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/*
* EFI application loader
*
* Copyright (c) 2016 Alexander Graf
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <part_efi.h>
#include <efi_api.h>
/* No need for efi loader support in SPL */
#if defined(CONFIG_EFI_LOADER) && !defined(CONFIG_SPL_BUILD)
#include <linux/list.h>
/* #define DEBUG_EFI */
#ifdef DEBUG_EFI
#define EFI_ENTRY(format, ...) do { \
efi_restore_gd(); \
printf("EFI: Entry %s(" format ")\n", __func__, ##__VA_ARGS__); \
} while(0)
#else
#define EFI_ENTRY(format, ...) do { \
efi_restore_gd(); \
} while(0)
#endif
#define EFI_EXIT(ret) efi_exit_func(ret);
extern struct efi_system_table systab;
extern const efi_guid_t efi_guid_device_path;
extern const efi_guid_t efi_guid_loaded_image;
/*
* While UEFI objects can have callbacks, you can also call functions on
* protocols (classes) themselves. This struct maps a protocol GUID to its
* interface (usually a struct with callback functions).
*/
struct efi_class_map {
const efi_guid_t *guid;
const void *interface;
};
/*
* When the UEFI payload wants to open a protocol on an object to get its
* interface (usually a struct with callback functions), this struct maps the
* protocol GUID to the respective protocol handler open function for that
* object protocol combination.
*/
struct efi_handler {
const efi_guid_t *guid;
efi_status_t (EFIAPI *open)(void *handle,
efi_guid_t *protocol, void **protocol_interface,
void *agent_handle, void *controller_handle,
uint32_t attributes);
};
/*
* UEFI has a poor man's OO model where one "object" can be polymorphic and have
* multiple different protocols (classes) attached to it.
*
* This struct is the parent struct for all of our actual implementation objects
* that can include it to make themselves an EFI object
*/
struct efi_object {
/* Every UEFI object is part of a global object list */
struct list_head link;
/* We support up to 4 "protocols" an object can be accessed through */
struct efi_handler protocols[4];
/* The object spawner can either use this for data or as identifier */
void *handle;
};
/* This list contains all UEFI objects we know of */
extern struct list_head efi_obj_list;
/*
* Stub implementation for a protocol opener that just returns the handle as
* interface
*/
efi_status_t efi_return_handle(void *handle,
efi_guid_t *protocol, void **protocol_interface,
void *agent_handle, void *controller_handle,
uint32_t attributes);
/* Called from places to check whether a timer expired */
void efi_timer_check(void);
/* PE loader implementation */
void *efi_load_pe(void *efi, struct efi_loaded_image *loaded_image_info);
/* Called once to store the pristine gd pointer */
void efi_save_gd(void);
/* Called from EFI_ENTRY on callback entry to put gd into the gd register */
void efi_restore_gd(void);
/* Called from EFI_EXIT on callback exit to restore the gd register */
efi_status_t efi_exit_func(efi_status_t ret);
#else /* defined(EFI_LOADER) && !defined(CONFIG_SPL_BUILD) */
/* No loader configured, stub out EFI_ENTRY */
static inline void efi_restore_gd(void) { }
#endif
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