WIP - ATA devices

2017-03-15 08:57:00 +01:00
parent 4bb9021885
commit 8671007f19
5 changed files with 260 additions and 25 deletions
--- a/kernel/include/ata.h
+++ b/kernel/include/ata.h
@@ -0,0 +1,101 @@
+#pragma once
+#include <stdint.h>
+
+#define ATA_PRIMARY 0x1F0
+#define ATA_SECONDARY 0x170
+#define ATA_MASTER 0x00
+#define ATA_SLAVE  0x10
+
+// Input to controller
+#define ATA_FEATURE(x) (x + 1)
+#define ATA_COUNT(x)   (x + 2)
+#define ATA_LBAL(x)    (x + 3)
+#define ATA_LBAM(x)    (x + 4)
+#define ATA_LBAH(x)    (x + 5)
+#define ATA_DEVICE(x)  (x + 6)
+#define ATA_COMMAND(x) (x + 7)
+#define ATA_CONTROL(x) (x + 0x206)
+
+// Output from controller
+#define ATA_DATA(x) (x + 0)
+#define ATA_ERROR(x)   (x + 1)
+// COUNT
+// LBAL
+// LBAM
+// LBAH
+// DEVICE
+#define ATA_STATUS(x)  (x + 7)
+
+#define ATA_ERR (1<<0)
+#define ATA_DRQ (1<<3)
+#define ATA_SRV (1<<4)
+#define ATA_DF  (1<<5)
+#define ATA_RDY (1<<6)
+#define ATA_BSY (1<<7)
+
+#define ATA_nIEN (1<<1)
+#define ATA_SRST (1<<2)
+
+#define ATA_CMD_IDENTIFY 0xEC
+#define ATA_CMD_IDENTIFY_PACKET 0xA1
+#define ATA_CMD_READ_SECTORS 0x20
+#define ATA_CMD_WRITE_SECTORS 0x30
+#define ATA_CMD_PACKET 0xA0
+
+#define ATAPI_LBA_MAGIC 0xEB1401
+
+typedef struct ata_drive
+{
+  int exists;
+  int bus;
+  int ms;
+  int atapi;
+  struct {
+    uint16_t config;
+    uint16_t unused1[9];
+    char serial[20];
+    uint16_t unused2[3];
+    char firmware[8];
+    char model[40];
+    uint8_t unused3;
+    uint8_t sectors_per_interrupt;
+    uint16_t unused4;
+    uint16_t capabilities[2];
+    uint16_t unused5[2];
+    uint16_t validity;
+    uint16_t unused6[3];
+    uint32_t capacity_sectors;
+    uint16_t sectors_per_command;
+    uint32_t capacity_lba28;
+    uint16_t unused7[38];
+    uint64_t capcity_lba48;
+    uint16_t unused8[152];
+  }__attribute__((packed)) id;
+} ata_drive;
+
+ata_drive drives[4];
+
+typedef struct ata_cmd_st
+{
+  uint16_t bus;
+  union {
+    uint8_t feature;
+    uint8_t error;
+  };
+  uint8_t count;
+  union {
+    uint64_t lba;
+    uint8_t lba_sep[4];
+  };
+  uint8_t device;
+  union {
+    uint8_t command;
+    uint8_t status;
+  };
+  uint8_t wait_status;
+} ata_cmd_t;
+
+int ata_read_block(struct ata_drive *drive, uint64_t lba, void *buffer);
+int ata_write_block(struct ata_drive *drive, uint64_t lba, void *buffer);
+
+void ata_init();