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Annotation of kernel/bsd/dev/ppc/drvPPCATA/AtapiCnt.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
                      7:  * Reserved.  This file contains Original Code and/or Modifications of
                      8:  * Original Code as defined in and that are subject to the Apple Public
                      9:  * Source License Version 1.1 (the "License").  You may not use this file
                     10:  * except in compliance with the License.  Please obtain a copy of the
                     11:  * License at http://www.apple.com/publicsource and read it before using
                     12:  * this file.
                     13:  * 
                     14:  * The Original Code and all software distributed under the License are
                     15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
                     19:  * License for the specific language governing rights and limitations
                     20:  * under the License.
                     21:  * 
                     22:  * @APPLE_LICENSE_HEADER_END@
                     23:  */
                     24: 
                     25: // Copyright 1997 by Apple Computer, Inc., all rights reserved.
                     26: /*
                     27:  * Copyright (c) 1994-1997 NeXT Software, Inc.  All rights reserved. 
                     28:  *
                     29:  * AtapiCnt.h - Interface for ATAPI controller class. 
                     30:  *
                     31:  * HISTORY 
                     32:  * 31-Aug-1994         Rakesh Dubey at NeXT 
                     33:  *     Created.
                     34:  */
                     35: 
                     36: #import <driverkit/scsiTypes.h>
                     37: #import <driverkit/IOSCSIController.h>
                     38: #import "AtapiCntCmds.h"
                     39: 
                     40: /*
                     41:  * We will preallocate command buffers for doing I/O. This avoids a deadlock
                     42:  * situation when we are running very low on memory. Comment out this #define
                     43:  * if this behavior is not desired.
                     44:  */
                     45: #define NO_ATAPI_RUNTIME_MEMORY_ALLOCATION
                     46: 
                     47: /*
                     48:  * Commands to be executed by I/O thread.
                     49:  */
                     50: typedef enum {
                     51:     ATAPI_CNT_IOREQ,                   /* process IdeIoReq_t */
                     52:     ATAPI_CNT_ABORT,                   /* abort pending "needsDisk" I/Os */
                     53:     ATAPI_CNT_THREAD_ABORT,            /* thread abort */
                     54: } atapiCmd_t;
                     55: 
                     56: /*
                     57:  * Command buffer. These are enqueued on one of the I/O queues by exported
                     58:  * methods and dequeued and processed by the I/O thread.
                     59:  */
                     60: typedef  struct {
                     61:     atapiCmd_t command;        /* IOREQ or abort */
                     62:     atapiIoReq_t *atapiIoReq;  /* command block passed to controller */
                     63:     void       *buffer;
                     64:     vm_task_t  client;
                     65:     id         waitLock;       /* NXConditionLock  */
                     66:     sc_status_t        status;
                     67:     queue_chain_t link;
                     68:     queue_chain_t bufLink;
                     69: } atapiBuf_t;
                     70: 
                     71: 
                     72: @interface AtapiController:IOSCSIController
                     73: {
                     74: @private
                     75:     /*
                     76:      * The queues on which all I/Os are enqueued by exported methods. 
                     77:      */
                     78:     queue_head_t       _ioQueueNodisk; /* for all I/O */
                     79: 
                     80: #ifdef NO_ATAPI_RUNTIME_MEMORY_ALLOCATION
                     81:     queue_head_t       _atapiBufQueue;
                     82:     id                 _atapiBufLock;
                     83: #define MAX_NUM_ATAPIBUF               64
                     84:     atapiBuf_t         _atapiBufPool[MAX_NUM_ATAPIBUF];
                     85: #endif NO_ATAPI_RUNTIME_MEMORY_ALLOCATION
                     86: 
                     87:     /*
                     88:      * NXConditionLock - protects the queues; I/O thread sleeps on this. 
                     89:      */
                     90:     id                         _ioQLock;
                     91:     
                     92:     id _ataController;                 /* ATA controller */
                     93: }
                     94: 
                     95: + (BOOL)probe : deviceDescription;
                     96: + (IODeviceStyle)deviceStyle;          /* override IOSCSIController    */
                     97: + (Protocol **)requiredProtocols;
                     98: 
                     99: - (sc_status_t) executeRequest         : (IOSCSIRequest *)scsiReq 
                    100:                        buffer : (void *)buffer 
                    101:                        client : (vm_task_t)client;
                    102:                         
                    103: - (BOOL) maptoAtapiCmd:(atapiIoReq_t *)atapiIoReq      /* map SCSI -> ATAPI */
                    104:                 buffer:(void *)buffer; 
                    105: 
                    106: - (BOOL) emulateSCSICmd:(atapiIoReq_t *)atapiIoReq 
                    107:                 buffer:(void *)buffer;         /* fake these */
                    108: 
                    109: - (sc_status_t)resetSCSIBus;
                    110: 
                    111: - (void)getDMAAlignment:(IODMAAlignment *)alignment;
                    112: 
                    113: - (unsigned) maxTransfer;
                    114: @end
                    115: 
                    116: /*
                    117:  * So that we can use ATAPI naming convention and still use the ATA
                    118:  * registers.
                    119:  */
                    120: #define InterruptReason                sectCnt
                    121: #define byteCountLow           cylLow
                    122: #define byteCountHigh          cylHigh
                    123: #define driveSelect            drHead
                    124: 
                    125: #define ATAPI_NLUNS            1

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