diff options
Diffstat (limited to 'grub-core/loader/i386/pc/pxechainloader.c')
| -rw-r--r-- | grub-core/loader/i386/pc/pxechainloader.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/grub-core/loader/i386/pc/pxechainloader.c b/grub-core/loader/i386/pc/pxechainloader.c new file mode 100644 index 0000000..acb0611 --- /dev/null +++ b/grub-core/loader/i386/pc/pxechainloader.c @@ -0,0 +1,168 @@ +/* chainloader.c - boot another boot loader */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2002,2004,2007,2009,2010,2012 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/>. + */ + +#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/types.h> +#include <grub/partition.h> +#include <grub/dl.h> +#include <grub/command.h> +#include <grub/machine/biosnum.h> +#include <grub/i18n.h> +#include <grub/video.h> +#include <grub/mm.h> +#include <grub/cpu/relocator.h> +#include <grub/machine/pxe.h> +#include <grub/net.h> + +static grub_dl_t my_mod; +static struct grub_relocator *rel; +static grub_uint32_t edx = 0xffffffff; +static char boot_file[128]; +static char server_name[64]; + +GRUB_MOD_LICENSE ("GPLv3+"); + +static grub_err_t +grub_pxechain_boot (void) +{ + struct grub_relocator16_state state = { + .cs = 0, + .ip = 0x7c00, + .ds = 0, + .es = 0, + .fs = 0, + .gs = 0, + .ss = 0, + .sp = 0x7c00, + .edx = edx + }; + struct grub_net_bootp_packet *bp; + + bp = grub_pxe_get_cached (GRUB_PXENV_PACKET_TYPE_DHCP_ACK); + + grub_video_set_mode ("text", 0, 0); + + if (bp && boot_file[0]) + grub_memcpy (bp->boot_file, boot_file, sizeof (bp->boot_file)); + if (bp && server_name[0]) + grub_memcpy (bp->server_name, server_name, sizeof (bp->server_name)); + + return grub_relocator16_boot (rel, state); +} + +static grub_err_t +grub_pxechain_unload (void) +{ + grub_relocator_unload (rel); + rel = NULL; + grub_dl_unref (my_mod); + return GRUB_ERR_NONE; +} + +static grub_err_t +grub_cmd_pxechain (grub_command_t cmd __attribute__ ((unused)), + int argc, char *argv[]) +{ + grub_file_t file = 0; + grub_err_t err; + void *image; + grub_size_t imagesize; + char *fname; + + if (argc == 0) + return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected")); + + grub_dl_ref (my_mod); + + rel = grub_relocator_new (); + if (!rel) + goto fail; + + file = grub_file_open (argv[0], GRUB_FILE_TYPE_PXECHAINLOADER); + if (! file) + goto fail; + + if (file->device->net && file->device->net->name) + fname = file->device->net->name; + else + { + fname = argv[0]; + if (fname[0] == '(') + { + fname = grub_strchr (fname, ')'); + if (fname) + fname++; + else + fname = argv[0]; + } + } + + grub_memset (boot_file, 0, sizeof (boot_file)); + grub_strncpy (boot_file, fname, sizeof (boot_file)); + + grub_memset (server_name, 0, sizeof (server_name)); + if (file->device->net && file->device->net->server) + grub_strncpy (server_name, file->device->net->server, sizeof (server_name)); + + edx = grub_get_root_biosnumber (); + + imagesize = grub_file_size (file); + { + grub_relocator_chunk_t ch; + err = grub_relocator_alloc_chunk_addr (rel, &ch, 0x7c00, imagesize); + if (err) + goto fail; + image = get_virtual_current_address (ch); + } + + if (grub_file_read (file, image, imagesize) != (grub_ssize_t) imagesize) + goto fail; + + grub_loader_set (grub_pxechain_boot, grub_pxechain_unload, + GRUB_LOADER_FLAG_NORETURN | GRUB_LOADER_FLAG_PXE_NOT_UNLOAD); + return GRUB_ERR_NONE; + + fail: + + if (file) + grub_file_close (file); + + grub_pxechain_unload (); + + return grub_errno; +} + +static grub_command_t cmd; + +GRUB_MOD_INIT(pxechainloader) +{ + cmd = grub_register_command ("pxechainloader", grub_cmd_pxechain, + 0, N_("Load a PXE image.")); + my_mod = mod; +} + +GRUB_MOD_FINI(pxechainloader) +{ + grub_unregister_command (cmd); +} |