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_runtime_services efi_runtime_services; 34 extern struct efi_system_table systab; 35 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; 39 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; 43 44 extern unsigned int __efi_runtime_start, __efi_runtime_stop; 45 extern unsigned int __efi_runtime_rel_start, __efi_runtime_rel_stop; 46 47 /* 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). 51 */ 52 struct efi_class_map { 53 const efi_guid_t *guid; 54 const void *interface; 55 }; 56 57 /* 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. 62 */ 63 struct efi_handler { 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, 68 uint32_t attributes); 69 }; 70 71 /* 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. 74 * 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 77 */ 78 struct 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 */ 84 void *handle; 85 }; 86 87 /* This list contains all UEFI objects we know of */ 88 extern struct list_head efi_obj_list; 89 90 /* Called by bootefi to make all disk storage accessible as EFI objects */ 91 int efi_disk_register(void); 92 /* 93 * Stub implementation for a protocol opener that just returns the handle as 94 * interface 95 */ 96 efi_status_t efi_return_handle(void *handle, 97 efi_guid_t *protocol, void **protocol_interface, 98 void *agent_handle, void *controller_handle, 99 uint32_t attributes); 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); 112 113 /* 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 116 */ 117 #define EFI_RUNTIME_DATA __attribute__ ((section ("efi_runtime_data"))) 118 #define EFI_RUNTIME_TEXT __attribute__ ((section ("efi_runtime_text"))) 119 120 #else /* defined(EFI_LOADER) && !defined(CONFIG_SPL_BUILD) */ 121 122 /* Without CONFIG_EFI_LOADER we don't have a runtime section, stub it out */ 123 #define EFI_RUNTIME_DATA 124 #define EFI_RUNTIME_TEXT 125 126 /* No loader configured, stub out EFI_ENTRY */ 127 static inline void efi_restore_gd(void) { } 128 129 #endif 130