c07ec030a7
Implement PIO-mode IDE driver that scans primary and secondary channels for ATA hard drives and ATAPI CD/DVD drives using IDENTIFY commands. Features: - Scans 4 possible devices (2 channels x 2 drives each) - ATA IDENTIFY DEVICE for hard drives - ATAPI IDENTIFY PACKET DEVICE for CD/DVD drives - PIO-mode 28-bit LBA sector read/write for ATA drives - Model string extraction and sector count parsing - Registers as kernel driver via REGISTER_DRIVER macro - Registers devices with devicefs: ATA → hdd class, ATAPI → cd class - Added inw/outw to port_io.h for 16-bit I/O Tested: QEMU detects hdd1 (QEMU HARDDISK) and cd1 (QEMU DVD-ROM).
89 lines
2.9 KiB
C
89 lines
2.9 KiB
C
/**
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* @file ide.h
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* @brief IDE/ATA disk driver.
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*
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* Enumerates IDE devices on the primary and secondary channels, identifies
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* ATA hard drives and ATAPI CD-ROMs, and registers them with the devicefs
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* subsystem as block devices (hddN / cdN).
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*/
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#ifndef IDE_H
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#define IDE_H
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#include <stdint.h>
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/** Maximum number of IDE devices (2 channels × 2 drives). */
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#define IDE_MAX_DEVICES 4
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/** IDE channel I/O port bases. */
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#define IDE_PRIMARY_IO 0x1F0
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#define IDE_PRIMARY_CTRL 0x3F6
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#define IDE_SECONDARY_IO 0x170
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#define IDE_SECONDARY_CTRL 0x376
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/** IDE register offsets from I/O base. */
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#define IDE_REG_DATA 0x00
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#define IDE_REG_ERROR 0x01
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#define IDE_REG_FEATURES 0x01
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#define IDE_REG_SECCOUNT 0x02
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#define IDE_REG_LBA_LO 0x03
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#define IDE_REG_LBA_MID 0x04
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#define IDE_REG_LBA_HI 0x05
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#define IDE_REG_DRIVE_HEAD 0x06
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#define IDE_REG_STATUS 0x07
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#define IDE_REG_COMMAND 0x07
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/** IDE status register bits. */
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#define IDE_STATUS_ERR 0x01 /**< Error occurred. */
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#define IDE_STATUS_DRQ 0x08 /**< Data request ready. */
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#define IDE_STATUS_SRV 0x10 /**< Overlapped mode service request. */
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#define IDE_STATUS_DF 0x20 /**< Drive fault. */
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#define IDE_STATUS_DRDY 0x40 /**< Drive ready. */
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#define IDE_STATUS_BSY 0x80 /**< Drive busy. */
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/** IDE commands. */
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#define IDE_CMD_IDENTIFY 0xEC /**< ATA IDENTIFY DEVICE. */
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#define IDE_CMD_IDENTIFY_PKT 0xA1 /**< ATAPI IDENTIFY PACKET DEVICE. */
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#define IDE_CMD_READ_PIO 0x20 /**< Read sectors (PIO, 28-bit LBA). */
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#define IDE_CMD_WRITE_PIO 0x30 /**< Write sectors (PIO, 28-bit LBA). */
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/** IDE device types. */
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#define IDE_TYPE_NONE 0 /**< No device present. */
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#define IDE_TYPE_ATA 1 /**< ATA hard disk. */
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#define IDE_TYPE_ATAPI 2 /**< ATAPI CD/DVD drive. */
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/**
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* IDE device descriptor.
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*/
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typedef struct ide_device {
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uint8_t present; /**< 1 if device is present. */
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uint8_t type; /**< IDE_TYPE_ATA or IDE_TYPE_ATAPI. */
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uint8_t channel; /**< 0 = primary, 1 = secondary. */
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uint8_t drive; /**< 0 = master, 1 = slave. */
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uint16_t io_base; /**< I/O base port for this channel. */
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uint16_t ctrl_base; /**< Control port for this channel. */
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uint32_t sector_count; /**< Total sectors (28-bit LBA max). */
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uint32_t sector_size; /**< Sector size in bytes (usually 512). */
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char model[41]; /**< Model string from IDENTIFY. */
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} ide_device_t;
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/**
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* Initialize the IDE driver.
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*
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* Scans primary and secondary channels for ATA/ATAPI devices,
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* reads their IDENTIFY data, and registers them with devicefs.
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*
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* @return Number of devices found.
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*/
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int ide_init(void);
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/**
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* Get an IDE device by index (0–3).
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*
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* @param index Device index.
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* @return Pointer to the device descriptor, or NULL if invalid/not present.
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*/
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ide_device_t *ide_get_device(int index);
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#endif /* IDE_H */
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