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- /* scsi.c - scsi support. */
- /*
- * GRUB -- GRand Unified Bootloader
- * Copyright (C) 2008,2009 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/disk.h>
- #include <grub/dl.h>
- #include <grub/kernel.h>
- #include <grub/misc.h>
- #include <grub/mm.h>
- #include <grub/types.h>
- #include <grub/scsi.h>
- #include <grub/scsicmd.h>
- GRUB_EXPORT(grub_scsi_dev_register);
- GRUB_EXPORT(grub_scsi_dev_unregister);
- static grub_scsi_dev_t grub_scsi_dev_list;
- void
- grub_scsi_dev_register (grub_scsi_dev_t dev)
- {
- dev->next = grub_scsi_dev_list;
- grub_scsi_dev_list = dev;
- }
- void
- grub_scsi_dev_unregister (grub_scsi_dev_t dev)
- {
- grub_scsi_dev_t *p, q;
- for (p = &grub_scsi_dev_list, q = *p; q; p = &(q->next), q = q->next)
- if (q == dev)
- {
- *p = q->next;
- break;
- }
- }
- /* Determine the the device is removable and the type of the device
- SCSI. */
- static grub_err_t
- grub_scsi_inquiry (grub_scsi_t scsi)
- {
- struct grub_scsi_inquiry iq;
- struct grub_scsi_inquiry_data iqd;
- grub_err_t err;
- iq.opcode = grub_scsi_cmd_inquiry;
- iq.lun = scsi->lun << GRUB_SCSI_LUN_SHIFT;
- iq.reserved = 0;
- iq.alloc_length = 0x24; /* XXX: Hardcoded for now */
- iq.reserved2 = 0;
- err = scsi->dev->read (scsi, sizeof (iq), (char *) &iq,
- sizeof (iqd), (char *) &iqd);
- if (err)
- return err;
- scsi->devtype = iqd.devtype & GRUB_SCSI_DEVTYPE_MASK;
- scsi->removable = iqd.rmb >> GRUB_SCSI_REMOVABLE_BIT;
- return GRUB_ERR_NONE;
- }
- /* Read the capacity and block size of SCSI. */
- static grub_err_t
- grub_scsi_read_capacity (grub_scsi_t scsi)
- {
- struct grub_scsi_read_capacity rc;
- struct grub_scsi_read_capacity_data rcd;
- grub_err_t err;
- rc.opcode = grub_scsi_cmd_read_capacity;
- rc.lun = scsi->lun << GRUB_SCSI_LUN_SHIFT;
- grub_memset (rc.reserved, 0, sizeof (rc.reserved));
- err = scsi->dev->read (scsi, sizeof (rc), (char *) &rc,
- sizeof (rcd), (char *) &rcd);
- if (err)
- return err;
- scsi->size = grub_be_to_cpu32 (rcd.size);
- scsi->blocksize = grub_be_to_cpu32 (rcd.blocksize);
- return GRUB_ERR_NONE;
- }
- /* Send a SCSI request for DISK: read SIZE sectors starting with
- sector SECTOR to BUF. */
- static grub_err_t
- grub_scsi_read10 (grub_disk_t disk, grub_disk_addr_t sector,
- grub_size_t size, char *buf)
- {
- grub_scsi_t scsi;
- struct grub_scsi_read10 rd;
- scsi = disk->data;
- rd.opcode = grub_scsi_cmd_read10;
- rd.lun = scsi->lun << GRUB_SCSI_LUN_SHIFT;
- rd.lba = grub_cpu_to_be32 (sector);
- rd.reserved = 0;
- rd.size = grub_cpu_to_be16 (size);
- rd.reserved2 = 0;
- rd.pad = 0;
- return scsi->dev->read (scsi, sizeof (rd), (char *) &rd, size * scsi->blocksize, buf);
- }
- /* Send a SCSI request for DISK: read SIZE sectors starting with
- sector SECTOR to BUF. */
- static grub_err_t
- grub_scsi_read12 (grub_disk_t disk, grub_disk_addr_t sector,
- grub_size_t size, char *buf)
- {
- grub_scsi_t scsi;
- struct grub_scsi_read12 rd;
- scsi = disk->data;
- rd.opcode = grub_scsi_cmd_read12;
- rd.lun = scsi->lun << GRUB_SCSI_LUN_SHIFT;
- rd.lba = grub_cpu_to_be32 (sector);
- rd.size = grub_cpu_to_be32 (size);
- rd.reserved = 0;
- rd.control = 0;
- return scsi->dev->read (scsi, sizeof (rd), (char *) &rd, size * scsi->blocksize, buf);
- }
- #if 0
- /* Send a SCSI request for DISK: write the data stored in BUF to SIZE
- sectors starting with SECTOR. */
- static grub_err_t
- grub_scsi_write10 (grub_disk_t disk, grub_disk_addr_t sector,
- grub_size_t size, char *buf)
- {
- grub_scsi_t scsi;
- struct grub_scsi_write10 wr;
- scsi = disk->data;
- wr.opcode = grub_scsi_cmd_write10;
- wr.lun = scsi->lun << GRUB_SCSI_LUN_SHIFT;
- wr.lba = grub_cpu_to_be32 (sector);
- wr.reserved = 0;
- wr.size = grub_cpu_to_be16 (size);
- wr.reserved2 = 0;
- wr.pad = 0;
- return scsi->dev->write (scsi, sizeof (wr), (char *) &wr, size * scsi->blocksize, buf);
- }
- /* Send a SCSI request for DISK: write the data stored in BUF to SIZE
- sectors starting with SECTOR. */
- static grub_err_t
- grub_scsi_write12 (grub_disk_t disk, grub_disk_addr_t sector,
- grub_size_t size, char *buf)
- {
- grub_scsi_t scsi;
- struct grub_scsi_write10 wr;
- scsi = disk->data;
- wr.opcode = grub_scsi_cmd_write12;
- wr.lun = scsi->lun << GRUB_SCSI_LUN_SHIFT;
- wr.lba = grub_cpu_to_be32 (sector);
- wr.size = grub_cpu_to_be32 (size);
- wr.reserved = 0;
- wr.pad = 0;
- return scsi->dev->write (scsi, sizeof (wr), (char *) &wr, size * scsi->blocksize, buf);
- }
- #endif
- struct grub_scsi_iterate_closure
- {
- int (*hook) (const char *name, void *closure);
- void *closure;
- };
- static int
- scsi_iterate (const char *name, int luns, void *closure)
- {
- struct grub_scsi_iterate_closure *c = closure;
- int i;
- /* In case of a single LUN, just return `usbX'. */
- if (luns == 1)
- return c->hook (name, c->closure);
- /* In case of multiple LUNs, every LUN will get a prefix to
- distinguish it. */
- for (i = 0; i < luns; i++)
- {
- char *sname;
- int ret;
- sname = grub_xasprintf ("%s%c", name, 'a' + i);
- if (!sname)
- return 1;
- ret = c->hook (sname, c->closure);
- grub_free (sname);
- if (ret)
- return 1;
- }
- return 0;
- }
- static int
- grub_scsi_iterate (int (*hook) (const char *name, void *closure),
- void *closure)
- {
- grub_scsi_dev_t p;
- struct grub_scsi_iterate_closure c;
- c.hook = hook;
- c.closure = closure;
- for (p = grub_scsi_dev_list; p; p = p->next)
- if (p->iterate && (p->iterate) (scsi_iterate, &c))
- return 1;
- return 0;
- }
- static grub_err_t
- grub_scsi_open (const char *name, grub_disk_t disk)
- {
- grub_scsi_dev_t p;
- grub_scsi_t scsi;
- grub_err_t err;
- int len;
- int lun;
- scsi = grub_malloc (sizeof (*scsi));
- if (! scsi)
- return grub_errno;
- len = grub_strlen (name);
- lun = name[len - 1] - 'a';
- /* Try to detect a LUN ('a'-'z'), otherwise just use the first
- LUN. */
- if (lun < 0 || lun > 26)
- lun = 0;
- for (p = grub_scsi_dev_list; p; p = p->next)
- {
- if (p->open (name, scsi))
- continue;
- disk->id = (unsigned long) "scsi"; /* XXX */
- disk->data = scsi;
- scsi->dev = p;
- scsi->lun = lun;
- scsi->name = grub_strdup (name);
- if (! scsi->name)
- {
- grub_free (scsi);
- return grub_errno;
- }
- grub_dprintf ("scsi", "dev opened\n");
- err = grub_scsi_inquiry (scsi);
- if (err)
- {
- grub_free (scsi);
- grub_dprintf ("scsi", "inquiry failed\n");
- return err;
- }
- grub_dprintf ("scsi", "inquiry: devtype=0x%02x removable=%d\n",
- scsi->devtype, scsi->removable);
- /* Try to be conservative about the device types
- supported. */
- if (scsi->devtype != grub_scsi_devtype_direct
- && scsi->devtype != grub_scsi_devtype_cdrom)
- {
- grub_free (scsi);
- return grub_error (GRUB_ERR_UNKNOWN_DEVICE,
- "unknown SCSI device");
- }
- if (scsi->devtype == grub_scsi_devtype_cdrom)
- disk->has_partitions = 0;
- else
- disk->has_partitions = 1;
- err = grub_scsi_read_capacity (scsi);
- if (err)
- {
- grub_free (scsi);
- grub_dprintf ("scsi", "READ CAPACITY failed\n");
- return err;
- }
- /* SCSI blocks can be something else than 512, although GRUB
- wants 512 byte blocks. */
- disk->total_sectors = ((scsi->size * scsi->blocksize)
- << GRUB_DISK_SECTOR_BITS);
- grub_dprintf ("scsi", "capacity=%llu, blksize=%d\n",
- (unsigned long long) disk->total_sectors,
- scsi->blocksize);
- return GRUB_ERR_NONE;
- }
- grub_free (scsi);
- return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "not a SCSI disk");
- }
- static void
- grub_scsi_close (grub_disk_t disk)
- {
- grub_scsi_t scsi;
- scsi = disk->data;
- scsi->dev->close (scsi);
- grub_free (scsi);
- }
- static grub_err_t
- grub_scsi_read (grub_disk_t disk, grub_disk_addr_t sector,
- grub_size_t size, char *buf)
- {
- grub_scsi_t scsi;
- scsi = disk->data;
- /* SCSI sectors are variable in size. GRUB uses 512 byte
- sectors. */
- if (scsi->blocksize != GRUB_DISK_SECTOR_SIZE)
- {
- unsigned spb = scsi->blocksize >> GRUB_DISK_SECTOR_BITS;
- if (! (spb != 0 && (scsi->blocksize & GRUB_DISK_SECTOR_SIZE) == 0))
- return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
- "unsupported SCSI block size");
- grub_uint32_t sector_mod = 0;
- sector = grub_divmod64 (sector, spb, §or_mod);
- if (! (sector_mod == 0 && size % spb == 0))
- return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
- "unaligned SCSI read not supported");
- size /= spb;
- }
- /* Depending on the type, select a read function. */
- switch (scsi->devtype)
- {
- case grub_scsi_devtype_direct:
- return grub_scsi_read10 (disk, sector, size, buf);
- case grub_scsi_devtype_cdrom:
- return grub_scsi_read12 (disk, sector, size, buf);
- }
- /* XXX: Never reached. */
- return GRUB_ERR_NONE;
- }
- static grub_err_t
- grub_scsi_write (grub_disk_t disk __attribute((unused)),
- grub_disk_addr_t sector __attribute((unused)),
- grub_size_t size __attribute((unused)),
- const char *buf __attribute((unused)))
- {
- #if 0
- /* XXX: Not tested yet! */
- /* XXX: This should depend on the device type? */
- return grub_scsi_write10 (disk, sector, size, buf);
- #endif
- return GRUB_ERR_NOT_IMPLEMENTED_YET;
- }
- static struct grub_disk_dev grub_scsi_dev =
- {
- .name = "scsi",
- .id = GRUB_DISK_DEVICE_SCSI_ID,
- .iterate = grub_scsi_iterate,
- .open = grub_scsi_open,
- .close = grub_scsi_close,
- .read = grub_scsi_read,
- .write = grub_scsi_write,
- .next = 0
- };
- GRUB_MOD_INIT(scsi)
- {
- grub_disk_dev_register (&grub_scsi_dev);
- }
- GRUB_MOD_FINI(scsi)
- {
- grub_disk_dev_unregister (&grub_scsi_dev);
- }
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