[linux.git] / drivers / firmware / efi / libstub / fdt.c

/*
 * FDT related Helper functions used by the EFI stub on multiple
 * architectures. This should be #included by the EFI stub
 * implementation files.
 *
 * Copyright 2013 Linaro Limited; author Roy Franz
 *
 * This file is part of the Linux kernel, and is made available
 * under the terms of the GNU General Public License version 2.
 *
 */

#include <linux/efi.h>
#include <linux/libfdt.h>
#include <asm/efi.h>

#include "efistub.h"

efi_status_t update_fdt(efi_system_table_t *sys_table, void *orig_fdt,
			unsigned long orig_fdt_size,
			void *fdt, int new_fdt_size, char *cmdline_ptr,
			u64 initrd_addr, u64 initrd_size,
			efi_memory_desc_t *memory_map,
			unsigned long map_size, unsigned long desc_size,
			u32 desc_ver)
{
	int node, prev, num_rsv;
	int status;
	u32 fdt_val32;
	u64 fdt_val64;

	/* Do some checks on provided FDT, if it exists*/
	if (orig_fdt) {
		if (fdt_check_header(orig_fdt)) {
			pr_efi_err(sys_table, "Device Tree header not valid!\n");
			return EFI_LOAD_ERROR;
		}
		/*
		 * We don't get the size of the FDT if we get if from a
		 * configuration table.
		 */
		if (orig_fdt_size && fdt_totalsize(orig_fdt) > orig_fdt_size) {
			pr_efi_err(sys_table, "Truncated device tree! foo!\n");
			return EFI_LOAD_ERROR;
		}
	}

	if (orig_fdt)
		status = fdt_open_into(orig_fdt, fdt, new_fdt_size);
	else
		status = fdt_create_empty_tree(fdt, new_fdt_size);

	if (status != 0)
		goto fdt_set_fail;

	/*
	 * Delete any memory nodes present. We must delete nodes which
	 * early_init_dt_scan_memory may try to use.
	 */
	prev = 0;
	for (;;) {
		const char *type;
		int len;

		node = fdt_next_node(fdt, prev, NULL);
		if (node < 0)
			break;

		type = fdt_getprop(fdt, node, "device_type", &len);
		if (type && strncmp(type, "memory", len) == 0) {
			fdt_del_node(fdt, node);
			continue;
		}

		prev = node;
	}

	/*
	 * Delete all memory reserve map entries. When booting via UEFI,
	 * kernel will use the UEFI memory map to find reserved regions.
	 */
	num_rsv = fdt_num_mem_rsv(fdt);
	while (num_rsv-- > 0)
		fdt_del_mem_rsv(fdt, num_rsv);

	node = fdt_subnode_offset(fdt, 0, "chosen");
	if (node < 0) {
		node = fdt_add_subnode(fdt, 0, "chosen");
		if (node < 0) {
			status = node; /* node is error code when negative */
			goto fdt_set_fail;
		}
	}

	if ((cmdline_ptr != NULL) && (strlen(cmdline_ptr) > 0)) {
		status = fdt_setprop(fdt, node, "bootargs", cmdline_ptr,
				     strlen(cmdline_ptr) + 1);
		if (status)
			goto fdt_set_fail;
	}

	/* Set initrd address/end in device tree, if present */
	if (initrd_size != 0) {
		u64 initrd_image_end;
		u64 initrd_image_start = cpu_to_fdt64(initrd_addr);

		status = fdt_setprop(fdt, node, "linux,initrd-start",
				     &initrd_image_start, sizeof(u64));
		if (status)
			goto fdt_set_fail;
		initrd_image_end = cpu_to_fdt64(initrd_addr + initrd_size);
		status = fdt_setprop(fdt, node, "linux,initrd-end",
				     &initrd_image_end, sizeof(u64));
		if (status)
			goto fdt_set_fail;
	}

	/* Add FDT entries for EFI runtime services in chosen node. */
	node = fdt_subnode_offset(fdt, 0, "chosen");
	fdt_val64 = cpu_to_fdt64((u64)(unsigned long)sys_table);
	status = fdt_setprop(fdt, node, "linux,uefi-system-table",
			     &fdt_val64, sizeof(fdt_val64));
	if (status)
		goto fdt_set_fail;

	fdt_val64 = cpu_to_fdt64((u64)(unsigned long)memory_map);
	status = fdt_setprop(fdt, node, "linux,uefi-mmap-start",
			     &fdt_val64,  sizeof(fdt_val64));
	if (status)
		goto fdt_set_fail;

	fdt_val32 = cpu_to_fdt32(map_size);
	status = fdt_setprop(fdt, node, "linux,uefi-mmap-size",
			     &fdt_val32,  sizeof(fdt_val32));
	if (status)
		goto fdt_set_fail;

	fdt_val32 = cpu_to_fdt32(desc_size);
	status = fdt_setprop(fdt, node, "linux,uefi-mmap-desc-size",
			     &fdt_val32, sizeof(fdt_val32));
	if (status)
		goto fdt_set_fail;

	fdt_val32 = cpu_to_fdt32(desc_ver);
	status = fdt_setprop(fdt, node, "linux,uefi-mmap-desc-ver",
			     &fdt_val32, sizeof(fdt_val32));
	if (status)
		goto fdt_set_fail;

	if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {
		efi_status_t efi_status;

		efi_status = efi_get_random_bytes(sys_table, sizeof(fdt_val64),
						  (u8 *)&fdt_val64);
		if (efi_status == EFI_SUCCESS) {
			status = fdt_setprop(fdt, node, "kaslr-seed",
					     &fdt_val64, sizeof(fdt_val64));
			if (status)
				goto fdt_set_fail;
		} else if (efi_status != EFI_NOT_FOUND) {
			return efi_status;
		}
	}
	return EFI_SUCCESS;

fdt_set_fail:
	if (status == -FDT_ERR_NOSPACE)
		return EFI_BUFFER_TOO_SMALL;

	return EFI_LOAD_ERROR;
}

#ifndef EFI_FDT_ALIGN
#define EFI_FDT_ALIGN EFI_PAGE_SIZE
#endif

/*
 * Allocate memory for a new FDT, then add EFI, commandline, and
 * initrd related fields to the FDT.  This routine increases the
 * FDT allocation size until the allocated memory is large
 * enough.  EFI allocations are in EFI_PAGE_SIZE granules,
 * which are fixed at 4K bytes, so in most cases the first
 * allocation should succeed.
 * EFI boot services are exited at the end of this function.
 * There must be no allocations between the get_memory_map()
 * call and the exit_boot_services() call, so the exiting of
 * boot services is very tightly tied to the creation of the FDT
 * with the final memory map in it.
 */

efi_status_t allocate_new_fdt_and_exit_boot(efi_system_table_t *sys_table,
					    void *handle,
					    unsigned long *new_fdt_addr,
					    unsigned long max_addr,
					    u64 initrd_addr, u64 initrd_size,
					    char *cmdline_ptr,
					    unsigned long fdt_addr,
					    unsigned long fdt_size)
{
	unsigned long map_size, desc_size;
	u32 desc_ver;
	unsigned long mmap_key;
	efi_memory_desc_t *memory_map, *runtime_map;
	unsigned long new_fdt_size;
	efi_status_t status;
	int runtime_entry_count = 0;

	/*
	 * Get a copy of the current memory map that we will use to prepare
	 * the input for SetVirtualAddressMap(). We don't have to worry about
	 * subsequent allocations adding entries, since they could not affect
	 * the number of EFI_MEMORY_RUNTIME regions.
	 */
	status = efi_get_memory_map(sys_table, &runtime_map, &map_size,
				    &desc_size, &desc_ver, &mmap_key);
	if (status != EFI_SUCCESS) {
		pr_efi_err(sys_table, "Unable to retrieve UEFI memory map.\n");
		return status;
	}

	pr_efi(sys_table,
	       "Exiting boot services and installing virtual address map...\n");

	/*
	 * Estimate size of new FDT, and allocate memory for it. We
	 * will allocate a bigger buffer if this ends up being too
	 * small, so a rough guess is OK here.
	 */
	new_fdt_size = fdt_size + EFI_PAGE_SIZE;
	while (1) {
		status = efi_high_alloc(sys_table, new_fdt_size, EFI_FDT_ALIGN,
					new_fdt_addr, max_addr);
		if (status != EFI_SUCCESS) {
			pr_efi_err(sys_table, "Unable to allocate memory for new device tree.\n");
			goto fail;
		}

		/*
		 * Now that we have done our final memory allocation (and free)
		 * we can get the memory map key  needed for
		 * exit_boot_services().
		 */
		status = efi_get_memory_map(sys_table, &memory_map, &map_size,
					    &desc_size, &desc_ver, &mmap_key);
		if (status != EFI_SUCCESS)
			goto fail_free_new_fdt;

		status = update_fdt(sys_table,
				    (void *)fdt_addr, fdt_size,
				    (void *)*new_fdt_addr, new_fdt_size,
				    cmdline_ptr, initrd_addr, initrd_size,
				    memory_map, map_size, desc_size, desc_ver);

		/* Succeeding the first time is the expected case. */
		if (status == EFI_SUCCESS)
			break;

		if (status == EFI_BUFFER_TOO_SMALL) {
			/*
			 * We need to allocate more space for the new
			 * device tree, so free existing buffer that is
			 * too small.  Also free memory map, as we will need
			 * to get new one that reflects the free/alloc we do
			 * on the device tree buffer.
			 */
			efi_free(sys_table, new_fdt_size, *new_fdt_addr);
			sys_table->boottime->free_pool(memory_map);
			new_fdt_size += EFI_PAGE_SIZE;
		} else {
			pr_efi_err(sys_table, "Unable to construct new device tree.\n");
			goto fail_free_mmap;
		}
	}

	/*
	 * Update the memory map with virtual addresses. The function will also
	 * populate @runtime_map with copies of just the EFI_MEMORY_RUNTIME
	 * entries so that we can pass it straight into SetVirtualAddressMap()
	 */
	efi_get_virtmap(memory_map, map_size, desc_size, runtime_map,
			&runtime_entry_count);

	/* Now we are ready to exit_boot_services.*/
	status = sys_table->boottime->exit_boot_services(handle, mmap_key);

	if (status == EFI_SUCCESS) {
		efi_set_virtual_address_map_t *svam;

		/* Install the new virtual address map */
		svam = sys_table->runtime->set_virtual_address_map;
		status = svam(runtime_entry_count * desc_size, desc_size,
			      desc_ver, runtime_map);

		/*
		 * We are beyond the point of no return here, so if the call to
		 * SetVirtualAddressMap() failed, we need to signal that to the
		 * incoming kernel but proceed normally otherwise.
		 */
		if (status != EFI_SUCCESS) {
			int l;

			/*
			 * Set the virtual address field of all
			 * EFI_MEMORY_RUNTIME entries to 0. This will signal
			 * the incoming kernel that no virtual translation has
			 * been installed.
			 */
			for (l = 0; l < map_size; l += desc_size) {
				efi_memory_desc_t *p = (void *)memory_map + l;

				if (p->attribute & EFI_MEMORY_RUNTIME)
					p->virt_addr = 0;
			}
		}
		return EFI_SUCCESS;
	}

	pr_efi_err(sys_table, "Exit boot services failed.\n");

fail_free_mmap:
	sys_table->boottime->free_pool(memory_map);

fail_free_new_fdt:
	efi_free(sys_table, new_fdt_size, *new_fdt_addr);

fail:
	sys_table->boottime->free_pool(runtime_map);
	return EFI_LOAD_ERROR;
}

void *get_fdt(efi_system_table_t *sys_table, unsigned long *fdt_size)
{
	efi_guid_t fdt_guid = DEVICE_TREE_GUID;
	efi_config_table_t *tables;
	void *fdt;
	int i;

	tables = (efi_config_table_t *) sys_table->tables;
	fdt = NULL;

	for (i = 0; i < sys_table->nr_tables; i++)
		if (efi_guidcmp(tables[i].guid, fdt_guid) == 0) {
			fdt = (void *) tables[i].table;
			if (fdt_check_header(fdt) != 0) {
				pr_efi_err(sys_table, "Invalid header detected on UEFI supplied FDT, ignoring ...\n");
				return NULL;
			}
			*fdt_size = fdt_totalsize(fdt);
			break;
	 }

	return fdt;
}
Commit	Line	Data
263b4a30 RF	1	/*
	2	* FDT related Helper functions used by the EFI stub on multiple
	3	* architectures. This should be #included by the EFI stub
	4	* implementation files.
	5	*
	6	* Copyright 2013 Linaro Limited; author Roy Franz
	7	*
	8	* This file is part of the Linux kernel, and is made available
	9	* under the terms of the GNU General Public License version 2.
	10	*
	11	*/
	12
bd669475 AB	13	#include <linux/efi.h>
	14	#include <linux/libfdt.h>
	15	#include <asm/efi.h>
	16
f3cdfd23 AB	17	#include "efistub.h"
f3cdfd23 AB	18
bd669475 AB	19	efi_status_t update_fdt(efi_system_table_t sys_table, void orig_fdt,
	20	unsigned long orig_fdt_size,
	21	void fdt, int new_fdt_size, char cmdline_ptr,
	22	u64 initrd_addr, u64 initrd_size,
	23	efi_memory_desc_t *memory_map,
	24	unsigned long map_size, unsigned long desc_size,
	25	u32 desc_ver)
263b4a30	26	{
0ceac9e0	27	int node, prev, num_rsv;
263b4a30 RF	28	int status;
	29	u32 fdt_val32;
	30	u64 fdt_val64;
	31
263b4a30 RF	32	/* Do some checks on provided FDT, if it exists*/
	33	if (orig_fdt) {
	34	if (fdt_check_header(orig_fdt)) {
	35	pr_efi_err(sys_table, "Device Tree header not valid!\n");
	36	return EFI_LOAD_ERROR;
	37	}
	38	/*
	39	* We don't get the size of the FDT if we get if from a
	40	* configuration table.
	41	*/
	42	if (orig_fdt_size && fdt_totalsize(orig_fdt) > orig_fdt_size) {
	43	pr_efi_err(sys_table, "Truncated device tree! foo!\n");
	44	return EFI_LOAD_ERROR;
	45	}
	46	}
	47
	48	if (orig_fdt)
	49	status = fdt_open_into(orig_fdt, fdt, new_fdt_size);
	50	else
	51	status = fdt_create_empty_tree(fdt, new_fdt_size);
	52
	53	if (status != 0)
	54	goto fdt_set_fail;
	55
	56	/*
	57	* Delete any memory nodes present. We must delete nodes which
	58	* early_init_dt_scan_memory may try to use.
	59	*/
	60	prev = 0;
	61	for (;;) {
6fb8cc82	62	const char *type;
263b4a30 RF	63	int len;
	64
	65	node = fdt_next_node(fdt, prev, NULL);
	66	if (node < 0)
	67	break;
	68
	69	type = fdt_getprop(fdt, node, "device_type", &len);
	70	if (type && strncmp(type, "memory", len) == 0) {
	71	fdt_del_node(fdt, node);
	72	continue;
	73	}
	74
	75	prev = node;
	76	}
	77
0ceac9e0 MS	78	/*
	79	* Delete all memory reserve map entries. When booting via UEFI,
	80	* kernel will use the UEFI memory map to find reserved regions.
	81	*/
	82	num_rsv = fdt_num_mem_rsv(fdt);
	83	while (num_rsv-- > 0)
	84	fdt_del_mem_rsv(fdt, num_rsv);
	85
263b4a30 RF	86	node = fdt_subnode_offset(fdt, 0, "chosen");
	87	if (node < 0) {
	88	node = fdt_add_subnode(fdt, 0, "chosen");
	89	if (node < 0) {
	90	status = node; /* node is error code when negative */
	91	goto fdt_set_fail;
	92	}
	93	}
	94
	95	if ((cmdline_ptr != NULL) && (strlen(cmdline_ptr) > 0)) {
	96	status = fdt_setprop(fdt, node, "bootargs", cmdline_ptr,
	97	strlen(cmdline_ptr) + 1);
	98	if (status)
	99	goto fdt_set_fail;
	100	}
	101
	102	/* Set initrd address/end in device tree, if present */
	103	if (initrd_size != 0) {
	104	u64 initrd_image_end;
	105	u64 initrd_image_start = cpu_to_fdt64(initrd_addr);
	106
	107	status = fdt_setprop(fdt, node, "linux,initrd-start",
	108	&initrd_image_start, sizeof(u64));
	109	if (status)
	110	goto fdt_set_fail;
	111	initrd_image_end = cpu_to_fdt64(initrd_addr + initrd_size);
	112	status = fdt_setprop(fdt, node, "linux,initrd-end",
	113	&initrd_image_end, sizeof(u64));
	114	if (status)
	115	goto fdt_set_fail;
	116	}
	117
	118	/* Add FDT entries for EFI runtime services in chosen node. */
	119	node = fdt_subnode_offset(fdt, 0, "chosen");
	120	fdt_val64 = cpu_to_fdt64((u64)(unsigned long)sys_table);
	121	status = fdt_setprop(fdt, node, "linux,uefi-system-table",
	122	&fdt_val64, sizeof(fdt_val64));
	123	if (status)
	124	goto fdt_set_fail;
	125
	126	fdt_val64 = cpu_to_fdt64((u64)(unsigned long)memory_map);
	127	status = fdt_setprop(fdt, node, "linux,uefi-mmap-start",
	128	&fdt_val64, sizeof(fdt_val64));
	129	if (status)
	130	goto fdt_set_fail;
	131
	132	fdt_val32 = cpu_to_fdt32(map_size);
	133	status = fdt_setprop(fdt, node, "linux,uefi-mmap-size",
	134	&fdt_val32, sizeof(fdt_val32));
	135	if (status)
	136	goto fdt_set_fail;
	137
	138	fdt_val32 = cpu_to_fdt32(desc_size);
	139	status = fdt_setprop(fdt, node, "linux,uefi-mmap-desc-size",
	140	&fdt_val32, sizeof(fdt_val32));
	141	if (status)
	142	goto fdt_set_fail;
	143
	144	fdt_val32 = cpu_to_fdt32(desc_ver);
	145	status = fdt_setprop(fdt, node, "linux,uefi-mmap-desc-ver",
	146	&fdt_val32, sizeof(fdt_val32));
	147	if (status)
	148	goto fdt_set_fail;
	149
2b5fe07a AB	150	if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {
	151	efi_status_t efi_status;
	152
	153	efi_status = efi_get_random_bytes(sys_table, sizeof(fdt_val64),
	154	(u8 *)&fdt_val64);
	155	if (efi_status == EFI_SUCCESS) {
	156	status = fdt_setprop(fdt, node, "kaslr-seed",
	157	&fdt_val64, sizeof(fdt_val64));
	158	if (status)
	159	goto fdt_set_fail;
	160	} else if (efi_status != EFI_NOT_FOUND) {
	161	return efi_status;
	162	}
	163	}
263b4a30 RF	164	return EFI_SUCCESS;
	165
	166	fdt_set_fail:
	167	if (status == -FDT_ERR_NOSPACE)
	168	return EFI_BUFFER_TOO_SMALL;
	169
	170	return EFI_LOAD_ERROR;
	171	}
	172
	173	#ifndef EFI_FDT_ALIGN
	174	#define EFI_FDT_ALIGN EFI_PAGE_SIZE
	175	#endif
	176
	177	/*
	178	* Allocate memory for a new FDT, then add EFI, commandline, and
	179	* initrd related fields to the FDT. This routine increases the
	180	* FDT allocation size until the allocated memory is large
	181	* enough. EFI allocations are in EFI_PAGE_SIZE granules,
	182	* which are fixed at 4K bytes, so in most cases the first
	183	* allocation should succeed.
	184	* EFI boot services are exited at the end of this function.
	185	* There must be no allocations between the get_memory_map()
	186	* call and the exit_boot_services() call, so the exiting of
	187	* boot services is very tightly tied to the creation of the FDT
	188	* with the final memory map in it.
	189	*/
	190
	191	efi_status_t allocate_new_fdt_and_exit_boot(efi_system_table_t *sys_table,
	192	void *handle,
	193	unsigned long *new_fdt_addr,
	194	unsigned long max_addr,
	195	u64 initrd_addr, u64 initrd_size,
	196	char *cmdline_ptr,
	197	unsigned long fdt_addr,
	198	unsigned long fdt_size)
	199	{
	200	unsigned long map_size, desc_size;
	201	u32 desc_ver;
	202	unsigned long mmap_key;
f3cdfd23	203	efi_memory_desc_t memory_map, runtime_map;
263b4a30 RF	204	unsigned long new_fdt_size;
263b4a30 RF	205	efi_status_t status;
f3cdfd23 AB	206	int runtime_entry_count = 0;
	207
	208	/*
	209	* Get a copy of the current memory map that we will use to prepare
	210	* the input for SetVirtualAddressMap(). We don't have to worry about
	211	* subsequent allocations adding entries, since they could not affect
	212	* the number of EFI_MEMORY_RUNTIME regions.
	213	*/
	214	status = efi_get_memory_map(sys_table, &runtime_map, &map_size,
	215	&desc_size, &desc_ver, &mmap_key);
	216	if (status != EFI_SUCCESS) {
	217	pr_efi_err(sys_table, "Unable to retrieve UEFI memory map.\n");
	218	return status;
	219	}
	220
	221	pr_efi(sys_table,
	222	"Exiting boot services and installing virtual address map...\n");
263b4a30 RF	223
	224	/*
	225	* Estimate size of new FDT, and allocate memory for it. We
	226	* will allocate a bigger buffer if this ends up being too
	227	* small, so a rough guess is OK here.
	228	*/
	229	new_fdt_size = fdt_size + EFI_PAGE_SIZE;
	230	while (1) {
	231	status = efi_high_alloc(sys_table, new_fdt_size, EFI_FDT_ALIGN,
	232	new_fdt_addr, max_addr);
	233	if (status != EFI_SUCCESS) {
	234	pr_efi_err(sys_table, "Unable to allocate memory for new device tree.\n");
	235	goto fail;
	236	}
	237
	238	/*
	239	* Now that we have done our final memory allocation (and free)
	240	* we can get the memory map key needed for
	241	* exit_boot_services().
	242	*/
	243	status = efi_get_memory_map(sys_table, &memory_map, &map_size,
	244	&desc_size, &desc_ver, &mmap_key);
	245	if (status != EFI_SUCCESS)
	246	goto fail_free_new_fdt;
	247
	248	status = update_fdt(sys_table,
	249	(void *)fdt_addr, fdt_size,
	250	(void )new_fdt_addr, new_fdt_size,
	251	cmdline_ptr, initrd_addr, initrd_size,
	252	memory_map, map_size, desc_size, desc_ver);
	253
	254	/* Succeeding the first time is the expected case. */
	255	if (status == EFI_SUCCESS)
	256	break;
	257
	258	if (status == EFI_BUFFER_TOO_SMALL) {
	259	/*
	260	* We need to allocate more space for the new
	261	* device tree, so free existing buffer that is
	262	* too small. Also free memory map, as we will need
	263	* to get new one that reflects the free/alloc we do
	264	* on the device tree buffer.
	265	*/
	266	efi_free(sys_table, new_fdt_size, *new_fdt_addr);
	267	sys_table->boottime->free_pool(memory_map);
	268	new_fdt_size += EFI_PAGE_SIZE;
	269	} else {
e3d132d1	270	pr_efi_err(sys_table, "Unable to construct new device tree.\n");
263b4a30 RF	271	goto fail_free_mmap;
	272	}
	273	}
	274
f3cdfd23 AB	275	/*
	276	* Update the memory map with virtual addresses. The function will also
	277	* populate @runtime_map with copies of just the EFI_MEMORY_RUNTIME
	278	* entries so that we can pass it straight into SetVirtualAddressMap()
	279	*/
	280	efi_get_virtmap(memory_map, map_size, desc_size, runtime_map,
	281	&runtime_entry_count);
	282
263b4a30 RF	283	/* Now we are ready to exit_boot_services.*/
	284	status = sys_table->boottime->exit_boot_services(handle, mmap_key);
	285
f3cdfd23 AB	286	if (status == EFI_SUCCESS) {
f3cdfd23 AB	287	efi_set_virtual_address_map_t *svam;
263b4a30	288
f3cdfd23 AB	289	/* Install the new virtual address map */
	290	svam = sys_table->runtime->set_virtual_address_map;
	291	status = svam(runtime_entry_count * desc_size, desc_size,
	292	desc_ver, runtime_map);
	293
	294	/*
	295	* We are beyond the point of no return here, so if the call to
	296	* SetVirtualAddressMap() failed, we need to signal that to the
	297	* incoming kernel but proceed normally otherwise.
	298	*/
	299	if (status != EFI_SUCCESS) {
	300	int l;
	301
	302	/*
	303	* Set the virtual address field of all
	304	* EFI_MEMORY_RUNTIME entries to 0. This will signal
	305	* the incoming kernel that no virtual translation has
	306	* been installed.
	307	*/
	308	for (l = 0; l < map_size; l += desc_size) {
	309	efi_memory_desc_t p = (void )memory_map + l;
	310
	311	if (p->attribute & EFI_MEMORY_RUNTIME)
	312	p->virt_addr = 0;
	313	}
	314	}
	315	return EFI_SUCCESS;
	316	}
263b4a30 RF	317
	318	pr_efi_err(sys_table, "Exit boot services failed.\n");
	319
	320	fail_free_mmap:
	321	sys_table->boottime->free_pool(memory_map);
	322
	323	fail_free_new_fdt:
	324	efi_free(sys_table, new_fdt_size, *new_fdt_addr);
	325
	326	fail:
f3cdfd23	327	sys_table->boottime->free_pool(runtime_map);
263b4a30 RF	328	return EFI_LOAD_ERROR;
	329	}
	330
a643375f	331	void get_fdt(efi_system_table_t sys_table, unsigned long *fdt_size)
263b4a30 RF	332	{
	333	efi_guid_t fdt_guid = DEVICE_TREE_GUID;
	334	efi_config_table_t *tables;
	335	void *fdt;
	336	int i;
	337
	338	tables = (efi_config_table_t *) sys_table->tables;
	339	fdt = NULL;
	340
	341	for (i = 0; i < sys_table->nr_tables; i++)
	342	if (efi_guidcmp(tables[i].guid, fdt_guid) == 0) {
	343	fdt = (void *) tables[i].table;
a643375f AB	344	if (fdt_check_header(fdt) != 0) {
	345	pr_efi_err(sys_table, "Invalid header detected on UEFI supplied FDT, ignoring ...\n");
	346	return NULL;
	347	}
	348	*fdt_size = fdt_totalsize(fdt);
263b4a30 RF	349	break;
	350	}
	351
	352	return fdt;
	353	}