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108 lines
3.6 KiB
C
108 lines
3.6 KiB
C
/* ata_pthru.c - ATA pass through for ata.mod. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/ata.h>
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#include <grub/disk.h>
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#include <grub/dl.h>
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#include <grub/mm.h>
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/* ATA pass through support, used by hdparm.mod. */
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static grub_err_t
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grub_ata_pass_through (grub_disk_t disk,
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struct grub_disk_ata_pass_through_parms *parms)
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{
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if (disk->dev->id != GRUB_DISK_DEVICE_ATA_ID)
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return grub_error (GRUB_ERR_BAD_DEVICE,
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"device not accessed via ata.mod");
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struct grub_ata_device *dev = (struct grub_ata_device *) disk->data;
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if (! (parms->size == 0 || parms->size == GRUB_DISK_SECTOR_SIZE))
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return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
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"ATA multi-sector read and DATA OUT not implemented");
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grub_dprintf ("ata", "ata_pass_through: cmd=0x%x, features=0x%x, sectors=0x%x\n",
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parms->taskfile[GRUB_ATA_REG_CMD],
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parms->taskfile[GRUB_ATA_REG_FEATURES],
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parms->taskfile[GRUB_ATA_REG_SECTORS]);
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grub_dprintf ("ata", "lba_high=0x%x, lba_mid=0x%x, lba_low=0x%x, size=%d\n",
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parms->taskfile[GRUB_ATA_REG_LBAHIGH],
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parms->taskfile[GRUB_ATA_REG_LBAMID],
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parms->taskfile[GRUB_ATA_REG_LBALOW], parms->size);
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/* Set registers. */
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grub_ata_regset (dev, GRUB_ATA_REG_DISK, 0xE0 | dev->device << 4
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| (parms->taskfile[GRUB_ATA_REG_DISK] & 0xf));
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if (grub_ata_check_ready (dev))
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return grub_errno;
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int i;
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for (i = GRUB_ATA_REG_FEATURES; i <= GRUB_ATA_REG_LBAHIGH; i++)
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grub_ata_regset (dev, i, parms->taskfile[i]);
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/* Start command. */
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grub_ata_regset (dev, GRUB_ATA_REG_CMD, parms->taskfile[GRUB_ATA_REG_CMD]);
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/* Wait for !BSY. */
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if (grub_ata_wait_not_busy (dev, GRUB_ATA_TOUT_DATA))
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return grub_errno;
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/* Check status. */
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grub_int8_t sts = grub_ata_regget (dev, GRUB_ATA_REG_STATUS);
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grub_dprintf ("ata", "status=0x%x\n", sts);
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/* Transfer data. */
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if ((sts & (GRUB_ATA_STATUS_DRQ | GRUB_ATA_STATUS_ERR)) == GRUB_ATA_STATUS_DRQ)
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{
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if (parms->size != GRUB_DISK_SECTOR_SIZE)
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return grub_error (GRUB_ERR_READ_ERROR, "DRQ unexpected");
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grub_ata_pio_read (dev, parms->buffer, GRUB_DISK_SECTOR_SIZE);
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}
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/* Return registers. */
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for (i = GRUB_ATA_REG_ERROR; i <= GRUB_ATA_REG_STATUS; i++)
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parms->taskfile[i] = grub_ata_regget (dev, i);
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grub_dprintf ("ata", "status=0x%x, error=0x%x, sectors=0x%x\n",
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parms->taskfile[GRUB_ATA_REG_STATUS],
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parms->taskfile[GRUB_ATA_REG_ERROR],
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parms->taskfile[GRUB_ATA_REG_SECTORS]);
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if (parms->taskfile[GRUB_ATA_REG_STATUS]
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& (GRUB_ATA_STATUS_DRQ | GRUB_ATA_STATUS_ERR))
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return grub_error (GRUB_ERR_READ_ERROR, "ATA passthrough failed");
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return GRUB_ERR_NONE;
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}
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GRUB_MOD_INIT(ata_pthru)
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{
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/* Register ATA pass through function. */
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grub_disk_ata_pass_through = grub_ata_pass_through;
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}
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GRUB_MOD_FINI(ata_pthru)
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{
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if (grub_disk_ata_pass_through == grub_ata_pass_through)
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grub_disk_ata_pass_through = NULL;
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}
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