1 // SPDX-License-Identifier: GPL-2.0-only
27  * bootargs, kaslr-seed, rng-seed, useable-memory-range and elfcorehdr.
32  * fdt_find_and_del_mem_rsv - delete memory reservation with given address and size
50 			return -EINVAL;  in fdt_find_and_del_mem_rsv()
57 				return -EINVAL;  in fdt_find_and_del_mem_rsv()
64 	return -ENOENT;  in fdt_find_and_del_mem_rsv()
68  * get_addr_size_cells - Get address and size of root node
81 		return -EINVAL;  in get_addr_size_cells()
92  * do_get_kexec_buffer - Get address and size of device tree property
111 		return -ENOENT;  in do_get_kexec_buffer()
121  * ima_get_kexec_buffer - get IMA buffer from the previous kernel
135 	prop = of_get_property(of_chosen, "linux,ima-kexec-buffer", &len);  in ima_get_kexec_buffer()
137 		return -ENOENT;  in ima_get_kexec_buffer()
143 	/* Do some sanity on the returned size for the ima-kexec buffer */  in ima_get_kexec_buffer()
145 		return -ENOENT;  in ima_get_kexec_buffer()
152 	end_pfn = PHYS_PFN(tmp_addr + tmp_size - 1);  in ima_get_kexec_buffer()
156 		return -EINVAL;  in ima_get_kexec_buffer()
166  * ima_free_kexec_buffer - free memory used by the IMA buffer
175 	prop = of_find_property(of_chosen, "linux,ima-kexec-buffer", NULL);  in ima_free_kexec_buffer()
177 		return -ENOENT;  in ima_free_kexec_buffer()
179 	ret = do_get_kexec_buffer(prop->value, prop->length, &addr, &size);  in ima_free_kexec_buffer()
192  * remove_ima_buffer - remove the IMA buffer property and reservation from @fdt
210 	prop = fdt_getprop(fdt, chosen_node, "linux,ima-kexec-buffer", &len);  in remove_ima_buffer()
215 	fdt_delprop(fdt, chosen_node, "linux,ima-kexec-buffer");  in remove_ima_buffer()
226  * setup_ima_buffer - add IMA buffer information to the fdt
238 	if (!image->ima_buffer_size)  in setup_ima_buffer()
242 				       "linux,ima-kexec-buffer",  in setup_ima_buffer()
243 				       image->ima_buffer_addr,  in setup_ima_buffer()
244 				       image->ima_buffer_size);  in setup_ima_buffer()
246 		return -EINVAL;  in setup_ima_buffer()
248 	ret = fdt_add_mem_rsv(fdt, image->ima_buffer_addr,  in setup_ima_buffer()
249 			      image->ima_buffer_size);  in setup_ima_buffer()
251 		return -EINVAL;  in setup_ima_buffer()
254 		 image->ima_buffer_addr, image->ima_buffer_size);  in setup_ima_buffer()
267  * of_kexec_alloc_and_setup_fdt - Alloc and setup a new Flattened Device Tree
305 	if (ret == -EINVAL) {  in of_kexec_alloc_and_setup_fdt()
311 	if (chosen_node == -FDT_ERR_NOTFOUND)  in of_kexec_alloc_and_setup_fdt()
320 	if (ret && ret != -FDT_ERR_NOTFOUND)  in of_kexec_alloc_and_setup_fdt()
322 	ret = fdt_delprop(fdt, chosen_node, "linux,usable-memory-range");  in of_kexec_alloc_and_setup_fdt()
323 	if (ret && ret != -FDT_ERR_NOTFOUND)  in of_kexec_alloc_and_setup_fdt()
327 	prop = fdt_getprop(fdt, chosen_node, "linux,initrd-start", NULL);  in of_kexec_alloc_and_setup_fdt()
333 		prop = fdt_getprop(fdt, chosen_node, "linux,initrd-end", NULL);  in of_kexec_alloc_and_setup_fdt()
335 			ret = -EINVAL;  in of_kexec_alloc_and_setup_fdt()
342 		 * kexec reserves exact initrd size, while firmware may  in of_kexec_alloc_and_setup_fdt()
345 		tmp_size = tmp_end - tmp_start;  in of_kexec_alloc_and_setup_fdt()
347 		if (ret == -ENOENT)  in of_kexec_alloc_and_setup_fdt()
350 		if (ret == -EINVAL)  in of_kexec_alloc_and_setup_fdt()
354 	/* add initrd-* */  in of_kexec_alloc_and_setup_fdt()
356 		ret = fdt_setprop_u64(fdt, chosen_node, "linux,initrd-start",  in of_kexec_alloc_and_setup_fdt()
361 		ret = fdt_setprop_u64(fdt, chosen_node, "linux,initrd-end",  in of_kexec_alloc_and_setup_fdt()
371 		ret = fdt_delprop(fdt, chosen_node, "linux,initrd-start");  in of_kexec_alloc_and_setup_fdt()
372 		if (ret && (ret != -FDT_ERR_NOTFOUND))  in of_kexec_alloc_and_setup_fdt()
375 		ret = fdt_delprop(fdt, chosen_node, "linux,initrd-end");  in of_kexec_alloc_and_setup_fdt()
376 		if (ret && (ret != -FDT_ERR_NOTFOUND))  in of_kexec_alloc_and_setup_fdt()
380 	if (image->type == KEXEC_TYPE_CRASH) {  in of_kexec_alloc_and_setup_fdt()
383 				"linux,elfcorehdr", image->elf_load_addr,  in of_kexec_alloc_and_setup_fdt()
384 				image->elf_headers_sz);  in of_kexec_alloc_and_setup_fdt()
392 		ret = fdt_add_mem_rsv(fdt, image->elf_load_addr,  in of_kexec_alloc_and_setup_fdt()
393 				      image->elf_headers_sz);  in of_kexec_alloc_and_setup_fdt()
397 		/* add linux,usable-memory-range */  in of_kexec_alloc_and_setup_fdt()
399 				"linux,usable-memory-range", crashk_res.start,  in of_kexec_alloc_and_setup_fdt()
400 				crashk_res.end - crashk_res.start + 1);  in of_kexec_alloc_and_setup_fdt()
406 					"linux,usable-memory-range",  in of_kexec_alloc_and_setup_fdt()
408 					crashk_low_res.end - crashk_low_res.start + 1);  in of_kexec_alloc_and_setup_fdt()
421 		if (ret && (ret != -FDT_ERR_NOTFOUND))  in of_kexec_alloc_and_setup_fdt()
425 	/* add kaslr-seed */  in of_kexec_alloc_and_setup_fdt()
426 	ret = fdt_delprop(fdt, chosen_node, "kaslr-seed");  in of_kexec_alloc_and_setup_fdt()
427 	if (ret == -FDT_ERR_NOTFOUND)  in of_kexec_alloc_and_setup_fdt()
435 		ret = fdt_setprop_u64(fdt, chosen_node, "kaslr-seed", seed);  in of_kexec_alloc_and_setup_fdt()
439 		pr_notice("RNG is not initialised: omitting \"%s\" property\n",  in of_kexec_alloc_and_setup_fdt()
440 			  "kaslr-seed");  in of_kexec_alloc_and_setup_fdt()
443 	/* add rng-seed */  in of_kexec_alloc_and_setup_fdt()
447 		ret = fdt_setprop_placeholder(fdt, chosen_node, "rng-seed",  in of_kexec_alloc_and_setup_fdt()
453 		pr_notice("RNG is not initialised: omitting \"%s\" property\n",  in of_kexec_alloc_and_setup_fdt()
454 			  "rng-seed");  in of_kexec_alloc_and_setup_fdt()
457 	ret = fdt_setprop(fdt, chosen_node, "linux,booted-from-kexec", NULL, 0);  in of_kexec_alloc_and_setup_fdt()