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+//! ATA constants
+
+// Commands
+pub const CMD_READ_SECTORS: u8 = 0x20;
+pub const CMD_WRITE_SECTORS: u8 = 0x30;
+pub const CMD_READ_DMA_EX: u8 = 0x25;
+pub const CMD_WRITE_DMA_EX: u8 = 0x35;
+pub const CMD_IDENTIFY: u8 = 0xEC;
+
+// Status register bits
+pub const STATUS_ERR: u8 = 0x01;
+pub const STATUS_DRQ: u8 = 0x08;
+pub const STATUS_SRV: u8 = 0x10;
+pub const STATUS_DF: u8 = 0x20;
+pub const STATUS_RDY: u8 = 0x40;
+pub const STATUS_BSY: u8 = 0x80;
+
+// Device signatures
+pub const SIG_ATA: u32 = 0x00000101;
+pub const SIG_ATAPI: u32 = 0xEB140101;
+pub const SIG_SEMB: u32 = 0xC33C0101;
+pub const SIG_PM: u32 = 0x96690101;
+
+// Port registers (primary)
+pub const PRIMARY_DATA: u16 = 0x1F0;
+pub const PRIMARY_ERROR: u16 = 0x1F1;
+pub const PRIMARY_SECTOR_COUNT: u16 = 0x1F2;
+pub const PRIMARY_LBA_LOW: u16 = 0x1F3;
+pub const PRIMARY_LBA_MID: u16 = 0x1F4;
+pub const PRIMARY_LBA_HIGH: u16 = 0x1F5;
+pub const PRIMARY_DRIVE_SELECT: u16 = 0x1F6;
+pub const PRIMARY_STATUS: u16 = 0x1F7;
+pub const PRIMARY_COMMAND: u16 = 0x1F7;