[people/ms/linux.git] / drivers / firmware / efi / efi.c

/*
 * efi.c - EFI subsystem
 *
 * Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@dell.com>
 * Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@intel.com>
 * Copyright (C) 2013 Tom Gundersen <teg@jklm.no>
 *
 * This code registers /sys/firmware/efi{,/efivars} when EFI is supported,
 * allowing the efivarfs to be mounted or the efivars module to be loaded.
 * The existance of /sys/firmware/efi may also be used by userspace to
 * determine that the system supports EFI.
 *
 * This file is released under the GPLv2.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kobject.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/efi.h>
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/io.h>

struct efi __read_mostly efi = {
	.mps        = EFI_INVALID_TABLE_ADDR,
	.acpi       = EFI_INVALID_TABLE_ADDR,
	.acpi20     = EFI_INVALID_TABLE_ADDR,
	.smbios     = EFI_INVALID_TABLE_ADDR,
	.sal_systab = EFI_INVALID_TABLE_ADDR,
	.boot_info  = EFI_INVALID_TABLE_ADDR,
	.hcdp       = EFI_INVALID_TABLE_ADDR,
	.uga        = EFI_INVALID_TABLE_ADDR,
	.uv_systab  = EFI_INVALID_TABLE_ADDR,
	.fw_vendor  = EFI_INVALID_TABLE_ADDR,
	.runtime    = EFI_INVALID_TABLE_ADDR,
	.config_table  = EFI_INVALID_TABLE_ADDR,
};
EXPORT_SYMBOL(efi);

static struct kobject *efi_kobj;
static struct kobject *efivars_kobj;

/*
 * Let's not leave out systab information that snuck into
 * the efivars driver
 */
static ssize_t systab_show(struct kobject *kobj,
			   struct kobj_attribute *attr, char *buf)
{
	char *str = buf;

	if (!kobj || !buf)
		return -EINVAL;

	if (efi.mps != EFI_INVALID_TABLE_ADDR)
		str += sprintf(str, "MPS=0x%lx\n", efi.mps);
	if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
		str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20);
	if (efi.acpi != EFI_INVALID_TABLE_ADDR)
		str += sprintf(str, "ACPI=0x%lx\n", efi.acpi);
	if (efi.smbios != EFI_INVALID_TABLE_ADDR)
		str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios);
	if (efi.hcdp != EFI_INVALID_TABLE_ADDR)
		str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp);
	if (efi.boot_info != EFI_INVALID_TABLE_ADDR)
		str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info);
	if (efi.uga != EFI_INVALID_TABLE_ADDR)
		str += sprintf(str, "UGA=0x%lx\n", efi.uga);

	return str - buf;
}

static struct kobj_attribute efi_attr_systab =
			__ATTR(systab, 0400, systab_show, NULL);

#define EFI_FIELD(var) efi.var

#define EFI_ATTR_SHOW(name) \
static ssize_t name##_show(struct kobject *kobj, \
				struct kobj_attribute *attr, char *buf) \
{ \
	return sprintf(buf, "0x%lx\n", EFI_FIELD(name)); \
}

EFI_ATTR_SHOW(fw_vendor);
EFI_ATTR_SHOW(runtime);
EFI_ATTR_SHOW(config_table);

static struct kobj_attribute efi_attr_fw_vendor = __ATTR_RO(fw_vendor);
static struct kobj_attribute efi_attr_runtime = __ATTR_RO(runtime);
static struct kobj_attribute efi_attr_config_table = __ATTR_RO(config_table);

static struct attribute *efi_subsys_attrs[] = {
	&efi_attr_systab.attr,
	&efi_attr_fw_vendor.attr,
	&efi_attr_runtime.attr,
	&efi_attr_config_table.attr,
	NULL,
};

static umode_t efi_attr_is_visible(struct kobject *kobj,
				   struct attribute *attr, int n)
{
	umode_t mode = attr->mode;

	if (attr == &efi_attr_fw_vendor.attr)
		return (efi.fw_vendor == EFI_INVALID_TABLE_ADDR) ? 0 : mode;
	else if (attr == &efi_attr_runtime.attr)
		return (efi.runtime == EFI_INVALID_TABLE_ADDR) ? 0 : mode;
	else if (attr == &efi_attr_config_table.attr)
		return (efi.config_table == EFI_INVALID_TABLE_ADDR) ? 0 : mode;

	return mode;
}

static struct attribute_group efi_subsys_attr_group = {
	.attrs = efi_subsys_attrs,
	.is_visible = efi_attr_is_visible,
};

static struct efivars generic_efivars;
static struct efivar_operations generic_ops;

static int generic_ops_register(void)
{
	generic_ops.get_variable = efi.get_variable;
	generic_ops.set_variable = efi.set_variable;
	generic_ops.get_next_variable = efi.get_next_variable;
	generic_ops.query_variable_store = efi_query_variable_store;

	return efivars_register(&generic_efivars, &generic_ops, efi_kobj);
}

static void generic_ops_unregister(void)
{
	efivars_unregister(&generic_efivars);
}

/*
 * We register the efi subsystem with the firmware subsystem and the
 * efivars subsystem with the efi subsystem, if the system was booted with
 * EFI.
 */
static int __init efisubsys_init(void)
{
	int error;

	if (!efi_enabled(EFI_BOOT))
		return 0;

	/* We register the efi directory at /sys/firmware/efi */
	efi_kobj = kobject_create_and_add("efi", firmware_kobj);
	if (!efi_kobj) {
		pr_err("efi: Firmware registration failed.\n");
		return -ENOMEM;
	}

	error = generic_ops_register();
	if (error)
		goto err_put;

	error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group);
	if (error) {
		pr_err("efi: Sysfs attribute export failed with error %d.\n",
		       error);
		goto err_unregister;
	}

	error = efi_runtime_map_init(efi_kobj);
	if (error)
		goto err_remove_group;

	/* and the standard mountpoint for efivarfs */
	efivars_kobj = kobject_create_and_add("efivars", efi_kobj);
	if (!efivars_kobj) {
		pr_err("efivars: Subsystem registration failed.\n");
		error = -ENOMEM;
		goto err_remove_group;
	}

	return 0;

err_remove_group:
	sysfs_remove_group(efi_kobj, &efi_subsys_attr_group);
err_unregister:
	generic_ops_unregister();
err_put:
	kobject_put(efi_kobj);
	return error;
}

subsys_initcall(efisubsys_init);


/*
 * We can't ioremap data in EFI boot services RAM, because we've already mapped
 * it as RAM.  So, look it up in the existing EFI memory map instead.  Only
 * callable after efi_enter_virtual_mode and before efi_free_boot_services.
 */
void __iomem *efi_lookup_mapped_addr(u64 phys_addr)
{
	struct efi_memory_map *map;
	void *p;
	map = efi.memmap;
	if (!map)
		return NULL;
	if (WARN_ON(!map->map))
		return NULL;
	for (p = map->map; p < map->map_end; p += map->desc_size) {
		efi_memory_desc_t *md = p;
		u64 size = md->num_pages << EFI_PAGE_SHIFT;
		u64 end = md->phys_addr + size;
		if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
		    md->type != EFI_BOOT_SERVICES_CODE &&
		    md->type != EFI_BOOT_SERVICES_DATA)
			continue;
		if (!md->virt_addr)
			continue;
		if (phys_addr >= md->phys_addr && phys_addr < end) {
			phys_addr += md->virt_addr - md->phys_addr;
			return (__force void __iomem *)(unsigned long)phys_addr;
		}
	}
	return NULL;
}

static __initdata efi_config_table_type_t common_tables[] = {
	{ACPI_20_TABLE_GUID, "ACPI 2.0", &efi.acpi20},
	{ACPI_TABLE_GUID, "ACPI", &efi.acpi},
	{HCDP_TABLE_GUID, "HCDP", &efi.hcdp},
	{MPS_TABLE_GUID, "MPS", &efi.mps},
	{SAL_SYSTEM_TABLE_GUID, "SALsystab", &efi.sal_systab},
	{SMBIOS_TABLE_GUID, "SMBIOS", &efi.smbios},
	{UGA_IO_PROTOCOL_GUID, "UGA", &efi.uga},
	{NULL_GUID, NULL, NULL},
};

static __init int match_config_table(efi_guid_t *guid,
				     unsigned long table,
				     efi_config_table_type_t *table_types)
{
	u8 str[EFI_VARIABLE_GUID_LEN + 1];
	int i;

	if (table_types) {
		efi_guid_unparse(guid, str);

		for (i = 0; efi_guidcmp(table_types[i].guid, NULL_GUID); i++) {
			efi_guid_unparse(&table_types[i].guid, str);

			if (!efi_guidcmp(*guid, table_types[i].guid)) {
				*(table_types[i].ptr) = table;
				pr_cont(" %s=0x%lx ",
					table_types[i].name, table);
				return 1;
			}
		}
	}

	return 0;
}

int __init efi_config_init(efi_config_table_type_t *arch_tables)
{
	void *config_tables, *tablep;
	int i, sz;

	if (efi_enabled(EFI_64BIT))
		sz = sizeof(efi_config_table_64_t);
	else
		sz = sizeof(efi_config_table_32_t);

	/*
	 * Let's see what config tables the firmware passed to us.
	 */
	config_tables = early_memremap(efi.systab->tables,
				       efi.systab->nr_tables * sz);
	if (config_tables == NULL) {
		pr_err("Could not map Configuration table!\n");
		return -ENOMEM;
	}

	tablep = config_tables;
	pr_info("");
	for (i = 0; i < efi.systab->nr_tables; i++) {
		efi_guid_t guid;
		unsigned long table;

		if (efi_enabled(EFI_64BIT)) {
			u64 table64;
			guid = ((efi_config_table_64_t *)tablep)->guid;
			table64 = ((efi_config_table_64_t *)tablep)->table;
			table = table64;
#ifndef CONFIG_64BIT
			if (table64 >> 32) {
				pr_cont("\n");
				pr_err("Table located above 4GB, disabling EFI.\n");
				early_iounmap(config_tables,
					       efi.systab->nr_tables * sz);
				return -EINVAL;
			}
#endif
		} else {
			guid = ((efi_config_table_32_t *)tablep)->guid;
			table = ((efi_config_table_32_t *)tablep)->table;
		}

		if (!match_config_table(&guid, table, common_tables))
			match_config_table(&guid, table, arch_tables);

		tablep += sz;
	}
	pr_cont("\n");
	early_iounmap(config_tables, efi.systab->nr_tables * sz);

	set_bit(EFI_CONFIG_TABLES, &efi.flags);

	return 0;
}

#ifdef CONFIG_EFI_PARAMS_FROM_FDT

#define UEFI_PARAM(name, prop, field)			   \
	{						   \
		{ name },				   \
		{ prop },				   \
		offsetof(struct efi_fdt_params, field),    \
		FIELD_SIZEOF(struct efi_fdt_params, field) \
	}

static __initdata struct {
	const char name[32];
	const char propname[32];
	int offset;
	int size;
} dt_params[] = {
	UEFI_PARAM("System Table", "linux,uefi-system-table", system_table),
	UEFI_PARAM("MemMap Address", "linux,uefi-mmap-start", mmap),
	UEFI_PARAM("MemMap Size", "linux,uefi-mmap-size", mmap_size),
	UEFI_PARAM("MemMap Desc. Size", "linux,uefi-mmap-desc-size", desc_size),
	UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver)
};

struct param_info {
	int verbose;
	void *params;
};

static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
				       int depth, void *data)
{
	struct param_info *info = data;
	void *prop, *dest;
	unsigned long len;
	u64 val;
	int i;

	if (depth != 1 ||
	    (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
		return 0;

	pr_info("Getting parameters from FDT:\n");

	for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
		prop = of_get_flat_dt_prop(node, dt_params[i].propname, &len);
		if (!prop) {
			pr_err("Can't find %s in device tree!\n",
			       dt_params[i].name);
			return 0;
		}
		dest = info->params + dt_params[i].offset;

		val = of_read_number(prop, len / sizeof(u32));

		if (dt_params[i].size == sizeof(u32))
			*(u32 *)dest = val;
		else
			*(u64 *)dest = val;

		if (info->verbose)
			pr_info("  %s: 0x%0*llx\n", dt_params[i].name,
				dt_params[i].size * 2, val);
	}
	return 1;
}

int __init efi_get_fdt_params(struct efi_fdt_params *params, int verbose)
{
	struct param_info info;

	info.verbose = verbose;
	info.params = params;

	return of_scan_flat_dt(fdt_find_uefi_params, &info);
}
#endif /* CONFIG_EFI_PARAMS_FROM_FDT */
Commit	Line	Data
a9499fa7 TG	1	/*
	2	* efi.c - EFI subsystem
	3	*
	4	* Copyright (C) 2001,2003,2004 Dell <Matt_Domsch@dell.com>
	5	* Copyright (C) 2004 Intel Corporation <matthew.e.tolentino@intel.com>
	6	* Copyright (C) 2013 Tom Gundersen <teg@jklm.no>
	7	*
	8	* This code registers /sys/firmware/efi{,/efivars} when EFI is supported,
	9	* allowing the efivarfs to be mounted or the efivars module to be loaded.
	10	* The existance of /sys/firmware/efi may also be used by userspace to
	11	* determine that the system supports EFI.
	12	*
	13	* This file is released under the GPLv2.
	14	*/
	15
272686bf LL	16	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
272686bf LL	17
a9499fa7 TG	18	#include <linux/kobject.h>
	19	#include <linux/module.h>
	20	#include <linux/init.h>
	21	#include <linux/device.h>
	22	#include <linux/efi.h>
0302f71c MS	23	#include <linux/of.h>
0302f71c MS	24	#include <linux/of_fdt.h>
272686bf LL	25	#include <linux/io.h>
	26
	27	struct efi __read_mostly efi = {
	28	.mps = EFI_INVALID_TABLE_ADDR,
	29	.acpi = EFI_INVALID_TABLE_ADDR,
	30	.acpi20 = EFI_INVALID_TABLE_ADDR,
	31	.smbios = EFI_INVALID_TABLE_ADDR,
	32	.sal_systab = EFI_INVALID_TABLE_ADDR,
	33	.boot_info = EFI_INVALID_TABLE_ADDR,
	34	.hcdp = EFI_INVALID_TABLE_ADDR,
	35	.uga = EFI_INVALID_TABLE_ADDR,
	36	.uv_systab = EFI_INVALID_TABLE_ADDR,
a0998eb1 DY	37	.fw_vendor = EFI_INVALID_TABLE_ADDR,
	38	.runtime = EFI_INVALID_TABLE_ADDR,
	39	.config_table = EFI_INVALID_TABLE_ADDR,
272686bf LL	40	};
272686bf LL	41	EXPORT_SYMBOL(efi);
a9499fa7 TG	42
	43	static struct kobject *efi_kobj;
	44	static struct kobject *efivars_kobj;
	45
	46	/*
	47	* Let's not leave out systab information that snuck into
	48	* the efivars driver
	49	*/
	50	static ssize_t systab_show(struct kobject *kobj,
	51	struct kobj_attribute attr, char buf)
	52	{
	53	char *str = buf;
	54
	55	if (!kobj \|\| !buf)
	56	return -EINVAL;
	57
	58	if (efi.mps != EFI_INVALID_TABLE_ADDR)
	59	str += sprintf(str, "MPS=0x%lx\n", efi.mps);
	60	if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
	61	str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20);
	62	if (efi.acpi != EFI_INVALID_TABLE_ADDR)
	63	str += sprintf(str, "ACPI=0x%lx\n", efi.acpi);
	64	if (efi.smbios != EFI_INVALID_TABLE_ADDR)
	65	str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios);
	66	if (efi.hcdp != EFI_INVALID_TABLE_ADDR)
	67	str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp);
	68	if (efi.boot_info != EFI_INVALID_TABLE_ADDR)
	69	str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info);
	70	if (efi.uga != EFI_INVALID_TABLE_ADDR)
	71	str += sprintf(str, "UGA=0x%lx\n", efi.uga);
	72
	73	return str - buf;
	74	}
	75
	76	static struct kobj_attribute efi_attr_systab =
	77	__ATTR(systab, 0400, systab_show, NULL);
	78
a0998eb1 DY	79	#define EFI_FIELD(var) efi.var
	80
	81	#define EFI_ATTR_SHOW(name) \
	82	static ssize_t name##_show(struct kobject *kobj, \
	83	struct kobj_attribute attr, char buf) \
	84	{ \
	85	return sprintf(buf, "0x%lx\n", EFI_FIELD(name)); \
	86	}
	87
	88	EFI_ATTR_SHOW(fw_vendor);
	89	EFI_ATTR_SHOW(runtime);
	90	EFI_ATTR_SHOW(config_table);
	91
	92	static struct kobj_attribute efi_attr_fw_vendor = __ATTR_RO(fw_vendor);
	93	static struct kobj_attribute efi_attr_runtime = __ATTR_RO(runtime);
	94	static struct kobj_attribute efi_attr_config_table = __ATTR_RO(config_table);
	95
a9499fa7 TG	96	static struct attribute *efi_subsys_attrs[] = {
a9499fa7 TG	97	&efi_attr_systab.attr,
a0998eb1 DY	98	&efi_attr_fw_vendor.attr,
	99	&efi_attr_runtime.attr,
	100	&efi_attr_config_table.attr,
	101	NULL,
a9499fa7 TG	102	};
a9499fa7 TG	103
a0998eb1 DY	104	static umode_t efi_attr_is_visible(struct kobject *kobj,
	105	struct attribute *attr, int n)
	106	{
	107	umode_t mode = attr->mode;
	108
	109	if (attr == &efi_attr_fw_vendor.attr)
	110	return (efi.fw_vendor == EFI_INVALID_TABLE_ADDR) ? 0 : mode;
	111	else if (attr == &efi_attr_runtime.attr)
	112	return (efi.runtime == EFI_INVALID_TABLE_ADDR) ? 0 : mode;
	113	else if (attr == &efi_attr_config_table.attr)
	114	return (efi.config_table == EFI_INVALID_TABLE_ADDR) ? 0 : mode;
	115
	116	return mode;
	117	}
	118
a9499fa7 TG	119	static struct attribute_group efi_subsys_attr_group = {
a9499fa7 TG	120	.attrs = efi_subsys_attrs,
a0998eb1	121	.is_visible = efi_attr_is_visible,
a9499fa7 TG	122	};
	123
	124	static struct efivars generic_efivars;
	125	static struct efivar_operations generic_ops;
	126
	127	static int generic_ops_register(void)
	128	{
	129	generic_ops.get_variable = efi.get_variable;
	130	generic_ops.set_variable = efi.set_variable;
	131	generic_ops.get_next_variable = efi.get_next_variable;
a614e192	132	generic_ops.query_variable_store = efi_query_variable_store;
a9499fa7 TG	133
	134	return efivars_register(&generic_efivars, &generic_ops, efi_kobj);
	135	}
	136
	137	static void generic_ops_unregister(void)
	138	{
	139	efivars_unregister(&generic_efivars);
	140	}
	141
	142	/*
	143	* We register the efi subsystem with the firmware subsystem and the
	144	* efivars subsystem with the efi subsystem, if the system was booted with
	145	* EFI.
	146	*/
	147	static int __init efisubsys_init(void)
	148	{
	149	int error;
	150
	151	if (!efi_enabled(EFI_BOOT))
	152	return 0;
	153
	154	/* We register the efi directory at /sys/firmware/efi */
	155	efi_kobj = kobject_create_and_add("efi", firmware_kobj);
	156	if (!efi_kobj) {
	157	pr_err("efi: Firmware registration failed.\n");
	158	return -ENOMEM;
	159	}
	160
	161	error = generic_ops_register();
	162	if (error)
	163	goto err_put;
	164
	165	error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group);
	166	if (error) {
	167	pr_err("efi: Sysfs attribute export failed with error %d.\n",
	168	error);
	169	goto err_unregister;
	170	}
	171
926172d4 DY	172	error = efi_runtime_map_init(efi_kobj);
	173	if (error)
	174	goto err_remove_group;
	175
a9499fa7 TG	176	/* and the standard mountpoint for efivarfs */
	177	efivars_kobj = kobject_create_and_add("efivars", efi_kobj);
	178	if (!efivars_kobj) {
	179	pr_err("efivars: Subsystem registration failed.\n");
	180	error = -ENOMEM;
	181	goto err_remove_group;
	182	}
	183
	184	return 0;
	185
	186	err_remove_group:
	187	sysfs_remove_group(efi_kobj, &efi_subsys_attr_group);
	188	err_unregister:
	189	generic_ops_unregister();
	190	err_put:
	191	kobject_put(efi_kobj);
	192	return error;
	193	}
	194
	195	subsys_initcall(efisubsys_init);
272686bf LL	196
272686bf LL	197
258f6fd7 LL	198	/*
	199	* We can't ioremap data in EFI boot services RAM, because we've already mapped
	200	* it as RAM. So, look it up in the existing EFI memory map instead. Only
	201	* callable after efi_enter_virtual_mode and before efi_free_boot_services.
	202	*/
	203	void __iomem *efi_lookup_mapped_addr(u64 phys_addr)
	204	{
	205	struct efi_memory_map *map;
	206	void *p;
	207	map = efi.memmap;
	208	if (!map)
	209	return NULL;
	210	if (WARN_ON(!map->map))
	211	return NULL;
	212	for (p = map->map; p < map->map_end; p += map->desc_size) {
	213	efi_memory_desc_t *md = p;
	214	u64 size = md->num_pages << EFI_PAGE_SHIFT;
	215	u64 end = md->phys_addr + size;
	216	if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
	217	md->type != EFI_BOOT_SERVICES_CODE &&
	218	md->type != EFI_BOOT_SERVICES_DATA)
	219	continue;
	220	if (!md->virt_addr)
	221	continue;
	222	if (phys_addr >= md->phys_addr && phys_addr < end) {
	223	phys_addr += md->virt_addr - md->phys_addr;
	224	return (__force void __iomem *)(unsigned long)phys_addr;
	225	}
	226	}
	227	return NULL;
	228	}
	229
272686bf LL	230	static __initdata efi_config_table_type_t common_tables[] = {
	231	{ACPI_20_TABLE_GUID, "ACPI 2.0", &efi.acpi20},
	232	{ACPI_TABLE_GUID, "ACPI", &efi.acpi},
	233	{HCDP_TABLE_GUID, "HCDP", &efi.hcdp},
	234	{MPS_TABLE_GUID, "MPS", &efi.mps},
	235	{SAL_SYSTEM_TABLE_GUID, "SALsystab", &efi.sal_systab},
	236	{SMBIOS_TABLE_GUID, "SMBIOS", &efi.smbios},
	237	{UGA_IO_PROTOCOL_GUID, "UGA", &efi.uga},
69e60841	238	{NULL_GUID, NULL, NULL},
272686bf LL	239	};
	240
	241	static __init int match_config_table(efi_guid_t *guid,
	242	unsigned long table,
	243	efi_config_table_type_t *table_types)
	244	{
	245	u8 str[EFI_VARIABLE_GUID_LEN + 1];
	246	int i;
	247
	248	if (table_types) {
	249	efi_guid_unparse(guid, str);
	250
	251	for (i = 0; efi_guidcmp(table_types[i].guid, NULL_GUID); i++) {
	252	efi_guid_unparse(&table_types[i].guid, str);
	253
	254	if (!efi_guidcmp(*guid, table_types[i].guid)) {
	255	*(table_types[i].ptr) = table;
	256	pr_cont(" %s=0x%lx ",
	257	table_types[i].name, table);
	258	return 1;
	259	}
	260	}
	261	}
	262
	263	return 0;
	264	}
	265
	266	int __init efi_config_init(efi_config_table_type_t *arch_tables)
	267	{
	268	void config_tables, tablep;
	269	int i, sz;
	270
	271	if (efi_enabled(EFI_64BIT))
	272	sz = sizeof(efi_config_table_64_t);
	273	else
	274	sz = sizeof(efi_config_table_32_t);
	275
	276	/*
	277	* Let's see what config tables the firmware passed to us.
	278	*/
	279	config_tables = early_memremap(efi.systab->tables,
	280	efi.systab->nr_tables * sz);
	281	if (config_tables == NULL) {
	282	pr_err("Could not map Configuration table!\n");
	283	return -ENOMEM;
	284	}
	285
	286	tablep = config_tables;
	287	pr_info("");
	288	for (i = 0; i < efi.systab->nr_tables; i++) {
	289	efi_guid_t guid;
	290	unsigned long table;
	291
	292	if (efi_enabled(EFI_64BIT)) {
	293	u64 table64;
	294	guid = ((efi_config_table_64_t *)tablep)->guid;
	295	table64 = ((efi_config_table_64_t *)tablep)->table;
	296	table = table64;
	297	#ifndef CONFIG_64BIT
	298	if (table64 >> 32) {
	299	pr_cont("\n");
	300	pr_err("Table located above 4GB, disabling EFI.\n");
	301	early_iounmap(config_tables,
	302	efi.systab->nr_tables * sz);
303	return -EINVAL;
304	}
305	#endif
306	} else {
307	guid = ((efi_config_table_32_t *)tablep)->guid;
308	table = ((efi_config_table_32_t *)tablep)->table;
309	}
310
311	if (!match_config_table(&guid, table, common_tables))
312	match_config_table(&guid, table, arch_tables);
313
314	tablep += sz;
315	}
316	pr_cont("\n");
317	early_iounmap(config_tables, efi.systab->nr_tables * sz);
0f8093a9 MF	318
	319	set_bit(EFI_CONFIG_TABLES, &efi.flags);
	320
272686bf LL	321	return 0;
272686bf LL	322	}
0302f71c MS	323
	324	#ifdef CONFIG_EFI_PARAMS_FROM_FDT
	325
	326	#define UEFI_PARAM(name, prop, field) \
	327	{ \
	328	{ name }, \
	329	{ prop }, \
	330	offsetof(struct efi_fdt_params, field), \
	331	FIELD_SIZEOF(struct efi_fdt_params, field) \
	332	}
	333
	334	static __initdata struct {
	335	const char name[32];
	336	const char propname[32];
	337	int offset;
	338	int size;
	339	} dt_params[] = {
	340	UEFI_PARAM("System Table", "linux,uefi-system-table", system_table),
	341	UEFI_PARAM("MemMap Address", "linux,uefi-mmap-start", mmap),
	342	UEFI_PARAM("MemMap Size", "linux,uefi-mmap-size", mmap_size),
	343	UEFI_PARAM("MemMap Desc. Size", "linux,uefi-mmap-desc-size", desc_size),
	344	UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver)
	345	};
	346
	347	struct param_info {
	348	int verbose;
	349	void *params;
	350	};
	351
	352	static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
	353	int depth, void *data)
	354	{
	355	struct param_info *info = data;
	356	void prop, dest;
	357	unsigned long len;
	358	u64 val;
	359	int i;
	360
	361	if (depth != 1 \|\|
	362	(strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
	363	return 0;
	364
	365	pr_info("Getting parameters from FDT:\n");
	366
	367	for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
	368	prop = of_get_flat_dt_prop(node, dt_params[i].propname, &len);
	369	if (!prop) {
	370	pr_err("Can't find %s in device tree!\n",
	371	dt_params[i].name);
	372	return 0;
	373	}
	374	dest = info->params + dt_params[i].offset;
	375
	376	val = of_read_number(prop, len / sizeof(u32));
	377
	378	if (dt_params[i].size == sizeof(u32))
	379	(u32 )dest = val;
	380	else
	381	(u64 )dest = val;
	382
	383	if (info->verbose)
	384	pr_info(" %s: 0x%0*llx\n", dt_params[i].name,
	385	dt_params[i].size * 2, val);
	386	}
387	return 1;
388	}
389
390	int __init efi_get_fdt_params(struct efi_fdt_params *params, int verbose)
391	{
392	struct param_info info;
393
394	info.verbose = verbose;
395	info.params = params;
396
397	return of_scan_flat_dt(fdt_find_uefi_params, &info);
398	}
399	#endif /* CONFIG_EFI_PARAMS_FROM_FDT */