[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>
#include <linux/platform_device.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 bool disable_runtime;
static int __init setup_noefi(char *arg)
{
	disable_runtime = true;
	return 0;
}
early_param("noefi", setup_noefi);

bool efi_runtime_disabled(void)
{
	return disable_runtime;
}

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)
{
	if (attr == &efi_attr_fw_vendor.attr) {
		if (efi_enabled(EFI_PARAVIRT) ||
				efi.fw_vendor == EFI_INVALID_TABLE_ADDR)
			return 0;
	} else if (attr == &efi_attr_runtime.attr) {
		if (efi.runtime == EFI_INVALID_TABLE_ADDR)
			return 0;
	} else if (attr == &efi_attr_config_table.attr) {
		if (efi.config_table == EFI_INVALID_TABLE_ADDR)
			return 0;
	}

	return attr->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_memunmap(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_memunmap(config_tables, efi.systab->nr_tables * sz);

	set_bit(EFI_CONFIG_TABLES, &efi.flags);

	return 0;
}

#ifdef CONFIG_EFI_VARS_MODULE
static int __init efi_load_efivars(void)
{
	struct platform_device *pdev;

	if (!efi_enabled(EFI_RUNTIME_SERVICES))
		return 0;

	pdev = platform_device_register_simple("efivars", 0, NULL, 0);
	return IS_ERR(pdev) ? PTR_ERR(pdev) : 0;
}
device_initcall(efi_load_efivars);
#endif

#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;
	int found;
	void *params;
};

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

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

	for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
		prop = of_get_flat_dt_prop(node, dt_params[i].propname, &len);
		if (!prop)
			return 0;
		dest = info->params + dt_params[i].offset;
		info->found++;

		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;
	int ret;

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

	info.verbose = verbose;
	info.found = 0;
	info.params = params;

	ret = of_scan_flat_dt(fdt_find_uefi_params, &info);
	if (!info.found)
		pr_info("UEFI not found.\n");
	else if (!ret)
		pr_err("Can't find '%s' in device tree!\n",
		       dt_params[info.found].name);

	return ret;
}
#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	25	#include <linux/io.h>
28d54022	26	#include <linux/platform_device.h>
272686bf LL	27
	28	struct efi __read_mostly efi = {
	29	.mps = EFI_INVALID_TABLE_ADDR,
	30	.acpi = EFI_INVALID_TABLE_ADDR,
	31	.acpi20 = EFI_INVALID_TABLE_ADDR,
	32	.smbios = EFI_INVALID_TABLE_ADDR,
	33	.sal_systab = EFI_INVALID_TABLE_ADDR,
	34	.boot_info = EFI_INVALID_TABLE_ADDR,
	35	.hcdp = EFI_INVALID_TABLE_ADDR,
	36	.uga = EFI_INVALID_TABLE_ADDR,
	37	.uv_systab = EFI_INVALID_TABLE_ADDR,
a0998eb1 DY	38	.fw_vendor = EFI_INVALID_TABLE_ADDR,
	39	.runtime = EFI_INVALID_TABLE_ADDR,
	40	.config_table = EFI_INVALID_TABLE_ADDR,
272686bf LL	41	};
272686bf LL	42	EXPORT_SYMBOL(efi);
a9499fa7	43
b2e0a54a DY	44	static bool disable_runtime;
	45	static int __init setup_noefi(char *arg)
	46	{
	47	disable_runtime = true;
	48	return 0;
	49	}
	50	early_param("noefi", setup_noefi);
	51
	52	bool efi_runtime_disabled(void)
	53	{
	54	return disable_runtime;
	55	}
	56
a9499fa7 TG	57	static struct kobject *efi_kobj;
	58	static struct kobject *efivars_kobj;
	59
	60	/*
	61	* Let's not leave out systab information that snuck into
	62	* the efivars driver
	63	*/
	64	static ssize_t systab_show(struct kobject *kobj,
	65	struct kobj_attribute attr, char buf)
	66	{
	67	char *str = buf;
	68
	69	if (!kobj \|\| !buf)
	70	return -EINVAL;
	71
	72	if (efi.mps != EFI_INVALID_TABLE_ADDR)
	73	str += sprintf(str, "MPS=0x%lx\n", efi.mps);
	74	if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
	75	str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20);
	76	if (efi.acpi != EFI_INVALID_TABLE_ADDR)
	77	str += sprintf(str, "ACPI=0x%lx\n", efi.acpi);
	78	if (efi.smbios != EFI_INVALID_TABLE_ADDR)
	79	str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios);
	80	if (efi.hcdp != EFI_INVALID_TABLE_ADDR)
	81	str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp);
	82	if (efi.boot_info != EFI_INVALID_TABLE_ADDR)
	83	str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info);
	84	if (efi.uga != EFI_INVALID_TABLE_ADDR)
	85	str += sprintf(str, "UGA=0x%lx\n", efi.uga);
	86
	87	return str - buf;
	88	}
	89
	90	static struct kobj_attribute efi_attr_systab =
	91	__ATTR(systab, 0400, systab_show, NULL);
	92
a0998eb1 DY	93	#define EFI_FIELD(var) efi.var
	94
	95	#define EFI_ATTR_SHOW(name) \
	96	static ssize_t name##_show(struct kobject *kobj, \
	97	struct kobj_attribute attr, char buf) \
	98	{ \
	99	return sprintf(buf, "0x%lx\n", EFI_FIELD(name)); \
	100	}
	101
	102	EFI_ATTR_SHOW(fw_vendor);
	103	EFI_ATTR_SHOW(runtime);
	104	EFI_ATTR_SHOW(config_table);
	105
	106	static struct kobj_attribute efi_attr_fw_vendor = __ATTR_RO(fw_vendor);
	107	static struct kobj_attribute efi_attr_runtime = __ATTR_RO(runtime);
	108	static struct kobj_attribute efi_attr_config_table = __ATTR_RO(config_table);
	109
a9499fa7 TG	110	static struct attribute *efi_subsys_attrs[] = {
a9499fa7 TG	111	&efi_attr_systab.attr,
a0998eb1 DY	112	&efi_attr_fw_vendor.attr,
	113	&efi_attr_runtime.attr,
	114	&efi_attr_config_table.attr,
	115	NULL,
a9499fa7 TG	116	};
a9499fa7 TG	117
a0998eb1 DY	118	static umode_t efi_attr_is_visible(struct kobject *kobj,
	119	struct attribute *attr, int n)
	120	{
9f27bc54 DK	121	if (attr == &efi_attr_fw_vendor.attr) {
	122	if (efi_enabled(EFI_PARAVIRT) \|\|
	123	efi.fw_vendor == EFI_INVALID_TABLE_ADDR)
	124	return 0;
	125	} else if (attr == &efi_attr_runtime.attr) {
	126	if (efi.runtime == EFI_INVALID_TABLE_ADDR)
	127	return 0;
	128	} else if (attr == &efi_attr_config_table.attr) {
	129	if (efi.config_table == EFI_INVALID_TABLE_ADDR)
	130	return 0;
	131	}
a0998eb1	132
9f27bc54	133	return attr->mode;
a0998eb1 DY	134	}
a0998eb1 DY	135
a9499fa7 TG	136	static struct attribute_group efi_subsys_attr_group = {
a9499fa7 TG	137	.attrs = efi_subsys_attrs,
a0998eb1	138	.is_visible = efi_attr_is_visible,
a9499fa7 TG	139	};
	140
	141	static struct efivars generic_efivars;
	142	static struct efivar_operations generic_ops;
	143
	144	static int generic_ops_register(void)
	145	{
	146	generic_ops.get_variable = efi.get_variable;
	147	generic_ops.set_variable = efi.set_variable;
	148	generic_ops.get_next_variable = efi.get_next_variable;
a614e192	149	generic_ops.query_variable_store = efi_query_variable_store;
a9499fa7 TG	150
	151	return efivars_register(&generic_efivars, &generic_ops, efi_kobj);
	152	}
	153
	154	static void generic_ops_unregister(void)
	155	{
	156	efivars_unregister(&generic_efivars);
	157	}
	158
	159	/*
	160	* We register the efi subsystem with the firmware subsystem and the
	161	* efivars subsystem with the efi subsystem, if the system was booted with
	162	* EFI.
	163	*/
	164	static int __init efisubsys_init(void)
	165	{
	166	int error;
	167
	168	if (!efi_enabled(EFI_BOOT))
	169	return 0;
	170
	171	/* We register the efi directory at /sys/firmware/efi */
	172	efi_kobj = kobject_create_and_add("efi", firmware_kobj);
	173	if (!efi_kobj) {
	174	pr_err("efi: Firmware registration failed.\n");
	175	return -ENOMEM;
	176	}
	177
	178	error = generic_ops_register();
	179	if (error)
	180	goto err_put;
	181
	182	error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group);
	183	if (error) {
	184	pr_err("efi: Sysfs attribute export failed with error %d.\n",
	185	error);
	186	goto err_unregister;
	187	}
	188
926172d4 DY	189	error = efi_runtime_map_init(efi_kobj);
	190	if (error)
	191	goto err_remove_group;
	192
a9499fa7 TG	193	/* and the standard mountpoint for efivarfs */
	194	efivars_kobj = kobject_create_and_add("efivars", efi_kobj);
	195	if (!efivars_kobj) {
	196	pr_err("efivars: Subsystem registration failed.\n");
	197	error = -ENOMEM;
	198	goto err_remove_group;
	199	}
	200
	201	return 0;
	202
	203	err_remove_group:
	204	sysfs_remove_group(efi_kobj, &efi_subsys_attr_group);
	205	err_unregister:
	206	generic_ops_unregister();
	207	err_put:
	208	kobject_put(efi_kobj);
	209	return error;
	210	}
	211
	212	subsys_initcall(efisubsys_init);
272686bf LL	213
272686bf LL	214
258f6fd7 LL	215	/*
	216	* We can't ioremap data in EFI boot services RAM, because we've already mapped
	217	* it as RAM. So, look it up in the existing EFI memory map instead. Only
	218	* callable after efi_enter_virtual_mode and before efi_free_boot_services.
	219	*/
	220	void __iomem *efi_lookup_mapped_addr(u64 phys_addr)
	221	{
	222	struct efi_memory_map *map;
	223	void *p;
	224	map = efi.memmap;
	225	if (!map)
	226	return NULL;
	227	if (WARN_ON(!map->map))
	228	return NULL;
	229	for (p = map->map; p < map->map_end; p += map->desc_size) {
	230	efi_memory_desc_t *md = p;
	231	u64 size = md->num_pages << EFI_PAGE_SHIFT;
	232	u64 end = md->phys_addr + size;
	233	if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
	234	md->type != EFI_BOOT_SERVICES_CODE &&
	235	md->type != EFI_BOOT_SERVICES_DATA)
	236	continue;
	237	if (!md->virt_addr)
	238	continue;
	239	if (phys_addr >= md->phys_addr && phys_addr < end) {
	240	phys_addr += md->virt_addr - md->phys_addr;
	241	return (__force void __iomem *)(unsigned long)phys_addr;
	242	}
	243	}
	244	return NULL;
	245	}
	246
272686bf LL	247	static __initdata efi_config_table_type_t common_tables[] = {
	248	{ACPI_20_TABLE_GUID, "ACPI 2.0", &efi.acpi20},
	249	{ACPI_TABLE_GUID, "ACPI", &efi.acpi},
	250	{HCDP_TABLE_GUID, "HCDP", &efi.hcdp},
	251	{MPS_TABLE_GUID, "MPS", &efi.mps},
	252	{SAL_SYSTEM_TABLE_GUID, "SALsystab", &efi.sal_systab},
	253	{SMBIOS_TABLE_GUID, "SMBIOS", &efi.smbios},
	254	{UGA_IO_PROTOCOL_GUID, "UGA", &efi.uga},
69e60841	255	{NULL_GUID, NULL, NULL},
272686bf LL	256	};
	257
	258	static __init int match_config_table(efi_guid_t *guid,
	259	unsigned long table,
	260	efi_config_table_type_t *table_types)
	261	{
	262	u8 str[EFI_VARIABLE_GUID_LEN + 1];
	263	int i;
	264
	265	if (table_types) {
	266	efi_guid_unparse(guid, str);
	267
	268	for (i = 0; efi_guidcmp(table_types[i].guid, NULL_GUID); i++) {
	269	efi_guid_unparse(&table_types[i].guid, str);
	270
	271	if (!efi_guidcmp(*guid, table_types[i].guid)) {
	272	*(table_types[i].ptr) = table;
	273	pr_cont(" %s=0x%lx ",
	274	table_types[i].name, table);
	275	return 1;
	276	}
	277	}
	278	}
	279
	280	return 0;
	281	}
	282
	283	int __init efi_config_init(efi_config_table_type_t *arch_tables)
	284	{
	285	void config_tables, tablep;
	286	int i, sz;
	287
	288	if (efi_enabled(EFI_64BIT))
	289	sz = sizeof(efi_config_table_64_t);
	290	else
	291	sz = sizeof(efi_config_table_32_t);
	292
	293	/*
	294	* Let's see what config tables the firmware passed to us.
	295	*/
	296	config_tables = early_memremap(efi.systab->tables,
	297	efi.systab->nr_tables * sz);
	298	if (config_tables == NULL) {
	299	pr_err("Could not map Configuration table!\n");
	300	return -ENOMEM;
	301	}
	302
	303	tablep = config_tables;
	304	pr_info("");
	305	for (i = 0; i < efi.systab->nr_tables; i++) {
	306	efi_guid_t guid;
	307	unsigned long table;
	308
	309	if (efi_enabled(EFI_64BIT)) {
	310	u64 table64;
	311	guid = ((efi_config_table_64_t *)tablep)->guid;
	312	table64 = ((efi_config_table_64_t *)tablep)->table;
	313	table = table64;
	314	#ifndef CONFIG_64BIT
	315	if (table64 >> 32) {
	316	pr_cont("\n");
	317	pr_err("Table located above 4GB, disabling EFI.\n");
abc93f8e	318	early_memunmap(config_tables,
272686bf LL	319	efi.systab->nr_tables * sz);
	320	return -EINVAL;
	321	}
	322	#endif
	323	} else {
	324	guid = ((efi_config_table_32_t *)tablep)->guid;
	325	table = ((efi_config_table_32_t *)tablep)->table;
	326	}
	327
	328	if (!match_config_table(&guid, table, common_tables))
	329	match_config_table(&guid, table, arch_tables);
	330
	331	tablep += sz;
	332	}
	333	pr_cont("\n");
abc93f8e	334	early_memunmap(config_tables, efi.systab->nr_tables * sz);
0f8093a9 MF	335
	336	set_bit(EFI_CONFIG_TABLES, &efi.flags);
	337
272686bf LL	338	return 0;
272686bf LL	339	}
0302f71c	340
28d54022 LCY	341	#ifdef CONFIG_EFI_VARS_MODULE
	342	static int __init efi_load_efivars(void)
	343	{
	344	struct platform_device *pdev;
	345
	346	if (!efi_enabled(EFI_RUNTIME_SERVICES))
	347	return 0;
	348
	349	pdev = platform_device_register_simple("efivars", 0, NULL, 0);
	350	return IS_ERR(pdev) ? PTR_ERR(pdev) : 0;
	351	}
	352	device_initcall(efi_load_efivars);
	353	#endif
	354
0302f71c MS	355	#ifdef CONFIG_EFI_PARAMS_FROM_FDT
	356
	357	#define UEFI_PARAM(name, prop, field) \
	358	{ \
	359	{ name }, \
	360	{ prop }, \
	361	offsetof(struct efi_fdt_params, field), \
	362	FIELD_SIZEOF(struct efi_fdt_params, field) \
	363	}
	364
	365	static __initdata struct {
	366	const char name[32];
	367	const char propname[32];
	368	int offset;
	369	int size;
	370	} dt_params[] = {
	371	UEFI_PARAM("System Table", "linux,uefi-system-table", system_table),
	372	UEFI_PARAM("MemMap Address", "linux,uefi-mmap-start", mmap),
	373	UEFI_PARAM("MemMap Size", "linux,uefi-mmap-size", mmap_size),
	374	UEFI_PARAM("MemMap Desc. Size", "linux,uefi-mmap-desc-size", desc_size),
	375	UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver)
	376	};
	377
	378	struct param_info {
	379	int verbose;
29e2435f	380	int found;
0302f71c MS	381	void *params;
	382	};
	383
	384	static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
	385	int depth, void *data)
	386	{
	387	struct param_info *info = data;
6fb8cc82 CM	388	const void *prop;
6fb8cc82 CM	389	void *dest;
0302f71c	390	u64 val;
6fb8cc82	391	int i, len;
0302f71c MS	392
	393	if (depth != 1 \|\|
	394	(strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
	395	return 0;
	396
0302f71c MS	397	for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
0302f71c MS	398	prop = of_get_flat_dt_prop(node, dt_params[i].propname, &len);
29e2435f	399	if (!prop)
0302f71c	400	return 0;
0302f71c	401	dest = info->params + dt_params[i].offset;
29e2435f	402	info->found++;
0302f71c MS	403
	404	val = of_read_number(prop, len / sizeof(u32));
	405
	406	if (dt_params[i].size == sizeof(u32))
	407	(u32 )dest = val;
	408	else
	409	(u64 )dest = val;
	410
	411	if (info->verbose)
	412	pr_info(" %s: 0x%0*llx\n", dt_params[i].name,
	413	dt_params[i].size * 2, val);
	414	}
	415	return 1;
	416	}
	417
	418	int __init efi_get_fdt_params(struct efi_fdt_params *params, int verbose)
	419	{
	420	struct param_info info;
29e2435f CM	421	int ret;
	422
	423	pr_info("Getting EFI parameters from FDT:\n");
0302f71c MS	424
0302f71c MS	425	info.verbose = verbose;
29e2435f	426	info.found = 0;
0302f71c MS	427	info.params = params;
0302f71c MS	428
29e2435f CM	429	ret = of_scan_flat_dt(fdt_find_uefi_params, &info);
	430	if (!info.found)
	431	pr_info("UEFI not found.\n");
	432	else if (!ret)
	433	pr_err("Can't find '%s' in device tree!\n",
	434	dt_params[info.found].name);
	435
	436	return ret;
0302f71c MS	437	}
0302f71c MS	438	#endif /* CONFIG_EFI_PARAMS_FROM_FDT */