9ec92aaf1f
* disk/ata.c: Include <grub/pci.h>. (enum grub_ata_commands): Add `GRUB_ATA_CMD_EXEC_DEV_DIAGNOSTICS'. (grub_ata_initialize): Rewritten. (grub_ata_device_initialize): New function.
848 lines
21 KiB
C
848 lines
21 KiB
C
/* ata.c - ATA disk access. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2007, 2008 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/dl.h>
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#include <grub/misc.h>
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#include <grub/disk.h>
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#include <grub/mm.h>
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#include <grub/time.h>
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#include <grub/pci.h>
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/* XXX: For now this only works on i386. */
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#include <grub/cpu/io.h>
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typedef enum
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{
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GRUB_ATA_CHS,
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GRUB_ATA_LBA,
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GRUB_ATA_LBA48
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} grub_ata_addressing_t;
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/* At the moment, only two IDE ports are supported. */
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static const int grub_ata_ioaddress[] = { 0x1f0, 0x170 };
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static const int grub_ata_ioaddress2[] = { 0x3f6, 0x376 };
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#define GRUB_CDROM_SECTOR_SIZE 2048
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#define GRUB_ATA_REG_DATA 0
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#define GRUB_ATA_REG_ERROR 1
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#define GRUB_ATA_REG_FEATURES 1
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#define GRUB_ATA_REG_SECTORS 2
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#define GRUB_ATA_REG_SECTNUM 3
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#define GRUB_ATA_REG_CYLLSB 4
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#define GRUB_ATA_REG_CYLMSB 5
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#define GRUB_ATA_REG_LBALOW 3
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#define GRUB_ATA_REG_LBAMID 4
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#define GRUB_ATA_REG_LBAHIGH 5
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#define GRUB_ATA_REG_DISK 6
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#define GRUB_ATA_REG_CMD 7
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#define GRUB_ATA_REG_STATUS 7
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#define GRUB_ATA_REG2_CONTROL 0
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#define GRUB_ATA_STATUS_ERR 0x01
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#define GRUB_ATA_STATUS_INDEX 0x02
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#define GRUB_ATA_STATUS_ECC 0x04
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#define GRUB_ATA_STATUS_DRQ 0x08
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#define GRUB_ATA_STATUS_SEEK 0x10
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#define GRUB_ATA_STATUS_WRERR 0x20
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#define GRUB_ATA_STATUS_READY 0x40
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#define GRUB_ATA_STATUS_BUSY 0x80
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enum grub_ata_commands
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{
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GRUB_ATA_CMD_READ_SECTORS = 0x20,
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GRUB_ATA_CMD_READ_SECTORS_EXT = 0x24,
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GRUB_ATA_CMD_WRITE_SECTORS = 0x30,
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GRUB_ATA_CMD_WRITE_SECTORS_EXT = 0x34,
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GRUB_ATA_CMD_IDENTIFY_DEVICE = 0xEC,
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GRUB_ATA_CMD_IDENTIFY_PACKET_DEVICE = 0xA1,
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GRUB_ATA_CMD_PACKET = 0xA0,
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GRUB_ATA_CMD_EXEC_DEV_DIAGNOSTICS = 0x90
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};
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struct grub_ata_device
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{
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/* IDE port to use. */
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int port;
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/* IO addresses on which the registers for this device can be
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found. */
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int ioaddress;
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int ioaddress2;
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/* Two devices can be connected to a single cable. Use this field
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to select device 0 (commonly known as "master") or device 1
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(commonly known as "slave"). */
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int device;
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/* Addressing methods available for accessing this device. If CHS
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is only available, use that. Otherwise use LBA, except for the
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high sectors. In that case use LBA48. */
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grub_ata_addressing_t addr;
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/* Sector count. */
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grub_uint64_t size;
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/* CHS maximums. */
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grub_uint16_t cylinders;
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grub_uint16_t heads;
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grub_uint16_t sectors_per_track;
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/* Set to 0 for ATA, set to 1 for ATAPI. */
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int atapi;
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struct grub_ata_device *next;
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};
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static struct grub_ata_device *grub_ata_devices;
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static inline void
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grub_ata_regset (struct grub_ata_device *dev, int reg, int val)
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{
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grub_outb (val, dev->ioaddress + reg);
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}
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static inline int
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grub_ata_regget (struct grub_ata_device *dev, int reg)
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{
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return grub_inb (dev->ioaddress + reg);
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}
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static inline void
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grub_ata_regset2 (struct grub_ata_device *dev, int reg, int val)
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{
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grub_outb (val, dev->ioaddress2 + reg);
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}
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static inline int
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grub_ata_regget2 (struct grub_ata_device *dev, int reg)
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{
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return grub_inb (dev->ioaddress2 + reg);
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}
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/* Wait until the device DEV has the status set to ready. */
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static inline void
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grub_ata_wait_busy (struct grub_ata_device *dev)
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{
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while ((grub_ata_regget (dev, GRUB_ATA_REG_STATUS) & GRUB_ATA_STATUS_BUSY));
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}
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static inline void
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grub_ata_wait_drq (struct grub_ata_device *dev)
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{
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while (! (grub_ata_regget (dev, GRUB_ATA_REG_STATUS) & GRUB_ATA_STATUS_DRQ));
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}
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static inline void
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grub_ata_wait (void)
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{
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grub_millisleep (50);
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}
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/* Byteorder has to be changed before strings can be read. */
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static inline void
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grub_ata_strncpy (char *dst, char *src, grub_size_t len)
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{
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grub_uint16_t *src16 = (grub_uint16_t *) src;
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grub_uint16_t *dst16 = (grub_uint16_t *) dst;
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unsigned int i;
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for (i = 0; i < len / 2; i++)
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*(dst16++) = grub_be_to_cpu16(*(src16++));
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dst[len] = '\0';
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}
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static int
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grub_ata_pio_read (struct grub_ata_device *dev, char *buf,
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grub_size_t size)
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{
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grub_uint16_t *buf16 = (grub_uint16_t *) buf;
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unsigned int i;
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if (grub_ata_regget (dev, GRUB_ATA_REG_STATUS) & GRUB_ATA_STATUS_ERR)
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return grub_ata_regget (dev, GRUB_ATA_REG_ERROR);
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/* Wait until the data is available. */
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grub_ata_wait_drq (dev);
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/* Read in the data, word by word. */
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for (i = 0; i < size / 2; i++)
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buf16[i] = grub_le_to_cpu16 (grub_inw(dev->ioaddress + GRUB_ATA_REG_DATA));
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if (grub_ata_regget (dev, GRUB_ATA_REG_STATUS) & GRUB_ATA_STATUS_ERR)
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return grub_ata_regget (dev, GRUB_ATA_REG_ERROR);
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return 0;
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}
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static grub_err_t
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grub_ata_pio_write (struct grub_ata_device *dev, char *buf,
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grub_size_t size)
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{
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grub_uint16_t *buf16 = (grub_uint16_t *) buf;
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unsigned int i;
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if (grub_ata_regget (dev, GRUB_ATA_REG_STATUS) & GRUB_ATA_STATUS_ERR)
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return grub_ata_regget (dev, GRUB_ATA_REG_ERROR);
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/* Wait until the device is ready to write. */
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grub_ata_wait_drq (dev);
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/* Write the data, word by word. */
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for (i = 0; i < size / 2; i++)
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grub_outw(grub_cpu_to_le16 (buf16[i]), dev->ioaddress + GRUB_ATA_REG_DATA);
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if (grub_ata_regget (dev, GRUB_ATA_REG_STATUS) & GRUB_ATA_STATUS_ERR)
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return grub_ata_regget (dev, GRUB_ATA_REG_ERROR);
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return 0;
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}
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static void
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grub_ata_dumpinfo (struct grub_ata_device *dev, char *info)
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{
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char text[41];
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/* The device information was read, dump it for debugging. */
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grub_ata_strncpy (text, info + 20, 20);
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grub_dprintf ("ata", "Serial: %s\n", text);
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grub_ata_strncpy (text, info + 46, 8);
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grub_dprintf ("ata", "Firmware: %s\n", text);
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grub_ata_strncpy (text, info + 54, 40);
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grub_dprintf ("ata", "Model: %s\n", text);
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if (! dev->atapi)
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{
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grub_dprintf ("ata", "Addressing: %d\n", dev->addr);
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grub_dprintf ("ata", "Sectors: %lld\n", dev->size);
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}
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}
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static grub_err_t
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grub_atapi_identify (struct grub_ata_device *dev)
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{
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char *info;
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info = grub_malloc (256);
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if (! info)
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return grub_errno;
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grub_ata_wait_busy (dev);
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grub_ata_regset (dev, GRUB_ATA_REG_DISK, 0xE0 | dev->device << 4);
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grub_ata_regset (dev, GRUB_ATA_REG_CMD,
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GRUB_ATA_CMD_IDENTIFY_PACKET_DEVICE);
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grub_ata_wait ();
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grub_ata_pio_read (dev, info, 256);
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dev->atapi = 1;
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grub_ata_dumpinfo (dev, info);
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grub_free (info);
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return 0;
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}
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static grub_err_t
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grub_atapi_packet (struct grub_ata_device *dev, char *packet)
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{
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grub_ata_regset (dev, GRUB_ATA_REG_DISK, dev->device << 4);
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grub_ata_regset (dev, GRUB_ATA_REG_FEATURES, 0);
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grub_ata_regset (dev, GRUB_ATA_REG_SECTORS, 0);
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grub_ata_regset (dev, GRUB_ATA_REG_LBAHIGH, 0xFF);
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grub_ata_regset (dev, GRUB_ATA_REG_LBAMID, 0xFF);
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grub_ata_regset (dev, GRUB_ATA_REG_CMD, GRUB_ATA_CMD_PACKET);
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grub_ata_wait ();
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grub_ata_pio_write (dev, packet, 12);
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return 0;
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}
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static grub_err_t
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grub_ata_identify (struct grub_ata_device *dev)
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{
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char *info;
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grub_uint16_t *info16;
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int ataerr;
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info = grub_malloc (GRUB_DISK_SECTOR_SIZE);
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if (! info)
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return grub_errno;
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info16 = (grub_uint16_t *) info;
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grub_ata_wait_busy (dev);
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grub_ata_regset (dev, GRUB_ATA_REG_DISK, 0xE0 | dev->device << 4);
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grub_ata_regset (dev, GRUB_ATA_REG_CMD, GRUB_ATA_CMD_IDENTIFY_DEVICE);
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grub_ata_wait ();
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ataerr = grub_ata_pio_read (dev, info, GRUB_DISK_SECTOR_SIZE);
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if (ataerr & 4)
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{
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/* ATAPI device detected. */
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grub_free(info);
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return grub_atapi_identify (dev);
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}
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else if (ataerr)
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{
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/* Error. */
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grub_free(info);
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return grub_error (GRUB_ERR_UNKNOWN_DEVICE,
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"device can not be identified");
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}
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/* Now it is certain that this is not an ATAPI device. */
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dev->atapi = 0;
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/* CHS is always supported. */
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dev->addr = GRUB_ATA_CHS;
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/* Check if LBA is supported. */
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if (info16[49] & (1 << 9))
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{
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/* Check if LBA48 is supported. */
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if (info16[83] & (1 << 10))
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dev->addr = GRUB_ATA_LBA48;
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else
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dev->addr = GRUB_ATA_LBA;
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}
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/* Determine the amount of sectors. */
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if (dev->addr != GRUB_ATA_LBA48)
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dev->size = grub_le_to_cpu32(*((grub_uint32_t *) &info16[60]));
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else
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dev->size = grub_le_to_cpu64(*((grub_uint64_t *) &info16[100]));
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/* Read CHS information. */
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dev->cylinders = info16[1];
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dev->heads = info16[3];
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dev->sectors_per_track = info16[6];
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grub_ata_dumpinfo (dev, info);
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grub_free(info);
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return 0;
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}
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static grub_err_t
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grub_ata_device_initialize (int port, int device, int addr, int addr2)
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{
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struct grub_ata_device *dev;
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struct grub_ata_device **devp;
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grub_dprintf ("ata", "detecting device %d,%d (0x%x, 0x%x)\n",
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port, device, addr, addr2);
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dev = grub_malloc (sizeof(*dev));
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if (! dev)
|
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return grub_errno;
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|
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/* Setup the device information. */
|
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dev->port = port;
|
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dev->device = device;
|
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dev->ioaddress = grub_ata_ioaddress[dev->port];
|
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dev->ioaddress2 = grub_ata_ioaddress2[dev->port];
|
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dev->next = NULL;
|
||
|
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/* Try to detect if the port is in use by writing to it,
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waiting for a while and reading it again. If the value
|
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was preserved, there is a device connected. */
|
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grub_ata_regset (dev, GRUB_ATA_REG_DISK, dev->device << 4);
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grub_ata_wait ();
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grub_ata_regset (dev, GRUB_ATA_REG_SECTORS, 0x5A);
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grub_ata_wait ();
|
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if (grub_ata_regget (dev, GRUB_ATA_REG_SECTORS) != 0x5A)
|
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{
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grub_free(dev);
|
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return 0;
|
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}
|
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/* Detect if the device is present by issuing a EXECUTE
|
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DEVICE DIAGNOSTICS command. */
|
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grub_ata_regset (dev, GRUB_ATA_REG_DISK, dev->device << 4);
|
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grub_ata_regset (dev, GRUB_ATA_REG_CMD,
|
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GRUB_ATA_CMD_EXEC_DEV_DIAGNOSTICS);
|
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grub_ata_wait ();
|
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|
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grub_dprintf ("ata", "Registers: %x %x %x %x\n",
|
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grub_ata_regget (dev, GRUB_ATA_REG_SECTORS),
|
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grub_ata_regget (dev, GRUB_ATA_REG_LBALOW),
|
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grub_ata_regget (dev, GRUB_ATA_REG_LBAMID),
|
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grub_ata_regget (dev, GRUB_ATA_REG_LBAHIGH));
|
||
|
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/* Check some registers to see if the channel is used. */
|
||
if (grub_ata_regget (dev, GRUB_ATA_REG_SECTORS) == 0x01
|
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&& grub_ata_regget (dev, GRUB_ATA_REG_LBALOW) == 0x01
|
||
&& grub_ata_regget (dev, GRUB_ATA_REG_LBAMID) == 0x14
|
||
&& grub_ata_regget (dev, GRUB_ATA_REG_LBAHIGH) == 0xeb)
|
||
{
|
||
grub_dprintf ("ata", "ATAPI signature detected\n");
|
||
}
|
||
else if (! (grub_ata_regget (dev, GRUB_ATA_REG_SECTORS) == 0x01
|
||
&& grub_ata_regget (dev, GRUB_ATA_REG_LBALOW) == 0x01
|
||
&& grub_ata_regget (dev, GRUB_ATA_REG_LBAMID) == 0x00
|
||
&& grub_ata_regget (dev, GRUB_ATA_REG_LBAHIGH) == 0x00))
|
||
{
|
||
grub_dprintf ("ata", "incorrect signature\n");
|
||
grub_free (dev);
|
||
return 0;
|
||
}
|
||
else
|
||
{
|
||
grub_dprintf ("ata", "ATA detected\n");
|
||
}
|
||
|
||
|
||
/* Use the IDENTIFY DEVICE command to query the device. */
|
||
if (grub_ata_identify (dev))
|
||
{
|
||
grub_free (dev);
|
||
return 0;
|
||
}
|
||
|
||
/* Register the device. */
|
||
for (devp = &grub_ata_devices; *devp; devp = &(*devp)->next);
|
||
*devp = dev;
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int
|
||
grub_ata_pciinit (int bus, int device, int func, grub_pci_id_t pciid)
|
||
{
|
||
static int compat_use[2] = { 0 };
|
||
grub_pci_address_t addr;
|
||
grub_uint32_t class;
|
||
grub_uint32_t bar1;
|
||
grub_uint32_t bar2;
|
||
int rega;
|
||
int regb;
|
||
int i;
|
||
|
||
/* Read class. */
|
||
addr = grub_pci_make_address (bus, device, func, 2);
|
||
class = grub_pci_read (addr);
|
||
|
||
/* Check if this class ID matches that of a PCI IDE Controller. */
|
||
if (class >> 16 != 0x0101)
|
||
return 0;
|
||
|
||
for (i = 0; i < 2; i++)
|
||
{
|
||
/* Set to 0 when the channel operated in compatibility mode. */
|
||
int compat = (class >> (2 * i)) & 1;
|
||
|
||
rega = 0;
|
||
regb = 0;
|
||
|
||
/* If the channel is in compatibility mode, just assign the
|
||
default registers. */
|
||
if (compat == 0 && !compat_use[i])
|
||
{
|
||
rega = grub_ata_ioaddress[i];
|
||
regb = grub_ata_ioaddress2[i];
|
||
compat_use[i] = 0;
|
||
}
|
||
else if (compat)
|
||
{
|
||
/* Read the BARs, which either contain a mmapped IO address
|
||
or the IO port address. */
|
||
addr = grub_pci_make_address (bus, device, func, 4 + 2 * i);
|
||
bar1 = grub_pci_read (addr);
|
||
addr = grub_pci_make_address (bus, device, func, 5 + 2 * i);
|
||
bar2 = grub_pci_read (addr);
|
||
|
||
/* Check if the BARs describe an IO region. */
|
||
if ((bar1 & 1) && (bar2 & 1))
|
||
{
|
||
rega = bar1 & ~3;
|
||
regb = bar2 & ~3;
|
||
}
|
||
}
|
||
|
||
grub_dprintf ("ata",
|
||
"PCI dev (%d,%d,%d) compat=%d rega=0x%x regb=0x%x\n",
|
||
bus, device, func, compat, rega, regb);
|
||
|
||
if (rega && regb)
|
||
{
|
||
grub_ata_device_initialize (i, 0, rega, regb);
|
||
grub_ata_device_initialize (i, 1, rega, regb);
|
||
}
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
static grub_err_t
|
||
grub_ata_initialize (void)
|
||
{
|
||
grub_pci_iterate (grub_ata_pciinit);
|
||
return 0;
|
||
}
|
||
|
||
|
||
static void
|
||
grub_ata_setlba (struct grub_ata_device *dev, grub_disk_addr_t sector,
|
||
grub_size_t size)
|
||
{
|
||
grub_ata_regset (dev, GRUB_ATA_REG_SECTORS, size);
|
||
grub_ata_regset (dev, GRUB_ATA_REG_LBALOW, sector & 0xFF);
|
||
grub_ata_regset (dev, GRUB_ATA_REG_LBAMID, (sector >> 8) & 0xFF);
|
||
grub_ata_regset (dev, GRUB_ATA_REG_LBAHIGH, (sector >> 16) & 0xFF);
|
||
}
|
||
|
||
static grub_err_t
|
||
grub_ata_setaddress (struct grub_ata_device *dev,
|
||
grub_ata_addressing_t addressing,
|
||
grub_disk_addr_t sector,
|
||
grub_size_t size)
|
||
{
|
||
grub_ata_wait_busy (dev);
|
||
|
||
switch (addressing)
|
||
{
|
||
case GRUB_ATA_CHS:
|
||
{
|
||
unsigned int cylinder;
|
||
unsigned int head;
|
||
unsigned int sect;
|
||
|
||
/* Calculate the sector, cylinder and head to use. */
|
||
sect = ((grub_uint32_t) sector % dev->sectors_per_track) + 1;
|
||
cylinder = (((grub_uint32_t) sector / dev->sectors_per_track)
|
||
/ dev->heads);
|
||
head = ((grub_uint32_t) sector / dev->sectors_per_track) % dev->heads;
|
||
|
||
if (sect > dev->sectors_per_track
|
||
|| cylinder > dev->cylinders
|
||
|| head > dev->heads)
|
||
return grub_error (GRUB_ERR_OUT_OF_RANGE,
|
||
"sector %d can not be addressed "
|
||
"using CHS addressing", sector);
|
||
|
||
grub_ata_regset (dev, GRUB_ATA_REG_SECTNUM, sect);
|
||
grub_ata_regset (dev, GRUB_ATA_REG_CYLLSB, cylinder & 0xFF);
|
||
grub_ata_regset (dev, GRUB_ATA_REG_CYLMSB, cylinder >> 8);
|
||
grub_ata_regset (dev, GRUB_ATA_REG_DISK, (dev->device << 4) | head);
|
||
|
||
break;
|
||
}
|
||
|
||
case GRUB_ATA_LBA:
|
||
if (size == 256)
|
||
size = 0;
|
||
grub_ata_setlba (dev, sector, size);
|
||
grub_ata_regset (dev, GRUB_ATA_REG_DISK,
|
||
0xE0 | (dev->device << 4) | ((sector >> 24) & 0x0F));
|
||
break;
|
||
|
||
case GRUB_ATA_LBA48:
|
||
if (size == 65536)
|
||
size = 0;
|
||
|
||
/* Set "Previous". */
|
||
grub_ata_setlba (dev, sector >> 24, size >> 8);
|
||
/* Set "Current". */
|
||
grub_ata_setlba (dev, sector, size);
|
||
grub_ata_regset (dev, GRUB_ATA_REG_DISK, 0xE0 | (dev->device << 4));
|
||
|
||
break;
|
||
}
|
||
|
||
return GRUB_ERR_NONE;
|
||
}
|
||
|
||
static grub_err_t
|
||
grub_ata_readwrite (grub_disk_t disk, grub_disk_addr_t sector,
|
||
grub_size_t size, char *buf, int rw)
|
||
{
|
||
struct grub_ata_device *dev = (struct grub_ata_device *) disk->data;
|
||
grub_size_t cnt;
|
||
grub_size_t batch;
|
||
grub_ata_addressing_t addressing;
|
||
int cmd;
|
||
int cmd_write;
|
||
unsigned int sect;
|
||
|
||
addressing = dev->addr;
|
||
|
||
if (addressing == GRUB_ATA_LBA48 && ((sector + size) >> 28) != 0)
|
||
{
|
||
batch = 65536;
|
||
cmd = GRUB_ATA_CMD_READ_SECTORS_EXT;
|
||
cmd_write = GRUB_ATA_CMD_WRITE_SECTORS_EXT;
|
||
}
|
||
else
|
||
{
|
||
if (addressing == GRUB_ATA_LBA48)
|
||
addressing = GRUB_ATA_LBA;
|
||
batch = 256;
|
||
cmd = GRUB_ATA_CMD_READ_SECTORS;
|
||
cmd_write = GRUB_ATA_CMD_WRITE_SECTORS;
|
||
}
|
||
|
||
cnt = size / batch;
|
||
|
||
/* Read/write batches of 256/65536 sectors, when more than 256/65536
|
||
sectors should be read/written. */
|
||
for (; cnt; cnt--)
|
||
{
|
||
if (grub_ata_setaddress (dev, addressing, sector, batch))
|
||
return grub_errno;
|
||
|
||
if (rw == 0)
|
||
{
|
||
/* Read 256/65536 sectors. */
|
||
grub_ata_regset (dev, GRUB_ATA_REG_CMD, cmd);
|
||
grub_ata_wait ();
|
||
for (sect = 0; sect < batch; sect++)
|
||
{
|
||
if (grub_ata_pio_read (dev, buf,
|
||
GRUB_DISK_SECTOR_SIZE))
|
||
return grub_error (GRUB_ERR_READ_ERROR, "ATA read error");
|
||
buf += GRUB_DISK_SECTOR_SIZE;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* Write 256/65536 sectors. */
|
||
grub_ata_regset (dev, GRUB_ATA_REG_CMD, cmd_write);
|
||
grub_ata_wait ();
|
||
for (sect = 0; sect < batch; sect++)
|
||
{
|
||
if (grub_ata_pio_write (dev, buf,
|
||
GRUB_DISK_SECTOR_SIZE))
|
||
return grub_error (GRUB_ERR_WRITE_ERROR, "ATA write error");
|
||
buf += GRUB_DISK_SECTOR_SIZE;
|
||
}
|
||
}
|
||
sector += batch;
|
||
}
|
||
|
||
/* Read/write just a "few" sectors. */
|
||
if (grub_ata_setaddress (dev, addressing, sector, size % batch))
|
||
return grub_errno;
|
||
|
||
if (rw == 0)
|
||
{
|
||
/* Read sectors. */
|
||
grub_ata_regset (dev, GRUB_ATA_REG_CMD, cmd);
|
||
grub_ata_wait ();
|
||
for (sect = 0; sect < (size % batch); sect++)
|
||
{
|
||
if (grub_ata_pio_read (dev, buf, GRUB_DISK_SECTOR_SIZE))
|
||
return grub_error (GRUB_ERR_READ_ERROR, "ATA read error");
|
||
buf += GRUB_DISK_SECTOR_SIZE;
|
||
}
|
||
} else {
|
||
/* Write sectors. */
|
||
grub_ata_regset (dev, GRUB_ATA_REG_CMD, cmd_write);
|
||
grub_ata_wait ();
|
||
for (sect = 0; sect < (size % batch); sect++)
|
||
{
|
||
if (grub_ata_pio_write (dev, buf, GRUB_DISK_SECTOR_SIZE))
|
||
return grub_error (GRUB_ERR_WRITE_ERROR, "ATA write error");
|
||
buf += GRUB_DISK_SECTOR_SIZE;
|
||
}
|
||
}
|
||
|
||
return GRUB_ERR_NONE;
|
||
}
|
||
|
||
|
||
|
||
static int
|
||
grub_ata_iterate (int (*hook) (const char *name))
|
||
{
|
||
struct grub_ata_device *dev;
|
||
|
||
for (dev = grub_ata_devices; dev; dev = dev->next)
|
||
{
|
||
char devname[5];
|
||
grub_sprintf (devname, "ata%d", dev->port * 2 + dev->device);
|
||
|
||
if (hook (devname))
|
||
return 1;
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
static grub_err_t
|
||
grub_ata_open (const char *name, grub_disk_t disk)
|
||
{
|
||
struct grub_ata_device *dev;
|
||
|
||
for (dev = grub_ata_devices; dev; dev = dev->next)
|
||
{
|
||
char devname[5];
|
||
grub_sprintf (devname, "ata%d", dev->port * 2 + dev->device);
|
||
if (grub_strcmp (name, devname) == 0)
|
||
break;
|
||
}
|
||
|
||
if (! dev)
|
||
return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "Can't open device");
|
||
|
||
if (dev->atapi)
|
||
disk->total_sectors = 9000000; /* XXX */
|
||
else
|
||
disk->total_sectors = dev->size;
|
||
|
||
disk->id = (unsigned long) dev;
|
||
|
||
disk->has_partitions = !dev->atapi;
|
||
disk->data = dev;
|
||
|
||
return 0;
|
||
}
|
||
|
||
static void
|
||
grub_ata_close (grub_disk_t disk __attribute__((unused)))
|
||
{
|
||
|
||
}
|
||
|
||
struct grub_atapi_read
|
||
{
|
||
grub_uint8_t code;
|
||
grub_uint8_t reserved1;
|
||
grub_uint32_t lba;
|
||
grub_uint32_t length;
|
||
grub_uint8_t reserved2[2];
|
||
} __attribute__((packed));
|
||
|
||
static grub_err_t
|
||
grub_atapi_readsector (struct grub_ata_device *dev,
|
||
char *buf, grub_disk_addr_t sector)
|
||
{
|
||
struct grub_atapi_read readcmd;
|
||
|
||
readcmd.code = 0xA8;
|
||
readcmd.lba = grub_cpu_to_be32 (sector);
|
||
readcmd.length = grub_cpu_to_be32 (1);
|
||
|
||
grub_atapi_packet (dev, (char *) &readcmd);
|
||
grub_ata_wait ();
|
||
grub_ata_pio_read (dev, buf, GRUB_CDROM_SECTOR_SIZE);
|
||
|
||
return 0;
|
||
}
|
||
|
||
static grub_err_t
|
||
grub_ata_read (grub_disk_t disk, grub_disk_addr_t sector,
|
||
grub_size_t size, char *buf)
|
||
{
|
||
struct grub_ata_device *dev = (struct grub_ata_device *) disk->data;
|
||
int cdsector;
|
||
char *sbuf;
|
||
|
||
if (! dev->atapi)
|
||
return grub_ata_readwrite (disk, sector, size, buf, 0);
|
||
|
||
/* ATAPI is being used, so try to read from CDROM using ATAPI. */
|
||
|
||
sbuf = grub_malloc (GRUB_CDROM_SECTOR_SIZE);
|
||
if (! sbuf)
|
||
return grub_errno;
|
||
|
||
/* CDROMs have sectors of 2048 bytes, so chop them into pieces of
|
||
512 bytes. */
|
||
while (size > 0)
|
||
{
|
||
int rsize;
|
||
int offset;
|
||
int max;
|
||
|
||
cdsector = sector >> 2;
|
||
rsize = ((size * GRUB_DISK_SECTOR_SIZE > GRUB_CDROM_SECTOR_SIZE)
|
||
? GRUB_CDROM_SECTOR_SIZE : size * GRUB_DISK_SECTOR_SIZE);
|
||
offset = (sector & 3) * GRUB_DISK_SECTOR_SIZE;
|
||
max = GRUB_CDROM_SECTOR_SIZE - offset;
|
||
rsize = (rsize > max) ? max : rsize;
|
||
|
||
grub_atapi_readsector (dev, sbuf, cdsector);
|
||
grub_memcpy (buf + offset, sbuf, rsize);
|
||
|
||
buf += rsize;
|
||
size -= rsize / GRUB_DISK_SECTOR_SIZE;
|
||
sector += rsize / GRUB_DISK_SECTOR_SIZE;
|
||
}
|
||
|
||
grub_free (sbuf);
|
||
|
||
return 0;
|
||
}
|
||
|
||
static grub_err_t
|
||
grub_ata_write (grub_disk_t disk,
|
||
grub_disk_addr_t sector,
|
||
grub_size_t size,
|
||
const char *buf)
|
||
{
|
||
struct grub_ata_device *dev = (struct grub_ata_device *) disk->data;
|
||
|
||
if (! dev->atapi)
|
||
return grub_ata_readwrite (disk, sector, size, (char *) buf, 1);
|
||
|
||
return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET, "ATAPI write not supported");
|
||
}
|
||
|
||
static struct grub_disk_dev grub_atadisk_dev =
|
||
{
|
||
.name = "ATA",
|
||
.id = GRUB_DISK_DEVICE_ATA_ID,
|
||
.iterate = grub_ata_iterate,
|
||
.open = grub_ata_open,
|
||
.close = grub_ata_close,
|
||
.read = grub_ata_read,
|
||
.write = grub_ata_write,
|
||
.next = 0
|
||
};
|
||
|
||
|
||
|
||
GRUB_MOD_INIT(ata)
|
||
{
|
||
(void) mod; /* To stop warning. */
|
||
|
||
/* To prevent two drivers operating on the same disks. */
|
||
grub_disk_firmware_is_tainted = 1;
|
||
if (grub_disk_firmware_fini)
|
||
{
|
||
grub_disk_firmware_fini ();
|
||
grub_disk_firmware_fini = NULL;
|
||
}
|
||
|
||
/* ATA initialization. */
|
||
grub_ata_initialize ();
|
||
|
||
grub_disk_dev_register (&grub_atadisk_dev);
|
||
}
|
||
|
||
GRUB_MOD_FINI(ata)
|
||
{
|
||
grub_disk_dev_unregister (&grub_atadisk_dev);
|
||
}
|