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src/interface/efi/efiprefix.c
157 строк
4 KB
Michael Brown
[efi] Treat a URI device path as higher priority than a cached DHCP packet
05 мар 2026, 15:41
05 мар 2026, 15:41
b677399
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/* * Copyright (C) 2009 Michael Brown <mbrown@fensystems.co.uk>. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of the * License, or any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301, USA. */ FILE_LICENCE ( GPL2_OR_LATER ); FILE_SECBOOT ( PERMITTED ); #include <stdlib.h> #include <errno.h> #include <ipxe/device.h> #include <ipxe/uri.h> #include <ipxe/init.h> #include <ipxe/efi/efi.h> #include <ipxe/efi/efi_driver.h> #include <ipxe/efi/efi_snp.h> #include <ipxe/efi/efi_autoboot.h> #include <ipxe/efi/efi_autoexec.h> #include <ipxe/efi/efi_cachedhcp.h> #include <ipxe/efi/efi_watchdog.h> #include <ipxe/efi/efi_path.h> #include <ipxe/efi/efi_veto.h> /** * EFI entry point * * @v image_handle Image handle * @v systab System table * @ret efirc EFI return status code */ EFI_STATUS EFIAPI _efi_start ( EFI_HANDLE image_handle, EFI_SYSTEM_TABLE *systab ) { EFI_STATUS efirc; int rc; /* Initialise stack cookie */ efi_init_stack_guard ( image_handle ); /* Initialise EFI environment */ if ( ( efirc = efi_init ( image_handle, systab ) ) != 0 ) goto err_init; /* Claim SNP devices for use by iPXE */ efi_snp_claim(); /* Start watchdog holdoff timer */ efi_watchdog_start(); /* Call to main() */ if ( ( rc = main() ) != 0 ) { efirc = EFIRC ( rc ); goto err_main; } err_main: efi_watchdog_stop(); efi_snp_release(); efi_loaded_image->Unload ( image_handle ); efi_driver_reconnect_all(); err_init: return efirc; } /** * Initialise EFI application * */ static void efi_init_application ( void ) { EFI_HANDLE device = efi_loaded_image->DeviceHandle; EFI_DEVICE_PATH_PROTOCOL *devpath = efi_loaded_image_path; EFI_DEVICE_PATH_PROTOCOL *bootpath; struct uri *uri; /* Set current working URI from boot option path, if present */ bootpath = efi_current_boot_path(); DBGC ( device, "EFI has boot option device path %s\n", efi_devpath_text ( bootpath ) ); uri = efi_path_uri ( bootpath ); if ( uri ) churi ( uri ); uri_put ( uri ); free ( bootpath ); /* Identify autoboot device, if any */ efi_set_autoboot_ll_addr ( device, devpath ); /* Store cached DHCP packet, if any */ efi_cachedhcp_record ( device, devpath ); /* Set current working URI from device path, if present */ DBGC ( device, "EFI has loaded image device path %s\n", efi_devpath_text ( devpath ) ); uri = efi_path_uri ( devpath ); if ( uri ) churi ( uri ); uri_put ( uri ); } /** EFI application initialisation function */ struct init_fn efi_init_application_fn __init_fn ( INIT_NORMAL ) = { .name = "efi", .initialise = efi_init_application, }; /** * Probe EFI root bus * * @v rootdev EFI root device */ static int efi_probe ( struct root_device *rootdev __unused ) { /* Try loading autoexec script */ efi_autoexec_load(); /* Remove any vetoed drivers */ efi_veto(); /* Connect our drivers */ return efi_driver_connect_all(); } /** * Remove EFI root bus * * @v rootdev EFI root device */ static void efi_remove ( struct root_device *rootdev __unused ) { /* Disconnect our drivers */ efi_driver_disconnect_all(); } /** EFI root device driver */ static struct root_driver efi_root_driver = { .probe = efi_probe, .remove = efi_remove, }; /** EFI root device */ struct root_device efi_root_device __root_device = { .dev = { .name = "EFI" }, .driver = &efi_root_driver, };