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  • 2020-06-01
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efi_boottime.c

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  • Forked from Reform / reform-boundary-uboot
    4152 commits behind the upstream repository.
    efi_boottime.c 62.02 KiB
    /*
     *  EFI application boot time services
     *
     *  Copyright (c) 2016 Alexander Graf
     *
     *  SPDX-License-Identifier:     GPL-2.0+
     */
    
    #include <common.h>
    #include <div64.h>
    #include <efi_loader.h>
    #include <environment.h>
    #include <malloc.h>
    #include <asm/global_data.h>
    #include <libfdt_env.h>
    #include <u-boot/crc.h>
    #include <bootm.h>
    #include <inttypes.h>
    #include <watchdog.h>
    
    DECLARE_GLOBAL_DATA_PTR;
    
    /* Task priority level */
    static efi_uintn_t efi_tpl = TPL_APPLICATION;
    
    /* This list contains all the EFI objects our payload has access to */
    LIST_HEAD(efi_obj_list);
    
    /*
     * If we're running on nasty systems (32bit ARM booting into non-EFI Linux)
     * we need to do trickery with caches. Since we don't want to break the EFI
     * aware boot path, only apply hacks when loading exiting directly (breaking
     * direct Linux EFI booting along the way - oh well).
     */
    static bool efi_is_direct_boot = true;
    
    /*
     * EFI can pass arbitrary additional "tables" containing vendor specific
     * information to the payload. One such table is the FDT table which contains
     * a pointer to a flattened device tree blob.
     *
     * In most cases we want to pass an FDT to the payload, so reserve one slot of
     * config table space for it. The pointer gets populated by do_bootefi_exec().
     */
    static struct efi_configuration_table __efi_runtime_data efi_conf_table[2];
    
    #ifdef CONFIG_ARM
    /*
     * The "gd" pointer lives in a register on ARM and AArch64 that we declare
     * fixed when compiling U-Boot. However, the payload does not know about that
     * restriction so we need to manually swap its and our view of that register on
     * EFI callback entry/exit.
     */
    static volatile void *efi_gd, *app_gd;
    #endif
    
    static int entry_count;
    static int nesting_level;
    
    /* Called on every callback entry */
    int __efi_entry_check(void)
    {
    	int ret = entry_count++ == 0;
    #ifdef CONFIG_ARM
    	assert(efi_gd);
    	app_gd = gd;
    	gd = efi_gd;
    #endif
    	return ret;
    }
    
    /* Called on every callback exit */
    int __efi_exit_check(void)
    {
    	int ret = --entry_count == 0;
    #ifdef CONFIG_ARM
    	gd = app_gd;
    #endif
    	return ret;
    }
    
    /* Called from do_bootefi_exec() */
    void efi_save_gd(void)
    {
    #ifdef CONFIG_ARM
    	efi_gd = gd;
    #endif
    }
    
    /*
     * Special case handler for error/abort that just forces things back
     * to u-boot world so we can dump out an abort msg, without any care
     * about returning back to UEFI world.
     */
    void efi_restore_gd(void)
    {
    #ifdef CONFIG_ARM
    	/* Only restore if we're already in EFI context */
    	if (!efi_gd)
    		return;
    	gd = efi_gd;
    #endif
    }
    
    /*
     * Two spaces per indent level, maxing out at 10.. which ought to be
     * enough for anyone ;-)
     */
    static const char *indent_string(int level)
    {
    	const char *indent = "                    ";
    	const int max = strlen(indent);
    	level = min(max, level * 2);
    	return &indent[max - level];
    }
    
    const char *__efi_nesting(void)
    {
    	return indent_string(nesting_level);
    }
    
    const char *__efi_nesting_inc(void)
    {
    	return indent_string(nesting_level++);
    }
    
    const char *__efi_nesting_dec(void)
    {
    	return indent_string(--nesting_level);
    }
    
    /*
     * Queue an EFI event.
     *
     * This function queues the notification function of the event for future
     * execution.
     *
     * The notification function is called if the task priority level of the
     * event is higher than the current task priority level.
     *
     * For the SignalEvent service see efi_signal_event_ext.
     *
     * @event	event to signal
     */
    void efi_signal_event(struct efi_event *event)
    {
    	if (event->notify_function) {
    		event->is_queued = true;
    		/* Check TPL */
    		if (efi_tpl >= event->notify_tpl)
    			return;
    		EFI_CALL_VOID(event->notify_function(event,
    						     event->notify_context));
    	}
    	event->is_queued = false;
    }
    
    /*
     * Raise the task priority level.
     *
     * This function implements the RaiseTpl service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @new_tpl	new value of the task priority level
     * @return	old value of the task priority level
     */
    static unsigned long EFIAPI efi_raise_tpl(efi_uintn_t new_tpl)
    {
    	efi_uintn_t old_tpl = efi_tpl;
    
    	EFI_ENTRY("0x%zx", new_tpl);
    
    	if (new_tpl < efi_tpl)
    		debug("WARNING: new_tpl < current_tpl in %s\n", __func__);
    	efi_tpl = new_tpl;
    	if (efi_tpl > TPL_HIGH_LEVEL)
    		efi_tpl = TPL_HIGH_LEVEL;
    
    	EFI_EXIT(EFI_SUCCESS);
    	return old_tpl;
    }
    
    /*
     * Lower the task priority level.
     *
     * This function implements the RestoreTpl service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @old_tpl	value of the task priority level to be restored
     */
    static void EFIAPI efi_restore_tpl(efi_uintn_t old_tpl)
    {
    	EFI_ENTRY("0x%zx", old_tpl);
    
    	if (old_tpl > efi_tpl)
    		debug("WARNING: old_tpl > current_tpl in %s\n", __func__);
    	efi_tpl = old_tpl;
    	if (efi_tpl > TPL_HIGH_LEVEL)
    		efi_tpl = TPL_HIGH_LEVEL;
    
    	EFI_EXIT(EFI_SUCCESS);
    }
    
    /*
     * Allocate memory pages.
     *
     * This function implements the AllocatePages service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @type		type of allocation to be performed
     * @memory_type		usage type of the allocated memory
     * @pages		number of pages to be allocated
     * @memory		allocated memory
     * @return		status code
     */
    static efi_status_t EFIAPI efi_allocate_pages_ext(int type, int memory_type,
    						  efi_uintn_t pages,
    						  uint64_t *memory)
    {
    	efi_status_t r;
    
    	EFI_ENTRY("%d, %d, 0x%zx, %p", type, memory_type, pages, memory);
    	r = efi_allocate_pages(type, memory_type, pages, memory);
    	return EFI_EXIT(r);
    }
    
    /*
     * Free memory pages.
     *
     * This function implements the FreePages service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @memory	start of the memory area to be freed
     * @pages	number of pages to be freed
     * @return	status code
     */
    static efi_status_t EFIAPI efi_free_pages_ext(uint64_t memory,
    					      efi_uintn_t pages)
    {
    	efi_status_t r;
    
    	EFI_ENTRY("%"PRIx64", 0x%zx", memory, pages);
    	r = efi_free_pages(memory, pages);
    	return EFI_EXIT(r);
    }
    
    /*
     * Get map describing memory usage.
     *
     * This function implements the GetMemoryMap service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @memory_map_size	on entry the size, in bytes, of the memory map buffer,
     *			on exit the size of the copied memory map
     * @memory_map		buffer to which the memory map is written
     * @map_key		key for the memory map
     * @descriptor_size	size of an individual memory descriptor
     * @descriptor_version	version number of the memory descriptor structure
     * @return		status code
     */
    static efi_status_t EFIAPI efi_get_memory_map_ext(
    					efi_uintn_t *memory_map_size,
    					struct efi_mem_desc *memory_map,
    					efi_uintn_t *map_key,
    					efi_uintn_t *descriptor_size,
    					uint32_t *descriptor_version)
    {
    	efi_status_t r;
    
    	EFI_ENTRY("%p, %p, %p, %p, %p", memory_map_size, memory_map,
    		  map_key, descriptor_size, descriptor_version);
    	r = efi_get_memory_map(memory_map_size, memory_map, map_key,
    			       descriptor_size, descriptor_version);
    	return EFI_EXIT(r);
    }
    
    /*
     * Allocate memory from pool.
     *
     * This function implements the AllocatePool service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @pool_type	type of the pool from which memory is to be allocated
     * @size	number of bytes to be allocated
     * @buffer	allocated memory
     * @return	status code
     */
    static efi_status_t EFIAPI efi_allocate_pool_ext(int pool_type,
    						 efi_uintn_t size,
    						 void **buffer)
    {
    	efi_status_t r;
    
    	EFI_ENTRY("%d, %zd, %p", pool_type, size, buffer);
    	r = efi_allocate_pool(pool_type, size, buffer);
    	return EFI_EXIT(r);
    }
    
    /*
     * Free memory from pool.
     *
     * This function implements the FreePool service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @buffer	start of memory to be freed
     * @return	status code
     */
    static efi_status_t EFIAPI efi_free_pool_ext(void *buffer)
    {
    	efi_status_t r;
    
    	EFI_ENTRY("%p", buffer);
    	r = efi_free_pool(buffer);
    	return EFI_EXIT(r);
    }
    
    /*
     * Add a new object to the object list.
     *
     * The protocols list is initialized.
     * The object handle is set.
     *
     * @obj	object to be added
     */
    void efi_add_handle(struct efi_object *obj)
    {
    	if (!obj)
    		return;
    	INIT_LIST_HEAD(&obj->protocols);
    	obj->handle = obj;
    	list_add_tail(&obj->link, &efi_obj_list);
    }
    
    /*
     * Create handle.
     *
     * @handle	new handle
     * @return	status code
     */
    efi_status_t efi_create_handle(void **handle)
    {
    	struct efi_object *obj;
    	efi_status_t r;
    
    	r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES,
    			      sizeof(struct efi_object),
    			      (void **)&obj);
    	if (r != EFI_SUCCESS)
    		return r;
    	efi_add_handle(obj);
    	*handle = obj->handle;
    	return r;
    }
    
    /*
     * Find a protocol on a handle.
     *
     * @handle		handle
     * @protocol_guid	GUID of the protocol
     * @handler		reference to the protocol
     * @return		status code
     */
    efi_status_t efi_search_protocol(const void *handle,
    				 const efi_guid_t *protocol_guid,
    				 struct efi_handler **handler)
    {
    	struct efi_object *efiobj;
    	struct list_head *lhandle;
    
    	if (!handle || !protocol_guid)
    		return EFI_INVALID_PARAMETER;
    	efiobj = efi_search_obj(handle);
    	if (!efiobj)
    		return EFI_INVALID_PARAMETER;
    	list_for_each(lhandle, &efiobj->protocols) {
    		struct efi_handler *protocol;
    
    		protocol = list_entry(lhandle, struct efi_handler, link);
    		if (!guidcmp(protocol->guid, protocol_guid)) {
    			if (handler)
    				*handler = protocol;
    			return EFI_SUCCESS;
    		}
    	}
    	return EFI_NOT_FOUND;
    }
    
    /*
     * Delete protocol from a handle.
     *
     * @handle			handle from which the protocol shall be deleted
     * @protocol			GUID of the protocol to be deleted
     * @protocol_interface		interface of the protocol implementation
     * @return			status code
     */
    efi_status_t efi_remove_protocol(const void *handle, const efi_guid_t *protocol,
    				 void *protocol_interface)
    {
    	struct efi_handler *handler;
    	efi_status_t ret;
    
    	ret = efi_search_protocol(handle, protocol, &handler);
    	if (ret != EFI_SUCCESS)
    		return ret;
    	if (guidcmp(handler->guid, protocol))
    		return EFI_INVALID_PARAMETER;
    	list_del(&handler->link);
    	free(handler);
    	return EFI_SUCCESS;
    }
    
    /*
     * Delete all protocols from a handle.
     *
     * @handle	handle from which the protocols shall be deleted
     * @return	status code
     */
    efi_status_t efi_remove_all_protocols(const void *handle)
    {
    	struct efi_object *efiobj;
    	struct efi_handler *protocol;
    	struct efi_handler *pos;
    
    	efiobj = efi_search_obj(handle);
    	if (!efiobj)
    		return EFI_INVALID_PARAMETER;
    	list_for_each_entry_safe(protocol, pos, &efiobj->protocols, link) {
    		efi_status_t ret;
    
    		ret = efi_remove_protocol(handle, protocol->guid,
    					  protocol->protocol_interface);
    		if (ret != EFI_SUCCESS)
    			return ret;
    	}
    	return EFI_SUCCESS;
    }
    
    /*
     * Delete handle.
     *
     * @handle	handle to delete
     */
    void efi_delete_handle(struct efi_object *obj)
    {
    	if (!obj)
    		return;
    	efi_remove_all_protocols(obj->handle);
    	list_del(&obj->link);
    	free(obj);
    }
    
    /*
     * Our event capabilities are very limited. Only a small limited
     * number of events is allowed to coexist.
     */
    static struct efi_event efi_events[16];
    
    /*
     * Create an event.
     *
     * This function is used inside U-Boot code to create an event.
     *
     * For the API function implementing the CreateEvent service see
     * efi_create_event_ext.
     *
     * @type		type of the event to create
     * @notify_tpl		task priority level of the event
     * @notify_function	notification function of the event
     * @notify_context	pointer passed to the notification function
     * @event		created event
     * @return		status code
     */
    efi_status_t efi_create_event(uint32_t type, efi_uintn_t notify_tpl,
    			      void (EFIAPI *notify_function) (
    					struct efi_event *event,
    					void *context),
    			      void *notify_context, struct efi_event **event)
    {
    	int i;
    
    	if (event == NULL)
    		return EFI_INVALID_PARAMETER;
    
    	if ((type & EVT_NOTIFY_SIGNAL) && (type & EVT_NOTIFY_WAIT))
    		return EFI_INVALID_PARAMETER;
    
    	if ((type & (EVT_NOTIFY_SIGNAL|EVT_NOTIFY_WAIT)) &&
    	    notify_function == NULL)
    		return EFI_INVALID_PARAMETER;
    
    	for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
    		if (efi_events[i].type)
    			continue;
    		efi_events[i].type = type;
    		efi_events[i].notify_tpl = notify_tpl;
    		efi_events[i].notify_function = notify_function;
    		efi_events[i].notify_context = notify_context;
    		/* Disable timers on bootup */
    		efi_events[i].trigger_next = -1ULL;
    		efi_events[i].is_queued = false;
    		efi_events[i].is_signaled = false;
    		*event = &efi_events[i];
    		return EFI_SUCCESS;
    	}
    	return EFI_OUT_OF_RESOURCES;
    }
    
    /*
     * Create an event.
     *
     * This function implements the CreateEvent service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @type		type of the event to create
     * @notify_tpl		task priority level of the event
     * @notify_function	notification function of the event
     * @notify_context	pointer passed to the notification function
     * @event		created event
     * @return		status code
     */
    static efi_status_t EFIAPI efi_create_event_ext(
    			uint32_t type, efi_uintn_t notify_tpl,
    			void (EFIAPI *notify_function) (
    					struct efi_event *event,
    					void *context),
    			void *notify_context, struct efi_event **event)
    {
    	EFI_ENTRY("%d, 0x%zx, %p, %p", type, notify_tpl, notify_function,
    		  notify_context);
    	return EFI_EXIT(efi_create_event(type, notify_tpl, notify_function,
    					 notify_context, event));
    }
    
    
    /*
     * Check if a timer event has occurred or a queued notification function should
     * be called.
     *
     * Our timers have to work without interrupts, so we check whenever keyboard
     * input or disk accesses happen if enough time elapsed for them to fire.
     */
    void efi_timer_check(void)
    {
    	int i;
    	u64 now = timer_get_us();
    
    	for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
    		if (!efi_events[i].type)
    			continue;
    		if (efi_events[i].is_queued)
    			efi_signal_event(&efi_events[i]);
    		if (!(efi_events[i].type & EVT_TIMER) ||
    		    now < efi_events[i].trigger_next)
    			continue;
    		switch (efi_events[i].trigger_type) {
    		case EFI_TIMER_RELATIVE:
    			efi_events[i].trigger_type = EFI_TIMER_STOP;
    			break;
    		case EFI_TIMER_PERIODIC:
    			efi_events[i].trigger_next +=
    				efi_events[i].trigger_time;
    			break;
    		default:
    			continue;
    		}
    		efi_events[i].is_signaled = true;
    		efi_signal_event(&efi_events[i]);
    	}
    	WATCHDOG_RESET();
    }
    
    /*
     * Set the trigger time for a timer event or stop the event.
     *
     * This is the function for internal usage in U-Boot. For the API function
     * implementing the SetTimer service see efi_set_timer_ext.
     *
     * @event		event for which the timer is set
     * @type		type of the timer
     * @trigger_time	trigger period in multiples of 100ns
     * @return		status code
     */
    efi_status_t efi_set_timer(struct efi_event *event, enum efi_timer_delay type,
    			   uint64_t trigger_time)
    {
    	int i;
    
    	/*
    	 * The parameter defines a multiple of 100ns.
    	 * We use multiples of 1000ns. So divide by 10.
    	 */
    	do_div(trigger_time, 10);
    
    	for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
    		if (event != &efi_events[i])
    			continue;
    
    		if (!(event->type & EVT_TIMER))
    			break;
    		switch (type) {
    		case EFI_TIMER_STOP:
    			event->trigger_next = -1ULL;
    			break;
    		case EFI_TIMER_PERIODIC:
    		case EFI_TIMER_RELATIVE:
    			event->trigger_next =
    				timer_get_us() + trigger_time;
    			break;
    		default:
    			return EFI_INVALID_PARAMETER;
    		}
    		event->trigger_type = type;
    		event->trigger_time = trigger_time;
    		event->is_signaled = false;
    		return EFI_SUCCESS;
    	}
    	return EFI_INVALID_PARAMETER;
    }
    
    /*
     * Set the trigger time for a timer event or stop the event.
     *
     * This function implements the SetTimer service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @event		event for which the timer is set
     * @type		type of the timer
     * @trigger_time	trigger period in multiples of 100ns
     * @return		status code
     */
    static efi_status_t EFIAPI efi_set_timer_ext(struct efi_event *event,
    					     enum efi_timer_delay type,
    					     uint64_t trigger_time)
    {
    	EFI_ENTRY("%p, %d, %"PRIx64, event, type, trigger_time);
    	return EFI_EXIT(efi_set_timer(event, type, trigger_time));
    }
    
    /*
     * Wait for events to be signaled.
     *
     * This function implements the WaitForEvent service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @num_events	number of events to be waited for
     * @events	events to be waited for
     * @index	index of the event that was signaled
     * @return	status code
     */
    static efi_status_t EFIAPI efi_wait_for_event(efi_uintn_t num_events,
    					      struct efi_event **event,
    					      efi_uintn_t *index)
    {
    	int i, j;
    
    	EFI_ENTRY("%zd, %p, %p", num_events, event, index);
    
    	/* Check parameters */
    	if (!num_events || !event)
    		return EFI_EXIT(EFI_INVALID_PARAMETER);
    	/* Check TPL */
    	if (efi_tpl != TPL_APPLICATION)
    		return EFI_EXIT(EFI_UNSUPPORTED);
    	for (i = 0; i < num_events; ++i) {
    		for (j = 0; j < ARRAY_SIZE(efi_events); ++j) {
    			if (event[i] == &efi_events[j])
    				goto known_event;
    		}
    		return EFI_EXIT(EFI_INVALID_PARAMETER);
    known_event:
    		if (!event[i]->type || event[i]->type & EVT_NOTIFY_SIGNAL)
    			return EFI_EXIT(EFI_INVALID_PARAMETER);
    		if (!event[i]->is_signaled)
    			efi_signal_event(event[i]);
    	}
    
    	/* Wait for signal */
    	for (;;) {
    		for (i = 0; i < num_events; ++i) {
    			if (event[i]->is_signaled)
    				goto out;
    		}
    		/* Allow events to occur. */
    		efi_timer_check();
    	}
    
    out:
    	/*
    	 * Reset the signal which is passed to the caller to allow periodic
    	 * events to occur.
    	 */
    	event[i]->is_signaled = false;
    	if (index)
    		*index = i;
    
    	return EFI_EXIT(EFI_SUCCESS);
    }
    
    /*
     * Signal an EFI event.
     *
     * This function implements the SignalEvent service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * This functions sets the signaled state of the event and queues the
     * notification function for execution.
     *
     * @event	event to signal
     * @return	status code
     */
    static efi_status_t EFIAPI efi_signal_event_ext(struct efi_event *event)
    {
    	int i;
    
    	EFI_ENTRY("%p", event);
    	for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
    		if (event != &efi_events[i])
    			continue;
    		if (event->is_signaled)
    			break;
    		event->is_signaled = true;
    		if (event->type & EVT_NOTIFY_SIGNAL)
    			efi_signal_event(event);
    		break;
    	}
    	return EFI_EXIT(EFI_SUCCESS);
    }
    
    /*
     * Close an EFI event.
     *
     * This function implements the CloseEvent service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @event	event to close
     * @return	status code
     */
    static efi_status_t EFIAPI efi_close_event(struct efi_event *event)
    {
    	int i;
    
    	EFI_ENTRY("%p", event);
    	for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
    		if (event == &efi_events[i]) {
    			event->type = 0;
    			event->trigger_next = -1ULL;
    			event->is_queued = false;
    			event->is_signaled = false;
    			return EFI_EXIT(EFI_SUCCESS);
    		}
    	}
    	return EFI_EXIT(EFI_INVALID_PARAMETER);
    }
    
    /*
     * Check if an event is signaled.
     *
     * This function implements the CheckEvent service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * If an event is not signaled yet the notification function is queued.
     *
     * @event	event to check
     * @return	status code
     */
    static efi_status_t EFIAPI efi_check_event(struct efi_event *event)
    {
    	int i;
    
    	EFI_ENTRY("%p", event);
    	efi_timer_check();
    	for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
    		if (event != &efi_events[i])
    			continue;
    		if (!event->type || event->type & EVT_NOTIFY_SIGNAL)
    			break;
    		if (!event->is_signaled)
    			efi_signal_event(event);
    		if (event->is_signaled)
    			return EFI_EXIT(EFI_SUCCESS);
    		return EFI_EXIT(EFI_NOT_READY);
    	}
    	return EFI_EXIT(EFI_INVALID_PARAMETER);
    }
    
    /*
     * Find the internal EFI object for a handle.
     *
     * @handle	handle to find
     * @return	EFI object
     */
    struct efi_object *efi_search_obj(const void *handle)
    {
    	struct efi_object *efiobj;
    
    	list_for_each_entry(efiobj, &efi_obj_list, link) {
    		if (efiobj->handle == handle)
    			return efiobj;
    	}
    
    	return NULL;
    }
    
    /*
     * Create open protocol info entry and add it to a protocol.
     *
     * @handler	handler of a protocol
     * @return	open protocol info entry
     */
    static struct efi_open_protocol_info_entry *efi_create_open_info(
    			struct efi_handler *handler)
    {
    	struct efi_open_protocol_info_item *item;
    
    	item = calloc(1, sizeof(struct efi_open_protocol_info_item));
    	if (!item)
    		return NULL;
    	/* Append the item to the open protocol info list. */
    	list_add_tail(&item->link, &handler->open_infos);
    
    	return &item->info;
    }
    
    /*
     * Remove an open protocol info entry from a protocol.
     *
     * @handler	handler of a protocol
     * @return	status code
     */
    static efi_status_t efi_delete_open_info(
    			struct efi_open_protocol_info_item *item)
    {
    	list_del(&item->link);
    	free(item);
    	return EFI_SUCCESS;
    }
    
    /*
     * Install new protocol on a handle.
     *
     * @handle			handle on which the protocol shall be installed
     * @protocol			GUID of the protocol to be installed
     * @protocol_interface		interface of the protocol implementation
     * @return			status code
     */
    efi_status_t efi_add_protocol(const void *handle, const efi_guid_t *protocol,
    			      void *protocol_interface)
    {
    	struct efi_object *efiobj;
    	struct efi_handler *handler;
    	efi_status_t ret;
    
    	efiobj = efi_search_obj(handle);
    	if (!efiobj)
    		return EFI_INVALID_PARAMETER;
    	ret = efi_search_protocol(handle, protocol, NULL);
    	if (ret != EFI_NOT_FOUND)
    		return EFI_INVALID_PARAMETER;
    	handler = calloc(1, sizeof(struct efi_handler));
    	if (!handler)
    		return EFI_OUT_OF_RESOURCES;
    	handler->guid = protocol;
    	handler->protocol_interface = protocol_interface;
    	INIT_LIST_HEAD(&handler->open_infos);
    	list_add_tail(&handler->link, &efiobj->protocols);
    	return EFI_SUCCESS;
    }
    
    /*
     * Install protocol interface.
     *
     * This function implements the InstallProtocolInterface service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @handle			handle on which the protocol shall be installed
     * @protocol			GUID of the protocol to be installed
     * @protocol_interface_type	type of the interface to be installed,
     *				always EFI_NATIVE_INTERFACE
     * @protocol_interface		interface of the protocol implementation
     * @return			status code
     */
    static efi_status_t EFIAPI efi_install_protocol_interface(
    			void **handle, const efi_guid_t *protocol,
    			int protocol_interface_type, void *protocol_interface)
    {
    	efi_status_t r;
    
    	EFI_ENTRY("%p, %pUl, %d, %p", handle, protocol, protocol_interface_type,
    		  protocol_interface);
    
    	if (!handle || !protocol ||
    	    protocol_interface_type != EFI_NATIVE_INTERFACE) {
    		r = EFI_INVALID_PARAMETER;
    		goto out;
    	}
    
    	/* Create new handle if requested. */
    	if (!*handle) {
    		r = efi_create_handle(handle);
    		if (r != EFI_SUCCESS)
    			goto out;
    		debug("%sEFI: new handle %p\n", indent_string(nesting_level),
    		      *handle);
    	} else {
    		debug("%sEFI: handle %p\n", indent_string(nesting_level),
    		      *handle);
    	}
    	/* Add new protocol */
    	r = efi_add_protocol(*handle, protocol, protocol_interface);
    out:
    	return EFI_EXIT(r);
    }
    
    /*
     * Reinstall protocol interface.
     *
     * This function implements the ReinstallProtocolInterface service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @handle			handle on which the protocol shall be
     *				reinstalled
     * @protocol			GUID of the protocol to be installed
     * @old_interface		interface to be removed
     * @new_interface		interface to be installed
     * @return			status code
     */
    static efi_status_t EFIAPI efi_reinstall_protocol_interface(void *handle,
    			const efi_guid_t *protocol, void *old_interface,
    			void *new_interface)
    {
    	EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, old_interface,
    		  new_interface);
    	return EFI_EXIT(EFI_ACCESS_DENIED);
    }
    
    /*
     * Uninstall protocol interface.
     *
     * This function implements the UninstallProtocolInterface service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @handle			handle from which the protocol shall be removed
     * @protocol			GUID of the protocol to be removed
     * @protocol_interface		interface to be removed
     * @return			status code
     */
    static efi_status_t EFIAPI efi_uninstall_protocol_interface(
    				void *handle, const efi_guid_t *protocol,
    				void *protocol_interface)
    {
    	struct efi_handler *handler;
    	efi_status_t r;
    
    	EFI_ENTRY("%p, %pUl, %p", handle, protocol, protocol_interface);
    
    	if (!handle || !protocol) {
    		r = EFI_INVALID_PARAMETER;
    		goto out;
    	}
    
    	/* Find the protocol on the handle */
    	r = efi_search_protocol(handle, protocol, &handler);
    	if (r != EFI_SUCCESS)
    		goto out;
    	if (handler->protocol_interface) {
    		/* TODO disconnect controllers */
    		r =  EFI_ACCESS_DENIED;
    	} else {
    		r = efi_remove_protocol(handle, protocol, protocol_interface);
    	}
    out:
    	return EFI_EXIT(r);
    }
    
    /*
     * Register an event for notification when a protocol is installed.
     *
     * This function implements the RegisterProtocolNotify service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @protocol		GUID of the protocol whose installation shall be
     *			notified
     * @event		event to be signaled upon installation of the protocol
     * @registration	key for retrieving the registration information
     * @return		status code
     */
    static efi_status_t EFIAPI efi_register_protocol_notify(
    						const efi_guid_t *protocol,
    						struct efi_event *event,
    						void **registration)
    {
    	EFI_ENTRY("%pUl, %p, %p", protocol, event, registration);
    	return EFI_EXIT(EFI_OUT_OF_RESOURCES);
    }
    
    /*
     * Determine if an EFI handle implements a protocol.
     *
     * See the documentation of the LocateHandle service in the UEFI specification.
     *
     * @search_type		selection criterion
     * @protocol		GUID of the protocol
     * @search_key		registration key
     * @efiobj		handle
     * @return		0 if the handle implements the protocol
     */
    static int efi_search(enum efi_locate_search_type search_type,
    		      const efi_guid_t *protocol, void *search_key,
    		      struct efi_object *efiobj)
    {
    	efi_status_t ret;
    
    	switch (search_type) {
    	case ALL_HANDLES:
    		return 0;
    	case BY_REGISTER_NOTIFY:
    		/* TODO: RegisterProtocolNotify is not implemented yet */
    		return -1;
    	case BY_PROTOCOL:
    		ret = efi_search_protocol(efiobj->handle, protocol, NULL);
    		return (ret != EFI_SUCCESS);
    	default:
    		/* Invalid search type */
    		return -1;
    	}
    }
    
    /*
     * Locate handles implementing a protocol.
     *
     * This function is meant for U-Boot internal calls. For the API implementation
     * of the LocateHandle service see efi_locate_handle_ext.
     *
     * @search_type		selection criterion
     * @protocol		GUID of the protocol
     * @search_key		registration key
     * @buffer_size		size of the buffer to receive the handles in bytes
     * @buffer		buffer to receive the relevant handles
     * @return		status code
     */
    static efi_status_t efi_locate_handle(
    			enum efi_locate_search_type search_type,
    			const efi_guid_t *protocol, void *search_key,
    			efi_uintn_t *buffer_size, efi_handle_t *buffer)
    {
    	struct efi_object *efiobj;
    	efi_uintn_t size = 0;
    
    	/* Check parameters */
    	switch (search_type) {
    	case ALL_HANDLES:
    		break;
    	case BY_REGISTER_NOTIFY:
    		if (!search_key)
    			return EFI_INVALID_PARAMETER;
    		/* RegisterProtocolNotify is not implemented yet */
    		return EFI_UNSUPPORTED;
    	case BY_PROTOCOL:
    		if (!protocol)
    			return EFI_INVALID_PARAMETER;
    		break;
    	default:
    		return EFI_INVALID_PARAMETER;
    	}
    
    	/*
    	 * efi_locate_handle_buffer uses this function for
    	 * the calculation of the necessary buffer size.
    	 * So do not require a buffer for buffersize == 0.
    	 */
    	if (!buffer_size || (*buffer_size && !buffer))
    		return EFI_INVALID_PARAMETER;
    
    	/* Count how much space we need */
    	list_for_each_entry(efiobj, &efi_obj_list, link) {
    		if (!efi_search(search_type, protocol, search_key, efiobj))
    			size += sizeof(void*);
    	}
    
    	if (*buffer_size < size) {
    		*buffer_size = size;
    		return EFI_BUFFER_TOO_SMALL;
    	}
    
    	*buffer_size = size;
    	if (size == 0)
    		return EFI_NOT_FOUND;
    
    	/* Then fill the array */
    	list_for_each_entry(efiobj, &efi_obj_list, link) {
    		if (!efi_search(search_type, protocol, search_key, efiobj))
    			*buffer++ = efiobj->handle;
    	}
    
    	return EFI_SUCCESS;
    }
    
    /*
     * Locate handles implementing a protocol.
     *
     * This function implements the LocateHandle service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @search_type		selection criterion
     * @protocol		GUID of the protocol
     * @search_key		registration key
     * @buffer_size		size of the buffer to receive the handles in bytes
     * @buffer		buffer to receive the relevant handles
     * @return		0 if the handle implements the protocol
     */
    static efi_status_t EFIAPI efi_locate_handle_ext(
    			enum efi_locate_search_type search_type,
    			const efi_guid_t *protocol, void *search_key,
    			efi_uintn_t *buffer_size, efi_handle_t *buffer)
    {
    	EFI_ENTRY("%d, %pUl, %p, %p, %p", search_type, protocol, search_key,
    		  buffer_size, buffer);
    
    	return EFI_EXIT(efi_locate_handle(search_type, protocol, search_key,
    			buffer_size, buffer));
    }
    
    /* Collapses configuration table entries, removing index i */
    static void efi_remove_configuration_table(int i)
    {
    	struct efi_configuration_table *this = &efi_conf_table[i];
    	struct efi_configuration_table *next = &efi_conf_table[i+1];
    	struct efi_configuration_table *end = &efi_conf_table[systab.nr_tables];
    
    	memmove(this, next, (ulong)end - (ulong)next);
    	systab.nr_tables--;
    }
    
    /*
     * Adds, updates, or removes a configuration table.
     *
     * This function is used for internal calls. For the API implementation of the
     * InstallConfigurationTable service see efi_install_configuration_table_ext.
     *
     * @guid		GUID of the installed table
     * @table		table to be installed
     * @return		status code
     */
    efi_status_t efi_install_configuration_table(const efi_guid_t *guid, void *table)
    {
    	int i;
    
    	/* Check for guid override */
    	for (i = 0; i < systab.nr_tables; i++) {
    		if (!guidcmp(guid, &efi_conf_table[i].guid)) {
    			if (table)
    				efi_conf_table[i].table = table;
    			else
    				efi_remove_configuration_table(i);
    			return EFI_SUCCESS;
    		}
    	}
    
    	if (!table)
    		return EFI_NOT_FOUND;
    
    	/* No override, check for overflow */
    	if (i >= ARRAY_SIZE(efi_conf_table))
    		return EFI_OUT_OF_RESOURCES;
    
    	/* Add a new entry */
    	memcpy(&efi_conf_table[i].guid, guid, sizeof(*guid));
    	efi_conf_table[i].table = table;
    	systab.nr_tables = i + 1;
    
    	return EFI_SUCCESS;
    }
    
    /*
     * Adds, updates, or removes a configuration table.
     *
     * This function implements the InstallConfigurationTable service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @guid		GUID of the installed table
     * @table		table to be installed
     * @return		status code
     */
    static efi_status_t EFIAPI efi_install_configuration_table_ext(efi_guid_t *guid,
    							       void *table)
    {
    	EFI_ENTRY("%pUl, %p", guid, table);
    	return EFI_EXIT(efi_install_configuration_table(guid, table));
    }
    
    /*
     * Initialize a loaded_image_info + loaded_image_info object with correct
     * protocols, boot-device, etc.
     *
     * @info		loaded image info to be passed to the entry point of the
     *			image
     * @obj			internal object associated with the loaded image
     * @device_path		device path of the loaded image
     * @file_path		file path of the loaded image
     * @return		status code
     */
    efi_status_t efi_setup_loaded_image(
    			struct efi_loaded_image *info, struct efi_object *obj,
    			struct efi_device_path *device_path,
    			struct efi_device_path *file_path)
    {
    	efi_status_t ret;
    
    	/* Add internal object to object list */
    	efi_add_handle(obj);
    	/* efi_exit() assumes that the handle points to the info */
    	obj->handle = info;
    
    	info->file_path = file_path;
    	if (device_path)
    		info->device_handle = efi_dp_find_obj(device_path, NULL);
    
    	/*
    	 * When asking for the device path interface, return
    	 * bootefi_device_path
    	 */
    	ret = efi_add_protocol(obj->handle, &efi_guid_device_path, device_path);
    	if (ret != EFI_SUCCESS)
    		goto failure;
    
    	/*
    	 * When asking for the loaded_image interface, just
    	 * return handle which points to loaded_image_info
    	 */
    	ret = efi_add_protocol(obj->handle, &efi_guid_loaded_image, info);
    	if (ret != EFI_SUCCESS)
    		goto failure;
    
    	ret = efi_add_protocol(obj->handle, &efi_guid_console_control,
    			       (void *)&efi_console_control);
    	if (ret != EFI_SUCCESS)
    		goto failure;
    
    	ret = efi_add_protocol(obj->handle,
    			       &efi_guid_device_path_to_text_protocol,
    			       (void *)&efi_device_path_to_text);
    	if (ret != EFI_SUCCESS)
    		goto failure;
    
    	return ret;
    failure:
    	printf("ERROR: Failure to install protocols for loaded image\n");
    	return ret;
    }
    
    /*
     * Load an image using a file path.
     *
     * @file_path		the path of the image to load
     * @buffer		buffer containing the loaded image
     * @return		status code
     */
    efi_status_t efi_load_image_from_path(struct efi_device_path *file_path,
    				      void **buffer)
    {
    	struct efi_file_info *info = NULL;
    	struct efi_file_handle *f;
    	static efi_status_t ret;
    	uint64_t bs;
    
    	f = efi_file_from_path(file_path);
    	if (!f)
    		return EFI_DEVICE_ERROR;
    
    	bs = 0;
    	EFI_CALL(ret = f->getinfo(f, (efi_guid_t *)&efi_file_info_guid,
    				  &bs, info));
    	if (ret == EFI_BUFFER_TOO_SMALL) {
    		info = malloc(bs);
    		EFI_CALL(ret = f->getinfo(f, (efi_guid_t *)&efi_file_info_guid,
    					  &bs, info));
    	}
    	if (ret != EFI_SUCCESS)
    		goto error;
    
    	ret = efi_allocate_pool(EFI_LOADER_DATA, info->file_size, buffer);
    	if (ret)
    		goto error;
    
    	EFI_CALL(ret = f->read(f, &info->file_size, *buffer));
    
    error:
    	free(info);
    	EFI_CALL(f->close(f));
    
    	if (ret != EFI_SUCCESS) {
    		efi_free_pool(*buffer);
    		*buffer = NULL;
    	}
    
    	return ret;
    }
    
    /*
     * Load an EFI image into memory.
     *
     * This function implements the LoadImage service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @boot_policy		true for request originating from the boot manager
     * @parent_image	the calles's image handle
     * @file_path		the path of the image to load
     * @source_buffer	memory location from which the image is installed
     * @source_size		size of the memory area from which the image is
     *			installed
     * @image_handle	handle for the newly installed image
     * @return		status code
     */
    static efi_status_t EFIAPI efi_load_image(bool boot_policy,
    					  efi_handle_t parent_image,
    					  struct efi_device_path *file_path,
    					  void *source_buffer,
    					  unsigned long source_size,
    					  efi_handle_t *image_handle)
    {
    	struct efi_loaded_image *info;
    	struct efi_object *obj;
    	efi_status_t ret;
    
    	EFI_ENTRY("%d, %p, %p, %p, %ld, %p", boot_policy, parent_image,
    		  file_path, source_buffer, source_size, image_handle);
    
    	info = calloc(1, sizeof(*info));
    	obj = calloc(1, sizeof(*obj));
    
    	if (!source_buffer) {
    		struct efi_device_path *dp, *fp;
    
    		ret = efi_load_image_from_path(file_path, &source_buffer);
    		if (ret != EFI_SUCCESS)
    			goto failure;
    		/*
    		 * split file_path which contains both the device and
    		 * file parts:
    		 */
    		efi_dp_split_file_path(file_path, &dp, &fp);
    		ret = efi_setup_loaded_image(info, obj, dp, fp);
    		if (ret != EFI_SUCCESS)
    			goto failure;
    	} else {
    		/* In this case, file_path is the "device" path, ie.
    		 * something like a HARDWARE_DEVICE:MEMORY_MAPPED
    		 */
    		ret = efi_setup_loaded_image(info, obj, file_path, NULL);
    		if (ret != EFI_SUCCESS)
    			goto failure;
    	}
    	info->reserved = efi_load_pe(source_buffer, info);
    	if (!info->reserved) {
    		ret = EFI_UNSUPPORTED;
    		goto failure;
    	}
    	info->system_table = &systab;
    	info->parent_handle = parent_image;
    	*image_handle = obj->handle;
    	return EFI_EXIT(EFI_SUCCESS);
    failure:
    	free(info);
    	efi_delete_handle(obj);
    	return EFI_EXIT(ret);
    }
    
    /*
     * Call the entry point of an image.
     *
     * This function implements the StartImage service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @image_handle	handle of the image
     * @exit_data_size	size of the buffer
     * @exit_data		buffer to receive the exit data of the called image
     * @return		status code
     */
    static efi_status_t EFIAPI efi_start_image(efi_handle_t image_handle,
    					   unsigned long *exit_data_size,
    					   s16 **exit_data)
    {
    	ulong (*entry)(void *image_handle, struct efi_system_table *st);
    	struct efi_loaded_image *info = image_handle;
    	efi_status_t ret;
    
    	EFI_ENTRY("%p, %p, %p", image_handle, exit_data_size, exit_data);
    	entry = info->reserved;
    
    	efi_is_direct_boot = false;
    
    	/* call the image! */
    	if (setjmp(&info->exit_jmp)) {
    		/*
    		 * We called the entry point of the child image with EFI_CALL
    		 * in the lines below. The child image called the Exit() boot
    		 * service efi_exit() which executed the long jump that brought
    		 * us to the current line. This implies that the second half
    		 * of the EFI_CALL macro has not been executed.
    		 */
    #ifdef CONFIG_ARM
    		/*
    		 * efi_exit() called efi_restore_gd(). We have to undo this
    		 * otherwise __efi_entry_check() will put the wrong value into
    		 * app_gd.
    		 */
    		gd = app_gd;
    #endif
    		/*
    		 * To get ready to call EFI_EXIT below we have to execute the
    		 * missed out steps of EFI_CALL.
    		 */
    		assert(__efi_entry_check());
    		debug("%sEFI: %lu returned by started image\n",
    		      __efi_nesting_dec(),
    		      (unsigned long)((uintptr_t)info->exit_status &
    				      ~EFI_ERROR_MASK));
    		return EFI_EXIT(info->exit_status);
    	}
    
    	ret = EFI_CALL(entry(image_handle, &systab));
    
    	/* Should usually never get here */
    	return EFI_EXIT(ret);
    }
    
    /*
     * Leave an EFI application or driver.
     *
     * This function implements the Exit service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @image_handle	handle of the application or driver that is exiting
     * @exit_status		status code
     * @exit_data_size	size of the buffer in bytes
     * @exit_data		buffer with data describing an error
     * @return		status code
     */
    static efi_status_t EFIAPI efi_exit(efi_handle_t image_handle,
    			efi_status_t exit_status, unsigned long exit_data_size,
    			int16_t *exit_data)
    {
    	/*
    	 * We require that the handle points to the original loaded
    	 * image protocol interface.
    	 *
    	 * For getting the longjmp address this is safer than locating
    	 * the protocol because the protocol may have been reinstalled
    	 * pointing to another memory location.
    	 *
    	 * TODO: We should call the unload procedure of the loaded
    	 *	 image protocol.
    	 */
    	struct efi_loaded_image *loaded_image_info = (void*)image_handle;
    
    	EFI_ENTRY("%p, %ld, %ld, %p", image_handle, exit_status,
    		  exit_data_size, exit_data);
    
    	/* Make sure entry/exit counts for EFI world cross-overs match */
    	EFI_EXIT(exit_status);
    
    	/*
    	 * But longjmp out with the U-Boot gd, not the application's, as
    	 * the other end is a setjmp call inside EFI context.
    	 */
    	efi_restore_gd();
    
    	loaded_image_info->exit_status = exit_status;
    	longjmp(&loaded_image_info->exit_jmp, 1);
    
    	panic("EFI application exited");
    }
    
    /*
     * Unload an EFI image.
     *
     * This function implements the UnloadImage service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @image_handle	handle of the image to be unloaded
     * @return		status code
     */
    static efi_status_t EFIAPI efi_unload_image(void *image_handle)
    {
    	struct efi_object *efiobj;
    
    	EFI_ENTRY("%p", image_handle);
    	efiobj = efi_search_obj(image_handle);
    	if (efiobj)
    		list_del(&efiobj->link);
    
    	return EFI_EXIT(EFI_SUCCESS);
    }
    
    /*
     * Fix up caches for EFI payloads if necessary.
     */
    static void efi_exit_caches(void)
    {
    #if defined(CONFIG_ARM) && !defined(CONFIG_ARM64)
    	/*
    	 * Grub on 32bit ARM needs to have caches disabled before jumping into
    	 * a zImage, but does not know of all cache layers. Give it a hand.
    	 */
    	if (efi_is_direct_boot)
    		cleanup_before_linux();
    #endif
    }
    
    /*
     * Stop boot services.
     *
     * This function implements the ExitBootServices service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @image_handle	handle of the loaded image
     * @map_key		key of the memory map
     * @return		status code
     */
    static efi_status_t EFIAPI efi_exit_boot_services(void *image_handle,
    						  unsigned long map_key)
    {
    	int i;
    
    	EFI_ENTRY("%p, %ld", image_handle, map_key);
    
    	/* Notify that ExitBootServices is invoked. */
    	for (i = 0; i < ARRAY_SIZE(efi_events); ++i) {
    		if (efi_events[i].type != EVT_SIGNAL_EXIT_BOOT_SERVICES)
    			continue;
    		efi_signal_event(&efi_events[i]);
    	}
    	/* Make sure that notification functions are not called anymore */
    	efi_tpl = TPL_HIGH_LEVEL;
    
    	/* XXX Should persist EFI variables here */
    
    	board_quiesce_devices();
    
    	/* Fix up caches for EFI payloads if necessary */
    	efi_exit_caches();
    
    	/* This stops all lingering devices */
    	bootm_disable_interrupts();
    
    	/* Give the payload some time to boot */
    	efi_set_watchdog(0);
    	WATCHDOG_RESET();
    
    	return EFI_EXIT(EFI_SUCCESS);
    }
    
    /*
     * Get next value of the counter.
     *
     * This function implements the NextMonotonicCount service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @count	returned value of the counter
     * @return	status code
     */
    static efi_status_t EFIAPI efi_get_next_monotonic_count(uint64_t *count)
    {
    	static uint64_t mono = 0;
    	EFI_ENTRY("%p", count);
    	*count = mono++;
    	return EFI_EXIT(EFI_SUCCESS);
    }
    
    /*
     * Sleep.
     *
     * This function implements the Stall sercive.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @microseconds	period to sleep in microseconds
     * @return		status code
     */
    static efi_status_t EFIAPI efi_stall(unsigned long microseconds)
    {
    	EFI_ENTRY("%ld", microseconds);
    	udelay(microseconds);
    	return EFI_EXIT(EFI_SUCCESS);
    }
    
    /*
     * Reset the watchdog timer.
     *
     * This function implements the SetWatchdogTimer service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @timeout		seconds before reset by watchdog
     * @watchdog_code	code to be logged when resetting
     * @data_size		size of buffer in bytes
     * @watchdog_data	buffer with data describing the reset reason
     * @return		status code
     */
    static efi_status_t EFIAPI efi_set_watchdog_timer(unsigned long timeout,
    						  uint64_t watchdog_code,
    						  unsigned long data_size,
    						  uint16_t *watchdog_data)
    {
    	EFI_ENTRY("%ld, 0x%"PRIx64", %ld, %p", timeout, watchdog_code,
    		  data_size, watchdog_data);
    	return EFI_EXIT(efi_set_watchdog(timeout));
    }
    
    /*
     * Connect a controller to a driver.
     *
     * This function implements the ConnectController service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @controller_handle	handle of the controller
     * @driver_image_handle	handle of the driver
     * @remain_device_path	device path of a child controller
     * @recursive		true to connect all child controllers
     * @return		status code
     */
    static efi_status_t EFIAPI efi_connect_controller(
    			efi_handle_t controller_handle,
    			efi_handle_t *driver_image_handle,
    			struct efi_device_path *remain_device_path,
    			bool recursive)
    {
    	EFI_ENTRY("%p, %p, %p, %d", controller_handle, driver_image_handle,
    		  remain_device_path, recursive);
    	return EFI_EXIT(EFI_NOT_FOUND);
    }
    
    /*
     * Disconnect a controller from a driver.
     *
     * This function implements the DisconnectController service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @controller_handle	handle of the controller
     * @driver_image_handle handle of the driver
     * @child_handle	handle of the child to destroy
     * @return		status code
     */
    static efi_status_t EFIAPI efi_disconnect_controller(void *controller_handle,
    						     void *driver_image_handle,
    						     void *child_handle)
    {
    	EFI_ENTRY("%p, %p, %p", controller_handle, driver_image_handle,
    		  child_handle);
    	return EFI_EXIT(EFI_INVALID_PARAMETER);
    }
    
    /*
     * Close a protocol.
     *
     * This function implements the CloseProtocol service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @handle		handle on which the protocol shall be closed
     * @protocol		GUID of the protocol to close
     * @agent_handle	handle of the driver
     * @controller_handle	handle of the controller
     * @return		status code
     */
    static efi_status_t EFIAPI efi_close_protocol(void *handle,
    					      const efi_guid_t *protocol,
    					      void *agent_handle,
    					      void *controller_handle)
    {
    	EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, agent_handle,
    		  controller_handle);
    	return EFI_EXIT(EFI_NOT_FOUND);
    }
    
    /*
     * Provide information about then open status of a protocol on a handle
     *
     * This function implements the OpenProtocolInformation service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @handle		handle for which the information shall be retrieved
     * @protocol		GUID of the protocol
     * @entry_buffer	buffer to receive the open protocol information
     * @entry_count		number of entries available in the buffer
     * @return		status code
     */
    static efi_status_t EFIAPI efi_open_protocol_information(efi_handle_t handle,
    			const efi_guid_t *protocol,
    			struct efi_open_protocol_info_entry **entry_buffer,
    			efi_uintn_t *entry_count)
    {
    	EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, entry_buffer,
    		  entry_count);
    	return EFI_EXIT(EFI_NOT_FOUND);
    }
    
    /*
     * Get protocols installed on a handle.
     *
     * This function implements the ProtocolsPerHandleService.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @handle			handle for which the information is retrieved
     * @protocol_buffer		buffer with protocol GUIDs
     * @protocol_buffer_count	number of entries in the buffer
     * @return			status code
     */
    static efi_status_t EFIAPI efi_protocols_per_handle(void *handle,
    			efi_guid_t ***protocol_buffer,
    			efi_uintn_t *protocol_buffer_count)
    {
    	unsigned long buffer_size;
    	struct efi_object *efiobj;
    	struct list_head *protocol_handle;
    	efi_status_t r;
    
    	EFI_ENTRY("%p, %p, %p", handle, protocol_buffer,
    		  protocol_buffer_count);
    
    	if (!handle || !protocol_buffer || !protocol_buffer_count)
    		return EFI_EXIT(EFI_INVALID_PARAMETER);
    
    	*protocol_buffer = NULL;
    	*protocol_buffer_count = 0;
    
    	efiobj = efi_search_obj(handle);
    	if (!efiobj)
    		return EFI_EXIT(EFI_INVALID_PARAMETER);
    
    	/* Count protocols */
    	list_for_each(protocol_handle, &efiobj->protocols) {
    		++*protocol_buffer_count;
    	}
    
    	/* Copy guids */
    	if (*protocol_buffer_count) {
    		size_t j = 0;
    
    		buffer_size = sizeof(efi_guid_t *) * *protocol_buffer_count;
    		r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, buffer_size,
    				      (void **)protocol_buffer);
    		if (r != EFI_SUCCESS)
    			return EFI_EXIT(r);
    		list_for_each(protocol_handle, &efiobj->protocols) {
    			struct efi_handler *protocol;
    
    			protocol = list_entry(protocol_handle,
    					      struct efi_handler, link);
    			(*protocol_buffer)[j] = (void *)protocol->guid;
    			++j;
    		}
    	}
    
    	return EFI_EXIT(EFI_SUCCESS);
    }
    
    /*
     * Locate handles implementing a protocol.
     *
     * This function implements the LocateHandleBuffer service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @search_type		selection criterion
     * @protocol		GUID of the protocol
     * @search_key		registration key
     * @no_handles		number of returned handles
     * @buffer		buffer with the returned handles
     * @return		status code
     */
    static efi_status_t EFIAPI efi_locate_handle_buffer(
    			enum efi_locate_search_type search_type,
    			const efi_guid_t *protocol, void *search_key,
    			efi_uintn_t *no_handles, efi_handle_t **buffer)
    {
    	efi_status_t r;
    	efi_uintn_t buffer_size = 0;
    
    	EFI_ENTRY("%d, %pUl, %p, %p, %p", search_type, protocol, search_key,
    		  no_handles, buffer);
    
    	if (!no_handles || !buffer) {
    		r = EFI_INVALID_PARAMETER;
    		goto out;
    	}
    	*no_handles = 0;
    	*buffer = NULL;
    	r = efi_locate_handle(search_type, protocol, search_key, &buffer_size,
    			      *buffer);
    	if (r != EFI_BUFFER_TOO_SMALL)
    		goto out;
    	r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, buffer_size,
    			      (void **)buffer);
    	if (r != EFI_SUCCESS)
    		goto out;
    	r = efi_locate_handle(search_type, protocol, search_key, &buffer_size,
    			      *buffer);
    	if (r == EFI_SUCCESS)
    		*no_handles = buffer_size / sizeof(void *);
    out:
    	return EFI_EXIT(r);
    }
    
    /*
     * Find an interface implementing a protocol.
     *
     * This function implements the LocateProtocol service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @protocol		GUID of the protocol
     * @registration	registration key passed to the notification function
     * @protocol_interface	interface implementing the protocol
     * @return		status code
     */
    static efi_status_t EFIAPI efi_locate_protocol(const efi_guid_t *protocol,
    					       void *registration,
    					       void **protocol_interface)
    {
    	struct list_head *lhandle;
    	efi_status_t ret;
    
    	EFI_ENTRY("%pUl, %p, %p", protocol, registration, protocol_interface);
    
    	if (!protocol || !protocol_interface)
    		return EFI_EXIT(EFI_INVALID_PARAMETER);
    
    	list_for_each(lhandle, &efi_obj_list) {
    		struct efi_object *efiobj;
    		struct efi_handler *handler;
    
    		efiobj = list_entry(lhandle, struct efi_object, link);
    
    		ret = efi_search_protocol(efiobj->handle, protocol, &handler);
    		if (ret == EFI_SUCCESS) {
    			*protocol_interface = handler->protocol_interface;
    			return EFI_EXIT(EFI_SUCCESS);
    		}
    	}
    	*protocol_interface = NULL;
    
    	return EFI_EXIT(EFI_NOT_FOUND);
    }
    
    /*
     * Get the device path and handle of an device implementing a protocol.
     *
     * This function implements the LocateDevicePath service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @protocol		GUID of the protocol
     * @device_path		device path
     * @device		handle of the device
     * @return		status code
     */
    static efi_status_t EFIAPI efi_locate_device_path(
    			const efi_guid_t *protocol,
    			struct efi_device_path **device_path,
    			efi_handle_t *device)
    {
    	struct efi_device_path *dp;
    	size_t i;
    	struct efi_handler *handler;
    	efi_handle_t *handles;
    	size_t len, len_dp;
    	size_t len_best = 0;
    	efi_uintn_t no_handles;
    	u8 *remainder;
    	efi_status_t ret;
    
    	EFI_ENTRY("%pUl, %p, %p", protocol, device_path, device);
    
    	if (!protocol || !device_path || !*device_path || !device) {
    		ret = EFI_INVALID_PARAMETER;
    		goto out;
    	}
    
    	/* Find end of device path */
    	len = efi_dp_size(*device_path);
    
    	/* Get all handles implementing the protocol */
    	ret = EFI_CALL(efi_locate_handle_buffer(BY_PROTOCOL, protocol, NULL,
    						&no_handles, &handles));
    	if (ret != EFI_SUCCESS)
    		goto out;
    
    	for (i = 0; i < no_handles; ++i) {
    		/* Find the device path protocol */
    		ret = efi_search_protocol(handles[i], &efi_guid_device_path,
    					  &handler);
    		if (ret != EFI_SUCCESS)
    			continue;
    		dp = (struct efi_device_path *)handler->protocol_interface;
    		len_dp = efi_dp_size(dp);
    		/*
    		 * This handle can only be a better fit
    		 * if its device path length is longer than the best fit and
    		 * if its device path length is shorter of equal the searched
    		 * device path.
    		 */
    		if (len_dp <= len_best || len_dp > len)
    			continue;
    		/* Check if dp is a subpath of device_path */
    		if (memcmp(*device_path, dp, len_dp))
    			continue;
    		*device = handles[i];
    		len_best = len_dp;
    	}
    	if (len_best) {
    		remainder = (u8 *)*device_path + len_best;
    		*device_path = (struct efi_device_path *)remainder;
    		ret = EFI_SUCCESS;
    	} else {
    		ret = EFI_NOT_FOUND;
    	}
    out:
    	return EFI_EXIT(ret);
    }
    
    /*
     * Install multiple protocol interfaces.
     *
     * This function implements the MultipleProtocolInterfaces service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @handle	handle on which the protocol interfaces shall be installed
     * @...		NULL terminated argument list with pairs of protocol GUIDS and
     *		interfaces
     * @return	status code
     */
    static efi_status_t EFIAPI efi_install_multiple_protocol_interfaces(
    			void **handle, ...)
    {
    	EFI_ENTRY("%p", handle);
    
    	va_list argptr;
    	const efi_guid_t *protocol;
    	void *protocol_interface;
    	efi_status_t r = EFI_SUCCESS;
    	int i = 0;
    
    	if (!handle)
    		return EFI_EXIT(EFI_INVALID_PARAMETER);
    
    	va_start(argptr, handle);
    	for (;;) {
    		protocol = va_arg(argptr, efi_guid_t*);
    		if (!protocol)
    			break;
    		protocol_interface = va_arg(argptr, void*);
    		r = EFI_CALL(efi_install_protocol_interface(
    						handle, protocol,
    						EFI_NATIVE_INTERFACE,
    						protocol_interface));
    		if (r != EFI_SUCCESS)
    			break;
    		i++;
    	}
    	va_end(argptr);
    	if (r == EFI_SUCCESS)
    		return EFI_EXIT(r);
    
    	/* If an error occurred undo all changes. */
    	va_start(argptr, handle);
    	for (; i; --i) {
    		protocol = va_arg(argptr, efi_guid_t*);
    		protocol_interface = va_arg(argptr, void*);
    		EFI_CALL(efi_uninstall_protocol_interface(handle, protocol,
    							  protocol_interface));
    	}
    	va_end(argptr);
    
    	return EFI_EXIT(r);
    }
    
    /*
     * Uninstall multiple protocol interfaces.
     *
     * This function implements the UninstallMultipleProtocolInterfaces service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @handle	handle from which the protocol interfaces shall be removed
     * @...		NULL terminated argument list with pairs of protocol GUIDS and
     *		interfaces
     * @return	status code
     */
    static efi_status_t EFIAPI efi_uninstall_multiple_protocol_interfaces(
    			void *handle, ...)
    {
    	EFI_ENTRY("%p", handle);
    
    	va_list argptr;
    	const efi_guid_t *protocol;
    	void *protocol_interface;
    	efi_status_t r = EFI_SUCCESS;
    	size_t i = 0;
    
    	if (!handle)
    		return EFI_EXIT(EFI_INVALID_PARAMETER);
    
    	va_start(argptr, handle);
    	for (;;) {
    		protocol = va_arg(argptr, efi_guid_t*);
    		if (!protocol)
    			break;
    		protocol_interface = va_arg(argptr, void*);
    		r = EFI_CALL(efi_uninstall_protocol_interface(
    						handle, protocol,
    						protocol_interface));
    		if (r != EFI_SUCCESS)
    			break;
    		i++;
    	}
    	va_end(argptr);
    	if (r == EFI_SUCCESS)
    		return EFI_EXIT(r);
    
    	/* If an error occurred undo all changes. */
    	va_start(argptr, handle);
    	for (; i; --i) {
    		protocol = va_arg(argptr, efi_guid_t*);
    		protocol_interface = va_arg(argptr, void*);
    		EFI_CALL(efi_install_protocol_interface(&handle, protocol,
    							EFI_NATIVE_INTERFACE,
    							protocol_interface));
    	}
    	va_end(argptr);
    
    	return EFI_EXIT(r);
    }
    
    /*
     * Calculate cyclic redundancy code.
     *
     * This function implements the CalculateCrc32 service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @data	buffer with data
     * @data_size	size of buffer in bytes
     * @crc32_p	cyclic redundancy code
     * @return	status code
     */
    static efi_status_t EFIAPI efi_calculate_crc32(void *data,
    					       unsigned long data_size,
    					       uint32_t *crc32_p)
    {
    	EFI_ENTRY("%p, %ld", data, data_size);
    	*crc32_p = crc32(0, data, data_size);
    	return EFI_EXIT(EFI_SUCCESS);
    }
    
    /*
     * Copy memory.
     *
     * This function implements the CopyMem service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @destination		destination of the copy operation
     * @source		source of the copy operation
     * @length		number of bytes to copy
     */
    static void EFIAPI efi_copy_mem(void *destination, const void *source,
    				size_t length)
    {
    	EFI_ENTRY("%p, %p, %ld", destination, source, (unsigned long)length);
    	memcpy(destination, source, length);
    	EFI_EXIT(EFI_SUCCESS);
    }
    
    /*
     * Fill memory with a byte value.
     *
     * This function implements the SetMem service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @buffer		buffer to fill
     * @size		size of buffer in bytes
     * @value		byte to copy to the buffer
     */
    static void EFIAPI efi_set_mem(void *buffer, size_t size, uint8_t value)
    {
    	EFI_ENTRY("%p, %ld, 0x%x", buffer, (unsigned long)size, value);
    	memset(buffer, value, size);
    	EFI_EXIT(EFI_SUCCESS);
    }
    
    /*
     * Open protocol interface on a handle.
     *
     * @handler		handler of a protocol
     * @protocol_interface	interface implementing the protocol
     * @agent_handle	handle of the driver
     * @controller_handle	handle of the controller
     * @attributes		attributes indicating how to open the protocol
     * @return		status code
     */
    static efi_status_t efi_protocol_open(
    			struct efi_handler *handler,
    			void **protocol_interface, void *agent_handle,
    			void *controller_handle, uint32_t attributes)
    {
    	struct efi_open_protocol_info_item *item;
    	struct efi_open_protocol_info_entry *match = NULL;
    	bool opened_by_driver = false;
    	bool opened_exclusive = false;
    
    	/* If there is no agent, only return the interface */
    	if (!agent_handle)
    		goto out;
    
    	/* For TEST_PROTOCOL ignore interface attribute */
    	if (attributes != EFI_OPEN_PROTOCOL_TEST_PROTOCOL)
    		*protocol_interface = NULL;
    
    	/*
    	 * Check if the protocol is already opened by a driver with the same
    	 * attributes or opened exclusively
    	 */
    	list_for_each_entry(item, &handler->open_infos, link) {
    		if (item->info.agent_handle == agent_handle) {
    			if ((attributes & EFI_OPEN_PROTOCOL_BY_DRIVER) &&
    			    (item->info.attributes == attributes))
    				return EFI_ALREADY_STARTED;
    		}
    		if (item->info.attributes & EFI_OPEN_PROTOCOL_EXCLUSIVE)
    			opened_exclusive = true;
    	}
    
    	/* Only one controller can open the protocol exclusively */
    	if (opened_exclusive && attributes &
    	    (EFI_OPEN_PROTOCOL_EXCLUSIVE | EFI_OPEN_PROTOCOL_BY_DRIVER))
    		return EFI_ACCESS_DENIED;
    
    	/* Prepare exclusive opening */
    	if (attributes & EFI_OPEN_PROTOCOL_EXCLUSIVE) {
    		/* Try to disconnect controllers */
    		list_for_each_entry(item, &handler->open_infos, link) {
    			if (item->info.attributes ==
    					EFI_OPEN_PROTOCOL_BY_DRIVER)
    				EFI_CALL(efi_disconnect_controller(
    						item->info.controller_handle,
    						item->info.agent_handle,
    						NULL));
    		}
    		opened_by_driver = false;
    		/* Check if all controllers are disconnected */
    		list_for_each_entry(item, &handler->open_infos, link) {
    			if (item->info.attributes & EFI_OPEN_PROTOCOL_BY_DRIVER)
    				opened_by_driver = true;
    		}
    		/* Only one controller can be conncected */
    		if (opened_by_driver)
    			return EFI_ACCESS_DENIED;
    	}
    
    	/* Find existing entry */
    	list_for_each_entry(item, &handler->open_infos, link) {
    		if (item->info.agent_handle == agent_handle &&
    		    item->info.controller_handle == controller_handle)
    			match = &item->info;
    	}
    	/* None found, create one */
    	if (!match) {
    		match = efi_create_open_info(handler);
    		if (!match)
    			return EFI_OUT_OF_RESOURCES;
    	}
    
    	match->agent_handle = agent_handle;
    	match->controller_handle = controller_handle;
    	match->attributes = attributes;
    	match->open_count++;
    
    out:
    	/* For TEST_PROTOCOL ignore interface attribute. */
    	if (attributes != EFI_OPEN_PROTOCOL_TEST_PROTOCOL)
    		*protocol_interface = handler->protocol_interface;
    
    	return EFI_SUCCESS;
    }
    
    /*
     * Open protocol interface on a handle.
     *
     * This function implements the OpenProtocol interface.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @handle		handle on which the protocol shall be opened
     * @protocol		GUID of the protocol
     * @protocol_interface	interface implementing the protocol
     * @agent_handle	handle of the driver
     * @controller_handle	handle of the controller
     * @attributes		attributes indicating how to open the protocol
     * @return		status code
     */
    static efi_status_t EFIAPI efi_open_protocol(
    			void *handle, const efi_guid_t *protocol,
    			void **protocol_interface, void *agent_handle,
    			void *controller_handle, uint32_t attributes)
    {
    	struct efi_handler *handler;
    	efi_status_t r = EFI_INVALID_PARAMETER;
    
    	EFI_ENTRY("%p, %pUl, %p, %p, %p, 0x%x", handle, protocol,
    		  protocol_interface, agent_handle, controller_handle,
    		  attributes);
    
    	if (!handle || !protocol ||
    	    (!protocol_interface && attributes !=
    	     EFI_OPEN_PROTOCOL_TEST_PROTOCOL)) {
    		goto out;
    	}
    
    	switch (attributes) {
    	case EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL:
    	case EFI_OPEN_PROTOCOL_GET_PROTOCOL:
    	case EFI_OPEN_PROTOCOL_TEST_PROTOCOL:
    		break;
    	case EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER:
    		if (controller_handle == handle)
    			goto out;
    		/* fall-through */
    	case EFI_OPEN_PROTOCOL_BY_DRIVER:
    	case EFI_OPEN_PROTOCOL_BY_DRIVER | EFI_OPEN_PROTOCOL_EXCLUSIVE:
    		/* Check that the controller handle is valid */
    		if (!efi_search_obj(controller_handle))
    			goto out;
    		/* fall-through */
    	case EFI_OPEN_PROTOCOL_EXCLUSIVE:
    		/* Check that the agent handle is valid */
    		if (!efi_search_obj(agent_handle))
    			goto out;
    		break;
    	default:
    		goto out;
    	}
    
    	r = efi_search_protocol(handle, protocol, &handler);
    	if (r != EFI_SUCCESS)
    		goto out;
    
    	r = efi_protocol_open(handler, protocol_interface, agent_handle,
    			      controller_handle, attributes);
    out:
    	return EFI_EXIT(r);
    }
    
    /*
     * Get interface of a protocol on a handle.
     *
     * This function implements the HandleProtocol service.
     * See the Unified Extensible Firmware Interface (UEFI) specification
     * for details.
     *
     * @handle		handle on which the protocol shall be opened
     * @protocol		GUID of the protocol
     * @protocol_interface  interface implementing the protocol
     * @return		status code
     */
    static efi_status_t EFIAPI efi_handle_protocol(void *handle,
    					       const efi_guid_t *protocol,
    					       void **protocol_interface)
    {
    	return efi_open_protocol(handle, protocol, protocol_interface, NULL,
    				 NULL, EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL);
    }
    
    static const struct efi_boot_services efi_boot_services = {
    	.hdr = {
    		.headersize = sizeof(struct efi_table_hdr),
    	},
    	.raise_tpl = efi_raise_tpl,
    	.restore_tpl = efi_restore_tpl,
    	.allocate_pages = efi_allocate_pages_ext,
    	.free_pages = efi_free_pages_ext,
    	.get_memory_map = efi_get_memory_map_ext,
    	.allocate_pool = efi_allocate_pool_ext,
    	.free_pool = efi_free_pool_ext,
    	.create_event = efi_create_event_ext,
    	.set_timer = efi_set_timer_ext,
    	.wait_for_event = efi_wait_for_event,
    	.signal_event = efi_signal_event_ext,
    	.close_event = efi_close_event,
    	.check_event = efi_check_event,
    	.install_protocol_interface = efi_install_protocol_interface,
    	.reinstall_protocol_interface = efi_reinstall_protocol_interface,
    	.uninstall_protocol_interface = efi_uninstall_protocol_interface,
    	.handle_protocol = efi_handle_protocol,
    	.reserved = NULL,
    	.register_protocol_notify = efi_register_protocol_notify,
    	.locate_handle = efi_locate_handle_ext,
    	.locate_device_path = efi_locate_device_path,
    	.install_configuration_table = efi_install_configuration_table_ext,
    	.load_image = efi_load_image,
    	.start_image = efi_start_image,
    	.exit = efi_exit,
    	.unload_image = efi_unload_image,
    	.exit_boot_services = efi_exit_boot_services,
    	.get_next_monotonic_count = efi_get_next_monotonic_count,
    	.stall = efi_stall,
    	.set_watchdog_timer = efi_set_watchdog_timer,
    	.connect_controller = efi_connect_controller,
    	.disconnect_controller = efi_disconnect_controller,
    	.open_protocol = efi_open_protocol,
    	.close_protocol = efi_close_protocol,
    	.open_protocol_information = efi_open_protocol_information,
    	.protocols_per_handle = efi_protocols_per_handle,
    	.locate_handle_buffer = efi_locate_handle_buffer,
    	.locate_protocol = efi_locate_protocol,
    	.install_multiple_protocol_interfaces = efi_install_multiple_protocol_interfaces,
    	.uninstall_multiple_protocol_interfaces = efi_uninstall_multiple_protocol_interfaces,
    	.calculate_crc32 = efi_calculate_crc32,
    	.copy_mem = efi_copy_mem,
    	.set_mem = efi_set_mem,
    };
    
    
    static uint16_t __efi_runtime_data firmware_vendor[] = L"Das U-Boot";
    
    struct efi_system_table __efi_runtime_data systab = {
    	.hdr = {
    		.signature = EFI_SYSTEM_TABLE_SIGNATURE,
    		.revision = 0x20005, /* 2.5 */
    		.headersize = sizeof(struct efi_table_hdr),
    	},
    	.fw_vendor = (long)firmware_vendor,
    	.con_in = (void*)&efi_con_in,
    	.con_out = (void*)&efi_con_out,
    	.std_err = (void*)&efi_con_out,
    	.runtime = (void*)&efi_runtime_services,
    	.boottime = (void*)&efi_boot_services,
    	.nr_tables = 0,
    	.tables = (void*)efi_conf_table,
    };