/* linux.c - boot Linux */ /* * GRUB -- GRand Unified Bootloader * Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc. * * 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 * (at your option) 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include #include #include #include #include #include #include static grub_dl_t my_mod; static int loaded; static int vmlinux; static grub_addr_t initrd_addr; static grub_size_t initrd_size; static grub_addr_t linux_addr; static grub_size_t linux_size; static char *linux_args; typedef void (*kernel_entry_t) (void *, unsigned long, intptr_t (void *), unsigned long, unsigned long); static grub_err_t grub_linux_boot (void) { kernel_entry_t linuxmain; grub_ieee1275_phandle_t chosen; grub_size_t actual; grub_ieee1275_finddevice ("/chosen", &chosen); /* Set the command line arguments. */ grub_ieee1275_set_property (chosen, "bootargs", linux_args, grub_strlen (linux_args) + 1, &actual); /* Boot the kernel. */ linuxmain = (kernel_entry_t) linux_addr; linuxmain ((void *) initrd_addr, initrd_size, grub_ieee1275_entry_fn, 0, 0); return GRUB_ERR_NONE; } static grub_err_t grub_linux_release_mem (void) { grub_free (linux_args); linux_args = 0; if (linux_addr && grub_ieee1275_release (linux_addr, linux_size)) return grub_error (GRUB_ERR_OUT_OF_MEMORY, "Can not release memory"); if (initrd_addr && grub_ieee1275_release (initrd_addr, initrd_size)) return grub_error (GRUB_ERR_OUT_OF_MEMORY, "Can not release memory"); linux_addr = 0; initrd_addr = 0; return GRUB_ERR_NONE; } static grub_err_t grub_linux_unload (void) { grub_err_t err; err = grub_linux_release_mem (); grub_dl_unref (my_mod); loaded = 0; return err; } void grub_rescue_cmd_linux (int argc, char *argv[]) { grub_file_t file = 0; Elf32_Ehdr ehdr; Elf32_Phdr *phdrs = 0; int i; int offset = 0; grub_addr_t entry; int found_addr = 0; int size; grub_dl_ref (my_mod); if (argc == 0) { grub_error (GRUB_ERR_BAD_ARGUMENT, "no kernel specified"); goto fail; } file = grub_file_open (argv[0]); if (! file) goto fail; if (grub_file_read (file, (char *) &ehdr, sizeof (ehdr)) != sizeof (ehdr)) { grub_error (GRUB_ERR_READ_ERROR, "cannot read the linux elf header"); goto fail; } if (grub_dl_check_header (&ehdr, sizeof(ehdr))) { grub_error (GRUB_ERR_UNKNOWN_OS, "No valid ELF header found"); goto fail; } if (ehdr.e_type != ET_EXEC) { grub_error (GRUB_ERR_UNKNOWN_OS, "This ELF file is not of the right type\n"); goto fail; } /* Read the sections. */ entry = ehdr.e_entry; if (entry == 0xc0000000) { entry = 0x01400000; vmlinux = 1; } else vmlinux = 0; phdrs = (Elf32_Phdr *) grub_malloc (ehdr.e_phnum * ehdr.e_phentsize); grub_file_read (file, (void *) phdrs, ehdr.e_phnum * ehdr.e_phentsize); /* Release the previously used memory. */ grub_loader_unset (); /* Determine the amount of memory that is required. */ linux_size = 0; for (i = 0; i < ehdr.e_phnum; i++) { Elf32_Phdr *phdr = phdrs + i; /* XXX: Is this calculation correct? */ linux_size += phdr->p_memsz + phdr->p_filesz; } /* Reserve memory for the kernel. */ linux_size += 0x100000; /* For some vmlinux kernels the address set above won't work. Just try some other addresses just like yaboot does. */ for (linux_addr = entry; linux_addr < entry + 200 * 0x100000; linux_addr += 0x100000) { found_addr = grub_claimmap (linux_addr, linux_size); if (found_addr != -1) break; } if (found_addr == -1) { grub_error (GRUB_ERR_OUT_OF_MEMORY, "Can not claim memory"); goto fail; } entry = linux_addr; /* Load every loadable segment in memory. */ for (i = 0; i < ehdr.e_phnum; i++) { Elf32_Phdr *phdr = phdrs + i; if (phdr->p_type == PT_LOAD) { if (grub_file_seek (file, phdr->p_offset) == -1) { grub_error (GRUB_ERR_BAD_OS, "Invalid offset in program header"); goto fail; } if (grub_file_read (file, (void *) (((char *) entry) + offset) , phdr->p_filesz) != (grub_ssize_t) phdr->p_filesz) goto fail; if (phdr->p_filesz < phdr->p_memsz) grub_memset ((char *) (((char *) entry) + offset) + phdr->p_filesz, 0, phdr->p_memsz - phdr->p_filesz); offset += phdr->p_filesz; } } size = 0; for (i = 0; i < argc; i++) size += grub_strlen (argv[i]); linux_args = grub_malloc (size + argc + 1); if (!linux_args) goto fail; for (i = 1; i < argc; i++) { grub_strcat (linux_args, argv[i]); grub_strcat (linux_args, " "); } fail: if (file) grub_file_close (file); grub_free (phdrs); if (grub_errno != GRUB_ERR_NONE) { grub_linux_release_mem (); grub_dl_unref (my_mod); loaded = 0; } else { grub_loader_set (grub_linux_boot, grub_linux_unload); initrd_addr = 0xc0000000; loaded = 1; } return; } void grub_rescue_cmd_initrd (int argc, char *argv[]) { grub_file_t file = 0; grub_ssize_t size; grub_addr_t addr; if (argc == 0) { grub_error (GRUB_ERR_BAD_ARGUMENT, "no initrd specified"); goto fail; } if (!loaded) { grub_error (GRUB_ERR_BAD_ARGUMENT, "You need to load the kernel first."); goto fail; } file = grub_file_open (argv[0]); if (! file) goto fail; addr = linux_addr + linux_size; size = grub_file_size (file); if (grub_claimmap (addr, size) == -1) { grub_error (GRUB_ERR_OUT_OF_MEMORY, "Can not claim memory"); goto fail; } if (grub_file_read (file, (void *) addr, size) != size) { grub_ieee1275_release (addr, size); grub_error (GRUB_ERR_FILE_READ_ERROR, "Couldn't read file"); goto fail; } initrd_addr = addr; initrd_size = size; fail: if (file) grub_file_close (file); } GRUB_MOD_INIT { grub_rescue_register_command ("linux", grub_rescue_cmd_linux, "load a linux kernel"); grub_rescue_register_command ("initrd", grub_rescue_cmd_initrd, "load an initrd"); my_mod = mod; } GRUB_MOD_FINI { grub_rescue_unregister_command ("linux"); grub_rescue_unregister_command ("initrd"); }