lib/efi_loader/efi_runtime.c - platform/external/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  *  EFI application runtime services
  *
  *  Copyright (c) 2016 Alexander Graf
  */

 #include <common.h>
 #include <command.h>
 #include <dm.h>
 #include <elf.h>
 #include <efi_loader.h>
 #include <rtc.h>

 /* For manual relocation support */
 DECLARE_GLOBAL_DATA_PTR;

 struct efi_runtime_mmio_list {
 	struct list_head link;
 	void **ptr;
 	u64 paddr;
 	u64 len;
 };

 /* This list contains all runtime available mmio regions */
 LIST_HEAD(efi_runtime_mmio);

 static efi_status_t __efi_runtime EFIAPI efi_unimplemented(void);
 static efi_status_t __efi_runtime EFIAPI efi_device_error(void);
 static efi_status_t __efi_runtime EFIAPI efi_invalid_parameter(void);

 /*
  * TODO(sjg@chromium.org): These defines and structures should come from the ELF
  * header for each architecture (or a generic header) rather than being repeated
  * here.
  */
 #if defined(__aarch64__)
 #define R_RELATIVE	R_AARCH64_RELATIVE
 #define R_MASK		0xffffffffULL
 #define IS_RELA		1
 #elif defined(__arm__)
 #define R_RELATIVE	R_ARM_RELATIVE
 #define R_MASK		0xffULL
 #elif defined(__x86_64__) || defined(__i386__)
 #define R_RELATIVE	R_386_RELATIVE
 #define R_MASK		0xffULL
 #elif defined(__riscv)
 #define R_RELATIVE	R_RISCV_RELATIVE
 #define R_MASK		0xffULL
 #define IS_RELA		1

 struct dyn_sym {
 	ulong foo1;
 	ulong addr;
 	u32 foo2;
 	u32 foo3;
 };
 #if (__riscv_xlen == 32)
 #define R_ABSOLUTE	R_RISCV_32
 #define SYM_INDEX	8
 #elif (__riscv_xlen == 64)
 #define R_ABSOLUTE	R_RISCV_64
 #define SYM_INDEX	32
 #else
 #error unknown riscv target
 #endif
 #else
 #error Need to add relocation awareness
 #endif

 struct elf_rel {
 	ulong *offset;
 	ulong info;
 };

 struct elf_rela {
 	ulong *offset;
 	ulong info;
 	long addend;
 };

 /*
  * EFI runtime code lives in two stages. In the first stage, U-Boot and an EFI
  * payload are running concurrently at the same time. In this mode, we can
  * handle a good number of runtime callbacks
  */

 /**
  * efi_update_table_header_crc32() - Update crc32 in table header
  *
  * @table:	EFI table
  */
 void __efi_runtime efi_update_table_header_crc32(struct efi_table_hdr *table)
 {
 	table->crc32 = 0;
 	table->crc32 = crc32(0, (const unsigned char *)table,
 			     table->headersize);
 }

 /**
  * efi_reset_system_boottime() - reset system at boot time
  *
  * This function implements the ResetSystem() runtime service before
  * SetVirtualAddressMap() is called.
  *
  * See the Unified Extensible Firmware Interface (UEFI) specification for
  * details.
  *
  * @reset_type:		type of reset to perform
  * @reset_status:	status code for the reset
  * @data_size:		size of reset_data
  * @reset_data:		information about the reset
  */
 static void EFIAPI efi_reset_system_boottime(
 			enum efi_reset_type reset_type,
 			efi_status_t reset_status,
 			unsigned long data_size, void *reset_data)
 {
 	struct efi_event *evt;

 	EFI_ENTRY("%d %lx %lx %p", reset_type, reset_status, data_size,
 		  reset_data);

 	/* Notify reset */
 	list_for_each_entry(evt, &efi_events, link) {
 		if (evt->group &&
 		    !guidcmp(evt->group,
 			     &efi_guid_event_group_reset_system)) {
 			efi_signal_event(evt, false);
 			break;
 		}
 	}
 	switch (reset_type) {
 	case EFI_RESET_COLD:
 	case EFI_RESET_WARM:
 	case EFI_RESET_PLATFORM_SPECIFIC:
 		do_reset(NULL, 0, 0, NULL);
 		break;
 	case EFI_RESET_SHUTDOWN:
 		/* We don't have anything to map this to */
 		break;
 	}

 	while (1) { }
 }

 /**
  * efi_get_time_boottime() - get current time at boot time
  *
  * This function implements the GetTime runtime service before
  * SetVirtualAddressMap() is called.
  *
  * See the Unified Extensible Firmware Interface (UEFI) specification
  * for details.
  *
  * @time:		pointer to structure to receive current time
  * @capabilities:	pointer to structure to receive RTC properties
  * Returns:		status code
  */
 static efi_status_t EFIAPI efi_get_time_boottime(
 			struct efi_time *time,
 			struct efi_time_cap *capabilities)
 {
 #ifdef CONFIG_DM_RTC
 	efi_status_t ret = EFI_SUCCESS;
 	int r;
 	struct rtc_time tm;
 	struct udevice *dev;

 	EFI_ENTRY("%p %p", time, capabilities);

 	if (!time) {
 		ret = EFI_INVALID_PARAMETER;
 		goto out;
 	}

 	r = uclass_get_device(UCLASS_RTC, 0, &dev);
 	if (!r)
 		r = dm_rtc_get(dev, &tm);
 	if (r) {
 		ret = EFI_DEVICE_ERROR;
 		goto out;
 	}

 	memset(time, 0, sizeof(*time));
 	time->year = tm.tm_year;
 	time->month = tm.tm_mon;
 	time->day = tm.tm_mday;
 	time->hour = tm.tm_hour;
 	time->minute = tm.tm_min;
 	time->second = tm.tm_sec;
 	time->daylight = EFI_TIME_ADJUST_DAYLIGHT;
 	if (tm.tm_isdst > 0)
 		time->daylight |= EFI_TIME_IN_DAYLIGHT;
 	time->timezone = EFI_UNSPECIFIED_TIMEZONE;

 	if (capabilities) {
 		/* Set reasonable dummy values */
 		capabilities->resolution = 1;		/* 1 Hz */
 		capabilities->accuracy = 100000000;	/* 100 ppm */
 		capabilities->sets_to_zero = false;
 	}
 out:
 	return EFI_EXIT(ret);
 #else
 	EFI_ENTRY("%p %p", time, capabilities);
 	return EFI_EXIT(EFI_DEVICE_ERROR);
 #endif
 }


 /**
  * efi_reset_system() - reset system
  *
  * This function implements the ResetSystem() runtime service after
  * SetVirtualAddressMap() is called. It only executes an endless loop.
  * Boards may override the helpers below to implement reset functionality.
  *
  * See the Unified Extensible Firmware Interface (UEFI) specification for
  * details.
  *
  * @reset_type:		type of reset to perform
  * @reset_status:	status code for the reset
  * @data_size:		size of reset_data
  * @reset_data:		information about the reset
  */
 void __weak __efi_runtime EFIAPI efi_reset_system(
 			enum efi_reset_type reset_type,
 			efi_status_t reset_status,
 			unsigned long data_size, void *reset_data)
 {
 	/* Nothing we can do */
 	while (1) { }
 }

 /**
  * efi_reset_system_init() - initialize the reset driver
  *
  * Boards may override this function to initialize the reset driver.
  */
 efi_status_t __weak efi_reset_system_init(void)
 {
 	return EFI_SUCCESS;
 }

 /**
  * efi_get_time() - get current time
  *
  * This function implements the GetTime runtime service after
  * SetVirtualAddressMap() is called. As the U-Boot driver are not available
  * anymore only an error code is returned.
  *
  * See the Unified Extensible Firmware Interface (UEFI) specification
  * for details.
  *
  * @time:		pointer to structure to receive current time
  * @capabilities:	pointer to structure to receive RTC properties
  * Returns:		status code
  */
 efi_status_t __weak __efi_runtime EFIAPI efi_get_time(
 			struct efi_time *time,
 			struct efi_time_cap *capabilities)
 {
 	/* Nothing we can do */
 	return EFI_DEVICE_ERROR;
 }

 struct efi_runtime_detach_list_struct {
 	void *ptr;
 	void *patchto;
 };

 static const struct efi_runtime_detach_list_struct efi_runtime_detach_list[] = {
 	{
 		/* do_reset is gone */
 		.ptr = &efi_runtime_services.reset_system,
 		.patchto = efi_reset_system,
 	}, {
 		/* invalidate_*cache_all are gone */
 		.ptr = &efi_runtime_services.set_virtual_address_map,
 		.patchto = &efi_invalid_parameter,
 	}, {
 		/* RTC accessors are gone */
 		.ptr = &efi_runtime_services.get_time,
 		.patchto = &efi_get_time,
 	}, {
 		/* Clean up system table */
 		.ptr = &systab.con_in,
 		.patchto = NULL,
 	}, {
 		/* Clean up system table */
 		.ptr = &systab.con_out,
 		.patchto = NULL,
 	}, {
 		/* Clean up system table */
 		.ptr = &systab.std_err,
 		.patchto = NULL,
 	}, {
 		/* Clean up system table */
 		.ptr = &systab.boottime,
 		.patchto = NULL,
 	}, {
 		.ptr = &efi_runtime_services.get_variable,
 		.patchto = &efi_device_error,
 	}, {
 		.ptr = &efi_runtime_services.get_next_variable_name,
 		.patchto = &efi_device_error,
 	}, {
 		.ptr = &efi_runtime_services.set_variable,
 		.patchto = &efi_device_error,
 	}
 };

 static bool efi_runtime_tobedetached(void *p)
 {
 	int i;

 	for (i = 0; i < ARRAY_SIZE(efi_runtime_detach_list); i++)
 		if (efi_runtime_detach_list[i].ptr == p)
 			return true;

 	return false;
 }

 static void efi_runtime_detach(ulong offset)
 {
 	int i;
 	ulong patchoff = offset - (ulong)gd->relocaddr;

 	for (i = 0; i < ARRAY_SIZE(efi_runtime_detach_list); i++) {
 		ulong patchto = (ulong)efi_runtime_detach_list[i].patchto;
 		ulong *p = efi_runtime_detach_list[i].ptr;
 		ulong newaddr = patchto ? (patchto + patchoff) : 0;

 		debug("%s: Setting %p to %lx\n", __func__, p, newaddr);
 		*p = newaddr;
 	}

 	/* Update CRC32 */
 	efi_update_table_header_crc32(&efi_runtime_services.hdr);
 }

 /* Relocate EFI runtime to uboot_reloc_base = offset */
 void efi_runtime_relocate(ulong offset, struct efi_mem_desc *map)
 {
 #ifdef IS_RELA
 	struct elf_rela *rel = (void*)&__efi_runtime_rel_start;
 #else
 	struct elf_rel *rel = (void*)&__efi_runtime_rel_start;
 	static ulong lastoff = CONFIG_SYS_TEXT_BASE;
 #endif

 	debug("%s: Relocating to offset=%lx\n", __func__, offset);
 	for (; (ulong)rel < (ulong)&__efi_runtime_rel_stop; rel++) {
 		ulong base = CONFIG_SYS_TEXT_BASE;
 		ulong *p;
 		ulong newaddr;

 		p = (void*)((ulong)rel->offset - base) + gd->relocaddr;

 		debug("%s: rel->info=%#lx *p=%#lx rel->offset=%p\n", __func__, rel->info, *p, rel->offset);

 		switch (rel->info & R_MASK) {
 		case R_RELATIVE:
 #ifdef IS_RELA
 		newaddr = rel->addend + offset - CONFIG_SYS_TEXT_BASE;
 #else
 		newaddr = *p - lastoff + offset;
 #endif
 			break;
 #ifdef R_ABSOLUTE
 		case R_ABSOLUTE: {
 			ulong symidx = rel->info >> SYM_INDEX;
 			extern struct dyn_sym __dyn_sym_start[];
 			newaddr = __dyn_sym_start[symidx].addr + offset;
 			break;
 		}
 #endif
 		default:
 			continue;
 		}

 		/* Check if the relocation is inside bounds */
 		if (map && ((newaddr < map->virtual_start) ||
 		    newaddr > (map->virtual_start +
 			      (map->num_pages << EFI_PAGE_SHIFT)))) {
 			if (!efi_runtime_tobedetached(p))
 				printf("U-Boot EFI: Relocation at %p is out of "
 				       "range (%lx)\n", p, newaddr);
 			continue;
 		}

 		debug("%s: Setting %p to %lx\n", __func__, p, newaddr);
 		*p = newaddr;
 		flush_dcache_range((ulong)p & ~(EFI_CACHELINE_SIZE - 1),
 			ALIGN((ulong)&p[1], EFI_CACHELINE_SIZE));
 	}

 #ifndef IS_RELA
 	lastoff = offset;
 #endif

         invalidate_icache_all();
 }

 /**
  * efi_set_virtual_address_map() - change from physical to virtual mapping
  *
  * This function implements the SetVirtualAddressMap() runtime service.
  *
  * See the Unified Extensible Firmware Interface (UEFI) specification for
  * details.
  *
  * @memory_map_size:	size of the virtual map
  * @descriptor_size:	size of an entry in the map
  * @descriptor_version:	version of the map entries
  * @virtmap:		virtual address mapping information
  * Return:		status code
  */
 static efi_status_t EFIAPI efi_set_virtual_address_map(
 			unsigned long memory_map_size,
 			unsigned long descriptor_size,
 			uint32_t descriptor_version,
 			struct efi_mem_desc *virtmap)
 {
 	ulong runtime_start = (ulong)&__efi_runtime_start &
 			      ~(ulong)EFI_PAGE_MASK;
 	int n = memory_map_size / descriptor_size;
 	int i;

 	EFI_ENTRY("%lx %lx %x %p", memory_map_size, descriptor_size,
 		  descriptor_version, virtmap);

 	/* Rebind mmio pointers */
 	for (i = 0; i < n; i++) {
 		struct efi_mem_desc *map = (void*)virtmap +
 					   (descriptor_size * i);
 		struct list_head *lhandle;
 		efi_physical_addr_t map_start = map->physical_start;
 		efi_physical_addr_t map_len = map->num_pages << EFI_PAGE_SHIFT;
 		efi_physical_addr_t map_end = map_start + map_len;
 		u64 off = map->virtual_start - map_start;

 		/* Adjust all mmio pointers in this region */
 		list_for_each(lhandle, &efi_runtime_mmio) {
 			struct efi_runtime_mmio_list *lmmio;

 			lmmio = list_entry(lhandle,
 					   struct efi_runtime_mmio_list,
 					   link);
 			if ((map_start <= lmmio->paddr) &&
 			    (map_end >= lmmio->paddr)) {
 				uintptr_t new_addr = lmmio->paddr + off;
 				*lmmio->ptr = (void *)new_addr;
 			}
 		}
 		if ((map_start <= (uintptr_t)systab.tables) &&
 		    (map_end >= (uintptr_t)systab.tables)) {
 			char *ptr = (char *)systab.tables;

 			ptr += off;
 			systab.tables = (struct efi_configuration_table *)ptr;
 		}
 	}

 	/* Move the actual runtime code over */
 	for (i = 0; i < n; i++) {
 		struct efi_mem_desc *map;

 		map = (void*)virtmap + (descriptor_size * i);
 		if (map->type == EFI_RUNTIME_SERVICES_CODE) {
 			ulong new_offset = map->virtual_start -
 					   (runtime_start - gd->relocaddr);

 			efi_runtime_relocate(new_offset, map);
 			/* Once we're virtual, we can no longer handle
 			   complex callbacks */
 			efi_runtime_detach(new_offset);
 			return EFI_EXIT(EFI_SUCCESS);
 		}
 	}

 	return EFI_EXIT(EFI_INVALID_PARAMETER);
 }

 /**
  * efi_add_runtime_mmio() - add memory-mapped IO region
  *
  * This function adds a memory-mapped IO region to the memory map to make it
  * available at runtime.
  *
  * @mmio_ptr:		address of the memory-mapped IO region
  * @len:		size of the memory-mapped IO region
  * Returns:		status code
  */
 efi_status_t efi_add_runtime_mmio(void *mmio_ptr, u64 len)
 {
 	struct efi_runtime_mmio_list *newmmio;
 	u64 pages = (len + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT;
 	uint64_t addr = *(uintptr_t *)mmio_ptr;
 	uint64_t retaddr;

 	retaddr = efi_add_memory_map(addr, pages, EFI_MMAP_IO, false);
 	if (retaddr != addr)
 		return EFI_OUT_OF_RESOURCES;

 	newmmio = calloc(1, sizeof(*newmmio));
 	if (!newmmio)
 		return EFI_OUT_OF_RESOURCES;
 	newmmio->ptr = mmio_ptr;
 	newmmio->paddr = *(uintptr_t *)mmio_ptr;
 	newmmio->len = len;
 	list_add_tail(&newmmio->link, &efi_runtime_mmio);

 	return EFI_SUCCESS;
 }

 /*
  * In the second stage, U-Boot has disappeared. To isolate our runtime code
  * that at this point still exists from the rest, we put it into a special
  * section.
  *
  *        !!WARNING!!
  *
  * This means that we can not rely on any code outside of this file in any
  * function or variable below this line.
  *
  * Please keep everything fully self-contained and annotated with
  * __efi_runtime and __efi_runtime_data markers.
  */

 /*
  * Relocate the EFI runtime stub to a different place. We need to call this
  * the first time we expose the runtime interface to a user and on set virtual
  * address map calls.
  */

 /**
  * efi_unimplemented() - replacement function, returns EFI_UNSUPPORTED
  *
  * This function is used after SetVirtualAddressMap() is called as replacement
  * for services that are not available anymore due to constraints of the U-Boot
  * implementation.
  *
  * Return:	EFI_UNSUPPORTED
  */
 static efi_status_t __efi_runtime EFIAPI efi_unimplemented(void)
 {
 	return EFI_UNSUPPORTED;
 }

 /**
  * efi_device_error() - replacement function, returns EFI_DEVICE_ERROR
  *
  * This function is used after SetVirtualAddressMap() is called as replacement
  * for services that are not available anymore due to constraints of the U-Boot
  * implementation.
  *
  * Return:	EFI_DEVICE_ERROR
  */
 static efi_status_t __efi_runtime EFIAPI efi_device_error(void)
 {
 	return EFI_DEVICE_ERROR;
 }

 /**
  * efi_invalid_parameter() - replacement function, returns EFI_INVALID_PARAMETER
  *
  * This function is used after SetVirtualAddressMap() is called as replacement
  * for services that are not available anymore due to constraints of the U-Boot
  * implementation.
  *
  * Return:	EFI_INVALID_PARAMETER
  */
 static efi_status_t __efi_runtime EFIAPI efi_invalid_parameter(void)
 {
 	return EFI_INVALID_PARAMETER;
 }

 /**
  * efi_update_capsule() - process information from operating system
  *
  * This function implements the UpdateCapsule() runtime service.
  *
  * See the Unified Extensible Firmware Interface (UEFI) specification for
  * details.
  *
  * @capsule_header_array:	pointer to array of virtual pointers
  * @capsule_count:		number of pointers in capsule_header_array
  * @scatter_gather_list:	pointer to arry of physical pointers
  * Returns:			status code
  */
 efi_status_t __efi_runtime EFIAPI efi_update_capsule(
 			struct efi_capsule_header **capsule_header_array,
 			efi_uintn_t capsule_count,
 			u64 scatter_gather_list)
 {
 	return EFI_UNSUPPORTED;
 }

 /**
  * efi_query_capsule_caps() - check if capsule is supported
  *
  * This function implements the QueryCapsuleCapabilities() runtime service.
  *
  * See the Unified Extensible Firmware Interface (UEFI) specification for
  * details.
  *
  * @capsule_header_array:	pointer to array of virtual pointers
  * @capsule_count:		number of pointers in capsule_header_array
  * @maximum_capsule_size:	maximum capsule size
  * @reset_type:			type of reset needed for capsule update
  * Returns:			status code
  */
 efi_status_t __efi_runtime EFIAPI efi_query_capsule_caps(
 			struct efi_capsule_header **capsule_header_array,
 			efi_uintn_t capsule_count,
 			u64 maximum_capsule_size,
 			u32 reset_type)
 {
 	return EFI_UNSUPPORTED;
 }

 /**
  * efi_query_variable_info() - get information about EFI variables
  *
  * This function implements the QueryVariableInfo() runtime service.
  *
  * See the Unified Extensible Firmware Interface (UEFI) specification for
  * details.
  *
  * @attributes:				bitmask to select variables to be
  *					queried
  * @maximum_variable_storage_size:	maximum size of storage area for the
  *					selected variable types
  * @remaining_variable_storage_size:	remaining size of storage are for the
  *					selected variable types
  * @maximum_variable_size:		maximum size of a variable of the
  *					selected type
  * Returns:				status code
  */
 efi_status_t __efi_runtime EFIAPI efi_query_variable_info(
 			u32 attributes,
 			u64 *maximum_variable_storage_size,
 			u64 *remaining_variable_storage_size,
 			u64 *maximum_variable_size)
 {
 	return EFI_UNSUPPORTED;
 }

 struct efi_runtime_services __efi_runtime_data efi_runtime_services = {
 	.hdr = {
 		.signature = EFI_RUNTIME_SERVICES_SIGNATURE,
 		.revision = EFI_SPECIFICATION_VERSION,
 		.headersize = sizeof(struct efi_runtime_services),
 	},
 	.get_time = &efi_get_time_boottime,
 	.set_time = (void *)&efi_device_error,
 	.get_wakeup_time = (void *)&efi_unimplemented,
 	.set_wakeup_time = (void *)&efi_unimplemented,
 	.set_virtual_address_map = &efi_set_virtual_address_map,
 	.convert_pointer = (void *)&efi_invalid_parameter,
 	.get_variable = efi_get_variable,
 	.get_next_variable_name = efi_get_next_variable_name,
 	.set_variable = efi_set_variable,
 	.get_next_high_mono_count = (void *)&efi_device_error,
 	.reset_system = &efi_reset_system_boottime,
 	.update_capsule = efi_update_capsule,
 	.query_capsule_caps = efi_query_capsule_caps,
 	.query_variable_info = efi_query_variable_info,
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* EFI application runtime services
	*
	* Copyright (c) 2016 Alexander Graf
	*/

	#include <common.h>
	#include <command.h>
	#include <dm.h>
	#include <elf.h>
	#include <efi_loader.h>
	#include <rtc.h>

	/* For manual relocation support */
	DECLARE_GLOBAL_DATA_PTR;

	struct efi_runtime_mmio_list {
	struct list_head link;
	void **ptr;
	u64 paddr;
	u64 len;
	};

	/* This list contains all runtime available mmio regions */
	LIST_HEAD(efi_runtime_mmio);

	static efi_status_t __efi_runtime EFIAPI efi_unimplemented(void);
	static efi_status_t __efi_runtime EFIAPI efi_device_error(void);
	static efi_status_t __efi_runtime EFIAPI efi_invalid_parameter(void);

	/*
	* TODO(sjg@chromium.org): These defines and structures should come from the ELF
	* header for each architecture (or a generic header) rather than being repeated
	* here.
	*/
	#if defined(__aarch64__)
	#define R_RELATIVE R_AARCH64_RELATIVE
	#define R_MASK 0xffffffffULL
	#define IS_RELA 1
	#elif defined(__arm__)
	#define R_RELATIVE R_ARM_RELATIVE
	#define R_MASK 0xffULL
	#elif defined(__x86_64__) \|\| defined(__i386__)
	#define R_RELATIVE R_386_RELATIVE
	#define R_MASK 0xffULL
	#elif defined(__riscv)
	#define R_RELATIVE R_RISCV_RELATIVE
	#define R_MASK 0xffULL
	#define IS_RELA 1

	struct dyn_sym {
	ulong foo1;
	ulong addr;
	u32 foo2;
	u32 foo3;
	};
	#if (__riscv_xlen == 32)
	#define R_ABSOLUTE R_RISCV_32
	#define SYM_INDEX 8
	#elif (__riscv_xlen == 64)
	#define R_ABSOLUTE R_RISCV_64
	#define SYM_INDEX 32
	#else
	#error unknown riscv target
	#endif
	#else
	#error Need to add relocation awareness
	#endif

	struct elf_rel {
	ulong *offset;
	ulong info;
	};

	struct elf_rela {
	ulong *offset;
	ulong info;
	long addend;
	};

	/*
	* EFI runtime code lives in two stages. In the first stage, U-Boot and an EFI
	* payload are running concurrently at the same time. In this mode, we can
	* handle a good number of runtime callbacks
	*/

	/**
	* efi_update_table_header_crc32() - Update crc32 in table header
	*
	* @table: EFI table
	*/
	void __efi_runtime efi_update_table_header_crc32(struct efi_table_hdr *table)
	{
	table->crc32 = 0;
	table->crc32 = crc32(0, (const unsigned char *)table,
	table->headersize);
	}

	/**
	* efi_reset_system_boottime() - reset system at boot time
	*
	* This function implements the ResetSystem() runtime service before
	* SetVirtualAddressMap() is called.
	*
	* See the Unified Extensible Firmware Interface (UEFI) specification for
	* details.
	*
	* @reset_type: type of reset to perform
	* @reset_status: status code for the reset
	* @data_size: size of reset_data
	* @reset_data: information about the reset
	*/
	static void EFIAPI efi_reset_system_boottime(
	enum efi_reset_type reset_type,
	efi_status_t reset_status,
	unsigned long data_size, void *reset_data)
	{
	struct efi_event *evt;

	EFI_ENTRY("%d %lx %lx %p", reset_type, reset_status, data_size,
	reset_data);

	/* Notify reset */
	list_for_each_entry(evt, &efi_events, link) {
	if (evt->group &&
	!guidcmp(evt->group,
	&efi_guid_event_group_reset_system)) {
	efi_signal_event(evt, false);
	break;
	}
	}
	switch (reset_type) {
	case EFI_RESET_COLD:
	case EFI_RESET_WARM:
	case EFI_RESET_PLATFORM_SPECIFIC:
	do_reset(NULL, 0, 0, NULL);
	break;
	case EFI_RESET_SHUTDOWN:
	/* We don't have anything to map this to */
	break;
	}

	while (1) { }
	}

	/**
	* efi_get_time_boottime() - get current time at boot time
	*
	* This function implements the GetTime runtime service before
	* SetVirtualAddressMap() is called.
	*
	* See the Unified Extensible Firmware Interface (UEFI) specification
	* for details.
	*
	* @time: pointer to structure to receive current time
	* @capabilities: pointer to structure to receive RTC properties
	* Returns: status code
	*/
	static efi_status_t EFIAPI efi_get_time_boottime(
	struct efi_time *time,
	struct efi_time_cap *capabilities)
	{
	#ifdef CONFIG_DM_RTC
	efi_status_t ret = EFI_SUCCESS;
	int r;
	struct rtc_time tm;
	struct udevice *dev;

	EFI_ENTRY("%p %p", time, capabilities);

	if (!time) {
	ret = EFI_INVALID_PARAMETER;
	goto out;
	}

	r = uclass_get_device(UCLASS_RTC, 0, &dev);
	if (!r)
	r = dm_rtc_get(dev, &tm);
	if (r) {
	ret = EFI_DEVICE_ERROR;
	goto out;
	}

	memset(time, 0, sizeof(*time));
	time->year = tm.tm_year;
	time->month = tm.tm_mon;
	time->day = tm.tm_mday;
	time->hour = tm.tm_hour;
	time->minute = tm.tm_min;
	time->second = tm.tm_sec;
	time->daylight = EFI_TIME_ADJUST_DAYLIGHT;
	if (tm.tm_isdst > 0)
	time->daylight \|= EFI_TIME_IN_DAYLIGHT;
	time->timezone = EFI_UNSPECIFIED_TIMEZONE;

	if (capabilities) {
	/* Set reasonable dummy values */
	capabilities->resolution = 1; /* 1 Hz */
	capabilities->accuracy = 100000000; /* 100 ppm */
	capabilities->sets_to_zero = false;
	}
	out:
	return EFI_EXIT(ret);
	#else
	EFI_ENTRY("%p %p", time, capabilities);
	return EFI_EXIT(EFI_DEVICE_ERROR);
	#endif
	}


	/**
	* efi_reset_system() - reset system
	*
	* This function implements the ResetSystem() runtime service after
	* SetVirtualAddressMap() is called. It only executes an endless loop.
	* Boards may override the helpers below to implement reset functionality.
	*
	* See the Unified Extensible Firmware Interface (UEFI) specification for
	* details.
	*
	* @reset_type: type of reset to perform
	* @reset_status: status code for the reset
	* @data_size: size of reset_data
	* @reset_data: information about the reset
	*/
	void __weak __efi_runtime EFIAPI efi_reset_system(
	enum efi_reset_type reset_type,
	efi_status_t reset_status,
	unsigned long data_size, void *reset_data)
	{
	/* Nothing we can do */
	while (1) { }
	}

	/**
	* efi_reset_system_init() - initialize the reset driver
	*
	* Boards may override this function to initialize the reset driver.
	*/
	efi_status_t __weak efi_reset_system_init(void)
	{
	return EFI_SUCCESS;
	}

	/**
	* efi_get_time() - get current time
	*
	* This function implements the GetTime runtime service after
	* SetVirtualAddressMap() is called. As the U-Boot driver are not available
	* anymore only an error code is returned.
	*
	* See the Unified Extensible Firmware Interface (UEFI) specification
	* for details.
	*
	* @time: pointer to structure to receive current time
	* @capabilities: pointer to structure to receive RTC properties
	* Returns: status code
	*/
	efi_status_t __weak __efi_runtime EFIAPI efi_get_time(
	struct efi_time *time,
	struct efi_time_cap *capabilities)
	{
	/* Nothing we can do */
	return EFI_DEVICE_ERROR;
	}

	struct efi_runtime_detach_list_struct {
	void *ptr;
	void *patchto;
	};

	static const struct efi_runtime_detach_list_struct efi_runtime_detach_list[] = {
	{
	/* do_reset is gone */
	.ptr = &efi_runtime_services.reset_system,
	.patchto = efi_reset_system,
	}, {
	/* invalidate_cache_all are gone /
	.ptr = &efi_runtime_services.set_virtual_address_map,
	.patchto = &efi_invalid_parameter,
	}, {
	/* RTC accessors are gone */
	.ptr = &efi_runtime_services.get_time,
	.patchto = &efi_get_time,
	}, {
	/* Clean up system table */
	.ptr = &systab.con_in,
	.patchto = NULL,
	}, {
	/* Clean up system table */
	.ptr = &systab.con_out,
	.patchto = NULL,
	}, {
	/* Clean up system table */
	.ptr = &systab.std_err,
	.patchto = NULL,
	}, {
	/* Clean up system table */
	.ptr = &systab.boottime,
	.patchto = NULL,
	}, {
	.ptr = &efi_runtime_services.get_variable,
	.patchto = &efi_device_error,
	}, {
	.ptr = &efi_runtime_services.get_next_variable_name,
	.patchto = &efi_device_error,
	}, {
	.ptr = &efi_runtime_services.set_variable,
	.patchto = &efi_device_error,
	}
	};

	static bool efi_runtime_tobedetached(void *p)
	{
	int i;

	for (i = 0; i < ARRAY_SIZE(efi_runtime_detach_list); i++)
	if (efi_runtime_detach_list[i].ptr == p)
	return true;

	return false;
	}

	static void efi_runtime_detach(ulong offset)
	{
	int i;
	ulong patchoff = offset - (ulong)gd->relocaddr;

	for (i = 0; i < ARRAY_SIZE(efi_runtime_detach_list); i++) {
	ulong patchto = (ulong)efi_runtime_detach_list[i].patchto;
	ulong *p = efi_runtime_detach_list[i].ptr;
	ulong newaddr = patchto ? (patchto + patchoff) : 0;

	debug("%s: Setting %p to %lx\n", __func__, p, newaddr);
	*p = newaddr;
	}

	/* Update CRC32 */
	efi_update_table_header_crc32(&efi_runtime_services.hdr);
	}

	/* Relocate EFI runtime to uboot_reloc_base = offset */
	void efi_runtime_relocate(ulong offset, struct efi_mem_desc *map)
	{
	#ifdef IS_RELA
	struct elf_rela rel = (void)&__efi_runtime_rel_start;
	#else
	struct elf_rel rel = (void)&__efi_runtime_rel_start;
	static ulong lastoff = CONFIG_SYS_TEXT_BASE;
	#endif

	debug("%s: Relocating to offset=%lx\n", __func__, offset);
	for (; (ulong)rel < (ulong)&__efi_runtime_rel_stop; rel++) {
	ulong base = CONFIG_SYS_TEXT_BASE;
	ulong *p;
	ulong newaddr;

	p = (void*)((ulong)rel->offset - base) + gd->relocaddr;

	debug("%s: rel->info=%#lx p=%#lx rel->offset=%p\n", __func__, rel->info, p, rel->offset);

	switch (rel->info & R_MASK) {
	case R_RELATIVE:
	#ifdef IS_RELA
	newaddr = rel->addend + offset - CONFIG_SYS_TEXT_BASE;
	#else
	newaddr = *p - lastoff + offset;
	#endif
	break;
	#ifdef R_ABSOLUTE
	case R_ABSOLUTE: {
	ulong symidx = rel->info >> SYM_INDEX;
	extern struct dyn_sym __dyn_sym_start[];
	newaddr = __dyn_sym_start[symidx].addr + offset;
	break;
	}
	#endif
	default:
	continue;
	}

	/* Check if the relocation is inside bounds */
	if (map && ((newaddr < map->virtual_start) \|\|
	newaddr > (map->virtual_start +
	(map->num_pages << EFI_PAGE_SHIFT)))) {
	if (!efi_runtime_tobedetached(p))
	printf("U-Boot EFI: Relocation at %p is out of "
	"range (%lx)\n", p, newaddr);
	continue;
	}

	debug("%s: Setting %p to %lx\n", __func__, p, newaddr);
	*p = newaddr;
	flush_dcache_range((ulong)p & ~(EFI_CACHELINE_SIZE - 1),
	ALIGN((ulong)&p[1], EFI_CACHELINE_SIZE));
	}

	#ifndef IS_RELA
	lastoff = offset;
	#endif

	invalidate_icache_all();
	}

	/**
	* efi_set_virtual_address_map() - change from physical to virtual mapping
	*
	* This function implements the SetVirtualAddressMap() runtime service.
	*
	* See the Unified Extensible Firmware Interface (UEFI) specification for
	* details.
	*
	* @memory_map_size: size of the virtual map
	* @descriptor_size: size of an entry in the map
	* @descriptor_version: version of the map entries
	* @virtmap: virtual address mapping information
	* Return: status code
	*/
	static efi_status_t EFIAPI efi_set_virtual_address_map(
	unsigned long memory_map_size,
	unsigned long descriptor_size,
	uint32_t descriptor_version,
	struct efi_mem_desc *virtmap)
	{
	ulong runtime_start = (ulong)&__efi_runtime_start &
	~(ulong)EFI_PAGE_MASK;
	int n = memory_map_size / descriptor_size;
	int i;

	EFI_ENTRY("%lx %lx %x %p", memory_map_size, descriptor_size,
	descriptor_version, virtmap);

	/* Rebind mmio pointers */
	for (i = 0; i < n; i++) {
	struct efi_mem_desc map = (void)virtmap +
	(descriptor_size * i);
	struct list_head *lhandle;
	efi_physical_addr_t map_start = map->physical_start;
	efi_physical_addr_t map_len = map->num_pages << EFI_PAGE_SHIFT;
	efi_physical_addr_t map_end = map_start + map_len;
	u64 off = map->virtual_start - map_start;

	/* Adjust all mmio pointers in this region */
	list_for_each(lhandle, &efi_runtime_mmio) {
	struct efi_runtime_mmio_list *lmmio;

	lmmio = list_entry(lhandle,
	struct efi_runtime_mmio_list,
	link);
	if ((map_start <= lmmio->paddr) &&
	(map_end >= lmmio->paddr)) {
	uintptr_t new_addr = lmmio->paddr + off;
	lmmio->ptr = (void )new_addr;
	}
	}
	if ((map_start <= (uintptr_t)systab.tables) &&
	(map_end >= (uintptr_t)systab.tables)) {
	char ptr = (char )systab.tables;

	ptr += off;
	systab.tables = (struct efi_configuration_table *)ptr;
	}
	}

	/* Move the actual runtime code over */
	for (i = 0; i < n; i++) {
	struct efi_mem_desc *map;

	map = (void)virtmap + (descriptor_size i);
	if (map->type == EFI_RUNTIME_SERVICES_CODE) {
	ulong new_offset = map->virtual_start -
	(runtime_start - gd->relocaddr);

	efi_runtime_relocate(new_offset, map);
	/* Once we're virtual, we can no longer handle
	complex callbacks */
	efi_runtime_detach(new_offset);
	return EFI_EXIT(EFI_SUCCESS);
	}
	}

	return EFI_EXIT(EFI_INVALID_PARAMETER);
	}

	/**
	* efi_add_runtime_mmio() - add memory-mapped IO region
	*
	* This function adds a memory-mapped IO region to the memory map to make it
	* available at runtime.
	*
	* @mmio_ptr: address of the memory-mapped IO region
	* @len: size of the memory-mapped IO region
	* Returns: status code
	*/
	efi_status_t efi_add_runtime_mmio(void *mmio_ptr, u64 len)
	{
	struct efi_runtime_mmio_list *newmmio;
	u64 pages = (len + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT;
	uint64_t addr = (uintptr_t )mmio_ptr;
	uint64_t retaddr;

	retaddr = efi_add_memory_map(addr, pages, EFI_MMAP_IO, false);
	if (retaddr != addr)
	return EFI_OUT_OF_RESOURCES;

	newmmio = calloc(1, sizeof(*newmmio));
	if (!newmmio)
	return EFI_OUT_OF_RESOURCES;
	newmmio->ptr = mmio_ptr;
	newmmio->paddr = (uintptr_t )mmio_ptr;
	newmmio->len = len;
	list_add_tail(&newmmio->link, &efi_runtime_mmio);

	return EFI_SUCCESS;
	}

	/*
	* In the second stage, U-Boot has disappeared. To isolate our runtime code
	* that at this point still exists from the rest, we put it into a special
	* section.
	*
	* !!WARNING!!
	*
	* This means that we can not rely on any code outside of this file in any
	* function or variable below this line.
	*
	* Please keep everything fully self-contained and annotated with
	* __efi_runtime and __efi_runtime_data markers.
	*/

	/*
	* Relocate the EFI runtime stub to a different place. We need to call this
	* the first time we expose the runtime interface to a user and on set virtual
	* address map calls.
	*/

	/**
	* efi_unimplemented() - replacement function, returns EFI_UNSUPPORTED
	*
	* This function is used after SetVirtualAddressMap() is called as replacement
	* for services that are not available anymore due to constraints of the U-Boot
	* implementation.
	*
	* Return: EFI_UNSUPPORTED
	*/
	static efi_status_t __efi_runtime EFIAPI efi_unimplemented(void)
	{
	return EFI_UNSUPPORTED;
	}

	/**
	* efi_device_error() - replacement function, returns EFI_DEVICE_ERROR
	*
	* This function is used after SetVirtualAddressMap() is called as replacement
	* for services that are not available anymore due to constraints of the U-Boot
	* implementation.
	*
	* Return: EFI_DEVICE_ERROR
	*/
	static efi_status_t __efi_runtime EFIAPI efi_device_error(void)
	{
	return EFI_DEVICE_ERROR;
	}

	/**
	* efi_invalid_parameter() - replacement function, returns EFI_INVALID_PARAMETER
	*
	* This function is used after SetVirtualAddressMap() is called as replacement
	* for services that are not available anymore due to constraints of the U-Boot
	* implementation.
	*
	* Return: EFI_INVALID_PARAMETER
	*/
	static efi_status_t __efi_runtime EFIAPI efi_invalid_parameter(void)
	{
	return EFI_INVALID_PARAMETER;
	}

	/**
	* efi_update_capsule() - process information from operating system
	*
	* This function implements the UpdateCapsule() runtime service.
	*
	* See the Unified Extensible Firmware Interface (UEFI) specification for
	* details.
	*
	* @capsule_header_array: pointer to array of virtual pointers
	* @capsule_count: number of pointers in capsule_header_array
	* @scatter_gather_list: pointer to arry of physical pointers
	* Returns: status code
	*/
	efi_status_t __efi_runtime EFIAPI efi_update_capsule(
	struct efi_capsule_header **capsule_header_array,
	efi_uintn_t capsule_count,
	u64 scatter_gather_list)
	{
	return EFI_UNSUPPORTED;
	}

	/**
	* efi_query_capsule_caps() - check if capsule is supported
	*
	* This function implements the QueryCapsuleCapabilities() runtime service.
	*
	* See the Unified Extensible Firmware Interface (UEFI) specification for
	* details.
	*
	* @capsule_header_array: pointer to array of virtual pointers
	* @capsule_count: number of pointers in capsule_header_array
	* @maximum_capsule_size: maximum capsule size
	* @reset_type: type of reset needed for capsule update
	* Returns: status code
	*/
	efi_status_t __efi_runtime EFIAPI efi_query_capsule_caps(
	struct efi_capsule_header **capsule_header_array,
	efi_uintn_t capsule_count,
	u64 maximum_capsule_size,
	u32 reset_type)
	{
	return EFI_UNSUPPORTED;
	}

	/**
	* efi_query_variable_info() - get information about EFI variables
	*
	* This function implements the QueryVariableInfo() runtime service.
	*
	* See the Unified Extensible Firmware Interface (UEFI) specification for
	* details.
	*
	* @attributes: bitmask to select variables to be
	* queried
	* @maximum_variable_storage_size: maximum size of storage area for the
	* selected variable types
	* @remaining_variable_storage_size: remaining size of storage are for the
	* selected variable types
	* @maximum_variable_size: maximum size of a variable of the
	* selected type
	* Returns: status code
	*/
	efi_status_t __efi_runtime EFIAPI efi_query_variable_info(
	u32 attributes,
	u64 *maximum_variable_storage_size,
	u64 *remaining_variable_storage_size,
	u64 *maximum_variable_size)
	{
	return EFI_UNSUPPORTED;
	}

	struct efi_runtime_services __efi_runtime_data efi_runtime_services = {
	.hdr = {
	.signature = EFI_RUNTIME_SERVICES_SIGNATURE,
	.revision = EFI_SPECIFICATION_VERSION,
	.headersize = sizeof(struct efi_runtime_services),
	},
	.get_time = &efi_get_time_boottime,
	.set_time = (void *)&efi_device_error,
	.get_wakeup_time = (void *)&efi_unimplemented,
	.set_wakeup_time = (void *)&efi_unimplemented,
	.set_virtual_address_map = &efi_set_virtual_address_map,
	.convert_pointer = (void *)&efi_invalid_parameter,
	.get_variable = efi_get_variable,
	.get_next_variable_name = efi_get_next_variable_name,
	.set_variable = efi_set_variable,
	.get_next_high_mono_count = (void *)&efi_device_error,
	.reset_system = &efi_reset_system_boottime,
	.update_capsule = efi_update_capsule,
	.query_capsule_caps = efi_query_capsule_caps,
	.query_variable_info = efi_query_variable_info,
	};