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BVK Chaitanya
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265d68cd10
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8c41176882
810 changed files with 4980 additions and 2508 deletions
347
grub-core/loader/efi/chainloader.c
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347
grub-core/loader/efi/chainloader.c
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/* chainloader.c - boot another boot loader */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2002,2004,2006,2007,2008 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* TODO: support load options. */
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#include <grub/loader.h>
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#include <grub/file.h>
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#include <grub/err.h>
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#include <grub/device.h>
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#include <grub/disk.h>
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#include <grub/misc.h>
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#include <grub/charset.h>
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#include <grub/mm.h>
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#include <grub/types.h>
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#include <grub/dl.h>
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#include <grub/efi/api.h>
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#include <grub/efi/efi.h>
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#include <grub/efi/disk.h>
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#include <grub/command.h>
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#include <grub/i18n.h>
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static grub_dl_t my_mod;
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static grub_efi_physical_address_t address;
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static grub_efi_uintn_t pages;
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static grub_efi_device_path_t *file_path;
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static grub_efi_handle_t image_handle;
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static grub_efi_char16_t *cmdline;
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static grub_err_t
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grub_chainloader_unload (void)
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{
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grub_efi_boot_services_t *b;
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b = grub_efi_system_table->boot_services;
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efi_call_1 (b->unload_image, image_handle);
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efi_call_2 (b->free_pages, address, pages);
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grub_free (file_path);
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grub_free (cmdline);
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cmdline = 0;
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grub_dl_unref (my_mod);
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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grub_chainloader_boot (void)
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{
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grub_efi_boot_services_t *b;
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grub_efi_status_t status;
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grub_efi_uintn_t exit_data_size;
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grub_efi_char16_t *exit_data;
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b = grub_efi_system_table->boot_services;
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status = efi_call_3 (b->start_image, image_handle, &exit_data_size, &exit_data);
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if (status != GRUB_EFI_SUCCESS)
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{
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if (exit_data)
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{
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char *buf;
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buf = grub_malloc (exit_data_size * 4 + 1);
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if (buf)
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{
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*grub_utf16_to_utf8 ((grub_uint8_t *) buf,
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exit_data, exit_data_size) = 0;
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grub_error (GRUB_ERR_BAD_OS, buf);
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grub_free (buf);
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}
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else
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grub_error (GRUB_ERR_BAD_OS, "unknown error");
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}
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}
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if (exit_data)
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efi_call_1 (b->free_pool, exit_data);
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grub_chainloader_unload ();
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return grub_errno;
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}
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static void
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copy_file_path (grub_efi_file_path_device_path_t *fp,
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const char *str, grub_efi_uint16_t len)
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{
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grub_efi_char16_t *p;
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grub_efi_uint16_t size;
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fp->header.type = GRUB_EFI_MEDIA_DEVICE_PATH_TYPE;
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fp->header.subtype = GRUB_EFI_FILE_PATH_DEVICE_PATH_SUBTYPE;
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size = len * sizeof (grub_efi_char16_t) + sizeof (*fp);
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fp->header.length[0] = (grub_efi_uint8_t) (size & 0xff);
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fp->header.length[1] = (grub_efi_uint8_t) (size >> 8);
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for (p = fp->path_name; len > 0; len--, p++, str++)
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{
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/* FIXME: this assumes that the path is in ASCII. */
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*p = (grub_efi_char16_t) (*str == '/' ? '\\' : *str);
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}
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}
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static grub_efi_device_path_t *
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make_file_path (grub_efi_device_path_t *dp, const char *filename)
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{
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char *dir_start;
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char *dir_end;
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grub_size_t size;
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grub_efi_device_path_t *d;
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dir_start = grub_strchr (filename, ')');
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if (! dir_start)
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dir_start = (char *) filename;
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else
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dir_start++;
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dir_end = grub_strrchr (dir_start, '/');
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if (! dir_end)
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{
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grub_error (GRUB_ERR_BAD_FILENAME, "invalid EFI file path");
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return 0;
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}
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size = 0;
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d = dp;
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while (1)
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{
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size += GRUB_EFI_DEVICE_PATH_LENGTH (d);
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if ((GRUB_EFI_END_ENTIRE_DEVICE_PATH (d)))
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break;
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d = GRUB_EFI_NEXT_DEVICE_PATH (d);
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}
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file_path = grub_malloc (size
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+ ((grub_strlen (dir_start) + 1)
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* sizeof (grub_efi_char16_t))
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+ sizeof (grub_efi_file_path_device_path_t) * 2);
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if (! file_path)
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return 0;
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grub_memcpy (file_path, dp, size);
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/* Fill the file path for the directory. */
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d = (grub_efi_device_path_t *) ((char *) file_path
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+ ((char *) d - (char *) dp));
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grub_efi_print_device_path (d);
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copy_file_path ((grub_efi_file_path_device_path_t *) d,
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dir_start, dir_end - dir_start);
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/* Fill the file path for the file. */
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d = GRUB_EFI_NEXT_DEVICE_PATH (d);
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copy_file_path ((grub_efi_file_path_device_path_t *) d,
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dir_end + 1, grub_strlen (dir_end + 1));
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/* Fill the end of device path nodes. */
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d = GRUB_EFI_NEXT_DEVICE_PATH (d);
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d->type = GRUB_EFI_END_DEVICE_PATH_TYPE;
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d->subtype = GRUB_EFI_END_ENTIRE_DEVICE_PATH_SUBTYPE;
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d->length[0] = sizeof (*d);
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d->length[1] = 0;
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return file_path;
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}
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static grub_err_t
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grub_cmd_chainloader (grub_command_t cmd __attribute__ ((unused)),
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int argc, char *argv[])
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{
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grub_file_t file = 0;
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grub_ssize_t size;
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grub_efi_status_t status;
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grub_efi_boot_services_t *b;
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grub_efi_handle_t dev_handle = 0;
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grub_device_t dev = 0;
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grub_efi_device_path_t *dp = 0;
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grub_efi_loaded_image_t *loaded_image;
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char *filename;
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if (argc == 0)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "no file specified");
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filename = argv[0];
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grub_dl_ref (my_mod);
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/* Initialize some global variables. */
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address = 0;
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image_handle = 0;
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file_path = 0;
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b = grub_efi_system_table->boot_services;
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file = grub_file_open (filename);
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if (! file)
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goto fail;
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/* Get the root device's device path. */
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dev = grub_device_open (0);
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if (! dev)
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goto fail;
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if (dev->disk)
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{
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dev_handle = grub_efidisk_get_device_handle (dev->disk);
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if (dev_handle)
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dp = grub_efi_get_device_path (dev_handle);
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}
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if (! dev->disk || ! dev_handle || ! dp)
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{
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grub_error (GRUB_ERR_BAD_DEVICE, "not a valid root device");
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goto fail;
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}
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file_path = make_file_path (dp, filename);
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if (! file_path)
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goto fail;
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grub_printf ("file path: ");
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grub_efi_print_device_path (file_path);
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size = grub_file_size (file);
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pages = (((grub_efi_uintn_t) size + ((1 << 12) - 1)) >> 12);
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status = efi_call_4 (b->allocate_pages, GRUB_EFI_ALLOCATE_ANY_PAGES,
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GRUB_EFI_LOADER_CODE,
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pages, &address);
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if (status != GRUB_EFI_SUCCESS)
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{
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grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate %u pages", pages);
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goto fail;
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}
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if (grub_file_read (file, (void *) ((grub_addr_t) address), size) != size)
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{
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if (grub_errno == GRUB_ERR_NONE)
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grub_error (GRUB_ERR_BAD_OS, "too small");
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goto fail;
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}
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status = efi_call_6 (b->load_image, 0, grub_efi_image_handle, file_path,
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(void *) ((grub_addr_t) address), size,
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&image_handle);
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if (status != GRUB_EFI_SUCCESS)
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{
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if (status == GRUB_EFI_OUT_OF_RESOURCES)
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grub_error (GRUB_ERR_OUT_OF_MEMORY, "out of resources");
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else
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grub_error (GRUB_ERR_BAD_OS, "cannot load image");
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goto fail;
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}
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/* LoadImage does not set a device handler when the image is
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loaded from memory, so it is necessary to set it explicitly here.
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This is a mess. */
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loaded_image = grub_efi_get_loaded_image (image_handle);
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if (! loaded_image)
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{
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grub_error (GRUB_ERR_BAD_OS, "no loaded image available");
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goto fail;
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}
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loaded_image->device_handle = dev_handle;
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grub_file_close (file);
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if (argc > 1)
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{
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int i, len;
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grub_efi_char16_t *p16;
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for (i = 1, len = 0; i < argc; i++)
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len += grub_strlen (argv[i]) + 1;
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len *= sizeof (grub_efi_char16_t);
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cmdline = p16 = grub_malloc (len);
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if (! cmdline)
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goto fail;
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for (i = 1; i < argc; i++)
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{
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char *p8;
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p8 = argv[i];
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while (*p8)
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*(p16++) = *(p8++);
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*(p16++) = ' ';
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}
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*(--p16) = 0;
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loaded_image->load_options = cmdline;
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loaded_image->load_options_size = len;
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}
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grub_loader_set (grub_chainloader_boot, grub_chainloader_unload, 0);
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return 0;
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fail:
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if (dev)
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grub_device_close (dev);
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if (file)
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grub_file_close (file);
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if (file_path)
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grub_free (file_path);
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if (address)
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efi_call_2 (b->free_pages, address, pages);
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grub_dl_unref (my_mod);
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return grub_errno;
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}
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static grub_command_t cmd;
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GRUB_MOD_INIT(chainloader)
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{
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cmd = grub_register_command ("chainloader", grub_cmd_chainloader,
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0, N_("Load another boot loader."));
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my_mod = mod;
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}
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GRUB_MOD_FINI(chainloader)
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{
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grub_unregister_command (cmd);
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}
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