Some ground work for TRIM command support for SSDs.

However, this was enough to show that mine doesn't support it, so I'm not investigating further.

src/add-ons/kernel/bus_managers/ata/ATACommands.h

@@ -1,4 +1,5 @@
 /*
+ * Copyright 2012, Adrien Destugues, [email protected].
  * Copyright 2009, Michael Lotz, [email protected].
  * Copyright 2002-2003, Thomas Kurschel.
  *
@@ -42,6 +43,8 @@
 #define ATA_COMMAND_FLUSH_CACHE							0xe7
 #define ATA_COMMAND_FLUSH_CACHE_EXT						0xea
 
+#define ATA_COMMAND_DATA_SET_MANAGEMENT					0x06
+
 #define ATA_COMMAND_MEDIA_EJECT							0xed
 
 #define ATA_COMMAND_IDENTIFY_PACKET_DEVICE				0xa1

src/add-ons/kernel/bus_managers/ata/ATAInfoBlock.h

@@ -338,7 +338,17 @@ typedef struct ata_device_infoblock {
 		word_160_supported						: 1
 	);
 
-	uint16	word_161_175_reserved_compact_flash_assoc[15];
+	uint16	word_161_167_reserved_compact_flash_assoc[7];
+	LBITFIELD2(
+		device_nominal_form_factor				: 4,
+		word_168_bits_4_15_reserved				: 12
+	);
+	LBITFIELD2(
+		data_set_management_support				: 1,
+		word_169_bits_1_15_reserved				: 15
+	);
+	uint16	additional_product_identifier[4];
+	uint16	word_174_175_reserved[2];
 	uint16	current_media_serial_number[30];
 	uint16	word_206_208_reserved[3];