[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, 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 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

struct exit_boot_struct {
	efi_memory_desc_t *runtime_map;
	int *runtime_entry_count;
};

static efi_status_t exit_boot_func(efi_system_table_t *sys_table_arg,
				   struct efi_boot_memmap *map,
				   void *priv)
{
	struct exit_boot_struct *p = priv;
	/*
	 * 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 to SetVirtualAddressMap()
	 */
	efi_get_virtmap(*map->map, *map->map_size, *map->desc_size,
			p->runtime_map, p->runtime_entry_count);

	return EFI_SUCCESS;
}

/*
 * 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, buff_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;
	struct efi_boot_memmap map;
	struct exit_boot_struct priv;

	map.map =	&runtime_map;
	map.map_size =	&map_size;
	map.desc_size =	&desc_size;
	map.desc_ver =	&desc_ver;
	map.key_ptr =	&mmap_key;
	map.buff_size =	&buff_size;

	/*
	 * 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, &map);
	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");

	map.map = &memory_map;
	/*
	 * 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, &map);
		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;
		}
	}

	sys_table->boottime->free_pool(memory_map);
	priv.runtime_map = runtime_map;
	priv.runtime_entry_count = &runtime_entry_count;
	status = efi_exit_boot_services(sys_table, handle, &map, &priv,
					exit_boot_func);

	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	{
500899c2	27	int node, 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
0ceac9e0 MS	56	/*
	57	* Delete all memory reserve map entries. When booting via UEFI,
	58	* kernel will use the UEFI memory map to find reserved regions.
	59	*/
	60	num_rsv = fdt_num_mem_rsv(fdt);
	61	while (num_rsv-- > 0)
	62	fdt_del_mem_rsv(fdt, num_rsv);
	63
263b4a30 RF	64	node = fdt_subnode_offset(fdt, 0, "chosen");
	65	if (node < 0) {
	66	node = fdt_add_subnode(fdt, 0, "chosen");
	67	if (node < 0) {
	68	status = node; /* node is error code when negative */
	69	goto fdt_set_fail;
	70	}
	71	}
	72
	73	if ((cmdline_ptr != NULL) && (strlen(cmdline_ptr) > 0)) {
	74	status = fdt_setprop(fdt, node, "bootargs", cmdline_ptr,
	75	strlen(cmdline_ptr) + 1);
	76	if (status)
	77	goto fdt_set_fail;
	78	}
	79
	80	/* Set initrd address/end in device tree, if present */
	81	if (initrd_size != 0) {
	82	u64 initrd_image_end;
	83	u64 initrd_image_start = cpu_to_fdt64(initrd_addr);
	84
	85	status = fdt_setprop(fdt, node, "linux,initrd-start",
	86	&initrd_image_start, sizeof(u64));
	87	if (status)
	88	goto fdt_set_fail;
	89	initrd_image_end = cpu_to_fdt64(initrd_addr + initrd_size);
	90	status = fdt_setprop(fdt, node, "linux,initrd-end",
	91	&initrd_image_end, sizeof(u64));
	92	if (status)
	93	goto fdt_set_fail;
	94	}
	95
	96	/* Add FDT entries for EFI runtime services in chosen node. */
	97	node = fdt_subnode_offset(fdt, 0, "chosen");
	98	fdt_val64 = cpu_to_fdt64((u64)(unsigned long)sys_table);
	99	status = fdt_setprop(fdt, node, "linux,uefi-system-table",
	100	&fdt_val64, sizeof(fdt_val64));
	101	if (status)
	102	goto fdt_set_fail;
	103
	104	fdt_val64 = cpu_to_fdt64((u64)(unsigned long)memory_map);
	105	status = fdt_setprop(fdt, node, "linux,uefi-mmap-start",
	106	&fdt_val64, sizeof(fdt_val64));
	107	if (status)
	108	goto fdt_set_fail;
	109
	110	fdt_val32 = cpu_to_fdt32(map_size);
	111	status = fdt_setprop(fdt, node, "linux,uefi-mmap-size",
	112	&fdt_val32, sizeof(fdt_val32));
	113	if (status)
	114	goto fdt_set_fail;
	115
	116	fdt_val32 = cpu_to_fdt32(desc_size);
	117	status = fdt_setprop(fdt, node, "linux,uefi-mmap-desc-size",
	118	&fdt_val32, sizeof(fdt_val32));
	119	if (status)
	120	goto fdt_set_fail;
	121
	122	fdt_val32 = cpu_to_fdt32(desc_ver);
	123	status = fdt_setprop(fdt, node, "linux,uefi-mmap-desc-ver",
	124	&fdt_val32, sizeof(fdt_val32));
	125	if (status)
	126	goto fdt_set_fail;
	127
2b5fe07a AB	128	if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {
	129	efi_status_t efi_status;
	130
	131	efi_status = efi_get_random_bytes(sys_table, sizeof(fdt_val64),
	132	(u8 *)&fdt_val64);
	133	if (efi_status == EFI_SUCCESS) {
	134	status = fdt_setprop(fdt, node, "kaslr-seed",
	135	&fdt_val64, sizeof(fdt_val64));
	136	if (status)
	137	goto fdt_set_fail;
	138	} else if (efi_status != EFI_NOT_FOUND) {
	139	return efi_status;
	140	}
	141	}
263b4a30 RF	142	return EFI_SUCCESS;
	143
	144	fdt_set_fail:
	145	if (status == -FDT_ERR_NOSPACE)
	146	return EFI_BUFFER_TOO_SMALL;
	147
	148	return EFI_LOAD_ERROR;
	149	}
	150
	151	#ifndef EFI_FDT_ALIGN
	152	#define EFI_FDT_ALIGN EFI_PAGE_SIZE
	153	#endif
	154
ed9cc156 JH	155	struct exit_boot_struct {
	156	efi_memory_desc_t *runtime_map;
	157	int *runtime_entry_count;
	158	};
	159
	160	static efi_status_t exit_boot_func(efi_system_table_t *sys_table_arg,
	161	struct efi_boot_memmap *map,
	162	void *priv)
	163	{
	164	struct exit_boot_struct *p = priv;
	165	/*
	166	* Update the memory map with virtual addresses. The function will also
	167	* populate @runtime_map with copies of just the EFI_MEMORY_RUNTIME
	168	* entries so that we can pass it straight to SetVirtualAddressMap()
	169	*/
	170	efi_get_virtmap(map->map, map->map_size, *map->desc_size,
	171	p->runtime_map, p->runtime_entry_count);
	172
	173	return EFI_SUCCESS;
	174	}
	175
263b4a30 RF	176	/*
	177	* Allocate memory for a new FDT, then add EFI, commandline, and
	178	* initrd related fields to the FDT. This routine increases the
	179	* FDT allocation size until the allocated memory is large
	180	* enough. EFI allocations are in EFI_PAGE_SIZE granules,
	181	* which are fixed at 4K bytes, so in most cases the first
	182	* allocation should succeed.
	183	* EFI boot services are exited at the end of this function.
	184	* There must be no allocations between the get_memory_map()
	185	* call and the exit_boot_services() call, so the exiting of
	186	* boot services is very tightly tied to the creation of the FDT
	187	* with the final memory map in it.
	188	*/
	189
	190	efi_status_t allocate_new_fdt_and_exit_boot(efi_system_table_t *sys_table,
	191	void *handle,
	192	unsigned long *new_fdt_addr,
	193	unsigned long max_addr,
	194	u64 initrd_addr, u64 initrd_size,
	195	char *cmdline_ptr,
	196	unsigned long fdt_addr,
	197	unsigned long fdt_size)
	198	{
dadb57ab	199	unsigned long map_size, desc_size, buff_size;
263b4a30 RF	200	u32 desc_ver;
263b4a30 RF	201	unsigned long mmap_key;
f3cdfd23	202	efi_memory_desc_t memory_map, runtime_map;
263b4a30 RF	203	unsigned long new_fdt_size;
263b4a30 RF	204	efi_status_t status;
f3cdfd23	205	int runtime_entry_count = 0;
dadb57ab	206	struct efi_boot_memmap map;
ed9cc156	207	struct exit_boot_struct priv;
dadb57ab JH	208
	209	map.map = &runtime_map;
	210	map.map_size = &map_size;
	211	map.desc_size = &desc_size;
	212	map.desc_ver = &desc_ver;
	213	map.key_ptr = &mmap_key;
	214	map.buff_size = &buff_size;
f3cdfd23 AB	215
	216	/*
	217	* Get a copy of the current memory map that we will use to prepare
	218	* the input for SetVirtualAddressMap(). We don't have to worry about
	219	* subsequent allocations adding entries, since they could not affect
	220	* the number of EFI_MEMORY_RUNTIME regions.
	221	*/
dadb57ab	222	status = efi_get_memory_map(sys_table, &map);
f3cdfd23 AB	223	if (status != EFI_SUCCESS) {
	224	pr_efi_err(sys_table, "Unable to retrieve UEFI memory map.\n");
	225	return status;
	226	}
	227
	228	pr_efi(sys_table,
	229	"Exiting boot services and installing virtual address map...\n");
263b4a30	230
dadb57ab	231	map.map = &memory_map;
263b4a30 RF	232	/*
	233	* Estimate size of new FDT, and allocate memory for it. We
	234	* will allocate a bigger buffer if this ends up being too
	235	* small, so a rough guess is OK here.
	236	*/
	237	new_fdt_size = fdt_size + EFI_PAGE_SIZE;
	238	while (1) {
	239	status = efi_high_alloc(sys_table, new_fdt_size, EFI_FDT_ALIGN,
	240	new_fdt_addr, max_addr);
	241	if (status != EFI_SUCCESS) {
	242	pr_efi_err(sys_table, "Unable to allocate memory for new device tree.\n");
	243	goto fail;
	244	}
	245
	246	/*
	247	* Now that we have done our final memory allocation (and free)
	248	* we can get the memory map key needed for
	249	* exit_boot_services().
	250	*/
dadb57ab	251	status = efi_get_memory_map(sys_table, &map);
263b4a30 RF	252	if (status != EFI_SUCCESS)
	253	goto fail_free_new_fdt;
	254
	255	status = update_fdt(sys_table,
	256	(void *)fdt_addr, fdt_size,
	257	(void )new_fdt_addr, new_fdt_size,
	258	cmdline_ptr, initrd_addr, initrd_size,
	259	memory_map, map_size, desc_size, desc_ver);
	260
	261	/* Succeeding the first time is the expected case. */
	262	if (status == EFI_SUCCESS)
	263	break;
	264
	265	if (status == EFI_BUFFER_TOO_SMALL) {
	266	/*
	267	* We need to allocate more space for the new
	268	* device tree, so free existing buffer that is
	269	* too small. Also free memory map, as we will need
	270	* to get new one that reflects the free/alloc we do
	271	* on the device tree buffer.
	272	*/
	273	efi_free(sys_table, new_fdt_size, *new_fdt_addr);
	274	sys_table->boottime->free_pool(memory_map);
	275	new_fdt_size += EFI_PAGE_SIZE;
	276	} else {
e3d132d1	277	pr_efi_err(sys_table, "Unable to construct new device tree.\n");
263b4a30 RF	278	goto fail_free_mmap;
	279	}
	280	}
	281
ed9cc156 JH	282	sys_table->boottime->free_pool(memory_map);
	283	priv.runtime_map = runtime_map;
	284	priv.runtime_entry_count = &runtime_entry_count;
	285	status = efi_exit_boot_services(sys_table, handle, &map, &priv,
	286	exit_boot_func);
263b4a30	287
f3cdfd23 AB	288	if (status == EFI_SUCCESS) {
f3cdfd23 AB	289	efi_set_virtual_address_map_t *svam;
263b4a30	290
f3cdfd23 AB	291	/* Install the new virtual address map */
	292	svam = sys_table->runtime->set_virtual_address_map;
	293	status = svam(runtime_entry_count * desc_size, desc_size,
	294	desc_ver, runtime_map);
	295
	296	/*
	297	* We are beyond the point of no return here, so if the call to
	298	* SetVirtualAddressMap() failed, we need to signal that to the
	299	* incoming kernel but proceed normally otherwise.
	300	*/
	301	if (status != EFI_SUCCESS) {
	302	int l;
	303
	304	/*
	305	* Set the virtual address field of all
	306	* EFI_MEMORY_RUNTIME entries to 0. This will signal
	307	* the incoming kernel that no virtual translation has
	308	* been installed.
	309	*/
	310	for (l = 0; l < map_size; l += desc_size) {
	311	efi_memory_desc_t p = (void )memory_map + l;
	312
	313	if (p->attribute & EFI_MEMORY_RUNTIME)
	314	p->virt_addr = 0;
	315	}
	316	}
	317	return EFI_SUCCESS;
	318	}
263b4a30 RF	319
	320	pr_efi_err(sys_table, "Exit boot services failed.\n");
	321
	322	fail_free_mmap:
	323	sys_table->boottime->free_pool(memory_map);
	324
	325	fail_free_new_fdt:
	326	efi_free(sys_table, new_fdt_size, *new_fdt_addr);
	327
	328	fail:
f3cdfd23	329	sys_table->boottime->free_pool(runtime_map);
263b4a30 RF	330	return EFI_LOAD_ERROR;
	331	}
	332
a643375f	333	void get_fdt(efi_system_table_t sys_table, unsigned long *fdt_size)
263b4a30 RF	334	{
	335	efi_guid_t fdt_guid = DEVICE_TREE_GUID;
	336	efi_config_table_t *tables;
	337	void *fdt;
	338	int i;
	339
	340	tables = (efi_config_table_t *) sys_table->tables;
	341	fdt = NULL;
	342
	343	for (i = 0; i < sys_table->nr_tables; i++)
	344	if (efi_guidcmp(tables[i].guid, fdt_guid) == 0) {
	345	fdt = (void *) tables[i].table;
a643375f AB	346	if (fdt_check_header(fdt) != 0) {
	347	pr_efi_err(sys_table, "Invalid header detected on UEFI supplied FDT, ignoring ...\n");
	348	return NULL;
	349	}
	350	*fdt_size = fdt_totalsize(fdt);
263b4a30 RF	351	break;
	352	}
	353
	354	return fdt;
	355	}