include/efi_loader.h

   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 /* Called by bootefi to make GOP (graphical) interface available */
  93 int efi_gop_register(void);
  94 /* Called by bootefi to make the network interface available */
  95 int efi_net_register(void **handle);
  96
  97 /* Called by networking code to memorize the dhcp ack package */
  98 void efi_net_set_dhcp_ack(void *pkt, int len);
  99
 100 /*
 101  * Stub implementation for a protocol opener that just returns the handle as
 102  * interface
 103  */
 104 efi_status_t efi_return_handle(void *handle,
 105                 efi_guid_t *protocol, void **protocol_interface,
 106                 void *agent_handle, void *controller_handle,
 107                 uint32_t attributes);
 108 /* Called from places to check whether a timer expired */
 109 void efi_timer_check(void);
 110 /* PE loader implementation */
 111 void *efi_load_pe(void *efi, struct efi_loaded_image *loaded_image_info);
 112 /* Called once to store the pristine gd pointer */
 113 void efi_save_gd(void);
 114 /* Called from EFI_ENTRY on callback entry to put gd into the gd register */
 115 void efi_restore_gd(void);
 116 /* Called from EFI_EXIT on callback exit to restore the gd register */
 117 efi_status_t efi_exit_func(efi_status_t ret);
 118 /* Call this to relocate the runtime section to an address space */
 119 void efi_runtime_relocate(ulong offset, struct efi_mem_desc *map);
 120 /* Call this to set the current device name */
 121 void efi_set_bootdev(const char *dev, const char *devnr, const char *path);
 122
 123 /* Generic EFI memory allocator, call this to get memory */
 124 void *efi_alloc(uint64_t len, int memory_type);
 125 /* More specific EFI memory allocator, called by EFI payloads */
 126 efi_status_t efi_allocate_pages(int type, int memory_type, unsigned long pages,
 127                                 uint64_t *memory);
 128 /* EFI memory free function. Not implemented today */
 129 efi_status_t efi_free_pages(uint64_t memory, unsigned long pages);
 130 /* Returns the EFI memory map */
 131 efi_status_t efi_get_memory_map(unsigned long *memory_map_size,
 132                                 struct efi_mem_desc *memory_map,
 133                                 unsigned long *map_key,
 134                                 unsigned long *descriptor_size,
 135                                 uint32_t *descriptor_version);
 136 /* Adds a range into the EFI memory map */
 137 uint64_t efi_add_memory_map(uint64_t start, uint64_t pages, int memory_type,
 138                             bool overlap_only_ram);
 139 /* Called by board init to initialize the EFI memory map */
 140 int efi_memory_init(void);
 141
 142 #ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
 143 extern void *efi_bounce_buffer;
 144 #define EFI_LOADER_BOUNCE_BUFFER_SIZE (64 * 1024 * 1024)
 145 #endif
 146
 147 /* Convert strings from normal C strings to uEFI strings */
 148 static inline void ascii2unicode(u16 *unicode, const char *ascii)
 149 {
 150         while (*ascii)
 151                 *(unicode++) = *(ascii++);
 152 }
 153
 154 /*
 155  * Use these to indicate that your code / data should go into the EFI runtime
 156  * section and thus still be available when the OS is running
 157  */
 158 #define EFI_RUNTIME_DATA __attribute__ ((section ("efi_runtime_data")))
 159 #define EFI_RUNTIME_TEXT __attribute__ ((section ("efi_runtime_text")))
 160
 161 #else /* defined(EFI_LOADER) && !defined(CONFIG_SPL_BUILD) */
 162
 163 /* Without CONFIG_EFI_LOADER we don't have a runtime section, stub it out */
 164 #define EFI_RUNTIME_DATA
 165 #define EFI_RUNTIME_TEXT
 166
 167 /* No loader configured, stub out EFI_ENTRY */
 168 static inline void efi_restore_gd(void) { }
 169 static inline void efi_set_bootdev(const char *dev, const char *devnr,
 170                                    const char *path) { }
 171 static inline void efi_net_set_dhcp_ack(void *pkt, int len) { }
 172
 173 #endif