1 /* 2 * EFI application loader 3 * 4 * Copyright (c) 2016 Alexander Graf 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 #include <common.h> 10 #include <part_efi.h> 11 #include <efi_api.h> 12 13 /* No need for efi loader support in SPL */ 14 #if defined(CONFIG_EFI_LOADER) && !defined(CONFIG_SPL_BUILD) 15 16 #include <linux/list.h> 17 18 /* #define DEBUG_EFI */ 19 20 #ifdef DEBUG_EFI 21 #define EFI_ENTRY(format, ...) do { \ 22 efi_restore_gd(); \ 23 printf("EFI: Entry %s(" format ")\n", __func__, ##__VA_ARGS__); \ 24 } while(0) 25 #else 26 #define EFI_ENTRY(format, ...) do { \ 27 efi_restore_gd(); \ 28 } while(0) 29 #endif 30 31 #define EFI_EXIT(ret) efi_exit_func(ret); 32 33 extern struct efi_system_table systab; 34 35 extern const struct efi_simple_text_output_protocol efi_con_out; 36 extern const struct efi_simple_input_interface efi_con_in; 37 extern const struct efi_console_control_protocol efi_console_control; 38 39 extern const efi_guid_t efi_guid_console_control; 40 extern const efi_guid_t efi_guid_device_path; 41 extern const efi_guid_t efi_guid_loaded_image; 42 43 /* 44 * While UEFI objects can have callbacks, you can also call functions on 45 * protocols (classes) themselves. This struct maps a protocol GUID to its 46 * interface (usually a struct with callback functions). 47 */ 48 struct efi_class_map { 49 const efi_guid_t *guid; 50 const void *interface; 51 }; 52 53 /* 54 * When the UEFI payload wants to open a protocol on an object to get its 55 * interface (usually a struct with callback functions), this struct maps the 56 * protocol GUID to the respective protocol handler open function for that 57 * object protocol combination. 58 */ 59 struct efi_handler { 60 const efi_guid_t *guid; 61 efi_status_t (EFIAPI *open)(void *handle, 62 efi_guid_t *protocol, void **protocol_interface, 63 void *agent_handle, void *controller_handle, 64 uint32_t attributes); 65 }; 66 67 /* 68 * UEFI has a poor man's OO model where one "object" can be polymorphic and have 69 * multiple different protocols (classes) attached to it. 70 * 71 * This struct is the parent struct for all of our actual implementation objects 72 * that can include it to make themselves an EFI object 73 */ 74 struct efi_object { 75 /* Every UEFI object is part of a global object list */ 76 struct list_head link; 77 /* We support up to 4 "protocols" an object can be accessed through */ 78 struct efi_handler protocols[4]; 79 /* The object spawner can either use this for data or as identifier */ 80 void *handle; 81 }; 82 83 /* This list contains all UEFI objects we know of */ 84 extern struct list_head efi_obj_list; 85 86 /* 87 * Stub implementation for a protocol opener that just returns the handle as 88 * interface 89 */ 90 efi_status_t efi_return_handle(void *handle, 91 efi_guid_t *protocol, void **protocol_interface, 92 void *agent_handle, void *controller_handle, 93 uint32_t attributes); 94 /* Called from places to check whether a timer expired */ 95 void efi_timer_check(void); 96 /* PE loader implementation */ 97 void *efi_load_pe(void *efi, struct efi_loaded_image *loaded_image_info); 98 /* Called once to store the pristine gd pointer */ 99 void efi_save_gd(void); 100 /* Called from EFI_ENTRY on callback entry to put gd into the gd register */ 101 void efi_restore_gd(void); 102 /* Called from EFI_EXIT on callback exit to restore the gd register */ 103 efi_status_t efi_exit_func(efi_status_t ret); 104 105 #else /* defined(EFI_LOADER) && !defined(CONFIG_SPL_BUILD) */ 106 107 /* No loader configured, stub out EFI_ENTRY */ 108 static inline void efi_restore_gd(void) { } 109 110 #endif 111