2 * EFI application loader
4 * Copyright (c) 2016 Alexander Graf
6 * SPDX-License-Identifier: GPL-2.0+
13 /* No need for efi loader support in SPL */
14 #if defined(CONFIG_EFI_LOADER) && !defined(CONFIG_SPL_BUILD)
16 #include <linux/list.h>
18 /* #define DEBUG_EFI */
21 #define EFI_ENTRY(format, ...) do { \
23 printf("EFI: Entry %s(" format ")\n", __func__, ##__VA_ARGS__); \
26 #define EFI_ENTRY(format, ...) do { \
31 #define EFI_EXIT(ret) efi_exit_func(ret);
33 extern struct efi_runtime_services efi_runtime_services;
34 extern struct efi_system_table systab;
36 extern const struct efi_simple_text_output_protocol efi_con_out;
37 extern const struct efi_simple_input_interface efi_con_in;
38 extern const struct efi_console_control_protocol efi_console_control;
40 extern const efi_guid_t efi_guid_console_control;
41 extern const efi_guid_t efi_guid_device_path;
42 extern const efi_guid_t efi_guid_loaded_image;
44 extern unsigned int __efi_runtime_start, __efi_runtime_stop;
45 extern unsigned int __efi_runtime_rel_start, __efi_runtime_rel_stop;
48 * While UEFI objects can have callbacks, you can also call functions on
49 * protocols (classes) themselves. This struct maps a protocol GUID to its
50 * interface (usually a struct with callback functions).
52 struct efi_class_map {
53 const efi_guid_t *guid;
54 const void *interface;
58 * When the UEFI payload wants to open a protocol on an object to get its
59 * interface (usually a struct with callback functions), this struct maps the
60 * protocol GUID to the respective protocol handler open function for that
61 * object protocol combination.
64 const efi_guid_t *guid;
65 efi_status_t (EFIAPI *open)(void *handle,
66 efi_guid_t *protocol, void **protocol_interface,
67 void *agent_handle, void *controller_handle,
72 * UEFI has a poor man's OO model where one "object" can be polymorphic and have
73 * multiple different protocols (classes) attached to it.
75 * This struct is the parent struct for all of our actual implementation objects
76 * that can include it to make themselves an EFI object
79 /* Every UEFI object is part of a global object list */
80 struct list_head link;
81 /* We support up to 4 "protocols" an object can be accessed through */
82 struct efi_handler protocols[4];
83 /* The object spawner can either use this for data or as identifier */
87 /* This list contains all UEFI objects we know of */
88 extern struct list_head efi_obj_list;
90 /* Called by bootefi to make all disk storage accessible as EFI objects */
91 int efi_disk_register(void);
93 * Stub implementation for a protocol opener that just returns the handle as
96 efi_status_t efi_return_handle(void *handle,
97 efi_guid_t *protocol, void **protocol_interface,
98 void *agent_handle, void *controller_handle,
100 /* Called from places to check whether a timer expired */
101 void efi_timer_check(void);
102 /* PE loader implementation */
103 void *efi_load_pe(void *efi, struct efi_loaded_image *loaded_image_info);
104 /* Called once to store the pristine gd pointer */
105 void efi_save_gd(void);
106 /* Called from EFI_ENTRY on callback entry to put gd into the gd register */
107 void efi_restore_gd(void);
108 /* Called from EFI_EXIT on callback exit to restore the gd register */
109 efi_status_t efi_exit_func(efi_status_t ret);
110 /* Call this to relocate the runtime section to an address space */
111 void efi_runtime_relocate(ulong offset, struct efi_mem_desc *map);
114 * Use these to indicate that your code / data should go into the EFI runtime
115 * section and thus still be available when the OS is running
117 #define EFI_RUNTIME_DATA __attribute__ ((section ("efi_runtime_data")))
118 #define EFI_RUNTIME_TEXT __attribute__ ((section ("efi_runtime_text")))
120 #else /* defined(EFI_LOADER) && !defined(CONFIG_SPL_BUILD) */
122 /* Without CONFIG_EFI_LOADER we don't have a runtime section, stub it out */
123 #define EFI_RUNTIME_DATA
124 #define EFI_RUNTIME_TEXT
126 /* No loader configured, stub out EFI_ENTRY */
127 static inline void efi_restore_gd(void) { }