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 EFI_ENTRY(format, ...) do { \
  19         efi_restore_gd(); \
  20         debug("EFI: Entry %s(" format ")\n", __func__, ##__VA_ARGS__); \
  21         } while(0)
  22
  23 #define EFI_EXIT(ret) efi_exit_func(ret);
  24
  25 extern struct efi_runtime_services efi_runtime_services;
  26 extern struct efi_system_table systab;
  27
  28 extern const struct efi_simple_text_output_protocol efi_con_out;
  29 extern const struct efi_simple_input_interface efi_con_in;
  30 extern const struct efi_console_control_protocol efi_console_control;
  31
  32 extern const efi_guid_t efi_guid_console_control;
  33 extern const efi_guid_t efi_guid_device_path;
  34 extern const efi_guid_t efi_guid_loaded_image;
  35
  36 extern unsigned int __efi_runtime_start, __efi_runtime_stop;
  37 extern unsigned int __efi_runtime_rel_start, __efi_runtime_rel_stop;
  38
  39 /*
  40  * While UEFI objects can have callbacks, you can also call functions on
  41  * protocols (classes) themselves. This struct maps a protocol GUID to its
  42  * interface (usually a struct with callback functions).
  43  */
  44 struct efi_class_map {
  45         const efi_guid_t *guid;
  46         const void *interface;
  47 };
  48
  49 /*
  50  * When the UEFI payload wants to open a protocol on an object to get its
  51  * interface (usually a struct with callback functions), this struct maps the
  52  * protocol GUID to the respective protocol handler open function for that
  53  * object protocol combination.
  54  */
  55 struct efi_handler {
  56         const efi_guid_t *guid;
  57         efi_status_t (EFIAPI *open)(void *handle,
  58                         efi_guid_t *protocol, void **protocol_interface,
  59                         void *agent_handle, void *controller_handle,
  60                         uint32_t attributes);
  61 };
  62
  63 /*
  64  * UEFI has a poor man's OO model where one "object" can be polymorphic and have
  65  * multiple different protocols (classes) attached to it.
  66  *
  67  * This struct is the parent struct for all of our actual implementation objects
  68  * that can include it to make themselves an EFI object
  69  */
  70 struct efi_object {
  71         /* Every UEFI object is part of a global object list */
  72         struct list_head link;
  73         /* We support up to 4 "protocols" an object can be accessed through */
  74         struct efi_handler protocols[4];
  75         /* The object spawner can either use this for data or as identifier */
  76         void *handle;
  77 };
  78
  79 /* This list contains all UEFI objects we know of */
  80 extern struct list_head efi_obj_list;
  81
  82 /* Called by bootefi to make all disk storage accessible as EFI objects */
  83 int efi_disk_register(void);
  84 /* Called by bootefi to make GOP (graphical) interface available */
  85 int efi_gop_register(void);
  86 /* Called by bootefi to make the network interface available */
  87 int efi_net_register(void **handle);
  88
  89 /* Called by networking code to memorize the dhcp ack package */
  90 void efi_net_set_dhcp_ack(void *pkt, int len);
  91
  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 /* Call this to set the current device name */
 113 void efi_set_bootdev(const char *dev, const char *devnr, const char *path);
 114
 115 /* Generic EFI memory allocator, call this to get memory */
 116 void *efi_alloc(uint64_t len, int memory_type);
 117 /* More specific EFI memory allocator, called by EFI payloads */
 118 efi_status_t efi_allocate_pages(int type, int memory_type, unsigned long pages,
 119                                 uint64_t *memory);
 120 /* EFI memory free function. Not implemented today */
 121 efi_status_t efi_free_pages(uint64_t memory, unsigned long pages);
 122 /* Returns the EFI memory map */
 123 efi_status_t efi_get_memory_map(unsigned long *memory_map_size,
 124                                 struct efi_mem_desc *memory_map,
 125                                 unsigned long *map_key,
 126                                 unsigned long *descriptor_size,
 127                                 uint32_t *descriptor_version);
 128 /* Adds a range into the EFI memory map */
 129 uint64_t efi_add_memory_map(uint64_t start, uint64_t pages, int memory_type,
 130                             bool overlap_only_ram);
 131 /* Called by board init to initialize the EFI memory map */
 132 int efi_memory_init(void);
 133
 134 #ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
 135 extern void *efi_bounce_buffer;
 136 #define EFI_LOADER_BOUNCE_BUFFER_SIZE (64 * 1024 * 1024)
 137 #endif
 138
 139 /* Convert strings from normal C strings to uEFI strings */
 140 static inline void ascii2unicode(u16 *unicode, const char *ascii)
 141 {
 142         while (*ascii)
 143                 *(unicode++) = *(ascii++);
 144 }
 145
 146 /*
 147  * Use these to indicate that your code / data should go into the EFI runtime
 148  * section and thus still be available when the OS is running
 149  */
 150 #define EFI_RUNTIME_DATA __attribute__ ((section ("efi_runtime_data")))
 151 #define EFI_RUNTIME_TEXT __attribute__ ((section ("efi_runtime_text")))
 152
 153 #else /* defined(EFI_LOADER) && !defined(CONFIG_SPL_BUILD) */
 154
 155 /* Without CONFIG_EFI_LOADER we don't have a runtime section, stub it out */
 156 #define EFI_RUNTIME_DATA
 157 #define EFI_RUNTIME_TEXT
 158
 159 /* No loader configured, stub out EFI_ENTRY */
 160 static inline void efi_restore_gd(void) { }
 161 static inline void efi_set_bootdev(const char *dev, const char *devnr,
 162                                    const char *path) { }
 163 static inline void efi_net_set_dhcp_ack(void *pkt, int len) { }
 164
 165 #endif