[mirror_ubuntu-artful-kernel.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"

static 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)
{
	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 = U64_MAX; /* placeholder */
	status = fdt_setprop(fdt, node, "linux,uefi-mmap-start",
			     &fdt_val64,  sizeof(fdt_val64));
	if (status)
		goto fdt_set_fail;

	fdt_val32 = U32_MAX; /* placeholder */
	status = fdt_setprop(fdt, node, "linux,uefi-mmap-size",
			     &fdt_val32,  sizeof(fdt_val32));
	if (status)
		goto fdt_set_fail;

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

	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;
}

static efi_status_t update_fdt_memmap(void *fdt, struct efi_boot_memmap *map)
{
	int node = fdt_path_offset(fdt, "/chosen");
	u64 fdt_val64;
	u32 fdt_val32;
	int err;

	if (node < 0)
		return EFI_LOAD_ERROR;

	fdt_val64 = cpu_to_fdt64((unsigned long)*map->map);
	err = fdt_setprop_inplace(fdt, node, "linux,uefi-mmap-start",
				  &fdt_val64, sizeof(fdt_val64));
	if (err)
		return EFI_LOAD_ERROR;

	fdt_val32 = cpu_to_fdt32(*map->map_size);
	err = fdt_setprop_inplace(fdt, node, "linux,uefi-mmap-size",
				  &fdt_val32, sizeof(fdt_val32));
	if (err)
		return EFI_LOAD_ERROR;

	fdt_val32 = cpu_to_fdt32(*map->desc_size);
	err = fdt_setprop_inplace(fdt, node, "linux,uefi-mmap-desc-size",
				  &fdt_val32, sizeof(fdt_val32));
	if (err)
		return EFI_LOAD_ERROR;

	fdt_val32 = cpu_to_fdt32(*map->desc_ver);
	err = fdt_setprop_inplace(fdt, node, "linux,uefi-mmap-desc-ver",
				  &fdt_val32, sizeof(fdt_val32));
	if (err)
		return EFI_LOAD_ERROR;

	return EFI_SUCCESS;
}

#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;
	void *new_fdt_addr;
};

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 update_fdt_memmap(p->new_fdt_addr, map);
}

/*
 * 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;
		}

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

		/* 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.
			 */
			efi_free(sys_table, new_fdt_size, *new_fdt_addr);
			new_fdt_size += EFI_PAGE_SIZE;
		} else {
			pr_efi_err(sys_table, "Unable to construct new device tree.\n");
			goto fail_free_new_fdt;
		}
	}

	priv.runtime_map = runtime_map;
	priv.runtime_entry_count = &runtime_entry_count;
	priv.new_fdt_addr = (void *)*new_fdt_addr;
	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_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
abfb7b68 AB	19	static 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)
263b4a30	23	{
500899c2	24	int node, num_rsv;
263b4a30 RF	25	int status;
	26	u32 fdt_val32;
	27	u64 fdt_val64;
	28
263b4a30 RF	29	/* Do some checks on provided FDT, if it exists*/
	30	if (orig_fdt) {
	31	if (fdt_check_header(orig_fdt)) {
	32	pr_efi_err(sys_table, "Device Tree header not valid!\n");
	33	return EFI_LOAD_ERROR;
	34	}
	35	/*
	36	* We don't get the size of the FDT if we get if from a
	37	* configuration table.
	38	*/
	39	if (orig_fdt_size && fdt_totalsize(orig_fdt) > orig_fdt_size) {
	40	pr_efi_err(sys_table, "Truncated device tree! foo!\n");
	41	return EFI_LOAD_ERROR;
	42	}
	43	}
	44
	45	if (orig_fdt)
	46	status = fdt_open_into(orig_fdt, fdt, new_fdt_size);
	47	else
	48	status = fdt_create_empty_tree(fdt, new_fdt_size);
	49
	50	if (status != 0)
	51	goto fdt_set_fail;
	52
0ceac9e0 MS	53	/*
	54	* Delete all memory reserve map entries. When booting via UEFI,
	55	* kernel will use the UEFI memory map to find reserved regions.
	56	*/
	57	num_rsv = fdt_num_mem_rsv(fdt);
	58	while (num_rsv-- > 0)
	59	fdt_del_mem_rsv(fdt, num_rsv);
	60
263b4a30 RF	61	node = fdt_subnode_offset(fdt, 0, "chosen");
	62	if (node < 0) {
	63	node = fdt_add_subnode(fdt, 0, "chosen");
	64	if (node < 0) {
	65	status = node; /* node is error code when negative */
	66	goto fdt_set_fail;
	67	}
	68	}
	69
	70	if ((cmdline_ptr != NULL) && (strlen(cmdline_ptr) > 0)) {
	71	status = fdt_setprop(fdt, node, "bootargs", cmdline_ptr,
	72	strlen(cmdline_ptr) + 1);
	73	if (status)
	74	goto fdt_set_fail;
	75	}
	76
	77	/* Set initrd address/end in device tree, if present */
	78	if (initrd_size != 0) {
	79	u64 initrd_image_end;
	80	u64 initrd_image_start = cpu_to_fdt64(initrd_addr);
	81
	82	status = fdt_setprop(fdt, node, "linux,initrd-start",
	83	&initrd_image_start, sizeof(u64));
	84	if (status)
	85	goto fdt_set_fail;
	86	initrd_image_end = cpu_to_fdt64(initrd_addr + initrd_size);
	87	status = fdt_setprop(fdt, node, "linux,initrd-end",
	88	&initrd_image_end, sizeof(u64));
	89	if (status)
	90	goto fdt_set_fail;
	91	}
	92
	93	/* Add FDT entries for EFI runtime services in chosen node. */
	94	node = fdt_subnode_offset(fdt, 0, "chosen");
	95	fdt_val64 = cpu_to_fdt64((u64)(unsigned long)sys_table);
	96	status = fdt_setprop(fdt, node, "linux,uefi-system-table",
	97	&fdt_val64, sizeof(fdt_val64));
	98	if (status)
	99	goto fdt_set_fail;
	100
abfb7b68	101	fdt_val64 = U64_MAX; /* placeholder */
263b4a30 RF	102	status = fdt_setprop(fdt, node, "linux,uefi-mmap-start",
	103	&fdt_val64, sizeof(fdt_val64));
	104	if (status)
	105	goto fdt_set_fail;
	106
abfb7b68	107	fdt_val32 = U32_MAX; /* placeholder */
263b4a30 RF	108	status = fdt_setprop(fdt, node, "linux,uefi-mmap-size",
	109	&fdt_val32, sizeof(fdt_val32));
	110	if (status)
	111	goto fdt_set_fail;
	112
263b4a30 RF	113	status = fdt_setprop(fdt, node, "linux,uefi-mmap-desc-size",
	114	&fdt_val32, sizeof(fdt_val32));
	115	if (status)
	116	goto fdt_set_fail;
	117
263b4a30 RF	118	status = fdt_setprop(fdt, node, "linux,uefi-mmap-desc-ver",
	119	&fdt_val32, sizeof(fdt_val32));
	120	if (status)
	121	goto fdt_set_fail;
	122
2b5fe07a AB	123	if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {
	124	efi_status_t efi_status;
	125
	126	efi_status = efi_get_random_bytes(sys_table, sizeof(fdt_val64),
	127	(u8 *)&fdt_val64);
	128	if (efi_status == EFI_SUCCESS) {
	129	status = fdt_setprop(fdt, node, "kaslr-seed",
	130	&fdt_val64, sizeof(fdt_val64));
	131	if (status)
	132	goto fdt_set_fail;
	133	} else if (efi_status != EFI_NOT_FOUND) {
	134	return efi_status;
	135	}
	136	}
263b4a30 RF	137	return EFI_SUCCESS;
	138
	139	fdt_set_fail:
	140	if (status == -FDT_ERR_NOSPACE)
	141	return EFI_BUFFER_TOO_SMALL;
	142
	143	return EFI_LOAD_ERROR;
	144	}
	145
abfb7b68 AB	146	static efi_status_t update_fdt_memmap(void fdt, struct efi_boot_memmap map)
	147	{
	148	int node = fdt_path_offset(fdt, "/chosen");
	149	u64 fdt_val64;
	150	u32 fdt_val32;
	151	int err;
	152
	153	if (node < 0)
	154	return EFI_LOAD_ERROR;
	155
	156	fdt_val64 = cpu_to_fdt64((unsigned long)*map->map);
	157	err = fdt_setprop_inplace(fdt, node, "linux,uefi-mmap-start",
	158	&fdt_val64, sizeof(fdt_val64));
	159	if (err)
	160	return EFI_LOAD_ERROR;
	161
	162	fdt_val32 = cpu_to_fdt32(*map->map_size);
	163	err = fdt_setprop_inplace(fdt, node, "linux,uefi-mmap-size",
	164	&fdt_val32, sizeof(fdt_val32));
	165	if (err)
	166	return EFI_LOAD_ERROR;
	167
	168	fdt_val32 = cpu_to_fdt32(*map->desc_size);
	169	err = fdt_setprop_inplace(fdt, node, "linux,uefi-mmap-desc-size",
	170	&fdt_val32, sizeof(fdt_val32));
	171	if (err)
	172	return EFI_LOAD_ERROR;
	173
	174	fdt_val32 = cpu_to_fdt32(*map->desc_ver);
	175	err = fdt_setprop_inplace(fdt, node, "linux,uefi-mmap-desc-ver",
	176	&fdt_val32, sizeof(fdt_val32));
	177	if (err)
	178	return EFI_LOAD_ERROR;
	179
	180	return EFI_SUCCESS;
	181	}
	182
263b4a30 RF	183	#ifndef EFI_FDT_ALIGN
	184	#define EFI_FDT_ALIGN EFI_PAGE_SIZE
	185	#endif
	186
ed9cc156 JH	187	struct exit_boot_struct {
	188	efi_memory_desc_t *runtime_map;
	189	int *runtime_entry_count;
c8f325a5	190	void *new_fdt_addr;
ed9cc156 JH	191	};
	192
	193	static efi_status_t exit_boot_func(efi_system_table_t *sys_table_arg,
	194	struct efi_boot_memmap *map,
	195	void *priv)
	196	{
	197	struct exit_boot_struct *p = priv;
	198	/*
	199	* Update the memory map with virtual addresses. The function will also
	200	* populate @runtime_map with copies of just the EFI_MEMORY_RUNTIME
	201	* entries so that we can pass it straight to SetVirtualAddressMap()
	202	*/
	203	efi_get_virtmap(map->map, map->map_size, *map->desc_size,
	204	p->runtime_map, p->runtime_entry_count);
	205
c8f325a5	206	return update_fdt_memmap(p->new_fdt_addr, map);
ed9cc156 JH	207	}
ed9cc156 JH	208
263b4a30 RF	209	/*
	210	* Allocate memory for a new FDT, then add EFI, commandline, and
	211	* initrd related fields to the FDT. This routine increases the
	212	* FDT allocation size until the allocated memory is large
	213	* enough. EFI allocations are in EFI_PAGE_SIZE granules,
	214	* which are fixed at 4K bytes, so in most cases the first
	215	* allocation should succeed.
	216	* EFI boot services are exited at the end of this function.
	217	* There must be no allocations between the get_memory_map()
	218	* call and the exit_boot_services() call, so the exiting of
	219	* boot services is very tightly tied to the creation of the FDT
	220	* with the final memory map in it.
	221	*/
	222
	223	efi_status_t allocate_new_fdt_and_exit_boot(efi_system_table_t *sys_table,
	224	void *handle,
	225	unsigned long *new_fdt_addr,
	226	unsigned long max_addr,
	227	u64 initrd_addr, u64 initrd_size,
	228	char *cmdline_ptr,
	229	unsigned long fdt_addr,
	230	unsigned long fdt_size)
	231	{
dadb57ab	232	unsigned long map_size, desc_size, buff_size;
263b4a30 RF	233	u32 desc_ver;
263b4a30 RF	234	unsigned long mmap_key;
f3cdfd23	235	efi_memory_desc_t memory_map, runtime_map;
263b4a30 RF	236	unsigned long new_fdt_size;
263b4a30 RF	237	efi_status_t status;
f3cdfd23	238	int runtime_entry_count = 0;
dadb57ab	239	struct efi_boot_memmap map;
ed9cc156	240	struct exit_boot_struct priv;
dadb57ab JH	241
	242	map.map = &runtime_map;
	243	map.map_size = &map_size;
	244	map.desc_size = &desc_size;
	245	map.desc_ver = &desc_ver;
	246	map.key_ptr = &mmap_key;
	247	map.buff_size = &buff_size;
f3cdfd23 AB	248
	249	/*
	250	* Get a copy of the current memory map that we will use to prepare
	251	* the input for SetVirtualAddressMap(). We don't have to worry about
	252	* subsequent allocations adding entries, since they could not affect
	253	* the number of EFI_MEMORY_RUNTIME regions.
	254	*/
dadb57ab	255	status = efi_get_memory_map(sys_table, &map);
f3cdfd23 AB	256	if (status != EFI_SUCCESS) {
	257	pr_efi_err(sys_table, "Unable to retrieve UEFI memory map.\n");
	258	return status;
	259	}
	260
	261	pr_efi(sys_table,
	262	"Exiting boot services and installing virtual address map...\n");
263b4a30	263
dadb57ab	264	map.map = &memory_map;
263b4a30 RF	265	/*
	266	* Estimate size of new FDT, and allocate memory for it. We
	267	* will allocate a bigger buffer if this ends up being too
	268	* small, so a rough guess is OK here.
	269	*/
	270	new_fdt_size = fdt_size + EFI_PAGE_SIZE;
	271	while (1) {
	272	status = efi_high_alloc(sys_table, new_fdt_size, EFI_FDT_ALIGN,
	273	new_fdt_addr, max_addr);
	274	if (status != EFI_SUCCESS) {
	275	pr_efi_err(sys_table, "Unable to allocate memory for new device tree.\n");
	276	goto fail;
	277	}
	278
263b4a30 RF	279	status = update_fdt(sys_table,
	280	(void *)fdt_addr, fdt_size,
	281	(void )new_fdt_addr, new_fdt_size,
abfb7b68	282	cmdline_ptr, initrd_addr, initrd_size);
263b4a30 RF	283
	284	/* Succeeding the first time is the expected case. */
	285	if (status == EFI_SUCCESS)
	286	break;
	287
	288	if (status == EFI_BUFFER_TOO_SMALL) {
	289	/*
	290	* We need to allocate more space for the new
	291	* device tree, so free existing buffer that is
abfb7b68	292	* too small.
263b4a30 RF	293	*/
263b4a30 RF	294	efi_free(sys_table, new_fdt_size, *new_fdt_addr);
263b4a30 RF	295	new_fdt_size += EFI_PAGE_SIZE;
263b4a30 RF	296	} else {
e3d132d1	297	pr_efi_err(sys_table, "Unable to construct new device tree.\n");
abfb7b68	298	goto fail_free_new_fdt;
263b4a30 RF	299	}
	300	}
	301
ed9cc156 JH	302	priv.runtime_map = runtime_map;
ed9cc156 JH	303	priv.runtime_entry_count = &runtime_entry_count;
c8f325a5	304	priv.new_fdt_addr = (void )new_fdt_addr;
ed9cc156 JH	305	status = efi_exit_boot_services(sys_table, handle, &map, &priv,
ed9cc156 JH	306	exit_boot_func);
263b4a30	307
f3cdfd23 AB	308	if (status == EFI_SUCCESS) {
f3cdfd23 AB	309	efi_set_virtual_address_map_t *svam;
263b4a30	310
f3cdfd23 AB	311	/* Install the new virtual address map */
	312	svam = sys_table->runtime->set_virtual_address_map;
	313	status = svam(runtime_entry_count * desc_size, desc_size,
	314	desc_ver, runtime_map);
	315
	316	/*
	317	* We are beyond the point of no return here, so if the call to
	318	* SetVirtualAddressMap() failed, we need to signal that to the
	319	* incoming kernel but proceed normally otherwise.
	320	*/
	321	if (status != EFI_SUCCESS) {
	322	int l;
	323
	324	/*
	325	* Set the virtual address field of all
	326	* EFI_MEMORY_RUNTIME entries to 0. This will signal
	327	* the incoming kernel that no virtual translation has
	328	* been installed.
	329	*/
	330	for (l = 0; l < map_size; l += desc_size) {
	331	efi_memory_desc_t p = (void )memory_map + l;
	332
	333	if (p->attribute & EFI_MEMORY_RUNTIME)
	334	p->virt_addr = 0;
	335	}
	336	}
	337	return EFI_SUCCESS;
	338	}
263b4a30 RF	339
	340	pr_efi_err(sys_table, "Exit boot services failed.\n");
	341
263b4a30 RF	342	fail_free_new_fdt:
	343	efi_free(sys_table, new_fdt_size, *new_fdt_addr);
	344
	345	fail:
f3cdfd23	346	sys_table->boottime->free_pool(runtime_map);
263b4a30 RF	347	return EFI_LOAD_ERROR;
	348	}
	349
a643375f	350	void get_fdt(efi_system_table_t sys_table, unsigned long *fdt_size)
263b4a30 RF	351	{
	352	efi_guid_t fdt_guid = DEVICE_TREE_GUID;
	353	efi_config_table_t *tables;
	354	void *fdt;
	355	int i;
	356
	357	tables = (efi_config_table_t *) sys_table->tables;
	358	fdt = NULL;
	359
	360	for (i = 0; i < sys_table->nr_tables; i++)
	361	if (efi_guidcmp(tables[i].guid, fdt_guid) == 0) {
	362	fdt = (void *) tables[i].table;
a643375f AB	363	if (fdt_check_header(fdt) != 0) {
	364	pr_efi_err(sys_table, "Invalid header detected on UEFI supplied FDT, ignoring ...\n");
	365	return NULL;
	366	}
	367	*fdt_size = fdt_totalsize(fdt);
263b4a30 RF	368	break;
	369	}
	370
	371	return fdt;
	372	}