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Diffstat (limited to 'include/grub/ata.h')
| -rw-r--r-- | include/grub/ata.h | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/include/grub/ata.h b/include/grub/ata.h new file mode 100644 index 0000000..c8f4e5e --- /dev/null +++ b/include/grub/ata.h @@ -0,0 +1,177 @@ +/* ata.h - ATA disk access. */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2007, 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/>. + */ + +#ifndef GRUB_ATA_HEADER +#define GRUB_ATA_HEADER 1 + +#include <grub/misc.h> +#include <grub/symbol.h> +/* XXX: For now this only works on i386. */ +#include <grub/cpu/io.h> + +typedef enum + { + GRUB_ATA_CHS, + GRUB_ATA_LBA, + GRUB_ATA_LBA48 + } grub_ata_addressing_t; + +#define GRUB_ATA_CH0_PORT1 0x1f0 +#define GRUB_ATA_CH1_PORT1 0x170 + +#define GRUB_ATA_CH0_PORT2 0x3f6 +#define GRUB_ATA_CH1_PORT2 0x376 + +#define GRUB_ATA_REG_DATA 0 +#define GRUB_ATA_REG_ERROR 1 +#define GRUB_ATA_REG_FEATURES 1 +#define GRUB_ATA_REG_SECTORS 2 +#define GRUB_ATAPI_REG_IREASON 2 +#define GRUB_ATA_REG_SECTNUM 3 +#define GRUB_ATA_REG_CYLLSB 4 +#define GRUB_ATA_REG_CYLMSB 5 +#define GRUB_ATA_REG_LBALOW 3 +#define GRUB_ATA_REG_LBAMID 4 +#define GRUB_ATAPI_REG_CNTLOW 4 +#define GRUB_ATA_REG_LBAHIGH 5 +#define GRUB_ATAPI_REG_CNTHIGH 5 +#define GRUB_ATA_REG_DISK 6 +#define GRUB_ATA_REG_CMD 7 +#define GRUB_ATA_REG_STATUS 7 + +#define GRUB_ATA_REG2_CONTROL 0 + +#define GRUB_ATA_STATUS_ERR 0x01 +#define GRUB_ATA_STATUS_INDEX 0x02 +#define GRUB_ATA_STATUS_ECC 0x04 +#define GRUB_ATA_STATUS_DRQ 0x08 +#define GRUB_ATA_STATUS_SEEK 0x10 +#define GRUB_ATA_STATUS_WRERR 0x20 +#define GRUB_ATA_STATUS_READY 0x40 +#define GRUB_ATA_STATUS_BUSY 0x80 + +/* ATAPI interrupt reason values (I/O, D/C bits). */ +#define GRUB_ATAPI_IREASON_MASK 0x3 +#define GRUB_ATAPI_IREASON_DATA_OUT 0x0 +#define GRUB_ATAPI_IREASON_CMD_OUT 0x1 +#define GRUB_ATAPI_IREASON_DATA_IN 0x2 +#define GRUB_ATAPI_IREASON_ERROR 0x3 + +enum grub_ata_commands + { + GRUB_ATA_CMD_CHECK_POWER_MODE = 0xe5, + GRUB_ATA_CMD_IDENTIFY_DEVICE = 0xec, + GRUB_ATA_CMD_IDENTIFY_PACKET_DEVICE = 0xa1, + GRUB_ATA_CMD_IDLE = 0xe3, + GRUB_ATA_CMD_PACKET = 0xa0, + GRUB_ATA_CMD_READ_SECTORS = 0x20, + GRUB_ATA_CMD_READ_SECTORS_EXT = 0x24, + GRUB_ATA_CMD_SECURITY_FREEZE_LOCK = 0xf5, + GRUB_ATA_CMD_SET_FEATURES = 0xef, + GRUB_ATA_CMD_SLEEP = 0xe6, + GRUB_ATA_CMD_SMART = 0xb0, + GRUB_ATA_CMD_STANDBY_IMMEDIATE = 0xe0, + GRUB_ATA_CMD_WRITE_SECTORS = 0x30, + GRUB_ATA_CMD_WRITE_SECTORS_EXT = 0x34, + }; + +enum grub_ata_timeout_milliseconds + { + GRUB_ATA_TOUT_STD = 1000, /* 1s standard timeout. */ + GRUB_ATA_TOUT_DATA = 10000, /* 10s DATA I/O timeout. */ + GRUB_ATA_TOUT_DEV_INIT = 10000, /* Give the device 10s on first try to spinon. */ + }; + +struct grub_ata_device +{ + /* IDE port to use. */ + int port; + + /* IO addresses on which the registers for this device can be + found. */ + grub_port_t ioaddress; + grub_port_t ioaddress2; + + /* Two devices can be connected to a single cable. Use this field + to select device 0 (commonly known as "master") or device 1 + (commonly known as "slave"). */ + int device; + + /* Addressing methods available for accessing this device. If CHS + is only available, use that. Otherwise use LBA, except for the + high sectors. In that case use LBA48. */ + grub_ata_addressing_t addr; + + /* Sector count. */ + grub_uint64_t size; + + /* CHS maximums. */ + grub_uint16_t cylinders; + grub_uint16_t heads; + grub_uint16_t sectors_per_track; + + /* Set to 0 for ATA, set to 1 for ATAPI. */ + int atapi; + + int present; + + struct grub_ata_device *next; +}; + +grub_err_t EXPORT_FUNC(grub_ata_wait_not_busy) (struct grub_ata_device *dev, + int milliseconds); +grub_err_t EXPORT_FUNC(grub_ata_wait_drq) (struct grub_ata_device *dev, + int rw, int milliseconds); +void EXPORT_FUNC(grub_ata_pio_read) (struct grub_ata_device *dev, + char *buf, grub_size_t size); + +static inline void +grub_ata_regset (struct grub_ata_device *dev, int reg, int val) +{ + grub_outb (val, dev->ioaddress + reg); +} + +static inline grub_uint8_t +grub_ata_regget (struct grub_ata_device *dev, int reg) +{ + return grub_inb (dev->ioaddress + reg); +} + +static inline void +grub_ata_regset2 (struct grub_ata_device *dev, int reg, int val) +{ + grub_outb (val, dev->ioaddress2 + reg); +} + +static inline grub_uint8_t +grub_ata_regget2 (struct grub_ata_device *dev, int reg) +{ + return grub_inb (dev->ioaddress2 + reg); +} + +static inline grub_err_t +grub_ata_check_ready (struct grub_ata_device *dev) +{ + if (grub_ata_regget (dev, GRUB_ATA_REG_STATUS) & GRUB_ATA_STATUS_BUSY) + return grub_ata_wait_not_busy (dev, GRUB_ATA_TOUT_STD); + + return GRUB_ERR_NONE; +} + +#endif /* ! GRUB_ATA_HEADER */ |