Added ext2 filesystem

1 files changed, 119 insertions, 0 deletions

diff --git a/src/kernel/fs/ata.h b/src/kernel/fs/ata.h
new file mode 100644
index 0000000..049f2bf
--- /dev/null
+++ b/src/kernel/fs/ata.h
@@ -0,0 +1,119 @@
+#ifndef ATA_DRIVER_H
+#define ATA_DRIVER_H
+
+#include <kernel/fs/vfs/vfs.h>
+#include <kernel/memory/paging.h>
+#include <kernel/interrupts/interrupts.h>
+
+typedef struct prdt {
+	uint32_t buffer_phys;
+	uint16_t transfer_size;
+	uint16_t mark_end;
+} __attribute__((packed)) prdt_t;
+
+typedef struct ata_dev {
+	uint16_t data;
+	uint16_t error;
+	uint16_t sector_count;
+
+	union {
+		uint16_t sector_num;
+		uint16_t lba_lo;
+	};
+	union {
+		uint16_t cylinder_low;
+		uint16_t lba_mid;
+	};
+	union {
+		uint16_t cylinder_high;
+		uint16_t lba_high;
+	};
+	union {
+		uint16_t drive;
+		uint16_t head;
+	};
+	union {
+		uint16_t command;
+		uint16_t status;
+	};
+	union {
+		uint16_t control;
+		uint16_t alt_status;
+	};
+
+	int slave;
+	uint32_t bar4;
+	uint32_t BMR_COMMAND;
+	uint32_t BMR_prdt;
+	uint32_t BMR_STATUS;
+
+	prdt_t *prdt;
+	uint8_t *prdt_phys;
+
+	uint8_t *mem_buffer;
+	uint8_t *mem_buffer_phys;
+
+	char mountpoint[32];
+} __attribute__((packed)) ata_dev_t;
+
+// ATA PCI info
+#define ATA_VENDOR_ID 0x8086
+#define ATA_DEVICE_ID 0x7010
+
+// Control reg
+#define CONTROL_STOP_INTERRUPT 0x2
+#define CONTROL_SOFTWARE_RESET 0x4
+#define CONTROL_HIGH_ORDER_BYTE 0x80
+#define CONTROL_ZERO 0x00
+
+// Command reg
+#define COMMAND_IDENTIFY 0xEC
+#define COMMAND_DMA_READ 0xC8
+#define ATA_CMD_READ_PIO 0x20
+
+// Status reg
+#define STATUS_ERR 0x0
+#define STATUS_DRQ 0x8
+#define STATUS_SRV 0x10
+#define STATUS_DF 0x20
+#define STATUS_RDY 0x40
+#define STATUS_BSY 0x80
+
+// Bus Master Reg Command
+#define BMR_COMMAND_DMA_START 0x1
+#define BMR_COMMAND_DMA_STOP 0x0
+#define BMR_COMMAND_READ 0x8
+#define BMR_STATUS_INT 0x4
+#define BMR_STATUS_ERR 0x2
+
+// Prdt
+#define SECTOR_SIZE 512
+#define MARK_END 0x8000
+
+void io_wait(ata_dev_t *dev);
+
+void software_reset(ata_dev_t *dev);
+
+void ata_handler(struct regs *reg);
+
+void ata_open(vfs_node_t *node, uint32_t flags);
+
+void ata_close(vfs_node_t *node);
+
+uint32_t ata_read(vfs_node_t *node, uint32_t offset, uint32_t size, char *buf);
+
+uint32_t ata_write(vfs_node_t *node, uint32_t offset, uint32_t size, char *buf);
+
+void ata_write_sector(ata_dev_t *dev, uint32_t lba, char *buf);
+
+char *ata_read_sector(ata_dev_t *dev, uint32_t lba);
+
+vfs_node_t *create_ata_device(ata_dev_t *dev);
+
+void ata_device_init(ata_dev_t *dev, int primary);
+
+void ata_device_detect(ata_dev_t *dev, int primary);
+
+void ata_init();
+
+#endif