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169 lines
4.7 KiB
C
169 lines
4.7 KiB
C
/* ata.h - ATA disk access. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2007, 2008, 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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#ifndef GRUB_ATA_HEADER
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#define GRUB_ATA_HEADER 1
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#include <grub/misc.h>
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#include <grub/symbol.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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#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_ATAPI_REG_IREASON 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_ATAPI_REG_CNTLOW 4
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#define GRUB_ATA_REG_LBAHIGH 5
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#define GRUB_ATAPI_REG_CNTHIGH 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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/* ATAPI interrupt reason values (I/O, D/C bits). */
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#define GRUB_ATAPI_IREASON_MASK 0x3
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#define GRUB_ATAPI_IREASON_DATA_OUT 0x0
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#define GRUB_ATAPI_IREASON_CMD_OUT 0x1
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#define GRUB_ATAPI_IREASON_DATA_IN 0x2
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#define GRUB_ATAPI_IREASON_ERROR 0x3
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enum grub_ata_commands
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{
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GRUB_ATA_CMD_CHECK_POWER_MODE = 0xe5,
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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_IDLE = 0xe3,
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GRUB_ATA_CMD_PACKET = 0xa0,
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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_SECURITY_FREEZE_LOCK = 0xf5,
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GRUB_ATA_CMD_SET_FEATURES = 0xef,
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GRUB_ATA_CMD_SLEEP = 0xe6,
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GRUB_ATA_CMD_SMART = 0xb0,
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GRUB_ATA_CMD_STANDBY_IMMEDIATE = 0xe0,
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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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};
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enum grub_ata_timeout_milliseconds
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{
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GRUB_ATA_TOUT_STD = 1000, /* 1s standard timeout. */
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GRUB_ATA_TOUT_DATA = 10000 /* 10s DATA I/O timeout. */
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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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grub_port_t ioaddress;
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grub_port_t 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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grub_err_t EXPORT_FUNC(grub_ata_wait_not_busy) (struct grub_ata_device *dev,
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int milliseconds);
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grub_err_t EXPORT_FUNC(grub_ata_wait_drq) (struct grub_ata_device *dev,
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int rw, int milliseconds);
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void EXPORT_FUNC(grub_ata_pio_read) (struct grub_ata_device *dev,
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char *buf, grub_size_t size);
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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 grub_uint8_t
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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 grub_uint8_t
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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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static inline grub_err_t
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grub_ata_check_ready (struct grub_ata_device *dev)
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{
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if (grub_ata_regget (dev, GRUB_ATA_REG_STATUS) & GRUB_ATA_STATUS_BUSY)
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return grub_ata_wait_not_busy (dev, GRUB_ATA_TOUT_STD);
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return GRUB_ERR_NONE;
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}
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#endif /* ! GRUB_ATA_HEADER */
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