (void **)&gop_handle); 186 if (status != EFI_SUCCESS) 187 return status; 188 189 status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL, proto, NULL, 190 &size, gop_handle); 191 if (status != EFI_SUCCESS) 192 goto free_handle; 193 194 status = setup_gop(si, proto, size, gop_handle); 195 196 free_handle: 197 efi_bs_call(free_pool, gop_handle); 198 return status; 199 } 200