[deliverable/linux.git] / arch / x86 / kernel / efi.c

/*
 * Common EFI (Extensible Firmware Interface) support functions
 * Based on Extensible Firmware Interface Specification version 1.0
 *
 * Copyright (C) 1999 VA Linux Systems
 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
 * Copyright (C) 1999-2002 Hewlett-Packard Co.
 *	David Mosberger-Tang <davidm@hpl.hp.com>
 *	Stephane Eranian <eranian@hpl.hp.com>
 * Copyright (C) 2005-2008 Intel Co.
 *	Fenghua Yu <fenghua.yu@intel.com>
 *	Bibo Mao <bibo.mao@intel.com>
 *	Chandramouli Narayanan <mouli@linux.intel.com>
 *	Huang Ying <ying.huang@intel.com>
 *
 * Copied from efi_32.c to eliminate the duplicated code between EFI
 * 32/64 support code. --ying 2007-10-26
 *
 * All EFI Runtime Services are not implemented yet as EFI only
 * supports physical mode addressing on SoftSDV. This is to be fixed
 * in a future version.  --drummond 1999-07-20
 *
 * Implemented EFI runtime services and virtual mode calls.  --davidm
 *
 * Goutham Rao: <goutham.rao@intel.com>
 *	Skip non-WB memory and ignore empty memory ranges.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/efi.h>
#include <linux/bootmem.h>
#include <linux/spinlock.h>
#include <linux/uaccess.h>
#include <linux/time.h>
#include <linux/io.h>
#include <linux/reboot.h>
#include <linux/bcd.h>

#include <asm/setup.h>
#include <asm/efi.h>
#include <asm/time.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>

#define EFI_DEBUG	1
#define PFX 		"EFI: "

int efi_enabled;
EXPORT_SYMBOL(efi_enabled);

struct efi efi;
EXPORT_SYMBOL(efi);

struct efi_memory_map memmap;

struct efi efi_phys __initdata;
static efi_system_table_t efi_systab __initdata;

static int __init setup_noefi(char *arg)
{
	efi_enabled = 0;
	return 0;
}
early_param("noefi", setup_noefi);

static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
{
	return efi_call_virt2(get_time, tm, tc);
}

static efi_status_t virt_efi_set_time(efi_time_t *tm)
{
	return efi_call_virt1(set_time, tm);
}

static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
					     efi_bool_t *pending,
					     efi_time_t *tm)
{
	return efi_call_virt3(get_wakeup_time,
			      enabled, pending, tm);
}

static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
{
	return efi_call_virt2(set_wakeup_time,
			      enabled, tm);
}

static efi_status_t virt_efi_get_variable(efi_char16_t *name,
					  efi_guid_t *vendor,
					  u32 *attr,
					  unsigned long *data_size,
					  void *data)
{
	return efi_call_virt5(get_variable,
			      name, vendor, attr,
			      data_size, data);
}

static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
					       efi_char16_t *name,
					       efi_guid_t *vendor)
{
	return efi_call_virt3(get_next_variable,
			      name_size, name, vendor);
}

static efi_status_t virt_efi_set_variable(efi_char16_t *name,
					  efi_guid_t *vendor,
					  unsigned long attr,
					  unsigned long data_size,
					  void *data)
{
	return efi_call_virt5(set_variable,
			      name, vendor, attr,
			      data_size, data);
}

static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
{
	return efi_call_virt1(get_next_high_mono_count, count);
}

static void virt_efi_reset_system(int reset_type,
				  efi_status_t status,
				  unsigned long data_size,
				  efi_char16_t *data)
{
	efi_call_virt4(reset_system, reset_type, status,
		       data_size, data);
}

static efi_status_t virt_efi_set_virtual_address_map(
	unsigned long memory_map_size,
	unsigned long descriptor_size,
	u32 descriptor_version,
	efi_memory_desc_t *virtual_map)
{
	return efi_call_virt4(set_virtual_address_map,
			      memory_map_size, descriptor_size,
			      descriptor_version, virtual_map);
}

static efi_status_t __init phys_efi_set_virtual_address_map(
	unsigned long memory_map_size,
	unsigned long descriptor_size,
	u32 descriptor_version,
	efi_memory_desc_t *virtual_map)
{
	efi_status_t status;

	efi_call_phys_prelog();
	status = efi_call_phys4(efi_phys.set_virtual_address_map,
				memory_map_size, descriptor_size,
				descriptor_version, virtual_map);
	efi_call_phys_epilog();
	return status;
}

static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
					     efi_time_cap_t *tc)
{
	efi_status_t status;

	efi_call_phys_prelog();
	status = efi_call_phys2(efi_phys.get_time, tm, tc);
	efi_call_phys_epilog();
	return status;
}

int efi_set_rtc_mmss(unsigned long nowtime)
{
	int real_seconds, real_minutes;
	efi_status_t 	status;
	efi_time_t 	eft;
	efi_time_cap_t 	cap;

	status = efi.get_time(&eft, &cap);
	if (status != EFI_SUCCESS) {
		printk(KERN_ERR "Oops: efitime: can't read time!\n");
		return -1;
	}

	real_seconds = nowtime % 60;
	real_minutes = nowtime / 60;
	if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
		real_minutes += 30;
	real_minutes %= 60;
	eft.minute = real_minutes;
	eft.second = real_seconds;

	status = efi.set_time(&eft);
	if (status != EFI_SUCCESS) {
		printk(KERN_ERR "Oops: efitime: can't write time!\n");
		return -1;
	}
	return 0;
}

unsigned long efi_get_time(void)
{
	efi_status_t status;
	efi_time_t eft;
	efi_time_cap_t cap;

	status = efi.get_time(&eft, &cap);
	if (status != EFI_SUCCESS)
		printk(KERN_ERR "Oops: efitime: can't read time!\n");

	return mktime(eft.year, eft.month, eft.day, eft.hour,
		      eft.minute, eft.second);
}

#if EFI_DEBUG
static void __init print_efi_memmap(void)
{
	efi_memory_desc_t *md;
	void *p;
	int i;

	for (p = memmap.map, i = 0;
	     p < memmap.map_end;
	     p += memmap.desc_size, i++) {
		md = p;
		printk(KERN_INFO PFX "mem%02u: type=%u, attr=0x%llx, "
			"range=[0x%016llx-0x%016llx) (%lluMB)\n",
			i, md->type, md->attribute, md->phys_addr,
			md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
			(md->num_pages >> (20 - EFI_PAGE_SHIFT)));
	}
}
#endif  /*  EFI_DEBUG  */

void __init efi_init(void)
{
	efi_config_table_t *config_tables;
	efi_runtime_services_t *runtime;
	efi_char16_t *c16;
	char vendor[100] = "unknown";
	int i = 0;
	void *tmp;

#ifdef CONFIG_X86_32
	efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
	memmap.phys_map = (void *)boot_params.efi_info.efi_memmap;
#else
	efi_phys.systab = (efi_system_table_t *)
		(boot_params.efi_info.efi_systab |
		 ((__u64)boot_params.efi_info.efi_systab_hi<<32));
	memmap.phys_map = (void *)
		(boot_params.efi_info.efi_memmap |
		 ((__u64)boot_params.efi_info.efi_memmap_hi<<32));
#endif
	memmap.nr_map = boot_params.efi_info.efi_memmap_size /
		boot_params.efi_info.efi_memdesc_size;
	memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
	memmap.desc_size = boot_params.efi_info.efi_memdesc_size;

	efi.systab = early_ioremap((unsigned long)efi_phys.systab,
				   sizeof(efi_system_table_t));
	if (efi.systab == NULL)
		printk(KERN_ERR "Couldn't map the EFI system table!\n");
	memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t));
	early_iounmap(efi.systab, sizeof(efi_system_table_t));
	efi.systab = &efi_systab;

	/*
	 * Verify the EFI Table
	 */
	if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
		printk(KERN_ERR "EFI system table signature incorrect!\n");
	if ((efi.systab->hdr.revision >> 16) == 0)
		printk(KERN_ERR "Warning: EFI system table version "
		       "%d.%02d, expected 1.00 or greater!\n",
		       efi.systab->hdr.revision >> 16,
		       efi.systab->hdr.revision & 0xffff);

	/*
	 * Show what we know for posterity
	 */
	c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
	if (c16) {
		for (i = 0; i < sizeof(vendor) && *c16; ++i)
			vendor[i] = *c16++;
		vendor[i] = '\0';
	} else
		printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
	early_iounmap(tmp, 2);

	printk(KERN_INFO "EFI v%u.%.02u by %s \n",
	       efi.systab->hdr.revision >> 16,
	       efi.systab->hdr.revision & 0xffff, vendor);

	/*
	 * Let's see what config tables the firmware passed to us.
	 */
	config_tables = early_ioremap(
		efi.systab->tables,
		efi.systab->nr_tables * sizeof(efi_config_table_t));
	if (config_tables == NULL)
		printk(KERN_ERR "Could not map EFI Configuration Table!\n");

	printk(KERN_INFO);
	for (i = 0; i < efi.systab->nr_tables; i++) {
		if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) {
			efi.mps = config_tables[i].table;
			printk(" MPS=0x%lx ", config_tables[i].table);
		} else if (!efi_guidcmp(config_tables[i].guid,
					ACPI_20_TABLE_GUID)) {
			efi.acpi20 = config_tables[i].table;
			printk(" ACPI 2.0=0x%lx ", config_tables[i].table);
		} else if (!efi_guidcmp(config_tables[i].guid,
					ACPI_TABLE_GUID)) {
			efi.acpi = config_tables[i].table;
			printk(" ACPI=0x%lx ", config_tables[i].table);
		} else if (!efi_guidcmp(config_tables[i].guid,
					SMBIOS_TABLE_GUID)) {
			efi.smbios = config_tables[i].table;
			printk(" SMBIOS=0x%lx ", config_tables[i].table);
		} else if (!efi_guidcmp(config_tables[i].guid,
					HCDP_TABLE_GUID)) {
			efi.hcdp = config_tables[i].table;
			printk(" HCDP=0x%lx ", config_tables[i].table);
		} else if (!efi_guidcmp(config_tables[i].guid,
					UGA_IO_PROTOCOL_GUID)) {
			efi.uga = config_tables[i].table;
			printk(" UGA=0x%lx ", config_tables[i].table);
		}
	}
	printk("\n");
	early_iounmap(config_tables,
			  efi.systab->nr_tables * sizeof(efi_config_table_t));

	/*
	 * Check out the runtime services table. We need to map
	 * the runtime services table so that we can grab the physical
	 * address of several of the EFI runtime functions, needed to
	 * set the firmware into virtual mode.
	 */
	runtime = early_ioremap((unsigned long)efi.systab->runtime,
				sizeof(efi_runtime_services_t));
	if (runtime != NULL) {
		/*
		 * We will only need *early* access to the following
		 * two EFI runtime services before set_virtual_address_map
		 * is invoked.
		 */
		efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
		efi_phys.set_virtual_address_map =
			(efi_set_virtual_address_map_t *)
			runtime->set_virtual_address_map;
		/*
		 * Make efi_get_time can be called before entering
		 * virtual mode.
		 */
		efi.get_time = phys_efi_get_time;
	} else
		printk(KERN_ERR "Could not map the EFI runtime service "
		       "table!\n");
	early_iounmap(runtime, sizeof(efi_runtime_services_t));

	/* Map the EFI memory map */
	memmap.map = early_ioremap((unsigned long)memmap.phys_map,
				   memmap.nr_map * memmap.desc_size);
	if (memmap.map == NULL)
		printk(KERN_ERR "Could not map the EFI memory map!\n");
	memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
	if (memmap.desc_size != sizeof(efi_memory_desc_t))
		printk(KERN_WARNING "Kernel-defined memdesc"
		       "doesn't match the one from EFI!\n");

	/* Setup for EFI runtime service */
	reboot_type = BOOT_EFI;

#if EFI_DEBUG
	print_efi_memmap();
#endif
}

static void __init runtime_code_page_mkexec(void)
{
	efi_memory_desc_t *md;
	void *p;

	/* Make EFI runtime service code area executable */
	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
		md = p;

		if (md->type != EFI_RUNTIME_SERVICES_CODE)
			continue;

		set_memory_x(md->virt_addr, md->num_pages);
	}
}

/*
 * This function will switch the EFI runtime services to virtual mode.
 * Essentially, look through the EFI memmap and map every region that
 * has the runtime attribute bit set in its memory descriptor and update
 * that memory descriptor with the virtual address obtained from ioremap().
 * This enables the runtime services to be called without having to
 * thunk back into physical mode for every invocation.
 */
void __init efi_enter_virtual_mode(void)
{
	efi_memory_desc_t *md;
	efi_status_t status;
	unsigned long size;
	u64 end, systab;
	void *p, *va;

	efi.systab = NULL;
	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
		md = p;
		if (!(md->attribute & EFI_MEMORY_RUNTIME))
			continue;

		size = md->num_pages << EFI_PAGE_SHIFT;
		end = md->phys_addr + size;

		if ((end >> PAGE_SHIFT) <= max_pfn_mapped)
			va = __va(md->phys_addr);
		else
			va = efi_ioremap(md->phys_addr, size);

		md->virt_addr = (u64) (unsigned long) va;

		if (!va) {
			printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n",
			       (unsigned long long)md->phys_addr);
			continue;
		}

		if (!(md->attribute & EFI_MEMORY_WB))
			set_memory_uc(md->virt_addr, md->num_pages);

		systab = (u64) (unsigned long) efi_phys.systab;
		if (md->phys_addr <= systab && systab < end) {
			systab += md->virt_addr - md->phys_addr;
			efi.systab = (efi_system_table_t *) (unsigned long) systab;
		}
	}

	BUG_ON(!efi.systab);

	status = phys_efi_set_virtual_address_map(
		memmap.desc_size * memmap.nr_map,
		memmap.desc_size,
		memmap.desc_version,
		memmap.phys_map);

	if (status != EFI_SUCCESS) {
		printk(KERN_ALERT "Unable to switch EFI into virtual mode "
		       "(status=%lx)!\n", status);
		panic("EFI call to SetVirtualAddressMap() failed!");
	}

	/*
	 * Now that EFI is in virtual mode, update the function
	 * pointers in the runtime service table to the new virtual addresses.
	 *
	 * Call EFI services through wrapper functions.
	 */
	efi.get_time = virt_efi_get_time;
	efi.set_time = virt_efi_set_time;
	efi.get_wakeup_time = virt_efi_get_wakeup_time;
	efi.set_wakeup_time = virt_efi_set_wakeup_time;
	efi.get_variable = virt_efi_get_variable;
	efi.get_next_variable = virt_efi_get_next_variable;
	efi.set_variable = virt_efi_set_variable;
	efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
	efi.reset_system = virt_efi_reset_system;
	efi.set_virtual_address_map = virt_efi_set_virtual_address_map;
	if (__supported_pte_mask & _PAGE_NX)
		runtime_code_page_mkexec();
	early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
	memmap.map = NULL;
}

/*
 * Convenience functions to obtain memory types and attributes
 */
u32 efi_mem_type(unsigned long phys_addr)
{
	efi_memory_desc_t *md;
	void *p;

	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
		md = p;
		if ((md->phys_addr <= phys_addr) &&
		    (phys_addr < (md->phys_addr +
				  (md->num_pages << EFI_PAGE_SHIFT))))
			return md->type;
	}
	return 0;
}

u64 efi_mem_attributes(unsigned long phys_addr)
{
	efi_memory_desc_t *md;
	void *p;

	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
		md = p;
		if ((md->phys_addr <= phys_addr) &&
		    (phys_addr < (md->phys_addr +
				  (md->num_pages << EFI_PAGE_SHIFT))))
			return md->attribute;
	}
	return 0;
}
Commit	Line	Data
5b83683f HY	1	/*
	2	* Common EFI (Extensible Firmware Interface) support functions
	3	* Based on Extensible Firmware Interface Specification version 1.0
	4	*
	5	* Copyright (C) 1999 VA Linux Systems
	6	* Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
	7	* Copyright (C) 1999-2002 Hewlett-Packard Co.
	8	* David Mosberger-Tang <davidm@hpl.hp.com>
	9	* Stephane Eranian <eranian@hpl.hp.com>
	10	* Copyright (C) 2005-2008 Intel Co.
	11	* Fenghua Yu <fenghua.yu@intel.com>
	12	* Bibo Mao <bibo.mao@intel.com>
	13	* Chandramouli Narayanan <mouli@linux.intel.com>
	14	* Huang Ying <ying.huang@intel.com>
	15	*
	16	* Copied from efi_32.c to eliminate the duplicated code between EFI
	17	* 32/64 support code. --ying 2007-10-26
	18	*
	19	* All EFI Runtime Services are not implemented yet as EFI only
	20	* supports physical mode addressing on SoftSDV. This is to be fixed
	21	* in a future version. --drummond 1999-07-20
	22	*
	23	* Implemented EFI runtime services and virtual mode calls. --davidm
	24	*
	25	* Goutham Rao: <goutham.rao@intel.com>
	26	* Skip non-WB memory and ignore empty memory ranges.
	27	*/
	28
	29	#include <linux/kernel.h>
	30	#include <linux/init.h>
	31	#include <linux/efi.h>
	32	#include <linux/bootmem.h>
	33	#include <linux/spinlock.h>
	34	#include <linux/uaccess.h>
	35	#include <linux/time.h>
	36	#include <linux/io.h>
	37	#include <linux/reboot.h>
	38	#include <linux/bcd.h>
	39
	40	#include <asm/setup.h>
	41	#include <asm/efi.h>
	42	#include <asm/time.h>
a2172e25 HY	43	#include <asm/cacheflush.h>
a2172e25 HY	44	#include <asm/tlbflush.h>
5b83683f HY	45
	46	#define EFI_DEBUG 1
	47	#define PFX "EFI: "
	48
	49	int efi_enabled;
	50	EXPORT_SYMBOL(efi_enabled);
	51
	52	struct efi efi;
	53	EXPORT_SYMBOL(efi);
	54
	55	struct efi_memory_map memmap;
	56
	57	struct efi efi_phys __initdata;
	58	static efi_system_table_t efi_systab __initdata;
	59
8b2cb7a8 HY	60	static int __init setup_noefi(char *arg)
	61	{
	62	efi_enabled = 0;
	63	return 0;
	64	}
	65	early_param("noefi", setup_noefi);
	66
5b83683f HY	67	static efi_status_t virt_efi_get_time(efi_time_t tm, efi_time_cap_t tc)
	68	{
	69	return efi_call_virt2(get_time, tm, tc);
	70	}
	71
	72	static efi_status_t virt_efi_set_time(efi_time_t *tm)
	73	{
	74	return efi_call_virt1(set_time, tm);
	75	}
	76
	77	static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
	78	efi_bool_t *pending,
	79	efi_time_t *tm)
	80	{
	81	return efi_call_virt3(get_wakeup_time,
	82	enabled, pending, tm);
	83	}
	84
	85	static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
	86	{
	87	return efi_call_virt2(set_wakeup_time,
	88	enabled, tm);
	89	}
	90
	91	static efi_status_t virt_efi_get_variable(efi_char16_t *name,
	92	efi_guid_t *vendor,
	93	u32 *attr,
	94	unsigned long *data_size,
	95	void *data)
	96	{
	97	return efi_call_virt5(get_variable,
	98	name, vendor, attr,
	99	data_size, data);
	100	}
	101
	102	static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
	103	efi_char16_t *name,
	104	efi_guid_t *vendor)
	105	{
	106	return efi_call_virt3(get_next_variable,
	107	name_size, name, vendor);
	108	}
	109
	110	static efi_status_t virt_efi_set_variable(efi_char16_t *name,
	111	efi_guid_t *vendor,
	112	unsigned long attr,
	113	unsigned long data_size,
	114	void *data)
	115	{
	116	return efi_call_virt5(set_variable,
	117	name, vendor, attr,
	118	data_size, data);
	119	}
	120
	121	static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
	122	{
	123	return efi_call_virt1(get_next_high_mono_count, count);
	124	}
	125
	126	static void virt_efi_reset_system(int reset_type,
	127	efi_status_t status,
	128	unsigned long data_size,
	129	efi_char16_t *data)
	130	{
131	efi_call_virt4(reset_system, reset_type, status,
132	data_size, data);
133	}
134
135	static efi_status_t virt_efi_set_virtual_address_map(
136	unsigned long memory_map_size,
137	unsigned long descriptor_size,
138	u32 descriptor_version,
139	efi_memory_desc_t *virtual_map)
140	{
141	return efi_call_virt4(set_virtual_address_map,
142	memory_map_size, descriptor_size,
143	descriptor_version, virtual_map);
144	}
145
146	static efi_status_t __init phys_efi_set_virtual_address_map(
147	unsigned long memory_map_size,
148	unsigned long descriptor_size,
149	u32 descriptor_version,
150	efi_memory_desc_t *virtual_map)
151	{
152	efi_status_t status;
153
154	efi_call_phys_prelog();
155	status = efi_call_phys4(efi_phys.set_virtual_address_map,
156	memory_map_size, descriptor_size,
157	descriptor_version, virtual_map);
158	efi_call_phys_epilog();
159	return status;
160	}
161
162	static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
163	efi_time_cap_t *tc)
164	{
165	efi_status_t status;
166
167	efi_call_phys_prelog();
168	status = efi_call_phys2(efi_phys.get_time, tm, tc);
169	efi_call_phys_epilog();
170	return status;
171	}
172
173	int efi_set_rtc_mmss(unsigned long nowtime)
174	{
175	int real_seconds, real_minutes;
176	efi_status_t status;
177	efi_time_t eft;
178	efi_time_cap_t cap;
179
180	status = efi.get_time(&eft, &cap);
181	if (status != EFI_SUCCESS) {
182	printk(KERN_ERR "Oops: efitime: can't read time!\n");
183	return -1;
184	}
185
186	real_seconds = nowtime % 60;
187	real_minutes = nowtime / 60;
188	if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
189	real_minutes += 30;
190	real_minutes %= 60;
191	eft.minute = real_minutes;
192	eft.second = real_seconds;
193
194	status = efi.set_time(&eft);
195	if (status != EFI_SUCCESS) {
196	printk(KERN_ERR "Oops: efitime: can't write time!\n");
197	return -1;
198	}
199	return 0;
200	}
201
202	unsigned long efi_get_time(void)
203	{
204	efi_status_t status;
205	efi_time_t eft;
206	efi_time_cap_t cap;
207
208	status = efi.get_time(&eft, &cap);
209	if (status != EFI_SUCCESS)
210	printk(KERN_ERR "Oops: efitime: can't read time!\n");
211
212	return mktime(eft.year, eft.month, eft.day, eft.hour,
213	eft.minute, eft.second);
214	}
215
216	#if EFI_DEBUG
217	static void __init print_efi_memmap(void)
218	{
219	efi_memory_desc_t *md;
220	void *p;
221	int i;
222
223	for (p = memmap.map, i = 0;
224	p < memmap.map_end;
225	p += memmap.desc_size, i++) {
226	md = p;
227	printk(KERN_INFO PFX "mem%02u: type=%u, attr=0x%llx, "
228	"range=[0x%016llx-0x%016llx) (%lluMB)\n",
229	i, md->type, md->attribute, md->phys_addr,
230	md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
231	(md->num_pages >> (20 - EFI_PAGE_SHIFT)));
232	}
233	}
234	#endif /* EFI_DEBUG */
235
236	void __init efi_init(void)
237	{
238	efi_config_table_t *config_tables;
239	efi_runtime_services_t *runtime;
240	efi_char16_t *c16;
241	char vendor[100] = "unknown";
242	int i = 0;
243	void *tmp;
244
245	#ifdef CONFIG_X86_32
246	efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
247	memmap.phys_map = (void *)boot_params.efi_info.efi_memmap;
248	#else
249	efi_phys.systab = (efi_system_table_t *)
250	(boot_params.efi_info.efi_systab \|
251	((__u64)boot_params.efi_info.efi_systab_hi<<32));
252	memmap.phys_map = (void *)
253	(boot_params.efi_info.efi_memmap \|
254	((__u64)boot_params.efi_info.efi_memmap_hi<<32));
255	#endif
256	memmap.nr_map = boot_params.efi_info.efi_memmap_size /
257	boot_params.efi_info.efi_memdesc_size;
258	memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
259	memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
260
beacfaac HY	261	efi.systab = early_ioremap((unsigned long)efi_phys.systab,
beacfaac HY	262	sizeof(efi_system_table_t));
5b83683f HY	263	if (efi.systab == NULL)
	264	printk(KERN_ERR "Couldn't map the EFI system table!\n");
	265	memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t));
beacfaac	266	early_iounmap(efi.systab, sizeof(efi_system_table_t));
5b83683f HY	267	efi.systab = &efi_systab;
	268
	269	/*
	270	* Verify the EFI Table
	271	*/
	272	if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
	273	printk(KERN_ERR "EFI system table signature incorrect!\n");
	274	if ((efi.systab->hdr.revision >> 16) == 0)
	275	printk(KERN_ERR "Warning: EFI system table version "
	276	"%d.%02d, expected 1.00 or greater!\n",
	277	efi.systab->hdr.revision >> 16,
	278	efi.systab->hdr.revision & 0xffff);
	279
	280	/*
	281	* Show what we know for posterity
	282	*/
beacfaac	283	c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
5b83683f HY	284	if (c16) {
	285	for (i = 0; i < sizeof(vendor) && *c16; ++i)
	286	vendor[i] = *c16++;
	287	vendor[i] = '\0';
	288	} else
	289	printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
beacfaac	290	early_iounmap(tmp, 2);
5b83683f HY	291
	292	printk(KERN_INFO "EFI v%u.%.02u by %s \n",
	293	efi.systab->hdr.revision >> 16,
	294	efi.systab->hdr.revision & 0xffff, vendor);
	295
	296	/*
	297	* Let's see what config tables the firmware passed to us.
	298	*/
beacfaac	299	config_tables = early_ioremap(
5b83683f HY	300	efi.systab->tables,
	301	efi.systab->nr_tables * sizeof(efi_config_table_t));
	302	if (config_tables == NULL)
	303	printk(KERN_ERR "Could not map EFI Configuration Table!\n");
	304
	305	printk(KERN_INFO);
	306	for (i = 0; i < efi.systab->nr_tables; i++) {
	307	if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) {
	308	efi.mps = config_tables[i].table;
	309	printk(" MPS=0x%lx ", config_tables[i].table);
	310	} else if (!efi_guidcmp(config_tables[i].guid,
	311	ACPI_20_TABLE_GUID)) {
	312	efi.acpi20 = config_tables[i].table;
	313	printk(" ACPI 2.0=0x%lx ", config_tables[i].table);
	314	} else if (!efi_guidcmp(config_tables[i].guid,
	315	ACPI_TABLE_GUID)) {
	316	efi.acpi = config_tables[i].table;
	317	printk(" ACPI=0x%lx ", config_tables[i].table);
	318	} else if (!efi_guidcmp(config_tables[i].guid,
	319	SMBIOS_TABLE_GUID)) {
	320	efi.smbios = config_tables[i].table;
	321	printk(" SMBIOS=0x%lx ", config_tables[i].table);
	322	} else if (!efi_guidcmp(config_tables[i].guid,
	323	HCDP_TABLE_GUID)) {
	324	efi.hcdp = config_tables[i].table;
	325	printk(" HCDP=0x%lx ", config_tables[i].table);
	326	} else if (!efi_guidcmp(config_tables[i].guid,
	327	UGA_IO_PROTOCOL_GUID)) {
	328	efi.uga = config_tables[i].table;
	329	printk(" UGA=0x%lx ", config_tables[i].table);
	330	}
	331	}
	332	printk("\n");
beacfaac	333	early_iounmap(config_tables,
5b83683f HY	334	efi.systab->nr_tables * sizeof(efi_config_table_t));
	335
	336	/*
	337	* Check out the runtime services table. We need to map
	338	* the runtime services table so that we can grab the physical
	339	* address of several of the EFI runtime functions, needed to
	340	* set the firmware into virtual mode.
	341	*/
beacfaac HY	342	runtime = early_ioremap((unsigned long)efi.systab->runtime,
beacfaac HY	343	sizeof(efi_runtime_services_t));
5b83683f HY	344	if (runtime != NULL) {
	345	/*
	346	* We will only need early access to the following
	347	* two EFI runtime services before set_virtual_address_map
	348	* is invoked.
	349	*/
	350	efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
	351	efi_phys.set_virtual_address_map =
	352	(efi_set_virtual_address_map_t *)
	353	runtime->set_virtual_address_map;
	354	/*
	355	* Make efi_get_time can be called before entering
	356	* virtual mode.
	357	*/
	358	efi.get_time = phys_efi_get_time;
	359	} else
	360	printk(KERN_ERR "Could not map the EFI runtime service "
	361	"table!\n");
beacfaac	362	early_iounmap(runtime, sizeof(efi_runtime_services_t));
5b83683f HY	363
5b83683f HY	364	/* Map the EFI memory map */
beacfaac HY	365	memmap.map = early_ioremap((unsigned long)memmap.phys_map,
beacfaac HY	366	memmap.nr_map * memmap.desc_size);
5b83683f HY	367	if (memmap.map == NULL)
	368	printk(KERN_ERR "Could not map the EFI memory map!\n");
	369	memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
	370	if (memmap.desc_size != sizeof(efi_memory_desc_t))
	371	printk(KERN_WARNING "Kernel-defined memdesc"
	372	"doesn't match the one from EFI!\n");
	373
5b83683f HY	374	/* Setup for EFI runtime service */
	375	reboot_type = BOOT_EFI;
	376
5b83683f HY	377	#if EFI_DEBUG
	378	print_efi_memmap();
	379	#endif
	380	}
	381
a2172e25 HY	382	static void __init runtime_code_page_mkexec(void)
	383	{
	384	efi_memory_desc_t *md;
a2172e25 HY	385	void *p;
a2172e25 HY	386
a2172e25 HY	387	/* Make EFI runtime service code area executable */
	388	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
	389	md = p;
1c083eb2 HY	390
	391	if (md->type != EFI_RUNTIME_SERVICES_CODE)
	392	continue;
	393
3223f59f	394	set_memory_x(md->virt_addr, md->num_pages);
a2172e25	395	}
a2172e25	396	}
a2172e25	397
5b83683f HY	398	/*
	399	* This function will switch the EFI runtime services to virtual mode.
	400	* Essentially, look through the EFI memmap and map every region that
	401	* has the runtime attribute bit set in its memory descriptor and update
	402	* that memory descriptor with the virtual address obtained from ioremap().
	403	* This enables the runtime services to be called without having to
	404	* thunk back into physical mode for every invocation.
	405	*/
	406	void __init efi_enter_virtual_mode(void)
	407	{
	408	efi_memory_desc_t *md;
	409	efi_status_t status;
1c083eb2 HY	410	unsigned long size;
	411	u64 end, systab;
	412	void p, va;
5b83683f HY	413
	414	efi.systab = NULL;
	415	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
	416	md = p;
	417	if (!(md->attribute & EFI_MEMORY_RUNTIME))
	418	continue;
1c083eb2 HY	419
	420	size = md->num_pages << EFI_PAGE_SHIFT;
	421	end = md->phys_addr + size;
	422
	423	if ((end >> PAGE_SHIFT) <= max_pfn_mapped)
	424	va = __va(md->phys_addr);
5b83683f	425	else
1c083eb2 HY	426	va = efi_ioremap(md->phys_addr, size);
1c083eb2 HY	427
1c083eb2 HY	428	md->virt_addr = (u64) (unsigned long) va;
	429
	430	if (!va) {
5b83683f HY	431	printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n",
5b83683f HY	432	(unsigned long long)md->phys_addr);
1c083eb2 HY	433	continue;
	434	}
	435
e85f2051	436	if (!(md->attribute & EFI_MEMORY_WB))
3223f59f	437	set_memory_uc(md->virt_addr, md->num_pages);
e85f2051	438
1c083eb2 HY	439	systab = (u64) (unsigned long) efi_phys.systab;
	440	if (md->phys_addr <= systab && systab < end) {
	441	systab += md->virt_addr - md->phys_addr;
	442	efi.systab = (efi_system_table_t *) (unsigned long) systab;
	443	}
5b83683f HY	444	}
	445
	446	BUG_ON(!efi.systab);
	447
	448	status = phys_efi_set_virtual_address_map(
	449	memmap.desc_size * memmap.nr_map,
	450	memmap.desc_size,
	451	memmap.desc_version,
	452	memmap.phys_map);
	453
	454	if (status != EFI_SUCCESS) {
	455	printk(KERN_ALERT "Unable to switch EFI into virtual mode "
	456	"(status=%lx)!\n", status);
	457	panic("EFI call to SetVirtualAddressMap() failed!");
	458	}
	459
	460	/*
	461	* Now that EFI is in virtual mode, update the function
	462	* pointers in the runtime service table to the new virtual addresses.
	463	*
	464	* Call EFI services through wrapper functions.
	465	*/
	466	efi.get_time = virt_efi_get_time;
	467	efi.set_time = virt_efi_set_time;
	468	efi.get_wakeup_time = virt_efi_get_wakeup_time;
	469	efi.set_wakeup_time = virt_efi_set_wakeup_time;
	470	efi.get_variable = virt_efi_get_variable;
	471	efi.get_next_variable = virt_efi_get_next_variable;
	472	efi.set_variable = virt_efi_set_variable;
	473	efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
	474	efi.reset_system = virt_efi_reset_system;
	475	efi.set_virtual_address_map = virt_efi_set_virtual_address_map;
4de0d4a6 HY	476	if (__supported_pte_mask & _PAGE_NX)
4de0d4a6 HY	477	runtime_code_page_mkexec();
a3828064 HY	478	early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
a3828064 HY	479	memmap.map = NULL;
5b83683f HY	480	}
	481
	482	/*
	483	* Convenience functions to obtain memory types and attributes
	484	*/
	485	u32 efi_mem_type(unsigned long phys_addr)
	486	{
	487	efi_memory_desc_t *md;
	488	void *p;
	489
	490	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
	491	md = p;
	492	if ((md->phys_addr <= phys_addr) &&
	493	(phys_addr < (md->phys_addr +
	494	(md->num_pages << EFI_PAGE_SHIFT))))
	495	return md->type;
	496	}
	497	return 0;
	498	}
	499
	500	u64 efi_mem_attributes(unsigned long phys_addr)
	501	{
	502	efi_memory_desc_t *md;
	503	void *p;
	504
	505	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
	506	md = p;
	507	if ((md->phys_addr <= phys_addr) &&
	508	(phys_addr < (md->phys_addr +
	509	(md->num_pages << EFI_PAGE_SHIFT))))
	510	return md->attribute;
	511	}
	512	return 0;
	513	}