1 // SPDX-License-Identifier: GPL-2.0-only
45  * 			yyyy=4 digit year, mm=1-12, dd=1-31.
54  * @rsvd_next_header:	32-bit pointer to the next Secure Boot Module in the
60 …rom https://downloadcenter.intel.com/download/23197/Intel-Quark-SoC-X1000-Board-Support-Package-BSP
138 	if (remaining_size - size < EFI_MIN_RESERVE)  in query_variable_store_nonblocking()
173 	if ((remaining_size - size < EFI_MIN_RESERVE) &&  in efi_query_variable_store()
217 		if (remaining_size - size < EFI_MIN_RESERVE)  in efi_query_variable_store()
235  * However, some boot services regions contain data that is required
237  * freed. This is done by tagging those regions with the
242  * into efi.memmap (splitting existing regions if necessary) and tag
269 	mr.range.end = addr + size - 1;  in efi_arch_mem_reserve()
296  * can free regions in efi_free_boot_services().
298  * Use this function to ensure we do not free regions owned by somebody
299  * else. We must only reserve (and then free) regions:
301  * - Not within any part of the kernel
302  * - Not the BIOS reserved area (E820_TYPE_RESERVED, E820_TYPE_NVS, etc)
323 		u64 start = md->phys_addr;  in efi_reserve_boot_services()
324 		u64 size = md->num_pages << EFI_PAGE_SHIFT;  in efi_reserve_boot_services()
327 		if (md->type != EFI_BOOT_SERVICES_CODE &&  in efi_reserve_boot_services()
328 		    md->type != EFI_BOOT_SERVICES_DATA)  in efi_reserve_boot_services()
338 		 * critical regions of memory (like the kernel image) or  in efi_reserve_boot_services()
339 		 * those regions that somebody else has already  in efi_reserve_boot_services()
365 		 * those regions that must not be paired with  in efi_reserve_boot_services()
368 		md->attribute |= EFI_MEMORY_RUNTIME;  in efi_reserve_boot_services()
373  * Apart from having VA mappings for EFI boot services code/data regions,
380 	u64 pa = md->phys_addr;  in efi_unmap_pages()
381 	u64 va = md->virt_addr;  in efi_unmap_pages()
386 	 * regions.  in efi_unmap_pages()
391 	if (kernel_unmap_pages_in_pgd(pgd, pa, md->num_pages))  in efi_unmap_pages()
394 	if (kernel_unmap_pages_in_pgd(pgd, va, md->num_pages))  in efi_unmap_pages()
405 	/* Keep all regions for /sys/kernel/debug/efi */  in efi_free_boot_services()
410 		unsigned long long start = md->phys_addr;  in efi_free_boot_services()
411 		unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;  in efi_free_boot_services()
414 		if (md->type != EFI_BOOT_SERVICES_CODE &&  in efi_free_boot_services()
415 		    md->type != EFI_BOOT_SERVICES_DATA) {  in efi_free_boot_services()
421 		if (md->attribute & EFI_MEMORY_RUNTIME) {  in efi_free_boot_services()
428 		 * code/data regions were mapped as a quirk for buggy firmware.  in efi_free_boot_services()
434 		 * Nasty quirk: if all sub-1MB memory is used for boot  in efi_free_boot_services()
442 		 * grub2-efi on a hard disk.  (And no, I don't know why  in efi_free_boot_services()
450 			size -= rm_size;  in efi_free_boot_services()
455 		 * - BIOS might clobber it  in efi_free_boot_services()
456 		 * - Crash kernel needs it to be reserved  in efi_free_boot_services()
461 			size -= (SZ_1M - start);  in efi_free_boot_services()
484 	 * regions that are not tagged EFI_MEMORY_RUNTIME, since those  in efi_free_boot_services()
485 	 * regions have now been freed.  in efi_free_boot_services()
489 		if (!(md->attribute & EFI_MEMORY_RUNTIME) &&  in efi_free_boot_services()
490 		    (md->type == EFI_BOOT_SERVICES_CODE ||  in efi_free_boot_services()
491 		     md->type == EFI_BOOT_SERVICES_DATA))  in efi_free_boot_services()
532 		ret = -ENOMEM;  in efi_reuse_config()
536 	if (!data->smbios)  in efi_reuse_config()
544 		ret = -ENOMEM;  in efi_reuse_config()
551 		guid = ((efi_config_table_64_t *)p)->guid;  in efi_reuse_config()
554 			((efi_config_table_64_t *)p)->table = data->smbios;  in efi_reuse_config()
573 		pr_info("Setup done, disabling due to 32/64-bit mismatch\n");  in efi_apply_memmap_quirks()
611 	if (csh->csh_signature != QUARK_CSH_SIGNATURE ||  in qrk_capsule_setup_info()
612 	    csh->headersize != QUARK_SECURITY_HEADER_SIZE)  in qrk_capsule_setup_info()
622 	if (csh->rsvd_next_header != 0) {  in qrk_capsule_setup_info()
624 		return -EINVAL;  in qrk_capsule_setup_info()
627 	*pkbuff += csh->headersize;  in qrk_capsule_setup_info()
628 	cap_info->total_size = csh->headersize;  in qrk_capsule_setup_info()
633 	cap_info->phys[0] += csh->headersize;  in qrk_capsule_setup_info()
636 	 * cap_info->capsule should point at a virtual mapping of the entire  in qrk_capsule_setup_info()
641 	 * virtual mapping, let's just point cap_info->capsule at our copy  in qrk_capsule_setup_info()
644 	cap_info->capsule = &cap_info->header;  in qrk_capsule_setup_info()
665 	cap_info->total_size = 0;  in efi_capsule_setup_info()
671 		 *  - a value > 0 if the setup should continue, after advancing  in efi_capsule_setup_info()
673 		 *  - 0 if not enough hdr_bytes are available yet  in efi_capsule_setup_info()
674 		 *  - a negative error code otherwise  in efi_capsule_setup_info()
676 		quirk_handler = (typeof(quirk_handler))id->driver_data;  in efi_capsule_setup_info()
682 	memcpy(&cap_info->header, kbuff, sizeof(cap_info->header));  in efi_capsule_setup_info()
684 	cap_info->total_size += cap_info->header.imagesize;  in efi_capsule_setup_info()
724 	 * Address range 0x0000 - 0x0fff is always mapped in the efi_pgd, so  in efi_crash_gracefully_on_page_fault()