// SPDX-License-Identifier: GPL-2.0-only

/* -----------------------------------------------------------------------
 *
 *   Copyright 2011 Intel Corporation; author Matt Fleming
 *
 * ----------------------------------------------------------------------- */

#include <linux/efi.h>
#include <linux/pci.h>
#include <linux/stddef.h>

#include <asm/efi.h>
#include <asm/e820/types.h>
#include <asm/setup.h>
#include <asm/desc.h>
#include <asm/boot.h>

#include "efistub.h"

/* Maximum physical address for 64-bit kernel with 4-level paging */
#define MAXMEM_X86_64_4LEVEL (1ull << 46)

const efi_system_table_t *efi_system_table;
extern u32 image_offset;
static efi_loaded_image_t *image = NULL;

static efi_status_t
preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom)
{
        struct pci_setup_rom *rom = NULL;
        efi_status_t status;
        unsigned long size;
        uint64_t romsize;
        void *romimage;

        /*
         * Some firmware images contain EFI function pointers at the place where
         * the romimage and romsize fields are supposed to be. Typically the EFI
         * code is mapped at high addresses, translating to an unrealistically
         * large romsize. The UEFI spec limits the size of option ROMs to 16
         * MiB so we reject any ROMs over 16 MiB in size to catch this.
         */
        romimage = efi_table_attr(pci, romimage);
        romsize = efi_table_attr(pci, romsize);
        if (!romimage || !romsize || romsize > SZ_16M)
                return EFI_INVALID_PARAMETER;

        size = romsize + sizeof(*rom);

        status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
                             (void **)&rom);
        if (status != EFI_SUCCESS) {
                efi_err("Failed to allocate memory for 'rom'\n");
                return status;
        }

        memset(rom, 0, sizeof(*rom));

        rom->data.type  = SETUP_PCI;
        rom->data.len   = size - sizeof(struct setup_data);
        rom->data.next  = 0;
        rom->pcilen     = pci->romsize;
        *__rom = rom;

        status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16,
                                PCI_VENDOR_ID, 1, &rom->vendor);

        if (status != EFI_SUCCESS) {
                efi_err("Failed to read rom->vendor\n");
                goto free_struct;
        }

        status = efi_call_proto(pci, pci.read, EfiPciIoWidthUint16,
                                PCI_DEVICE_ID, 1, &rom->devid);

        if (status != EFI_SUCCESS) {
                efi_err("Failed to read rom->devid\n");
                goto free_struct;
        }

        status = efi_call_proto(pci, get_location, &rom->segment, &rom->bus,
                                &rom->device, &rom->function);

        if (status != EFI_SUCCESS)
                goto free_struct;

        memcpy(rom->romdata, romimage, romsize);
        return status;

free_struct:
        efi_bs_call(free_pool, rom);
        return status;
}

/*
 * There's no way to return an informative status from this function,
 * because any analysis (and printing of error messages) needs to be
 * done directly at the EFI function call-site.
 *
 * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we
 * just didn't find any PCI devices, but there's no way to tell outside
 * the context of the call.
 */
static void setup_efi_pci(struct boot_params *params)
{
        efi_status_t status;
        void **pci_handle = NULL;
        efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
        unsigned long size = 0;
        struct setup_data *data;
        efi_handle_t h;
        int i;

        status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
                             &pci_proto, NULL, &size, pci_handle);

        if (status == EFI_BUFFER_TOO_SMALL) {
                status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
                                     (void **)&pci_handle);

                if (status != EFI_SUCCESS) {
                        efi_err("Failed to allocate memory for 'pci_handle'\n");
                        return;
                }

                status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
                                     &pci_proto, NULL, &size, pci_handle);
        }

        if (status != EFI_SUCCESS)
                goto free_handle;

        data = (struct setup_data *)(unsigned long)params->hdr.setup_data;

        while (data && data->next)
                data = (struct setup_data *)(unsigned long)data->next;

        for_each_efi_handle(h, pci_handle, size, i) {
                efi_pci_io_protocol_t *pci = NULL;
                struct pci_setup_rom *rom;

                status = efi_bs_call(handle_protocol, h, &pci_proto,
                                     (void **)&pci);
                if (status != EFI_SUCCESS || !pci)
                        continue;

                status = preserve_pci_rom_image(pci, &rom);
                if (status != EFI_SUCCESS)
                        continue;

                if (data)
                        data->next = (unsigned long)rom;
                else
                        params->hdr.setup_data = (unsigned long)rom;

                data = (struct setup_data *)rom;
        }

free_handle:
        efi_bs_call(free_pool, pci_handle);
}

static void retrieve_apple_device_properties(struct boot_params *boot_params)
{
        efi_guid_t guid = APPLE_PROPERTIES_PROTOCOL_GUID;
        struct setup_data *data, *new;
        efi_status_t status;
        u32 size = 0;
        apple_properties_protocol_t *p;

        status = efi_bs_call(locate_protocol, &guid, NULL, (void **)&p);
        if (status != EFI_SUCCESS)
                return;

        if (efi_table_attr(p, version) != 0x10000) {
                efi_err("Unsupported properties proto version\n");
                return;
        }

        efi_call_proto(p, get_all, NULL, &size);
        if (!size)
                return;

        do {
                status = efi_bs_call(allocate_pool, EFI_LOADER_DATA,
                                     size + sizeof(struct setup_data),
                                     (void **)&new);
                if (status != EFI_SUCCESS) {
                        efi_err("Failed to allocate memory for 'properties'\n");
                        return;
                }

                status = efi_call_proto(p, get_all, new->data, &size);

                if (status == EFI_BUFFER_TOO_SMALL)
                        efi_bs_call(free_pool, new);
        } while (status == EFI_BUFFER_TOO_SMALL);

        new->type = SETUP_APPLE_PROPERTIES;
        new->len  = size;
        new->next = 0;

        data = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data;
        if (!data) {
                boot_params->hdr.setup_data = (unsigned long)new;
        } else {
                while (data->next)
                        data = (struct setup_data *)(unsigned long)data->next;
                data->next = (unsigned long)new;
        }
}

static const efi_char16_t apple[] = L"Apple";

static void setup_quirks(struct boot_params *boot_params)
{
        efi_char16_t *fw_vendor = (efi_char16_t *)(unsigned long)
                efi_table_attr(efi_system_table, fw_vendor);

        if (!memcmp(fw_vendor, apple, sizeof(apple))) {
                if (IS_ENABLED(CONFIG_APPLE_PROPERTIES))
                        retrieve_apple_device_properties(boot_params);
        }
}

/*
 * See if we have Universal Graphics Adapter (UGA) protocol
 */
static efi_status_t
setup_uga(struct screen_info *si, efi_guid_t *uga_proto, unsigned long size)
{
        efi_status_t status;
        u32 width, height;
        void **uga_handle = NULL;
        efi_uga_draw_protocol_t *uga = NULL, *first_uga;
        efi_handle_t handle;
        int i;

        status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
                             (void **)&uga_handle);
        if (status != EFI_SUCCESS)
                return status;

        status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
                             uga_proto, NULL, &size, uga_handle);
        if (status != EFI_SUCCESS)
                goto free_handle;

        height = 0;
        width = 0;

        first_uga = NULL;
        for_each_efi_handle(handle, uga_handle, size, i) {
                efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
                u32 w, h, depth, refresh;
                void *pciio;

                status = efi_bs_call(handle_protocol, handle, uga_proto,
                                     (void **)&uga);
                if (status != EFI_SUCCESS)
                        continue;

                pciio = NULL;
                efi_bs_call(handle_protocol, handle, &pciio_proto, &pciio);

                status = efi_call_proto(uga, get_mode, &w, &h, &depth, &refresh);
                if (status == EFI_SUCCESS && (!first_uga || pciio)) {
                        width = w;
                        height = h;

                        /*
                         * Once we've found a UGA supporting PCIIO,
                         * don't bother looking any further.
                         */
                        if (pciio)
                                break;

                        first_uga = uga;
                }
        }

        if (!width && !height)
                goto free_handle;

        /* EFI framebuffer */
        si->orig_video_isVGA    = VIDEO_TYPE_EFI;

        si->lfb_depth           = 32;
        si->lfb_width           = width;
        si->lfb_height          = height;

        si->red_size            = 8;
        si->red_pos             = 16;
        si->green_size          = 8;
        si->green_pos           = 8;
        si->blue_size           = 8;
        si->blue_pos            = 0;
        si->rsvd_size           = 8;
        si->rsvd_pos            = 24;

free_handle:
        efi_bs_call(free_pool, uga_handle);

        return status;
}

static void setup_graphics(struct boot_params *boot_params)
{
        efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
        struct screen_info *si;
        efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
        efi_status_t status;
        unsigned long size;
        void **gop_handle = NULL;
        void **uga_handle = NULL;

        si = &boot_params->screen_info;
        memset(si, 0, sizeof(*si));

        size = 0;
        status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
                             &graphics_proto, NULL, &size, gop_handle);
        if (status == EFI_BUFFER_TOO_SMALL)
                status = efi_setup_gop(si, &graphics_proto, size);

        if (status != EFI_SUCCESS) {
                size = 0;
                status = efi_bs_call(locate_handle, EFI_LOCATE_BY_PROTOCOL,
                                     &uga_proto, NULL, &size, uga_handle);
                if (status == EFI_BUFFER_TOO_SMALL)
                        setup_uga(si, &uga_proto, size);
        }
}


static void __noreturn efi_exit(efi_handle_t handle, efi_status_t status)
{
        efi_bs_call(exit, handle, status, 0, NULL);
        for(;;)
                asm("hlt");
}

void startup_32(struct boot_params *boot_params);

void __noreturn efi_stub_entry(efi_handle_t handle,
                               efi_system_table_t *sys_table_arg,
                               struct boot_params *boot_params);

/*
 * Because the x86 boot code expects to be passed a boot_params we
 * need to create one ourselves (usually the bootloader would create
 * one for us).
 */
efi_status_t __efiapi efi_pe_entry(efi_handle_t handle,
                                   efi_system_table_t *sys_table_arg)
{
        struct boot_params *boot_params;
        struct setup_header *hdr;
        void *image_base;
        efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
        int options_size = 0;
        efi_status_t status;
        char *cmdline_ptr;

        efi_system_table = sys_table_arg;

        /* Check if we were booted by the EFI firmware */
        if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
                efi_exit(handle, EFI_INVALID_PARAMETER);

        status = efi_bs_call(handle_protocol, handle, &proto, (void **)&image);
        if (status != EFI_SUCCESS) {
                efi_err("Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
                efi_exit(handle, status);
        }

        image_base = efi_table_attr(image, image_base);
        image_offset = (void *)startup_32 - image_base;

        status = efi_allocate_pages(sizeof(struct boot_params),
                                    (unsigned long *)&boot_params, ULONG_MAX);
        if (status != EFI_SUCCESS) {
                efi_err("Failed to allocate lowmem for boot params\n");
                efi_exit(handle, status);
        }

        memset(boot_params, 0x0, sizeof(struct boot_params));

        hdr = &boot_params->hdr;

        /* Copy the setup header from the second sector to boot_params */
        memcpy(&hdr->jump, image_base + 512,
               sizeof(struct setup_header) - offsetof(struct setup_header, jump));

        /*
         * Fill out some of the header fields ourselves because the
         * EFI firmware loader doesn't load the first sector.
         */
        hdr->root_flags = 1;
        hdr->vid_mode   = 0xffff;
        hdr->boot_flag  = 0xAA55;

        hdr->type_of_loader = 0x21;

        /* Convert unicode cmdline to ascii */
        cmdline_ptr = efi_convert_cmdline(image, &options_size);
        if (!cmdline_ptr)
                goto fail;

        efi_set_u64_split((unsigned long)cmdline_ptr,
                          &hdr->cmd_line_ptr, &boot_params->ext_cmd_line_ptr);

        hdr->ramdisk_image = 0;
        hdr->ramdisk_size = 0;

        efi_stub_entry(handle, sys_table_arg, boot_params);
        /* not reached */

fail:
        efi_free(sizeof(struct boot_params), (unsigned long)boot_params);

        efi_exit(handle, status);
}

static void add_e820ext(struct boot_params *params,
                        struct setup_data *e820ext, u32 nr_entries)
{
        struct setup_data *data;

        e820ext->type = SETUP_E820_EXT;
        e820ext->len  = nr_entries * sizeof(struct boot_e820_entry);
        e820ext->next = 0;

        data = (struct setup_data *)(unsigned long)params->hdr.setup_data;

        while (data && data->next)
                data = (struct setup_data *)(unsigned long)data->next;

        if (data)
                data->next = (unsigned long)e820ext;
        else
                params->hdr.setup_data = (unsigned long)e820ext;
}

static efi_status_t
setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_size)
{
        struct boot_e820_entry *entry = params->e820_table;
        struct efi_info *efi = &params->efi_info;
        struct boot_e820_entry *prev = NULL;
        u32 nr_entries;
        u32 nr_desc;
        int i;

        nr_entries = 0;
        nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size;

        for (i = 0; i < nr_desc; i++) {
                efi_memory_desc_t *d;
                unsigned int e820_type = 0;
                unsigned long m = efi->efi_memmap;

#ifdef CONFIG_X86_64
                m |= (u64)efi->efi_memmap_hi << 32;
#endif

                d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i);
                switch (d->type) {
                case EFI_RESERVED_TYPE:
                case EFI_RUNTIME_SERVICES_CODE:
                case EFI_RUNTIME_SERVICES_DATA:
                case EFI_MEMORY_MAPPED_IO:
                case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
                case EFI_PAL_CODE:
                        e820_type = E820_TYPE_RESERVED;
                        break;

                case EFI_UNUSABLE_MEMORY:
                        e820_type = E820_TYPE_UNUSABLE;
                        break;

                case EFI_ACPI_RECLAIM_MEMORY:
                        e820_type = E820_TYPE_ACPI;
                        break;

                case EFI_LOADER_CODE:
                case EFI_LOADER_DATA:
                case EFI_BOOT_SERVICES_CODE:
                case EFI_BOOT_SERVICES_DATA:
                case EFI_CONVENTIONAL_MEMORY:
                        if (efi_soft_reserve_enabled() &&
                            (d->attribute & EFI_MEMORY_SP))
                                e820_type = E820_TYPE_SOFT_RESERVED;
                        else
                                e820_type = E820_TYPE_RAM;
                        break;

                case EFI_ACPI_MEMORY_NVS:
                        e820_type = E820_TYPE_NVS;
                        break;

                case EFI_PERSISTENT_MEMORY:
                        e820_type = E820_TYPE_PMEM;
                        break;

                default:
                        continue;
                }

                /* Merge adjacent mappings */
                if (prev && prev->type == e820_type &&
                    (prev->addr + prev->size) == d->phys_addr) {
                        prev->size += d->num_pages << 12;
                        continue;
                }

                if (nr_entries == ARRAY_SIZE(params->e820_table)) {
                        u32 need = (nr_desc - i) * sizeof(struct e820_entry) +
                                   sizeof(struct setup_data);

                        if (!e820ext || e820ext_size < need)
                                return EFI_BUFFER_TOO_SMALL;

                        /* boot_params map full, switch to e820 extended */
                        entry = (struct boot_e820_entry *)e820ext->data;
                }

                entry->addr = d->phys_addr;
                entry->size = d->num_pages << PAGE_SHIFT;
                entry->type = e820_type;
                prev = entry++;
                nr_entries++;
        }

        if (nr_entries > ARRAY_SIZE(params->e820_table)) {
                u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table);

                add_e820ext(params, e820ext, nr_e820ext);
                nr_entries -= nr_e820ext;
        }

        params->e820_entries = (u8)nr_entries;

        return EFI_SUCCESS;
}

static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext,
                                  u32 *e820ext_size)
{
        efi_status_t status;
        unsigned long size;

        size = sizeof(struct setup_data) +
                sizeof(struct e820_entry) * nr_desc;

        if (*e820ext) {
                efi_bs_call(free_pool, *e820ext);
                *e820ext = NULL;
                *e820ext_size = 0;
        }

        status = efi_bs_call(allocate_pool, EFI_LOADER_DATA, size,
                             (void **)e820ext);
        if (status == EFI_SUCCESS)
                *e820ext_size = size;

        return status;
}

static efi_status_t allocate_e820(struct boot_params *params,
                                  struct setup_data **e820ext,
                                  u32 *e820ext_size)
{
        unsigned long map_size, desc_size, map_key;
        efi_status_t status;
        __u32 nr_desc, desc_version;

        /* Only need the size of the mem map and size of each mem descriptor */
        map_size = 0;
        status = efi_bs_call(get_memory_map, &map_size, NULL, &map_key,
                             &desc_size, &desc_version);
        if (status != EFI_BUFFER_TOO_SMALL)
                return (status != EFI_SUCCESS) ? status : EFI_UNSUPPORTED;

        nr_desc = map_size / desc_size + EFI_MMAP_NR_SLACK_SLOTS;

        if (nr_desc > ARRAY_SIZE(params->e820_table)) {
                u32 nr_e820ext = nr_desc - ARRAY_SIZE(params->e820_table);

                status = alloc_e820ext(nr_e820ext, e820ext, e820ext_size);
                if (status != EFI_SUCCESS)
                        return status;
        }

        return EFI_SUCCESS;
}

struct exit_boot_struct {
        struct boot_params      *boot_params;
        struct efi_info         *efi;
};

static efi_status_t exit_boot_func(struct efi_boot_memmap *map,
                                   void *priv)
{
        const char *signature;
        struct exit_boot_struct *p = priv;

        signature = efi_is_64bit() ? EFI64_LOADER_SIGNATURE
                                   : EFI32_LOADER_SIGNATURE;
        memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32));

        efi_set_u64_split((unsigned long)efi_system_table,
                          &p->efi->efi_systab, &p->efi->efi_systab_hi);
        p->efi->efi_memdesc_size        = *map->desc_size;
        p->efi->efi_memdesc_version     = *map->desc_ver;
        efi_set_u64_split((unsigned long)*map->map,
                          &p->efi->efi_memmap, &p->efi->efi_memmap_hi);
        p->efi->efi_memmap_size         = *map->map_size;

        return EFI_SUCCESS;
}

static efi_status_t exit_boot(struct boot_params *boot_params, void *handle)
{
        unsigned long map_sz, key, desc_size, buff_size;
        efi_memory_desc_t *mem_map;
        struct setup_data *e820ext = NULL;
        __u32 e820ext_size = 0;
        efi_status_t status;
        __u32 desc_version;
        struct efi_boot_memmap map;
        struct exit_boot_struct priv;

        map.map                 = &mem_map;
        map.map_size            = &map_sz;
        map.desc_size           = &desc_size;
        map.desc_ver            = &desc_version;
        map.key_ptr             = &key;
        map.buff_size           = &buff_size;
        priv.boot_params        = boot_params;
        priv.efi                = &boot_params->efi_info;

        status = allocate_e820(boot_params, &e820ext, &e820ext_size);
        if (status != EFI_SUCCESS)
                return status;

        /* Might as well exit boot services now */
        status = efi_exit_boot_services(handle, &map, &priv, exit_boot_func);
        if (status != EFI_SUCCESS)
                return status;

        /* Historic? */
        boot_params->alt_mem_k  = 32 * 1024;

        status = setup_e820(boot_params, e820ext, e820ext_size);
        if (status != EFI_SUCCESS)
                return status;

        return EFI_SUCCESS;
}

/*
 * On success, we return the address of startup_32, which has potentially been
 * relocated by efi_relocate_kernel.
 * On failure, we exit to the firmware via efi_exit instead of returning.
 */
unsigned long efi_main(efi_handle_t handle,
                             efi_system_table_t *sys_table_arg,
                             struct boot_params *boot_params)
{
        unsigned long bzimage_addr = (unsigned long)startup_32;
        unsigned long buffer_start, buffer_end;
        struct setup_header *hdr = &boot_params->hdr;
        efi_status_t status;

        efi_system_table = sys_table_arg;

        /* Check if we were booted by the EFI firmware */
        if (efi_system_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
                efi_exit(handle, EFI_INVALID_PARAMETER);

        /*
         * If the kernel isn't already loaded at a suitable address,
         * relocate it.
         *
         * It must be loaded above LOAD_PHYSICAL_ADDR.
         *
         * The maximum address for 64-bit is 1 << 46 for 4-level paging. This
         * is defined as the macro MAXMEM, but unfortunately that is not a
         * compile-time constant if 5-level paging is configured, so we instead
         * define our own macro for use here.
         *
         * For 32-bit, the maximum address is complicated to figure out, for
         * now use KERNEL_IMAGE_SIZE, which will be 512MiB, the same as what
         * KASLR uses.
         *
         * Also relocate it if image_offset is zero, i.e. the kernel wasn't
         * loaded by LoadImage, but rather by a bootloader that called the
         * handover entry. The reason we must always relocate in this case is
         * to handle the case of systemd-boot booting a unified kernel image,
         * which is a PE executable that contains the bzImage and an initrd as
         * COFF sections. The initrd section is placed after the bzImage
         * without ensuring that there are at least init_size bytes available
         * for the bzImage, and thus the compressed kernel's startup code may
         * overwrite the initrd unless it is moved out of the way.
         */

        buffer_start = ALIGN(bzimage_addr - image_offset,
                             hdr->kernel_alignment);
        buffer_end = buffer_start + hdr->init_size;

        if ((buffer_start < LOAD_PHYSICAL_ADDR)                              ||
            (IS_ENABLED(CONFIG_X86_32) && buffer_end > KERNEL_IMAGE_SIZE)    ||
            (IS_ENABLED(CONFIG_X86_64) && buffer_end > MAXMEM_X86_64_4LEVEL) ||
            (image_offset == 0)) {
                extern char _bss[];

                status = efi_relocate_kernel(&bzimage_addr,
                                             (unsigned long)_bss - bzimage_addr,
                                             hdr->init_size,
                                             hdr->pref_address,
                                             hdr->kernel_alignment,
                                             LOAD_PHYSICAL_ADDR);
                if (status != EFI_SUCCESS) {
                        efi_err("efi_relocate_kernel() failed!\n");
                        goto fail;
                }
                /*
                 * Now that we've copied the kernel elsewhere, we no longer
                 * have a set up block before startup_32(), so reset image_offset
                 * to zero in case it was set earlier.
                 */
                image_offset = 0;
        }

#ifdef CONFIG_CMDLINE_BOOL
        status = efi_parse_options(CONFIG_CMDLINE);
        if (status != EFI_SUCCESS) {
                efi_err("Failed to parse options\n");
                goto fail;
        }
#endif
        if (!IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
                unsigned long cmdline_paddr = ((u64)hdr->cmd_line_ptr |
                                               ((u64)boot_params->ext_cmd_line_ptr << 32));
                status = efi_parse_options((char *)cmdline_paddr);
                if (status != EFI_SUCCESS) {
                        efi_err("Failed to parse options\n");
                        goto fail;
                }
        }

        /*
         * At this point, an initrd may already have been loaded by the
         * bootloader and passed via bootparams. We permit an initrd loaded
         * from the LINUX_EFI_INITRD_MEDIA_GUID device path to supersede it.
         *
         * If the device path is not present, any command-line initrd=
         * arguments will be processed only if image is not NULL, which will be
         * the case only if we were loaded via the PE entry point.
         */
        if (!efi_noinitrd) {
                unsigned long addr, size;

                status = efi_load_initrd(image, &addr, &size,
                                         hdr->initrd_addr_max, ULONG_MAX);

                if (status != EFI_SUCCESS) {
                        efi_err("Failed to load initrd!\n");
                        goto fail;
                }
                if (size > 0) {
                        efi_set_u64_split(addr, &hdr->ramdisk_image,
                                          &boot_params->ext_ramdisk_image);
                        efi_set_u64_split(size, &hdr->ramdisk_size,
                                          &boot_params->ext_ramdisk_size);
                }
        }

        /*
         * If the boot loader gave us a value for secure_boot then we use that,
         * otherwise we ask the BIOS.
         */
        if (boot_params->secure_boot == efi_secureboot_mode_unset)
                boot_params->secure_boot = efi_get_secureboot();

        /* Ask the firmware to clear memory on unclean shutdown */
        efi_enable_reset_attack_mitigation();

        efi_random_get_seed();

        efi_retrieve_tpm2_eventlog();

        setup_graphics(boot_params);

        setup_efi_pci(boot_params);

        setup_quirks(boot_params);

        status = exit_boot(boot_params, handle);
        if (status != EFI_SUCCESS) {
                efi_err("exit_boot() failed!\n");
                goto fail;
        }

        return bzimage_addr;
fail:
        efi_err("efi_main() failed!\n");

        efi_exit(handle, status);
}