Linux boot calls in efistub

efi_pe_entry()
↦check_platform_features()
↦efi_system_table->boottime->handle_protocol()
↦efi_convert_cmdline()
↦efi_parse_options()
=efi_info("Booting Linux Kernel...\n");
↦setup_graphics()
↦handle_kernel_image()
↦efi_retrieve_tpm2_eventlog()
↦efi_enable_reset_attack_mitigation()
↦efi_get_secureboot()
=efi_err("Ignoring DTB from command line.\n");
↦efi_load_dtb()
=efi_err("Failed to load device tree!\n");
=efi_info("Using DTB from command line\n");
|efi_info("Using DTB from configuration table\n");
|efi_info("Generating empty DTB\n");
↦efi_load_initrd()
↦efi_random_get_seed()
↦get_efi_config_table()
?if (!IS_ENABLED(CONFIG_HIBERNATION) && !efi_nokaslr && !flat_va_mapping)
 =efi_get_random_bytes()
 =virtmap_base = EFI_RT_VIRTUAL_BASE + (((headroom >> 21) * rnd) >> (32 - 21));
↦install_memreserve_table()

↳allocate_new_fdt_and_exit_boot()
 ↦efi_get_memory_map()
 ↦efi_allocate_pages()
 ↦efi_get_memory_map()
 ↦update_fdt()

 ↳efi_exit_boot_services()
   ↦priv_func()
   ↦efi_pci_disable_bridge_busmaster()
   ↦efi_bs_call(exit_boot_services ...)
   
  ↦efi_system_table->runtime->set_virtual_address_map()

 ↦efi_free(MAX_FDT_SIZE, *new_fdt_addr);
 ↦efi_system_table->boottime->free_pool(runtime_map);

=efi_err("Failed to update FDT and exit boot services\n");