[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/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;
}
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>
272686bf LL	23	#include <linux/io.h>
	24
	25	struct efi __read_mostly efi = {
	26	.mps = EFI_INVALID_TABLE_ADDR,
	27	.acpi = EFI_INVALID_TABLE_ADDR,
	28	.acpi20 = EFI_INVALID_TABLE_ADDR,
	29	.smbios = EFI_INVALID_TABLE_ADDR,
	30	.sal_systab = EFI_INVALID_TABLE_ADDR,
	31	.boot_info = EFI_INVALID_TABLE_ADDR,
	32	.hcdp = EFI_INVALID_TABLE_ADDR,
	33	.uga = EFI_INVALID_TABLE_ADDR,
	34	.uv_systab = EFI_INVALID_TABLE_ADDR,
a0998eb1 DY	35	.fw_vendor = EFI_INVALID_TABLE_ADDR,
	36	.runtime = EFI_INVALID_TABLE_ADDR,
	37	.config_table = EFI_INVALID_TABLE_ADDR,
272686bf LL	38	};
272686bf LL	39	EXPORT_SYMBOL(efi);
a9499fa7 TG	40
	41	static struct kobject *efi_kobj;
	42	static struct kobject *efivars_kobj;
	43
	44	/*
	45	* Let's not leave out systab information that snuck into
	46	* the efivars driver
	47	*/
	48	static ssize_t systab_show(struct kobject *kobj,
	49	struct kobj_attribute attr, char buf)
	50	{
	51	char *str = buf;
	52
	53	if (!kobj \|\| !buf)
	54	return -EINVAL;
	55
	56	if (efi.mps != EFI_INVALID_TABLE_ADDR)
	57	str += sprintf(str, "MPS=0x%lx\n", efi.mps);
	58	if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
	59	str += sprintf(str, "ACPI20=0x%lx\n", efi.acpi20);
	60	if (efi.acpi != EFI_INVALID_TABLE_ADDR)
	61	str += sprintf(str, "ACPI=0x%lx\n", efi.acpi);
	62	if (efi.smbios != EFI_INVALID_TABLE_ADDR)
	63	str += sprintf(str, "SMBIOS=0x%lx\n", efi.smbios);
	64	if (efi.hcdp != EFI_INVALID_TABLE_ADDR)
	65	str += sprintf(str, "HCDP=0x%lx\n", efi.hcdp);
	66	if (efi.boot_info != EFI_INVALID_TABLE_ADDR)
	67	str += sprintf(str, "BOOTINFO=0x%lx\n", efi.boot_info);
	68	if (efi.uga != EFI_INVALID_TABLE_ADDR)
	69	str += sprintf(str, "UGA=0x%lx\n", efi.uga);
	70
	71	return str - buf;
	72	}
	73
	74	static struct kobj_attribute efi_attr_systab =
	75	__ATTR(systab, 0400, systab_show, NULL);
	76
a0998eb1 DY	77	#define EFI_FIELD(var) efi.var
	78
	79	#define EFI_ATTR_SHOW(name) \
	80	static ssize_t name##_show(struct kobject *kobj, \
	81	struct kobj_attribute attr, char buf) \
	82	{ \
	83	return sprintf(buf, "0x%lx\n", EFI_FIELD(name)); \
	84	}
	85
	86	EFI_ATTR_SHOW(fw_vendor);
	87	EFI_ATTR_SHOW(runtime);
	88	EFI_ATTR_SHOW(config_table);
	89
	90	static struct kobj_attribute efi_attr_fw_vendor = __ATTR_RO(fw_vendor);
	91	static struct kobj_attribute efi_attr_runtime = __ATTR_RO(runtime);
	92	static struct kobj_attribute efi_attr_config_table = __ATTR_RO(config_table);
	93
a9499fa7 TG	94	static struct attribute *efi_subsys_attrs[] = {
a9499fa7 TG	95	&efi_attr_systab.attr,
a0998eb1 DY	96	&efi_attr_fw_vendor.attr,
	97	&efi_attr_runtime.attr,
	98	&efi_attr_config_table.attr,
	99	NULL,
a9499fa7 TG	100	};
a9499fa7 TG	101
a0998eb1 DY	102	static umode_t efi_attr_is_visible(struct kobject *kobj,
	103	struct attribute *attr, int n)
	104	{
	105	umode_t mode = attr->mode;
	106
	107	if (attr == &efi_attr_fw_vendor.attr)
	108	return (efi.fw_vendor == EFI_INVALID_TABLE_ADDR) ? 0 : mode;
	109	else if (attr == &efi_attr_runtime.attr)
	110	return (efi.runtime == EFI_INVALID_TABLE_ADDR) ? 0 : mode;
	111	else if (attr == &efi_attr_config_table.attr)
	112	return (efi.config_table == EFI_INVALID_TABLE_ADDR) ? 0 : mode;
	113
	114	return mode;
	115	}
	116
a9499fa7 TG	117	static struct attribute_group efi_subsys_attr_group = {
a9499fa7 TG	118	.attrs = efi_subsys_attrs,
a0998eb1	119	.is_visible = efi_attr_is_visible,
a9499fa7 TG	120	};
	121
	122	static struct efivars generic_efivars;
	123	static struct efivar_operations generic_ops;
	124
	125	static int generic_ops_register(void)
	126	{
	127	generic_ops.get_variable = efi.get_variable;
	128	generic_ops.set_variable = efi.set_variable;
	129	generic_ops.get_next_variable = efi.get_next_variable;
a614e192	130	generic_ops.query_variable_store = efi_query_variable_store;
a9499fa7 TG	131
	132	return efivars_register(&generic_efivars, &generic_ops, efi_kobj);
	133	}
	134
	135	static void generic_ops_unregister(void)
	136	{
	137	efivars_unregister(&generic_efivars);
	138	}
	139
	140	/*
	141	* We register the efi subsystem with the firmware subsystem and the
	142	* efivars subsystem with the efi subsystem, if the system was booted with
	143	* EFI.
	144	*/
	145	static int __init efisubsys_init(void)
	146	{
	147	int error;
	148
	149	if (!efi_enabled(EFI_BOOT))
	150	return 0;
	151
	152	/* We register the efi directory at /sys/firmware/efi */
	153	efi_kobj = kobject_create_and_add("efi", firmware_kobj);
	154	if (!efi_kobj) {
	155	pr_err("efi: Firmware registration failed.\n");
	156	return -ENOMEM;
	157	}
	158
	159	error = generic_ops_register();
	160	if (error)
	161	goto err_put;
	162
	163	error = sysfs_create_group(efi_kobj, &efi_subsys_attr_group);
	164	if (error) {
	165	pr_err("efi: Sysfs attribute export failed with error %d.\n",
	166	error);
	167	goto err_unregister;
	168	}
	169
926172d4 DY	170	error = efi_runtime_map_init(efi_kobj);
	171	if (error)
	172	goto err_remove_group;
	173
a9499fa7 TG	174	/* and the standard mountpoint for efivarfs */
	175	efivars_kobj = kobject_create_and_add("efivars", efi_kobj);
	176	if (!efivars_kobj) {
	177	pr_err("efivars: Subsystem registration failed.\n");
	178	error = -ENOMEM;
	179	goto err_remove_group;
	180	}
	181
	182	return 0;
	183
	184	err_remove_group:
	185	sysfs_remove_group(efi_kobj, &efi_subsys_attr_group);
	186	err_unregister:
	187	generic_ops_unregister();
	188	err_put:
	189	kobject_put(efi_kobj);
	190	return error;
	191	}
	192
	193	subsys_initcall(efisubsys_init);
272686bf LL	194
272686bf LL	195
258f6fd7 LL	196	/*
	197	* We can't ioremap data in EFI boot services RAM, because we've already mapped
	198	* it as RAM. So, look it up in the existing EFI memory map instead. Only
	199	* callable after efi_enter_virtual_mode and before efi_free_boot_services.
	200	*/
	201	void __iomem *efi_lookup_mapped_addr(u64 phys_addr)
	202	{
	203	struct efi_memory_map *map;
	204	void *p;
	205	map = efi.memmap;
	206	if (!map)
	207	return NULL;
	208	if (WARN_ON(!map->map))
	209	return NULL;
	210	for (p = map->map; p < map->map_end; p += map->desc_size) {
	211	efi_memory_desc_t *md = p;
	212	u64 size = md->num_pages << EFI_PAGE_SHIFT;
	213	u64 end = md->phys_addr + size;
	214	if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
	215	md->type != EFI_BOOT_SERVICES_CODE &&
	216	md->type != EFI_BOOT_SERVICES_DATA)
	217	continue;
	218	if (!md->virt_addr)
	219	continue;
	220	if (phys_addr >= md->phys_addr && phys_addr < end) {
	221	phys_addr += md->virt_addr - md->phys_addr;
	222	return (__force void __iomem *)(unsigned long)phys_addr;
	223	}
	224	}
	225	return NULL;
	226	}
	227
272686bf LL	228	static __initdata efi_config_table_type_t common_tables[] = {
	229	{ACPI_20_TABLE_GUID, "ACPI 2.0", &efi.acpi20},
	230	{ACPI_TABLE_GUID, "ACPI", &efi.acpi},
	231	{HCDP_TABLE_GUID, "HCDP", &efi.hcdp},
	232	{MPS_TABLE_GUID, "MPS", &efi.mps},
	233	{SAL_SYSTEM_TABLE_GUID, "SALsystab", &efi.sal_systab},
	234	{SMBIOS_TABLE_GUID, "SMBIOS", &efi.smbios},
	235	{UGA_IO_PROTOCOL_GUID, "UGA", &efi.uga},
69e60841	236	{NULL_GUID, NULL, NULL},
272686bf LL	237	};
	238
	239	static __init int match_config_table(efi_guid_t *guid,
	240	unsigned long table,
	241	efi_config_table_type_t *table_types)
	242	{
	243	u8 str[EFI_VARIABLE_GUID_LEN + 1];
	244	int i;
	245
	246	if (table_types) {
	247	efi_guid_unparse(guid, str);
	248
	249	for (i = 0; efi_guidcmp(table_types[i].guid, NULL_GUID); i++) {
	250	efi_guid_unparse(&table_types[i].guid, str);
	251
	252	if (!efi_guidcmp(*guid, table_types[i].guid)) {
	253	*(table_types[i].ptr) = table;
	254	pr_cont(" %s=0x%lx ",
	255	table_types[i].name, table);
	256	return 1;
	257	}
	258	}
	259	}
	260
	261	return 0;
	262	}
	263
	264	int __init efi_config_init(efi_config_table_type_t *arch_tables)
	265	{
	266	void config_tables, tablep;
	267	int i, sz;
	268
	269	if (efi_enabled(EFI_64BIT))
	270	sz = sizeof(efi_config_table_64_t);
	271	else
	272	sz = sizeof(efi_config_table_32_t);
	273
	274	/*
	275	* Let's see what config tables the firmware passed to us.
	276	*/
	277	config_tables = early_memremap(efi.systab->tables,
	278	efi.systab->nr_tables * sz);
	279	if (config_tables == NULL) {
	280	pr_err("Could not map Configuration table!\n");
	281	return -ENOMEM;
	282	}
	283
	284	tablep = config_tables;
	285	pr_info("");
	286	for (i = 0; i < efi.systab->nr_tables; i++) {
	287	efi_guid_t guid;
	288	unsigned long table;
	289
	290	if (efi_enabled(EFI_64BIT)) {
	291	u64 table64;
	292	guid = ((efi_config_table_64_t *)tablep)->guid;
	293	table64 = ((efi_config_table_64_t *)tablep)->table;
	294	table = table64;
	295	#ifndef CONFIG_64BIT
	296	if (table64 >> 32) {
	297	pr_cont("\n");
	298	pr_err("Table located above 4GB, disabling EFI.\n");
	299	early_iounmap(config_tables,
	300	efi.systab->nr_tables * sz);
301	return -EINVAL;
302	}
303	#endif
304	} else {
305	guid = ((efi_config_table_32_t *)tablep)->guid;
306	table = ((efi_config_table_32_t *)tablep)->table;
307	}
308
309	if (!match_config_table(&guid, table, common_tables))
310	match_config_table(&guid, table, arch_tables);
311
312	tablep += sz;
313	}
314	pr_cont("\n");
315	early_iounmap(config_tables, efi.systab->nr_tables * sz);
0f8093a9 MF	316
	317	set_bit(EFI_CONFIG_TABLES, &efi.flags);
	318
272686bf LL	319	return 0;
272686bf LL	320	}