diff options
Diffstat (limited to 'grub-core/loader/efi/chainloader.c')
| -rw-r--r-- | grub-core/loader/efi/chainloader.c | 355 |
1 files changed, 355 insertions, 0 deletions
diff --git a/grub-core/loader/efi/chainloader.c b/grub-core/loader/efi/chainloader.c new file mode 100644 index 0000000..5dd5ada --- /dev/null +++ b/grub-core/loader/efi/chainloader.c @@ -0,0 +1,355 @@ +/* chainloader.c - boot another boot loader */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2002,2004,2006,2007,2008 Free Software Foundation, Inc. + * + * GRUB 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 3 of the License, or + * (at your option) any later version. + * + * GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>. + */ + +/* TODO: support load options. */ + +#include <grub/loader.h> +#include <grub/file.h> +#include <grub/err.h> +#include <grub/device.h> +#include <grub/disk.h> +#include <grub/misc.h> +#include <grub/charset.h> +#include <grub/mm.h> +#include <grub/types.h> +#include <grub/dl.h> +#include <grub/efi/api.h> +#include <grub/efi/efi.h> +#include <grub/efi/disk.h> +#include <grub/command.h> +#include <grub/i18n.h> + +GRUB_MOD_LICENSE ("GPLv3+"); + +static grub_dl_t my_mod; + +static grub_efi_physical_address_t address; +static grub_efi_uintn_t pages; +static grub_efi_device_path_t *file_path; +static grub_efi_handle_t image_handle; +static grub_efi_char16_t *cmdline; + +static grub_err_t +grub_chainloader_unload (void) +{ + grub_efi_boot_services_t *b; + + b = grub_efi_system_table->boot_services; + efi_call_1 (b->unload_image, image_handle); + efi_call_2 (b->free_pages, address, pages); + + grub_free (file_path); + grub_free (cmdline); + cmdline = 0; + file_path = 0; + + grub_dl_unref (my_mod); + return GRUB_ERR_NONE; +} + +static grub_err_t +grub_chainloader_boot (void) +{ + grub_efi_boot_services_t *b; + grub_efi_status_t status; + grub_efi_uintn_t exit_data_size; + grub_efi_char16_t *exit_data = NULL; + + b = grub_efi_system_table->boot_services; + status = efi_call_3 (b->start_image, image_handle, &exit_data_size, &exit_data); + if (status != GRUB_EFI_SUCCESS) + { + if (exit_data) + { + char *buf; + + buf = grub_malloc (exit_data_size * 4 + 1); + if (buf) + { + *grub_utf16_to_utf8 ((grub_uint8_t *) buf, + exit_data, exit_data_size) = 0; + + grub_error (GRUB_ERR_BAD_OS, buf); + grub_free (buf); + } + else + grub_error (GRUB_ERR_BAD_OS, "unknown error"); + } + } + + if (exit_data) + efi_call_1 (b->free_pool, exit_data); + + grub_loader_unset (); + + return grub_errno; +} + +static void +copy_file_path (grub_efi_file_path_device_path_t *fp, + const char *str, grub_efi_uint16_t len) +{ + grub_efi_char16_t *p; + grub_efi_uint16_t size; + + fp->header.type = GRUB_EFI_MEDIA_DEVICE_PATH_TYPE; + fp->header.subtype = GRUB_EFI_FILE_PATH_DEVICE_PATH_SUBTYPE; + size = len * sizeof (grub_efi_char16_t) + sizeof (*fp); + fp->header.length[0] = (grub_efi_uint8_t) (size & 0xff); + fp->header.length[1] = (grub_efi_uint8_t) (size >> 8); + for (p = fp->path_name; len > 0; len--, p++, str++) + { + /* FIXME: this assumes that the path is in ASCII. */ + *p = (grub_efi_char16_t) (*str == '/' ? '\\' : *str); + } +} + +static grub_efi_device_path_t * +make_file_path (grub_efi_device_path_t *dp, const char *filename) +{ + char *dir_start; + char *dir_end; + grub_size_t size; + grub_efi_device_path_t *d; + + dir_start = grub_strchr (filename, ')'); + if (! dir_start) + dir_start = (char *) filename; + else + dir_start++; + + dir_end = grub_strrchr (dir_start, '/'); + if (! dir_end) + { + grub_error (GRUB_ERR_BAD_FILENAME, "invalid EFI file path"); + return 0; + } + + size = 0; + d = dp; + while (1) + { + size += GRUB_EFI_DEVICE_PATH_LENGTH (d); + if ((GRUB_EFI_END_ENTIRE_DEVICE_PATH (d))) + break; + d = GRUB_EFI_NEXT_DEVICE_PATH (d); + } + + file_path = grub_malloc (size + + ((grub_strlen (dir_start) + 1) + * sizeof (grub_efi_char16_t)) + + sizeof (grub_efi_file_path_device_path_t) * 2); + if (! file_path) + return 0; + + grub_memcpy (file_path, dp, size); + + /* Fill the file path for the directory. */ + d = (grub_efi_device_path_t *) ((char *) file_path + + ((char *) d - (char *) dp)); + grub_efi_print_device_path (d); + copy_file_path ((grub_efi_file_path_device_path_t *) d, + dir_start, dir_end - dir_start); + + /* Fill the file path for the file. */ + d = GRUB_EFI_NEXT_DEVICE_PATH (d); + copy_file_path ((grub_efi_file_path_device_path_t *) d, + dir_end + 1, grub_strlen (dir_end + 1)); + + /* Fill the end of device path nodes. */ + d = GRUB_EFI_NEXT_DEVICE_PATH (d); + d->type = GRUB_EFI_END_DEVICE_PATH_TYPE; + d->subtype = GRUB_EFI_END_ENTIRE_DEVICE_PATH_SUBTYPE; + d->length[0] = sizeof (*d); + d->length[1] = 0; + + return file_path; +} + +static grub_err_t +grub_cmd_chainloader (grub_command_t cmd __attribute__ ((unused)), + int argc, char *argv[]) +{ + grub_file_t file = 0; + grub_ssize_t size; + grub_efi_status_t status; + grub_efi_boot_services_t *b; + grub_efi_handle_t dev_handle = 0; + grub_device_t dev = 0; + grub_efi_device_path_t *dp = 0; + grub_efi_loaded_image_t *loaded_image; + char *filename; + + if (argc == 0) + return grub_error (GRUB_ERR_BAD_ARGUMENT, "no file specified"); + filename = argv[0]; + + grub_dl_ref (my_mod); + + /* Initialize some global variables. */ + address = 0; + image_handle = 0; + file_path = 0; + + b = grub_efi_system_table->boot_services; + + file = grub_file_open (filename); + if (! file) + goto fail; + + /* Get the root device's device path. */ + dev = grub_device_open (0); + if (! dev) + goto fail; + + if (dev->disk) + { + dev_handle = grub_efidisk_get_device_handle (dev->disk); + if (dev_handle) + dp = grub_efi_get_device_path (dev_handle); + } + + if (! dev->disk || ! dev_handle || ! dp) + { + grub_error (GRUB_ERR_BAD_DEVICE, "not a valid root device"); + goto fail; + } + + file_path = make_file_path (dp, filename); + if (! file_path) + goto fail; + + grub_printf ("file path: "); + grub_efi_print_device_path (file_path); + + size = grub_file_size (file); + if (!size) + { + grub_error (GRUB_ERR_BAD_OS, "file is empty"); + goto fail; + } + pages = (((grub_efi_uintn_t) size + ((1 << 12) - 1)) >> 12); + + status = efi_call_4 (b->allocate_pages, GRUB_EFI_ALLOCATE_ANY_PAGES, + GRUB_EFI_LOADER_CODE, + pages, &address); + if (status != GRUB_EFI_SUCCESS) + { + grub_error (GRUB_ERR_OUT_OF_MEMORY, "cannot allocate %u pages", pages); + goto fail; + } + + if (grub_file_read (file, (void *) ((grub_addr_t) address), size) != size) + { + if (grub_errno == GRUB_ERR_NONE) + grub_error (GRUB_ERR_BAD_OS, "too small"); + + goto fail; + } + + status = efi_call_6 (b->load_image, 0, grub_efi_image_handle, file_path, + (void *) ((grub_addr_t) address), size, + &image_handle); + if (status != GRUB_EFI_SUCCESS) + { + if (status == GRUB_EFI_OUT_OF_RESOURCES) + grub_error (GRUB_ERR_OUT_OF_MEMORY, "out of resources"); + else + grub_error (GRUB_ERR_BAD_OS, "cannot load image"); + + goto fail; + } + + /* LoadImage does not set a device handler when the image is + loaded from memory, so it is necessary to set it explicitly here. + This is a mess. */ + loaded_image = grub_efi_get_loaded_image (image_handle); + if (! loaded_image) + { + grub_error (GRUB_ERR_BAD_OS, "no loaded image available"); + goto fail; + } + loaded_image->device_handle = dev_handle; + + grub_file_close (file); + + if (argc > 1) + { + int i, len; + grub_efi_char16_t *p16; + + for (i = 1, len = 0; i < argc; i++) + len += grub_strlen (argv[i]) + 1; + + len *= sizeof (grub_efi_char16_t); + cmdline = p16 = grub_malloc (len); + if (! cmdline) + goto fail; + + for (i = 1; i < argc; i++) + { + char *p8; + + p8 = argv[i]; + while (*p8) + *(p16++) = *(p8++); + + *(p16++) = ' '; + } + *(--p16) = 0; + + loaded_image->load_options = cmdline; + loaded_image->load_options_size = len; + } + + grub_loader_set (grub_chainloader_boot, grub_chainloader_unload, 0); + return 0; + + fail: + + if (dev) + grub_device_close (dev); + + if (file) + grub_file_close (file); + + if (file_path) + grub_free (file_path); + + if (address) + efi_call_2 (b->free_pages, address, pages); + + grub_dl_unref (my_mod); + + return grub_errno; +} + +static grub_command_t cmd; + +GRUB_MOD_INIT(chainloader) +{ + cmd = grub_register_command ("chainloader", grub_cmd_chainloader, + 0, N_("Load another boot loader.")); + my_mod = mod; +} + +GRUB_MOD_FINI(chainloader) +{ + grub_unregister_command (cmd); +} |