diff options
Diffstat (limited to 'grub-core/loader/mips/linux.c')
| -rw-r--r-- | grub-core/loader/mips/linux.c | 443 |
1 files changed, 443 insertions, 0 deletions
diff --git a/grub-core/loader/mips/linux.c b/grub-core/loader/mips/linux.c new file mode 100644 index 0000000..0bf7b1f --- /dev/null +++ b/grub-core/loader/mips/linux.c @@ -0,0 +1,443 @@ +/* linux.c - boot Linux */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2003,2004,2005,2007,2009,2010 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/elf.h> +#include <grub/elfload.h> +#include <grub/loader.h> +#include <grub/dl.h> +#include <grub/mm.h> +#include <grub/misc.h> +#include <grub/command.h> +#include <grub/mips/relocator.h> +#include <grub/memory.h> +#include <grub/i18n.h> + +GRUB_MOD_LICENSE ("GPLv3+"); + +/* For frequencies. */ +#include <grub/pci.h> +#include <grub/machine/time.h> + +#ifdef GRUB_MACHINE_MIPS_YEELOONG +/* This can be detected on runtime from PMON, but: + a) it wouldn't work when GRUB is the firmware + and + b) for now we only support Yeeloong anyway. */ +#define LOONGSON_MACHTYPE "machtype=lemote-yeeloong-2f-8.9inches" +#endif + +static grub_dl_t my_mod; + +static int loaded; + +static grub_size_t linux_size; + +static struct grub_relocator *relocator; +static grub_uint8_t *playground; +static grub_addr_t target_addr, entry_addr; +static int linux_argc; +static grub_off_t argv_off, envp_off; +static grub_off_t rd_addr_arg_off, rd_size_arg_off; +static int initrd_loaded = 0; + +static grub_err_t +grub_linux_boot (void) +{ + struct grub_relocator32_state state; + + /* Boot the kernel. */ + state.gpr[1] = entry_addr; + state.gpr[4] = linux_argc; + state.gpr[5] = target_addr + argv_off; + state.gpr[6] = target_addr + envp_off; + state.jumpreg = 1; + grub_relocator32_boot (relocator, state); + + return GRUB_ERR_NONE; +} + +static grub_err_t +grub_linux_unload (void) +{ + grub_relocator_unload (relocator); + grub_dl_unref (my_mod); + + loaded = 0; + + return GRUB_ERR_NONE; +} + +static grub_err_t +grub_linux_load32 (grub_elf_t elf, void **extra_mem, grub_size_t extra_size) +{ + Elf32_Addr base; + int extraoff; + grub_err_t err; + + /* Linux's entry point incorrectly contains a virtual address. */ + entry_addr = elf->ehdr.ehdr32.e_entry; + + linux_size = grub_elf32_size (elf, &base, 0); + if (linux_size == 0) + return grub_errno; + target_addr = base; + /* Pad it; the kernel scribbles over memory beyond its load address. */ + linux_size += 0x100000; + linux_size = ALIGN_UP (base + linux_size, 4) - base; + extraoff = linux_size; + linux_size += extra_size; + + relocator = grub_relocator_new (); + if (!relocator) + return grub_errno; + + { + grub_relocator_chunk_t ch; + err = grub_relocator_alloc_chunk_addr (relocator, &ch, + target_addr & 0x1fffffff, + linux_size); + if (err) + return err; + playground = get_virtual_current_address (ch); + } + + *extra_mem = playground + extraoff; + + /* Now load the segments into the area we claimed. */ + auto grub_err_t offset_phdr (Elf32_Phdr *phdr, grub_addr_t *addr, int *do_load); + grub_err_t offset_phdr (Elf32_Phdr *phdr, grub_addr_t *addr, int *do_load) + { + if (phdr->p_type != PT_LOAD) + { + *do_load = 0; + return 0; + } + *do_load = 1; + + /* Linux's program headers incorrectly contain virtual addresses. + * Translate those to physical, and offset to the area we claimed. */ + *addr = (grub_addr_t) (phdr->p_paddr - base + playground); + return 0; + } + return grub_elf32_load (elf, offset_phdr, 0, 0); +} + +static grub_err_t +grub_linux_load64 (grub_elf_t elf, void **extra_mem, grub_size_t extra_size) +{ + Elf64_Addr base; + int extraoff; + grub_err_t err; + + /* Linux's entry point incorrectly contains a virtual address. */ + entry_addr = elf->ehdr.ehdr64.e_entry; + + linux_size = grub_elf64_size (elf, &base, 0); + if (linux_size == 0) + return grub_errno; + target_addr = base; + /* Pad it; the kernel scribbles over memory beyond its load address. */ + linux_size += 0x100000; + linux_size = ALIGN_UP (base + linux_size, 4) - base; + extraoff = linux_size; + linux_size += extra_size; + + relocator = grub_relocator_new (); + if (!relocator) + return grub_errno; + + { + grub_relocator_chunk_t ch; + err = grub_relocator_alloc_chunk_addr (relocator, &ch, + target_addr & 0x1fffffff, + linux_size); + if (err) + return err; + playground = get_virtual_current_address (ch); + } + + *extra_mem = playground + extraoff; + + /* Now load the segments into the area we claimed. */ + auto grub_err_t offset_phdr (Elf64_Phdr *phdr, grub_addr_t *addr, int *do_load); + grub_err_t offset_phdr (Elf64_Phdr *phdr, grub_addr_t *addr, int *do_load) + { + if (phdr->p_type != PT_LOAD) + { + *do_load = 0; + return 0; + } + *do_load = 1; + /* Linux's program headers incorrectly contain virtual addresses. + * Translate those to physical, and offset to the area we claimed. */ + *addr = (grub_addr_t) (phdr->p_paddr - base + playground); + return 0; + } + return grub_elf64_load (elf, offset_phdr, 0, 0); +} + +static grub_err_t +grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)), + int argc, char *argv[]) +{ + grub_elf_t elf = 0; + int i; + int size; + void *extra = NULL; + grub_uint32_t *linux_argv, *linux_envp; + char *linux_args, *linux_envs; + grub_err_t err; + + if (argc == 0) + return grub_error (GRUB_ERR_BAD_ARGUMENT, "no kernel specified"); + + elf = grub_elf_open (argv[0]); + if (! elf) + return grub_errno; + + if (elf->ehdr.ehdr32.e_type != ET_EXEC) + { + grub_elf_close (elf); + return grub_error (GRUB_ERR_UNKNOWN_OS, + "this ELF file is not of the right type\n"); + } + + /* Release the previously used memory. */ + grub_loader_unset (); + loaded = 0; + + /* For arguments. */ + linux_argc = argc; +#ifdef LOONGSON_MACHTYPE + linux_argc++; +#endif + /* Main arguments. */ + size = (linux_argc) * sizeof (grub_uint32_t); + /* Initrd address and size. */ + size += 2 * sizeof (grub_uint32_t); + /* NULL terminator. */ + size += sizeof (grub_uint32_t); + + /* First argument is always "a0". */ + size += ALIGN_UP (sizeof ("a0"), 4); + /* Normal arguments. */ + for (i = 1; i < argc; i++) + size += ALIGN_UP (grub_strlen (argv[i]) + 1, 4); +#ifdef LOONGSON_MACHTYPE + size += ALIGN_UP (sizeof (LOONGSON_MACHTYPE), 4); +#endif + + /* rd arguments. */ + size += ALIGN_UP (sizeof ("rd_start=0xXXXXXXXXXXXXXXXX"), 4); + size += ALIGN_UP (sizeof ("rd_size=0xXXXXXXXXXXXXXXXX"), 4); + + /* For the environment. */ + size += sizeof (grub_uint32_t); + size += 4 * sizeof (grub_uint32_t); + size += ALIGN_UP (sizeof ("memsize=XXXXXXXXXXXXXXXXXXXX"), 4) + + ALIGN_UP (sizeof ("highmemsize=XXXXXXXXXXXXXXXXXXXX"), 4) + + ALIGN_UP (sizeof ("busclock=XXXXXXXXXX"), 4) + + ALIGN_UP (sizeof ("cpuclock=XXXXXXXXXX"), 4); + + if (grub_elf_is_elf32 (elf)) + err = grub_linux_load32 (elf, &extra, size); + else + if (grub_elf_is_elf64 (elf)) + err = grub_linux_load64 (elf, &extra, size); + else + err = grub_error (GRUB_ERR_BAD_FILE_TYPE, "unknown ELF class"); + + grub_elf_close (elf); + + if (err) + return err; + + linux_argv = extra; + argv_off = (grub_uint8_t *) linux_argv - (grub_uint8_t *) playground; + extra = linux_argv + (linux_argc + 1 + 2); + linux_args = extra; + + grub_memcpy (linux_args, "a0", sizeof ("a0")); + *linux_argv = (grub_uint8_t *) linux_args - (grub_uint8_t *) playground + + target_addr; + linux_argv++; + linux_args += ALIGN_UP (sizeof ("a0"), 4); + +#ifdef LOONGSON_MACHTYPE + /* In Loongson platform, it is the responsibility of the bootloader/firmware + to supply the OS kernel with machine type information. */ + grub_memcpy (linux_args, LOONGSON_MACHTYPE, sizeof (LOONGSON_MACHTYPE)); + *linux_argv = (grub_uint8_t *) linux_args - (grub_uint8_t *) playground + + target_addr; + linux_argv++; + linux_args += ALIGN_UP (sizeof (LOONGSON_MACHTYPE), 4); +#endif + + for (i = 1; i < argc; i++) + { + grub_memcpy (linux_args, argv[i], grub_strlen (argv[i]) + 1); + *linux_argv = (grub_uint8_t *) linux_args - (grub_uint8_t *) playground + + target_addr; + linux_argv++; + linux_args += ALIGN_UP (grub_strlen (argv[i]) + 1, 4); + } + + /* Reserve space for rd arguments. */ + rd_addr_arg_off = (grub_uint8_t *) linux_args - (grub_uint8_t *) playground; + linux_args += ALIGN_UP (sizeof ("rd_start=0xXXXXXXXXXXXXXXXX"), 4); + *linux_argv = 0; + linux_argv++; + + rd_size_arg_off = (grub_uint8_t *) linux_args - (grub_uint8_t *) playground; + linux_args += ALIGN_UP (sizeof ("rd_size=0xXXXXXXXXXXXXXXXX"), 4); + *linux_argv = 0; + linux_argv++; + + *linux_argv = 0; + + extra = linux_args; + + linux_envp = extra; + envp_off = (grub_uint8_t *) linux_envp - (grub_uint8_t *) playground; + linux_envs = (char *) (linux_envp + 5); + grub_snprintf (linux_envs, sizeof ("memsize=XXXXXXXXXXXXXXXXXXXX"), + "memsize=%lld", + (unsigned long long) grub_mmap_get_lower () >> 20); + linux_envp[0] = (grub_uint8_t *) linux_envs - (grub_uint8_t *) playground + + target_addr; + linux_envs += ALIGN_UP (grub_strlen (linux_envs) + 1, 4); + grub_snprintf (linux_envs, sizeof ("highmemsize=XXXXXXXXXXXXXXXXXXXX"), + "highmemsize=%lld", + (unsigned long long) grub_mmap_get_upper () >> 20); + linux_envp[1] = (grub_uint8_t *) linux_envs - (grub_uint8_t *) playground + + target_addr; + linux_envs += ALIGN_UP (grub_strlen (linux_envs) + 1, 4); + + grub_snprintf (linux_envs, sizeof ("busclock=XXXXXXXXXX"), + "busclock=%d", grub_arch_busclock); + linux_envp[2] = (grub_uint8_t *) linux_envs - (grub_uint8_t *) playground + + target_addr; + linux_envs += ALIGN_UP (grub_strlen (linux_envs) + 1, 4); + grub_snprintf (linux_envs, sizeof ("cpuclock=XXXXXXXXXX"), + "cpuclock=%d", grub_arch_cpuclock); + linux_envp[3] = (grub_uint8_t *) linux_envs - (grub_uint8_t *) playground + + target_addr; + linux_envs += ALIGN_UP (grub_strlen (linux_envs) + 1, 4); + + + linux_envp[4] = 0; + + grub_loader_set (grub_linux_boot, grub_linux_unload, 1); + initrd_loaded = 0; + loaded = 1; + grub_dl_ref (my_mod); + + return GRUB_ERR_NONE; +} + +static grub_err_t +grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)), + int argc, char *argv[]) +{ + grub_file_t file = 0; + grub_ssize_t size; + void *initrd_src; + grub_addr_t initrd_dest; + grub_err_t err; + + if (argc == 0) + return grub_error (GRUB_ERR_BAD_ARGUMENT, "no initrd specified"); + + if (!loaded) + return grub_error (GRUB_ERR_BAD_ARGUMENT, "you need to load Linux first."); + + if (initrd_loaded) + return grub_error (GRUB_ERR_BAD_ARGUMENT, "only one initrd can be loaded."); + + grub_file_filter_disable_compression (); + file = grub_file_open (argv[0]); + if (! file) + return grub_errno; + + size = grub_file_size (file); + + { + grub_relocator_chunk_t ch; + + err = grub_relocator_alloc_chunk_align (relocator, &ch, + (target_addr & 0x1fffffff) + + linux_size + 0x10000, + (0x10000000 - size), + size, 0x10000, + GRUB_RELOCATOR_PREFERENCE_NONE); + + if (err) + { + grub_file_close (file); + return err; + } + initrd_src = get_virtual_current_address (ch); + initrd_dest = get_physical_target_address (ch) | 0x80000000; + } + + if (grub_file_read (file, initrd_src, size) != size) + { + grub_error (GRUB_ERR_FILE_READ_ERROR, "couldn't read file"); + grub_file_close (file); + + return grub_errno; + } + + grub_snprintf ((char *) playground + rd_addr_arg_off, + sizeof ("rd_start=0xXXXXXXXXXXXXXXXX"), "rd_start=0x%llx", + (unsigned long long) initrd_dest); + ((grub_uint32_t *) (playground + argv_off))[linux_argc] + = target_addr + rd_addr_arg_off; + linux_argc++; + + grub_snprintf ((char *) playground + rd_size_arg_off, + sizeof ("rd_size=0xXXXXXXXXXXXXXXXXX"), "rd_size=0x%llx", + (unsigned long long) size); + ((grub_uint32_t *) (playground + argv_off))[linux_argc] + = target_addr + rd_size_arg_off; + linux_argc++; + + initrd_loaded = 1; + + grub_file_close (file); + + return GRUB_ERR_NONE; +} + +static grub_command_t cmd_linux, cmd_initrd; + +GRUB_MOD_INIT(linux) +{ + cmd_linux = grub_register_command ("linux", grub_cmd_linux, + 0, N_("Load Linux.")); + cmd_initrd = grub_register_command ("initrd", grub_cmd_initrd, + 0, N_("Load initrd.")); + my_mod = mod; +} + +GRUB_MOD_FINI(linux) +{ + grub_unregister_command (cmd_linux); + grub_unregister_command (cmd_initrd); +} |