162 lines
5.4 KiB
C
162 lines
5.4 KiB
C
/*
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* EFI application loader
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*
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* Copyright (c) 2016 Alexander Graf
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <part_efi.h>
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#include <efi_api.h>
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/* No need for efi loader support in SPL */
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#if defined(CONFIG_EFI_LOADER) && !defined(CONFIG_SPL_BUILD)
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#include <linux/list.h>
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/* #define DEBUG_EFI */
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#ifdef DEBUG_EFI
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#define EFI_ENTRY(format, ...) do { \
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efi_restore_gd(); \
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printf("EFI: Entry %s(" format ")\n", __func__, ##__VA_ARGS__); \
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} while(0)
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#else
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#define EFI_ENTRY(format, ...) do { \
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efi_restore_gd(); \
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} while(0)
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#endif
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#define EFI_EXIT(ret) efi_exit_func(ret);
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extern struct efi_runtime_services efi_runtime_services;
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extern struct efi_system_table systab;
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extern const struct efi_simple_text_output_protocol efi_con_out;
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extern const struct efi_simple_input_interface efi_con_in;
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extern const struct efi_console_control_protocol efi_console_control;
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extern const efi_guid_t efi_guid_console_control;
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extern const efi_guid_t efi_guid_device_path;
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extern const efi_guid_t efi_guid_loaded_image;
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extern unsigned int __efi_runtime_start, __efi_runtime_stop;
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extern unsigned int __efi_runtime_rel_start, __efi_runtime_rel_stop;
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/*
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* While UEFI objects can have callbacks, you can also call functions on
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* protocols (classes) themselves. This struct maps a protocol GUID to its
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* interface (usually a struct with callback functions).
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*/
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struct efi_class_map {
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const efi_guid_t *guid;
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const void *interface;
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};
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/*
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* When the UEFI payload wants to open a protocol on an object to get its
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* interface (usually a struct with callback functions), this struct maps the
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* protocol GUID to the respective protocol handler open function for that
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* object protocol combination.
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*/
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struct efi_handler {
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const efi_guid_t *guid;
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efi_status_t (EFIAPI *open)(void *handle,
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efi_guid_t *protocol, void **protocol_interface,
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void *agent_handle, void *controller_handle,
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uint32_t attributes);
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};
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/*
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* UEFI has a poor man's OO model where one "object" can be polymorphic and have
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* multiple different protocols (classes) attached to it.
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*
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* This struct is the parent struct for all of our actual implementation objects
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* that can include it to make themselves an EFI object
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*/
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struct efi_object {
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/* Every UEFI object is part of a global object list */
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struct list_head link;
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/* We support up to 4 "protocols" an object can be accessed through */
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struct efi_handler protocols[4];
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/* The object spawner can either use this for data or as identifier */
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void *handle;
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};
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/* This list contains all UEFI objects we know of */
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extern struct list_head efi_obj_list;
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/* Called by bootefi to make all disk storage accessible as EFI objects */
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int efi_disk_register(void);
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/* Called by bootefi to make GOP (graphical) interface available */
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int efi_gop_register(void);
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/*
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* Stub implementation for a protocol opener that just returns the handle as
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* interface
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*/
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efi_status_t efi_return_handle(void *handle,
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efi_guid_t *protocol, void **protocol_interface,
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void *agent_handle, void *controller_handle,
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uint32_t attributes);
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/* Called from places to check whether a timer expired */
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void efi_timer_check(void);
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/* PE loader implementation */
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void *efi_load_pe(void *efi, struct efi_loaded_image *loaded_image_info);
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/* Called once to store the pristine gd pointer */
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void efi_save_gd(void);
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/* Called from EFI_ENTRY on callback entry to put gd into the gd register */
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void efi_restore_gd(void);
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/* Called from EFI_EXIT on callback exit to restore the gd register */
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efi_status_t efi_exit_func(efi_status_t ret);
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/* Call this to relocate the runtime section to an address space */
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void efi_runtime_relocate(ulong offset, struct efi_mem_desc *map);
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/* Call this to set the current device name */
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void efi_set_bootdev(const char *dev, const char *devnr, const char *path);
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/* Generic EFI memory allocator, call this to get memory */
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void *efi_alloc(uint64_t len, int memory_type);
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/* More specific EFI memory allocator, called by EFI payloads */
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efi_status_t efi_allocate_pages(int type, int memory_type, unsigned long pages,
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uint64_t *memory);
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/* EFI memory free function. Not implemented today */
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efi_status_t efi_free_pages(uint64_t memory, unsigned long pages);
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/* Returns the EFI memory map */
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efi_status_t efi_get_memory_map(unsigned long *memory_map_size,
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struct efi_mem_desc *memory_map,
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unsigned long *map_key,
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unsigned long *descriptor_size,
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uint32_t *descriptor_version);
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/* Adds a range into the EFI memory map */
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uint64_t efi_add_memory_map(uint64_t start, uint64_t pages, int memory_type,
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bool overlap_only_ram);
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/* Called by board init to initialize the EFI memory map */
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int efi_memory_init(void);
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/* Convert strings from normal C strings to uEFI strings */
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static inline void ascii2unicode(u16 *unicode, char *ascii)
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{
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while (*ascii)
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*(unicode++) = *(ascii++);
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}
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/*
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* Use these to indicate that your code / data should go into the EFI runtime
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* section and thus still be available when the OS is running
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*/
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#define EFI_RUNTIME_DATA __attribute__ ((section ("efi_runtime_data")))
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#define EFI_RUNTIME_TEXT __attribute__ ((section ("efi_runtime_text")))
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#else /* defined(EFI_LOADER) && !defined(CONFIG_SPL_BUILD) */
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/* Without CONFIG_EFI_LOADER we don't have a runtime section, stub it out */
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#define EFI_RUNTIME_DATA
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#define EFI_RUNTIME_TEXT
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/* No loader configured, stub out EFI_ENTRY */
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static inline void efi_restore_gd(void) { }
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static inline void efi_set_bootdev(const char *dev, const char *devnr,
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const char *path) { }
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#endif
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