Let user specify NetBSD root device.
* loader/i386/bsd.c (netbsd_root): New variable.
(netbsd_opts): New option 'root'.
(NETBSD_ROOT_ARG): New macro.
(grub_netbsd_boot): Use 'netbsd_root'.
(grub_bsd_unload): Free 'netbsd_root'.
(grub_cmd_netbsd): Fill 'netbsd_root'.
Support --no-smp and --no-acpi for NetBSD.
* include/grub/i386/bsd.h (NETBSD_AB_NOSMP): New definition.
(NETBSD_AB_NOACPI): Likewise.
* loader/i386/bsd.c (netbsd_opts): New entries no-smp and no-acpi.
(netbsd_flags): Add NETBSD_AB_NOSMP, NETBSD_AB_NOACPI.
* loader/i386/bsd.c (freebsd_opts): Rewritten to use extcmd.
(openbsd_opts): Likewise.
(netbsd_opts): Likewise.
(freebsd_flags): Added 0 terminator.
(openbsd_flags): Likewise.
(netbsd_flags): Likewise.
(grub_bsd_parse_flags): Rewritten to use extcmd. All users updated.
(grub_cmd_freebsd): Transformed into extended command.
(grub_cmd_openbsd): Likewise.
(grub_cmd_netbsd): Likewise.
(cmd_freebsd): Changed type to grub_extcmd_t.
(cmd_openbsd): Likewise.
(cmd_netbsd): Likewise.
(GRUB_MOD_INIT (bsd)): Register grub_cmd_freebsd, grub_cmd_netbsd and
grub_cmd_openbsd as extended commands.
(GRUB_MOD_FINI (bsd)): Use grub_unregister_extcmd for cmd_freebsd,
cmd_netbsd and cmd_openbsd
* loader/i386/linux.c (GRUB_ASSUME_LINUX_HAS_FB_SUPPORT)
(DEFAULT_VIDEO_MODE): Remove macros.
(grub_linux_boot): Remove assumption that Linux has FB support,
and use "text" as default video mode.
Framebuffer split.
* commands/i386/pc/vbetest.c (grub_cmd_vbetest): Restore video
subsystem at the end.
* conf/common.rmk (pkglib_MODULES): Add video_fb.mod.
(video_fb_mod_SOURCES): New variable.
(video_fb_mod_CFLAGS): Likewise.
(video_fb_mod_LDFLAGS): Likewise.
* conf/i386-pc.rmk (vbe_mod_SOURCES): Remove video/i386/pc/vbeblit.c,
video/i386/pc/vbefill.c and video/i386/pc/vbeutil.c.
* video/i386/pc/vbeblit.c: Moved from here ...
* video/fb/fbblit.c: ..here. Replaced 'vbe' with 'fb'.
* video/i386/pc/vbefill.c: Moved from here ...
* video/fb/fbfill.c: ..here. Replaced 'vbe' with 'fb'.
* video/i386/pc/vbeutil.c: Moved from here ...
* video/fb/fbutil.c: ..here. Replaced 'vbe' with 'fb'.
* include/grub/i386/pc/vbeblit.h: Moved from here ...
* include/grub/fbblit.h: ... here. Replaced 'vbe' with 'fb'.
* include/grub/i386/pc/vbefill.h: Moved from here ...
* include/grub/fbfill.h: ... here. Replaced 'vbe' with 'fb'.
* include/grub/i386/pc/vbeutil.h: Moved from here ...
* include/grub/fbutil.h: ... here. Replaced 'vbe' with 'fb'.
* include/grub/i386/pc/vbe.h: Moved framebuffer part ...
* include/grub/video_fb.h: ... here. Replaced 'vbe' with 'fb'.
* include/grub/video.h (GRUB_VIDEO_RENDER_TARGET_FRONT_BUFFER): Removed.
(GRUB_VIDEO_RENDER_TARGET_BACK_BUFFER): Likewise.
(grub_video_adapter): Added 'get_info_and_fini'.
(grub_video_get_info_and_fini): New prototype.
(grub_video_set_mode): make modestring const char *.
* loader/i386/linux.c (grub_linux_setup_video): Use
grub_video_get_info_and_fini.
(grub_linux_boot): Move modesetting just before booting.
* loader/i386/pc/xnu.c (grub_xnu_set_video): Use
grub_video_get_info_and_fini.
* video/i386/pc/vbe.c: Moved framebuffer part ...
* video/fb/video_fb.c: ... here. Replaced 'vbe' with 'fb'.
* video/i386/pc/vbe.c (grub_vbe_set_video_mode): Use
grub_video_fbstd_colors and grub_video_fb_set_palette.
(grub_video_vbe_init): Clear 'framebuffer' variable and use
grub_video_fb_init.
(grub_video_vbe_fini): Use grub_video_fb_fini.
(grub_video_vbe_setup): Use framebuffer.render_target instead of
render_target and use grub_video_fb_set_active_render_target and
grub_video_fb_set_palette.
(grub_video_vbe_set_palette): Use grub_video_fb_set_palette.
(grub_video_vbe_set_viewport): Use grub_video_fb_set_viewport.
(grub_video_vbe_adapter): Use framebuffer.
* video/video.c (grub_video_get_info_and_fini): New function.
(grub_video_set_mode): Make modestring const char *.
(GRUB_MOD_INIT(video_video)): Don't set variables to 0 since these
values are already initialised.
* include/grub/i386/bsd.h (KERNEL_TYPE_NONE, KERNEL_TYPE_FREEBSD)
(KERNEL_TYPE_OPENBSD, KERNEL_TYPE_NETBSD): Convert to ...
(bsd_kernel_types): ... this enum.
* loader/i386/bsd.c (grub_cmd_freebsd_loadenv, grub_cmd_freebsd_module)
(grub_cmd_freebsd_module_elf): Abort with "You need to load the
kernel first." when `kernel_type' is set to KERNEL_TYPE_NONE.
(grub_bsd_load_aout, grub_bsd_load, grub_cmd_freebsd_loadenv)
(grub_cmd_freebsd_module, grub_cmd_freebsd_module_elf)
(GRUB_MOD_INIT (bsd)): Fix capitalization in a few error
messages.
* loader/i386/linux.c (grub_cmd_linux): Use ',' rather than ';' as
separator for the suggested gfxpayload string (';' collides with the
parser and needs escaping).
* loader/i386/multiboot_helper.S (grub_multiboot_backward_relocator):
Clear direction flag before jumping to OS.
(grub_multiboot2_real_boot): Likewise.
* include/grub/i386/linux.h (GRUB_VIDEO_TYPE_TEXT): New macro.
* loader/i386/linux.c [__i386__] (grub_linux_boot): Simplify inline
assembly in final jump, using register constraints.
(grub_linux_boot): For text mode, initialize `have_vga' using
GRUB_VIDEO_TYPE_TEXT rather than 0 (this changes its value to 1).
Initialize `video_cursor_x' and `video_cursor_y' as late as possible,
right before the final jump.
Set `video_mode' to 0x3.
Document initialization of `video_page', `video_mode' and
`video_ega_bx'.
* include/grub/i386/linux.h (GRUB_LINUX_FLAG_QUIET): New macro.
* loader/i386/linux.c (grub_cmd_linux): Recognize "quiet" option,
and set GRUB_LINUX_FLAG_QUIET appropiately.
Load BSD ELF modules
* conf/i386-pc.rmk (bsd_mod_SOURCES): Add loader/i386/bsd32.c
and loader/i386/bsd64.c
* include/grub/i386/bsd.h (FREEBSD_MODTYPE_MODULE): Remove
(FREEBSD_MODTYPE_ELF_MODULE): New definition
(FREEBSD_MODTYPE_ELF_MODULE_OBJ): Likewise
(grub_freebsd_load_elfmodule32): New declaration
(grub_freebsd_load_elfmoduleobj64): Likewise
(grub_freebsd_load_elf_meta32): Likewise
(grub_freebsd_load_elf_meta64): Likewise
(grub_freebsd_add_meta): Likewise
(grub_freebsd_add_meta_module): Likewise
* loader/i386/bsd.c (grub_freebsd_add_meta): Make global
(grub_freebsd_add_meta_module): Likewise and move module-specific
parts to grub_cmd_freebsd and grub_cmd_freebsd_module
(grub_cmd_freebsd): Add elf-kernel specific parts
based on grub_freebsd_add_meta_module
(grub_cmd_freebsd_module): Add type parsing moved from
grub_freebsd_add_meta_module
(grub_cmd_freebsd_module_elf): New function
(cmd_freebsd_module_elf): New variable
(GRUB_MOD_INIT): Register freebsd_module_elf
* loader/i386/bsd32.c: New file
* loader/i386/bsd64.c: Likewise
* loader/i386/bsdXX.c: Likewise
* kern/elf.c (grub_elf32_load): Let hook decide which pheaders to load
(grub_elf64_load): Likewise
* include/grub/elfload.h (grub_elf32_load_hook_t): New parameter do_load
All users updated
(grub_elf64_load_hook_t): Likewise
* include/grub/multiboot2.h: Provide compatibility defines for
multiboot2.h.
* include/multiboot2.h: Include stdint.h only if needed, using
angle brackets.
* loader/i386/pc/multiboot2.c: Include multiboot2.h after
grub/multiboot2.h.
* loader/ieee1275/multiboot2.c: Likewise.
* loader/multiboot2.c: Likewise.
* loader/multiboot_loader.c: Likewise.
Address in trampolines based on 32-bit registers when compiled
with Apple's CC
* loader/i386/xnu_helper.S [APPLE_CC]: use 32-bit registers
for addresses
* loader/i386/linux_trampoline.S [APPLE_CC]: likewise
Avoid clobbering %ebx/%rbx in inline assembly with Apple's CC
* efiemu/runtime/efiemu.c (write_cmos): use %cl instead of %bl as
temporary storage
* include/grub/i386/tsc.h (grub_get_tsc): restore %rbx/%ebx when
using Apple's CC
(grub_cpu_is_tsc_supported): likewise
* loader/i386/xnu.c (guessfsb): restore %rbx/%ebx in inline assembly
gfxpayload support
* commands/videotest.c (grub_cmd_videotest): use grub_video_set_mode
* include/grub/video.h (GRUB_VIDEO_MODE_TYPE_PURE_TEXT): new definition
(grub_video_setup): remove
(grub_video_set_mode): new prototype
* loader/i386/linux.c (DEFAULT_VIDEO_MODE): new definition
(vid_mode): remove
(linux_vesafb_res): compile only on PCBIOS
(grub_linux_boot): support gfxpayload
* loader/i386/pc/xnu.c (video_hook): new function
(grub_xnu_set_video): support gfxpayload
* term/gfxterm.c (DEFAULT_VIDEO_WIDTH): removed
(DEFAULT_VIDEO_HEIGHT): likewise
(DEFAULT_VIDEO_FLAGS): likewise
(DEFAULT_VIDEO_MODE): new definition
(video_hook): new function
(grub_gfxterm_init): use grub_video_set_mode
* util/grub.d/30_os-prober.in: remove explicit modesetting before
loading xnu
* video/video.c (grub_video_setup): removed
(grub_video_set_mode): new function based on grub_gfxterm_init and
grub_video_setup
trampoline for linux on 64-bit platform
* conf/x86_64-efi.rmk (linux_mod_SOURCES): added
loader/i386/efi/linux_trampoline.S
* include/grub/x86_64/efi/loader.h (grub_linux_real_boot): removed
declration
* kern/x86_64/efi/startup.S (grub_linux_real_boot): moved from here
* loader/i386/linux_trampoline.S: moved here
* loader/i386/efi/linux.c (allocate_pages): reserve space for trampoline
(jumpvector): removed
(grub_linux_trampoline_start): new declaration
(grub_linux_trampoline_end): likewise
(grub_linux_boot): use trampoline when on 64-bit platform
* loader/i386/linux.c: likewise
* loader/i386/linux.c (allocate_pages): When assigning
real_mode_mem, cast through grub_size_t to fix a warning. The
code already makes sure that the value would fit a pointer.
(grub_linux_setup_video): Cast render_target->data to
grub_size_t to fix a warning.
* kernel/disk.c (grub_disk_read): Use void pointer for the
buffer.
(grub_disk_write): Use const void pointer for the buffer.
Adjust all callers. Remove unnecessary casts.
* include/grub/i386/linux.h (GRUB_LINUX_VID_MODE_VESA_START): Set
to 0x300.
* loader/i386/linux.c (vga_modes, linux_vesafb_res): Add a few
resolutions.
(linux_vesafb_modes): Add a lot of additional modes to the list (based
on documentation from Wikipedia).
* loader/i386/linux.c (GRUB_ASSUME_LINUX_HAS_FB_SUPPORT): New macro.
(grub_linux_boot): Don't check for `linux_vesafb_modes' bounds (this
is done by grub_cmd_linux() now).
[! GRUB_ASSUME_LINUX_HAS_FB_SUPPORT]: If "vga=" parameter wasn't set,
restore video to text mode.
(grub_cmd_linux): Default `vid_mode' initialization to 0, which
indicates lack of "vga=" parameter. "vga=0" is mapped to
`GRUB_LINUX_VID_MODE_NORMAL'.
FreeBSD 64-bit support
* conf/i386-pc.rmk (bsd_mod_SOURCES): add loader/i386/bsd_helper.S
and loader/i386/bsd_trampoline.S
(bsd_mod_ASFLAGS): new variable
* include/grub/i386/bsd.h (FREEBSD_MODINFOMD_SMAP): new definition
(FREEBSD_MODTYPE_KERNEL64): likewise
(grub_bsd64_trampoline_start): likewise
(grub_bsd64_trampoline_end): likewise
(grub_bsd64_trampoline_selfjump): likewise
(grub_bsd64_trampoline_gdt): likewise
* include/grub/i386/loader.h (grub_unix_real_boot): moved from here ...
* include/grub/i386/bsd.h (grub_unix_real_boot): ... moved here
* kern/i386/loader.S (grub_unix_real_boot): moved from here ...
* loader/i386/bsd_helper.S (grub_unix_real_boot): moved here
* include/grub/gpt_partition.h (grub_gpt_partentry): Corrected the type
of "attrib" member
* loader/i386/bsd_pagetable.c: new file
* loader/i386/bsd_trampoline.S: likewise
* loader/i386/bsd.c (ALIGN_QWORD): new macro
(ALIGN_VAR): likewise
(entry_hi): new variable
(kern_end_mdofs): likewise
(is_64bit): likewise
(grub_freebsd_add_meta): use ALIGN_VAR
(grub_e820_mmap): new declaration
(grub_freebsd_add_mmap): new function
(grub_freebsd_add_meta_module): support 64 bit kernels
(grub_freebsd_list_modules): use ALIGN_VAR
(gdt_descriptor): new declaration
(grub_freebsd_boot): support 64 bit kernels
(grub_bsd_elf64_hook): new function
(grub_bsd_load_elf): support elf64
* conf/common.rmk (grub_script.tab.c): Change normal/parser.y to
script/sh/parser.y.
(pkglib_MODULES): Add normal.mod and sh.mod.
(normal_SOURCES): New variable.
(normal_mod_CFLAGS): Likewise.
(normal_mod_LDFLAGS): Likewise.
(sh_mod_SOURCES): Likewise.
(sh_mod_CFLAGS): Likewise.
(sh_mod_LDFLAGS): Likewise.
* conf/i386-pc.rmk (normal/lexer.c_DEPENDENCIES): Changed to
script/sh/lexer.c_DEPENDENCIES.
(kernel_img_SOURCES): Remove kern/rescue.c, and kern/reader.c,
kern/rescue_reader.c and kern/rescue_parser.c.
(kernel_img_HEADERS): Remove rescue.h, add reader.h.
(grub_emu_SOURCES): Change source files.
(pkglib_MODULES): Remove normal.mod.
(normal_SOURCES): Removed.
(normal_mod_CFLAGS): Likewise.
(normal_mod_LDFLAGS): Likewise.
* conf/i386-coreboot.rmk: Likewise.
* conf/i386-efi.rmk: Likewise.
* conf/i386-ieee1276.rmk: Likewise.
* conf/powerpc-ieee1275.rmk: Likewise.
* conf/sparc64-ieee1275.rmk: Likewise.
* conf/x86_64-efi.rmk: Likewise.
* include/grub/command.h (grub_command_execute): New inline function.
* include/grub/menu.h (grub_menu_entry): Removed commands field.
* include/grub/normal.h: Remove <grub/setjmp.h>.
(grub_fs_module_list): Moved to normal/autofs.c.
(grub_exit_env): Removed.
(grub_command_execute): Likewise.
(grub_normal_menu_addentry): Renamed to grub_menu_addentry, removed
parameter script.
(read_command_list): New function declaration.
(read_fs_list): Likewise.
* include/parser.h: Include <grub/reader.h>.
(grub_parser_split_cmdline): Change type of getline parameter.
(grub_parser): New structure.
(grub_parser_class): New variable.
(grub_parser_execute): New function declaration.
(grub_register_rescue_parser): Likewise.
(grub_parser_register): New inline function.
(grub_parser_unregister): Likewise.
(grub_parser_get_current): Likewise.
(grub_parser_set_current): Likewise.
* include/grub/reader.h: New file.
* kern/reader.c: Likewise.
* kern/rescue_parser.c: Likewise.
* kern/rescue_reader.c: Likewise.
* normal/autofs.c: Likewise.
* normal/dyncmd.c: Likewise.
* include/grub/rescue.h: Removed.
* normal/command.h: Likewise.
* include/grub/script.h: Moved to ...
* include/grub/script_sh.h: ... Moved here.
* normal/execute.c: Moved to ...
* script/sh/execute.c: ... Moved here.
* normal/function.c: Moved to ...
* script/sh/function.c: ... Moved here.
* normal/lexer.c: Moved to ...
* script/sh/lexer.c: ... Moved here.
* normal/parser.y: Moved to ...
* script/sh/parser.y: ... Moved here.
* normal/script.c: Moved to ...
* script/sh/script.c: ... Moved here.
* normal/main.c: Remove <grub/rescue.h> and <grub/script.h>, include
<grub/reader.h>.
(grub_exit_env): Removed.
(fs_module_list): Moved to normal/autofs.c.
(grub_file_getline): Don't handle comment here.
(free_menu): Skip removed field entry->commands.
(grub_normal_menu_addentry): Removed as grub_menu_entry, removed
script parameter.
(read_config_file): Removed nested parameter, change getline function.
(grub_enter_normal_mode): Removed.
(grub_dyncmd_dispatcher): Moved to normal/dyncmd.c.
(read_command_list): Likewise.
(autoload_fs_module): Moved to normal/autofs.c.
(read_fs_list): Likewise.
(reader_nested): New variable.
(grub_normal_execute): Run parser.sh to switch to sh parser.
(grub_cmd_rescue): Removed.
(cmd_normal): Removed.
(grub_cmd_normal): Unregister itself at the beginning. Don't register
rescue command.
(grub_cmdline_run): New function.
(grub_normal_reader_init): Likewise.
(grub_normal_read_line): Likewise.
(grub_env_write_pager): Likewise.
(cmdline): New variable.
(grub_normal_reader): Likewise.
(GRUB_MOD_INIT): Register normal reader and set as current, register
pager hook, register normal command with grub_register_command_prio,
so that it won't show up in command.lst.
(GRUB_MOD_FINI): Unregister normal reader, unhook pager, clear
grub_fs_autoload_hook.
* normal/menu.c: Remove <grub/script.h>, add <grub/command.h>.
(grub_menu_execute_entry): Replace grub_script_execute with
grub_parser_execute, change parameter to grub_command_execute.
* normal/menu_text.c: Remove <grub/script.h>.
* normal/menu_entry.c: Remove <grub/script.h>, add <grub/command.h>
and <grub/parser.h>.
(run): Change editor_getline to use new parser interface. Change
parameter to grub_command_execute.
* kern/main.c: Remove <grub/rescue.h>, include <grub/command.h>,
<grub/reader.h> and <grub/parser.h>.
(grub_load_normal_mode): Execute normal command.
(grub_main): Call grub_register_core_commands,
grub_register_rescue_parser and grub_register_rescue_reader, use
grub_reader_loop to enter input loop.
* kern/parser.c (grub_parser_spli_cmdline): Change type of getline
parameter.
(grub_parser_class): New variable.
(grub_parser_execute): New function.
* loader/i386/multiboot.c: Remove <grub/rescue.h>.
* loader/multiboot2.c: Likewise.
* loader/sparc64/ieee1275/linux.c: Likewise.
* util/grub-emu.c (read_command_list): New dummy function.
* normal/menu_text.c (grub_wait_after_message): Print a newline
after waiting for user input.
* loader/i386/linux.c: Include `<grub/normal.h>'.
(grub_cmd_linux): Improve the error message about `ask' mode, by
waiting for user input so it's not missed (we can do this, since
user requested interaction).
* include/grub/misc.h (ARRAY_SIZE): New macro.
* include/grub/i386/linux.h (GRUB_LINUX_VID_MODE_VESA_START):
New macro.
* loader/i386/linux.c (allocate_pages): Use free_pages().
(grub_linux_unload): Don't use free_pages().
(grub_linux_boot): Prevent accessing linux_vesafb_modes with a
wrong index. Treat all other modes as text modes.
(grub_cmd_linux): Initialize vid_mode unconditionally to
GRUB_LINUX_VID_MODE_NORMAL. Recognize and support "vga=ask".
* loader/i386/linux.c (grub_linux_setup_video): Fill
`params->{red,green,blue,reserved}_{mask_size,field_pos}' with
values from `mode info' structure instead of hardcoded
values.
* loader/i386/linux.c (grub_cmd_linux): Check for zImage before
checking for abi version. Improve error messages on BIOS to notify
user about `linux16' command.
* loader/i386/linux.c (grub_cmd_linux): Parse "vga=" parameter and
set `vid_mode' accordingly.
(grub_linux_boot): Process `vid_mode' and set video mode.
Bugfixes in multiboot for bugs uncovered by solaris kernel.
* loader/i386/multiboot_elfxx.c (grub_multiboot_load_elf): Corrected
limit detection.
Use vaddr of correct segment for entry_point.
* loader/i386/linux.c: Include `<grub/video.h>' and
`<grub/i386/pc/vbe.h>'..
(grub_linux_setup_video): New function. Loosely based on the EFI one.
(grub_linux32_boot): Attempt to configure video settings with
grub_linux_setup_video().
(grub_rescue_cmd_linux): Set noreturn=0 in grub_loader_set, in order
to avoid grub_console_fini() which would step out of graphical mode
unconditionally.
* loader/i386/multiboot.c (code_size): New variable.
(grub_multiboot): Define offsets by adding to `code_size' rather
than substracting from `grub_multiboot_payload_size'. Provide
4-byte alignment to MBI and others by increasing
`boot_loader_name_length' appropiately.
* loader/i386/multiboot_elfxx.c
(CONCAT(grub_multiboot_load_elf, XX)): Initialize `code_size'.
Move more components to the relocation area, and fix mbi pointer
handling to use the destination rather than the origin (thanks to
Vladimir Serbinenko for spotting).
* loader/i386/multiboot.c (mbi_dest): New variable.
(grub_multiboot_boot): Use `mbi_dest' instead of `mbi'.
(grub_multiboot): Put cmdline, boot_loader_name and mbi in the
relocation area.
Factorize elf32 / elf64 code in Multiboot loader. This will
prevent it from getting out of sync again.
* loader/i386/multiboot.c (grub_multiboot_is_elf32,
grub_multiboot_load_elf32, grub_multiboot_is_elf64,
grub_multiboot_load_elf64): Move from here ...
* loader/i386/multiboot_elfxx.c (grub_multiboot_is_elf,
grub_multiboot_load_elf): ... to here (new file).
* include/multiboot.h (MULTIBOOT_INFO_ALIGN): New macro.
* loader/i386/pc/multiboot.c (grub_multiboot): Include the MBI
in our relocation, instead of using it directly from heap. Also
use `MULTIBOOT_INFO_ALIGN' to ensure it is aligned.
* include/grub/i386/coreboot/memory.h (GRUB_MEMORY_MACHINE_LOWER_SIZE):
Redefine to match with GRUB_MEMORY_MACHINE_UPPER_START (0x100000). We
don't want to mess with lower memory, because it is used in the Linux
loader.
* loader/i386/linux.c (allocate_pages): Allocate `real_mode_mem' in
an appropiate place in lower memory, between 0x10000 and 0x90000,
like loader/i386/efi/linux.c does. Linux often panics if real_mode_mem
is in our heap (probably as a result of it being corrupted during
decompression).
* include/multiboot2.h (struct multiboot_header): Add `flags' member as
per specification.
* loader/multiboot2.c (grub_multiboot2): Fix Multiboot2 header check.
* loader/multiboot_loader.c (find_multi_boot2_header): New function
(based on find_multi_boot1_header).
(grub_rescue_cmd_multiboot_loader): Check for Multiboot2 header,
using find_multi_boot2_header(), and abort if neither Multiboot or
Multiboot headers were found.
* loader/i386/pc/multiboot.c (grub_multiboot_load_elf32): Skip
segments when their filesz is zero (grub_file_read() interprets
zero-size as "read untill EOF", which results in memory corruption).
Use `lowest_segment' rather than 0 for calculating the current
segment load address.
* loader/i386/pc/multiboot.c (mmap_addr, mmap_length): Remove
variables.
(grub_multiboot): Move `mbi' allocation upwards, so that mmap address
and length can be stored directly in the `mbi->mmap_addr' and
`mbi->mmap_length' struct fields.
