High resolution timer support. Implemented for x86 CPUs using TSC.
Extracted generic grub_millisleep() so it's linked in only as needed.
This requires a Pentium compatible CPU; if the RDTSC instruction is
not supported, then it falls back on the generic grub_get_time_ms()
implementation that uses the machine's RTC.
* conf/i386-pc.rmk (kernel_img_SOURCES): Add `kern/time.c',
`kern/i386/tsc.c', `kern/generic/rtc_get_time_ms.c' and
`kern/generic/millisleep.c'.
* conf/i386-efi.rmk (kernel_mod_SOURCES): Add `kern/i386/tsc.c',
`kern/generic/rtc_get_time_ms.c' and `kern/generic/millisleep.c'.
* conf/x86_64-efi.rml (kernel_mod_SOURCES): Add
`kern/generic/millisleep.c' and `kern/generic/rtc_get_time_ms.c'.
* conf/sparc64-ieee1275.rmk (kernel_elf_SOURCES): Likewise.
* conf/powerpc-ieee1275.rmk (kernel_elf_SOURCES): Add
`kern/generic/millisleep.c'.
* conf/i386-ieee1275.rmk (kernel_elf_SOURCES): Likewise.
* conf/i386-coreboot.rmk (kernel_elf_SOURCES): Add `kern/time.c'.
* kern/generic/rtc_get_time_ms.c: New file.
* kern/generic/millisleep.c: New file.
* kern/misc.c: Don't include
<kern/time.h> anymore.
(grub_millisleep_generic): Removed.
* commands/sleep.c (grub_interruptible_millisleep): Uses
grub_get_time_ms() instead of grub_get_rtc().
* include/grub/i386/tsc.h (grub_get_tsc): New file. New inline
function.
(grub_cpu_is_cpuid_supported): New inline function.
(grub_cpu_is_tsc_supported): New inline function.
(grub_tsc_init): New function prototype.
(grub_tsc_get_time_ms): New function prototype.
* kern/i386/tsc.c (grub_get_time_ms): New file.
* include/grub/time.h: Include <grub/types.h.
(grub_millisleep_generic): Removed.
(grub_get_time_ms): New prototype.
(grub_install_get_time_ms): New prototype.
(grub_rtc_get_time_ms): New prototype.
* kern/time.c (grub_get_time_ms): New function.
(grub_install_get_time_ms): New function.
* kern/i386/efi/init.c: Include <grub/cpu/tsc.h>. Don't include
<grub/time.h> anymore.
(grub_millisleep): Removed.
(grub_machine_init): Call grub_tsc_init.
* kern/i386/linuxbios/init.c (grub_machine_init): Install the RTC
get_time_ms() implementation.
* kern/sparc64/ieee1275/init.c (grub_millisleep): Removed.
(ieee1275_get_time_ms): New function.
(grub_machine_init): Install get_time_ms() implementation.
* kern/i386/pc/init.c: Include <grub/cpu/tsc.h>.
(grub_machine_init): Call grub_tsc_init().
(grub_millisleep): Removed.
* kern/ieee1275/init.c (grub_millisleep): Removed.
(grub_machine_init): Install ieee1275_get_time_ms()
implementation.
(ieee1275_get_time_ms): New function.
(grub_get_rtc): Now calls ieee1275_get_time_ms(), which does the
real work.
* kern/i386/pc/init.c (make_install_device): Check for `grub_prefix'
instead of `grub_install_dos_part' to determine whether a drive needs
to be prepended to prefix (`grub_install_dos_part' is not reliable,
because it can be overriden when loading GRUB via Multiboot).
* disk/memdisk.c (memdisk_size): Don't initialize.
(GRUB_MOD_INIT(memdisk)): Find memdisk using grub_module_iterate().
* include/grub/i386/pc/kernel.h
(GRUB_KERNEL_MACHINE_MEMDISK_IMAGE_SIZE): Remove macro.
(GRUB_KERNEL_MACHINE_PREFIX, GRUB_KERNEL_MACHINE_DATA_END): Shift.
(grub_memdisk_image_size, grub_arch_memdisk_addr)
(grub_arch_memdisk_size): Remove.
* include/grub/kernel.h (struct grub_module_header): Remove `offset'
field (was only used to transfer a constant). Add `type' field to
support multiple module types.
(grub_module_iterate): New function.
* kern/device.c (grub_device_open): Do not hide error messages
when grub_disk_open() fails. Use grub_print_error() instead.
* kern/i386/pc/init.c (grub_arch_modules_addr)
(grub_arch_memdisk_size): Remove functions.
(grub_arch_modules_addr): Return the module address in high memory
(now that it isn't copied anymore).
* kern/i386/pc/startup.S (grub_memdisk_image_size): Remove variable.
(codestart): Don't add grub_memdisk_image_size to %ecx in LZMA
decompression routine (grub_total_module_size already includes that
now). Don't copy modules back to low memory.
* kern/main.c: Include `<grub/mm.h>'.
(grub_load_modules): Split out (and use) ...
(grub_module_iterate): ... this function, which iterates through
module objects and runs a hook.
Comment out grub_mm_init_region() call, as it would cause non-ELF
modules to be overwritten.
* util/i386/pc/grub-mkimage.c (generate_image): Instead of appending
the memdisk image in its own region, make it part of the module list.
* util/elf/grub-mkimage.c (options): Add "memdisk"|'m' option.
(main): Parse --memdisk|-m option, and pass user-provided path as
parameter to generate_image().
(add_segments): Pass `memdisk_path' down to load_modules().
(load_modules): Embed memdisk image in module section when requested.
* util/i386/efi/grub-mkimage.c (make_mods_section): Initialize
`header.type' instead of `header.offset'.
* conf/powerpc-ieee1275.rmk (pkglib_MODULES): Add `memdisk.mod'.
(memdisk_mod_SOURCES, memdisk_mod_CFLAGS)
(memdisk_mod_LDFLAGS): New variables.
* conf/i386-coreboot.rmk: Likewise.
* conf/i386-ieee1275.rmk: Likewise.
* loader/i386/pc/multiboot.c (playground, forward_relocator)
(backward_relocator): New variables. Used to allocate and relocate
the payload, respectively.
(grub_multiboot_load_elf32): Load into heap instead of requested
address, install the appropiate relocator code in each bound of
the payload, and set the entry point such that
grub_multiboot_real_boot() will jump to one of them.
* kern/i386/loader.S (grub_multiboot_payload_size)
(grub_multiboot_payload_orig, grub_multiboot_payload_dest)
(grub_multiboot_payload_entry_offset): New variables.
(grub_multiboot_real_boot): Set cpu context to what the relocator
expects, and jump to the relocator instead of the payload.
* include/grub/i386/loader.h (grub_multiboot_payload_size)
(grub_multiboot_payload_orig, grub_multiboot_payload_dest)
(grub_multiboot_payload_entry_offset): Export.
* kern/ieee1275/init.c (grub_machine_set_prefix): If `grub_prefix'
is non-empty, use it to set the `prefix' environment variable instead
of the usual approach.
* kern/i386/linuxbios/init.c (make_install_device): Remove function.
(grub_machine_set_prefix): Use `grub_prefix' to set the `prefix'
environment variable instead of dummy make_install_device().
* kern/i386/ieee1275/startup.S: Include `<grub/machine/kernel.h>'.
(start): Insert a data section, with `grub_prefix' variable.
* kern/i386/linuxbios/startup.S: Likewise.
* include/grub/powerpc/ieee1275/kernel.h [!ASM_FILE] (grub_prefix):
New variable reference.
* include/grub/i386/ieee1275/kernel.h (GRUB_KERNEL_MACHINE_PREFIX):
New macro. Defines offset of `grub_prefix' within startup.S (relative
to `start').
(GRUB_KERNEL_MACHINE_DATA_END): New macro. Defines the end of data
section within startup.S (relative to `start').
* include/grub/i386/coreboot/kernel.h: Likewise.
* util/elf/grub-mkimage.c (add_segments): Receive `prefix' parameter.
Overwrite grub_prefix with its contents, at the beginning of the
first segment.
(main): Understand -p|--prefix.
* common.rmk (bin_UTILITIES): Add grub-pe2elf.
(grub_pe2elf_SOURCES): New macro.
(CLEANFILES): Add grub-pe2elf.
* include/grub/efi/pe32.h (GRUB_PE32_SCN_ALIGN_1BYTES): New constant.
(GRUB_PE32_SCN_ALIGN_2BYTES): Likewise.
(GRUB_PE32_SCN_ALIGN_4BYTES): Likewise.
(GRUB_PE32_SCN_ALIGN_8BYTES): Likewise.
(GRUB_PE32_SCN_ALIGN_16BYTES): Likewise.
(GRUB_PE32_SCN_ALIGN_32BYTES): Likewise.
(GRUB_PE32_SCN_ALIGN_64BYTES): Likewise.
(GRUB_PE32_SCN_ALIGN_SHIFT): Likewise.
(GRUB_PE32_SCN_ALIGN_MASK): Likewise.
(GRUB_PE32_SYM_CLASS_EXTERNAL): Likewise.
(GRUB_PE32_SYM_CLASS_STATIC): Likewise.
(GRUB_PE32_SYM_CLASS_FILE): Likewise.
(GRUB_PE32_DT_FUNCTION): Likewise.
(GRUB_PE32_REL_I386_DIR32): Likewise.
(GRUB_PE32_REL_I386_REL32): Likewise.
(grub_pe32_symbol): New structure.
(grub_pe32_reloc): Likewise.
* util/grub-pe2elf.c: New file.
* configure.ac: Set TARGET_OBJ2ELF if host os is cygwin. Don't test for
start symbol in non pc platform.
* genmk.rb: Use TARGET_OBJ2ELF to convert native object format to elf.
The following patches are from Christian Franke.
* include/grub/dl.h: Remove .previous, gas supports this only
for ELF format.
* include/grub/symbol.h [__CYGWIN__] (#define FUNCTION/VARIABLE):
Remove .type, gas supports this only for ELF format.
* kern/dl.c (grub_dl_resolve_dependencies): Add check for trailing
nullbytes in symbol table. This fixes an infinite loop if table is
zero filled.
* Makefile.in: Add autoconf replacements TARGET_IMG_LDSCRIPT,
TARGET_IMG_LDFLAGS and EXEEXT.
* aclocal.m4 (grub_PROG_OBJCOPY_ABSOLUTE): Replace -Wl,-N by
TARGET_IMG_LDFLAGS_AC.
(grub_CHECK_STACK_ARG_PROBE): New function.
* conf/i386-pc.rmk: Replace -Wl,-N by TARGET_IMG_LDFLAGS.
* conf/i386-pc-cygwin-ld-img.sc: New linker script.
* configure.ac: Add check for linker script "conf/${target}-img-ld.c"
to set TARGET_IMG_LD* accordingly.
Add check for Cygwin to set TARGET_MOD_OBJCOPY accordingly.
Add call to grub_CHECK_STACK_ARG_PROBE.
Use TARGET_IMG_LDFLAGS to check start, bss_start, end symbols.
* genkernsyms.sh.in: Handle HAVE_ASM_USCORE case.
* genmk.rb: Add EXEEXT to CLEANFILES.
* kern/dl.c: Go back to using GRUB_CPU_SIZEOF_VOID_P. We cannot
load foreign architecture modules correctly anyway. Keep
support for loading host architecture modules, whether we
compile them or not.
* kern/i386/linuxbios/init.c (grub_machine_init): Cast addr to
grub_addr_t before casting it to the void pointer to fix a
warning. Non-addressable regions are discarded earlier.
(grub_arch_modules_addr): Cast _end to grub_addr_t.
* kern/i386/linuxbios/table.c: Include grub/misc.h.
(check_signature): Don't shadow table_header.
(grub_linuxbios_table_iterate): Cast numeric constants to
grub_linuxbios_table_header_t.
* include/grub/i386/linuxbios/init.h: Add noreturn attribute to
grub_stop().
This fixes a performance issue when pc & gpt partmap iterators
didn't abort iteration even after our hook found what it was
looking for (often causing expensive probes of non-existant drives).
Some callers relied on previous buggy behaviour, since they would
rise an error when their own hooks caused early abortion of its
iteration.
* kern/device.c (grub_device_open): Improve error message.
* disk/lvm.c (grub_lvm_open): Likewise.
* disk/raid.c (grub_raid_open): Likewise.
* partmap/pc.c (pc_partition_map_iterate): Abort parent iteration
when hook requests it, independently of grub_errno.
(pc_partition_map_probe): Do not fail when find_func() caused
early abortion of pc_partition_map_iterate().
* partmap/gpt.c (gpt_partition_map_iterate): Abort parent iteration
when hook requests it, independently of grub_errno.
(gpt_partition_map_probe): Do not fail when find_func() caused
early abortion of gpt_partition_map_iterate().
* kern/partition.c (grub_partition_iterate): Abort parent iteration
when hook requests it, independently of grub_errno. Do not fail when
part_map_iterate_hook() caused early abortion of p->iterate().
* util/biosdisk.c (grub_util_biosdisk_get_grub_dev): Do not fail
when grub_partition_iterate() returned with non-zero.
* include/grub/ieee1275.h (grub_ieee1275_flag): New constant
GRUB_IEEE1275_FLAG_CANNOT_INTERPRET, GRUB_IEEE1275_FLAG_FORCE_CLAIM
and GRUB_IEEE1275_FLAG_NO_ANSI.
* kern/ieee1275/cmain.c (grub_ieee1275_find_options): Set flag
GRUB_IEEE1275_FLAG_CANNOT_INTERPRET, GRUB_IEEE1275_FLAG_FORCE_CLAIM
and GRUB_IEEE1275_FLAG_NO_ANSI for Open Hackware.
* kern/ieee1275/ieee1275.c (grub_ieee1275_interpret): Return
immediately if GRUB_IEEE1275_FLAG_CANNOT_INTERPRET is set.
* kern/ieee1275/init.c (grub_claim_heap): Claim memory directly if
GRUB_IEEE1275_FLAG_FORCE_CLAIM is set.
* term/ieee1275/ofconsole.c (grub_ofconsole_writeesc): Don't output
esc sequence on non ANSI terminal.
(grub_ofconsole_gotoxy): Emulate backspace key on non ANSI terminal.
* util/elf/grub-mkimage.c (add_segments): Move ELF header to the
beginning of file.
* commands/ls.c (grub_ls_list_files): Use integer calculations
for human readable format, avoid floating point use.
* kern/misc.c (grub_ftoa): Remove.
(grub_vsprintf): Remove floating point support.
* util/i386/pc/grub-mkimage.c (generate_image): If we included a drive
in our prefix, set install_{dos,bsd}_part = -2 to indicate this can be
skipped later.
(main): If a memdisk was requested, add "(memdisk)" drive explicitly to
the beginning of the prefix.
* kern/i386/pc/init.c (make_install_device): Remove memdisk check.
It is assumed that if we have a memdisk, grub-mkimage has set
grub_prefix to include the "(memdisk)" drive in it.
Based on description from Pavel:
* kern/disk.c (grub_disk_check_range): Rename to ...
(grub_disk_adjust_range): ... this. Add a comment explaining the
tasks performed by this function.
Ensure GRUB_KERNEL_MACHINE_DATA_END is always consistent with the
rest of GRUB, and breakage doesn't happen if its value were modified.
* include/grub/i386/pc/kernel.h (GRUB_KERNEL_MACHINE_RAW_SIZE):
Redefine as an offset from `GRUB_KERNEL_MACHINE_DATA_END' instead of
a constant (same value).
* kern/i386/pc/startup.S: Replace hardcoded `0x50' with
`GRUB_KERNEL_MACHINE_DATA_END' (same value).
* Makefile.in (RMKFILES): Add missing arch i386-ieee1275 and
i386-linuxbios.
* commands/hexdump.c (grub_cmd_hexdump): Support dumping of device,
change the buffer size to 4096 for cdrom device.
* conf/i386-ieee1275.rmk (pkglib_MODULES): Add _linux.mod, linux.mod
and nand.mod.
(_linux_mod_SOURCES): New variable.
(_linux_mod_CFLAGS): Likewise.
(_linux_mod_LDFLAGS): Likewise.
(linux_mod_SOURCES): Likewise.
(linux_mod_CFLAGS): Likewise.
(linux_mod_LDFLAGS): Likewise.
(nand_mod_SOURCES): Likewise.
(nand_mod_CFLAGS): Likewise.
(nand_mod_LDFLAGS): Likewise.
* disk/ieee1275/ofdisk.c (grub_ofdisk_open): Return
GRUB_ERR_UNKNOWN_DEVICE instead of GRUB_ERR_BAD_DEVICE if no device
type property. (nand device in olpc don't have this property)
* include/grub/disk.h (grub_disk_dev_id): New macro
GRUB_DISK_DEVICE_NAND_ID.
* include/grub/i386/ieee1275/loader.h (grub_rescue_cmd_linux): New
function prototype.
(grub_rescue_cmd_initrd): Likewise.
* include/grub/i386/linux.h (GRUB_LINUX_OFW_SIGNATURE): New macro.
(linux_kernel_params): Add new member ofw_signature, ofw_num_items,
ofw_cif_handler and ofw_idt, adjust padding number.
* include/grub/i386/pc/memory.h (grub_upper_mem): Export it if
GRUB_MACHINE_IEEE1275 is defined.
* include/grub/ieee1275/ieee1275.h (grub_available_iterate):
Use NESTED_FUNC_ATTR attribute on the hook parameter.
* kern/powerpc/ieee1275/init.c (grub_claim_heap): Use NESTED_FUNC_ATTR
on nested function heap_init.
(grub_upper_mem): New variable for i386-ieee1275.
(grub_get_extended_memory): New function for i386-ieee1275.
(grub_machine_init): Call grub_get_extended_memory for i386-ieee1275.
* kern/powerpc/ieee1275/openfw.c (grub_available_iterate): Use
NESTED_FUNC_ATTR on the hook parameter. Don't quit if no device type
property.
* loader/i386/ieee1275/linux.c: New file.
* loader/i386/ieee1275/linux_normal.c: New file.
* disk/ieee1275/nand.c: New file.
Restructures early code path on ieee1275 to unify grub_main() as
the first C function that is executed in every platform.
* include/grub/ieee1275/ieee1275.h (grub_ieee1275_init): New prototype.
* kern/i386/ieee1275/startup.S (_start): Jump to grub_main() instead of
cmain().
* kern/powerpc/ieee1275/crt0.S (_start): Likewise.
* kern/ieee1275/cmain.c (cmain): Rename to ...
* kern/ieee1275/cmain.c (grub_ieee1275_init): ... this.
* kern/ieee1275/init.c (grub_machine_init): Call grub_ieee1275_init()
at the beginning.
* kern/powerpc/ieee1275/init.c: Move from here ...
* kern/ieee1275/init.c: ... to here. Update all users.
* kern/powerpc/ieee1275/cmain.c: Move from here ...
* kern/ieee1275/cmain.c: ... to here. Update all users.
* kern/powerpc/ieee1275/openfw.c: Move from here ...
* kern/ieee1275/openfw.c: ... to here. Update all users.
* loader/powerpc/ieee1275/multiboot2.c: Move from here ...
* loader/ieee1275/multiboot2.c: ... to here. Update all users.
* kern/powerpc/ieee1275/cmain.c (grub_ieee1275_find_options):
Fix signedness warnings.
* kern/powerpc/ieee1275/openfw.c (grub_available_iterate):
Likewise.
* util/ieee1275/get_disk_name.c: Include config.h so that
_GNU_SOURCE is defined and getline() is declared. Mark an
unused argument as such. Fix a signedness warning.
* kern/i386/pc/startup.S (real_to_prot): Use %cs prefix to load
GDT. This is more robust, as %ds can change.
(grub_biosdisk_rw_int13_extensions): Don't clear %ds before
calling real_to_prot().
(grub_biosdisk_get_diskinfo_int13_extensions): Likewise.
* kern/i386/pc/startup.S: Assert that uncompressed functions
don't spill beyond GRUB_KERNEL_MACHINE_RAW_SIZE.
* kern/i386/pc/lzo1x.S: Remove all .align directives in the
code, as they push parts of the code (error handlers) beyond
GRUB_KERNEL_MACHINE_RAW_SIZE. Speed is not as important in this
code as correctness and size.
* kern/i386/pc/startup.S
(grub_biosdisk_get_diskinfo_int13_extensions): When converting
data block address to the real mode, keep offset minimal. This
works around a bug in AWARD BIOS on old Athlon systems, which
makes CD detection hang.
* conf/i386-pc.rmk (pkglib_MODULES): Add aout.mod _bsd.mod and bsd.mod.
(aout_mod_SOURCES): New variable.
(aout_mod_CFLAGS): Likewise.
(aout_mod_LDFLAGS): Likewise.
(_bsd_mod_SOURCES): New variable.
(_bsd_mod_CFLAGS): Likewise.
(_bsd_mod_LDFLAGS): Likewise.
(bsd_mod_SOURCES): New variable.
(bsd_mod_CFLAGS): Likewise.
(bsd_mod_LDFLAGS): Likewise.
* include/grub/aout.h: New file.
* include/grub/i386/loader.h (grub_unix_real_boot): New function.
* include/grub/i386/bsd.h: New file.
* include/grub/i386/pc/init.h (grub_get_mmap_entry): Use EXPORT_FUNC
to make it public.
* kern/elf.c (grub_elf32_load): Get the physical address after the hook
function is called, so that it's possible to change it inside the hook.
(grub_elf64_load): Likewise.
(grub_elf_file): Don't close the file if elf header is not found.
(grub_elf_close): Close the file if grub_elf_file fails (The new
grub_elf_file won't close it).
(grub_elf32_size): Use NESTED_FUNC_ATTR for nested function calcsize.
(grub_elf64_size): Likewise.
* kern/i386/loader.S (grub_unix_real_boot): New function.
* loader/aout.c: New file.
* loader/i386/bsd.c: New file.
* loader/i386/bsd_normal.c: New file.
* loader/i386/pc/multiboot.c (grub_multiboot): Handle a.out format.
* loader/multiboot2.c (grub_multiboot2): Reset grub_errno so that it
can test othe formats.
* conf/i386-efi.rmk (grub_emu_SOURCES): Replace commands/i386/pc/halt.c and
reboot.c by commands/halt.c and reboot.c.
(grub_install_SOURCES): Add halt.mod and reboot.mod.
(halt_mod_SOURCES): New variable.
(halt_mod_CFLAGS): Likewise.
(halt_mod_LDFLAGS): Likewise.
(reboot_mod_SOURCES): Likewise.
(reboot_mod_CFLAGS): Likewise.
(reboot_mod_LDFLAGS): Likewise.
* conf/i386-ieee1275.rmk (grub_emu_SOURCES): Replace commands/ieee1275/halt.c
and reboot.c by commands/halt.c and reboot.c.
(halt_mod_SOURCES): Likewise.
(reboot_mod_SOURCES): Likewise.
* conf/i386-pc.rmk (grub_emu_SOURCES): Replace commands/i386/pc/reboot.c by
commands/reboot.c.
(reboot_mod_SOURCES): Likewise.
* commands/i386/pc/reboot.c: merge this file ...
* commands/ieee1275/reboot.c: ... and this file ...
* commands/reboot.c: ... to this file.
Add some precompiler directive to include the correct header for each
machine.
* commands/ieee1275/halt.c: move this file ...
* commands/halt.c: ... to here.
Add some precompiler directive to include the correct header for each
machine.
* include/grub/efi/efi.h (grub_reboot): New function declaration.
(grub_halt): Likewise.
* kern/efi/efi.c (grub_reboot): New function.
(grub_halt): Likewise.
* kern/main.c (grub_load_normal_mode): Do not reset `grub_errno'. Call
grub_print_error() instead. This will let user know why we're entering
rescue mode.
Based on suggestions from Sam Morris.
* disk/raid.c (grub_raid_open, grub_raid_scan_device): Add a few
grub_dprintf() calls.
* kern/disk.c (grub_disk_read): Include grub_errmsg in out of range
error message.
* include/grub/term.h (GRUB_TERM_LEFT, GRUB_TERM_RIGHT)
(GRUB_TERM_UP, GRUB_TERM_DOWN, GRUB_TERM_HOME, GRUB_TERM_END)
(GRUB_TERM_DC, GRUB_TERM_PPAGE, GRUB_TERM_NPAGE, GRUB_TERM_ESC)
(GRUB_TERM_TAB, GRUB_TERM_BACKSPACE): New macros.
* kern/i386/pc/startup.S: Include `<grub/term.h>'.
(translation_table): Replace hardcoded values with macros
provided by `<grub/term.h>'.
* term/i386/pc/at_keyboard.c: Include `<grub/term.h>'.
(keyboard_map): Correct/add a few values, with macros provided
by `<grub/term.h>'.
(keyboard_map_shift): Zero values that don't differ from their
`keyboard_map' equivalents.
(grub_console_checkkey): Optimize KEYBOARD_STATUS_CAPS_LOCK toggling.
Discard the second scan code that is always sent by Caps lock.
Only use `keyboard_map_shift' when it provides a non-zero value,
otherwise fallback to `keyboard_map'.
Add support for having a grub directory in a different drive. This
is still only the data handling part.
* kern/i386/pc/startup.S (multiboot_trampoline): Set %dh to 0xFF.
(codestart): Save %dh in GRUB_ROOT_DRIVE.
(grub_root_drive): New variable.
* kern/i386/pc/init.c (make_install_device): Use GRUB_ROOT_DRIVE
instead of GRUB_BOOT_DRIVE to construct a device name. Set
GRUB_ROOT_DRIVE to GRUB_BOOT_DRIVE if it is 0xFF, otherwise use it
as it was.
* include/grub/i386/pc/kernel.h (grub_root_drive): New prototype.
* include/grub/i386/pc/boot.h (GRUB_BOOT_MACHINE_ROOT_DRIVE): New
macro.
(GRUB_BOOT_MACHINE_DRIVE_CHECK): Set to 0x4f.
* boot/i386/pc/pxeboot.S (_start): Set %dh to 0xFF. For now, this
is bogus, because PXE booting does not specify any drive
correctly.
* boot/i386/pc/lnxboot.S (reg_edx): Set the second byte to 0xFF. I
am not sure if this is really correct.
* boot/i386/pc/cdboot.S: Set %dh to 0xFF, because the root drive
is always identical to the boot drive when booting from a CD.
* boot/i386/pc/boot.S (MOV_MEM_TO_AL): Removed. Not needed any
longer.
(root_drive): New variable.
(real_start): Unconditionally set %dh to ROOT_DRIVE.
(setup_sectors): Push %dx right after popping it, because %dh will
be modified later.
(copy_buffer): Restore %dx.
* a/kern/i386/pc/startup.S (grub_chainloader_real_boot): Pop
%edx and %esi from stack only after grub_gate_a20() is called.
grub_gate_a20() clobbers %edx.
