Add preliminary ATA PIO driver
diff --git a/include/kernel/dri/ata_pio/ata_pio.h b/include/kernel/dri/ata_pio/ata_pio.h
new file mode 100644
index 0000000..acd7667
--- /dev/null
+++ b/include/kernel/dri/ata_pio/ata_pio.h
@@ -0,0 +1,46 @@
+#pragma once
+
+#include <kint.h>
+
+/**
+ * ATA PIO Driver for Bluejay. This should be replaced by a proper
+ * ATAPI driver later on, but for now this will do. It is going to
+ * be horribly slow by virtue of having to pass all data through
+ * in() and out().
+ */
+
+// status codes
+enum
+{
+ ATA_BSY = 0x80, // Busy
+ ATA_RDY = 0x40, // Ready for command
+ ATA_DRQ = 0x08, // Ready for data
+ ATA_DF = 0x20,
+ ATA_ERR = 0x01, // Error code placed in error register
+};
+
+// IO ports
+enum
+{
+ ATA_PORT_CMD = 0x1f7,
+ ATA_PORT_DATA = 0x1f0,
+ ATA_PORT_DRIVE_SEL = 0x1f6,
+ ATA_PORT_SECTOR_COUNT = 0x1f2,
+ ATA_PORT_LBA_LOW,
+ ATA_PORT_LBA_MID,
+ ATA_PORT_LBA_HIGH,
+};
+
+// Commands
+enum
+{
+ ATA_CMD_READ = 0x20,
+ ATA_CMD_WRITE = 0x30,
+};
+
+void ata_pio_wait_bsy();
+void ata_pio_wait_drq();
+void ata_pio_read_sectors(uchar *buffer, uint lba, uchar num_sectors);
+void ata_pio_write_sectors(uint lba, uchar num_sectors, uchar *buffer);
+
+void test_ata_pio();