public static void RemoveCursor()
{
C.outb(0x3D4, 14);
C.outb(0x3D5, 0x07);
C.outb(0x3D4, 15);
C.outb(0x3D5, 0xD0);
}
/* ATA specifies a 400ns delay after drive switching -- often
* * implemented as 4 Alternative Status queries. */
internal static void ATA_SELECT_DELAY(byte bus)
{
portnum = bus;
C.inb(ATA_DCR);
C.inb(ATA_DCR);
C.inb(ATA_DCR);
C.inb(ATA_DCR);
}
public static void UpdateCursor(int X, int Y)
{
int tmp = GetOffset(X, Y);
C.outb(0x3D4, 14);
C.outb(0x3D5, (byte)(tmp >> 8));
C.outb(0x3D4, 15);
C.outb(0x3D5, (byte)tmp);
}
/* Use the ATAPI protocol to read a single sector from the given
* * bus/drive into the buffer using logical block address lba. */
internal static unsafe int atapi_drive_read_sector(UInt32 bus, UInt32 drive, UInt32 lba, byte *buffer)
{
// 0xA8 is READ SECTORS command byte
ushort[] read_cmd = new ushort[12] {
0xA8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
byte status;
int size;
// Tell the scheduler that this process is using the ATA subsystem
// ata_grab(); // WHAT DA HELL IS ATA_GRAB()
// Select drive (only the slave-bit is set)
portnum = (byte)bus;
ushort thePort = (ushort)(drive & (1 << 4));
C.outb(thePort, ATA_DRIVE_SELECT);
ATA_SELECT_DELAY((byte)bus); // 400ns delay
C.outb(0x0, ATA_FEATURES); // PIO mode
C.outb(ATAPI_SECTOR_SIZE & 0xFF, ATA_ADDRESS2);
C.outb(ATAPI_SECTOR_SIZE >> 8, ATA_ADDRESS3);
C.outb(0xA0, ATA_COMMAND); // ATA PACKET command
// while ((status = inb (ATA_COMMAND (bus))) & 0x80)
while (((status = C.inb(ATA_COMMAND)) & 0x80) == 0)
{
;
}
// while (!((status = inb (ATA_COMMAND (bus))) & 0x8) && !(status & 0x1))
while (((status = C.inb(ATA_COMMAND)) & 0x8) != 0 && (status & 0x01) != 0)
{
;
}
// DRQ or ERROR set
if ((byte)(status & 0x1) == 0)
{
size = -1;
goto cleanup;
}
read_cmd[9] = 1; // 1 sector
read_cmd[2] = (byte)((lba >> 0x18) & 0xFF); // most sig. byte of LBA
read_cmd[3] = (byte)((lba >> 0x10) & 0xFF);
read_cmd[4] = (byte)((lba >> 0x08) & 0xFF);
read_cmd[5] = (byte)((lba >> 0x00) & 0xFF); // least sig. byte of LBA
// Send ATAPI/SCSI command
//outw(ATA_DATA, read_cmd);
// WTF? read_cmd is an array!
foreach (ushort ush in read_cmd)
{
C.outw(ATA_DATA, ush);
}
// Wait for IRQ that says the data is ready
//schedule(); // ???
// Read actual size
size = (((int)C.inb(ATA_ADDRESS3)) >> 8) | (int)(C.inb(ATA_ADDRESS2));
/* This code only supports the case where the data transfer
* of one sector is done in one step. */
// WHAT DA HELL IS ASSERT
//ASSERT (size == ATAPI_SECTOR_SIZE);
// Read data
// inw((ushort)ATA_DATA, (ushort*)buffer, (ushort)(size / 2));
/* The controller will send another IRQ even though we've read all
* the data we want. Wait for it -- so it doesn't interfere with
* subsequent operations: */
////////////////////////////////////////////////////////////////
// schedule(); // HAS SOMETHING TO DO WITH IRQ.. xD ////////////
////////////////////////////////////////////////////////////////
/* Wait for BSY and DRQ to clear, indicating Command Finished */
// while ((status = inb (ATA_COMMAND (bus))) & 0x88)
while (((status = C.inb(ATA_COMMAND)) & 0x88) == 0)
{
;
}
cleanup:
/* Exit the ATA subsystem */
// ata_release(); // ATA RELEASE? WTF!!
return(size);
}