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freebsd-nq/sys/dev/ata/ata-raid.h
Søren Schmidt eed08844c9 Add support for writing Intel MatrixRAID arrays. 
Do a little better on handling volumes as well, however we cant create
multiple volumes from FreeBSD yet.

HW sponsored by:        Mullet Scandinavia AB
2005-12-05 17:33:57 +00:00

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/*-
* Copyright (c) 2000 - 2005 Søren Schmidt <sos@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer,
* without modification, immediately at the beginning of the file.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
/* misc defines */
#define MAX_ARRAYS 16
#define MAX_VOLUMES 4
#define MAX_DISKS 16
#define AR_PROXIMITY 2048 /* how many sectors is "close" */
#define ATA_MAGIC "FreeBSD ATA driver RAID "
struct ata_raid_subdisk {
struct ar_softc *raid[MAX_VOLUMES];
int disk_number[MAX_VOLUMES];
};
/* ATA PseudoRAID Metadata */
struct ar_softc {
int lun;
u_int8_t name[32];
int volume;
u_int64_t magic_0;
u_int64_t magic_1;
int type;
#define AR_T_JBOD 0x0001
#define AR_T_SPAN 0x0002
#define AR_T_RAID0 0x0004
#define AR_T_RAID1 0x0008
#define AR_T_RAID01 0x0010
#define AR_T_RAID3 0x0020
#define AR_T_RAID4 0x0040
#define AR_T_RAID5 0x0080
int status;
#define AR_S_READY 0x0001
#define AR_S_DEGRADED 0x0002
#define AR_S_REBUILDING 0x0004
int format;
#define AR_F_FREEBSD_RAID 0x0001
#define AR_F_ADAPTEC_RAID 0x0002
#define AR_F_HPTV2_RAID 0x0004
#define AR_F_HPTV3_RAID 0x0008
#define AR_F_INTEL_RAID 0x0010
#define AR_F_ITE_RAID 0x0020
#define AR_F_LSIV2_RAID 0x0040
#define AR_F_LSIV3_RAID 0x0080
#define AR_F_NVIDIA_RAID 0x0100
#define AR_F_PROMISE_RAID 0x0200
#define AR_F_SII_RAID 0x0400
#define AR_F_SIS_RAID 0x0800
#define AR_F_VIA_RAID 0x1000
#define AR_F_FORMAT_MASK 0x1fff
u_int generation;
u_int64_t total_sectors;
u_int64_t offset_sectors; /* offset from start of disk */
u_int16_t heads;
u_int16_t sectors;
u_int32_t cylinders;
u_int width; /* array width in disks */
u_int interleave; /* interleave in sectors */
u_int total_disks; /* number of disks in this array */
struct ar_disk {
device_t dev;
u_int8_t serial[16]; /* serial # of physical disk */
u_int64_t sectors; /* useable sectors on this disk */
off_t last_lba; /* last lba used (for performance) */
u_int flags;
#define AR_DF_PRESENT 0x0001 /* this HW pos has a disk present */
#define AR_DF_ASSIGNED 0x0002 /* this HW pos assigned to an array */
#define AR_DF_SPARE 0x0004 /* this HW pos is a spare */
#define AR_DF_ONLINE 0x0008 /* this HW pos is online and in use */
} disks[MAX_DISKS];
int toggle; /* performance hack for RAID1's */
u_int64_t rebuild_lba; /* rebuild progress indicator */
struct mtx lock; /* metadata lock */
struct disk *disk; /* disklabel/slice stuff */
struct proc *pid; /* rebuilder process id */
};
/* Adaptec HostRAID Metadata */
#define ADP_LBA(dev) \
(((struct ad_softc *)device_get_ivars(dev))->total_secs - 17)
/* note all entries are big endian */
struct adaptec_raid_conf {
u_int32_t magic_0;
#define ADP_MAGIC_0 0xc4650790
u_int32_t generation;
u_int16_t dummy_0;
u_int16_t total_configs;
u_int16_t dummy_1;
u_int16_t checksum;
u_int32_t dummy_2;
u_int32_t dummy_3;
u_int32_t flags;
u_int32_t timestamp;
u_int32_t dummy_4[4];
u_int32_t dummy_5[4];
struct {
u_int16_t total_disks;
u_int16_t generation;
u_int32_t magic_0;
u_int8_t dummy_0;
u_int8_t type;
#define ADP_T_RAID0 0x00
#define ADP_T_RAID1 0x01
u_int8_t dummy_1;
u_int8_t flags;
u_int8_t dummy_2;
u_int8_t dummy_3;
u_int8_t dummy_4;
u_int8_t dummy_5;
u_int32_t disk_number;
u_int32_t dummy_6;
u_int32_t sectors;
u_int16_t stripe_shift;
u_int16_t dummy_7;
u_int32_t dummy_8[4];
u_int8_t name[16];
} configs[127];
u_int32_t dummy_6[13];
u_int32_t magic_1;
#define ADP_MAGIC_1 0x9ff85009
u_int32_t dummy_7[3];
u_int32_t magic_2;
u_int32_t dummy_8[46];
u_int32_t magic_3;
#define ADP_MAGIC_3 0x4d545044
u_int32_t magic_4;
#define ADP_MAGIC_4 0x9ff85009
u_int32_t dummy_9[62];
} __packed;
/* Highpoint V2 RocketRAID Metadata */
#define HPTV2_LBA(dev) 9
struct hptv2_raid_conf {
int8_t filler1[32];
u_int32_t magic;
#define HPTV2_MAGIC_OK 0x5a7816f0
#define HPTV2_MAGIC_BAD 0x5a7816fd
u_int32_t magic_0;
u_int32_t magic_1;
u_int32_t order;
#define HPTV2_O_RAID0 0x01
#define HPTV2_O_RAID1 0x02
#define HPTV2_O_OK 0x04
u_int8_t array_width;
u_int8_t stripe_shift;
u_int8_t type;
#define HPTV2_T_RAID0 0x00
#define HPTV2_T_RAID1 0x01
#define HPTV2_T_RAID01_RAID0 0x02
#define HPTV2_T_SPAN 0x03
#define HPTV2_T_RAID_3 0x04
#define HPTV2_T_RAID_5 0x05
#define HPTV2_T_JBOD 0x06
#define HPTV2_T_RAID01_RAID1 0x07
u_int8_t disk_number;
u_int32_t total_sectors;
u_int32_t disk_mode;
u_int32_t boot_mode;
u_int8_t boot_disk;
u_int8_t boot_protect;
u_int8_t error_log_entries;
u_int8_t error_log_index;
struct {
u_int32_t timestamp;
u_int8_t reason;
#define HPTV2_R_REMOVED 0xfe
#define HPTV2_R_BROKEN 0xff
u_int8_t disk;
u_int8_t status;
u_int8_t sectors;
u_int32_t lba;
} errorlog[32];
int8_t filler2[16];
u_int32_t rebuild_lba;
u_int8_t dummy_1;
u_int8_t name_1[15];
u_int8_t dummy_2;
u_int8_t name_2[15];
int8_t filler3[8];
} __packed;
/* Highpoint V3 RocketRAID Metadata */
#define HPTV3_LBA(dev) \
(((struct ad_softc *)device_get_ivars(dev))->total_secs - 11)
struct hptv3_raid_conf {
u_int32_t magic;
#define HPTV3_MAGIC 0x5a7816f3
u_int32_t magic_0;
u_int8_t checksum_0;
u_int8_t mode;
#define HPTV3_BOOT_MARK 0x01
#define HPTV3_USER_MODE 0x02
u_int8_t user_mode;
u_int8_t config_entries;
struct {
u_int32_t total_sectors;
u_int8_t type;
#define HPTV3_T_SPARE 0x00
#define HPTV3_T_JBOD 0x03
#define HPTV3_T_SPAN 0x04
#define HPTV3_T_RAID0 0x05
#define HPTV3_T_RAID1 0x06
#define HPTV3_T_RAID3 0x07
#define HPTV3_T_RAID5 0x08
u_int8_t total_disks;
u_int8_t disk_number;
u_int8_t stripe_shift;
u_int16_t status;
#define HPTV3_T_NEED_REBUILD 0x01
#define HPTV3_T_RAID5_FLAG 0x02
u_int16_t critical_disks;
u_int32_t rebuild_lba;
} __packed configs[2];
u_int8_t name[16];
u_int32_t timestamp;
u_int8_t description[64];
u_int8_t creator[16];
u_int8_t checksum_1;
u_int8_t dummy_0;
u_int8_t dummy_1;
u_int8_t flags;
#define HPTV3_T_ENABLE_TCQ 0x01
#define HPTV3_T_ENABLE_NCQ 0x02
#define HPTV3_T_ENABLE_WCACHE 0x04
#define HPTV3_T_ENABLE_RCACHE 0x08
struct {
u_int32_t total_sectors;
u_int32_t rebuild_lba;
} __packed configs_high[2];
u_int32_t filler[87];
} __packed;
/* Intel MatrixRAID Metadata */
#define INTEL_LBA(dev) \
(((struct ad_softc *)device_get_ivars(dev))->total_secs - 3)
struct intel_raid_conf {
u_int8_t intel_id[24];
#define INTEL_MAGIC "Intel Raid ISM Cfg Sig. "
u_int8_t version[6];
#define INTEL_VERSION_1100 "1.1.00"
#define INTEL_VERSION_1201 "1.2.01"
#define INTEL_VERSION_1202 "1.2.02"
u_int8_t dummy_0[2];
u_int32_t checksum;
u_int32_t config_size;
u_int32_t config_id;
u_int32_t generation;
u_int32_t dummy_1[2];
u_int8_t total_disks;
u_int8_t total_volumes;
u_int8_t dummy_2[2];
u_int32_t filler_0[39];
struct {
u_int8_t serial[16];
u_int32_t sectors;
u_int32_t id;
u_int32_t flags;
#define INTEL_F_SPARE 0x01
#define INTEL_F_ASSIGNED 0x02
#define INTEL_F_DOWN 0x04
#define INTEL_F_ONLINE 0x08
u_int32_t filler[5];
} __packed disk[1];
u_int32_t filler_1[62];
} __packed;
struct intel_raid_mapping {
u_int8_t name[16];
u_int64_t total_sectors __packed;
u_int32_t state;
u_int32_t reserved;
u_int32_t filler_0[20];
u_int32_t offset;
u_int32_t disk_sectors;
u_int32_t stripe_count;
u_int16_t stripe_sectors;
u_int8_t status;
#define INTEL_S_READY 0x00
#define INTEL_S_DISABLED 0x01
#define INTEL_S_DEGRADED 0x02
#define INTEL_S_FAILURE 0x03
u_int8_t type;
#define INTEL_T_RAID0 0x00
#define INTEL_T_RAID1 0x01
#define INTEL_T_RAID5 0x05
u_int8_t total_disks;
u_int8_t magic[3];
u_int32_t filler_1[7];
u_int32_t disk_idx[1];
} __packed;
/* Integrated Technology Express Metadata */
#define ITE_LBA(dev) \
(((struct ad_softc *)device_get_ivars(dev))->total_secs - 2)
struct ite_raid_conf {
u_int32_t filler_1[5];
u_int8_t timestamp_0[8];
u_int32_t dummy_1;
u_int32_t filler_2[5];
u_int16_t filler_3;
u_int8_t ite_id[40];
#define ITE_MAGIC "Integrated Technology Express Inc "
u_int16_t filler_4;
u_int32_t filler_5[6];
u_int32_t dummy_2;
u_int32_t dummy_3;
u_int32_t filler_6[12];
u_int32_t dummy_4;
u_int32_t filler_7[5];
u_int64_t total_sectors __packed;
u_int32_t filler_8[12];
u_int16_t filler_9;
u_int8_t type;
#define ITE_T_RAID0 0x00
#define ITE_T_RAID1 0x01
#define ITE_T_RAID01 0x02
#define ITE_T_SPAN 0x03
u_int8_t filler_10;
u_int32_t dummy_5[8];
u_int8_t stripe_1kblocks;
u_int8_t filler_11[3];
u_int32_t filler_12[54];
u_int32_t dummy_6[4];
u_int8_t timestamp_1[8];
u_int32_t filler_13[9];
u_int8_t stripe_sectors;
u_int8_t filler_14[3];
u_int8_t array_width;
u_int8_t filler_15[3];
u_int32_t filler_16;
u_int8_t filler_17;
u_int8_t disk_number;
u_int32_t disk_sectors;
u_int16_t filler_18;
u_int32_t dummy_7[4];
u_int32_t filler_20[104];
} __packed;
/* LSILogic V2 MegaRAID Metadata */
#define LSIV2_LBA(dev) \
(((struct ad_softc *)device_get_ivars(dev))->total_secs - 1)
struct lsiv2_raid_conf {
u_int8_t lsi_id[6];
#define LSIV2_MAGIC "$XIDE$"
u_int8_t dummy_0;
u_int8_t flags;
u_int16_t version;
u_int8_t config_entries;
u_int8_t raid_count;
u_int8_t total_disks;
u_int8_t dummy_1;
u_int16_t dummy_2;
union {
struct {
u_int8_t type;
#define LSIV2_T_RAID0 0x01
#define LSIV2_T_RAID1 0x02
#define LSIV2_T_SPARE 0x08
u_int8_t dummy_0;
u_int16_t stripe_sectors;
u_int8_t array_width;
u_int8_t disk_count;
u_int8_t config_offset;
u_int8_t dummy_1;
u_int8_t flags;
#define LSIV2_R_DEGRADED 0x02
u_int32_t total_sectors;
u_int8_t filler[3];
} __packed raid;
struct {
u_int8_t device;
#define LSIV2_D_MASTER 0x00
#define LSIV2_D_SLAVE 0x01
#define LSIV2_D_CHANNEL0 0x00
#define LSIV2_D_CHANNEL1 0x10
#define LSIV2_D_NONE 0xff
u_int8_t dummy_0;
u_int32_t disk_sectors;
u_int8_t disk_number;
u_int8_t raid_number;
u_int8_t flags;
#define LSIV2_D_GONE 0x02
u_int8_t filler[7];
} __packed disk;
} configs[30];
u_int8_t disk_number;
u_int8_t raid_number;
u_int32_t timestamp;
u_int8_t filler[10];
} __packed;
/* LSILogic V3 MegaRAID Metadata */
#define LSIV3_LBA(dev) \
(((struct ad_softc *)device_get_ivars(dev))->total_secs - 4)
struct lsiv3_raid_conf {
u_int32_t magic_0; /* 0xa0203200 */
u_int32_t filler_0[3];
u_int8_t magic_1[4]; /* "SATA" */
u_int32_t filler_1[40];
u_int32_t dummy_0; /* 0x0d000003 */
u_int32_t filler_2[7];
u_int32_t dummy_1; /* 0x0d000003 */
u_int32_t filler_3[70];
u_int8_t magic_2[8]; /* "$_ENQ$31" */
u_int8_t filler_4[7];
u_int8_t checksum_0;
u_int8_t filler_5[512*2];
u_int8_t lsi_id[6];
#define LSIV3_MAGIC "$_IDE$"
u_int16_t dummy_2; /* 0x33de for OK disk */
u_int16_t version; /* 0x0131 for this version */
u_int16_t dummy_3; /* 0x0440 always */
u_int32_t filler_6;
struct {
u_int16_t stripe_pages;
u_int8_t type;
#define LSIV3_T_RAID0 0x00
#define LSIV3_T_RAID1 0x01
u_int8_t dummy_0;
u_int8_t total_disks;
u_int8_t array_width;
u_int8_t filler_0[10];
u_int32_t sectors;
u_int16_t dummy_1;
u_int32_t offset;
u_int16_t dummy_2;
u_int8_t device;
#define LSIV3_D_DEVICE 0x01
#define LSIV3_D_CHANNEL 0x10
u_int8_t dummy_3;
u_int8_t dummy_4;
u_int8_t dummy_5;
u_int8_t filler_1[16];
} __packed raid[8];
struct {
u_int32_t disk_sectors;
u_int32_t dummy_0;
u_int32_t dummy_1;
u_int8_t dummy_2;
u_int8_t dummy_3;
u_int8_t flags;
#define LSIV3_D_MIRROR 0x00
#define LSIV3_D_STRIPE 0xff
u_int8_t dummy_4;
} __packed disk[6];
u_int8_t filler_7[7];
u_int8_t device;
u_int32_t timestamp;
u_int8_t filler_8[3];
u_int8_t checksum_1;
} __packed;
/* nVidia MediaShield Metadata */
#define NVIDIA_LBA(dev) \
(((struct ad_softc *)device_get_ivars(dev))->total_secs - 2)
struct nvidia_raid_conf {
u_int8_t nvidia_id[8];
#define NV_MAGIC "NVIDIA "
u_int32_t config_size;
u_int32_t checksum;
u_int16_t version;
u_int8_t disk_number;
u_int8_t dummy_0;
u_int32_t total_sectors;
u_int32_t sector_size;
u_int8_t serial[16];
u_int8_t revision[4];
u_int32_t dummy_1;
u_int32_t magic_0;
#define NV_MAGIC0 0x00640044
u_int64_t magic_1;
u_int64_t magic_2;
u_int8_t flags;
u_int8_t array_width;
u_int8_t total_disks;
u_int8_t dummy_2;
u_int16_t type;
#define NV_T_RAID0 0x00000080
#define NV_T_RAID1 0x00000081
#define NV_T_RAID3 0x00000083
#define NV_T_RAID5 0x00000085
#define NV_T_RAID01 0x00008180
#define NV_T_SPAN 0x000000ff
u_int16_t dummy_3;
u_int32_t stripe_sectors;
u_int32_t stripe_bytes;
u_int32_t stripe_shift;
u_int32_t stripe_mask;
u_int32_t stripe_sizesectors;
u_int32_t stripe_sizebytes;
u_int32_t rebuild_lba;
u_int32_t dummy_4;
u_int32_t dummy_5;
u_int32_t status;
#define NV_S_BOOTABLE 0x00000001
#define NV_S_DEGRADED 0x00000002
u_int32_t filler[98];
} __packed;
/* Promise FastTrak Metadata */
#define PR_LBA(dev) \
(((((struct ad_softc *)device_get_ivars(dev))->total_secs / (((struct ad_softc *)device_get_ivars(dev))->heads * ((struct ad_softc *)device_get_ivars(dev))->sectors)) * ((struct ad_softc *)device_get_ivars(dev))->heads * ((struct ad_softc *)device_get_ivars(dev))->sectors) - ((struct ad_softc *)device_get_ivars(dev))->sectors)
struct promise_raid_conf {
char promise_id[24];
#define PR_MAGIC "Promise Technology, Inc."
u_int32_t dummy_0;
u_int64_t magic_0;
#define PR_MAGIC0(x) (((u_int64_t)(x.channel) << 48) | \
((u_int64_t)(x.device != 0) << 56))
u_int16_t magic_1;
u_int32_t magic_2;
u_int8_t filler1[470];
struct {
u_int32_t integrity;
#define PR_I_VALID 0x00000080
u_int8_t flags;
#define PR_F_VALID 0x00000001
#define PR_F_ONLINE 0x00000002
#define PR_F_ASSIGNED 0x00000004
#define PR_F_SPARE 0x00000008
#define PR_F_DUPLICATE 0x00000010
#define PR_F_REDIR 0x00000020
#define PR_F_DOWN 0x00000040
#define PR_F_READY 0x00000080
u_int8_t disk_number;
u_int8_t channel;
u_int8_t device;
u_int64_t magic_0 __packed;
u_int32_t disk_offset;
u_int32_t disk_sectors;
u_int32_t rebuild_lba;
u_int16_t generation;
u_int8_t status;
#define PR_S_VALID 0x01
#define PR_S_ONLINE 0x02
#define PR_S_INITED 0x04
#define PR_S_READY 0x08
#define PR_S_DEGRADED 0x10
#define PR_S_MARKED 0x20
#define PR_S_FUNCTIONAL 0x80
u_int8_t type;
#define PR_T_RAID0 0x00
#define PR_T_RAID1 0x01
#define PR_T_RAID3 0x02
#define PR_T_RAID5 0x04
#define PR_T_SPAN 0x08
#define PR_T_JBOD 0x10
u_int8_t total_disks;
u_int8_t stripe_shift;
u_int8_t array_width;
u_int8_t array_number;
u_int32_t total_sectors;
u_int16_t cylinders;
u_int8_t heads;
u_int8_t sectors;
u_int64_t magic_1 __packed;
struct {
u_int8_t flags;
u_int8_t dummy_0;
u_int8_t channel;
u_int8_t device;
u_int64_t magic_0 __packed;
} disk[8];
} raid;
int32_t filler2[346];
u_int32_t checksum;
} __packed;
/* Silicon Image Medley Metadata */
#define SII_LBA(dev) \
( ((struct ad_softc *)device_get_ivars(dev))->total_secs - 1)
struct sii_raid_conf {
u_int16_t ata_params_00_53[54];
u_int64_t total_sectors;
u_int16_t ata_params_58_79[70];
u_int16_t dummy_0;
u_int16_t dummy_1;
u_int32_t controller_pci_id;
u_int16_t version_minor;
u_int16_t version_major;
u_int8_t timestamp[6];
u_int16_t stripe_sectors;
u_int16_t dummy_2;
u_int8_t disk_number;
u_int8_t type;
#define SII_T_RAID0 0x00
#define SII_T_RAID1 0x01
#define SII_T_RAID01 0x02
#define SII_T_SPARE 0x03
u_int8_t raid0_disks;
u_int8_t raid0_ident;
u_int8_t raid1_disks;
u_int8_t raid1_ident;
u_int64_t rebuild_lba;
u_int32_t generation;
u_int8_t status;
#define SII_S_READY 0x01
u_int8_t base_raid1_position;
u_int8_t base_raid0_position;
u_int8_t position;
u_int16_t dummy_3;
u_int8_t name[16];
u_int16_t checksum_0;
int8_t filler1[190];
u_int16_t checksum_1;
} __packed;
/* Silicon Integrated Systems RAID Metadata */
#define SIS_LBA(dev) \
( ((struct ad_softc *)device_get_ivars(dev))->total_secs - 16)
struct sis_raid_conf {
u_int16_t magic;
#define SIS_MAGIC 0x0010
u_int8_t disks;
#define SIS_D_MASTER 0xf0
#define SIS_D_MIRROR 0x0f
u_int8_t type_total_disks;
#define SIS_D_MASK 0x0f
#define SIS_T_MASK 0xf0
#define SIS_T_JBOD 0x10
#define SIS_T_RAID0 0x20
#define SIS_T_RAID1 0x30
u_int32_t dummy_0;
u_int32_t controller_pci_id;
u_int16_t stripe_sectors;
u_int16_t dummy_1;
u_int32_t timestamp;
u_int8_t model[40];
u_int8_t disk_number;
u_int8_t dummy_2[3];
int8_t filler1[448];
} __packed;
/* VIA Tech V-RAID Metadata */
#define VIA_LBA(dev) \
( ((struct ad_softc *)device_get_ivars(dev))->total_secs - 1)
struct via_raid_conf {
u_int16_t magic;
#define VIA_MAGIC 0xaa55
u_int8_t dummy_0;
u_int8_t type;
#define VIA_T_MASK 0xfe
#define VIA_T_BOOTABLE 0x01
#define VIA_T_RAID0 0x04
#define VIA_T_RAID1 0x0c
#define VIA_T_SPAN 0x44
u_int8_t disk_index;
#define VIA_D_MASK 0x0f
#define VIA_D_DEGRADED 0x10
u_int8_t stripe_layout;
#define VIA_L_MASK 0x07
#define VIA_L_SHIFT 4
u_int64_t total_sectors;
u_int32_t disk_id;
u_int32_t disks[8];
u_int8_t checksum;
u_int8_t filler_1[461];
} __packed;
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