/*
 *  EFI application boot time services
 *
 *  Copyright (c) 2016 Alexander Graf
 *
 *  SPDX-License-Identifier:     GPL-2.0+
 */

#include <common.h>
#include <efi_loader.h>
#include <malloc.h>
#include <asm/global_data.h>
#include <libfdt_env.h>
#include <u-boot/crc.h>
#include <bootm.h>
#include <inttypes.h>
#include <watchdog.h>

DECLARE_GLOBAL_DATA_PTR;

/* 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[1];

/*
 * 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;

/* Called from do_bootefi_exec() */
void efi_save_gd(void)
{
        efi_gd = gd;
}

/* Called on every callback entry */
void efi_restore_gd(void)
{
        /* Only restore if we're already in EFI context */
        if (!efi_gd)
                return;

        if (gd != efi_gd)
                app_gd = gd;
        gd = efi_gd;
}

/* Called on every callback exit */
efi_status_t efi_exit_func(efi_status_t ret)
{
        gd = app_gd;
        return ret;
}

static efi_status_t efi_unsupported(const char *funcname)
{
        debug("EFI: App called into unimplemented function %s\n", funcname);
        return EFI_EXIT(EFI_UNSUPPORTED);
}

static int guidcmp(const efi_guid_t *g1, const efi_guid_t *g2)
{
        return memcmp(g1, g2, sizeof(efi_guid_t));
}

static unsigned long EFIAPI efi_raise_tpl(unsigned long new_tpl)
{
        EFI_ENTRY("0x%lx", new_tpl);
        return EFI_EXIT(0);
}

static void EFIAPI efi_restore_tpl(unsigned long old_tpl)
{
        EFI_ENTRY("0x%lx", old_tpl);
        EFI_EXIT(efi_unsupported(__func__));
}

efi_status_t EFIAPI efi_allocate_pages_ext(int type, int memory_type,
                                           unsigned long pages,
                                           uint64_t *memory)
{
        efi_status_t r;

        EFI_ENTRY("%d, %d, 0x%lx, %p", type, memory_type, pages, memory);
        r = efi_allocate_pages(type, memory_type, pages, memory);
        return EFI_EXIT(r);
}

efi_status_t EFIAPI efi_free_pages_ext(uint64_t memory, unsigned long pages)
{
        efi_status_t r;

        EFI_ENTRY("%"PRIx64", 0x%lx", memory, pages);
        r = efi_free_pages(memory, pages);
        return EFI_EXIT(r);
}

efi_status_t EFIAPI efi_get_memory_map_ext(unsigned long *memory_map_size,
                                           struct efi_mem_desc *memory_map,
                                           unsigned long *map_key,
                                           unsigned long *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);
}

static efi_status_t EFIAPI efi_allocate_pool(int pool_type, unsigned long size,
                                             void **buffer)
{
        efi_status_t r;

        EFI_ENTRY("%d, %ld, %p", pool_type, size, buffer);
        r = efi_allocate_pages(0, pool_type, (size + 0xfff) >> 12, (void*)buffer);
        return EFI_EXIT(r);
}

static efi_status_t EFIAPI efi_free_pool(void *buffer)
{
        efi_status_t r;

        EFI_ENTRY("%p", buffer);
        r = efi_free_pages((ulong)buffer, 0);
        return EFI_EXIT(r);
}

/*
 * Our event capabilities are very limited. Only support a single
 * event to exist, so we don't need to maintain lists.
 */
static struct {
        enum efi_event_type type;
        u32 trigger_type;
        u32 trigger_time;
        u64 trigger_next;
        unsigned long notify_tpl;
        void (*notify_function) (void *event, void *context);
        void *notify_context;
} efi_event = {
        /* Disable timers on bootup */
        .trigger_next = -1ULL,
};

static efi_status_t EFIAPI efi_create_event(
                        enum efi_event_type type, ulong notify_tpl,
                        void (*notify_function) (void *event, void *context),
                        void *notify_context, void **event)
{
        EFI_ENTRY("%d, 0x%lx, %p, %p", type, notify_tpl, notify_function,
                  notify_context);
        if (efi_event.notify_function) {
                /* We only support one event at a time */
                return EFI_EXIT(EFI_OUT_OF_RESOURCES);
        }

        efi_event.type = type;
        efi_event.notify_tpl = notify_tpl;
        efi_event.notify_function = notify_function;
        efi_event.notify_context = notify_context;
        *event = &efi_event;

        return EFI_EXIT(EFI_SUCCESS);
}

/*
 * Our timers have to work without interrupts, so we check whenever keyboard
 * input or disk accesses happen if enough time elapsed for it to fire.
 */
void efi_timer_check(void)
{
        u64 now = timer_get_us();

        if (now >= efi_event.trigger_next) {
                /* Triggering! */
                if (efi_event.trigger_type == EFI_TIMER_PERIODIC)
                        efi_event.trigger_next += efi_event.trigger_time / 10;
                efi_event.notify_function(&efi_event, efi_event.notify_context);
        }

        WATCHDOG_RESET();
}

static efi_status_t EFIAPI efi_set_timer(void *event, int type,
                                         uint64_t trigger_time)
{
        /* We don't have 64bit division available everywhere, so limit timer
         * distances to 32bit bits. */
        u32 trigger32 = trigger_time;

        EFI_ENTRY("%p, %d, %"PRIx64, event, type, trigger_time);

        if (trigger32 < trigger_time) {
                printf("WARNING: Truncating timer from %"PRIx64" to %x\n",
                       trigger_time, trigger32);
        }

        if (event != &efi_event) {
                /* We only support one event at a time */
                return EFI_EXIT(EFI_INVALID_PARAMETER);
        }

        switch (type) {
        case EFI_TIMER_STOP:
                efi_event.trigger_next = -1ULL;
                break;
        case EFI_TIMER_PERIODIC:
        case EFI_TIMER_RELATIVE:
                efi_event.trigger_next = timer_get_us() + (trigger32 / 10);
                break;
        default:
                return EFI_EXIT(EFI_INVALID_PARAMETER);
        }
        efi_event.trigger_type = type;
        efi_event.trigger_time = trigger_time;

        return EFI_EXIT(EFI_SUCCESS);
}

static efi_status_t EFIAPI efi_wait_for_event(unsigned long num_events,
                                              void *event, unsigned long *index)
{
        u64 now;

        EFI_ENTRY("%ld, %p, %p", num_events, event, index);

        now = timer_get_us();
        while (now < efi_event.trigger_next) { }
        efi_timer_check();

        return EFI_EXIT(EFI_SUCCESS);
}

static efi_status_t EFIAPI efi_signal_event(void *event)
{
        EFI_ENTRY("%p", event);
        return EFI_EXIT(EFI_SUCCESS);
}

static efi_status_t EFIAPI efi_close_event(void *event)
{
        EFI_ENTRY("%p", event);
        efi_event.trigger_next = -1ULL;
        return EFI_EXIT(EFI_SUCCESS);
}

static efi_status_t EFIAPI efi_check_event(void *event)
{
        EFI_ENTRY("%p", event);
        return EFI_EXIT(EFI_NOT_READY);
}

static efi_status_t EFIAPI efi_install_protocol_interface(void **handle,
                        efi_guid_t *protocol, int protocol_interface_type,
                        void *protocol_interface)
{
        EFI_ENTRY("%p, %p, %d, %p", handle, protocol, protocol_interface_type,
                  protocol_interface);
        return EFI_EXIT(EFI_OUT_OF_RESOURCES);
}
static efi_status_t EFIAPI efi_reinstall_protocol_interface(void *handle,
                        efi_guid_t *protocol, void *old_interface,
                        void *new_interface)
{
        EFI_ENTRY("%p, %p, %p, %p", handle, protocol, old_interface,
                  new_interface);
        return EFI_EXIT(EFI_ACCESS_DENIED);
}

static efi_status_t EFIAPI efi_uninstall_protocol_interface(void *handle,
                        efi_guid_t *protocol, void *protocol_interface)
{
        EFI_ENTRY("%p, %p, %p", handle, protocol, protocol_interface);
        return EFI_EXIT(EFI_NOT_FOUND);
}

static efi_status_t EFIAPI efi_register_protocol_notify(efi_guid_t *protocol,
                                                        void *event,
                                                        void **registration)
{
        EFI_ENTRY("%p, %p, %p", protocol, event, registration);
        return EFI_EXIT(EFI_OUT_OF_RESOURCES);
}

static int efi_search(enum efi_locate_search_type search_type,
                      efi_guid_t *protocol, void *search_key,
                      struct efi_object *efiobj)
{
        int i;

        switch (search_type) {
        case all_handles:
                return 0;
        case by_register_notify:
                return -1;
        case by_protocol:
                for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
                        const efi_guid_t *guid = efiobj->protocols[i].guid;
                        if (guid && !guidcmp(guid, protocol))
                                return 0;
                }
                return -1;
        }

        return -1;
}

static efi_status_t EFIAPI efi_locate_handle(
                        enum efi_locate_search_type search_type,
                        efi_guid_t *protocol, void *search_key,
                        unsigned long *buffer_size, efi_handle_t *buffer)
{
        struct list_head *lhandle;
        unsigned long size = 0;

        EFI_ENTRY("%d, %p, %p, %p, %p", search_type, protocol, search_key,
                  buffer_size, buffer);

        /* Count how much space we need */
        list_for_each(lhandle, &efi_obj_list) {
                struct efi_object *efiobj;
                efiobj = list_entry(lhandle, struct efi_object, link);
                if (!efi_search(search_type, protocol, search_key, efiobj)) {
                        size += sizeof(void*);
                }
        }

        if (*buffer_size < size) {
                *buffer_size = size;
                return EFI_EXIT(EFI_BUFFER_TOO_SMALL);
        }

        /* Then fill the array */
        list_for_each(lhandle, &efi_obj_list) {
                struct efi_object *efiobj;
                efiobj = list_entry(lhandle, struct efi_object, link);
                if (!efi_search(search_type, protocol, search_key, efiobj)) {
                        *(buffer++) = efiobj->handle;
                }
        }

        *buffer_size = size;
        return EFI_EXIT(EFI_SUCCESS);
}

static efi_status_t EFIAPI efi_locate_device_path(efi_guid_t *protocol,
                        struct efi_device_path **device_path,
                        efi_handle_t *device)
{
        EFI_ENTRY("%p, %p, %p", protocol, device_path, device);
        return EFI_EXIT(EFI_NOT_FOUND);
}

static efi_status_t EFIAPI efi_install_configuration_table(efi_guid_t *guid,
                                                           void *table)
{
        int i;

        EFI_ENTRY("%p, %p", guid, table);

        /* Check for guid override */
        for (i = 0; i < systab.nr_tables; i++) {
                if (!guidcmp(guid, &efi_conf_table[i].guid)) {
                        efi_conf_table[i].table = table;
                        return EFI_EXIT(EFI_SUCCESS);
                }
        }

        /* No override, check for overflow */
        if (i >= ARRAY_SIZE(efi_conf_table))
                return EFI_EXIT(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;

        return EFI_EXIT(EFI_SUCCESS);
}

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)
{
        static struct efi_object loaded_image_info_obj = {
                .protocols = {
                        {
                                .guid = &efi_guid_loaded_image,
                                .open = &efi_return_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 = malloc(sizeof(*info));
        obj = malloc(sizeof(loaded_image_info_obj));
        memset(info, 0, sizeof(*info));
        memcpy(obj, &loaded_image_info_obj, sizeof(loaded_image_info_obj));
        obj->handle = info;
        info->file_path = file_path;
        info->reserved = efi_load_pe(source_buffer, info);
        if (!info->reserved) {
                free(info);
                free(obj);
                return EFI_EXIT(EFI_UNSUPPORTED);
        }

        *image_handle = info;
        list_add_tail(&obj->link, &efi_obj_list);

        return EFI_EXIT(EFI_SUCCESS);
}

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);
        }

        entry(image_handle, &systab);

        /* Should usually never get here */
        return EFI_EXIT(EFI_SUCCESS);
}

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);

        loaded_image_info->exit_status = exit_status;
        longjmp(&loaded_image_info->exit_jmp);

        panic("EFI application exited");
}

static struct efi_object *efi_search_obj(void *handle)
{
        struct list_head *lhandle;

        list_for_each(lhandle, &efi_obj_list) {
                struct efi_object *efiobj;
                efiobj = list_entry(lhandle, struct efi_object, link);
                if (efiobj->handle == handle)
                        return efiobj;
        }

        return NULL;
}

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);
}

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
}

static efi_status_t EFIAPI efi_exit_boot_services(void *image_handle,
                                                  unsigned long map_key)
{
        EFI_ENTRY("%p, %ld", image_handle, map_key);

        /* 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 */
        WATCHDOG_RESET();

        return EFI_EXIT(EFI_SUCCESS);
}

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);
}

static efi_status_t EFIAPI efi_stall(unsigned long microseconds)
{
        EFI_ENTRY("%ld", microseconds);
        udelay(microseconds);
        return EFI_EXIT(EFI_SUCCESS);
}

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_unsupported(__func__));
}

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);
}

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);
}

static efi_status_t EFIAPI efi_close_protocol(void *handle,
                                              efi_guid_t *protocol,
                                              void *agent_handle,
                                              void *controller_handle)
{
        EFI_ENTRY("%p, %p, %p, %p", handle, protocol, agent_handle,
                  controller_handle);
        return EFI_EXIT(EFI_NOT_FOUND);
}

static efi_status_t EFIAPI efi_open_protocol_information(efi_handle_t handle,
                        efi_guid_t *protocol,
                        struct efi_open_protocol_info_entry **entry_buffer,
                        unsigned long *entry_count)
{
        EFI_ENTRY("%p, %p, %p, %p", handle, protocol, entry_buffer,
                  entry_count);
        return EFI_EXIT(EFI_NOT_FOUND);
}

static efi_status_t EFIAPI efi_protocols_per_handle(void *handle,
                        efi_guid_t ***protocol_buffer,
                        unsigned long *protocol_buffer_count)
{
        EFI_ENTRY("%p, %p, %p", handle, protocol_buffer,
                  protocol_buffer_count);
        return EFI_EXIT(EFI_OUT_OF_RESOURCES);
}

static efi_status_t EFIAPI efi_locate_handle_buffer(
                        enum efi_locate_search_type search_type,
                        efi_guid_t *protocol, void *search_key,
                        unsigned long *no_handles, efi_handle_t **buffer)
{
        EFI_ENTRY("%d, %p, %p, %p, %p", search_type, protocol, search_key,
                  no_handles, buffer);
        return EFI_EXIT(EFI_NOT_FOUND);
}

static struct efi_class_map efi_class_maps[] = {
        {
                .guid = &efi_guid_console_control,
                .interface = &efi_console_control
        },
};

static efi_status_t EFIAPI efi_locate_protocol(efi_guid_t *protocol,
                                               void *registration,
                                               void **protocol_interface)
{
        int i;

        EFI_ENTRY("%p, %p, %p", protocol, registration, protocol_interface);
        for (i = 0; i < ARRAY_SIZE(efi_class_maps); i++) {
                struct efi_class_map *curmap = &efi_class_maps[i];
                if (!guidcmp(protocol, curmap->guid)) {
                        *protocol_interface = (void*)curmap->interface;
                        return EFI_EXIT(EFI_SUCCESS);
                }
        }

        return EFI_EXIT(EFI_NOT_FOUND);
}

static efi_status_t EFIAPI efi_install_multiple_protocol_interfaces(
                        void **handle, ...)
{
        EFI_ENTRY("%p", handle);
        return EFI_EXIT(EFI_OUT_OF_RESOURCES);
}

static efi_status_t EFIAPI efi_uninstall_multiple_protocol_interfaces(
                        void *handle, ...)
{
        EFI_ENTRY("%p", handle);
        return EFI_EXIT(EFI_INVALID_PARAMETER);
}

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);
}

static void EFIAPI efi_copy_mem(void *destination, void *source,
                                unsigned long length)
{
        EFI_ENTRY("%p, %p, %ld", destination, source, length);
        memcpy(destination, source, length);
}

static void EFIAPI efi_set_mem(void *buffer, unsigned long size, uint8_t value)
{
        EFI_ENTRY("%p, %ld, 0x%x", buffer, size, value);
        memset(buffer, value, size);
}

static efi_status_t EFIAPI efi_open_protocol(
                        void *handle, efi_guid_t *protocol,
                        void **protocol_interface, void *agent_handle,
                        void *controller_handle, uint32_t attributes)
{
        struct list_head *lhandle;
        int i;
        efi_status_t r = EFI_UNSUPPORTED;

        EFI_ENTRY("%p, %p, %p, %p, %p, 0x%x", handle, protocol,
                  protocol_interface, agent_handle, controller_handle,
                  attributes);
        list_for_each(lhandle, &efi_obj_list) {
                struct efi_object *efiobj;
                efiobj = list_entry(lhandle, struct efi_object, link);

                if (efiobj->handle != handle)
                        continue;

                for (i = 0; i < ARRAY_SIZE(efiobj->protocols); i++) {
                        struct efi_handler *handler = &efiobj->protocols[i];
                        const efi_guid_t *hprotocol = handler->guid;
                        if (!hprotocol)
                                break;
                        if (!guidcmp(hprotocol, protocol)) {
                                r = handler->open(handle, protocol,
                                    protocol_interface, agent_handle,
                                    controller_handle, attributes);
                                goto out;
                        }
                }
        }

out:
        return EFI_EXIT(r);
}

static efi_status_t EFIAPI efi_handle_protocol(void *handle,
                                               efi_guid_t *protocol,
                                               void **protocol_interface)
{
        return efi_open_protocol(handle, protocol, protocol_interface,
                                 NULL, NULL, 0);
}

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,
        .free_pool = efi_free_pool,
        .create_event = efi_create_event,
        .set_timer = efi_set_timer,
        .wait_for_event = efi_wait_for_event,
        .signal_event = efi_signal_event,
        .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,
        .locate_device_path = efi_locate_device_path,
        .install_configuration_table = efi_install_configuration_table,
        .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,
};