[mirror_ubuntu-hirsute-kernel.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;

static 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);

int add_efi_memmap;
EXPORT_SYMBOL(add_efi_memmap);

static int __init setup_add_efi_memmap(char *arg)
{
	add_efi_memmap = 1;
	return 0;
}
early_param("add_efi_memmap", setup_add_efi_memmap);


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);
}

/*
 * Tell the kernel about the EFI memory map.  This might include
 * more than the max 128 entries that can fit in the e820 legacy
 * (zeropage) memory map.
 */

static void __init do_add_efi_memmap(void)
{
	void *p;

	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
		efi_memory_desc_t *md = p;
		unsigned long long start = md->phys_addr;
		unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
		int e820_type;

		if (md->attribute & EFI_MEMORY_WB)
			e820_type = E820_RAM;
		else
			e820_type = E820_RESERVED;
		e820_add_region(start, size, e820_type);
	}
	sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
}

void __init efi_reserve_early(void)
{
	unsigned long pmap;

#ifdef CONFIG_X86_32
	pmap = boot_params.efi_info.efi_memmap;
#else
	pmap = (boot_params.efi_info.efi_memmap |
		((__u64)boot_params.efi_info.efi_memmap_hi<<32));
#endif
	memmap.phys_map = (void *)pmap;
	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;
	reserve_early(pmap, pmap + memmap.nr_map * memmap.desc_size,
		      "EFI memmap");
}

#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;
#else
	efi_phys.systab = (efi_system_table_t *)
		(boot_params.efi_info.efi_systab |
		 ((__u64)boot_params.efi_info.efi_systab_hi<<32));
#endif

	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);
#ifdef CONFIG_X86_UV
		} else if (!efi_guidcmp(config_tables[i].guid,
					UV_SYSTEM_TABLE_GUID)) {
			efi.uv_systab = config_tables[i].table;
			printk(" UVsystab=0x%lx ", config_tables[i].table);
#endif
		} 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");

	if (add_efi_memmap)
		do_add_efi_memmap();

	/* 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;
	u64 addr, npages;

	/* 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;

		addr = md->virt_addr;
		npages = md->num_pages;
		memrange_efi_to_native(&addr, &npages);
		set_memory_x(addr, npages);
	}
}

/*
 * 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, addr, npages, end_pfn;
	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;

		end_pfn = PFN_UP(end);
		if (end_pfn <= max_low_pfn_mapped
		    || (end_pfn > (1UL << (32 - PAGE_SHIFT))
			&& end_pfn <= 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)) {
			addr = md->virt_addr;
			npages = md->num_pages;
			memrange_efi_to_native(&addr, &npages);
			set_memory_uc(addr, npages);
		}

		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
ecaea42e	57	static struct efi efi_phys __initdata;
5b83683f HY	58	static efi_system_table_t efi_systab __initdata;
5b83683f HY	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
200001eb PJ	67	int add_efi_memmap;
	68	EXPORT_SYMBOL(add_efi_memmap);
	69
	70	static int __init setup_add_efi_memmap(char *arg)
	71	{
	72	add_efi_memmap = 1;
	73	return 0;
	74	}
	75	early_param("add_efi_memmap", setup_add_efi_memmap);
	76
	77
5b83683f HY	78	static efi_status_t virt_efi_get_time(efi_time_t tm, efi_time_cap_t tc)
	79	{
	80	return efi_call_virt2(get_time, tm, tc);
	81	}
	82
	83	static efi_status_t virt_efi_set_time(efi_time_t *tm)
	84	{
	85	return efi_call_virt1(set_time, tm);
	86	}
	87
	88	static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
	89	efi_bool_t *pending,
	90	efi_time_t *tm)
	91	{
	92	return efi_call_virt3(get_wakeup_time,
	93	enabled, pending, tm);
	94	}
	95
	96	static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
	97	{
	98	return efi_call_virt2(set_wakeup_time,
	99	enabled, tm);
	100	}
	101
	102	static efi_status_t virt_efi_get_variable(efi_char16_t *name,
	103	efi_guid_t *vendor,
	104	u32 *attr,
	105	unsigned long *data_size,
	106	void *data)
	107	{
	108	return efi_call_virt5(get_variable,
	109	name, vendor, attr,
	110	data_size, data);
	111	}
	112
	113	static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
	114	efi_char16_t *name,
	115	efi_guid_t *vendor)
	116	{
	117	return efi_call_virt3(get_next_variable,
	118	name_size, name, vendor);
	119	}
	120
	121	static efi_status_t virt_efi_set_variable(efi_char16_t *name,
	122	efi_guid_t *vendor,
	123	unsigned long attr,
	124	unsigned long data_size,
	125	void *data)
	126	{
	127	return efi_call_virt5(set_variable,
	128	name, vendor, attr,
	129	data_size, data);
	130	}
	131
	132	static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
	133	{
	134	return efi_call_virt1(get_next_high_mono_count, count);
	135	}
	136
	137	static void virt_efi_reset_system(int reset_type,
	138	efi_status_t status,
	139	unsigned long data_size,
	140	efi_char16_t *data)
	141	{
142	efi_call_virt4(reset_system, reset_type, status,
143	data_size, data);
144	}
145
146	static efi_status_t virt_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	return efi_call_virt4(set_virtual_address_map,
153	memory_map_size, descriptor_size,
154	descriptor_version, virtual_map);
155	}
156
157	static efi_status_t __init phys_efi_set_virtual_address_map(
158	unsigned long memory_map_size,
159	unsigned long descriptor_size,
160	u32 descriptor_version,
161	efi_memory_desc_t *virtual_map)
162	{
163	efi_status_t status;
164
165	efi_call_phys_prelog();
166	status = efi_call_phys4(efi_phys.set_virtual_address_map,
167	memory_map_size, descriptor_size,
168	descriptor_version, virtual_map);
169	efi_call_phys_epilog();
170	return status;
171	}
172
173	static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
174	efi_time_cap_t *tc)
175	{
176	efi_status_t status;
177
178	efi_call_phys_prelog();
179	status = efi_call_phys2(efi_phys.get_time, tm, tc);
180	efi_call_phys_epilog();
181	return status;
182	}
183
184	int efi_set_rtc_mmss(unsigned long nowtime)
185	{
186	int real_seconds, real_minutes;
187	efi_status_t status;
188	efi_time_t eft;
189	efi_time_cap_t cap;
190
191	status = efi.get_time(&eft, &cap);
192	if (status != EFI_SUCCESS) {
193	printk(KERN_ERR "Oops: efitime: can't read time!\n");
194	return -1;
195	}
196
197	real_seconds = nowtime % 60;
198	real_minutes = nowtime / 60;
199	if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
200	real_minutes += 30;
201	real_minutes %= 60;
202	eft.minute = real_minutes;
203	eft.second = real_seconds;
204
205	status = efi.set_time(&eft);
206	if (status != EFI_SUCCESS) {
207	printk(KERN_ERR "Oops: efitime: can't write time!\n");
208	return -1;
209	}
210	return 0;
211	}
212
213	unsigned long efi_get_time(void)
214	{
215	efi_status_t status;
216	efi_time_t eft;
217	efi_time_cap_t cap;
218
219	status = efi.get_time(&eft, &cap);
220	if (status != EFI_SUCCESS)
221	printk(KERN_ERR "Oops: efitime: can't read time!\n");
222
223	return mktime(eft.year, eft.month, eft.day, eft.hour,
224	eft.minute, eft.second);
225	}
226
69c91893 PJ	227	/*
	228	* Tell the kernel about the EFI memory map. This might include
	229	* more than the max 128 entries that can fit in the e820 legacy
	230	* (zeropage) memory map.
	231	*/
	232
200001eb	233	static void __init do_add_efi_memmap(void)
69c91893 PJ	234	{
	235	void *p;
	236
	237	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
	238	efi_memory_desc_t *md = p;
	239	unsigned long long start = md->phys_addr;
	240	unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
	241	int e820_type;
	242
	243	if (md->attribute & EFI_MEMORY_WB)
	244	e820_type = E820_RAM;
	245	else
	246	e820_type = E820_RESERVED;
d0be6bde	247	e820_add_region(start, size, e820_type);
69c91893 PJ	248	}
	249	sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
	250	}
	251
ecacf09f HY	252	void __init efi_reserve_early(void)
	253	{
	254	unsigned long pmap;
	255
05486fa7	256	#ifdef CONFIG_X86_32
ecacf09f	257	pmap = boot_params.efi_info.efi_memmap;
05486fa7 PJ	258	#else
	259	pmap = (boot_params.efi_info.efi_memmap \|
	260	((__u64)boot_params.efi_info.efi_memmap_hi<<32));
ecacf09f HY	261	#endif
	262	memmap.phys_map = (void *)pmap;
	263	memmap.nr_map = boot_params.efi_info.efi_memmap_size /
	264	boot_params.efi_info.efi_memdesc_size;
	265	memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
	266	memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
	267	reserve_early(pmap, pmap + memmap.nr_map * memmap.desc_size,
	268	"EFI memmap");
	269	}
	270
5b83683f HY	271	#if EFI_DEBUG
	272	static void __init print_efi_memmap(void)
	273	{
	274	efi_memory_desc_t *md;
	275	void *p;
	276	int i;
	277
	278	for (p = memmap.map, i = 0;
	279	p < memmap.map_end;
	280	p += memmap.desc_size, i++) {
	281	md = p;
	282	printk(KERN_INFO PFX "mem%02u: type=%u, attr=0x%llx, "
	283	"range=[0x%016llx-0x%016llx) (%lluMB)\n",
	284	i, md->type, md->attribute, md->phys_addr,
	285	md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
	286	(md->num_pages >> (20 - EFI_PAGE_SHIFT)));
	287	}
	288	}
	289	#endif /* EFI_DEBUG */
	290
	291	void __init efi_init(void)
	292	{
	293	efi_config_table_t *config_tables;
	294	efi_runtime_services_t *runtime;
	295	efi_char16_t *c16;
	296	char vendor[100] = "unknown";
	297	int i = 0;
	298	void *tmp;
	299
05486fa7	300	#ifdef CONFIG_X86_32
5b83683f	301	efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
05486fa7 PJ	302	#else
	303	efi_phys.systab = (efi_system_table_t *)
	304	(boot_params.efi_info.efi_systab \|
	305	((__u64)boot_params.efi_info.efi_systab_hi<<32));
5b83683f	306	#endif
5b83683f	307
beacfaac HY	308	efi.systab = early_ioremap((unsigned long)efi_phys.systab,
beacfaac HY	309	sizeof(efi_system_table_t));
5b83683f HY	310	if (efi.systab == NULL)
	311	printk(KERN_ERR "Couldn't map the EFI system table!\n");
	312	memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t));
beacfaac	313	early_iounmap(efi.systab, sizeof(efi_system_table_t));
5b83683f HY	314	efi.systab = &efi_systab;
	315
	316	/*
	317	* Verify the EFI Table
	318	*/
	319	if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
	320	printk(KERN_ERR "EFI system table signature incorrect!\n");
	321	if ((efi.systab->hdr.revision >> 16) == 0)
	322	printk(KERN_ERR "Warning: EFI system table version "
	323	"%d.%02d, expected 1.00 or greater!\n",
	324	efi.systab->hdr.revision >> 16,
	325	efi.systab->hdr.revision & 0xffff);
	326
	327	/*
	328	* Show what we know for posterity
	329	*/
beacfaac	330	c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
5b83683f HY	331	if (c16) {
	332	for (i = 0; i < sizeof(vendor) && *c16; ++i)
	333	vendor[i] = *c16++;
	334	vendor[i] = '\0';
	335	} else
	336	printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
beacfaac	337	early_iounmap(tmp, 2);
5b83683f HY	338
	339	printk(KERN_INFO "EFI v%u.%.02u by %s \n",
	340	efi.systab->hdr.revision >> 16,
	341	efi.systab->hdr.revision & 0xffff, vendor);
	342
	343	/*
	344	* Let's see what config tables the firmware passed to us.
	345	*/
beacfaac	346	config_tables = early_ioremap(
5b83683f HY	347	efi.systab->tables,
	348	efi.systab->nr_tables * sizeof(efi_config_table_t));
	349	if (config_tables == NULL)
	350	printk(KERN_ERR "Could not map EFI Configuration Table!\n");
	351
	352	printk(KERN_INFO);
	353	for (i = 0; i < efi.systab->nr_tables; i++) {
	354	if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) {
	355	efi.mps = config_tables[i].table;
	356	printk(" MPS=0x%lx ", config_tables[i].table);
	357	} else if (!efi_guidcmp(config_tables[i].guid,
	358	ACPI_20_TABLE_GUID)) {
	359	efi.acpi20 = config_tables[i].table;
	360	printk(" ACPI 2.0=0x%lx ", config_tables[i].table);
	361	} else if (!efi_guidcmp(config_tables[i].guid,
	362	ACPI_TABLE_GUID)) {
	363	efi.acpi = config_tables[i].table;
	364	printk(" ACPI=0x%lx ", config_tables[i].table);
	365	} else if (!efi_guidcmp(config_tables[i].guid,
	366	SMBIOS_TABLE_GUID)) {
	367	efi.smbios = config_tables[i].table;
	368	printk(" SMBIOS=0x%lx ", config_tables[i].table);
03b48632	369	#ifdef CONFIG_X86_UV
a50f70b1 RA	370	} else if (!efi_guidcmp(config_tables[i].guid,
	371	UV_SYSTEM_TABLE_GUID)) {
	372	efi.uv_systab = config_tables[i].table;
	373	printk(" UVsystab=0x%lx ", config_tables[i].table);
03b48632	374	#endif
5b83683f HY	375	} else if (!efi_guidcmp(config_tables[i].guid,
	376	HCDP_TABLE_GUID)) {
	377	efi.hcdp = config_tables[i].table;
	378	printk(" HCDP=0x%lx ", config_tables[i].table);
	379	} else if (!efi_guidcmp(config_tables[i].guid,
	380	UGA_IO_PROTOCOL_GUID)) {
	381	efi.uga = config_tables[i].table;
	382	printk(" UGA=0x%lx ", config_tables[i].table);
	383	}
	384	}
	385	printk("\n");
beacfaac	386	early_iounmap(config_tables,
5b83683f HY	387	efi.systab->nr_tables * sizeof(efi_config_table_t));
	388
	389	/*
	390	* Check out the runtime services table. We need to map
	391	* the runtime services table so that we can grab the physical
	392	* address of several of the EFI runtime functions, needed to
	393	* set the firmware into virtual mode.
	394	*/
beacfaac HY	395	runtime = early_ioremap((unsigned long)efi.systab->runtime,
beacfaac HY	396	sizeof(efi_runtime_services_t));
5b83683f HY	397	if (runtime != NULL) {
	398	/*
	399	* We will only need early access to the following
	400	* two EFI runtime services before set_virtual_address_map
	401	* is invoked.
	402	*/
	403	efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
	404	efi_phys.set_virtual_address_map =
	405	(efi_set_virtual_address_map_t *)
	406	runtime->set_virtual_address_map;
	407	/*
	408	* Make efi_get_time can be called before entering
	409	* virtual mode.
	410	*/
	411	efi.get_time = phys_efi_get_time;
	412	} else
	413	printk(KERN_ERR "Could not map the EFI runtime service "
	414	"table!\n");
beacfaac	415	early_iounmap(runtime, sizeof(efi_runtime_services_t));
5b83683f HY	416
5b83683f HY	417	/* Map the EFI memory map */
beacfaac HY	418	memmap.map = early_ioremap((unsigned long)memmap.phys_map,
beacfaac HY	419	memmap.nr_map * memmap.desc_size);
5b83683f HY	420	if (memmap.map == NULL)
	421	printk(KERN_ERR "Could not map the EFI memory map!\n");
	422	memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
175e438f	423
5b83683f	424	if (memmap.desc_size != sizeof(efi_memory_desc_t))
175e438f RA	425	printk(KERN_WARNING
	426	"Kernel-defined memdesc doesn't match the one from EFI!\n");
	427
200001eb PJ	428	if (add_efi_memmap)
200001eb PJ	429	do_add_efi_memmap();
5b83683f	430
5b83683f HY	431	/* Setup for EFI runtime service */
	432	reboot_type = BOOT_EFI;
	433
5b83683f HY	434	#if EFI_DEBUG
	435	print_efi_memmap();
	436	#endif
	437	}
	438
a2172e25 HY	439	static void __init runtime_code_page_mkexec(void)
	440	{
	441	efi_memory_desc_t *md;
a2172e25	442	void *p;
4a3575fd	443	u64 addr, npages;
a2172e25	444
a2172e25 HY	445	/* Make EFI runtime service code area executable */
	446	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
	447	md = p;
1c083eb2 HY	448
	449	if (md->type != EFI_RUNTIME_SERVICES_CODE)
	450	continue;
	451
4a3575fd HY	452	addr = md->virt_addr;
	453	npages = md->num_pages;
	454	memrange_efi_to_native(&addr, &npages);
	455	set_memory_x(addr, npages);
a2172e25	456	}
a2172e25	457	}
a2172e25	458
5b83683f HY	459	/*
	460	* This function will switch the EFI runtime services to virtual mode.
	461	* Essentially, look through the EFI memmap and map every region that
	462	* has the runtime attribute bit set in its memory descriptor and update
	463	* that memory descriptor with the virtual address obtained from ioremap().
	464	* This enables the runtime services to be called without having to
	465	* thunk back into physical mode for every invocation.
	466	*/
	467	void __init efi_enter_virtual_mode(void)
	468	{
	469	efi_memory_desc_t *md;
	470	efi_status_t status;
1c083eb2	471	unsigned long size;
dd39ecf5	472	u64 end, systab, addr, npages, end_pfn;
1c083eb2	473	void p, va;
5b83683f HY	474
	475	efi.systab = NULL;
	476	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
	477	md = p;
	478	if (!(md->attribute & EFI_MEMORY_RUNTIME))
	479	continue;
1c083eb2 HY	480
	481	size = md->num_pages << EFI_PAGE_SHIFT;
	482	end = md->phys_addr + size;
	483
dd39ecf5 HY	484	end_pfn = PFN_UP(end);
	485	if (end_pfn <= max_low_pfn_mapped
	486	\|\| (end_pfn > (1UL << (32 - PAGE_SHIFT))
	487	&& end_pfn <= max_pfn_mapped))
1c083eb2	488	va = __va(md->phys_addr);
5b83683f	489	else
1c083eb2 HY	490	va = efi_ioremap(md->phys_addr, size);
1c083eb2 HY	491
1c083eb2 HY	492	md->virt_addr = (u64) (unsigned long) va;
	493
	494	if (!va) {
5b83683f HY	495	printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n",
5b83683f HY	496	(unsigned long long)md->phys_addr);
1c083eb2 HY	497	continue;
	498	}
	499
4a3575fd HY	500	if (!(md->attribute & EFI_MEMORY_WB)) {
	501	addr = md->virt_addr;
	502	npages = md->num_pages;
	503	memrange_efi_to_native(&addr, &npages);
	504	set_memory_uc(addr, npages);
	505	}
e85f2051	506
1c083eb2 HY	507	systab = (u64) (unsigned long) efi_phys.systab;
	508	if (md->phys_addr <= systab && systab < end) {
	509	systab += md->virt_addr - md->phys_addr;
	510	efi.systab = (efi_system_table_t *) (unsigned long) systab;
	511	}
5b83683f HY	512	}
	513
	514	BUG_ON(!efi.systab);
	515
	516	status = phys_efi_set_virtual_address_map(
	517	memmap.desc_size * memmap.nr_map,
	518	memmap.desc_size,
	519	memmap.desc_version,
	520	memmap.phys_map);
	521
	522	if (status != EFI_SUCCESS) {
	523	printk(KERN_ALERT "Unable to switch EFI into virtual mode "
	524	"(status=%lx)!\n", status);
	525	panic("EFI call to SetVirtualAddressMap() failed!");
	526	}
	527
	528	/*
	529	* Now that EFI is in virtual mode, update the function
	530	* pointers in the runtime service table to the new virtual addresses.
	531	*
	532	* Call EFI services through wrapper functions.
	533	*/
	534	efi.get_time = virt_efi_get_time;
	535	efi.set_time = virt_efi_set_time;
	536	efi.get_wakeup_time = virt_efi_get_wakeup_time;
	537	efi.set_wakeup_time = virt_efi_set_wakeup_time;
	538	efi.get_variable = virt_efi_get_variable;
	539	efi.get_next_variable = virt_efi_get_next_variable;
	540	efi.set_variable = virt_efi_set_variable;
	541	efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
	542	efi.reset_system = virt_efi_reset_system;
	543	efi.set_virtual_address_map = virt_efi_set_virtual_address_map;
4de0d4a6 HY	544	if (__supported_pte_mask & _PAGE_NX)
4de0d4a6 HY	545	runtime_code_page_mkexec();
a3828064 HY	546	early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
a3828064 HY	547	memmap.map = NULL;
5b83683f HY	548	}
	549
	550	/*
	551	* Convenience functions to obtain memory types and attributes
	552	*/
	553	u32 efi_mem_type(unsigned long phys_addr)
	554	{
	555	efi_memory_desc_t *md;
	556	void *p;
	557
	558	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
	559	md = p;
	560	if ((md->phys_addr <= phys_addr) &&
	561	(phys_addr < (md->phys_addr +
	562	(md->num_pages << EFI_PAGE_SHIFT))))
	563	return md->type;
	564	}
	565	return 0;
	566	}
	567
	568	u64 efi_mem_attributes(unsigned long phys_addr)
	569	{
	570	efi_memory_desc_t *md;
	571	void *p;
	572
	573	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
	574	md = p;
	575	if ((md->phys_addr <= phys_addr) &&
	576	(phys_addr < (md->phys_addr +
	577	(md->num_pages << EFI_PAGE_SHIFT))))
	578	return md->attribute;
	579	}
	580	return 0;
	581	}