Added SCSI hard drive emulation.

Added NCR 58c400-based SCSI adapters :
- Longshine LCS-6821N
- Ranco RT1000B
- Trantor T130B

src/scsi.h

@@ -0,0 +1,103 @@
+struct scsi_bus_t;
+
+typedef struct scsi_device_t
+{
+        void *(*init)(struct scsi_bus_t *bus, int id);
+        void (*close)(void *p);
+        
+        void (*start_command)(void *p);
+        int (*command)(uint8_t *cdb, void *p);
+        
+        uint8_t (*get_status)(void *p);
+        
+        uint8_t (*read)(void *p);
+        void (*write)(uint8_t val, void *p);
+        int (*read_complete)(void *p);
+        int (*write_complete)(void *p);
+} scsi_device_t;
+
+typedef struct scsi_bus_t
+{
+        int state;
+        int new_state;
+        int clear_req;
+        uint32_t bus_in, bus_out;
+        int dev_id;
+
+        int command_pos;
+        uint8_t command[20];
+        
+        scsi_device_t *devices[8];
+        void *device_data[8];
+        
+        int change_state_delay;
+        int new_req_delay;
+} scsi_bus_t;
+
+//int scsi_add_data(uint8_t val);
+//int scsi_get_data();
+void scsi_set_phase(uint8_t phase);
+void scsi_set_irq(uint8_t status);
+
+#define SCSI_TEST_UNIT_READY              0x00
+#define SCSI_REZERO_UNIT                  0x01
+#define SCSI_REQUEST_SENSE                0x03
+#define SCSI_FORMAT                       0x04
+#define SCSI_READ_6                       0x08
+#define SCSI_WRITE_6                      0x0a
+#define SCSI_SEEK_6                       0x0b
+#define SCSI_INQUIRY                      0x12
+#define SCSI_MODE_SELECT_6                0x15
+#define SCSI_MODE_SENSE_6                 0x1a
+#define SCSI_START_STOP_UNIT              0x1b
+#define SCSI_PREVENT_ALLOW_MEDIUM_REMOVAL 0x1e
+#define SCSI_READ_CAPACITY_10             0x25
+#define SCSI_READ_10                      0x28
+#define SCSI_WRITE_10                     0x2a
+#define SCSI_SEEK_10                      0x2b
+#define SCSI_VERIFY_10                    0x2f
+#define SCSI_READ_BUFFER                  0x3c
+
+#define SCSI_RESERVE                      0x16
+#define SCSI_RELEASE                      0x17
+#define SEND_DIAGNOSTIC                   0x1d
+
+#define STATUS_GOOD            0x00
+#define STATUS_CHECK_CONDITION 0x02
+
+#define MSG_COMMAND_COMPLETE 0x00
+
+#define BUS_DBP 0x01
+#define BUS_SEL 0x02
+#define BUS_IO  0x04
+#define BUS_CD  0x08
+#define BUS_MSG 0x10
+#define BUS_REQ 0x20
+#define BUS_BSY 0x40
+#define BUS_RST 0x80
+#define BUS_ACK 0x200
+#define BUS_ATN 0x200
+#define BUS_ARB 0x8000
+#define BUS_SETDATA(val) ((uint32_t)val << 16)
+#define BUS_GETDATA(val) ((val >> 16) & 0xff)
+#define BUS_DATAMASK 0xff0000
+
+#define BUS_IDLE (1 << 31)
+
+int scsi_bus_update(scsi_bus_t *bus, int bus_assert);
+int scsi_bus_read(scsi_bus_t *bus);
+int scsi_bus_match(scsi_bus_t *bus, int bus_assert);
+void scsi_bus_kick(scsi_bus_t *bus);
+void scsi_bus_init(scsi_bus_t *bus);
+void scsi_bus_close(scsi_bus_t *bus);
+
+#define KEY_ILLEGAL_REQ 5
+
+#define ASC_INVALID_LUN 0x25
+
+#define SCSI_PHASE_DATA_OUT    0
+#define SCSI_PHASE_DATA_IN     BUS_IO
+#define SCSI_PHASE_COMMAND     BUS_CD
+#define SCSI_PHASE_STATUS      (BUS_CD | BUS_IO)
+#define SCSI_PHASE_MESSAGE_OUT (BUS_MSG | BUS_CD)
+#define SCSI_PHASE_MESSAGE_IN  (BUS_MSG | BUS_CD | BUS_IO)