19  *   AGPT, allow override with 'gpt' kernel command line option.
40  * - moved le_efi_guid_to_cpus() back into this file.  GPT is the only
42  * - Changed gpt structure names and members to be simpler and more Linux-like.
64  * - Added kernel command line option 'gpt' to override valid PMBR test.
93 /* This allows a kernel command line option 'gpt' to override
104 __setup("gpt", force_gpt_fn);
145 	/* set to 0x00000001 (i.e., the LBA of the GPT Partition Header) */  in pmbr_part_valid()
167  * marked out by up to three GPT partitions.
217 			pr_debug("GPT: mbr size in lba (%u) different than whole disk (%u).\n",  in is_pmbr_valid()
265  * @gpt: GPT header
268  * Allocates space for PTEs based on information found in @gpt.
272 					 gpt_header *gpt)  in alloc_read_gpt_entries()  argument
277 	if (!gpt)  in alloc_read_gpt_entries()
280 	count = (size_t)le32_to_cpu(gpt->num_partition_entries) *  in alloc_read_gpt_entries()
281                 le32_to_cpu(gpt->sizeof_partition_entry);  in alloc_read_gpt_entries()
288 	if (read_lba(state, le64_to_cpu(gpt->partition_entry_lba),  in alloc_read_gpt_entries()
298  * alloc_read_gpt_header(): Allocates GPT header, reads into it from disk
302  * Description: returns GPT header on success, NULL on error.   Allocates
303  * and fills a GPT header starting at @ from @state->disk.
304  * Note: remember to free gpt when finished with it.
309 	gpt_header *gpt;  in alloc_read_gpt_header()  local
312 	gpt = kmalloc(ssz, GFP_KERNEL);  in alloc_read_gpt_header()
313 	if (!gpt)  in alloc_read_gpt_header()
316 	if (read_lba(state, lba, (u8 *) gpt, ssz) < ssz) {  in alloc_read_gpt_header()
317 		kfree(gpt);  in alloc_read_gpt_header()
318                 gpt=NULL;  in alloc_read_gpt_header()
322 	return gpt;  in alloc_read_gpt_header()
326  * is_gpt_valid() - tests one GPT header and PTEs for validity
328  * @lba: logical block address of the GPT header to test
329  * @gpt: GPT header ptr, filled on return.
333  * If valid, returns pointers to newly allocated GPT header and PTEs.
336 			gpt_header **gpt, gpt_entry **ptes)  in is_gpt_valid()  argument
343 	if (!(*gpt = alloc_read_gpt_header(state, lba)))  in is_gpt_valid()
347 	if (le64_to_cpu((*gpt)->signature) != GPT_HEADER_SIGNATURE) {  in is_gpt_valid()
350 			 (unsigned long long)le64_to_cpu((*gpt)->signature),  in is_gpt_valid()
356 	if (le32_to_cpu((*gpt)->header_size) >  in is_gpt_valid()
359 			le32_to_cpu((*gpt)->header_size),  in is_gpt_valid()
365 	if (le32_to_cpu((*gpt)->header_size) < sizeof(gpt_header)) {  in is_gpt_valid()
367 			le32_to_cpu((*gpt)->header_size),  in is_gpt_valid()
373 	origcrc = le32_to_cpu((*gpt)->header_crc32);  in is_gpt_valid()
374 	(*gpt)->header_crc32 = 0;  in is_gpt_valid()
375 	crc = efi_crc32((const unsigned char *) (*gpt), le32_to_cpu((*gpt)->header_size));  in is_gpt_valid()
382 	(*gpt)->header_crc32 = cpu_to_le32(origcrc);  in is_gpt_valid()
386 	if (le64_to_cpu((*gpt)->my_lba) != lba) {  in is_gpt_valid()
387 		pr_debug("GPT my_lba incorrect: %lld != %lld\n",  in is_gpt_valid()
388 			 (unsigned long long)le64_to_cpu((*gpt)->my_lba),  in is_gpt_valid()
397 	if (le64_to_cpu((*gpt)->first_usable_lba) > lastlba) {  in is_gpt_valid()
398 		pr_debug("GPT: first_usable_lba incorrect: %lld > %lld\n",  in is_gpt_valid()
399 			 (unsigned long long)le64_to_cpu((*gpt)->first_usable_lba),  in is_gpt_valid()
403 	if (le64_to_cpu((*gpt)->last_usable_lba) > lastlba) {  in is_gpt_valid()
404 		pr_debug("GPT: last_usable_lba incorrect: %lld > %lld\n",  in is_gpt_valid()
405 			 (unsigned long long)le64_to_cpu((*gpt)->last_usable_lba),  in is_gpt_valid()
409 	if (le64_to_cpu((*gpt)->last_usable_lba) < le64_to_cpu((*gpt)->first_usable_lba)) {  in is_gpt_valid()
410 		pr_debug("GPT: last_usable_lba incorrect: %lld > %lld\n",  in is_gpt_valid()
411 			 (unsigned long long)le64_to_cpu((*gpt)->last_usable_lba),  in is_gpt_valid()
412 			 (unsigned long long)le64_to_cpu((*gpt)->first_usable_lba));  in is_gpt_valid()
416 	if (le32_to_cpu((*gpt)->sizeof_partition_entry) != sizeof(gpt_entry)) {  in is_gpt_valid()
422 	pt_size = (u64)le32_to_cpu((*gpt)->num_partition_entries) *  in is_gpt_valid()
423 		le32_to_cpu((*gpt)->sizeof_partition_entry);  in is_gpt_valid()
430 	if (!(*ptes = alloc_read_gpt_entries(state, *gpt)))  in is_gpt_valid()
436 	if (crc != le32_to_cpu((*gpt)->partition_entry_array_crc32)) {  in is_gpt_valid()
448 	kfree(*gpt);  in is_gpt_valid()
449 	*gpt = NULL;  in is_gpt_valid()
471  * compare_gpts() - Search disk for valid GPT headers and PTEs
472  * @pgpt: primary GPT header
473  * @agpt: alternate GPT header
487 		pr_warn("GPT:Primary header LBA != Alt. header alternate_lba\n");  in compare_gpts()
488 		pr_warn("GPT:%lld != %lld\n",  in compare_gpts()
494 		pr_warn("GPT:Primary header alternate_lba != Alt. header my_lba\n");  in compare_gpts()
495 		pr_warn("GPT:%lld != %lld\n",  in compare_gpts()
502 		pr_warn("GPT:first_usable_lbas don't match.\n");  in compare_gpts()
503 		pr_warn("GPT:%lld != %lld\n",  in compare_gpts()
510 		pr_warn("GPT:last_usable_lbas don't match.\n");  in compare_gpts()
511 		pr_warn("GPT:%lld != %lld\n",  in compare_gpts()
517 		pr_warn("GPT:disk_guids don't match.\n");  in compare_gpts()
522 		pr_warn("GPT:num_partition_entries don't match: "  in compare_gpts()
530 		pr_warn("GPT:sizeof_partition_entry values don't match: "  in compare_gpts()
538 		pr_warn("GPT:partition_entry_array_crc32 values don't match: "  in compare_gpts()
545 		pr_warn("GPT:Primary header thinks Alt. header is not at the end of the disk.\n");  in compare_gpts()
546 		pr_warn("GPT:%lld != %lld\n",  in compare_gpts()
553 		pr_warn("GPT:Alternate GPT header not at the end of the disk.\n");  in compare_gpts()
554 		pr_warn("GPT:%lld != %lld\n",  in compare_gpts()
561 		pr_warn("GPT: Use GNU Parted to correct GPT errors.\n");  in compare_gpts()
566  * find_valid_gpt() - Search disk for valid GPT headers and PTEs
568  * @gpt: GPT header ptr, filled on return.
572  * If valid, returns pointers to newly allocated GPT header and PTEs.
574  * 'gpt' kernel command line option) and finding either the Primary
575  * GPT header and PTEs valid, or the Alternate GPT header and PTEs
576  * valid.  If the Primary GPT header is not valid, the Alternate GPT header
577  * is not checked unless the 'gpt' kernel command line option is passed.
579  * the user to decide to use the Alternate GPT.
581 static int find_valid_gpt(struct parsed_partitions *state, gpt_header **gpt,  in find_valid_gpt()  argument
642                 *gpt  = pgpt;  in find_valid_gpt()
647                         pr_warn("Alternate GPT is invalid, using primary GPT.\n");  in find_valid_gpt()
651                 *gpt  = agpt;  in find_valid_gpt()
655 		pr_warn("Primary GPT is invalid, using alternate GPT.\n");  in find_valid_gpt()
664         *gpt = NULL;  in find_valid_gpt()
695  * efi_partition - scan for GPT partitions
698  * Description: called from check.c, if the disk contains GPT
705  * We do not create a Linux partition for GPT, but
715 	gpt_header *gpt = NULL;  in efi_partition()  local
720 	if (!find_valid_gpt(state, &gpt, &ptes) || !gpt || !ptes) {  in efi_partition()
721 		kfree(gpt);  in efi_partition()
728 	for (i = 0; i < le32_to_cpu(gpt->num_partition_entries) && i < state->limit-1; i++) {  in efi_partition()
754 	kfree(gpt);  in efi_partition()