1 /* 2 * EFI device path interface 3 * 4 * Copyright (c) 2017 Heinrich Schuchardt 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 #include <common.h> 10 #include <efi_loader.h> 11 12 #define MAC_OUTPUT_LEN 22 13 #define UNKNOWN_OUTPUT_LEN 23 14 15 const efi_guid_t efi_guid_device_path_to_text_protocol = 16 EFI_DEVICE_PATH_TO_TEXT_PROTOCOL_GUID; 17 18 static char *dp_unknown(char *s, struct efi_device_path *dp) 19 { 20 s += sprintf(s, "/UNKNOWN(%04x,%04x)", dp->type, dp->sub_type); 21 return s; 22 } 23 24 static char *dp_hardware(char *s, struct efi_device_path *dp) 25 { 26 switch (dp->sub_type) { 27 case DEVICE_PATH_SUB_TYPE_MEMORY: { 28 struct efi_device_path_memory *mdp = 29 (struct efi_device_path_memory *)dp; 30 s += sprintf(s, "/MemoryMapped(0x%x,0x%llx,0x%llx)", 31 mdp->memory_type, 32 mdp->start_address, 33 mdp->end_address); 34 break; 35 } 36 case DEVICE_PATH_SUB_TYPE_VENDOR: { 37 struct efi_device_path_vendor *vdp = 38 (struct efi_device_path_vendor *)dp; 39 s += sprintf(s, "/VenHw(%pUl)", &vdp->guid); 40 break; 41 } 42 default: 43 s = dp_unknown(s, dp); 44 break; 45 } 46 return s; 47 } 48 49 static char *dp_acpi(char *s, struct efi_device_path *dp) 50 { 51 switch (dp->sub_type) { 52 case DEVICE_PATH_SUB_TYPE_ACPI_DEVICE: { 53 struct efi_device_path_acpi_path *adp = 54 (struct efi_device_path_acpi_path *)dp; 55 s += sprintf(s, "/Acpi(PNP%04x", EISA_PNP_NUM(adp->hid)); 56 if (adp->uid) 57 s += sprintf(s, ",%d", adp->uid); 58 s += sprintf(s, ")"); 59 break; 60 } 61 default: 62 s = dp_unknown(s, dp); 63 break; 64 } 65 return s; 66 } 67 68 static char *dp_msging(char *s, struct efi_device_path *dp) 69 { 70 switch (dp->sub_type) { 71 case DEVICE_PATH_SUB_TYPE_MSG_USB: { 72 struct efi_device_path_usb *udp = 73 (struct efi_device_path_usb *)dp; 74 s += sprintf(s, "/Usb(0x%x,0x%x)", udp->parent_port_number, 75 udp->usb_interface); 76 break; 77 } 78 case DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR: { 79 struct efi_device_path_mac_addr *mdp = 80 (struct efi_device_path_mac_addr *)dp; 81 82 if (mdp->if_type != 0 && mdp->if_type != 1) 83 break; 84 85 s += sprintf(s, "/MAC(%02x%02x%02x%02x%02x%02x,0x%1x)", 86 mdp->mac.addr[0], mdp->mac.addr[1], 87 mdp->mac.addr[2], mdp->mac.addr[3], 88 mdp->mac.addr[4], mdp->mac.addr[5], 89 mdp->if_type); 90 91 break; 92 } 93 case DEVICE_PATH_SUB_TYPE_MSG_USB_CLASS: { 94 struct efi_device_path_usb_class *ucdp = 95 (struct efi_device_path_usb_class *)dp; 96 97 s += sprintf(s, "/USBClass(%x,%x,%x,%x,%x)", 98 ucdp->vendor_id, ucdp->product_id, 99 ucdp->device_class, ucdp->device_subclass, 100 ucdp->device_protocol); 101 102 break; 103 } 104 case DEVICE_PATH_SUB_TYPE_MSG_SD: 105 case DEVICE_PATH_SUB_TYPE_MSG_MMC: { 106 const char *typename = 107 (dp->sub_type == DEVICE_PATH_SUB_TYPE_MSG_SD) ? 108 "SDCard" : "MMC"; 109 struct efi_device_path_sd_mmc_path *sddp = 110 (struct efi_device_path_sd_mmc_path *)dp; 111 s += sprintf(s, "/%s(Slot%u)", typename, sddp->slot_number); 112 break; 113 } 114 default: 115 s = dp_unknown(s, dp); 116 break; 117 } 118 return s; 119 } 120 121 static char *dp_media(char *s, struct efi_device_path *dp) 122 { 123 switch (dp->sub_type) { 124 case DEVICE_PATH_SUB_TYPE_HARD_DRIVE_PATH: { 125 struct efi_device_path_hard_drive_path *hddp = 126 (struct efi_device_path_hard_drive_path *)dp; 127 void *sig = hddp->partition_signature; 128 129 switch (hddp->signature_type) { 130 case SIG_TYPE_MBR: 131 s += sprintf(s, "/HD(Part%d,Sig%08x)", 132 hddp->partition_number, 133 *(uint32_t *)sig); 134 break; 135 case SIG_TYPE_GUID: 136 s += sprintf(s, "/HD(Part%d,Sig%pUl)", 137 hddp->partition_number, sig); 138 default: 139 s += sprintf(s, "/HD(Part%d,MBRType=%02x,SigType=%02x)", 140 hddp->partition_number, hddp->partmap_type, 141 hddp->signature_type); 142 } 143 144 break; 145 } 146 case DEVICE_PATH_SUB_TYPE_CDROM_PATH: { 147 struct efi_device_path_cdrom_path *cddp = 148 (struct efi_device_path_cdrom_path *)dp; 149 s += sprintf(s, "/CDROM(0x%x)", cddp->boot_entry); 150 break; 151 } 152 case DEVICE_PATH_SUB_TYPE_FILE_PATH: { 153 struct efi_device_path_file_path *fp = 154 (struct efi_device_path_file_path *)dp; 155 int slen = (dp->length - sizeof(*dp)) / 2; 156 s += sprintf(s, "/%-*ls", slen, fp->str); 157 break; 158 } 159 default: 160 s = dp_unknown(s, dp); 161 break; 162 } 163 return s; 164 } 165 166 static uint16_t *efi_convert_device_node_to_text( 167 struct efi_device_path *dp, 168 bool display_only, 169 bool allow_shortcuts) 170 { 171 unsigned long len; 172 efi_status_t r; 173 char buf[512]; /* this ought be be big enough for worst case */ 174 char *str = buf; 175 uint16_t *out; 176 177 while (dp) { 178 switch (dp->type) { 179 case DEVICE_PATH_TYPE_HARDWARE_DEVICE: 180 str = dp_hardware(str, dp); 181 break; 182 case DEVICE_PATH_TYPE_ACPI_DEVICE: 183 str = dp_acpi(str, dp); 184 break; 185 case DEVICE_PATH_TYPE_MESSAGING_DEVICE: 186 str = dp_msging(str, dp); 187 break; 188 case DEVICE_PATH_TYPE_MEDIA_DEVICE: 189 str = dp_media(str, dp); 190 break; 191 default: 192 str = dp_unknown(str, dp); 193 } 194 195 dp = efi_dp_next(dp); 196 } 197 198 *str++ = '\0'; 199 200 len = str - buf; 201 r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, 2 * len, (void **)&out); 202 if (r != EFI_SUCCESS) 203 return NULL; 204 205 ascii2unicode(out, buf); 206 out[len - 1] = 0; 207 208 return out; 209 } 210 211 /* helper for debug prints.. efi_free_pool() the result. */ 212 uint16_t *efi_dp_str(struct efi_device_path *dp) 213 { 214 return efi_convert_device_node_to_text(dp, true, true); 215 } 216 217 218 static uint16_t EFIAPI *efi_convert_device_node_to_text_ext( 219 struct efi_device_path *device_node, 220 bool display_only, 221 bool allow_shortcuts) 222 { 223 uint16_t *buffer; 224 225 EFI_ENTRY("%p, %d, %d", device_node, display_only, allow_shortcuts); 226 227 buffer = efi_convert_device_node_to_text(device_node, display_only, 228 allow_shortcuts); 229 230 EFI_EXIT(EFI_SUCCESS); 231 return buffer; 232 } 233 234 static uint16_t EFIAPI *efi_convert_device_path_to_text( 235 struct efi_device_path *device_path, 236 bool display_only, 237 bool allow_shortcuts) 238 { 239 uint16_t *buffer; 240 241 EFI_ENTRY("%p, %d, %d", device_path, display_only, allow_shortcuts); 242 243 /* 244 * Our device paths are all of depth one. So its is sufficient to 245 * to convert the first node. 246 */ 247 buffer = efi_convert_device_node_to_text(device_path, display_only, 248 allow_shortcuts); 249 250 EFI_EXIT(EFI_SUCCESS); 251 return buffer; 252 } 253 254 const struct efi_device_path_to_text_protocol efi_device_path_to_text = { 255 .convert_device_node_to_text = efi_convert_device_node_to_text_ext, 256 .convert_device_path_to_text = efi_convert_device_path_to_text, 257 }; 258