[mirror_ubuntu-jammy-kernel.git] / arch / x86 / platform / efi / 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/memblock.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>
#include <asm/x86_init.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 __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;

		switch (md->type) {
		case EFI_LOADER_CODE:
		case EFI_LOADER_DATA:
		case EFI_BOOT_SERVICES_CODE:
		case EFI_BOOT_SERVICES_DATA:
		case EFI_CONVENTIONAL_MEMORY:
			if (md->attribute & EFI_MEMORY_WB)
				e820_type = E820_RAM;
			else
				e820_type = E820_RESERVED;
			break;
		case EFI_ACPI_RECLAIM_MEMORY:
			e820_type = E820_ACPI;
			break;
		case EFI_ACPI_MEMORY_NVS:
			e820_type = E820_NVS;
			break;
		case EFI_UNUSABLE_MEMORY:
			e820_type = E820_UNUSABLE;
			break;
		default:
			/*
			 * EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
			 * EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
			 * EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
			 */
			e820_type = E820_RESERVED;
			break;
		}
		e820_add_region(start, size, e820_type);
	}
	sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
}

void __init efi_memblock_x86_reserve_range(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;
	memblock_x86_reserve_range(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_reserve_boot_services(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;

		if (md->type != EFI_BOOT_SERVICES_CODE &&
		    md->type != EFI_BOOT_SERVICES_DATA)
			continue;

		memblock_x86_reserve_range(start, start + size, "EFI Boot");
	}
}

static void __init efi_free_boot_services(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;

		if (md->type != EFI_BOOT_SERVICES_CODE &&
		    md->type != EFI_BOOT_SERVICES_DATA)
			continue;

		free_bootmem_late(start, size);
	}
}

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) - 1 && *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();

#ifdef CONFIG_X86_32
	x86_platform.get_wallclock = efi_get_time;
	x86_platform.set_wallclock = efi_set_rtc_mmss;
#endif

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

#if EFI_DEBUG
	print_efi_memmap();
#endif
}

void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
{
	u64 addr, npages;

	addr = md->virt_addr;
	npages = md->num_pages;

	memrange_efi_to_native(&addr, &npages);

	if (executable)
		set_memory_x(addr, npages);
	else
		set_memory_nx(addr, npages);
}

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;

		efi_set_executable(md, true);
	}
}

/*
 * 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, *prev_md = NULL;
	efi_status_t status;
	unsigned long size;
	u64 end, systab, addr, npages, end_pfn;
	void *p, *va, *new_memmap = NULL;
	int count = 0;

	efi.systab = NULL;

	/* Merge contiguous regions of the same type and attribute */
	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
		u64 prev_size;
		md = p;

		if (!prev_md) {
			prev_md = md;
			continue;
		}

		if (prev_md->type != md->type ||
		    prev_md->attribute != md->attribute) {
			prev_md = md;
			continue;
		}

		prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;

		if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
			prev_md->num_pages += md->num_pages;
			md->type = EFI_RESERVED_TYPE;
			md->attribute = 0;
			continue;
		}
		prev_md = md;
	}

	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
		md = p;
		if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
		    md->type != EFI_BOOT_SERVICES_CODE &&
		    md->type != EFI_BOOT_SERVICES_DATA)
			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->type);

		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;
		}
		new_memmap = krealloc(new_memmap,
				      (count + 1) * memmap.desc_size,
				      GFP_KERNEL);
		memcpy(new_memmap + (count * memmap.desc_size), md,
		       memmap.desc_size);
		count++;
	}

	BUG_ON(!efi.systab);

	status = phys_efi_set_virtual_address_map(
		memmap.desc_size * count,
		memmap.desc_size,
		memmap.desc_version,
		(efi_memory_desc_t *)__pa(new_memmap));

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

	/*
	 * Thankfully, it does seem that no runtime services other than
	 * SetVirtualAddressMap() will touch boot services code, so we can
	 * get rid of it all at this point
	 */
	efi_free_boot_services();

	/*
	 * 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 = NULL;
	if (__supported_pte_mask & _PAGE_NX)
		runtime_code_page_mkexec();
	early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
	memmap.map = NULL;
	kfree(new_memmap);
}

/*
 * 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>
a9ce6bc1	33	#include <linux/memblock.h>
5b83683f HY	34	#include <linux/spinlock.h>
	35	#include <linux/uaccess.h>
	36	#include <linux/time.h>
	37	#include <linux/io.h>
	38	#include <linux/reboot.h>
	39	#include <linux/bcd.h>
	40
	41	#include <asm/setup.h>
	42	#include <asm/efi.h>
	43	#include <asm/time.h>
a2172e25 HY	44	#include <asm/cacheflush.h>
a2172e25 HY	45	#include <asm/tlbflush.h>
7bd867df	46	#include <asm/x86_init.h>
5b83683f HY	47
	48	#define EFI_DEBUG 1
	49	#define PFX "EFI: "
	50
	51	int efi_enabled;
	52	EXPORT_SYMBOL(efi_enabled);
	53
	54	struct efi efi;
	55	EXPORT_SYMBOL(efi);
	56
	57	struct efi_memory_map memmap;
	58
ecaea42e	59	static struct efi efi_phys __initdata;
5b83683f HY	60	static efi_system_table_t efi_systab __initdata;
5b83683f HY	61
8b2cb7a8 HY	62	static int __init setup_noefi(char *arg)
	63	{
	64	efi_enabled = 0;
	65	return 0;
	66	}
	67	early_param("noefi", setup_noefi);
	68
200001eb PJ	69	int add_efi_memmap;
	70	EXPORT_SYMBOL(add_efi_memmap);
	71
	72	static int __init setup_add_efi_memmap(char *arg)
	73	{
	74	add_efi_memmap = 1;
	75	return 0;
	76	}
	77	early_param("add_efi_memmap", setup_add_efi_memmap);
	78
	79
5b83683f HY	80	static efi_status_t virt_efi_get_time(efi_time_t tm, efi_time_cap_t tc)
	81	{
	82	return efi_call_virt2(get_time, tm, tc);
	83	}
	84
	85	static efi_status_t virt_efi_set_time(efi_time_t *tm)
	86	{
	87	return efi_call_virt1(set_time, tm);
	88	}
	89
	90	static efi_status_t virt_efi_get_wakeup_time(efi_bool_t *enabled,
	91	efi_bool_t *pending,
	92	efi_time_t *tm)
	93	{
	94	return efi_call_virt3(get_wakeup_time,
	95	enabled, pending, tm);
	96	}
	97
	98	static efi_status_t virt_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
	99	{
	100	return efi_call_virt2(set_wakeup_time,
	101	enabled, tm);
	102	}
	103
	104	static efi_status_t virt_efi_get_variable(efi_char16_t *name,
	105	efi_guid_t *vendor,
	106	u32 *attr,
	107	unsigned long *data_size,
	108	void *data)
	109	{
	110	return efi_call_virt5(get_variable,
	111	name, vendor, attr,
	112	data_size, data);
	113	}
	114
	115	static efi_status_t virt_efi_get_next_variable(unsigned long *name_size,
	116	efi_char16_t *name,
	117	efi_guid_t *vendor)
	118	{
	119	return efi_call_virt3(get_next_variable,
	120	name_size, name, vendor);
	121	}
	122
	123	static efi_status_t virt_efi_set_variable(efi_char16_t *name,
	124	efi_guid_t *vendor,
	125	unsigned long attr,
	126	unsigned long data_size,
	127	void *data)
	128	{
	129	return efi_call_virt5(set_variable,
	130	name, vendor, attr,
	131	data_size, data);
	132	}
	133
	134	static efi_status_t virt_efi_get_next_high_mono_count(u32 *count)
	135	{
	136	return efi_call_virt1(get_next_high_mono_count, count);
	137	}
	138
	139	static void virt_efi_reset_system(int reset_type,
	140	efi_status_t status,
	141	unsigned long data_size,
	142	efi_char16_t *data)
	143	{
144	efi_call_virt4(reset_system, reset_type, status,
145	data_size, data);
146	}
147
5b83683f HY	148	static efi_status_t __init phys_efi_set_virtual_address_map(
	149	unsigned long memory_map_size,
	150	unsigned long descriptor_size,
	151	u32 descriptor_version,
	152	efi_memory_desc_t *virtual_map)
	153	{
	154	efi_status_t status;
	155
	156	efi_call_phys_prelog();
	157	status = efi_call_phys4(efi_phys.set_virtual_address_map,
	158	memory_map_size, descriptor_size,
	159	descriptor_version, virtual_map);
	160	efi_call_phys_epilog();
	161	return status;
	162	}
	163
	164	static efi_status_t __init phys_efi_get_time(efi_time_t *tm,
	165	efi_time_cap_t *tc)
	166	{
	167	efi_status_t status;
	168
	169	efi_call_phys_prelog();
	170	status = efi_call_phys2(efi_phys.get_time, tm, tc);
	171	efi_call_phys_epilog();
	172	return status;
	173	}
	174
	175	int efi_set_rtc_mmss(unsigned long nowtime)
	176	{
	177	int real_seconds, real_minutes;
	178	efi_status_t status;
	179	efi_time_t eft;
	180	efi_time_cap_t cap;
	181
	182	status = efi.get_time(&eft, &cap);
	183	if (status != EFI_SUCCESS) {
	184	printk(KERN_ERR "Oops: efitime: can't read time!\n");
	185	return -1;
	186	}
	187
	188	real_seconds = nowtime % 60;
	189	real_minutes = nowtime / 60;
	190	if (((abs(real_minutes - eft.minute) + 15)/30) & 1)
	191	real_minutes += 30;
	192	real_minutes %= 60;
	193	eft.minute = real_minutes;
	194	eft.second = real_seconds;
	195
	196	status = efi.set_time(&eft);
	197	if (status != EFI_SUCCESS) {
	198	printk(KERN_ERR "Oops: efitime: can't write time!\n");
	199	return -1;
	200	}
	201	return 0;
	202	}
	203
	204	unsigned long efi_get_time(void)
	205	{
	206	efi_status_t status;
	207	efi_time_t eft;
	208	efi_time_cap_t cap;
	209
	210	status = efi.get_time(&eft, &cap);
	211	if (status != EFI_SUCCESS)
212	printk(KERN_ERR "Oops: efitime: can't read time!\n");
213
214	return mktime(eft.year, eft.month, eft.day, eft.hour,
215	eft.minute, eft.second);
216	}
217
69c91893 PJ	218	/*
	219	* Tell the kernel about the EFI memory map. This might include
	220	* more than the max 128 entries that can fit in the e820 legacy
	221	* (zeropage) memory map.
	222	*/
	223
200001eb	224	static void __init do_add_efi_memmap(void)
69c91893 PJ	225	{
	226	void *p;
	227
	228	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
	229	efi_memory_desc_t *md = p;
	230	unsigned long long start = md->phys_addr;
	231	unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
	232	int e820_type;
	233
e2a71476 CW	234	switch (md->type) {
	235	case EFI_LOADER_CODE:
	236	case EFI_LOADER_DATA:
	237	case EFI_BOOT_SERVICES_CODE:
	238	case EFI_BOOT_SERVICES_DATA:
	239	case EFI_CONVENTIONAL_MEMORY:
	240	if (md->attribute & EFI_MEMORY_WB)
	241	e820_type = E820_RAM;
	242	else
	243	e820_type = E820_RESERVED;
	244	break;
	245	case EFI_ACPI_RECLAIM_MEMORY:
	246	e820_type = E820_ACPI;
	247	break;
	248	case EFI_ACPI_MEMORY_NVS:
	249	e820_type = E820_NVS;
	250	break;
	251	case EFI_UNUSABLE_MEMORY:
	252	e820_type = E820_UNUSABLE;
	253	break;
	254	default:
	255	/*
	256	* EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
	257	* EFI_RUNTIME_SERVICES_DATA EFI_MEMORY_MAPPED_IO
	258	* EFI_MEMORY_MAPPED_IO_PORT_SPACE EFI_PAL_CODE
	259	*/
69c91893	260	e820_type = E820_RESERVED;
e2a71476 CW	261	break;
e2a71476 CW	262	}
d0be6bde	263	e820_add_region(start, size, e820_type);
69c91893 PJ	264	}
	265	sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
	266	}
	267
a9ce6bc1	268	void __init efi_memblock_x86_reserve_range(void)
ecacf09f HY	269	{
	270	unsigned long pmap;
	271
05486fa7	272	#ifdef CONFIG_X86_32
ecacf09f	273	pmap = boot_params.efi_info.efi_memmap;
05486fa7 PJ	274	#else
	275	pmap = (boot_params.efi_info.efi_memmap \|
	276	((__u64)boot_params.efi_info.efi_memmap_hi<<32));
ecacf09f HY	277	#endif
	278	memmap.phys_map = (void *)pmap;
	279	memmap.nr_map = boot_params.efi_info.efi_memmap_size /
	280	boot_params.efi_info.efi_memdesc_size;
	281	memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
	282	memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
a9ce6bc1	283	memblock_x86_reserve_range(pmap, pmap + memmap.nr_map * memmap.desc_size,
ecacf09f HY	284	"EFI memmap");
	285	}
	286
5b83683f HY	287	#if EFI_DEBUG
	288	static void __init print_efi_memmap(void)
	289	{
	290	efi_memory_desc_t *md;
	291	void *p;
	292	int i;
	293
	294	for (p = memmap.map, i = 0;
	295	p < memmap.map_end;
	296	p += memmap.desc_size, i++) {
	297	md = p;
	298	printk(KERN_INFO PFX "mem%02u: type=%u, attr=0x%llx, "
	299	"range=[0x%016llx-0x%016llx) (%lluMB)\n",
	300	i, md->type, md->attribute, md->phys_addr,
	301	md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
	302	(md->num_pages >> (20 - EFI_PAGE_SHIFT)));
	303	}
	304	}
	305	#endif /* EFI_DEBUG */
	306
916f676f MG	307	void __init efi_reserve_boot_services(void)
	308	{
	309	void *p;
	310
	311	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
	312	efi_memory_desc_t *md = p;
	313	unsigned long long start = md->phys_addr;
	314	unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
	315
	316	if (md->type != EFI_BOOT_SERVICES_CODE &&
	317	md->type != EFI_BOOT_SERVICES_DATA)
	318	continue;
	319
	320	memblock_x86_reserve_range(start, start + size, "EFI Boot");
	321	}
	322	}
	323
	324	static void __init efi_free_boot_services(void)
	325	{
	326	void *p;
	327
	328	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
	329	efi_memory_desc_t *md = p;
	330	unsigned long long start = md->phys_addr;
	331	unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
	332
	333	if (md->type != EFI_BOOT_SERVICES_CODE &&
	334	md->type != EFI_BOOT_SERVICES_DATA)
	335	continue;
	336
	337	free_bootmem_late(start, size);
	338	}
	339	}
	340
5b83683f HY	341	void __init efi_init(void)
	342	{
	343	efi_config_table_t *config_tables;
	344	efi_runtime_services_t *runtime;
	345	efi_char16_t *c16;
	346	char vendor[100] = "unknown";
	347	int i = 0;
	348	void *tmp;
	349
05486fa7	350	#ifdef CONFIG_X86_32
5b83683f	351	efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
05486fa7 PJ	352	#else
	353	efi_phys.systab = (efi_system_table_t *)
	354	(boot_params.efi_info.efi_systab \|
	355	((__u64)boot_params.efi_info.efi_systab_hi<<32));
5b83683f	356	#endif
5b83683f	357
beacfaac HY	358	efi.systab = early_ioremap((unsigned long)efi_phys.systab,
beacfaac HY	359	sizeof(efi_system_table_t));
5b83683f HY	360	if (efi.systab == NULL)
	361	printk(KERN_ERR "Couldn't map the EFI system table!\n");
	362	memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t));
beacfaac	363	early_iounmap(efi.systab, sizeof(efi_system_table_t));
5b83683f HY	364	efi.systab = &efi_systab;
	365
	366	/*
	367	* Verify the EFI Table
	368	*/
	369	if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
	370	printk(KERN_ERR "EFI system table signature incorrect!\n");
	371	if ((efi.systab->hdr.revision >> 16) == 0)
	372	printk(KERN_ERR "Warning: EFI system table version "
	373	"%d.%02d, expected 1.00 or greater!\n",
	374	efi.systab->hdr.revision >> 16,
	375	efi.systab->hdr.revision & 0xffff);
	376
	377	/*
	378	* Show what we know for posterity
	379	*/
beacfaac	380	c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
5b83683f	381	if (c16) {
fdb8a427	382	for (i = 0; i < sizeof(vendor) - 1 && *c16; ++i)
5b83683f HY	383	vendor[i] = *c16++;
	384	vendor[i] = '\0';
	385	} else
	386	printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
beacfaac	387	early_iounmap(tmp, 2);
5b83683f	388
3235dc3f	389	printk(KERN_INFO "EFI v%u.%.02u by %s\n",
5b83683f HY	390	efi.systab->hdr.revision >> 16,
	391	efi.systab->hdr.revision & 0xffff, vendor);
	392
	393	/*
	394	* Let's see what config tables the firmware passed to us.
	395	*/
beacfaac	396	config_tables = early_ioremap(
5b83683f HY	397	efi.systab->tables,
	398	efi.systab->nr_tables * sizeof(efi_config_table_t));
	399	if (config_tables == NULL)
	400	printk(KERN_ERR "Could not map EFI Configuration Table!\n");
	401
	402	printk(KERN_INFO);
	403	for (i = 0; i < efi.systab->nr_tables; i++) {
	404	if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) {
	405	efi.mps = config_tables[i].table;
	406	printk(" MPS=0x%lx ", config_tables[i].table);
	407	} else if (!efi_guidcmp(config_tables[i].guid,
	408	ACPI_20_TABLE_GUID)) {
	409	efi.acpi20 = config_tables[i].table;
	410	printk(" ACPI 2.0=0x%lx ", config_tables[i].table);
	411	} else if (!efi_guidcmp(config_tables[i].guid,
	412	ACPI_TABLE_GUID)) {
	413	efi.acpi = config_tables[i].table;
	414	printk(" ACPI=0x%lx ", config_tables[i].table);
	415	} else if (!efi_guidcmp(config_tables[i].guid,
	416	SMBIOS_TABLE_GUID)) {
	417	efi.smbios = config_tables[i].table;
	418	printk(" SMBIOS=0x%lx ", config_tables[i].table);
03b48632	419	#ifdef CONFIG_X86_UV
a50f70b1 RA	420	} else if (!efi_guidcmp(config_tables[i].guid,
	421	UV_SYSTEM_TABLE_GUID)) {
	422	efi.uv_systab = config_tables[i].table;
	423	printk(" UVsystab=0x%lx ", config_tables[i].table);
03b48632	424	#endif
5b83683f HY	425	} else if (!efi_guidcmp(config_tables[i].guid,
	426	HCDP_TABLE_GUID)) {
	427	efi.hcdp = config_tables[i].table;
	428	printk(" HCDP=0x%lx ", config_tables[i].table);
	429	} else if (!efi_guidcmp(config_tables[i].guid,
	430	UGA_IO_PROTOCOL_GUID)) {
	431	efi.uga = config_tables[i].table;
	432	printk(" UGA=0x%lx ", config_tables[i].table);
	433	}
	434	}
	435	printk("\n");
beacfaac	436	early_iounmap(config_tables,
5b83683f HY	437	efi.systab->nr_tables * sizeof(efi_config_table_t));
	438
	439	/*
	440	* Check out the runtime services table. We need to map
	441	* the runtime services table so that we can grab the physical
	442	* address of several of the EFI runtime functions, needed to
	443	* set the firmware into virtual mode.
	444	*/
beacfaac HY	445	runtime = early_ioremap((unsigned long)efi.systab->runtime,
beacfaac HY	446	sizeof(efi_runtime_services_t));
5b83683f HY	447	if (runtime != NULL) {
	448	/*
	449	* We will only need early access to the following
	450	* two EFI runtime services before set_virtual_address_map
	451	* is invoked.
	452	*/
	453	efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
	454	efi_phys.set_virtual_address_map =
	455	(efi_set_virtual_address_map_t *)
	456	runtime->set_virtual_address_map;
	457	/*
	458	* Make efi_get_time can be called before entering
	459	* virtual mode.
	460	*/
	461	efi.get_time = phys_efi_get_time;
	462	} else
	463	printk(KERN_ERR "Could not map the EFI runtime service "
	464	"table!\n");
beacfaac	465	early_iounmap(runtime, sizeof(efi_runtime_services_t));
5b83683f HY	466
5b83683f HY	467	/* Map the EFI memory map */
beacfaac HY	468	memmap.map = early_ioremap((unsigned long)memmap.phys_map,
beacfaac HY	469	memmap.nr_map * memmap.desc_size);
5b83683f HY	470	if (memmap.map == NULL)
	471	printk(KERN_ERR "Could not map the EFI memory map!\n");
	472	memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
175e438f	473
5b83683f	474	if (memmap.desc_size != sizeof(efi_memory_desc_t))
175e438f RA	475	printk(KERN_WARNING
	476	"Kernel-defined memdesc doesn't match the one from EFI!\n");
	477
200001eb PJ	478	if (add_efi_memmap)
200001eb PJ	479	do_add_efi_memmap();
5b83683f	480
772be899	481	#ifdef CONFIG_X86_32
7bd867df FT	482	x86_platform.get_wallclock = efi_get_time;
7bd867df FT	483	x86_platform.set_wallclock = efi_set_rtc_mmss;
772be899	484	#endif
7bd867df	485
5b83683f HY	486	/* Setup for EFI runtime service */
	487	reboot_type = BOOT_EFI;
	488
5b83683f HY	489	#if EFI_DEBUG
	490	print_efi_memmap();
	491	#endif
	492	}
	493
9cd2b07c MG	494	void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
	495	{
	496	u64 addr, npages;
	497
	498	addr = md->virt_addr;
	499	npages = md->num_pages;
	500
	501	memrange_efi_to_native(&addr, &npages);
	502
	503	if (executable)
	504	set_memory_x(addr, npages);
	505	else
	506	set_memory_nx(addr, npages);
	507	}
	508
a2172e25 HY	509	static void __init runtime_code_page_mkexec(void)
	510	{
	511	efi_memory_desc_t *md;
a2172e25 HY	512	void *p;
a2172e25 HY	513
a2172e25 HY	514	/* Make EFI runtime service code area executable */
	515	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
	516	md = p;
1c083eb2 HY	517
	518	if (md->type != EFI_RUNTIME_SERVICES_CODE)
	519	continue;
	520
9cd2b07c	521	efi_set_executable(md, true);
a2172e25	522	}
a2172e25	523	}
a2172e25	524
5b83683f HY	525	/*
	526	* This function will switch the EFI runtime services to virtual mode.
	527	* Essentially, look through the EFI memmap and map every region that
	528	* has the runtime attribute bit set in its memory descriptor and update
	529	* that memory descriptor with the virtual address obtained from ioremap().
	530	* This enables the runtime services to be called without having to
	531	* thunk back into physical mode for every invocation.
	532	*/
	533	void __init efi_enter_virtual_mode(void)
	534	{
202f9d0a	535	efi_memory_desc_t md, prev_md = NULL;
5b83683f	536	efi_status_t status;
1c083eb2	537	unsigned long size;
dd39ecf5	538	u64 end, systab, addr, npages, end_pfn;
7cb00b72 MG	539	void p, va, *new_memmap = NULL;
7cb00b72 MG	540	int count = 0;
5b83683f HY	541
5b83683f HY	542	efi.systab = NULL;
202f9d0a MG	543
	544	/* Merge contiguous regions of the same type and attribute */
	545	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
	546	u64 prev_size;
	547	md = p;
	548
	549	if (!prev_md) {
	550	prev_md = md;
	551	continue;
	552	}
	553
	554	if (prev_md->type != md->type \|\|
	555	prev_md->attribute != md->attribute) {
	556	prev_md = md;
	557	continue;
	558	}
	559
	560	prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
	561
	562	if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
	563	prev_md->num_pages += md->num_pages;
	564	md->type = EFI_RESERVED_TYPE;
	565	md->attribute = 0;
	566	continue;
	567	}
	568	prev_md = md;
	569	}
	570
5b83683f HY	571	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
5b83683f HY	572	md = p;
916f676f MG	573	if (!(md->attribute & EFI_MEMORY_RUNTIME) &&
	574	md->type != EFI_BOOT_SERVICES_CODE &&
	575	md->type != EFI_BOOT_SERVICES_DATA)
5b83683f	576	continue;
1c083eb2 HY	577
	578	size = md->num_pages << EFI_PAGE_SHIFT;
	579	end = md->phys_addr + size;
	580
dd39ecf5 HY	581	end_pfn = PFN_UP(end);
	582	if (end_pfn <= max_low_pfn_mapped
	583	\|\| (end_pfn > (1UL << (32 - PAGE_SHIFT))
	584	&& end_pfn <= max_pfn_mapped))
1c083eb2	585	va = __va(md->phys_addr);
5b83683f	586	else
6a7bbd57	587	va = efi_ioremap(md->phys_addr, size, md->type);
1c083eb2	588
1c083eb2 HY	589	md->virt_addr = (u64) (unsigned long) va;
	590
	591	if (!va) {
5b83683f HY	592	printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n",
5b83683f HY	593	(unsigned long long)md->phys_addr);
1c083eb2 HY	594	continue;
	595	}
	596
4a3575fd HY	597	if (!(md->attribute & EFI_MEMORY_WB)) {
	598	addr = md->virt_addr;
	599	npages = md->num_pages;
	600	memrange_efi_to_native(&addr, &npages);
	601	set_memory_uc(addr, npages);
	602	}
e85f2051	603
1c083eb2 HY	604	systab = (u64) (unsigned long) efi_phys.systab;
	605	if (md->phys_addr <= systab && systab < end) {
	606	systab += md->virt_addr - md->phys_addr;
	607	efi.systab = (efi_system_table_t *) (unsigned long) systab;
	608	}
7cb00b72 MG	609	new_memmap = krealloc(new_memmap,
	610	(count + 1) * memmap.desc_size,
	611	GFP_KERNEL);
	612	memcpy(new_memmap + (count * memmap.desc_size), md,
	613	memmap.desc_size);
	614	count++;
5b83683f HY	615	}
	616
	617	BUG_ON(!efi.systab);
	618
	619	status = phys_efi_set_virtual_address_map(
7cb00b72	620	memmap.desc_size * count,
5b83683f HY	621	memmap.desc_size,
5b83683f HY	622	memmap.desc_version,
7cb00b72	623	(efi_memory_desc_t *)__pa(new_memmap));
5b83683f HY	624
	625	if (status != EFI_SUCCESS) {
	626	printk(KERN_ALERT "Unable to switch EFI into virtual mode "
	627	"(status=%lx)!\n", status);
	628	panic("EFI call to SetVirtualAddressMap() failed!");
	629	}
	630
916f676f MG	631	/*
	632	* Thankfully, it does seem that no runtime services other than
	633	* SetVirtualAddressMap() will touch boot services code, so we can
	634	* get rid of it all at this point
	635	*/
	636	efi_free_boot_services();
	637
5b83683f HY	638	/*
	639	* Now that EFI is in virtual mode, update the function
	640	* pointers in the runtime service table to the new virtual addresses.
	641	*
	642	* Call EFI services through wrapper functions.
	643	*/
	644	efi.get_time = virt_efi_get_time;
	645	efi.set_time = virt_efi_set_time;
	646	efi.get_wakeup_time = virt_efi_get_wakeup_time;
	647	efi.set_wakeup_time = virt_efi_set_wakeup_time;
	648	efi.get_variable = virt_efi_get_variable;
	649	efi.get_next_variable = virt_efi_get_next_variable;
	650	efi.set_variable = virt_efi_set_variable;
	651	efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
	652	efi.reset_system = virt_efi_reset_system;
2b5e8ef3	653	efi.set_virtual_address_map = NULL;
4de0d4a6 HY	654	if (__supported_pte_mask & _PAGE_NX)
4de0d4a6 HY	655	runtime_code_page_mkexec();
a3828064 HY	656	early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
a3828064 HY	657	memmap.map = NULL;
7cb00b72	658	kfree(new_memmap);
5b83683f HY	659	}
	660
	661	/*
	662	* Convenience functions to obtain memory types and attributes
	663	*/
	664	u32 efi_mem_type(unsigned long phys_addr)
	665	{
	666	efi_memory_desc_t *md;
	667	void *p;
	668
	669	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
	670	md = p;
	671	if ((md->phys_addr <= phys_addr) &&
	672	(phys_addr < (md->phys_addr +
	673	(md->num_pages << EFI_PAGE_SHIFT))))
	674	return md->type;
	675	}
	676	return 0;
	677	}
	678
	679	u64 efi_mem_attributes(unsigned long phys_addr)
	680	{
	681	efi_memory_desc_t *md;
	682	void *p;
	683
	684	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
	685	md = p;
	686	if ((md->phys_addr <= phys_addr) &&
	687	(phys_addr < (md->phys_addr +
	688	(md->num_pages << EFI_PAGE_SHIFT))))
	689	return md->attribute;
	690	}
	691	return 0;
	692	}