* disk/ata.c (grub_ata_pio_write): Check status before writing,
like we do in grub_ata_pio_read().
(grub_ata_readwrite): Always write individual sectors. Fix the
sector count for the remainder.
(grub_ata_write): Enable writing to ATA devices. Correctly
report error for ATAPI devices.
* disk/ata.c (grub_ata_readwrite): Don't increment sector number
for every read sector, we already increment it for the whole
batch. This fixes reading more than 256 sectors at once.
* disk/ata.c (grub_ata_open): Don't lose precision in disk->id.
* disk/host.c (grub_host_open): Likewise.
* disk/loopback.c (grub_loopback_open): Likewise.
* disk/memdisk.c (grub_memdisk_open): Use a string pointer for
disk->id as in disk/host.c, not a multi-character constant.
Remove 2 TiB limit in ata.mod.
* disk/ata.c (grub_ata_device): Promote `size' to grub_uint64_t.
(grub_ata_dumpinfo): Print sector count with 0x%llx.
(grub_ata_identify): Interpret `&info16[100]' as a pointer to
grub_uint64_t instead of grub_uint32_t.
* kern/disk.c (grub_disk_firmware_fini)
(grub_disk_firmware_is_tainted): New variables.
* include/grub/disk.h (grub_disk_firmware_fini)
(grub_disk_firmware_is_tainted): Likewise.
* disk/i386/pc/biosdisk.c (GRUB_MOD_FINI(biosdisk)): Moved from here ...
(grub_disk_biosdisk_fini): ... to here.
(GRUB_MOD_FINI(biosdisk)): Implement using grub_disk_biosdisk_fini().
(GRUB_MOD_INIT(biosdisk)): Abort when `grub_disk_firmware_is_tainted'
is set. Register grub_disk_biosdisk_fini() in
`grub_disk_firmware_fini'.
* disk/ata.c: Remove `<grub/machine/biosdisk.h>'.
(GRUB_MOD_INIT(ata)): Remove grub_biosdisk_fini() call.
Use `grub_disk_firmware_is_tainted' and `grub_disk_firmware_fini'
to finish existing firmware disk interface.
* conf/i386-linuxbios.rmk (pkgdata_MODULES): Add `ata.mod'.
(ata_mod_SOURCES): New variable.
(ata_mod_CFLAGS): Likewise.
(ata_mod_LDFLAGS): Likewise.
* disk/ata.c (grub_ata_pio_read): Don't wait for the command to
become activate.
(grub_ata_pio_write): Likewise.
(grub_atapi_identify): Wait after issuing an ATA command.
(grub_atapi_packet): Likewise.
(grub_ata_identify): Likewise.
(grub_ata_readwrite): Likewise.
* disk/ata.c (grub_ata_pio_read): Detect and return the error code.
(grub_ata_pio_write): Likewise.
(grub_ata_readwrite): Use `grub_error', instead of
returning `grub_errno'.
