1 // SPDX-License-Identifier: GPL-2.0-only
25  * bootargs, kaslr-seed, rng-seed, useable-memory-range and elfcorehdr.
30  * fdt_find_and_del_mem_rsv - delete memory reservation with given address and size
48 			return -EINVAL;  in fdt_find_and_del_mem_rsv()
55 				return -EINVAL;  in fdt_find_and_del_mem_rsv()
62 	return -ENOENT;  in fdt_find_and_del_mem_rsv()
66  * get_addr_size_cells - Get address and size of root node
79 		return -EINVAL;  in get_addr_size_cells()
90  * do_get_kexec_buffer - Get address and size of device tree property
109 		return -ENOENT;  in do_get_kexec_buffer()
118  * ima_get_kexec_buffer - get IMA buffer from the previous kernel
132 		return -ENOTSUPP;  in ima_get_kexec_buffer()
134 	prop = of_get_property(of_chosen, "linux,ima-kexec-buffer", &len);  in ima_get_kexec_buffer()
136 		return -ENOENT;  in ima_get_kexec_buffer()
149  * ima_free_kexec_buffer - free memory used by the IMA buffer
159 		return -ENOTSUPP;  in ima_free_kexec_buffer()
161 	prop = of_find_property(of_chosen, "linux,ima-kexec-buffer", NULL);  in ima_free_kexec_buffer()
163 		return -ENOENT;  in ima_free_kexec_buffer()
165 	ret = do_get_kexec_buffer(prop->value, prop->length, &addr, &size);  in ima_free_kexec_buffer()
178  * remove_ima_buffer - remove the IMA buffer property and reservation from @fdt
196 	prop = fdt_getprop(fdt, chosen_node, "linux,ima-kexec-buffer", &len);  in remove_ima_buffer()
201 	fdt_delprop(fdt, chosen_node, "linux,ima-kexec-buffer");  in remove_ima_buffer()
212  * setup_ima_buffer - add IMA buffer information to the fdt
224 	if (!image->ima_buffer_size)  in setup_ima_buffer()
228 				       "linux,ima-kexec-buffer",  in setup_ima_buffer()
229 				       image->ima_buffer_addr,  in setup_ima_buffer()
230 				       image->ima_buffer_size);  in setup_ima_buffer()
232 		return -EINVAL;  in setup_ima_buffer()
234 	ret = fdt_add_mem_rsv(fdt, image->ima_buffer_addr,  in setup_ima_buffer()
235 			      image->ima_buffer_size);  in setup_ima_buffer()
237 		return -EINVAL;  in setup_ima_buffer()
240 		 image->ima_buffer_addr, image->ima_buffer_size);  in setup_ima_buffer()
253  * of_kexec_alloc_and_setup_fdt - Alloc and setup a new Flattened Device Tree
291 	if (ret == -EINVAL) {  in of_kexec_alloc_and_setup_fdt()
297 	if (chosen_node == -FDT_ERR_NOTFOUND)  in of_kexec_alloc_and_setup_fdt()
306 	if (ret && ret != -FDT_ERR_NOTFOUND)  in of_kexec_alloc_and_setup_fdt()
308 	ret = fdt_delprop(fdt, chosen_node, "linux,usable-memory-range");  in of_kexec_alloc_and_setup_fdt()
309 	if (ret && ret != -FDT_ERR_NOTFOUND)  in of_kexec_alloc_and_setup_fdt()
313 	prop = fdt_getprop(fdt, chosen_node, "linux,initrd-start", NULL);  in of_kexec_alloc_and_setup_fdt()
319 		prop = fdt_getprop(fdt, chosen_node, "linux,initrd-end", NULL);  in of_kexec_alloc_and_setup_fdt()
321 			ret = -EINVAL;  in of_kexec_alloc_and_setup_fdt()
328 		 * kexec reserves exact initrd size, while firmware may  in of_kexec_alloc_and_setup_fdt()
331 		tmp_size = tmp_end - tmp_start;  in of_kexec_alloc_and_setup_fdt()
333 		if (ret == -ENOENT)  in of_kexec_alloc_and_setup_fdt()
336 		if (ret == -EINVAL)  in of_kexec_alloc_and_setup_fdt()
340 	/* add initrd-* */  in of_kexec_alloc_and_setup_fdt()
342 		ret = fdt_setprop_u64(fdt, chosen_node, "linux,initrd-start",  in of_kexec_alloc_and_setup_fdt()
347 		ret = fdt_setprop_u64(fdt, chosen_node, "linux,initrd-end",  in of_kexec_alloc_and_setup_fdt()
357 		ret = fdt_delprop(fdt, chosen_node, "linux,initrd-start");  in of_kexec_alloc_and_setup_fdt()
358 		if (ret && (ret != -FDT_ERR_NOTFOUND))  in of_kexec_alloc_and_setup_fdt()
361 		ret = fdt_delprop(fdt, chosen_node, "linux,initrd-end");  in of_kexec_alloc_and_setup_fdt()
362 		if (ret && (ret != -FDT_ERR_NOTFOUND))  in of_kexec_alloc_and_setup_fdt()
366 	if (image->type == KEXEC_TYPE_CRASH) {  in of_kexec_alloc_and_setup_fdt()
369 				"linux,elfcorehdr", image->elf_load_addr,  in of_kexec_alloc_and_setup_fdt()
370 				image->elf_headers_sz);  in of_kexec_alloc_and_setup_fdt()
378 		ret = fdt_add_mem_rsv(fdt, image->elf_load_addr,  in of_kexec_alloc_and_setup_fdt()
379 				      image->elf_headers_sz);  in of_kexec_alloc_and_setup_fdt()
383 		/* add linux,usable-memory-range */  in of_kexec_alloc_and_setup_fdt()
385 				"linux,usable-memory-range", crashk_res.start,  in of_kexec_alloc_and_setup_fdt()
386 				crashk_res.end - crashk_res.start + 1);  in of_kexec_alloc_and_setup_fdt()
398 		if (ret && (ret != -FDT_ERR_NOTFOUND))  in of_kexec_alloc_and_setup_fdt()
402 	/* add kaslr-seed */  in of_kexec_alloc_and_setup_fdt()
403 	ret = fdt_delprop(fdt, chosen_node, "kaslr-seed");  in of_kexec_alloc_and_setup_fdt()
404 	if (ret == -FDT_ERR_NOTFOUND)  in of_kexec_alloc_and_setup_fdt()
412 		ret = fdt_setprop_u64(fdt, chosen_node, "kaslr-seed", seed);  in of_kexec_alloc_and_setup_fdt()
416 		pr_notice("RNG is not initialised: omitting \"%s\" property\n",  in of_kexec_alloc_and_setup_fdt()
417 			  "kaslr-seed");  in of_kexec_alloc_and_setup_fdt()
420 	/* add rng-seed */  in of_kexec_alloc_and_setup_fdt()
424 		ret = fdt_setprop_placeholder(fdt, chosen_node, "rng-seed",  in of_kexec_alloc_and_setup_fdt()
430 		pr_notice("RNG is not initialised: omitting \"%s\" property\n",  in of_kexec_alloc_and_setup_fdt()
431 			  "rng-seed");  in of_kexec_alloc_and_setup_fdt()
434 	ret = fdt_setprop(fdt, chosen_node, "linux,booted-from-kexec", NULL, 0);  in of_kexec_alloc_and_setup_fdt()