/* * EFI application boot time services * * Copyright (c) 2016 Alexander Graf * * SPDX-License-Identifier: GPL-2.0+ */ #include #include #include #include #include #include #include #include #include #include #include DECLARE_GLOBAL_DATA_PTR; /* Task priority level */ static efi_uintn_t efi_tpl = TPL_APPLICATION; /* This list contains all the EFI objects our payload has access to */ LIST_HEAD(efi_obj_list); /* * If we're running on nasty systems (32bit ARM booting into non-EFI Linux) * we need to do trickery with caches. Since we don't want to break the EFI * aware boot path, only apply hacks when loading exiting directly (breaking * direct Linux EFI booting along the way - oh well). */ static bool efi_is_direct_boot = true; /* * EFI can pass arbitrary additional "tables" containing vendor specific * information to the payload. One such table is the FDT table which contains * a pointer to a flattened device tree blob. * * In most cases we want to pass an FDT to the payload, so reserve one slot of * config table space for it. The pointer gets populated by do_bootefi_exec(). */ static struct efi_configuration_table __efi_runtime_data efi_conf_table[2]; #ifdef CONFIG_ARM /* * The "gd" pointer lives in a register on ARM and AArch64 that we declare * fixed when compiling U-Boot. However, the payload does not know about that * restriction so we need to manually swap its and our view of that register on * EFI callback entry/exit. */ static volatile void *efi_gd, *app_gd; #endif static int entry_count; static int nesting_level; /* Called on every callback entry */ int __efi_entry_check(void) { int ret = entry_count++ == 0; #ifdef CONFIG_ARM assert(efi_gd); app_gd = gd; gd = efi_gd; #endif return ret; } /* Called on every callback exit */ int __efi_exit_check(void) { int ret = --entry_count == 0; #ifdef CONFIG_ARM gd = app_gd; #endif return ret; } /* Called from do_bootefi_exec() */ void efi_save_gd(void) { #ifdef CONFIG_ARM efi_gd = gd; #endif } /* * Special case handler for error/abort that just forces things back * to u-boot world so we can dump out an abort msg, without any care * about returning back to UEFI world. */ void efi_restore_gd(void) { #ifdef CONFIG_ARM /* Only restore if we're already in EFI context */ if (!efi_gd) return; gd = efi_gd; #endif } /* * Two spaces per indent level, maxing out at 10.. which ought to be * enough for anyone ;-) */ static const char *indent_string(int level) { const char *indent = " "; const int max = strlen(indent); level = min(max, level * 2); return &indent[max - level]; } const char *__efi_nesting(void) { return indent_string(nesting_level); } const char *__efi_nesting_inc(void) { return indent_string(nesting_level++); } const char *__efi_nesting_dec(void) { return indent_string(--nesting_level); } /* * Queue an EFI event. * * This function queues the notification function of the event for future * execution. * * The notification function is called if the task priority level of the * event is higher than the current task priority level. * * For the SignalEvent service see efi_signal_event_ext. * * @event event to signal */ void efi_signal_event(struct efi_event *event) { if (event->notify_function) { event->is_queued = true; /* Check TPL */ if (efi_tpl >= event->notify_tpl) return; EFI_CALL_VOID(event->notify_function(event, event->notify_context)); } event->is_queued = false; } /* * Raise the task priority level. * * This function implements the RaiseTpl service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @new_tpl new value of the task priority level * @return old value of the task priority level */ static unsigned long EFIAPI efi_raise_tpl(efi_uintn_t new_tpl) { efi_uintn_t old_tpl = efi_tpl; EFI_ENTRY("0x%zx", new_tpl); if (new_tpl < efi_tpl) debug("WARNING: new_tpl < current_tpl in %s\n", __func__); efi_tpl = new_tpl; if (efi_tpl > TPL_HIGH_LEVEL) efi_tpl = TPL_HIGH_LEVEL; EFI_EXIT(EFI_SUCCESS); return old_tpl; } /* * Lower the task priority level. * * This function implements the RestoreTpl service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @old_tpl value of the task priority level to be restored */ static void EFIAPI efi_restore_tpl(efi_uintn_t old_tpl) { EFI_ENTRY("0x%zx", old_tpl); if (old_tpl > efi_tpl) debug("WARNING: old_tpl > current_tpl in %s\n", __func__); efi_tpl = old_tpl; if (efi_tpl > TPL_HIGH_LEVEL) efi_tpl = TPL_HIGH_LEVEL; EFI_EXIT(EFI_SUCCESS); } /* * Allocate memory pages. * * This function implements the AllocatePages service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @type type of allocation to be performed * @memory_type usage type of the allocated memory * @pages number of pages to be allocated * @memory allocated memory * @return status code */ static efi_status_t EFIAPI efi_allocate_pages_ext(int type, int memory_type, efi_uintn_t pages, uint64_t *memory) { efi_status_t r; EFI_ENTRY("%d, %d, 0x%zx, %p", type, memory_type, pages, memory); r = efi_allocate_pages(type, memory_type, pages, memory); return EFI_EXIT(r); } /* * Free memory pages. * * This function implements the FreePages service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @memory start of the memory area to be freed * @pages number of pages to be freed * @return status code */ static efi_status_t EFIAPI efi_free_pages_ext(uint64_t memory, efi_uintn_t pages) { efi_status_t r; EFI_ENTRY("%"PRIx64", 0x%zx", memory, pages); r = efi_free_pages(memory, pages); return EFI_EXIT(r); } /* * Get map describing memory usage. * * This function implements the GetMemoryMap service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @memory_map_size on entry the size, in bytes, of the memory map buffer, * on exit the size of the copied memory map * @memory_map buffer to which the memory map is written * @map_key key for the memory map * @descriptor_size size of an individual memory descriptor * @descriptor_version version number of the memory descriptor structure * @return status code */ static efi_status_t EFIAPI efi_get_memory_map_ext( efi_uintn_t *memory_map_size, struct efi_mem_desc *memory_map, efi_uintn_t *map_key, efi_uintn_t *descriptor_size, uint32_t *descriptor_version) { efi_status_t r; EFI_ENTRY("%p, %p, %p, %p, %p", memory_map_size, memory_map, map_key, descriptor_size, descriptor_version); r = efi_get_memory_map(memory_map_size, memory_map, map_key, descriptor_size, descriptor_version); return EFI_EXIT(r); } /* * Allocate memory from pool. * * This function implements the AllocatePool service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @pool_type type of the pool from which memory is to be allocated * @size number of bytes to be allocated * @buffer allocated memory * @return status code */ static efi_status_t EFIAPI efi_allocate_pool_ext(int pool_type, efi_uintn_t size, void **buffer) { efi_status_t r; EFI_ENTRY("%d, %zd, %p", pool_type, size, buffer); r = efi_allocate_pool(pool_type, size, buffer); return EFI_EXIT(r); } /* * Free memory from pool. * * This function implements the FreePool service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @buffer start of memory to be freed * @return status code */ static efi_status_t EFIAPI efi_free_pool_ext(void *buffer) { efi_status_t r; EFI_ENTRY("%p", buffer); r = efi_free_pool(buffer); return EFI_EXIT(r); } /* * Create handle. * * @handle new handle * @return status code */ efi_status_t efi_create_handle(void **handle) { struct efi_object *obj; efi_status_t r; r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, sizeof(struct efi_object), (void **)&obj); if (r != EFI_SUCCESS) return r; memset(obj, 0, sizeof(struct efi_object)); obj->handle = obj; list_add_tail(&obj->link, &efi_obj_list); *handle = obj; return r; } /* * Our event capabilities are very limited. Only a small limited * number of events is allowed to coexist. */ static struct efi_event efi_events[16]; /* * Create an event. * * This function is used inside U-Boot code to create an event. * * For the API function implementing the CreateEvent service see * efi_create_event_ext. * * @type type of the event to create * @notify_tpl task priority level of the event * @notify_function notification function of the event * @notify_context pointer passed to the notification function * @event created event * @return status code */ efi_status_t efi_create_event(uint32_t type, efi_uintn_t notify_tpl, void (EFIAPI *notify_function) ( struct efi_event *event, void *context), void *notify_context, struct efi_event **event) { int i; if (event == NULL) return EFI_INVALID_PARAMETER; if ((type & EVT_NOTIFY_SIGNAL) && (type & EVT_NOTIFY_WAIT)) return EFI_INVALID_PARAMETER; if ((type & (EVT_NOTIFY_SIGNAL|EVT_NOTIFY_WAIT)) && notify_function == NULL) return EFI_INVALID_PARAMETER; for (i = 0; i < ARRAY_SIZE(efi_events); ++i) { if (efi_events[i].type) continue; efi_events[i].type = type; efi_events[i].notify_tpl = notify_tpl; efi_events[i].notify_function = notify_function; efi_events[i].notify_context = notify_context; /* Disable timers on bootup */ efi_events[i].trigger_next = -1ULL; efi_events[i].is_queued = false; efi_events[i].is_signaled = false; *event = &efi_events[i]; return EFI_SUCCESS; } return EFI_OUT_OF_RESOURCES; } /* * Create an event. * * This function implements the CreateEvent service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @type type of the event to create * @notify_tpl task priority level of the event * @notify_function notification function of the event * @notify_context pointer passed to the notification function * @event created event * @return status code */ static efi_status_t EFIAPI efi_create_event_ext( uint32_t type, efi_uintn_t notify_tpl, void (EFIAPI *notify_function) ( struct efi_event *event, void *context), void *notify_context, struct efi_event **event) { EFI_ENTRY("%d, 0x%zx, %p, %p", type, notify_tpl, notify_function, notify_context); return EFI_EXIT(efi_create_event(type, notify_tpl, notify_function, notify_context, event)); } /* * Check if a timer event has occurred or a queued notification function should * be called. * * Our timers have to work without interrupts, so we check whenever keyboard * input or disk accesses happen if enough time elapsed for them to fire. */ void efi_timer_check(void) { int i; u64 now = timer_get_us(); for (i = 0; i < ARRAY_SIZE(efi_events); ++i) { if (!efi_events[i].type) continue; if (efi_events[i].is_queued) efi_signal_event(&efi_events[i]); if (!(efi_events[i].type & EVT_TIMER) || now < efi_events[i].trigger_next) continue; switch (efi_events[i].trigger_type) { case EFI_TIMER_RELATIVE: efi_events[i].trigger_type = EFI_TIMER_STOP; break; case EFI_TIMER_PERIODIC: efi_events[i].trigger_next += efi_events[i].trigger_time; break; default: continue; } efi_events[i].is_signaled = true; efi_signal_event(&efi_events[i]); } WATCHDOG_RESET(); } /* * Set the trigger time for a timer event or stop the event. * * This is the function for internal usage in U-Boot. For the API function * implementing the SetTimer service see efi_set_timer_ext. * * @event event for which the timer is set * @type type of the timer * @trigger_time trigger period in multiples of 100ns * @return status code */ efi_status_t efi_set_timer(struct efi_event *event, enum efi_timer_delay type, uint64_t trigger_time) { int i; /* * The parameter defines a multiple of 100ns. * We use multiples of 1000ns. So divide by 10. */ do_div(trigger_time, 10); for (i = 0; i < ARRAY_SIZE(efi_events); ++i) { if (event != &efi_events[i]) continue; if (!(event->type & EVT_TIMER)) break; switch (type) { case EFI_TIMER_STOP: event->trigger_next = -1ULL; break; case EFI_TIMER_PERIODIC: case EFI_TIMER_RELATIVE: event->trigger_next = timer_get_us() + trigger_time; break; default: return EFI_INVALID_PARAMETER; } event->trigger_type = type; event->trigger_time = trigger_time; event->is_signaled = false; return EFI_SUCCESS; } return EFI_INVALID_PARAMETER; } /* * Set the trigger time for a timer event or stop the event. * * This function implements the SetTimer service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @event event for which the timer is set * @type type of the timer * @trigger_time trigger period in multiples of 100ns * @return status code */ static efi_status_t EFIAPI efi_set_timer_ext(struct efi_event *event, enum efi_timer_delay type, uint64_t trigger_time) { EFI_ENTRY("%p, %d, %"PRIx64, event, type, trigger_time); return EFI_EXIT(efi_set_timer(event, type, trigger_time)); } /* * Wait for events to be signaled. * * This function implements the WaitForEvent service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @num_events number of events to be waited for * @events events to be waited for * @index index of the event that was signaled * @return status code */ static efi_status_t EFIAPI efi_wait_for_event(efi_uintn_t num_events, struct efi_event **event, efi_uintn_t *index) { int i, j; EFI_ENTRY("%zd, %p, %p", num_events, event, index); /* Check parameters */ if (!num_events || !event) return EFI_EXIT(EFI_INVALID_PARAMETER); /* Check TPL */ if (efi_tpl != TPL_APPLICATION) return EFI_EXIT(EFI_UNSUPPORTED); for (i = 0; i < num_events; ++i) { for (j = 0; j < ARRAY_SIZE(efi_events); ++j) { if (event[i] == &efi_events[j]) goto known_event; } return EFI_EXIT(EFI_INVALID_PARAMETER); known_event: if (!event[i]->type || event[i]->type & EVT_NOTIFY_SIGNAL) return EFI_EXIT(EFI_INVALID_PARAMETER); if (!event[i]->is_signaled) efi_signal_event(event[i]); } /* Wait for signal */ for (;;) { for (i = 0; i < num_events; ++i) { if (event[i]->is_signaled) goto out; } /* Allow events to occur. */ efi_timer_check(); } out: /* * Reset the signal which is passed to the caller to allow periodic * events to occur. */ event[i]->is_signaled = false; if (index) *index = i; return EFI_EXIT(EFI_SUCCESS); } /* * Signal an EFI event. * * This function implements the SignalEvent service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * This functions sets the signaled state of the event and queues the * notification function for execution. * * @event event to signal * @return status code */ static efi_status_t EFIAPI efi_signal_event_ext(struct efi_event *event) { int i; EFI_ENTRY("%p", event); for (i = 0; i < ARRAY_SIZE(efi_events); ++i) { if (event != &efi_events[i]) continue; if (event->is_signaled) break; event->is_signaled = true; if (event->type & EVT_NOTIFY_SIGNAL) efi_signal_event(event); break; } return EFI_EXIT(EFI_SUCCESS); } /* * Close an EFI event. * * This function implements the CloseEvent service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @event event to close * @return status code */ static efi_status_t EFIAPI efi_close_event(struct efi_event *event) { int i; EFI_ENTRY("%p", event); for (i = 0; i < ARRAY_SIZE(efi_events); ++i) { if (event == &efi_events[i]) { event->type = 0; event->trigger_next = -1ULL; event->is_queued = false; event->is_signaled = false; return EFI_EXIT(EFI_SUCCESS); } } return EFI_EXIT(EFI_INVALID_PARAMETER); } /* * Check if an event is signaled. * * This function implements the CheckEvent service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * If an event is not signaled yet the notification function is queued. * * @event event to check * @return status code */ static efi_status_t EFIAPI efi_check_event(struct efi_event *event) { int i; EFI_ENTRY("%p", event); efi_timer_check(); for (i = 0; i < ARRAY_SIZE(efi_events); ++i) { if (event != &efi_events[i]) continue; if (!event->type || event->type & EVT_NOTIFY_SIGNAL) break; if (!event->is_signaled) efi_signal_event(event); if (event->is_signaled) return EFI_EXIT(EFI_SUCCESS); return EFI_EXIT(EFI_NOT_READY); } return EFI_EXIT(EFI_INVALID_PARAMETER); } /* * Find the internal EFI object for a handle. * * @handle handle to find * @return EFI object */ struct efi_object *efi_search_obj(const void *handle) { struct efi_object *efiobj; list_for_each_entry(efiobj, &efi_obj_list, link) { if (efiobj->handle == handle) return efiobj; } return NULL; } /* * Find a protocol on a handle. * * @handle handle * @protocol_guid GUID of the protocol * @handler reference to the protocol * @return status code */ efi_status_t efi_search_protocol(const void *handle, const efi_guid_t *protocol_guid, struct efi_handler **handler) { struct efi_object *efiobj; size_t i; struct efi_handler *protocol; if (!handle || !protocol_guid) return EFI_INVALID_PARAMETER; efiobj = efi_search_obj(handle); if (!efiobj) return EFI_INVALID_PARAMETER; for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) { protocol = &efiobj->protocols[i]; if (!protocol->guid) continue; if (!guidcmp(protocol->guid, protocol_guid)) { if (handler) *handler = protocol; return EFI_SUCCESS; } } return EFI_NOT_FOUND; } /* * Install new protocol on a handle. * * @handle handle on which the protocol shall be installed * @protocol GUID of the protocol to be installed * @protocol_interface interface of the protocol implementation * @return status code */ efi_status_t efi_add_protocol(const void *handle, const efi_guid_t *protocol, void *protocol_interface) { struct efi_object *efiobj; struct efi_handler *handler; efi_status_t ret; size_t i; efiobj = efi_search_obj(handle); if (!efiobj) return EFI_INVALID_PARAMETER; ret = efi_search_protocol(handle, protocol, NULL); if (ret != EFI_NOT_FOUND) return EFI_INVALID_PARAMETER; handler = calloc(1, sizeof(struct efi_handler)); if (!handler) return EFI_OUT_OF_RESOURCES; /* Install protocol in first empty slot. */ for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) { handler = &efiobj->protocols[i]; if (handler->guid) continue; handler->guid = protocol; handler->protocol_interface = protocol_interface; return EFI_SUCCESS; } return EFI_OUT_OF_RESOURCES; } /* * Delete protocol from a handle. * * @handle handle from which the protocol shall be deleted * @protocol GUID of the protocol to be deleted * @protocol_interface interface of the protocol implementation * @return status code */ efi_status_t efi_remove_protocol(const void *handle, const efi_guid_t *protocol, void *protocol_interface) { struct efi_handler *handler; efi_status_t ret; ret = efi_search_protocol(handle, protocol, &handler); if (ret != EFI_SUCCESS) return ret; if (handler->protocol_interface != protocol_interface) return EFI_NOT_FOUND; handler->guid = NULL; handler->protocol_interface = NULL; return EFI_SUCCESS; } /* * Delete all protocols from a handle. * * @handle handle from which the protocols shall be deleted * @return status code */ efi_status_t efi_remove_all_protocols(const void *handle) { struct efi_object *efiobj; struct efi_handler *handler; size_t i; efiobj = efi_search_obj(handle); if (!efiobj) return EFI_INVALID_PARAMETER; for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) { handler = &efiobj->protocols[i]; handler->guid = NULL; handler->protocol_interface = NULL; } return EFI_SUCCESS; } /* * Install protocol interface. * * This function implements the InstallProtocolInterface service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @handle handle on which the protocol shall be installed * @protocol GUID of the protocol to be installed * @protocol_interface_type type of the interface to be installed, * always EFI_NATIVE_INTERFACE * @protocol_interface interface of the protocol implementation * @return status code */ static efi_status_t EFIAPI efi_install_protocol_interface( void **handle, const efi_guid_t *protocol, int protocol_interface_type, void *protocol_interface) { efi_status_t r; EFI_ENTRY("%p, %pUl, %d, %p", handle, protocol, protocol_interface_type, protocol_interface); if (!handle || !protocol || protocol_interface_type != EFI_NATIVE_INTERFACE) { r = EFI_INVALID_PARAMETER; goto out; } /* Create new handle if requested. */ if (!*handle) { r = efi_create_handle(handle); if (r != EFI_SUCCESS) goto out; debug("%sEFI: new handle %p\n", indent_string(nesting_level), *handle); } else { debug("%sEFI: handle %p\n", indent_string(nesting_level), *handle); } /* Add new protocol */ r = efi_add_protocol(*handle, protocol, protocol_interface); out: return EFI_EXIT(r); } /* * Reinstall protocol interface. * * This function implements the ReinstallProtocolInterface service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @handle handle on which the protocol shall be * reinstalled * @protocol GUID of the protocol to be installed * @old_interface interface to be removed * @new_interface interface to be installed * @return status code */ static efi_status_t EFIAPI efi_reinstall_protocol_interface(void *handle, const efi_guid_t *protocol, void *old_interface, void *new_interface) { EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, old_interface, new_interface); return EFI_EXIT(EFI_ACCESS_DENIED); } /* * Uninstall protocol interface. * * This function implements the UninstallProtocolInterface service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @handle handle from which the protocol shall be removed * @protocol GUID of the protocol to be removed * @protocol_interface interface to be removed * @return status code */ static efi_status_t EFIAPI efi_uninstall_protocol_interface( void *handle, const efi_guid_t *protocol, void *protocol_interface) { struct efi_handler *handler; efi_status_t r; EFI_ENTRY("%p, %pUl, %p", handle, protocol, protocol_interface); if (!handle || !protocol) { r = EFI_INVALID_PARAMETER; goto out; } /* Find the protocol on the handle */ r = efi_search_protocol(handle, protocol, &handler); if (r != EFI_SUCCESS) goto out; if (handler->protocol_interface) { /* TODO disconnect controllers */ r = EFI_ACCESS_DENIED; } else { r = efi_remove_protocol(handle, protocol, protocol_interface); } out: return EFI_EXIT(r); } /* * Register an event for notification when a protocol is installed. * * This function implements the RegisterProtocolNotify service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @protocol GUID of the protocol whose installation shall be * notified * @event event to be signaled upon installation of the protocol * @registration key for retrieving the registration information * @return status code */ static efi_status_t EFIAPI efi_register_protocol_notify( const efi_guid_t *protocol, struct efi_event *event, void **registration) { EFI_ENTRY("%pUl, %p, %p", protocol, event, registration); return EFI_EXIT(EFI_OUT_OF_RESOURCES); } /* * Determine if an EFI handle implements a protocol. * * See the documentation of the LocateHandle service in the UEFI specification. * * @search_type selection criterion * @protocol GUID of the protocol * @search_key registration key * @efiobj handle * @return 0 if the handle implements the protocol */ static int efi_search(enum efi_locate_search_type search_type, const efi_guid_t *protocol, void *search_key, struct efi_object *efiobj) { efi_status_t ret; switch (search_type) { case ALL_HANDLES: return 0; case BY_REGISTER_NOTIFY: /* TODO: RegisterProtocolNotify is not implemented yet */ return -1; case BY_PROTOCOL: ret = efi_search_protocol(efiobj->handle, protocol, NULL); return (ret != EFI_SUCCESS); default: /* Invalid search type */ return -1; } } /* * Locate handles implementing a protocol. * * This function is meant for U-Boot internal calls. For the API implementation * of the LocateHandle service see efi_locate_handle_ext. * * @search_type selection criterion * @protocol GUID of the protocol * @search_key registration key * @buffer_size size of the buffer to receive the handles in bytes * @buffer buffer to receive the relevant handles * @return status code */ static efi_status_t efi_locate_handle( enum efi_locate_search_type search_type, const efi_guid_t *protocol, void *search_key, efi_uintn_t *buffer_size, efi_handle_t *buffer) { struct efi_object *efiobj; efi_uintn_t size = 0; /* Check parameters */ switch (search_type) { case ALL_HANDLES: break; case BY_REGISTER_NOTIFY: if (!search_key) return EFI_INVALID_PARAMETER; /* RegisterProtocolNotify is not implemented yet */ return EFI_UNSUPPORTED; case BY_PROTOCOL: if (!protocol) return EFI_INVALID_PARAMETER; break; default: return EFI_INVALID_PARAMETER; } /* * efi_locate_handle_buffer uses this function for * the calculation of the necessary buffer size. * So do not require a buffer for buffersize == 0. */ if (!buffer_size || (*buffer_size && !buffer)) return EFI_INVALID_PARAMETER; /* Count how much space we need */ list_for_each_entry(efiobj, &efi_obj_list, link) { if (!efi_search(search_type, protocol, search_key, efiobj)) size += sizeof(void*); } if (*buffer_size < size) { *buffer_size = size; return EFI_BUFFER_TOO_SMALL; } *buffer_size = size; if (size == 0) return EFI_NOT_FOUND; /* Then fill the array */ list_for_each_entry(efiobj, &efi_obj_list, link) { if (!efi_search(search_type, protocol, search_key, efiobj)) *buffer++ = efiobj->handle; } return EFI_SUCCESS; } /* * Locate handles implementing a protocol. * * This function implements the LocateHandle service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @search_type selection criterion * @protocol GUID of the protocol * @search_key registration key * @buffer_size size of the buffer to receive the handles in bytes * @buffer buffer to receive the relevant handles * @return 0 if the handle implements the protocol */ static efi_status_t EFIAPI efi_locate_handle_ext( enum efi_locate_search_type search_type, const efi_guid_t *protocol, void *search_key, efi_uintn_t *buffer_size, efi_handle_t *buffer) { EFI_ENTRY("%d, %pUl, %p, %p, %p", search_type, protocol, search_key, buffer_size, buffer); return EFI_EXIT(efi_locate_handle(search_type, protocol, search_key, buffer_size, buffer)); } /* Collapses configuration table entries, removing index i */ static void efi_remove_configuration_table(int i) { struct efi_configuration_table *this = &efi_conf_table[i]; struct efi_configuration_table *next = &efi_conf_table[i+1]; struct efi_configuration_table *end = &efi_conf_table[systab.nr_tables]; memmove(this, next, (ulong)end - (ulong)next); systab.nr_tables--; } /* * Adds, updates, or removes a configuration table. * * This function is used for internal calls. For the API implementation of the * InstallConfigurationTable service see efi_install_configuration_table_ext. * * @guid GUID of the installed table * @table table to be installed * @return status code */ efi_status_t efi_install_configuration_table(const efi_guid_t *guid, void *table) { int i; /* Check for guid override */ for (i = 0; i < systab.nr_tables; i++) { if (!guidcmp(guid, &efi_conf_table[i].guid)) { if (table) efi_conf_table[i].table = table; else efi_remove_configuration_table(i); return EFI_SUCCESS; } } if (!table) return EFI_NOT_FOUND; /* No override, check for overflow */ if (i >= ARRAY_SIZE(efi_conf_table)) return EFI_OUT_OF_RESOURCES; /* Add a new entry */ memcpy(&efi_conf_table[i].guid, guid, sizeof(*guid)); efi_conf_table[i].table = table; systab.nr_tables = i + 1; return EFI_SUCCESS; } /* * Adds, updates, or removes a configuration table. * * This function implements the InstallConfigurationTable service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @guid GUID of the installed table * @table table to be installed * @return status code */ static efi_status_t EFIAPI efi_install_configuration_table_ext(efi_guid_t *guid, void *table) { EFI_ENTRY("%pUl, %p", guid, table); return EFI_EXIT(efi_install_configuration_table(guid, table)); } /* * Initialize a loaded_image_info + loaded_image_info object with correct * protocols, boot-device, etc. * * @info loaded image info to be passed to the entry point of the * image * @obj internal object associated with the loaded image * @device_path device path of the loaded image * @file_path file path of the loaded image */ void efi_setup_loaded_image(struct efi_loaded_image *info, struct efi_object *obj, struct efi_device_path *device_path, struct efi_device_path *file_path) { efi_status_t ret; obj->handle = info; info->file_path = file_path; if (device_path) info->device_handle = efi_dp_find_obj(device_path, NULL); list_add_tail(&obj->link, &efi_obj_list); /* * When asking for the device path interface, return * bootefi_device_path */ ret = efi_add_protocol(obj->handle, &efi_guid_device_path, device_path); if (ret != EFI_SUCCESS) goto failure; /* * When asking for the loaded_image interface, just * return handle which points to loaded_image_info */ ret = efi_add_protocol(obj->handle, &efi_guid_loaded_image, info); if (ret != EFI_SUCCESS) goto failure; ret = efi_add_protocol(obj->handle, &efi_guid_console_control, (void *)&efi_console_control); if (ret != EFI_SUCCESS) goto failure; ret = efi_add_protocol(obj->handle, &efi_guid_device_path_to_text_protocol, (void *)&efi_device_path_to_text); if (ret != EFI_SUCCESS) goto failure; return; failure: printf("ERROR: Failure to install protocols for loaded image\n"); } /* * Load an image using a file path. * * @file_path the path of the image to load * @buffer buffer containing the loaded image * @return status code */ efi_status_t efi_load_image_from_path(struct efi_device_path *file_path, void **buffer) { struct efi_file_info *info = NULL; struct efi_file_handle *f; static efi_status_t ret; uint64_t bs; f = efi_file_from_path(file_path); if (!f) return EFI_DEVICE_ERROR; bs = 0; EFI_CALL(ret = f->getinfo(f, (efi_guid_t *)&efi_file_info_guid, &bs, info)); if (ret == EFI_BUFFER_TOO_SMALL) { info = malloc(bs); EFI_CALL(ret = f->getinfo(f, (efi_guid_t *)&efi_file_info_guid, &bs, info)); } if (ret != EFI_SUCCESS) goto error; ret = efi_allocate_pool(EFI_LOADER_DATA, info->file_size, buffer); if (ret) goto error; EFI_CALL(ret = f->read(f, &info->file_size, *buffer)); error: free(info); EFI_CALL(f->close(f)); if (ret != EFI_SUCCESS) { efi_free_pool(*buffer); *buffer = NULL; } return ret; } /* * Load an EFI image into memory. * * This function implements the LoadImage service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @boot_policy true for request originating from the boot manager * @parent_image the calles's image handle * @file_path the path of the image to load * @source_buffer memory location from which the image is installed * @source_size size of the memory area from which the image is * installed * @image_handle handle for the newly installed image * @return status code */ static efi_status_t EFIAPI efi_load_image(bool boot_policy, efi_handle_t parent_image, struct efi_device_path *file_path, void *source_buffer, unsigned long source_size, efi_handle_t *image_handle) { struct efi_loaded_image *info; struct efi_object *obj; EFI_ENTRY("%d, %p, %p, %p, %ld, %p", boot_policy, parent_image, file_path, source_buffer, source_size, image_handle); info = calloc(1, sizeof(*info)); obj = calloc(1, sizeof(*obj)); if (!source_buffer) { struct efi_device_path *dp, *fp; efi_status_t ret; ret = efi_load_image_from_path(file_path, &source_buffer); if (ret != EFI_SUCCESS) { free(info); free(obj); return EFI_EXIT(ret); } /* * split file_path which contains both the device and * file parts: */ efi_dp_split_file_path(file_path, &dp, &fp); efi_setup_loaded_image(info, obj, dp, fp); } else { /* In this case, file_path is the "device" path, ie. * something like a HARDWARE_DEVICE:MEMORY_MAPPED */ efi_setup_loaded_image(info, obj, file_path, NULL); } info->reserved = efi_load_pe(source_buffer, info); if (!info->reserved) { free(info); free(obj); return EFI_EXIT(EFI_UNSUPPORTED); } info->system_table = &systab; info->parent_handle = parent_image; *image_handle = info; return EFI_EXIT(EFI_SUCCESS); } /* * Call the entry point of an image. * * This function implements the StartImage service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @image_handle handle of the image * @exit_data_size size of the buffer * @exit_data buffer to receive the exit data of the called image * @return status code */ static efi_status_t EFIAPI efi_start_image(efi_handle_t image_handle, unsigned long *exit_data_size, s16 **exit_data) { ulong (*entry)(void *image_handle, struct efi_system_table *st); struct efi_loaded_image *info = image_handle; EFI_ENTRY("%p, %p, %p", image_handle, exit_data_size, exit_data); entry = info->reserved; efi_is_direct_boot = false; /* call the image! */ if (setjmp(&info->exit_jmp)) { /* We returned from the child image */ return EFI_EXIT(info->exit_status); } __efi_nesting_dec(); __efi_exit_check(); entry(image_handle, &systab); __efi_entry_check(); __efi_nesting_inc(); /* Should usually never get here */ return EFI_EXIT(EFI_SUCCESS); } /* * Leave an EFI application or driver. * * This function implements the Exit service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @image_handle handle of the application or driver that is exiting * @exit_status status code * @exit_data_size size of the buffer in bytes * @exit_data buffer with data describing an error * @return status code */ static efi_status_t EFIAPI efi_exit(efi_handle_t image_handle, efi_status_t exit_status, unsigned long exit_data_size, int16_t *exit_data) { struct efi_loaded_image *loaded_image_info = (void*)image_handle; EFI_ENTRY("%p, %ld, %ld, %p", image_handle, exit_status, exit_data_size, exit_data); /* Make sure entry/exit counts for EFI world cross-overs match */ __efi_exit_check(); /* * But longjmp out with the U-Boot gd, not the application's, as * the other end is a setjmp call inside EFI context. */ efi_restore_gd(); loaded_image_info->exit_status = exit_status; longjmp(&loaded_image_info->exit_jmp, 1); panic("EFI application exited"); } /* * Unload an EFI image. * * This function implements the UnloadImage service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @image_handle handle of the image to be unloaded * @return status code */ static efi_status_t EFIAPI efi_unload_image(void *image_handle) { struct efi_object *efiobj; EFI_ENTRY("%p", image_handle); efiobj = efi_search_obj(image_handle); if (efiobj) list_del(&efiobj->link); return EFI_EXIT(EFI_SUCCESS); } /* * Fix up caches for EFI payloads if necessary. */ static void efi_exit_caches(void) { #if defined(CONFIG_ARM) && !defined(CONFIG_ARM64) /* * Grub on 32bit ARM needs to have caches disabled before jumping into * a zImage, but does not know of all cache layers. Give it a hand. */ if (efi_is_direct_boot) cleanup_before_linux(); #endif } /* * Stop boot services. * * This function implements the ExitBootServices service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @image_handle handle of the loaded image * @map_key key of the memory map * @return status code */ static efi_status_t EFIAPI efi_exit_boot_services(void *image_handle, unsigned long map_key) { int i; EFI_ENTRY("%p, %ld", image_handle, map_key); /* Notify that ExitBootServices is invoked. */ for (i = 0; i < ARRAY_SIZE(efi_events); ++i) { if (efi_events[i].type != EVT_SIGNAL_EXIT_BOOT_SERVICES) continue; efi_signal_event(&efi_events[i]); } /* Make sure that notification functions are not called anymore */ efi_tpl = TPL_HIGH_LEVEL; /* XXX Should persist EFI variables here */ board_quiesce_devices(); /* Fix up caches for EFI payloads if necessary */ efi_exit_caches(); /* This stops all lingering devices */ bootm_disable_interrupts(); /* Give the payload some time to boot */ efi_set_watchdog(0); WATCHDOG_RESET(); return EFI_EXIT(EFI_SUCCESS); } /* * Get next value of the counter. * * This function implements the NextMonotonicCount service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @count returned value of the counter * @return status code */ static efi_status_t EFIAPI efi_get_next_monotonic_count(uint64_t *count) { static uint64_t mono = 0; EFI_ENTRY("%p", count); *count = mono++; return EFI_EXIT(EFI_SUCCESS); } /* * Sleep. * * This function implements the Stall sercive. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @microseconds period to sleep in microseconds * @return status code */ static efi_status_t EFIAPI efi_stall(unsigned long microseconds) { EFI_ENTRY("%ld", microseconds); udelay(microseconds); return EFI_EXIT(EFI_SUCCESS); } /* * Reset the watchdog timer. * * This function implements the SetWatchdogTimer service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @timeout seconds before reset by watchdog * @watchdog_code code to be logged when resetting * @data_size size of buffer in bytes * @watchdog_data buffer with data describing the reset reason * @return status code */ static efi_status_t EFIAPI efi_set_watchdog_timer(unsigned long timeout, uint64_t watchdog_code, unsigned long data_size, uint16_t *watchdog_data) { EFI_ENTRY("%ld, 0x%"PRIx64", %ld, %p", timeout, watchdog_code, data_size, watchdog_data); return EFI_EXIT(efi_set_watchdog(timeout)); } /* * Connect a controller to a driver. * * This function implements the ConnectController service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @controller_handle handle of the controller * @driver_image_handle handle of the driver * @remain_device_path device path of a child controller * @recursive true to connect all child controllers * @return status code */ static efi_status_t EFIAPI efi_connect_controller( efi_handle_t controller_handle, efi_handle_t *driver_image_handle, struct efi_device_path *remain_device_path, bool recursive) { EFI_ENTRY("%p, %p, %p, %d", controller_handle, driver_image_handle, remain_device_path, recursive); return EFI_EXIT(EFI_NOT_FOUND); } /* * Disconnect a controller from a driver. * * This function implements the DisconnectController service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @controller_handle handle of the controller * @driver_image_handle handle of the driver * @child_handle handle of the child to destroy * @return status code */ static efi_status_t EFIAPI efi_disconnect_controller(void *controller_handle, void *driver_image_handle, void *child_handle) { EFI_ENTRY("%p, %p, %p", controller_handle, driver_image_handle, child_handle); return EFI_EXIT(EFI_INVALID_PARAMETER); } /* * Close a protocol. * * This function implements the CloseProtocol service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @handle handle on which the protocol shall be closed * @protocol GUID of the protocol to close * @agent_handle handle of the driver * @controller_handle handle of the controller * @return status code */ static efi_status_t EFIAPI efi_close_protocol(void *handle, const efi_guid_t *protocol, void *agent_handle, void *controller_handle) { EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, agent_handle, controller_handle); return EFI_EXIT(EFI_NOT_FOUND); } /* * Provide information about then open status of a protocol on a handle * * This function implements the OpenProtocolInformation service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @handle handle for which the information shall be retrieved * @protocol GUID of the protocol * @entry_buffer buffer to receive the open protocol information * @entry_count number of entries available in the buffer * @return status code */ static efi_status_t EFIAPI efi_open_protocol_information(efi_handle_t handle, const efi_guid_t *protocol, struct efi_open_protocol_info_entry **entry_buffer, efi_uintn_t *entry_count) { EFI_ENTRY("%p, %pUl, %p, %p", handle, protocol, entry_buffer, entry_count); return EFI_EXIT(EFI_NOT_FOUND); } /* * Get protocols installed on a handle. * * This function implements the ProtocolsPerHandleService. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @handle handle for which the information is retrieved * @protocol_buffer buffer with protocol GUIDs * @protocol_buffer_count number of entries in the buffer * @return status code */ static efi_status_t EFIAPI efi_protocols_per_handle(void *handle, efi_guid_t ***protocol_buffer, efi_uintn_t *protocol_buffer_count) { unsigned long buffer_size; struct efi_object *efiobj; unsigned long i, j; struct list_head *lhandle; efi_status_t r; EFI_ENTRY("%p, %p, %p", handle, protocol_buffer, protocol_buffer_count); if (!handle || !protocol_buffer || !protocol_buffer_count) return EFI_EXIT(EFI_INVALID_PARAMETER); *protocol_buffer = NULL; *protocol_buffer_count = 0; list_for_each(lhandle, &efi_obj_list) { efiobj = list_entry(lhandle, struct efi_object, link); if (efiobj->handle != handle) continue; /* Count protocols */ for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) { if (efiobj->protocols[i].guid) ++*protocol_buffer_count; } /* Copy guids */ if (*protocol_buffer_count) { buffer_size = sizeof(efi_guid_t *) * *protocol_buffer_count; r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, buffer_size, (void **)protocol_buffer); if (r != EFI_SUCCESS) return EFI_EXIT(r); j = 0; for (i = 0; i < ARRAY_SIZE(efiobj->protocols); ++i) { if (efiobj->protocols[i].guid) { (*protocol_buffer)[j] = (void *) efiobj->protocols[i].guid; ++j; } } } break; } return EFI_EXIT(EFI_SUCCESS); } /* * Locate handles implementing a protocol. * * This function implements the LocateHandleBuffer service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @search_type selection criterion * @protocol GUID of the protocol * @search_key registration key * @no_handles number of returned handles * @buffer buffer with the returned handles * @return status code */ static efi_status_t EFIAPI efi_locate_handle_buffer( enum efi_locate_search_type search_type, const efi_guid_t *protocol, void *search_key, efi_uintn_t *no_handles, efi_handle_t **buffer) { efi_status_t r; efi_uintn_t buffer_size = 0; EFI_ENTRY("%d, %pUl, %p, %p, %p", search_type, protocol, search_key, no_handles, buffer); if (!no_handles || !buffer) { r = EFI_INVALID_PARAMETER; goto out; } *no_handles = 0; *buffer = NULL; r = efi_locate_handle(search_type, protocol, search_key, &buffer_size, *buffer); if (r != EFI_BUFFER_TOO_SMALL) goto out; r = efi_allocate_pool(EFI_ALLOCATE_ANY_PAGES, buffer_size, (void **)buffer); if (r != EFI_SUCCESS) goto out; r = efi_locate_handle(search_type, protocol, search_key, &buffer_size, *buffer); if (r == EFI_SUCCESS) *no_handles = buffer_size / sizeof(void *); out: return EFI_EXIT(r); } /* * Find an interface implementing a protocol. * * This function implements the LocateProtocol service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @protocol GUID of the protocol * @registration registration key passed to the notification function * @protocol_interface interface implementing the protocol * @return status code */ static efi_status_t EFIAPI efi_locate_protocol(const efi_guid_t *protocol, void *registration, void **protocol_interface) { struct list_head *lhandle; efi_status_t ret; EFI_ENTRY("%pUl, %p, %p", protocol, registration, protocol_interface); if (!protocol || !protocol_interface) return EFI_EXIT(EFI_INVALID_PARAMETER); list_for_each(lhandle, &efi_obj_list) { struct efi_object *efiobj; struct efi_handler *handler; efiobj = list_entry(lhandle, struct efi_object, link); ret = efi_search_protocol(efiobj->handle, protocol, &handler); if (ret == EFI_SUCCESS) { *protocol_interface = handler->protocol_interface; return EFI_EXIT(EFI_SUCCESS); } } *protocol_interface = NULL; return EFI_EXIT(EFI_NOT_FOUND); } /* * Get the device path and handle of an device implementing a protocol. * * This function implements the LocateDevicePath service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @protocol GUID of the protocol * @device_path device path * @device handle of the device * @return status code */ static efi_status_t EFIAPI efi_locate_device_path( const efi_guid_t *protocol, struct efi_device_path **device_path, efi_handle_t *device) { struct efi_device_path *dp; size_t i; struct efi_handler *handler; efi_handle_t *handles; size_t len, len_dp; size_t len_best = 0; efi_uintn_t no_handles; u8 *remainder; efi_status_t ret; EFI_ENTRY("%pUl, %p, %p", protocol, device_path, device); if (!protocol || !device_path || !*device_path || !device) { ret = EFI_INVALID_PARAMETER; goto out; } /* Find end of device path */ len = efi_dp_size(*device_path); /* Get all handles implementing the protocol */ ret = EFI_CALL(efi_locate_handle_buffer(BY_PROTOCOL, protocol, NULL, &no_handles, &handles)); if (ret != EFI_SUCCESS) goto out; for (i = 0; i < no_handles; ++i) { /* Find the device path protocol */ ret = efi_search_protocol(handles[i], &efi_guid_device_path, &handler); if (ret != EFI_SUCCESS) continue; dp = (struct efi_device_path *)handler->protocol_interface; len_dp = efi_dp_size(dp); /* * This handle can only be a better fit * if its device path length is longer than the best fit and * if its device path length is shorter of equal the searched * device path. */ if (len_dp <= len_best || len_dp > len) continue; /* Check if dp is a subpath of device_path */ if (memcmp(*device_path, dp, len_dp)) continue; *device = handles[i]; len_best = len_dp; } if (len_best) { remainder = (u8 *)*device_path + len_best; *device_path = (struct efi_device_path *)remainder; ret = EFI_SUCCESS; } else { ret = EFI_NOT_FOUND; } out: return EFI_EXIT(ret); } /* * Install multiple protocol interfaces. * * This function implements the MultipleProtocolInterfaces service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @handle handle on which the protocol interfaces shall be installed * @... NULL terminated argument list with pairs of protocol GUIDS and * interfaces * @return status code */ static efi_status_t EFIAPI efi_install_multiple_protocol_interfaces( void **handle, ...) { EFI_ENTRY("%p", handle); va_list argptr; const efi_guid_t *protocol; void *protocol_interface; efi_status_t r = EFI_SUCCESS; int i = 0; if (!handle) return EFI_EXIT(EFI_INVALID_PARAMETER); va_start(argptr, handle); for (;;) { protocol = va_arg(argptr, efi_guid_t*); if (!protocol) break; protocol_interface = va_arg(argptr, void*); r = EFI_CALL(efi_install_protocol_interface( handle, protocol, EFI_NATIVE_INTERFACE, protocol_interface)); if (r != EFI_SUCCESS) break; i++; } va_end(argptr); if (r == EFI_SUCCESS) return EFI_EXIT(r); /* If an error occurred undo all changes. */ va_start(argptr, handle); for (; i; --i) { protocol = va_arg(argptr, efi_guid_t*); protocol_interface = va_arg(argptr, void*); EFI_CALL(efi_uninstall_protocol_interface(handle, protocol, protocol_interface)); } va_end(argptr); return EFI_EXIT(r); } /* * Uninstall multiple protocol interfaces. * * This function implements the UninstallMultipleProtocolInterfaces service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @handle handle from which the protocol interfaces shall be removed * @... NULL terminated argument list with pairs of protocol GUIDS and * interfaces * @return status code */ static efi_status_t EFIAPI efi_uninstall_multiple_protocol_interfaces( void *handle, ...) { EFI_ENTRY("%p", handle); va_list argptr; const efi_guid_t *protocol; void *protocol_interface; efi_status_t r = EFI_SUCCESS; size_t i = 0; if (!handle) return EFI_EXIT(EFI_INVALID_PARAMETER); va_start(argptr, handle); for (;;) { protocol = va_arg(argptr, efi_guid_t*); if (!protocol) break; protocol_interface = va_arg(argptr, void*); r = EFI_CALL(efi_uninstall_protocol_interface( handle, protocol, protocol_interface)); if (r != EFI_SUCCESS) break; i++; } va_end(argptr); if (r == EFI_SUCCESS) return EFI_EXIT(r); /* If an error occurred undo all changes. */ va_start(argptr, handle); for (; i; --i) { protocol = va_arg(argptr, efi_guid_t*); protocol_interface = va_arg(argptr, void*); EFI_CALL(efi_install_protocol_interface(&handle, protocol, EFI_NATIVE_INTERFACE, protocol_interface)); } va_end(argptr); return EFI_EXIT(r); } /* * Calculate cyclic redundancy code. * * This function implements the CalculateCrc32 service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @data buffer with data * @data_size size of buffer in bytes * @crc32_p cyclic redundancy code * @return status code */ static efi_status_t EFIAPI efi_calculate_crc32(void *data, unsigned long data_size, uint32_t *crc32_p) { EFI_ENTRY("%p, %ld", data, data_size); *crc32_p = crc32(0, data, data_size); return EFI_EXIT(EFI_SUCCESS); } /* * Copy memory. * * This function implements the CopyMem service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @destination destination of the copy operation * @source source of the copy operation * @length number of bytes to copy */ static void EFIAPI efi_copy_mem(void *destination, const void *source, size_t length) { EFI_ENTRY("%p, %p, %ld", destination, source, (unsigned long)length); memcpy(destination, source, length); EFI_EXIT(EFI_SUCCESS); } /* * Fill memory with a byte value. * * This function implements the SetMem service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @buffer buffer to fill * @size size of buffer in bytes * @value byte to copy to the buffer */ static void EFIAPI efi_set_mem(void *buffer, size_t size, uint8_t value) { EFI_ENTRY("%p, %ld, 0x%x", buffer, (unsigned long)size, value); memset(buffer, value, size); EFI_EXIT(EFI_SUCCESS); } /* * Open protocol interface on a handle. * * This function implements the OpenProtocol interface. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @handle handle on which the protocol shall be opened * @protocol GUID of the protocol * @protocol_interface interface implementing the protocol * @agent_handle handle of the driver * @controller_handle handle of the controller * @attributes attributes indicating how to open the protocol * @return status code */ static efi_status_t EFIAPI efi_open_protocol( void *handle, const efi_guid_t *protocol, void **protocol_interface, void *agent_handle, void *controller_handle, uint32_t attributes) { struct efi_handler *handler; efi_status_t r = EFI_INVALID_PARAMETER; EFI_ENTRY("%p, %pUl, %p, %p, %p, 0x%x", handle, protocol, protocol_interface, agent_handle, controller_handle, attributes); if (!handle || !protocol || (!protocol_interface && attributes != EFI_OPEN_PROTOCOL_TEST_PROTOCOL)) { goto out; } switch (attributes) { case EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL: case EFI_OPEN_PROTOCOL_GET_PROTOCOL: case EFI_OPEN_PROTOCOL_TEST_PROTOCOL: break; case EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER: if (controller_handle == handle) goto out; case EFI_OPEN_PROTOCOL_BY_DRIVER: case EFI_OPEN_PROTOCOL_BY_DRIVER | EFI_OPEN_PROTOCOL_EXCLUSIVE: if (controller_handle == NULL) goto out; case EFI_OPEN_PROTOCOL_EXCLUSIVE: if (agent_handle == NULL) goto out; break; default: goto out; } r = efi_search_protocol(handle, protocol, &handler); if (r != EFI_SUCCESS) goto out; if (attributes != EFI_OPEN_PROTOCOL_TEST_PROTOCOL) *protocol_interface = handler->protocol_interface; out: return EFI_EXIT(r); } /* * Get interface of a protocol on a handle. * * This function implements the HandleProtocol service. * See the Unified Extensible Firmware Interface (UEFI) specification * for details. * * @handle handle on which the protocol shall be opened * @protocol GUID of the protocol * @protocol_interface interface implementing the protocol * @return status code */ static efi_status_t EFIAPI efi_handle_protocol(void *handle, const efi_guid_t *protocol, void **protocol_interface) { return efi_open_protocol(handle, protocol, protocol_interface, NULL, NULL, EFI_OPEN_PROTOCOL_BY_HANDLE_PROTOCOL); } static const struct efi_boot_services efi_boot_services = { .hdr = { .headersize = sizeof(struct efi_table_hdr), }, .raise_tpl = efi_raise_tpl, .restore_tpl = efi_restore_tpl, .allocate_pages = efi_allocate_pages_ext, .free_pages = efi_free_pages_ext, .get_memory_map = efi_get_memory_map_ext, .allocate_pool = efi_allocate_pool_ext, .free_pool = efi_free_pool_ext, .create_event = efi_create_event_ext, .set_timer = efi_set_timer_ext, .wait_for_event = efi_wait_for_event, .signal_event = efi_signal_event_ext, .close_event = efi_close_event, .check_event = efi_check_event, .install_protocol_interface = efi_install_protocol_interface, .reinstall_protocol_interface = efi_reinstall_protocol_interface, .uninstall_protocol_interface = efi_uninstall_protocol_interface, .handle_protocol = efi_handle_protocol, .reserved = NULL, .register_protocol_notify = efi_register_protocol_notify, .locate_handle = efi_locate_handle_ext, .locate_device_path = efi_locate_device_path, .install_configuration_table = efi_install_configuration_table_ext, .load_image = efi_load_image, .start_image = efi_start_image, .exit = efi_exit, .unload_image = efi_unload_image, .exit_boot_services = efi_exit_boot_services, .get_next_monotonic_count = efi_get_next_monotonic_count, .stall = efi_stall, .set_watchdog_timer = efi_set_watchdog_timer, .connect_controller = efi_connect_controller, .disconnect_controller = efi_disconnect_controller, .open_protocol = efi_open_protocol, .close_protocol = efi_close_protocol, .open_protocol_information = efi_open_protocol_information, .protocols_per_handle = efi_protocols_per_handle, .locate_handle_buffer = efi_locate_handle_buffer, .locate_protocol = efi_locate_protocol, .install_multiple_protocol_interfaces = efi_install_multiple_protocol_interfaces, .uninstall_multiple_protocol_interfaces = efi_uninstall_multiple_protocol_interfaces, .calculate_crc32 = efi_calculate_crc32, .copy_mem = efi_copy_mem, .set_mem = efi_set_mem, }; static uint16_t __efi_runtime_data firmware_vendor[] = { 'D','a','s',' ','U','-','b','o','o','t',0 }; struct efi_system_table __efi_runtime_data systab = { .hdr = { .signature = EFI_SYSTEM_TABLE_SIGNATURE, .revision = 0x20005, /* 2.5 */ .headersize = sizeof(struct efi_table_hdr), }, .fw_vendor = (long)firmware_vendor, .con_in = (void*)&efi_con_in, .con_out = (void*)&efi_con_out, .std_err = (void*)&efi_con_out, .runtime = (void*)&efi_runtime_services, .boottime = (void*)&efi_boot_services, .nr_tables = 0, .tables = (void*)efi_conf_table, };