97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2013 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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#include <grub/xen_file.h>
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#include <grub/i386/linux.h>
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#include <grub/misc.h>
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grub_elf_t
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grub_xen_file (grub_file_t file)
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{
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grub_elf_t elf;
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struct linux_kernel_header lh;
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grub_file_t off_file;
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elf = grub_elf_file (file, file->name);
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if (elf)
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return elf;
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grub_errno = GRUB_ERR_NONE;
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if (grub_file_seek (file, 0) == (grub_off_t) -1)
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goto fail;
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if (grub_file_read (file, &lh, sizeof (lh)) != sizeof (lh))
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goto fail;
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if (lh.boot_flag != grub_cpu_to_le16_compile_time (0xaa55)
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|| lh.header != grub_cpu_to_le32_compile_time (GRUB_LINUX_MAGIC_SIGNATURE)
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|| grub_le_to_cpu16 (lh.version) < 0x0208)
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{
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grub_error (GRUB_ERR_BAD_OS, "version too old for xen boot");
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return NULL;
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}
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if (lh.payload_length < 4)
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{
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grub_error (GRUB_ERR_BAD_OS, "payload too short");
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return NULL;
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}
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grub_dprintf ("xen", "found bzimage payload 0x%llx-0x%llx\n",
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(unsigned long long) (lh.setup_sects + 1) * 512
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+ lh.payload_offset,
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(unsigned long long) lh.payload_length);
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off_file = grub_file_offset_open (file, (lh.setup_sects + 1) * 512
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+ lh.payload_offset,
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lh.payload_length);
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if (!off_file)
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goto fail;
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elf = grub_elf_file (off_file, file->name);
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if (elf)
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return elf;
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grub_file_offset_close (off_file);
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fail:
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grub_error (GRUB_ERR_BAD_OS, "not xen image");
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return NULL;
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}
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grub_err_t
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grub_xen_get_info (grub_elf_t elf, struct grub_xen_file_info * xi)
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{
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grub_memset (xi, 0, sizeof (*xi));
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if (grub_elf_is_elf64 (elf)
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&& elf->ehdr.ehdr64.e_machine
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== grub_cpu_to_le16_compile_time (EM_X86_64)
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&& elf->ehdr.ehdr64.e_ident[EI_DATA] == ELFDATA2LSB)
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{
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xi->arch = GRUB_XEN_FILE_X86_64;
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return grub_xen_get_info64 (elf, xi);
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}
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if (grub_elf_is_elf32 (elf)
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&& elf->ehdr.ehdr32.e_machine == grub_cpu_to_le16_compile_time (EM_386)
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&& elf->ehdr.ehdr32.e_ident[EI_DATA] == ELFDATA2LSB)
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{
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xi->arch = GRUB_XEN_FILE_I386;
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return grub_xen_get_info32 (elf, xi);
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}
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return grub_error (GRUB_ERR_BAD_OS, "unknown ELF type");
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}
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