[linux-2.6-block.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);

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 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;

	pmap = boot_params.efi_info.efi_memmap;
#ifdef CONFIG_X86_64
	pmap += (__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;

	efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
#ifdef CONFIG_X86_64
	efi_phys.systab = (void *)efi_phys.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);
		} 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");
	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;
	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 (PFN_UP(end) <= 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
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
69c91893 PJ	216	/*
	217	* Tell the kernel about the EFI memory map. This might include
	218	* more than the max 128 entries that can fit in the e820 legacy
	219	* (zeropage) memory map.
	220	*/
	221
	222	static void __init add_efi_memmap(void)
	223	{
	224	void *p;
	225
	226	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
	227	efi_memory_desc_t *md = p;
	228	unsigned long long start = md->phys_addr;
	229	unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
	230	int e820_type;
	231
	232	if (md->attribute & EFI_MEMORY_WB)
	233	e820_type = E820_RAM;
	234	else
	235	e820_type = E820_RESERVED;
d0be6bde	236	e820_add_region(start, size, e820_type);
69c91893 PJ	237	}
	238	sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
	239	}
	240
ecacf09f HY	241	void __init efi_reserve_early(void)
	242	{
	243	unsigned long pmap;
	244
	245	pmap = boot_params.efi_info.efi_memmap;
	246	#ifdef CONFIG_X86_64
	247	pmap += (__u64)boot_params.efi_info.efi_memmap_hi << 32;
	248	#endif
	249	memmap.phys_map = (void *)pmap;
	250	memmap.nr_map = boot_params.efi_info.efi_memmap_size /
	251	boot_params.efi_info.efi_memdesc_size;
	252	memmap.desc_version = boot_params.efi_info.efi_memdesc_version;
	253	memmap.desc_size = boot_params.efi_info.efi_memdesc_size;
	254	reserve_early(pmap, pmap + memmap.nr_map * memmap.desc_size,
	255	"EFI memmap");
	256	}
	257
5b83683f HY	258	#if EFI_DEBUG
	259	static void __init print_efi_memmap(void)
	260	{
	261	efi_memory_desc_t *md;
	262	void *p;
	263	int i;
	264
	265	for (p = memmap.map, i = 0;
	266	p < memmap.map_end;
	267	p += memmap.desc_size, i++) {
	268	md = p;
	269	printk(KERN_INFO PFX "mem%02u: type=%u, attr=0x%llx, "
	270	"range=[0x%016llx-0x%016llx) (%lluMB)\n",
	271	i, md->type, md->attribute, md->phys_addr,
	272	md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
	273	(md->num_pages >> (20 - EFI_PAGE_SHIFT)));
	274	}
	275	}
	276	#endif /* EFI_DEBUG */
	277
	278	void __init efi_init(void)
	279	{
	280	efi_config_table_t *config_tables;
	281	efi_runtime_services_t *runtime;
	282	efi_char16_t *c16;
	283	char vendor[100] = "unknown";
	284	int i = 0;
	285	void *tmp;
	286
5b83683f	287	efi_phys.systab = (efi_system_table_t *)boot_params.efi_info.efi_systab;
ecacf09f HY	288	#ifdef CONFIG_X86_64
	289	efi_phys.systab = (void *)efi_phys.systab +
	290	((__u64)boot_params.efi_info.efi_systab_hi<<32);
5b83683f	291	#endif
5b83683f	292
beacfaac HY	293	efi.systab = early_ioremap((unsigned long)efi_phys.systab,
beacfaac HY	294	sizeof(efi_system_table_t));
5b83683f HY	295	if (efi.systab == NULL)
	296	printk(KERN_ERR "Couldn't map the EFI system table!\n");
	297	memcpy(&efi_systab, efi.systab, sizeof(efi_system_table_t));
beacfaac	298	early_iounmap(efi.systab, sizeof(efi_system_table_t));
5b83683f HY	299	efi.systab = &efi_systab;
	300
	301	/*
	302	* Verify the EFI Table
	303	*/
	304	if (efi.systab->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
	305	printk(KERN_ERR "EFI system table signature incorrect!\n");
	306	if ((efi.systab->hdr.revision >> 16) == 0)
	307	printk(KERN_ERR "Warning: EFI system table version "
	308	"%d.%02d, expected 1.00 or greater!\n",
	309	efi.systab->hdr.revision >> 16,
	310	efi.systab->hdr.revision & 0xffff);
	311
	312	/*
	313	* Show what we know for posterity
	314	*/
beacfaac	315	c16 = tmp = early_ioremap(efi.systab->fw_vendor, 2);
5b83683f HY	316	if (c16) {
	317	for (i = 0; i < sizeof(vendor) && *c16; ++i)
	318	vendor[i] = *c16++;
	319	vendor[i] = '\0';
	320	} else
	321	printk(KERN_ERR PFX "Could not map the firmware vendor!\n");
beacfaac	322	early_iounmap(tmp, 2);
5b83683f HY	323
	324	printk(KERN_INFO "EFI v%u.%.02u by %s \n",
	325	efi.systab->hdr.revision >> 16,
	326	efi.systab->hdr.revision & 0xffff, vendor);
	327
	328	/*
	329	* Let's see what config tables the firmware passed to us.
	330	*/
beacfaac	331	config_tables = early_ioremap(
5b83683f HY	332	efi.systab->tables,
	333	efi.systab->nr_tables * sizeof(efi_config_table_t));
	334	if (config_tables == NULL)
	335	printk(KERN_ERR "Could not map EFI Configuration Table!\n");
	336
	337	printk(KERN_INFO);
	338	for (i = 0; i < efi.systab->nr_tables; i++) {
	339	if (!efi_guidcmp(config_tables[i].guid, MPS_TABLE_GUID)) {
	340	efi.mps = config_tables[i].table;
	341	printk(" MPS=0x%lx ", config_tables[i].table);
	342	} else if (!efi_guidcmp(config_tables[i].guid,
	343	ACPI_20_TABLE_GUID)) {
	344	efi.acpi20 = config_tables[i].table;
	345	printk(" ACPI 2.0=0x%lx ", config_tables[i].table);
	346	} else if (!efi_guidcmp(config_tables[i].guid,
	347	ACPI_TABLE_GUID)) {
	348	efi.acpi = config_tables[i].table;
	349	printk(" ACPI=0x%lx ", config_tables[i].table);
	350	} else if (!efi_guidcmp(config_tables[i].guid,
	351	SMBIOS_TABLE_GUID)) {
	352	efi.smbios = config_tables[i].table;
	353	printk(" SMBIOS=0x%lx ", config_tables[i].table);
	354	} else if (!efi_guidcmp(config_tables[i].guid,
	355	HCDP_TABLE_GUID)) {
	356	efi.hcdp = config_tables[i].table;
	357	printk(" HCDP=0x%lx ", config_tables[i].table);
	358	} else if (!efi_guidcmp(config_tables[i].guid,
	359	UGA_IO_PROTOCOL_GUID)) {
	360	efi.uga = config_tables[i].table;
	361	printk(" UGA=0x%lx ", config_tables[i].table);
	362	}
	363	}
	364	printk("\n");
beacfaac	365	early_iounmap(config_tables,
5b83683f HY	366	efi.systab->nr_tables * sizeof(efi_config_table_t));
	367
	368	/*
	369	* Check out the runtime services table. We need to map
	370	* the runtime services table so that we can grab the physical
	371	* address of several of the EFI runtime functions, needed to
	372	* set the firmware into virtual mode.
	373	*/
beacfaac HY	374	runtime = early_ioremap((unsigned long)efi.systab->runtime,
beacfaac HY	375	sizeof(efi_runtime_services_t));
5b83683f HY	376	if (runtime != NULL) {
	377	/*
	378	* We will only need early access to the following
	379	* two EFI runtime services before set_virtual_address_map
	380	* is invoked.
	381	*/
	382	efi_phys.get_time = (efi_get_time_t *)runtime->get_time;
	383	efi_phys.set_virtual_address_map =
	384	(efi_set_virtual_address_map_t *)
	385	runtime->set_virtual_address_map;
	386	/*
	387	* Make efi_get_time can be called before entering
	388	* virtual mode.
	389	*/
	390	efi.get_time = phys_efi_get_time;
	391	} else
	392	printk(KERN_ERR "Could not map the EFI runtime service "
	393	"table!\n");
beacfaac	394	early_iounmap(runtime, sizeof(efi_runtime_services_t));
5b83683f HY	395
5b83683f HY	396	/* Map the EFI memory map */
beacfaac HY	397	memmap.map = early_ioremap((unsigned long)memmap.phys_map,
beacfaac HY	398	memmap.nr_map * memmap.desc_size);
5b83683f HY	399	if (memmap.map == NULL)
	400	printk(KERN_ERR "Could not map the EFI memory map!\n");
	401	memmap.map_end = memmap.map + (memmap.nr_map * memmap.desc_size);
	402	if (memmap.desc_size != sizeof(efi_memory_desc_t))
	403	printk(KERN_WARNING "Kernel-defined memdesc"
	404	"doesn't match the one from EFI!\n");
69c91893	405	add_efi_memmap();
5b83683f	406
5b83683f HY	407	/* Setup for EFI runtime service */
	408	reboot_type = BOOT_EFI;
	409
5b83683f HY	410	#if EFI_DEBUG
	411	print_efi_memmap();
	412	#endif
	413	}
	414
a2172e25 HY	415	static void __init runtime_code_page_mkexec(void)
	416	{
	417	efi_memory_desc_t *md;
a2172e25	418	void *p;
4a3575fd	419	u64 addr, npages;
a2172e25	420
a2172e25 HY	421	/* Make EFI runtime service code area executable */
	422	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
	423	md = p;
1c083eb2 HY	424
	425	if (md->type != EFI_RUNTIME_SERVICES_CODE)
	426	continue;
	427
4a3575fd HY	428	addr = md->virt_addr;
	429	npages = md->num_pages;
	430	memrange_efi_to_native(&addr, &npages);
	431	set_memory_x(addr, npages);
a2172e25	432	}
a2172e25	433	}
a2172e25	434
5b83683f HY	435	/*
	436	* This function will switch the EFI runtime services to virtual mode.
	437	* Essentially, look through the EFI memmap and map every region that
	438	* has the runtime attribute bit set in its memory descriptor and update
	439	* that memory descriptor with the virtual address obtained from ioremap().
	440	* This enables the runtime services to be called without having to
	441	* thunk back into physical mode for every invocation.
	442	*/
	443	void __init efi_enter_virtual_mode(void)
	444	{
	445	efi_memory_desc_t *md;
	446	efi_status_t status;
1c083eb2	447	unsigned long size;
4a3575fd	448	u64 end, systab, addr, npages;
1c083eb2	449	void p, va;
5b83683f HY	450
	451	efi.systab = NULL;
	452	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
	453	md = p;
	454	if (!(md->attribute & EFI_MEMORY_RUNTIME))
	455	continue;
1c083eb2 HY	456
	457	size = md->num_pages << EFI_PAGE_SHIFT;
	458	end = md->phys_addr + size;
	459
4a3575fd	460	if (PFN_UP(end) <= max_pfn_mapped)
1c083eb2	461	va = __va(md->phys_addr);
5b83683f	462	else
1c083eb2 HY	463	va = efi_ioremap(md->phys_addr, size);
1c083eb2 HY	464
1c083eb2 HY	465	md->virt_addr = (u64) (unsigned long) va;
	466
	467	if (!va) {
5b83683f HY	468	printk(KERN_ERR PFX "ioremap of 0x%llX failed!\n",
5b83683f HY	469	(unsigned long long)md->phys_addr);
1c083eb2 HY	470	continue;
	471	}
	472
4a3575fd HY	473	if (!(md->attribute & EFI_MEMORY_WB)) {
	474	addr = md->virt_addr;
	475	npages = md->num_pages;
	476	memrange_efi_to_native(&addr, &npages);
	477	set_memory_uc(addr, npages);
	478	}
e85f2051	479
1c083eb2 HY	480	systab = (u64) (unsigned long) efi_phys.systab;
	481	if (md->phys_addr <= systab && systab < end) {
	482	systab += md->virt_addr - md->phys_addr;
	483	efi.systab = (efi_system_table_t *) (unsigned long) systab;
	484	}
5b83683f HY	485	}
	486
	487	BUG_ON(!efi.systab);
	488
	489	status = phys_efi_set_virtual_address_map(
	490	memmap.desc_size * memmap.nr_map,
	491	memmap.desc_size,
	492	memmap.desc_version,
	493	memmap.phys_map);
	494
	495	if (status != EFI_SUCCESS) {
	496	printk(KERN_ALERT "Unable to switch EFI into virtual mode "
	497	"(status=%lx)!\n", status);
	498	panic("EFI call to SetVirtualAddressMap() failed!");
	499	}
	500
	501	/*
	502	* Now that EFI is in virtual mode, update the function
	503	* pointers in the runtime service table to the new virtual addresses.
	504	*
	505	* Call EFI services through wrapper functions.
	506	*/
	507	efi.get_time = virt_efi_get_time;
	508	efi.set_time = virt_efi_set_time;
	509	efi.get_wakeup_time = virt_efi_get_wakeup_time;
	510	efi.set_wakeup_time = virt_efi_set_wakeup_time;
	511	efi.get_variable = virt_efi_get_variable;
	512	efi.get_next_variable = virt_efi_get_next_variable;
	513	efi.set_variable = virt_efi_set_variable;
	514	efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
	515	efi.reset_system = virt_efi_reset_system;
	516	efi.set_virtual_address_map = virt_efi_set_virtual_address_map;
4de0d4a6 HY	517	if (__supported_pte_mask & _PAGE_NX)
4de0d4a6 HY	518	runtime_code_page_mkexec();
a3828064 HY	519	early_iounmap(memmap.map, memmap.nr_map * memmap.desc_size);
a3828064 HY	520	memmap.map = NULL;
5b83683f HY	521	}
	522
	523	/*
	524	* Convenience functions to obtain memory types and attributes
	525	*/
	526	u32 efi_mem_type(unsigned long phys_addr)
	527	{
	528	efi_memory_desc_t *md;
	529	void *p;
	530
	531	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
	532	md = p;
	533	if ((md->phys_addr <= phys_addr) &&
	534	(phys_addr < (md->phys_addr +
	535	(md->num_pages << EFI_PAGE_SHIFT))))
	536	return md->type;
	537	}
	538	return 0;
	539	}
	540
	541	u64 efi_mem_attributes(unsigned long phys_addr)
	542	{
	543	efi_memory_desc_t *md;
	544	void *p;
	545
	546	for (p = memmap.map; p < memmap.map_end; p += memmap.desc_size) {
	547	md = p;
	548	if ((md->phys_addr <= phys_addr) &&
	549	(phys_addr < (md->phys_addr +
	550	(md->num_pages << EFI_PAGE_SHIFT))))
	551	return md->attribute;
	552	}
	553	return 0;
	554	}